authlib-injector DnD support

HMCLCore/src/main/java/org/jackhuang/hmcl/auth/authlibinjector/AuthlibInjectorDnD.java

@@ -0,0 +1,71 @@
+/*
+ * 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.auth.authlibinjector;
+
+import java.io.UnsupportedEncodingException;
+import java.net.URLDecoder;
+import java.util.Optional;
+import java.util.function.Consumer;
+
+import javafx.event.EventHandler;
+import javafx.scene.input.DragEvent;
+import javafx.scene.input.Dragboard;
+import javafx.scene.input.TransferMode;
+
+/**
+ * @author yushijinhun
+ * @see https://github.com/yushijinhun/authlib-injector/wiki/%E5%90%AF%E5%8A%A8%E5%99%A8%E6%8A%80%E6%9C%AF%E8%A7%84%E8%8C%83#dnd-%E6%96%B9%E5%BC%8F%E6%B7%BB%E5%8A%A0-yggdrasil-%E6%9C%8D%E5%8A%A1%E7%AB%AF
+ */
+public final class AuthlibInjectorDnD {
+
+    private static final String SCHEME = "authlib-injector";
+    private static final String PATH_YGGDRASIL_SERVER = "yggdrasil-server";
+
+    private AuthlibInjectorDnD() {}
+
+    public static Optional<String> parseUrlFromDragboard(Dragboard dragboard) {
+        String uri = dragboard.getString();
+        if (uri == null) return Optional.empty();
+
+        String[] uriElements = uri.split(":");
+        if (uriElements.length == 3 && SCHEME.equals(uriElements[0]) && PATH_YGGDRASIL_SERVER.equals(uriElements[1])) {
+            try {
+                return Optional.of(URLDecoder.decode(uriElements[2], "UTF-8"));
+            } catch (UnsupportedEncodingException e) {
+                throw new IllegalStateException(e);
+            }
+        }
+        return Optional.empty();
+    }
+
+    public static EventHandler<DragEvent> dragOverHandler() {
+        return event -> parseUrlFromDragboard(event.getDragboard()).ifPresent(url -> {
+            event.acceptTransferModes(TransferMode.COPY);
+            event.consume();
+        });
+    }
+
+    public static EventHandler<DragEvent> dragDroppedHandler(Consumer<String> onUrlTransfered) {
+        return event -> parseUrlFromDragboard(event.getDragboard()).ifPresent(url -> {
+            event.setDropCompleted(true);
+            event.consume();
+            onUrlTransfered.accept(url);
+        });
+    }
+
+}