Files View drag-and-drop v1.

editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/filesview/FilesViewDropAdapter.java

Index: editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/filesview/FilesViewDropAdapter.java
===================================================================
--- editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/filesview/FilesViewDropAdapter.java	(revision 0)
+++ editor/tools/plugins/com.google.dart.tools.ui/src/com/google/dart/tools/ui/internal/filesview/FilesViewDropAdapter.java	(revision 0)
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2012, the Dart project authors.
+ * 
+ * Licensed under the Eclipse Public License v1.0 (the "License"); you may not use this file except
+ * in compliance with the License. You may obtain a copy of the License at
+ * 
+ * http://www.eclipse.org/legal/epl-v10.html
+ * 
+ * Unless required by applicable law or agreed to in writing, software distributed under the License
+ * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+ * or implied. See the License for the specific language governing permissions and limitations under
+ * the License.
+ */
+package com.google.dart.tools.ui.internal.filesview;
+
+import com.google.dart.tools.ui.actions.CreateAndRevealProjectAction;
+
+import org.eclipse.core.resources.IWorkspaceRoot;
+import org.eclipse.core.resources.ResourcesPlugin;
+import org.eclipse.core.runtime.IStatus;
+import org.eclipse.core.runtime.Status;
+import org.eclipse.jface.viewers.StructuredViewer;
+import org.eclipse.swt.dnd.DND;
+import org.eclipse.swt.dnd.DropTargetEvent;
+import org.eclipse.swt.dnd.FileTransfer;
+import org.eclipse.swt.dnd.TransferData;
+import org.eclipse.ui.IWorkbenchWindow;
+import org.eclipse.ui.PlatformUI;
+import org.eclipse.ui.views.navigator.NavigatorDropAdapter;
+
+/**
+ * Implements drop behavior for drag and drop operations that land on the files view.
+ */
+@SuppressWarnings("deprecation")
+public class FilesViewDropAdapter extends NavigatorDropAdapter {
+
+  /**
+   * Constructs a new drop adapter.
+   * 
+   * @param viewer the viewer
+   */
+  public FilesViewDropAdapter(StructuredViewer viewer) {
+    super(viewer);
+  }
+
+  @Override
+  public boolean performDrop(Object data) {
+    Object target = getCurrentTarget();
+    if (target instanceof IWorkspaceRoot) {
+      IStatus status = performProjectDrop(data);
+      return status.isOK();
+    }
+
+    return super.performDrop(data);
+  }
+
+  @Override
+  public boolean validateDrop(Object target, int dragOperation, TransferData transferType) {
+    if (target instanceof IWorkspaceRoot) {
+      //note: does not update lastValidLocation field...
+      if (FileTransfer.getInstance().isSupportedType(transferType)
+          && (dragOperation != DND.DROP_COPY)) {
+        return false;
+      }
+
+      return true;
+    }
+
+    return super.validateDrop(target, dragOperation, transferType);
+  }
+
+  @Override
+  protected Object determineTarget(DropTargetEvent event) {
+    return event.item == null ? ResourcesPlugin.getWorkspace().getRoot() : event.item.getData();
+  }
+
+  private IWorkbenchWindow getWindow() {
+    return PlatformUI.getWorkbench().getActiveWorkbenchWindow();
+  }
+
+  private IStatus performProjectDrop(Object data) {
+    if (data instanceof String[]) {
+      String[] path = (String[]) data;
+      for (String p : path) {
+        CreateAndRevealProjectAction action = new CreateAndRevealProjectAction(getWindow(), p);
+        action.run();
+        if (!action.getStatus().isOK()) {
+          return Status.CANCEL_STATUS;
+        }
+      }
+
+      return Status.OK_STATUS;
+    }
+
+    return Status.CANCEL_STATUS;
+  }
+
+}