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/*
* Copyright (C) 2010 The Android Open Source Project
*
* Licensed under the Eclipse Public License, Version 1.0 (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/org/documents/epl-v10.php
*
* 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.android.ide.eclipse.adt.internal.editors.layout.gle2;
import org.eclipse.jface.viewers.TreeViewer;
import org.eclipse.swt.dnd.DND;
import org.eclipse.swt.dnd.DragSourceEvent;
import org.eclipse.swt.dnd.DragSourceListener;
import org.eclipse.swt.dnd.TextTransfer;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
import java.util.ArrayList;
/** Drag listener for the outline page */
/* package */ class OutlineDragListener implements DragSourceListener {
private TreeViewer mTreeViewer;
private OutlinePage mOutlinePage;
private final ArrayList<SelectionItem> mDragSelection = new ArrayList<SelectionItem>();
private SimpleElement[] mDragElements;
public OutlineDragListener(OutlinePage outlinePage, TreeViewer treeViewer) {
super();
mOutlinePage = outlinePage;
mTreeViewer = treeViewer;
}
@Override
public void dragStart(DragSourceEvent e) {
Tree tree = mTreeViewer.getTree();
TreeItem overTreeItem = tree.getItem(new Point(e.x, e.y));
if (overTreeItem == null) {
// Not dragging over a tree item
e.doit = false;
return;
}
CanvasViewInfo over = getViewInfo(overTreeItem);
if (over == null) {
e.doit = false;
return;
}
// The selection logic for the outline is much simpler than in the canvas,
// because for one thing, the tree selection is updated synchronously on mouse
// down, so it's not possible to start dragging a non-selected item.
// We also don't deliberately disallow root-element dragging since you can
// drag it into another form.
final LayoutCanvas canvas = mOutlinePage.getEditor().getCanvasControl();
SelectionManager selectionManager = canvas.getSelectionManager();
TreeItem[] treeSelection = tree.getSelection();
mDragSelection.clear();
for (TreeItem item : treeSelection) {
CanvasViewInfo viewInfo = getViewInfo(item);
if (viewInfo != null) {
mDragSelection.add(selectionManager.createSelection(viewInfo));
}
}
SelectionManager.sanitize(mDragSelection);
e.doit = !mDragSelection.isEmpty();
int imageCount = mDragSelection.size();
if (e.doit) {
mDragElements = SelectionItem.getAsElements(mDragSelection);
GlobalCanvasDragInfo.getInstance().startDrag(mDragElements,
mDragSelection.toArray(new SelectionItem[imageCount]),
canvas, new Runnable() {
@Override
public void run() {
canvas.getClipboardSupport().deleteSelection("Remove",
mDragSelection);
}
});
return;
}
e.detail = DND.DROP_NONE;
}
@Override
public void dragSetData(DragSourceEvent e) {
if (TextTransfer.getInstance().isSupportedType(e.dataType)) {
LayoutCanvas canvas = mOutlinePage.getEditor().getCanvasControl();
e.data = SelectionItem.getAsText(canvas, mDragSelection);
return;
}
if (SimpleXmlTransfer.getInstance().isSupportedType(e.dataType)) {
e.data = mDragElements;
return;
}
// otherwise we failed
e.detail = DND.DROP_NONE;
e.doit = false;
}
@Override
public void dragFinished(DragSourceEvent e) {
// Unregister the dragged data.
// Clear the selection
mDragSelection.clear();
mDragElements = null;
GlobalCanvasDragInfo.getInstance().stopDrag();
}
private CanvasViewInfo getViewInfo(TreeItem item) {
Object data = item.getData();
if (data != null) {
return OutlinePage.getViewInfo(data);
}
return null;
}
}
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