Add link to hmcl documentation page

重构

HMCL/build.gradle

@@ -20,7 +20,7 @@ import org.tukaani.xz.XZOutputStream
 def buildnumber = System.getenv("BUILD_NUMBER") ?: "SNAPSHOT"
 if (System.getenv("BUILD_NUMBER") != null && System.getenv("BUILD_NUMBER_OFFSET") != null)
     buildnumber = (Integer.parseInt(System.getenv("BUILD_NUMBER")) - Integer.parseInt(System.getenv("BUILD_NUMBER_OFFSET"))).toString()
-def versionroot = System.getenv("VERSION_ROOT") ?: "3.1"
+def versionroot = System.getenv("VERSION_ROOT") ?: "3.2"
 version = versionroot + '.' + buildnumber
 
 dependencies {

HMCL/src/main/java/org/jackhuang/hmcl/Launcher.java

@@ -21,12 +21,14 @@ import com.jfoenix.concurrency.JFXUtilities;
 import javafx.application.Application;
 import javafx.application.Platform;
 import javafx.stage.Stage;
+import org.jackhuang.hmcl.setting.ConfigHolder;
 import org.jackhuang.hmcl.task.Schedulers;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.upgrade.UpdateChecker;
 import org.jackhuang.hmcl.util.*;
 
 import java.io.File;
+import java.io.IOException;
 import java.lang.management.ManagementFactory;
 import java.net.URISyntaxException;
 import java.net.URL;
@@ -37,6 +39,7 @@ import java.util.List;
 import java.util.concurrent.TimeUnit;
 
 import static org.jackhuang.hmcl.util.Logging.LOG;
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
 public final class Launcher extends Application {
 
@@ -44,6 +47,12 @@ public final class Launcher extends Application {
     public void start(Stage primaryStage) {
         Thread.currentThread().setUncaughtExceptionHandler(CRASH_REPORTER);
 
+        try {
+            ConfigHolder.init();
+        } catch (IOException e) {
+            Main.showErrorAndExit(i18n("fatal.config_loading_failure", Paths.get("").toAbsolutePath().normalize()));
+        }
+
         try {
             // When launcher visibility is set to "hide and reopen" without Platform.implicitExit = false,
             // Stage.show() cannot work again because JavaFX Toolkit have already shut down.

HMCL/src/main/java/org/jackhuang/hmcl/Main.java

@@ -49,12 +49,6 @@ public final class Main {
             return;
         }
 
-        try {
-            ConfigHolder.init();
-        } catch (IOException e) {
-            showErrorAndExit(i18n("fatal.config_loading_failure", Paths.get("").toAbsolutePath().normalize()));
-        }
-
         Launcher.main(args);
     }
 
@@ -100,7 +94,7 @@ public final class Main {
     /**
      * Indicates that a fatal error has occurred, and that the application cannot start.
      */
-    private static void showErrorAndExit(String message) {
+    static void showErrorAndExit(String message) {
         System.err.println(message);
         System.err.println("A fatal error has occurred, forcibly exiting.");
         JOptionPane.showMessageDialog(null, message, "Error", JOptionPane.ERROR_MESSAGE);
@@ -110,7 +104,7 @@ public final class Main {
     /**
      * Indicates that potential issues have been detected, and that the application may not function properly (but it can still run).
      */
-    private static void showWarningAndContinue(String message) {
+    static void showWarningAndContinue(String message) {
         System.err.println(message);
         System.err.println("Potential issues have been detected.");
         JOptionPane.showMessageDialog(null, message, "Warning", JOptionPane.WARNING_MESSAGE);

HMCL/src/main/java/org/jackhuang/hmcl/Metadata.java

@@ -31,5 +31,6 @@ public final class Metadata {
     
     public static final String UPDATE_URL = System.getProperty("hmcl.update_source.override", "https://hmcl.huangyuhui.net/api/update_link");
     public static final String CONTACT_URL = "https://hmcl.huangyuhui.net/contact";
+    public static final String HELP_URL = "https://hmcl.huangyuhui.net/help";
     public static final String PUBLISH_URL = "http://www.mcbbs.net/thread-142335-1-1.html";
 }

HMCL/src/main/java/org/jackhuang/hmcl/game/HMCLGameRepository.java

@@ -164,6 +164,27 @@ public class HMCLGameRepository extends DefaultGameRepository {
         }
     }
 
+    /**
+     * Make version use self version settings instead of the global one.
+     * @param id the version id.
+     * @return specialized version setting, null if given version does not exist.
+     */
+    public VersionSetting specializeVersionSetting(String id) {
+        VersionSetting vs = getVersionSetting(id);
+        if (vs == null)
+            vs = createVersionSetting(id);
+        if (vs == null)
+            return null;
+        vs.setUsesGlobal(false);
+        return vs;
+    }
+
+    public void globalizeVersionSetting(String id) {
+        VersionSetting vs = getVersionSetting(id);
+        if (vs != null)
+            vs.setUsesGlobal(true);
+    }
+
     public boolean forbidsVersion(String id) {
         return FORBIDDEN.contains(id);
     }

HMCL/src/main/java/org/jackhuang/hmcl/game/LauncherHelper.java

@@ -32,7 +32,6 @@ import org.jackhuang.hmcl.mod.CurseCompletionTask;
 import org.jackhuang.hmcl.mod.ModpackConfiguration;
 import org.jackhuang.hmcl.setting.LauncherVisibility;
 import org.jackhuang.hmcl.setting.Profile;
-import org.jackhuang.hmcl.setting.Settings;
 import org.jackhuang.hmcl.setting.VersionSetting;
 import org.jackhuang.hmcl.task.*;
 import org.jackhuang.hmcl.ui.Controllers;
@@ -50,6 +49,7 @@ import java.util.concurrent.ConcurrentLinkedQueue;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.atomic.AtomicInteger;
 
+import static org.jackhuang.hmcl.setting.ConfigHolder.config;
 import static org.jackhuang.hmcl.util.Lang.mapOf;
 import static org.jackhuang.hmcl.util.Pair.pair;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
@@ -443,7 +443,7 @@ public final class LauncherHelper {
                 System.out.print(log);
 
             logs.add(pair(log, level));
-            if (logs.size() > Settings.instance().getLogLines())
+            if (logs.size() > config().getLogLines())
                 logs.removeFirst();
 
             if (setting.isShowLogs()) {

HMCL/src/main/java/org/jackhuang/hmcl/game/ModpackHelper.java

@@ -87,9 +87,10 @@ public final class ModpackHelper {
 
         FinalizedCallback finalizeTask = (variables, isDependentsSucceeded) -> {
             if (isDependentsSucceeded) {
-                profile.getRepository().refreshVersions();
-                VersionSetting vs = profile.specializeVersionSetting(name);
-                profile.getRepository().undoMark(name);
+                HMCLGameRepository repository = profile.getRepository();
+                repository.refreshVersions();
+                VersionSetting vs = repository.specializeVersionSetting(name);
+                repository.undoMark(name);
                 if (vs != null)
                     vs.setGameDirType(EnumGameDirectory.VERSION_FOLDER);
             }

HMCL/src/main/java/org/jackhuang/hmcl/game/MultiMCInstallVersionSettingTask.java

@@ -44,7 +44,7 @@ public final class MultiMCInstallVersionSettingTask extends Task {
 
     @Override
     public void execute() {
-        VersionSetting vs = Objects.requireNonNull(profile.specializeVersionSetting(version));
+        VersionSetting vs = Objects.requireNonNull(profile.getRepository().specializeVersionSetting(version));
         ModpackHelper.toVersionSetting(manifest, vs);
     }
 }

HMCL/src/main/java/org/jackhuang/hmcl/setting/Accounts.java

@@ -59,7 +59,7 @@ public final class Accounts {
     public static final OfflineAccountFactory FACTORY_OFFLINE = OfflineAccountFactory.INSTANCE;
     public static final YggdrasilAccountFactory FACTORY_YGGDRASIL = new YggdrasilAccountFactory(MojangYggdrasilProvider.INSTANCE);
     public static final AuthlibInjectorAccountFactory FACTORY_AUTHLIB_INJECTOR = new AuthlibInjectorAccountFactory(
-            new AuthlibInjectorDownloader(Launcher.HMCL_DIRECTORY.toPath(), () -> Settings.instance().getDownloadProvider())::getArtifactInfo,
+            new AuthlibInjectorDownloader(Launcher.HMCL_DIRECTORY.toPath(), DownloadProviders::getDownloadProvider)::getArtifactInfo,
             Accounts::getOrCreateAuthlibInjectorServer);
 
     private static final String TYPE_OFFLINE = "offline";

HMCL/src/main/java/org/jackhuang/hmcl/setting/Config.java

@@ -115,8 +115,8 @@ public final class Config implements Cloneable, Observable {
     @SerializedName("localization")
     private ObjectProperty<SupportedLocale> localization = new SimpleObjectProperty<>(Locales.DEFAULT);
 
-    @SerializedName("downloadtype")
-    private IntegerProperty downloadType = new SimpleIntegerProperty(1);
+    @SerializedName("downloadType")
+    private StringProperty downloadType = new SimpleStringProperty("bmclapi");
 
     @SerializedName("configurations")
     private ObservableMap<String, Profile> configurations = FXCollections.observableMap(new TreeMap<>());
@@ -359,15 +359,15 @@ public final class Config implements Cloneable, Observable {
         return localization;
     }
 
-    public int getDownloadType() {
+    public String getDownloadType() {
         return downloadType.get();
     }
 
-    public void setDownloadType(int downloadType) {
+    public void setDownloadType(String downloadType) {
         this.downloadType.set(downloadType);
     }
 
-    public IntegerProperty downloadTypeProperty() {
+    public StringProperty downloadTypeProperty() {
         return downloadType;
     }
 

HMCL/src/main/java/org/jackhuang/hmcl/setting/ConfigUpgrader.java

@@ -86,5 +86,17 @@ final class ConfigUpgrader {
             deserialized.setHasProxy(StringUtils.isNotBlank(deserialized.getProxyHost()));
         if (!rawJson.containsKey("hasProxyAuth"))
             deserialized.setHasProxyAuth(StringUtils.isNotBlank(deserialized.getProxyUser()));
+
+        if (!rawJson.containsKey("downloadType")) {
+            tryCast(rawJson.get("downloadtype"), Number.class)
+                    .map(Number::intValue)
+                    .ifPresent(id -> {
+                        if (id == 0) {
+                            deserialized.setDownloadType("mojang");
+                        } else if (id == 1) {
+                            deserialized.setDownloadType("bmclapi");
+                        }
+                    });
+        }
     }
 }

HMCL/src/main/java/org/jackhuang/hmcl/setting/DownloadProviders.java

@@ -17,20 +17,44 @@
  */
 package org.jackhuang.hmcl.setting;
 
+import static org.jackhuang.hmcl.setting.ConfigHolder.config;
+import static org.jackhuang.hmcl.util.Lang.mapOf;
+import static org.jackhuang.hmcl.util.Pair.pair;
+
+import java.util.Map;
+import java.util.Optional;
+
 import org.jackhuang.hmcl.download.BMCLAPIDownloadProvider;
-import org.jackhuang.hmcl.download.CurseCDNDownloadProvider;
 import org.jackhuang.hmcl.download.DownloadProvider;
 import org.jackhuang.hmcl.download.MojangDownloadProvider;
-import org.jackhuang.hmcl.util.Lang;
 
-import java.util.List;
+import javafx.beans.binding.Bindings;
+import javafx.beans.binding.ObjectBinding;
+import javafx.beans.value.ObservableObjectValue;
 
 public final class DownloadProviders {
     private DownloadProviders() {}
 
-    public static final List<DownloadProvider> DOWNLOAD_PROVIDERS = Lang.immutableListOf(new MojangDownloadProvider(), BMCLAPIDownloadProvider.INSTANCE, CurseCDNDownloadProvider.INSTANCE);
+    public static final Map<String, DownloadProvider> providersById = mapOf(
+            pair("mojang", new MojangDownloadProvider()),
+            pair("bmclapi", new BMCLAPIDownloadProvider()));
 
-    public static DownloadProvider getDownloadProvider(int index) {
-        return Lang.get(DOWNLOAD_PROVIDERS, index).orElse(DOWNLOAD_PROVIDERS.get(0));
+    public static final String DEFAULT_PROVIDER_ID = "bmclapi";
+
+    private static ObjectBinding<DownloadProvider> downloadProviderProperty;
+
+    static void init() {
+        downloadProviderProperty = Bindings.createObjectBinding(
+                () -> Optional.ofNullable(providersById.get(config().getDownloadType()))
+                        .orElse(providersById.get(DEFAULT_PROVIDER_ID)),
+                config().downloadTypeProperty());
+    }
+
+    public static DownloadProvider getDownloadProvider() {
+        return downloadProviderProperty.get();
+    }
+
+    public static ObservableObjectValue<DownloadProvider> downloadProviderProperty() {
+        return downloadProviderProperty;
     }
 }

HMCL/src/main/java/org/jackhuang/hmcl/setting/Profile.java

@@ -18,6 +18,7 @@
 package org.jackhuang.hmcl.setting;
 
 import com.google.gson.*;
+import javafx.application.Platform;
 import javafx.beans.InvalidationListener;
 import javafx.beans.Observable;
 import javafx.beans.property.*;
@@ -28,7 +29,7 @@ import org.jackhuang.hmcl.game.HMCLCacheRepository;
 import org.jackhuang.hmcl.game.HMCLGameRepository;
 import org.jackhuang.hmcl.game.Version;
 import org.jackhuang.hmcl.mod.ModManager;
-import org.jackhuang.hmcl.ui.WeakListenerHelper;
+import org.jackhuang.hmcl.ui.WeakListenerHolder;
 import org.jackhuang.hmcl.util.*;
 
 import java.io.File;
@@ -42,7 +43,7 @@ import static org.jackhuang.hmcl.ui.FXUtils.onInvalidating;
  * @author huangyuhui
  */
 public final class Profile implements Observable {
-    private final WeakListenerHelper helper = new WeakListenerHelper();
+    private final WeakListenerHolder listenerHolder = new WeakListenerHolder();
     private final HMCLGameRepository repository;
     private final ModManager modManager;
 
@@ -135,7 +136,7 @@ public final class Profile implements Observable {
 
         gameDir.addListener((a, b, newValue) -> repository.changeDirectory(newValue));
         this.selectedVersion.addListener(o -> checkSelectedVersion());
-        helper.add(EventBus.EVENT_BUS.channel(RefreshedVersionsEvent.class).registerWeak(event -> checkSelectedVersion()));
+        listenerHolder.add(EventBus.EVENT_BUS.channel(RefreshedVersionsEvent.class).registerWeak(event -> checkSelectedVersion()));
 
         addPropertyChangedListener(onInvalidating(this::invalidate));
     }
@@ -147,7 +148,7 @@ public final class Profile implements Observable {
             Optional<String> version = repository.getVersions().stream().findFirst().map(Version::getId);
             if (version.isPresent())
                 selectedVersion.setValue(version.get());
-            else if (StringUtils.isNotBlank(newValue))
+            else if (newValue != null)
                 selectedVersion.setValue(null);
         }
     }
@@ -161,7 +162,7 @@ public final class Profile implements Observable {
     }
 
     public DefaultDependencyManager getDependency() {
-        return new DefaultDependencyManager(repository, Settings.instance().getDownloadProvider(), HMCLCacheRepository.REPOSITORY);
+        return new DefaultDependencyManager(repository, DownloadProviders.getDownloadProvider(), HMCLCacheRepository.REPOSITORY);
     }
 
     public VersionSetting getVersionSetting(String id) {
@@ -174,32 +175,6 @@ public final class Profile implements Observable {
             return vs;
     }
 
-    public boolean isVersionGlobal(String id) {
-        VersionSetting vs = repository.getVersionSetting(id);
-        return vs == null || vs.isUsesGlobal();
-    }
-
-    /**
-     * Make version use self version settings instead of the global one.
-     * @param id the version id.
-     * @return specialized version setting, null if given version does not exist.
-     */
-    public VersionSetting specializeVersionSetting(String id) {
-        VersionSetting vs = repository.getVersionSetting(id);
-        if (vs == null)
-            vs = repository.createVersionSetting(id);
-        if (vs == null)
-            return null;
-        vs.setUsesGlobal(false);
-        return vs;
-    }
-
-    public void globalizeVersionSetting(String id) {
-        VersionSetting vs = repository.getVersionSetting(id);
-        if (vs != null)
-            vs.setUsesGlobal(true);
-    }
-
     @Override
     public String toString() {
         return new ToStringBuilder(this)
@@ -230,8 +205,8 @@ public final class Profile implements Observable {
         observableHelper.removeListener(listener);
     }
 
-    protected void invalidate() {
-        observableHelper.invalidate();
+    private void invalidate() {
+        Platform.runLater(observableHelper::invalidate);
     }
 
     public static final class Serializer implements JsonSerializer<Profile>, JsonDeserializer<Profile> {

HMCL/src/main/java/org/jackhuang/hmcl/setting/Profiles.java

@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hmcl.setting;
 
+import javafx.application.Platform;
 import javafx.beans.Observable;
 import javafx.beans.property.ObjectProperty;
 import javafx.beans.property.ReadOnlyListProperty;
@@ -87,7 +88,7 @@ public final class Profiles {
         if (profiles.isEmpty()) {
             Profile current = new Profile(Profiles.DEFAULT_PROFILE, new File(".minecraft"), new VersionSetting(), null, true);
             Profile home = new Profile(Profiles.HOME_PROFILE, Launcher.MINECRAFT_DIRECTORY);
-            profiles.addAll(current, home);
+            Platform.runLater(() -> profiles.addAll(current, home));
         }
     }
 

HMCL/src/main/java/org/jackhuang/hmcl/setting/ProxyManager.java

@@ -35,20 +35,7 @@ public final class ProxyManager {
     private ProxyManager() {
     }
 
-    private static ObjectBinding<Proxy> proxyProperty = Bindings.createObjectBinding(
-            () -> {
-                String host = config().getProxyHost();
-                Integer port = Lang.toIntOrNull(config().getProxyPort());
-                if (!config().hasProxy() || StringUtils.isBlank(host) || port == null || config().getProxyType() == Proxy.Type.DIRECT) {
-                    return Proxy.NO_PROXY;
-                } else {
-                    return new Proxy(config().getProxyType(), new InetSocketAddress(host, port));
-                }
-            },
-            config().proxyTypeProperty(),
-            config().proxyHostProperty(),
-            config().proxyPortProperty(),
-            config().hasProxyProperty());
+    private static ObjectBinding<Proxy> proxyProperty;
 
     public static Proxy getProxy() {
         return proxyProperty.get();
@@ -59,12 +46,25 @@ public final class ProxyManager {
     }
 
     static void init() {
-        proxyProperty.addListener(observable -> updateSystemProxy());
+        proxyProperty = Bindings.createObjectBinding(
+                () -> {
+                    String host = config().getProxyHost();
+                    Integer port = Lang.toIntOrNull(config().getProxyPort());
+                    if (!config().hasProxy() || StringUtils.isBlank(host) || port == null || config().getProxyType() == Proxy.Type.DIRECT) {
+                        return Proxy.NO_PROXY;
+                    } else {
+                        return new Proxy(config().getProxyType(), new InetSocketAddress(host, port));
+                    }
+                },
+                config().proxyTypeProperty(),
+                config().proxyHostProperty(),
+                config().proxyPortProperty(),
+                config().hasProxyProperty());
 
+        proxyProperty.addListener(any -> updateSystemProxy());
         updateSystemProxy();
 
         Authenticator.setDefault(new Authenticator() {
-
             @Override
             protected PasswordAuthentication getPasswordAuthentication() {
                 if (config().hasProxyAuth()) {

HMCL/src/main/java/org/jackhuang/hmcl/setting/Settings.java

@@ -19,7 +19,6 @@ package org.jackhuang.hmcl.setting;
 
 import javafx.scene.text.Font;
 import org.jackhuang.hmcl.Launcher;
-import org.jackhuang.hmcl.download.DownloadProvider;
 import org.jackhuang.hmcl.game.HMCLCacheRepository;
 import org.jackhuang.hmcl.util.CacheRepository;
 
@@ -44,6 +43,7 @@ public class Settings {
     }
 
     private Settings() {
+        DownloadProviders.init();
         ProxyManager.init();
         Accounts.init();
         Profiles.init();
@@ -61,14 +61,6 @@ public class Settings {
         config().setFontSize(font.getSize());
     }
 
-    public int getLogLines() {
-        return Math.max(config().getLogLines(), 100);
-    }
-
-    public void setLogLines(int logLines) {
-        config().setLogLines(logLines);
-    }
-
     public static String getDefaultCommonDirectory() {
         return Launcher.MINECRAFT_DIRECTORY.getAbsolutePath();
     }
@@ -83,19 +75,4 @@ public class Settings {
                 return null;
         }
     }
-
-    /****************************************
-     *        DOWNLOAD PROVIDERS            *
-     ****************************************/
-
-    public DownloadProvider getDownloadProvider() {
-        return DownloadProviders.getDownloadProvider(config().getDownloadType());
-    }
-
-    public void setDownloadProvider(DownloadProvider downloadProvider) {
-        int index = DownloadProviders.DOWNLOAD_PROVIDERS.indexOf(downloadProvider);
-        if (index == -1)
-            throw new IllegalArgumentException("Unknown download provider: " + downloadProvider);
-        config().setDownloadType(index);
-    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/FXUtils.java

@@ -17,6 +17,7 @@
  */
 package org.jackhuang.hmcl.ui;
 
+import com.jfoenix.concurrency.JFXUtilities;
 import com.jfoenix.controls.*;
 import javafx.animation.Animation;
 import javafx.animation.Interpolator;
@@ -55,6 +56,7 @@ import java.util.function.Function;
 import java.util.function.Supplier;
 import java.util.logging.Level;
 
+import static org.jackhuang.hmcl.util.Lang.thread;
 import static org.jackhuang.hmcl.util.Lang.tryCast;
 
 public final class FXUtils {
@@ -209,27 +211,29 @@ public final class FXUtils {
     }
 
     public static void installTooltip(Node node, double openDelay, double visibleDelay, double closeDelay, Tooltip tooltip) {
-        try {
-            // Java 8
-            Class<?> behaviorClass = Class.forName("javafx.scene.control.Tooltip$TooltipBehavior");
-            Constructor<?> behaviorConstructor = behaviorClass.getDeclaredConstructor(Duration.class, Duration.class, Duration.class, boolean.class);
-            behaviorConstructor.setAccessible(true);
-            Object behavior = behaviorConstructor.newInstance(new Duration(openDelay), new Duration(visibleDelay), new Duration(closeDelay), false);
-            Method installMethod = behaviorClass.getDeclaredMethod("install", Node.class, Tooltip.class);
-            installMethod.setAccessible(true);
-            installMethod.invoke(behavior, node, tooltip);
-        } catch (ReflectiveOperationException e) {
+        JFXUtilities.runInFX(() -> {
             try {
-                // Java 9
-                Tooltip.class.getMethod("setShowDelay", Duration.class).invoke(tooltip, new Duration(openDelay));
-                Tooltip.class.getMethod("setShowDuration", Duration.class).invoke(tooltip, new Duration(visibleDelay));
-                Tooltip.class.getMethod("setHideDelay", Duration.class).invoke(tooltip, new Duration(closeDelay));
-            } catch (ReflectiveOperationException e2) {
-                e.addSuppressed(e2);
-                Logging.LOG.log(Level.SEVERE, "Cannot install tooltip", e);
+                // Java 8
+                Class<?> behaviorClass = Class.forName("javafx.scene.control.Tooltip$TooltipBehavior");
+                Constructor<?> behaviorConstructor = behaviorClass.getDeclaredConstructor(Duration.class, Duration.class, Duration.class, boolean.class);
+                behaviorConstructor.setAccessible(true);
+                Object behavior = behaviorConstructor.newInstance(new Duration(openDelay), new Duration(visibleDelay), new Duration(closeDelay), false);
+                Method installMethod = behaviorClass.getDeclaredMethod("install", Node.class, Tooltip.class);
+                installMethod.setAccessible(true);
+                installMethod.invoke(behavior, node, tooltip);
+            } catch (ReflectiveOperationException e) {
+                try {
+                    // Java 9
+                    Tooltip.class.getMethod("setShowDelay", Duration.class).invoke(tooltip, new Duration(openDelay));
+                    Tooltip.class.getMethod("setShowDuration", Duration.class).invoke(tooltip, new Duration(visibleDelay));
+                    Tooltip.class.getMethod("setHideDelay", Duration.class).invoke(tooltip, new Duration(closeDelay));
+                } catch (ReflectiveOperationException e2) {
+                    e.addSuppressed(e2);
+                    Logging.LOG.log(Level.SEVERE, "Cannot install tooltip", e);
+                }
+                Tooltip.install(node, tooltip);
             }
-            Tooltip.install(node, tooltip);
-        }
+        });
     }
 
     public static void openFolder(File file) {
@@ -249,11 +253,15 @@ public final class FXUtils {
                 }
                 break;
             default:
-                try {
-                    java.awt.Desktop.getDesktop().open(file);
-                } catch (Throwable e) {
-                    Logging.LOG.log(Level.SEVERE, "Unable to open " + path + " by java.awt.Desktop.getDesktop()::open", e);
-                }
+                thread(() -> {
+                    if (java.awt.Desktop.isDesktopSupported()) {
+                        try {
+                            java.awt.Desktop.getDesktop().open(file);
+                        } catch (Throwable e) {
+                            Logging.LOG.log(Level.SEVERE, "Unable to open " + path + " by java.awt.Desktop.getDesktop()::open", e);
+                        }
+                    }
+                });
         }
     }
 
@@ -265,17 +273,21 @@ public final class FXUtils {
     public static void openLink(String link) {
         if (link == null)
             return;
-        try {
-            java.awt.Desktop.getDesktop().browse(new URI(link));
-        } catch (Throwable e) {
-            if (OperatingSystem.CURRENT_OS == OperatingSystem.OSX)
+        thread(() -> {
+            if (java.awt.Desktop.isDesktopSupported()) {
                 try {
-                    Runtime.getRuntime().exec(new String[] { "/usr/bin/open", link });
-                } catch (IOException ex) {
-                    Logging.LOG.log(Level.WARNING, "Unable to open link: " + link, ex);
+                    java.awt.Desktop.getDesktop().browse(new URI(link));
+                } catch (Throwable e) {
+                    if (OperatingSystem.CURRENT_OS == OperatingSystem.OSX)
+                        try {
+                            Runtime.getRuntime().exec(new String[]{"/usr/bin/open", link});
+                        } catch (IOException ex) {
+                            Logging.LOG.log(Level.WARNING, "Unable to open link: " + link, ex);
+                        }
+                    Logging.LOG.log(Level.WARNING, "Failed to open link: " + link, e);
                 }
-            Logging.LOG.log(Level.WARNING, "Failed to open link: " + link, e);
-        }
+            }
+        });
     }
 
     public static void bindInt(JFXTextField textField, Property<Number> property) {
@@ -316,8 +328,10 @@ public final class FXUtils {
      * @param comboBox the combo box being bound with {@code property}.
      * @param property the property being bound with {@code combo box}.
      * @see #unbindEnum(JFXComboBox)
+     * @deprecated Use {@link SelectionModelSelectedItemProperty#selectedItemPropertyFor(ComboBox)}
      */
     @SuppressWarnings("unchecked")
+    @Deprecated
     public static void bindEnum(JFXComboBox<?> comboBox, Property<? extends Enum> property) {
         unbindEnum(comboBox);
         ChangeListener<Number> listener = (a, b, newValue) ->
@@ -334,6 +348,7 @@ public final class FXUtils {
      * @see #bindEnum(JFXComboBox, Property)
      */
     @SuppressWarnings("unchecked")
+    @Deprecated
     public static void unbindEnum(JFXComboBox<?> comboBox) {
         ChangeListener listener = tryCast(comboBox.getProperties().get("FXUtils.bindEnum.listener"), ChangeListener.class).orElse(null);
         if (listener == null) return;

HMCL/src/main/java/org/jackhuang/hmcl/ui/LogWindow.java

@@ -181,7 +181,7 @@ public final class LogWindow extends Stage {
                 if (newValue == Worker.State.SUCCEEDED) {
                     document = engine.getDocument();
                     body = document.getElementsByTagName("body").item(0);
-                    engine.executeScript("limitedLogs=" + Settings.instance().getLogLines());
+                    engine.executeScript("limitedLogs=" + config().getLogLines());
                     latch.countDown();
                     onDone.fireEvent(new Event(LogWindow.this));
                 }
@@ -189,14 +189,14 @@ public final class LogWindow extends Stage {
 
             boolean flag = false;
             for (String i : cboLines.getItems())
-                if (Integer.toString(Settings.instance().getLogLines()).equals(i)) {
+                if (Integer.toString(config().getLogLines()).equals(i)) {
                     cboLines.getSelectionModel().select(i);
                     flag = true;
                 }
 
             cboLines.getSelectionModel().selectedItemProperty().addListener((a, b, newValue) -> {
-                Settings.instance().setLogLines(newValue == null ? 100 : Integer.parseInt(newValue));
-                engine.executeScript("limitedLogs=" + Settings.instance().getLogLines());
+                config().setLogLines(newValue == null ? 100 : Integer.parseInt(newValue));
+                engine.executeScript("limitedLogs=" + config().getLogLines());
             });
 
             if (!flag)

HMCL/src/main/java/org/jackhuang/hmcl/ui/SVG.java

@@ -146,4 +146,8 @@ public final class SVG {
     public static Node export(ObjectBinding<? extends Paint> fill, double width, double height) {
         return createSVGPath("M23,12L19,8V11H10V13H19V16M1,18V6C1,4.89 1.9,4 3,4H15A2,2 0 0,1 17,6V9H15V6H3V18H15V15H17V18A2,2 0 0,1 15,20H3A2,2 0 0,1 1,18Z", fill, width, height);
     }
+
+    public static Node openInNew(ObjectBinding<? extends Paint> fill, double width, double height) {
+        return createSVGPath("M14,3V5H17.59L7.76,14.83L9.17,16.24L19,6.41V10H21V3M19,19H5V5H12V3H5C3.89,3 3,3.9 3,5V19A2,2 0 0,0 5,21H19A2,2 0 0,0 21,19V12H19V19Z", fill, width, height);
+    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/SettingsPage.java

@@ -25,12 +25,10 @@ import javafx.beans.WeakInvalidationListener;
 import javafx.beans.binding.Bindings;
 import javafx.beans.binding.When;
 import javafx.beans.property.*;
-import javafx.collections.FXCollections;
-import javafx.collections.ObservableList;
-import javafx.scene.control.Label;
 import javafx.scene.control.ToggleGroup;
 import javafx.scene.paint.Color;
 import javafx.scene.text.Font;
+import org.jackhuang.hmcl.Metadata;
 import org.jackhuang.hmcl.setting.*;
 import org.jackhuang.hmcl.ui.construct.Validator;
 import org.jackhuang.hmcl.ui.decorator.DecoratorPage;
@@ -48,6 +46,7 @@ import java.util.Objects;
 import java.util.Optional;
 
 import static org.jackhuang.hmcl.setting.ConfigHolder.config;
+import static org.jackhuang.hmcl.util.SelectionModelSelectedItemProperty.selectedItemPropertyFor;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
 public final class SettingsPage extends SettingsView implements DecoratorPage {
@@ -60,10 +59,12 @@ public final class SettingsPage extends SettingsView implements DecoratorPage {
     public SettingsPage() {
         FXUtils.smoothScrolling(scroll);
 
-        chkEnableGameList.selectedProperty().bindBidirectional(config().enableMainPageGameListProperty());
+        // ==== Download sources ====
+        cboDownloadSource.getItems().setAll(DownloadProviders.providersById.keySet());
+        selectedItemPropertyFor(cboDownloadSource).bindBidirectional(config().downloadTypeProperty());
+        // ====
 
-        cboDownloadSource.getSelectionModel().select(DownloadProviders.DOWNLOAD_PROVIDERS.indexOf(Settings.instance().getDownloadProvider()));
-        cboDownloadSource.getSelectionModel().selectedIndexProperty().addListener((a, b, newValue) -> Settings.instance().setDownloadProvider(DownloadProviders.getDownloadProvider(newValue.intValue())));
+        chkEnableGameList.selectedProperty().bindBidirectional(config().enableMainPageGameListProperty());
 
         cboFont.initValue(Settings.instance().getFont());
         cboFont.valueProperty().addListener((a, b, newValue) -> {
@@ -84,13 +85,10 @@ public final class SettingsPage extends SettingsView implements DecoratorPage {
 
         lblDisplay.setStyle("-fx-font: " + Settings.instance().getFont().getSize() + " \"" + Settings.instance().getFont().getFamily() + "\";");
 
-        ObservableList<Label> list = FXCollections.observableArrayList();
-        for (Locales.SupportedLocale locale : Locales.LOCALES)
-            list.add(new Label(locale.getName(config().getLocalization().getResourceBundle())));
-
-        cboLanguage.setItems(list);
-        cboLanguage.getSelectionModel().select(Locales.LOCALES.indexOf(config().getLocalization()));
-        cboLanguage.getSelectionModel().selectedIndexProperty().addListener((a, b, newValue) -> config().setLocalization(Locales.getLocale(newValue.intValue())));
+        // ==== Languages ====
+        cboLanguage.getItems().setAll(Locales.LOCALES);
+        selectedItemPropertyFor(cboLanguage).bindBidirectional(config().localizationProperty());
+        // ====
 
         // ==== Proxy ====
         txtProxyHost.textProperty().bindBidirectional(config().proxyHostProperty());
@@ -250,4 +248,9 @@ public final class SettingsPage extends SettingsView implements DecoratorPage {
         }
         UpdateHandler.updateFrom(target);
     }
+
+    @Override
+    protected void onHelp() {
+        FXUtils.openLink(Metadata.HELP_URL);
+    }
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/SettingsView.java

@@ -26,11 +26,17 @@ import javafx.scene.control.ScrollPane;
 import javafx.scene.layout.*;
 import javafx.scene.text.Text;
 import javafx.scene.text.TextAlignment;
+
+import static org.jackhuang.hmcl.setting.ConfigHolder.config;
+import static org.jackhuang.hmcl.ui.FXUtils.stringConverter;
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
 import org.jackhuang.hmcl.setting.EnumBackgroundImage;
 import org.jackhuang.hmcl.setting.EnumCommonDirectory;
 import org.jackhuang.hmcl.setting.Theme;
 import org.jackhuang.hmcl.ui.construct.*;
 import org.jackhuang.hmcl.util.i18n.I18n;
+import org.jackhuang.hmcl.util.i18n.Locales.SupportedLocale;
 
 public abstract class SettingsView extends StackPane {
     protected final JFXTextField txtProxyHost;
@@ -38,8 +44,8 @@ public abstract class SettingsView extends StackPane {
     protected final JFXTextField txtProxyUsername;
     protected final JFXPasswordField txtProxyPassword;
     protected final JFXTextField txtFontSize;
-    protected final JFXComboBox<Label> cboLanguage;
-    protected final JFXComboBox<Label> cboDownloadSource;
+    protected final JFXComboBox<SupportedLocale> cboLanguage;
+    protected final JFXComboBox<String> cboDownloadSource;
     protected final FontComboBox cboFont;
     protected final MultiFileItem<EnumCommonDirectory> fileCommonLocation;
     protected final Label lblDisplay;
@@ -73,12 +79,12 @@ public abstract class SettingsView extends StackPane {
                 ComponentList settingsPane = new ComponentList();
                 {
                     ComponentSublist updatePane = new ComponentSublist();
-                    updatePane.setTitle(I18n.i18n("update"));
+                    updatePane.setTitle(i18n("update"));
                     updatePane.setHasSubtitle(true);
                     {
                         VBox headerLeft = new VBox();
 
-                        lblUpdate = new Label(I18n.i18n("update"));
+                        lblUpdate = new Label(i18n("update"));
                         lblUpdateSub = new Label();
                         lblUpdateSub.getStyleClass().setAll("subtitle-label");
 
@@ -99,12 +105,12 @@ public abstract class SettingsView extends StackPane {
                         VBox content = new VBox();
                         content.setSpacing(8);
 
-                        chkUpdateStable = new JFXRadioButton(I18n.i18n("update.channel.stable"));
-                        chkUpdateDev = new JFXRadioButton(I18n.i18n("update.channel.dev"));
+                        chkUpdateStable = new JFXRadioButton(i18n("update.channel.stable"));
+                        chkUpdateDev = new JFXRadioButton(i18n("update.channel.dev"));
 
                         VBox noteWrapper = new VBox();
                         noteWrapper.setStyle("-fx-padding: 10 0 0 0;");
-                        lblUpdateNote = new Text(I18n.i18n("update.note"));
+                        lblUpdateNote = new Text(i18n("update.note"));
                         noteWrapper.getChildren().setAll(lblUpdateNote);
 
                         content.getChildren().setAll(chkUpdateStable, chkUpdateDev, noteWrapper);
@@ -114,11 +120,35 @@ public abstract class SettingsView extends StackPane {
                     settingsPane.getContent().add(updatePane);
                 }
 
+                {
+                    BorderPane updatePane = new BorderPane();
+                    {
+                        VBox headerLeft = new VBox();
+
+                        Label help = new Label(i18n("help"));
+                        Label helpSubtitle = new Label(i18n("help.detail"));
+                        helpSubtitle.getStyleClass().setAll("subtitle-label");
+
+                        headerLeft.getChildren().setAll(help, helpSubtitle);
+                        updatePane.setLeft(headerLeft);
+                    }
+
+                    {
+                        JFXButton btnExternal = new JFXButton();
+                        btnExternal.setOnMouseClicked(e -> onHelp());
+                        btnExternal.getStyleClass().setAll("toggle-icon4");
+                        btnExternal.setGraphic(SVG.openInNew(Theme.blackFillBinding(), -1, -1));
+
+                        updatePane.setRight(btnExternal);
+                    }
+                    settingsPane.getContent().add(updatePane);
+                }
+
                 {
                     fileCommonLocation = new MultiFileItem<>(true);
-                    fileCommonLocation.setTitle(I18n.i18n("launcher.common_directory"));
+                    fileCommonLocation.setTitle(i18n("launcher.common_directory"));
                     fileCommonLocation.setDirectory(true);
-                    fileCommonLocation.setChooserTitle(I18n.i18n("launcher.common_directory.choose"));
+                    fileCommonLocation.setChooserTitle(i18n("launcher.common_directory.choose"));
                     fileCommonLocation.setHasSubtitle(true);
                     fileCommonLocation.setCustomText("settings.custom");
 
@@ -127,10 +157,10 @@ public abstract class SettingsView extends StackPane {
 
                 {
                     backgroundItem = new MultiFileItem<>(true);
-                    backgroundItem.setTitle(I18n.i18n("launcher.background"));
-                    backgroundItem.setChooserTitle(I18n.i18n("launcher.background.choose"));
+                    backgroundItem.setTitle(i18n("launcher.background"));
+                    backgroundItem.setChooserTitle(i18n("launcher.background.choose"));
                     backgroundItem.setHasSubtitle(true);
-                    backgroundItem.setCustomText(I18n.i18n("settings.custom"));
+                    backgroundItem.setCustomText(i18n("settings.custom"));
 
                     settingsPane.getContent().add(backgroundItem);
                 }
@@ -138,7 +168,7 @@ public abstract class SettingsView extends StackPane {
                 {
                     BorderPane borderPane = new BorderPane();
 
-                    Label left = new Label(I18n.i18n("settings.launcher.enable_game_list"));
+                    Label left = new Label(i18n("settings.launcher.enable_game_list"));
                     BorderPane.setAlignment(left, Pos.CENTER_LEFT);
                     borderPane.setLeft(left);
 
@@ -155,18 +185,14 @@ public abstract class SettingsView extends StackPane {
                 {
                     BorderPane downloadSourcePane = new BorderPane();
                     {
-                        Label label = new Label(I18n.i18n("settings.launcher.download_source"));
+                        Label label = new Label(i18n("settings.launcher.download_source"));
                         BorderPane.setAlignment(label, Pos.CENTER_LEFT);
                         downloadSourcePane.setLeft(label);
                     }
 
                     {
                         cboDownloadSource = new JFXComboBox<>();
-                        FXUtils.setLimitWidth(cboDownloadSource, 400);
-                        cboDownloadSource.getItems().setAll(
-                                new Label(I18n.i18n("download.mojang")),
-                                new Label(I18n.i18n("download.BMCL"))
-                        );
+                        cboDownloadSource.setConverter(stringConverter(key -> i18n("download.provider." + key)));
                         downloadSourcePane.setRight(cboDownloadSource);
                     }
                     settingsPane.getContent().add(downloadSourcePane);
@@ -175,11 +201,12 @@ public abstract class SettingsView extends StackPane {
                 {
                     BorderPane languagePane = new BorderPane();
 
-                    Label left = new Label(I18n.i18n("settings.launcher.language"));
+                    Label left = new Label(i18n("settings.launcher.language"));
                     BorderPane.setAlignment(left, Pos.CENTER_LEFT);
                     languagePane.setLeft(left);
 
                     cboLanguage = new JFXComboBox<>();
+                    cboLanguage.setConverter(stringConverter(locale -> locale.getName(config().getLocalization().getResourceBundle())));
                     FXUtils.setLimitWidth(cboLanguage, 400);
                     languagePane.setRight(cboLanguage);
 
@@ -188,13 +215,13 @@ public abstract class SettingsView extends StackPane {
 
                 {
                     ComponentList proxyList = new ComponentList();
-                    proxyList.setTitle(I18n.i18n("settings.launcher.proxy"));
+                    proxyList.setTitle(i18n("settings.launcher.proxy"));
 
                     VBox proxyWrapper = new VBox();
                     proxyWrapper.setSpacing(10);
 
                     {
-                        chkDisableProxy = new JFXCheckBox(I18n.i18n("settings.launcher.proxy.disable"));
+                        chkDisableProxy = new JFXCheckBox(i18n("settings.launcher.proxy.disable"));
                         proxyWrapper.getChildren().add(chkDisableProxy);
                     }
 
@@ -207,8 +234,8 @@ public abstract class SettingsView extends StackPane {
 
                         {
                             HBox hBox = new HBox();
-                            chkProxyHttp = new JFXRadioButton(I18n.i18n("settings.launcher.proxy.http"));
-                            chkProxySocks = new JFXRadioButton(I18n.i18n("settings.launcher.proxy.socks"));
+                            chkProxyHttp = new JFXRadioButton(i18n("settings.launcher.proxy.http"));
+                            chkProxySocks = new JFXRadioButton(i18n("settings.launcher.proxy.socks"));
                             hBox.getChildren().setAll(chkProxyHttp, chkProxySocks);
                             proxyPane.getChildren().add(hBox);
                         }
@@ -222,7 +249,7 @@ public abstract class SettingsView extends StackPane {
                             gridPane.getRowConstraints().setAll(new RowConstraints(), new RowConstraints());
 
                             {
-                                Label host = new Label(I18n.i18n("settings.launcher.proxy.host"));
+                                Label host = new Label(i18n("settings.launcher.proxy.host"));
                                 GridPane.setRowIndex(host, 1);
                                 GridPane.setColumnIndex(host, 0);
                                 GridPane.setHalignment(host, HPos.RIGHT);
@@ -238,7 +265,7 @@ public abstract class SettingsView extends StackPane {
                             }
 
                             {
-                                Label port = new Label(I18n.i18n("settings.launcher.proxy.port"));
+                                Label port = new Label(i18n("settings.launcher.proxy.port"));
                                 GridPane.setRowIndex(port, 2);
                                 GridPane.setColumnIndex(port, 0);
                                 GridPane.setHalignment(port, HPos.RIGHT);
@@ -251,7 +278,7 @@ public abstract class SettingsView extends StackPane {
                                 GridPane.setRowIndex(txtProxyPort, 2);
                                 GridPane.setColumnIndex(txtProxyPort, 1);
                                 FXUtils.setValidateWhileTextChanged(txtProxyPort, true);
-                                txtProxyHost.getValidators().setAll(new NumberValidator(I18n.i18n("input.number"), false));
+                                txtProxyHost.getValidators().setAll(new NumberValidator(i18n("input.number"), false));
                                 gridPane.getChildren().add(txtProxyPort);
                             }
                             proxyPane.getChildren().add(gridPane);
@@ -261,7 +288,7 @@ public abstract class SettingsView extends StackPane {
                             VBox vBox = new VBox();
                             vBox.setStyle("-fx-padding: 20 0 20 5;");
 
-                            chkProxyAuthentication = new JFXCheckBox(I18n.i18n("settings.launcher.proxy.authentication"));
+                            chkProxyAuthentication = new JFXCheckBox(i18n("settings.launcher.proxy.authentication"));
                             vBox.getChildren().setAll(chkProxyAuthentication);
 
                             proxyPane.getChildren().add(vBox);
@@ -276,7 +303,7 @@ public abstract class SettingsView extends StackPane {
                             authPane.getRowConstraints().setAll(new RowConstraints(), new RowConstraints());
 
                             {
-                                Label username = new Label(I18n.i18n("settings.launcher.proxy.username"));
+                                Label username = new Label(i18n("settings.launcher.proxy.username"));
                                 GridPane.setRowIndex(username, 0);
                                 GridPane.setColumnIndex(username, 0);
                                 authPane.getChildren().add(username);
@@ -291,7 +318,7 @@ public abstract class SettingsView extends StackPane {
                             }
 
                             {
-                                Label password = new Label(I18n.i18n("settings.launcher.proxy.password"));
+                                Label password = new Label(i18n("settings.launcher.proxy.password"));
                                 GridPane.setRowIndex(password, 1);
                                 GridPane.setColumnIndex(password, 0);
                                 authPane.getChildren().add(password);
@@ -316,7 +343,7 @@ public abstract class SettingsView extends StackPane {
                 {
                     BorderPane themePane = new BorderPane();
 
-                    Label left = new Label(I18n.i18n("settings.launcher.theme"));
+                    Label left = new Label(i18n("settings.launcher.theme"));
                     BorderPane.setAlignment(left, Pos.CENTER_LEFT);
                     themePane.setLeft(left);
 
@@ -336,7 +363,7 @@ public abstract class SettingsView extends StackPane {
                         BorderPane borderPane = new BorderPane();
                         fontPane.getChildren().add(borderPane);
                         {
-                            Label left = new Label(I18n.i18n("settings.launcher.log_font"));
+                            Label left = new Label(i18n("settings.launcher.log_font"));
                             BorderPane.setAlignment(left, Pos.CENTER_LEFT);
                             borderPane.setLeft(left);
                         }
@@ -383,65 +410,65 @@ public abstract class SettingsView extends StackPane {
                     gridPane.getRowConstraints().setAll(row, row, row, row, row, row);
 
                     {
-                        Label label = new Label(I18n.i18n("about.copyright"));
+                        Label label = new Label(i18n("about.copyright"));
                         GridPane.setRowIndex(label, 0);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.copyright.statement"));
+                        Label label = new Label(i18n("about.copyright.statement"));
                         label.setWrapText(true);
                         GridPane.setRowIndex(label, 0);
                         GridPane.setColumnIndex(label, 1);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.author"));
+                        Label label = new Label(i18n("about.author"));
                         GridPane.setRowIndex(label, 1);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.author.statement"));
+                        Label label = new Label(i18n("about.author.statement"));
                         label.setWrapText(true);
                         GridPane.setRowIndex(label, 1);
                         GridPane.setColumnIndex(label, 1);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.thanks_to"));
+                        Label label = new Label(i18n("about.thanks_to"));
                         GridPane.setRowIndex(label, 2);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.thanks_to.statement"));
+                        Label label = new Label(i18n("about.thanks_to.statement"));
                         label.setWrapText(true);
                         GridPane.setRowIndex(label, 2);
                         GridPane.setColumnIndex(label, 1);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.dependency"));
+                        Label label = new Label(i18n("about.dependency"));
                         GridPane.setRowIndex(label, 3);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.dependency.statement"));
+                        Label label = new Label(i18n("about.dependency.statement"));
                         label.setWrapText(true);
                         GridPane.setRowIndex(label, 3);
                         GridPane.setColumnIndex(label, 1);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.claim"));
+                        Label label = new Label(i18n("about.claim"));
                         GridPane.setRowIndex(label, 4);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.claim.statement"));
+                        Label label = new Label(i18n("about.claim.statement"));
                         label.setWrapText(true);
                         label.setTextAlignment(TextAlignment.JUSTIFY);
                         GridPane.setRowIndex(label, 4);
@@ -449,13 +476,13 @@ public abstract class SettingsView extends StackPane {
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.open_source"));
+                        Label label = new Label(i18n("about.open_source"));
                         GridPane.setRowIndex(label, 5);
                         GridPane.setColumnIndex(label, 0);
                         gridPane.getChildren().add(label);
                     }
                     {
-                        Label label = new Label(I18n.i18n("about.open_source.statement"));
+                        Label label = new Label(i18n("about.open_source.statement"));
                         label.setWrapText(true);
                         GridPane.setRowIndex(label, 5);
                         GridPane.setColumnIndex(label, 1);
@@ -471,4 +498,5 @@ public abstract class SettingsView extends StackPane {
     }
 
     protected abstract void onUpdate();
+    protected abstract void onHelp();
 }

HMCL/src/main/java/org/jackhuang/hmcl/ui/WeakListenerHolder.java

@@ -27,10 +27,10 @@ import javafx.collections.WeakListChangeListener;
 import java.util.LinkedList;
 import java.util.List;
 
-public class WeakListenerHelper {
-    List<Object> refs = new LinkedList<>();
+public class WeakListenerHolder {
+    private List<Object> refs = new LinkedList<>();
 
-    public WeakListenerHelper() {
+    public WeakListenerHolder() {
     }
 
     public WeakInvalidationListener weak(InvalidationListener listener) {

HMCL/src/main/java/org/jackhuang/hmcl/ui/construct/ComponentList.java

@@ -100,13 +100,15 @@ public class ComponentList extends Control {
     }
 
     protected static class Skin extends SkinBase<ComponentList> {
+        private final ObservableList<Node> list;
 
         protected Skin(ComponentList control) {
             super(control);
 
+            list = MappedObservableList.create(control.getContent(), this::mapper);
+
             VBox vbox = new VBox();
-            Bindings.bindContent(vbox.getChildren(),
-                    MappedObservableList.create(control.getContent(), this::mapper));
+            Bindings.bindContent(vbox.getChildren(), list);
             getChildren().setAll(vbox);
         }
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/DatapackListItem.java

@@ -0,0 +1,43 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXCheckBox;
+import com.jfoenix.effects.JFXDepthManager;
+import javafx.geometry.Pos;
+import javafx.scene.layout.BorderPane;
+import org.jackhuang.hmcl.mod.Datapack;
+import org.jackhuang.hmcl.setting.Theme;
+import org.jackhuang.hmcl.ui.FXUtils;
+import org.jackhuang.hmcl.ui.SVG;
+import org.jackhuang.hmcl.ui.construct.TwoLineListItem;
+
+import java.util.function.Consumer;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class DatapackListItem extends BorderPane {
+
+    public DatapackListItem(Datapack.Pack info, Consumer<DatapackListItem> deleteCallback) {
+        JFXCheckBox chkEnabled = new JFXCheckBox();
+        BorderPane.setAlignment(chkEnabled, Pos.CENTER);
+        setLeft(chkEnabled);
+
+        TwoLineListItem modItem = new TwoLineListItem();
+        BorderPane.setAlignment(modItem, Pos.CENTER);
+        setCenter(modItem);
+
+        JFXButton btnRemove = new JFXButton();
+        FXUtils.installTooltip(btnRemove, i18n("datapack.remove"));
+        btnRemove.setOnMouseClicked(e -> deleteCallback.accept(this));
+        btnRemove.getStyleClass().add("toggle-icon4");
+        BorderPane.setAlignment(btnRemove, Pos.CENTER);
+        btnRemove.setGraphic(SVG.close(Theme.blackFillBinding(), 15, 15));
+        setRight(btnRemove);
+
+        setStyle("-fx-background-radius: 2; -fx-background-color: white; -fx-padding: 8;");
+        JFXDepthManager.setDepth(this, 1);
+        modItem.setTitle(info.getId());
+        modItem.setSubtitle(info.getDescription());
+        chkEnabled.selectedProperty().bindBidirectional(info.activeProperty());
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/DatapackListPage.java

@@ -0,0 +1,103 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+import javafx.collections.ObservableList;
+import javafx.scene.input.TransferMode;
+import javafx.stage.FileChooser;
+import org.jackhuang.hmcl.mod.Datapack;
+import org.jackhuang.hmcl.ui.Controllers;
+import org.jackhuang.hmcl.ui.ListPage;
+import org.jackhuang.hmcl.ui.decorator.DecoratorPage;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.Logging;
+import org.jackhuang.hmcl.util.MappedObservableList;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Path;
+import java.util.*;
+import java.util.logging.Level;
+import java.util.stream.Collectors;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class DatapackListPage extends ListPage<DatapackListItem> implements DecoratorPage {
+    private final StringProperty title = new SimpleStringProperty();
+    private final ObservableList<DatapackListItem> list; // Hold weak references
+    private final Path worldDir;
+    private final Datapack datapack;
+
+    public DatapackListPage(String worldName, Path worldDir) {
+        this.worldDir = worldDir;
+
+        title.set(i18n("datapack.title", worldName));
+
+        datapack = new Datapack(worldDir.resolve("datapacks"));
+        datapack.loadFromDir();
+
+        list = MappedObservableList.create(datapack.getInfo(), pack -> new DatapackListItem(pack, item -> {
+            try {
+                datapack.deletePack(pack.getId());
+            } catch (IOException e) {
+                Logging.LOG.warning("Failed to delete datapack");
+            }
+        }));
+        itemsProperty().bindContent(list);
+
+        setOnDragOver(event -> {
+            if (event.getGestureSource() != this && event.getDragboard().hasFiles())
+                event.acceptTransferModes(TransferMode.COPY_OR_MOVE);
+            event.consume();
+        });
+
+        setOnDragDropped(event -> {
+            List<File> files = event.getDragboard().getFiles();
+            if (files != null) {
+                Collection<File> mods = files.stream()
+                        .filter(it -> Objects.equals("zip", FileUtils.getExtension(it)))
+                        .collect(Collectors.toList());
+                if (!mods.isEmpty()) {
+                    mods.forEach(it -> {
+                        try {
+                            Datapack zip = new Datapack(it.toPath());
+                            zip.loadFromZip();
+                            zip.installTo(worldDir);
+                        } catch (IOException | IllegalArgumentException e) {
+                            Logging.LOG.log(Level.WARNING, "Unable to parse datapack file " + it, e);
+                        }
+                    });
+                    event.setDropCompleted(true);
+                }
+            }
+            datapack.loadFromDir();
+            event.consume();
+        });
+    }
+
+    @Override
+    public StringProperty titleProperty() {
+        return title;
+    }
+
+    @Override
+    public void add() {
+        FileChooser chooser = new FileChooser();
+        chooser.setTitle(i18n("datapack.choose_datapack"));
+        chooser.getExtensionFilters().setAll(new FileChooser.ExtensionFilter(i18n("extension.datapack"), "*.zip"));
+        List<File> res = chooser.showOpenMultipleDialog(Controllers.getStage());
+
+        if (res != null)
+            res.forEach(it -> {
+                try {
+                    Datapack zip = new Datapack(it.toPath());
+                    zip.loadFromZip();
+                    zip.installTo(worldDir);
+                } catch (IOException | IllegalArgumentException e) {
+                    Logging.LOG.log(Level.WARNING, "Unable to parse datapack file " + it, e);
+                }
+            });
+
+        datapack.loadFromDir();
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameAdvancedListItem.java

@@ -24,7 +24,7 @@ import org.jackhuang.hmcl.event.EventBus;
 import org.jackhuang.hmcl.event.RefreshedVersionsEvent;
 import org.jackhuang.hmcl.setting.Profile;
 import org.jackhuang.hmcl.setting.Profiles;
-import org.jackhuang.hmcl.ui.WeakListenerHelper;
+import org.jackhuang.hmcl.ui.WeakListenerHolder;
 import org.jackhuang.hmcl.ui.construct.AdvancedListItem;
 
 import java.io.File;
@@ -32,16 +32,16 @@ import java.io.File;
 import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
 
 public class GameAdvancedListItem extends AdvancedListItem {
-    private final WeakListenerHelper helper = new WeakListenerHelper();
+    private final WeakListenerHolder listenerHolder = new WeakListenerHolder();
 
     private Profile profile;
     private InvalidationListener listener = o -> loadVersion();
 
     public GameAdvancedListItem() {
-        Profiles.selectedProfileProperty().addListener(helper.weak((a, b, newValue) -> {
+        Profiles.selectedProfileProperty().addListener(listenerHolder.weak((a, b, newValue) -> {
             JFXUtilities.runInFX(() -> loadProfile(newValue));
         }));
-        helper.add(EventBus.EVENT_BUS.channel(RefreshedVersionsEvent.class).registerWeak(event -> {
+        listenerHolder.add(EventBus.EVENT_BUS.channel(RefreshedVersionsEvent.class).registerWeak(event -> {
             JFXUtilities.runInFX(() -> {
                 if (profile != null && profile.getRepository() == event.getSource())
                     loadVersion();

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameList.java

@@ -31,7 +31,7 @@ import org.jackhuang.hmcl.game.HMCLGameRepository;
 import org.jackhuang.hmcl.setting.Profile;
 import org.jackhuang.hmcl.setting.Profiles;
 import org.jackhuang.hmcl.ui.Controllers;
-import org.jackhuang.hmcl.ui.WeakListenerHelper;
+import org.jackhuang.hmcl.ui.WeakListenerHolder;
 import org.jackhuang.hmcl.ui.decorator.DecoratorPage;
 import org.jackhuang.hmcl.ui.download.DownloadWizardProvider;
 import org.jackhuang.hmcl.util.VersionNumber;
@@ -70,8 +70,8 @@ public class GameList extends Control implements DecoratorPage {
 
     private void loadVersions(HMCLGameRepository repository) {
         toggleGroup = new ToggleGroup();
-        WeakListenerHelper helper = new WeakListenerHelper();
-        toggleGroup.getProperties().put("ReferenceHolder", helper);
+        WeakListenerHolder listenerHolder = new WeakListenerHolder();
+        toggleGroup.getProperties().put("ReferenceHolder", listenerHolder);
         List<GameListItem> children = repository.getVersions().parallelStream()
                 .filter(version -> !version.isHidden())
                 .sorted((a, b) -> VersionNumber.COMPARATOR.compare(VersionNumber.asVersion(a.getId()), VersionNumber.asVersion(b.getId())))
@@ -83,7 +83,7 @@ public class GameList extends Control implements DecoratorPage {
                 items.setAll(children);
                 children.forEach(GameListItem::checkSelection);
 
-                profile.selectedVersionProperty().addListener(helper.weak((a, b, newValue) -> {
+                profile.selectedVersionProperty().addListener(listenerHolder.weak((a, b, newValue) -> {
                     Platform.runLater(() -> {
                         children.forEach(it -> it.selectedProperty().set(false));
                         children.stream()

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameListItem.java

@@ -59,7 +59,7 @@ public class GameListItem extends Control {
 
         title.set(id);
         subtitle.set(libraries.toString());
-        selected.set(profile.getSelectedVersion().equals(id));
+        selected.set(id.equals(profile.getSelectedVersion()));
 
         File iconFile = profile.getRepository().getVersionIcon(version);
         if (iconFile.exists())

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/GameListItemSkin.java

@@ -92,7 +92,7 @@ public class GameListItemSkin extends SkinBase<GameListItem> {
         };
 
         menu.getChildren().setAll(
-                new IconedMenuItem(limitWidth.apply(SVG.gear(Theme.blackFillBinding(), 14, 14)), i18n("settings"), wrap.apply(skinnable::modifyGameSettings)),
+                new IconedMenuItem(limitWidth.apply(SVG.gear(Theme.blackFillBinding(), 14, 14)), i18n("version.manage.manage"), wrap.apply(skinnable::modifyGameSettings)),
                 new IconedMenuItem(limitWidth.apply(SVG.pencil(Theme.blackFillBinding(), 14, 14)), i18n("version.manage.rename"), wrap.apply(skinnable::rename)),
                 new IconedMenuItem(limitWidth.apply(SVG.delete(Theme.blackFillBinding(), 14, 14)), i18n("version.manage.remove"), wrap.apply(skinnable::remove)),
                 new IconedMenuItem(limitWidth.apply(SVG.export(Theme.blackFillBinding(), 14, 14)), i18n("modpack.export"), wrap.apply(skinnable::export)),

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/InstallerListPage.java

@@ -60,6 +60,7 @@ public class InstallerListPage extends ListPage<InstallerItem> {
                     .start();
         };
 
+        itemsProperty().clear();
         analyzer.getForge().ifPresent(library -> itemsProperty().add(new InstallerItem("Forge", library.getVersion(), removeAction.apply(library))));
         analyzer.getLiteLoader().ifPresent(library -> itemsProperty().add(new InstallerItem("LiteLoader", library.getVersion(), removeAction.apply(library))));
         analyzer.getOptiFine().ifPresent(library -> itemsProperty().add(new InstallerItem("OptiFine", library.getVersion(), removeAction.apply(library))));

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/ModItem.java

@@ -15,7 +15,7 @@
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see {http://www.gnu.org/licenses/}.
  */
-package org.jackhuang.hmcl.ui;
+package org.jackhuang.hmcl.ui.versions;
 
 import com.jfoenix.concurrency.JFXUtilities;
 import com.jfoenix.controls.JFXButton;
@@ -25,6 +25,8 @@ import javafx.geometry.Pos;
 import javafx.scene.layout.BorderPane;
 import org.jackhuang.hmcl.mod.ModInfo;
 import org.jackhuang.hmcl.setting.Theme;
+import org.jackhuang.hmcl.ui.FXUtils;
+import org.jackhuang.hmcl.ui.SVG;
 import org.jackhuang.hmcl.ui.construct.TwoLineListItem;
 import org.jackhuang.hmcl.util.StringUtils;
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/ModListPage.java

@@ -28,7 +28,6 @@ import org.jackhuang.hmcl.task.Task;
 import org.jackhuang.hmcl.ui.Controllers;
 import org.jackhuang.hmcl.ui.FXUtils;
 import org.jackhuang.hmcl.ui.ListPage;
-import org.jackhuang.hmcl.ui.ModItem;
 import org.jackhuang.hmcl.util.FileUtils;
 import org.jackhuang.hmcl.util.Logging;
 

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/VersionPage.java

@@ -48,6 +48,8 @@ public final class VersionPage extends StackPane implements DecoratorPage {
     @FXML
     private InstallerListPage installer;
     @FXML
+    private WorldListPage world;
+    @FXML
     private JFXListView<?> browseList;
     @FXML
     private JFXListView<?> managementList;
@@ -90,13 +92,14 @@ public final class VersionPage extends StackPane implements DecoratorPage {
         this.version = id;
         this.profile = profile;
 
-        title.set(i18n("settings.game") + " - " + id);
+        title.set(i18n("version.manage.manage") + " - " + id);
 
         versionSettings.loadVersionSetting(profile, id);
         mod.setParentTab(tabPane);
         modTab.setUserData(mod);
         mod.loadMods(profile.getModManager(), id);
         installer.loadVersion(profile, id);
+        world.loadVersion(profile, id);
     }
 
     @FXML

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/VersionSettingsPage.java

@@ -134,9 +134,9 @@ public final class VersionSettingsPage extends StackPane implements DecoratorPag
             // because versionSettings can be the global one.
             // global versionSettings.usesGlobal is always true.
             if (newValue)
-                profile.specializeVersionSetting(versionId);
+                profile.getRepository().specializeVersionSetting(versionId);
             else
-                profile.globalizeVersionSetting(versionId);
+                profile.getRepository().globalizeVersionSetting(versionId);
 
             Platform.runLater(() -> loadVersionSetting(profile, versionId));
         });

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/WorldExportPage.java

@@ -0,0 +1,62 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import javafx.beans.property.SimpleStringProperty;
+import javafx.beans.property.StringProperty;
+import javafx.scene.control.Skin;
+import org.jackhuang.hmcl.game.World;
+import org.jackhuang.hmcl.task.Task;
+import org.jackhuang.hmcl.ui.wizard.WizardSinglePage;
+
+import java.nio.file.Path;
+import java.nio.file.Paths;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class WorldExportPage extends WizardSinglePage {
+    private final StringProperty path = new SimpleStringProperty();
+    private final StringProperty gameVersion = new SimpleStringProperty();
+    private final StringProperty worldName = new SimpleStringProperty();
+    private final World world;
+
+    public WorldExportPage(World world, Path export, Runnable onFinish) {
+        super(onFinish);
+
+        this.world = world;
+
+        path.set(export.toString());
+        gameVersion.set(world.getGameVersion());
+        worldName.set(world.getWorldName());
+    }
+
+    @Override
+    protected Skin<?> createDefaultSkin() {
+        return new WorldExportPageSkin(this);
+    }
+
+
+    public StringProperty pathProperty() {
+        return path;
+    }
+
+    public StringProperty gameVersionProperty() {
+        return gameVersion;
+    }
+
+    public StringProperty worldNameProperty() {
+        return worldName;
+    }
+
+    public void export() {
+        onFinish.run();
+    }
+
+    @Override
+    public String getTitle() {
+        return i18n("world.export.wizard", world.getFileName());
+    }
+
+    @Override
+    protected Object finish() {
+        return Task.of(i18n("world.export.wizard", worldName.get()), () -> world.export(Paths.get(path.get()), worldName.get()));
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/WorldExportPageSkin.java

@@ -0,0 +1,81 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXTextField;
+import javafx.beans.binding.Bindings;
+import javafx.geometry.Insets;
+import javafx.geometry.Pos;
+import javafx.scene.control.Label;
+import javafx.scene.control.SkinBase;
+import javafx.scene.layout.BorderPane;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
+import org.jackhuang.hmcl.ui.FXUtils;
+import org.jackhuang.hmcl.ui.construct.ComponentList;
+import org.jackhuang.hmcl.ui.construct.FileItem;
+
+import java.nio.file.Files;
+import java.nio.file.Paths;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class WorldExportPageSkin extends SkinBase<WorldExportPage> {
+
+    public WorldExportPageSkin(WorldExportPage skinnable) {
+        super(skinnable);
+
+        Insets insets = new Insets(0, 0, 12, 0);
+        VBox container = new VBox();
+        container.setSpacing(16);
+        container.setAlignment(Pos.CENTER);
+        FXUtils.setLimitWidth(container, 500);
+        {
+            HBox labelContainer = new HBox();
+            labelContainer.setPadding(new Insets(0, 0, 0, 5));
+            Label label = new Label(i18n("world.export"));
+            labelContainer.getChildren().setAll(label);
+            container.getChildren().add(labelContainer);
+        }
+
+        ComponentList list = new ComponentList();
+
+        FileItem fileItem = new FileItem();
+        fileItem.setName(i18n("world.export.location"));
+        fileItem.pathProperty().bindBidirectional(skinnable.pathProperty());
+        list.getContent().add(fileItem);
+
+        JFXTextField txtWorldName = new JFXTextField();
+        txtWorldName.textProperty().bindBidirectional(skinnable.worldNameProperty());
+        txtWorldName.setLabelFloat(true);
+        txtWorldName.setPromptText(i18n("world.name"));
+        StackPane.setMargin(txtWorldName, insets);
+        list.getContent().add(txtWorldName);
+
+        Label lblGameVersionTitle = new Label(i18n("world.game_version"));
+        Label lblGameVersion = new Label();
+        lblGameVersion.textProperty().bind(skinnable.gameVersionProperty());
+        BorderPane gameVersionPane = new BorderPane();
+        gameVersionPane.setPadding(new Insets(4, 0, 4, 0));
+        gameVersionPane.setLeft(lblGameVersionTitle);
+        gameVersionPane.setRight(lblGameVersion);
+        list.getContent().add(gameVersionPane);
+
+        container.getChildren().add(list);
+
+        JFXButton btnExport = new JFXButton(i18n("button.export"));
+        btnExport.disableProperty().bind(Bindings.createBooleanBinding(() -> txtWorldName.getText().isEmpty() || Files.exists(Paths.get(fileItem.getPath())),
+                txtWorldName.textProperty().isEmpty(), fileItem.pathProperty()));
+        btnExport.setButtonType(JFXButton.ButtonType.RAISED);
+        btnExport.getStyleClass().add("jfx-button-raised");
+        btnExport.setOnMouseClicked(e -> skinnable.export());
+        HBox bottom = new HBox();
+        bottom.setAlignment(Pos.CENTER_RIGHT);
+        bottom.getChildren().setAll(btnExport);
+        container.getChildren().add(bottom);
+
+        getChildren().setAll(container);
+    }
+
+
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/WorldListItem.java

@@ -0,0 +1,63 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import javafx.beans.property.*;
+import javafx.scene.control.Control;
+import javafx.scene.control.Skin;
+import javafx.scene.image.Image;
+import javafx.stage.FileChooser;
+import org.jackhuang.hmcl.game.World;
+import org.jackhuang.hmcl.ui.Controllers;
+import org.jackhuang.hmcl.ui.wizard.SinglePageWizardProvider;
+
+import java.io.File;
+import java.util.Date;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class WorldListItem extends Control {
+    private final StringProperty title = new SimpleStringProperty();
+    private final StringProperty subtitle = new SimpleStringProperty();
+    private final ObjectProperty<Image> image = new SimpleObjectProperty<>();
+    private final World world;
+
+    public WorldListItem(World world) {
+        this.world = world;
+
+        title.set(world.getWorldName());
+        subtitle.set(i18n("world.description", world.getFileName(), new Date(world.getLastPlayed()).toString(), world.getGameVersion()));
+    }
+
+    @Override
+    protected Skin<?> createDefaultSkin() {
+        return new WorldListItemSkin(this);
+    }
+
+    public StringProperty titleProperty() {
+        return title;
+    }
+
+    public StringProperty subtitleProperty() {
+        return subtitle;
+    }
+
+    public ObjectProperty<Image> imageProperty() {
+        return image;
+    }
+
+    public void export() {
+        FileChooser fileChooser = new FileChooser();
+        fileChooser.setTitle(i18n("world.export.title"));
+        fileChooser.getExtensionFilters().add(new FileChooser.ExtensionFilter(i18n("world"), "*.zip"));
+        fileChooser.setInitialFileName(world.getWorldName());
+        File file = fileChooser.showSaveDialog(Controllers.getStage());
+        if (file == null) {
+            return;
+        }
+
+        Controllers.getDecorator().startWizard(new SinglePageWizardProvider(controller -> new WorldExportPage(world, file.toPath(), controller::onFinish)));
+    }
+
+    public void manageDatapacks() {
+        Controllers.navigate(new DatapackListPage(world.getWorldName(), world.getFile()));
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/WorldListItemSkin.java

@@ -0,0 +1,89 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import com.jfoenix.controls.JFXButton;
+import com.jfoenix.controls.JFXPopup;
+import com.jfoenix.effects.JFXDepthManager;
+import javafx.geometry.Pos;
+import javafx.scene.Node;
+import javafx.scene.control.SkinBase;
+import javafx.scene.image.ImageView;
+import javafx.scene.layout.BorderPane;
+import javafx.scene.layout.HBox;
+import javafx.scene.layout.StackPane;
+import javafx.scene.layout.VBox;
+import org.jackhuang.hmcl.setting.Theme;
+import org.jackhuang.hmcl.ui.FXUtils;
+import org.jackhuang.hmcl.ui.SVG;
+import org.jackhuang.hmcl.ui.construct.IconedMenuItem;
+import org.jackhuang.hmcl.ui.construct.TwoLineListItem;
+
+import java.util.function.Function;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class WorldListItemSkin extends SkinBase<WorldListItem> {
+
+    public WorldListItemSkin(WorldListItem skinnable) {
+        super(skinnable);
+
+        BorderPane root = new BorderPane();
+
+        HBox center = new HBox();
+        center.setSpacing(8);
+        center.setAlignment(Pos.CENTER_LEFT);
+
+        StackPane imageViewContainer = new StackPane();
+        FXUtils.setLimitWidth(imageViewContainer, 32);
+        FXUtils.setLimitHeight(imageViewContainer, 32);
+
+        ImageView imageView = new ImageView();
+        FXUtils.limitSize(imageView, 32, 32);
+        imageView.imageProperty().bind(skinnable.imageProperty());
+        imageViewContainer.getChildren().setAll(imageView);
+
+        TwoLineListItem item = new TwoLineListItem();
+        BorderPane.setAlignment(item, Pos.CENTER);
+        center.getChildren().setAll(imageView, item);
+        root.setCenter(center);
+
+        VBox menu = new VBox();
+        JFXPopup popup = new JFXPopup(menu);
+
+        Function<Runnable, Runnable> wrap = r -> () -> {
+            r.run();
+            popup.hide();
+        };
+
+        Function<Node, Node> limitWidth = node -> {
+            StackPane pane = new StackPane(node);
+            pane.setAlignment(Pos.CENTER);
+            FXUtils.setLimitWidth(pane, 14);
+            FXUtils.setLimitHeight(pane, 14);
+            return pane;
+        };
+
+        menu.getChildren().setAll(
+                new IconedMenuItem(limitWidth.apply(SVG.gear(Theme.blackFillBinding(), 14, 14)), i18n("world.datapack"), wrap.apply(skinnable::manageDatapacks)),
+                new IconedMenuItem(limitWidth.apply(SVG.export(Theme.blackFillBinding(), 14, 14)), i18n("world.export"), wrap.apply(skinnable::export)));
+
+        HBox right = new HBox();
+        right.setAlignment(Pos.CENTER_RIGHT);
+
+        JFXButton btnManage = new JFXButton();
+        btnManage.setOnMouseClicked(e -> {
+            popup.show(root, JFXPopup.PopupVPosition.TOP, JFXPopup.PopupHPosition.RIGHT, 0, root.getHeight());
+        });
+        btnManage.getStyleClass().add("toggle-icon4");
+        BorderPane.setAlignment(btnManage, Pos.CENTER);
+        btnManage.setGraphic(SVG.dotsVertical(Theme.blackFillBinding(), -1, -1));
+        right.getChildren().add(btnManage);
+        root.setRight(right);
+
+        root.setStyle("-fx-background-color: white; -fx-padding: 8 8 8 0;");
+        JFXDepthManager.setDepth(root, 1);
+        item.titleProperty().bind(skinnable.titleProperty());
+        item.subtitleProperty().bind(skinnable.subtitleProperty());
+
+        getChildren().setAll(root);
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/versions/WorldListPage.java

@@ -0,0 +1,57 @@
+package org.jackhuang.hmcl.ui.versions;
+
+import javafx.stage.FileChooser;
+import org.jackhuang.hmcl.game.World;
+import org.jackhuang.hmcl.setting.Profile;
+import org.jackhuang.hmcl.ui.Controllers;
+import org.jackhuang.hmcl.ui.ListPage;
+import org.jackhuang.hmcl.util.Logging;
+
+import java.io.File;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.List;
+import java.util.logging.Level;
+
+import static org.jackhuang.hmcl.util.i18n.I18n.i18n;
+
+public class WorldListPage extends ListPage<WorldListItem> {
+    private Path savesDir;
+
+    public WorldListPage() {
+    }
+
+    public void loadVersion(Profile profile, String id) {
+        this.savesDir = profile.getRepository().getRunDirectory(id).toPath().resolve("saves");
+
+        itemsProperty().clear();
+        try {
+            if (Files.exists(savesDir))
+                for (Path worldDir : Files.newDirectoryStream(savesDir)) {
+                    itemsProperty().add(new WorldListItem(new World(worldDir)));
+                }
+        } catch (IOException e) {
+            Logging.LOG.log(Level.WARNING, "Failed to read saves", e);
+        }
+    }
+
+    @Override
+    public void add() {
+        FileChooser chooser = new FileChooser();
+        chooser.setTitle(i18n("world.choose_world"));
+        chooser.getExtensionFilters().setAll(new FileChooser.ExtensionFilter(i18n("world.extension"), "*.zip"));
+        List<File> res = chooser.showOpenMultipleDialog(Controllers.getStage());
+
+        if (res == null) return;
+        res.forEach(it -> {
+            try {
+                World world = new World(it.toPath());
+                world.install(savesDir, world.getWorldName());
+                itemsProperty().add(new WorldListItem(new World(savesDir.resolve(world.getWorldName()))));
+            } catch (IOException | IllegalArgumentException e) {
+                Logging.LOG.log(Level.WARNING, "Unable to parse datapack file " + it, e);
+            }
+        });
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/wizard/SinglePageWizardProvider.java

@@ -0,0 +1,37 @@
+package org.jackhuang.hmcl.ui.wizard;
+
+import javafx.scene.Node;
+
+import java.util.Map;
+import java.util.function.Function;
+
+public class SinglePageWizardProvider implements WizardProvider {
+
+    private final Function<WizardController, WizardSinglePage> provider;
+    private WizardSinglePage page;
+
+    public SinglePageWizardProvider(Function<WizardController, WizardSinglePage> provider) {
+        this.provider = provider;
+    }
+
+    @Override
+    public void start(Map<String, Object> settings) {
+    }
+
+    @Override
+    public Object finish(Map<String, Object> settings) {
+        return page.finish();
+    }
+
+    @Override
+    public Node createPage(WizardController controller, int step, Map<String, Object> settings) {
+        if (step != 0) throw new IllegalStateException("Step must be 0");
+
+        return page = provider.apply(controller);
+    }
+
+    @Override
+    public boolean cancel() {
+        return true;
+    }
+}

HMCL/src/main/java/org/jackhuang/hmcl/ui/wizard/WizardSinglePage.java

@@ -0,0 +1,19 @@
+package org.jackhuang.hmcl.ui.wizard;
+
+import javafx.scene.control.Control;
+
+import java.util.Map;
+
+public abstract class WizardSinglePage extends Control implements WizardPage {
+    protected final Runnable onFinish;
+
+    protected WizardSinglePage(Runnable onFinish) {
+        this.onFinish = onFinish;
+    }
+
+    protected abstract Object finish();
+
+    @Override
+    public void cleanup(Map<String, Object> settings) {
+    }
+}

HMCL/src/main/resources/assets/fxml/version/version.fxml

@@ -7,6 +7,7 @@
 <?import org.jackhuang.hmcl.ui.versions.VersionSettingsPage?>
 <?import org.jackhuang.hmcl.ui.versions.ModListPage?>
 <?import org.jackhuang.hmcl.ui.versions.InstallerListPage?>
+<?import org.jackhuang.hmcl.ui.versions.WorldListPage?>
 <fx:root xmlns="http://javafx.com/javafx"
          xmlns:fx="http://javafx.com/fxml"
          fx:id="rootPane"
@@ -23,6 +24,9 @@
             <Tab text="%settings.tabs.installers">
                 <InstallerListPage fx:id="installer" />
             </Tab>
+            <Tab text="%world">
+                <WorldListPage fx:id="world" />
+            </Tab>
         </JFXTabPane>
 
         <HBox alignment="TOP_RIGHT" style="-fx-padding: 2 2 2 2;" spacing="3" pickOnBounds="false">

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -70,6 +70,7 @@ button.clear=Clear
 button.delete=Delete
 button.edit=Edit
 button.install=Install
+button.export=Export
 button.no=No
 button.ok=OK
 button.refresh=Refresh
@@ -83,11 +84,11 @@ crash.NoClassDefFound=Please check "HMCL" software is complete.
 crash.user_fault=Your OS or Java environment may not be properly installed resulting in crashing of this software, please check your Java Environment or your computer!
 
 download=Download
-download.BMCL=BMCLAPI (bangbang93, https://bmclapi2.bangbang93.com/)
 download.failed=Failed to download
 download.failed.empty=No candidates. Click here to return.
 download.failed.refresh=Unable to load version list. Click here to retry.
-download.mojang=Mojang
+download.provider.bmclapi=BMCLAPI (bangbang93, https://bmclapi2.bangbang93.com/)
+download.provider.mojang=Mojang
 
 extension.bat=Windows Bat file
 extension.mod=Mod file
@@ -110,6 +111,9 @@ folder.screenshots=Screenshots
 
 general.prompt.empty=(None)
 
+help=Documentations
+help.detail=For datapacks, modpacks, etc. makers.
+
 input.email=The username must be an e-mail.
 input.number=Must be a number.
 input.not_empty=Required field
@@ -240,6 +244,24 @@ mods.add.success=Successfully added mods %s.
 mods.choose_mod=Choose your mods
 mods.remove=Remove
 
+datapack=Data packs
+datapack.add=Add data pack
+datapack.choose_datapack=Choose the datapack zip to be imported
+datapack.title=World %s - Datapacks
+datapack.remove=Remove
+
+world=Worlds/Datapacks
+world.choose_world=Choose the save zip to be imported
+world.datapack=Manage data packs
+world.description=%s. Last played time: %s. Game version: %s.
+world.export=Export this world
+world.export.title=Choose a file location to hold your world
+world.export.location=Export to
+world.export.wizard=Export world %s
+world.extension=World zip
+world.game_version=Game Version
+world.name=World Name
+
 profile=Game Directories
 profile.default=Current directory
 profile.home=User home
@@ -343,6 +365,7 @@ version.launch_script.failed=Unable to make launch script.
 version.launch_script.save=Save the launch script
 version.launch_script.success=Finished script creation, %s.
 version.manage=Game List
+version.manage.manage=Game Management
 version.manage.redownload_assets_index=Redownload Assets Index
 version.manage.remove=Delete this game
 version.manage.remove.confirm=Sure to remove game %s? You cannot restore this game again!

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -70,6 +70,7 @@ button.clear=清除
 button.delete=刪除
 button.edit=編輯
 button.install=安裝
+button.export=導出
 button.no=否
 button.ok=確定
 button.refresh=重新整理
@@ -83,11 +84,11 @@ crash.NoClassDefFound=請確認 HMCL 本體是否完整，或更新您的 Java
 crash.user_fault=您的系統或 Java 環境可能安裝不當導致本軟體崩潰，請檢查您的 Java 環境或您的電腦！可以嘗試重新安裝 Java。
 
 download=下載
-download.BMCL=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
 download.failed=下載失敗
 download.failed.empty=沒有可供安裝的版本，點擊此處返回。
 download.failed.refresh=載入版本列表失敗，點擊此處重試。
-download.mojang=官方伺服器（Mojang）
+download.provider.bmclapi=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
+download.provider.mojang=官方伺服器（Mojang）
 
 extension.bat=Windows 腳本
 extension.mod=模組檔案
@@ -110,6 +111,9 @@ folder.screenshots=截圖資料夾
 
 general.prompt.empty=(無)
 
+help=HMCL 幫助文檔
+help.detail=可查閱資料包、整合包製作指南等內容。
+
 input.email=「使用者名稱」必須是電子信箱格式
 input.number=必須是數字
 input.not_empty=必填
@@ -240,6 +244,24 @@ mods.add.success=成功新增模組 %s。
 mods.choose_mod=選擇模組
 mods.remove=刪除
 
+datapack=數據檔
+datapack.add=添加數據檔
+datapack.choose_datapack=選擇要導入的數據包壓縮檔
+datapack.title=世界 %s - 數據檔
+datapack.remove=刪除
+
+world=世界/數據檔
+world.choose_world=選擇要導入的存檔壓縮檔
+world.datapack=管理數據檔
+world.description=%s. 上一次遊戲時間: %s. 遊戲版本: %s
+world.export=導出此世界
+world.export.title=選擇該世界的存儲位置
+world.export.location=保存到
+world.export.wizard=導出世界 %s
+world.extension=存檔壓縮檔
+world.game_version=遊戲版本
+world.name=世界名稱
+
 profile=遊戲目錄
 profile.default=目前目錄
 profile.home=主資料夾
@@ -343,6 +365,7 @@ version.launch_script.failed=生成啟動腳本失敗
 version.launch_script.save=儲存啟動腳本
 version.launch_script.success=啟動腳本已生成完畢：%s
 version.manage=遊戲列表
+version.manage.manage=游戏管理
 version.manage.redownload_assets_index=重新下載資源設定（assets_index.json）
 version.manage.remove=刪除該版本
 version.manage.remove.confirm=真的要刪除版本 %s 嗎？你將無法找回被刪除的檔案！

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -70,6 +70,7 @@ button.clear=清除
 button.delete=删除
 button.edit=修改
 button.install=安装
+button.export=导出
 button.no=否
 button.ok=确定
 button.refresh=刷新
@@ -83,11 +84,11 @@ crash.NoClassDefFound=请确认 HMCL 本体是否完整，或更新您的 Java
 crash.user_fault=您的系统或 Java 环境可能安装不当导致本软件崩溃，请检查您的 Java 环境或您的电脑！可以尝试重新安装 Java。
 
 download=下载
-download.BMCL=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
 download.failed=下载失败
 download.failed.empty=没有可供安装的版本，点击此处返回。
 download.failed.refresh=加载版本列表失败，点击此处重试。
-download.mojang=官方（Mojang）
+download.provider.bmclapi=BMCLAPI（bangbang93，https://bmclapi2.bangbang93.com/）
+download.provider.mojang=官方（Mojang）
 
 extension.bat=Windows 脚本
 extension.mod=模组文件
@@ -110,6 +111,9 @@ folder.screenshots=截图文件夹
 
 general.prompt.empty=（无）
 
+help=HMCL 帮助文档
+help.detail=可查阅数据包、整合包制作指南等内容。
+
 input.email=用户名必须是邮箱
 input.number=必须是数字
 input.not_empty=必填项
@@ -240,6 +244,24 @@ mods.add.success=成功添加模组 %s。
 mods.choose_mod=选择模组
 mods.remove=删除
 
+datapack=数据包
+datapack.add=添加数据包
+datapack.choose_datapack=选择要导入的数据包压缩包
+datapack.title=世界 %s - 数据包
+datapack.remove=删除
+
+world=世界/数据包
+world.choose_world=选择要导入的存档压缩包
+world.datapack=管理数据包
+world.description=%s. 上一次游戏时间: %s. 游戏版本: %s
+world.export=导出此世界
+world.export.title=选择该世界的存储位置
+world.export.location=保存到
+world.export.wizard=导出世界 %s
+world.extension=世界压缩包
+world.game_version=游戏版本
+world.name=世界名称
+
 profile=游戏目录
 profile.default=当前目录
 profile.home=主文件夹
@@ -343,6 +365,7 @@ version.launch_script.failed=生成启动脚本失败
 version.launch_script.save=保存启动脚本
 version.launch_script.success=启动脚本已生成完毕：%s
 version.manage=游戏列表
+version.manage.manage=游戏管理
 version.manage.redownload_assets_index=重新下载资源配置（assets_index.json）
 version.manage.remove=删除该版本
 version.manage.remove.confirm=真的要删除版本 %s 吗？你将无法找回被删除的文件！

HMCLCore/src/main/java/org/jackhuang/hmcl/download/BMCLAPIDownloadProvider.java

@@ -28,11 +28,6 @@ import org.jackhuang.hmcl.download.optifine.OptiFineBMCLVersionList;
  */
 public class BMCLAPIDownloadProvider implements DownloadProvider {
 
-    public static final BMCLAPIDownloadProvider INSTANCE = new BMCLAPIDownloadProvider();
-
-    private BMCLAPIDownloadProvider() {
-    }
-
     @Override
     public String getVersionListURL() {
         return "https://bmclapi2.bangbang93.com/mc/game/version_manifest.json";

HMCLCore/src/main/java/org/jackhuang/hmcl/download/CurseCDNDownloadProvider.java

@@ -1,27 +0,0 @@
-/*
- * Hello Minecraft! Launcher.
- * Copyright (C) 2018  huangyuhui <huanghongxun2008@126.com>
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see {http://www.gnu.org/licenses/}.
- */
-package org.jackhuang.hmcl.download;
-
-public class CurseCDNDownloadProvider extends MojangDownloadProvider {
-    public static final CurseCDNDownloadProvider INSTANCE = new CurseCDNDownloadProvider();
-
-    @Override
-    public String injectURL(String baseURL) {
-        return baseURL == null ? null : baseURL.replaceFirst("https?://files\\.minecraftforge\\.net/maven", "https://ftb.cursecdn.com/FTB2/maven");
-    }
-}

HMCLCore/src/main/java/org/jackhuang/hmcl/download/DefaultCacheRepository.java

@@ -55,7 +55,10 @@ public class DefaultCacheRepository extends CacheRepository {
 
         lock.writeLock().lock();
         try {
-            index = Constants.GSON.fromJson(FileUtils.readText(indexFile.toFile()), Index.class);
+            if (Files.isRegularFile(indexFile))
+                index = Constants.GSON.fromJson(FileUtils.readText(indexFile.toFile()), Index.class);
+            else
+                index = new Index();
         } catch (IOException e) {
             Logging.LOG.log(Level.WARNING, "Unable to read index file", e);
             index = new Index();

HMCLCore/src/main/java/org/jackhuang/hmcl/download/MojangDownloadProvider.java

@@ -23,7 +23,7 @@ import org.jackhuang.hmcl.download.liteloader.LiteLoaderVersionList;
 import org.jackhuang.hmcl.download.optifine.OptiFineBMCLVersionList;
 
 /**
- * @see <a href="http://wiki.vg">http://wiki,vg</a>
+ * @see <a href="http://wiki.vg">http://wiki.vg</a>
  * @author huangyuhui
  */
 public class MojangDownloadProvider implements DownloadProvider {
@@ -56,6 +56,6 @@ public class MojangDownloadProvider implements DownloadProvider {
 
     @Override
     public String injectURL(String baseURL) {
-            return baseURL;
+        return baseURL;
     }
 }

HMCLCore/src/main/java/org/jackhuang/hmcl/download/game/LibraryDownloadTask.java

@@ -15,6 +15,7 @@ import org.tukaani.xz.XZInputStream;
 import java.io.*;
 import java.net.URL;
 import java.nio.charset.Charset;
+import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
 import java.util.jar.JarEntry;
@@ -75,7 +76,7 @@ public class LibraryDownloadTask extends Task {
             else
                 throw new LibraryDownloadException(library, t);
         } else {
-            if (xz) unpackLibrary(jar, FileUtils.readBytes(xzFile));
+            if (xz) unpackLibrary(jar, Files.readAllBytes(xzFile.toPath()));
             if (!checksumValid(jar, library.getChecksums())) {
                 jar.delete();
                 throw new IOException("Checksum failed for " + library);
@@ -125,7 +126,7 @@ public class LibraryDownloadTask extends Task {
             if (checksums == null || checksums.isEmpty()) {
                 return true;
             }
-            byte[] fileData = FileUtils.readBytes(libPath);
+            byte[] fileData = Files.readAllBytes(libPath.toPath());
             boolean valid = checksums.contains(encodeHex(digest("SHA-1", fileData)));
             if (!valid && libPath.getName().endsWith(".jar")) {
                 valid = validateJar(fileData, checksums);

HMCLCore/src/main/java/org/jackhuang/hmcl/game/World.java

@@ -0,0 +1,162 @@
+package org.jackhuang.hmcl.game;
+
+import com.github.steveice10.opennbt.NBTIO;
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.LongTag;
+import com.github.steveice10.opennbt.tag.builtin.StringTag;
+import com.github.steveice10.opennbt.tag.builtin.Tag;
+import org.jackhuang.hmcl.util.CompressingUtils;
+import org.jackhuang.hmcl.util.FileUtils;
+import org.jackhuang.hmcl.util.Unzipper;
+import org.jackhuang.hmcl.util.Zipper;
+
+import java.io.IOException;
+import java.nio.file.FileAlreadyExistsException;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
+import java.util.stream.Collectors;
+import java.util.zip.GZIPInputStream;
+import java.util.zip.GZIPOutputStream;
+
+public class World {
+
+    private final Path file;
+    private String fileName;
+    private String worldName;
+    private String gameVersion;
+    private long lastPlayed, seed;
+
+    public World(Path file) throws IOException {
+        this.file = file;
+
+        if (Files.isDirectory(file))
+            loadFromDirectory();
+        else if (Files.isRegularFile(file))
+            loadFromZip();
+        else
+            throw new IOException("Path " + file + " cannot be recognized as a Minecraft world");
+    }
+
+    private void loadFromDirectory() throws IOException {
+        fileName = FileUtils.getName(file);
+        Path levelDat = file.resolve("level.dat");
+        getWorldName(levelDat);
+    }
+
+    public Path getFile() {
+        return file;
+    }
+
+    public String getFileName() {
+        return fileName;
+    }
+
+    public String getWorldName() {
+        return worldName;
+    }
+
+    public long getLastPlayed() {
+        return lastPlayed;
+    }
+
+    public long getSeed() {
+        return seed;
+    }
+
+    public String getGameVersion() {
+        return gameVersion;
+    }
+
+    private void loadFromZip() throws IOException {
+        try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(file)) {
+            Path root = Files.list(fs.getPath("/")).filter(Files::isDirectory).findAny()
+                    .orElseThrow(() -> new IOException("Not a valid world zip file"));
+
+            Path levelDat = root.resolve("level.dat");
+            if (!Files.exists(levelDat))
+                throw new IllegalArgumentException("Not a valid world zip file since level.dat cannot be found.");
+
+            fileName = FileUtils.getName(root);
+            getWorldName(levelDat);
+        }
+    }
+
+    private void getWorldName(Path levelDat) throws IOException {
+        CompoundTag nbt = parseLevelDat(levelDat);
+
+        CompoundTag data = nbt.get("Data");
+        String name = data.<StringTag>get("LevelName").getValue();
+        lastPlayed = data.<LongTag>get("LastPlayed").getValue();
+        seed = data.<LongTag>get("RandomSeed").getValue();
+        CompoundTag version = data.get("Version");
+        gameVersion = version.<StringTag>get("Name").getValue();
+        worldName = name;
+    }
+
+    public void rename(String newName) throws IOException {
+        if (!Files.isDirectory(file))
+            throw new IOException("Not a valid world directory");
+
+        // Change the name recorded in level.dat
+        Path levelDat = file.resolve("level.dat");
+        CompoundTag nbt = parseLevelDat(levelDat);
+        CompoundTag data = nbt.get("Data");
+        data.put(new StringTag("LevelName", newName));
+
+        NBTIO.writeTag(new GZIPOutputStream(Files.newOutputStream(levelDat)), nbt);
+
+        // then change the folder's name
+        Files.move(file, file.resolveSibling(newName));
+    }
+
+    public void install(Path savesDir, String name) throws IOException {
+        Path worldDir = savesDir.resolve(name);
+        if (Files.isDirectory(worldDir)) {
+            throw new FileAlreadyExistsException("World already exists");
+        }
+
+        if (Files.isRegularFile(file)) {
+            String subDirectoryName;
+            try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(file)) {
+                List<Path> subDirs = Files.list(fs.getPath("/")).collect(Collectors.toList());
+                if (subDirs.size() != 1) {
+                    throw new IOException("World zip malformed");
+                }
+                subDirectoryName = FileUtils.getName(subDirs.get(0));
+            }
+            new Unzipper(file, savesDir)
+                    .setSubDirectory("/" + subDirectoryName + "/")
+                    .unzip();
+        } else if (Files.isDirectory(file)) {
+            FileUtils.copyDirectory(file, worldDir);
+        }
+    }
+
+    public void export(Path zip, String worldName) throws IOException {
+        if (!Files.isDirectory(file))
+            throw new IOException();
+
+        try (Zipper zipper = new Zipper(zip)) {
+            zipper.putDirectory(file, "/" + worldName + "/");
+        }
+    }
+
+    private static CompoundTag parseLevelDat(Path path) throws IOException {
+        Tag nbt = NBTIO.readTag(new GZIPInputStream(Files.newInputStream(path)));
+        if (nbt instanceof CompoundTag)
+            return (CompoundTag) nbt;
+        else
+            throw new IOException("level.dat malformed");
+    }
+
+    public static List<World> getWorlds(Path worldDir) throws IOException {
+        List<World> worlds = new ArrayList<>();
+        for (Path world : Files.newDirectoryStream(worldDir)) {
+            worlds.add(new World(world));
+        }
+        return worlds;
+    }
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/Datapack.java

@@ -0,0 +1,222 @@
+package org.jackhuang.hmcl.mod;
+
+import com.google.gson.JsonParseException;
+import com.google.gson.annotations.SerializedName;
+import javafx.application.Platform;
+import javafx.beans.property.BooleanProperty;
+import javafx.beans.property.SimpleBooleanProperty;
+import javafx.collections.FXCollections;
+import javafx.collections.ObservableList;
+import org.jackhuang.hmcl.util.*;
+
+import java.io.IOException;
+import java.nio.file.FileSystem;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.*;
+import java.util.logging.Level;
+
+public class Datapack {
+    private boolean isMultiple;
+    private final Path path;
+    private final ObservableList<Pack> info = FXCollections.observableArrayList();
+
+    public Datapack(Path path) {
+        this.path = path;
+    }
+
+    public Path getPath() {
+        return path;
+    }
+
+    public ObservableList<Pack> getInfo() {
+        return info;
+    }
+
+    public void installTo(Path worldPath) throws IOException {
+        Path datapacks = worldPath.resolve("datapacks");
+
+        Set<String> packs = new HashSet<>();
+        for (Pack pack : info) packs.add(pack.getId());
+
+        if (Files.isDirectory(datapacks))
+            for (Path datapack : Files.newDirectoryStream(datapacks)) {
+                if (packs.contains(FileUtils.getName(datapack)))
+                    FileUtils.deleteDirectory(datapack.toFile());
+            }
+
+        if (isMultiple) {
+            new Unzipper(path, worldPath).setReplaceExistentFile(true).unzip();
+        } else {
+            new Unzipper(path, worldPath.resolve("datapacks").resolve(FileUtils.getNameWithoutExtension(path))).unzip();
+        }
+    }
+
+    public void deletePack(String pack) throws IOException {
+        FileUtils.deleteDirectory(path.resolve(pack).toFile());
+        Platform.runLater(() -> info.removeIf(p -> p.getId().equals(pack)));
+    }
+
+    public void loadFromZip() throws IOException {
+        try (FileSystem fs = CompressingUtils.createReadOnlyZipFileSystem(path)) {
+            Path datapacks = fs.getPath("/datapacks/");
+            Path mcmeta = fs.getPath("pack.mcmeta");
+            if (Files.exists(datapacks)) { // multiple datapacks
+                isMultiple = true;
+                loadFromDir(datapacks);
+            } else if (Files.exists(mcmeta)) { // single datapack
+                isMultiple = false;
+                try {
+                    PackMcMeta pack = JsonUtils.fromNonNullJson(FileUtils.readText(mcmeta), PackMcMeta.class);
+                    info.add(new Pack(mcmeta, FileUtils.getNameWithoutExtension(path), pack.getPackInfo().getDescription(), this));
+                } catch (IOException e) {
+                    Logging.LOG.log(Level.WARNING, "Failed to read datapack " + path, e);
+                }
+            } else {
+                throw new IOException("Malformed datapack zip");
+            }
+        }
+    }
+
+    public void loadFromDir() {
+        try {
+            loadFromDir(path);
+        } catch (IOException e) {
+            Logging.LOG.log(Level.WARNING, "Failed to read datapacks " + path, e);
+        }
+    }
+
+    private void loadFromDir(Path dir) throws IOException {
+        List<Pack> info = new ArrayList<>();
+
+        if (Files.isDirectory(dir))
+            for (Path subDir : Files.newDirectoryStream(dir)) {
+                Path mcmeta = subDir.resolve("pack.mcmeta");
+                Path mcmetaDisabled = subDir.resolve("pack.mcmeta.disabled");
+
+                if (!Files.exists(mcmeta) && !Files.exists(mcmetaDisabled))
+                    continue;
+
+                boolean enabled = Files.exists(mcmeta);
+
+                try {
+                    PackMcMeta pack = enabled ? JsonUtils.fromNonNullJson(FileUtils.readText(mcmeta), PackMcMeta.class)
+                            : JsonUtils.fromNonNullJson(FileUtils.readText(mcmetaDisabled), PackMcMeta.class);
+                    info.add(new Pack(enabled ? mcmeta : mcmetaDisabled, FileUtils.getName(subDir), pack.getPackInfo().getDescription(), this));
+                } catch (IOException e) {
+                    Logging.LOG.log(Level.WARNING, "Failed to read datapack " + subDir, e);
+                }
+            }
+
+        this.info.setAll(info);
+    }
+
+    public static class Pack {
+        private Path packMcMeta;
+        private final BooleanProperty active;
+        private final String id;
+        private final String description;
+        private final Datapack datapack;
+
+        public Pack(Path packMcMeta, String id, String description, Datapack datapack) {
+            this.packMcMeta = packMcMeta;
+            this.id = id;
+            this.description = description;
+            this.datapack = datapack;
+
+            active = new SimpleBooleanProperty(this, "active", !DISABLED_EXT.equals(FileUtils.getExtension(packMcMeta))) {
+                @Override
+                protected void invalidated() {
+                    Path f = Pack.this.packMcMeta.toAbsolutePath(), newF;
+                    if (DISABLED_EXT.equals(FileUtils.getExtension(f)))
+                        newF = f.getParent().resolve(FileUtils.getNameWithoutExtension(f));
+                    else
+                        newF = f.getParent().resolve(FileUtils.getName(f) + "." + DISABLED_EXT);
+
+                    try {
+                        Files.move(f, newF);
+                        Pack.this.packMcMeta = newF;
+                    } catch (IOException e) {
+                        // Mod file is occupied.
+                        Logging.LOG.warning("Unable to rename file " + f + " to " + newF);
+                    }
+                }
+            };
+        }
+
+        public String getId() {
+            return id;
+        }
+
+        public String getDescription() {
+            return description;
+        }
+
+        public Datapack getDatapack() {
+            return datapack;
+        }
+
+        public BooleanProperty activeProperty() {
+            return active;
+        }
+
+        public boolean isActive() {
+            return active.get();
+        }
+
+        public void setActive(boolean active) {
+            this.active.set(active);
+        }
+    }
+
+    private static class PackMcMeta implements Validation {
+
+        @SerializedName("pack")
+        private final PackInfo pack;
+
+        public PackMcMeta() {
+            this(new PackInfo());
+        }
+
+        public PackMcMeta(PackInfo packInfo) {
+            this.pack = packInfo;
+        }
+
+        public PackInfo getPackInfo() {
+            return pack;
+        }
+
+        @Override
+        public void validate() throws JsonParseException {
+            if (pack == null)
+                throw new JsonParseException("pack cannot be null");
+        }
+
+        public static class PackInfo {
+            @SerializedName("pack_format")
+            private final int packFormat;
+
+            @SerializedName("description")
+            private final String description;
+
+            public PackInfo() {
+                this(0, "");
+            }
+
+            public PackInfo(int packFormat, String description) {
+                this.packFormat = packFormat;
+                this.description = description;
+            }
+
+            public int getPackFormat() {
+                return packFormat;
+            }
+
+            public String getDescription() {
+                return description;
+            }
+        }
+    }
+
+    private static final String DISABLED_EXT = "disabled";
+}

HMCLCore/src/main/java/org/jackhuang/hmcl/mod/ModInfo.java

@@ -65,7 +65,7 @@ public final class ModInfo implements Comparable<ModInfo> {
                 if (DISABLED_EXTENSION.equals(FileUtils.getExtension(f)))
                     newF = new File(f.getParentFile(), FileUtils.getNameWithoutExtension(f));
                 else
-                    newF = new File(f.getParentFile(), f.getName() + ".disabled");
+                    newF = new File(f.getParentFile(), f.getName() + "." + DISABLED_EXTENSION);
 
                 if (f.renameTo(newF))
                     ModInfo.this.file = newF;

HMCLCore/src/main/java/org/jackhuang/hmcl/util/FileUtils.java

@@ -43,10 +43,18 @@ public final class FileUtils {
         return StringUtils.substringBeforeLast(file.getName(), '.');
     }
 
+    public static String getNameWithoutExtension(Path file) {
+        return StringUtils.substringBeforeLast(getName(file), '.');
+    }
+
     public static String getExtension(File file) {
         return StringUtils.substringAfterLast(file.getName(), '.');
     }
 
+    public static String getExtension(Path file) {
+        return StringUtils.substringAfterLast(getName(file), '.');
+    }
+
     /**
      * This method is for normalizing ZipPath since Path.normalize of ZipFileSystem does not work properly.
      */
@@ -63,11 +71,15 @@ public final class FileUtils {
     }
 
     public static String readText(File file, Charset charset) throws IOException {
-        return new String(readBytes(file), charset);
+        return new String(Files.readAllBytes(file.toPath()), charset);
     }
 
-    public static byte[] readBytes(File file) throws IOException {
-        return Files.readAllBytes(file.toPath());
+    public static String readText(Path file) throws IOException {
+        return readText(file, UTF_8);
+    }
+
+    public static String readText(Path file, Charset charset) throws IOException {
+        return new String(Files.readAllBytes(file), charset);
     }
 
     public static void writeText(File file, String text) throws IOException {

HMCLCore/src/main/java/org/jackhuang/hmcl/util/IntVersionNumber.java

@@ -33,8 +33,17 @@ public final class IntVersionNumber extends VersionNumber {
     final List<Integer> version;
 
     public static boolean isIntVersionNumber(String version) {
-        return version.chars().noneMatch(ch -> ch != '.' && (ch < '0' || ch > '9'))
-                && !version.contains("..") && StringUtils.isNotBlank(version);
+        if (version.chars().noneMatch(ch -> ch != '.' && (ch < '0' || ch > '9'))
+                && !version.contains("..") && StringUtils.isNotBlank(version)) {
+            String[] arr = version.split("\\.");
+            for (String str : arr)
+                if (str.length() > 9)
+                    // Numbers which are larger than 1e9 cannot be stored as integer.
+                    return false;
+            return true;
+        } else {
+            return false;
+        }
     }
 
     IntVersionNumber(String version) {

HMCLCore/src/main/java/org/jackhuang/hmcl/util/SelectionModelSelectedItemProperty.java

@@ -0,0 +1,42 @@
+/*
+ * Hello Minecraft! Launcher.
+ * Copyright (C) 2018  huangyuhui <huanghongxun2008@126.com>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see {http://www.gnu.org/licenses/}.
+ */
+package org.jackhuang.hmcl.util;
+
+import javafx.beans.property.SimpleObjectProperty;
+import javafx.scene.control.ComboBox;
+import javafx.scene.control.SelectionModel;
+
+public class SelectionModelSelectedItemProperty<T> extends SimpleObjectProperty<T> {
+
+    public static <T> SelectionModelSelectedItemProperty<T> selectedItemPropertyFor(ComboBox<T> comboBox) {
+        return new SelectionModelSelectedItemProperty<>(comboBox.getSelectionModel());
+    }
+
+    private SelectionModel<T> model;
+
+    public SelectionModelSelectedItemProperty(SelectionModel<T> model) {
+        this.model = model;
+        model.selectedItemProperty().addListener((observable, oldValue, newValue) -> set(newValue));
+        set(model.getSelectedItem());
+    }
+
+    @Override
+    protected void invalidated() {
+        model.select(get());
+    }
+}

build.gradle

@@ -36,6 +36,8 @@ subprojects {
     repositories {
         mavenCentral()
         jcenter()
+
+        maven { url 'https://jitpack.io' }
     }
 
 	sourceCompatibility = 1.8
@@ -45,6 +47,8 @@ subprojects {
         compile group: 'org.tukaani', name: 'xz', version: '1.8'
         compile group: 'org.hildan.fxgson', name: 'fx-gson', version: '3.1.0'
         compile group: 'org.jenkins-ci', name: 'constant-pool-scanner', version: '1.2'
+        compile group: 'com.github.steveice10', name: 'opennbt', version: '1.1'
+
         testCompile group: 'junit', name: 'junit', version: '4.12'
     }