bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/internal/ShortcutBarPartDragDrop.java

/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.ui.internal;

import org.eclipse.swt.events.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.widgets.*;
import org.eclipse.ui.IViewReference;

public class ShortcutBarPartDragDrop extends PartDragDrop {
	// The item that is being dragged by this PartDragDrop.
	private ToolItem draggedItem;

	public ShortcutBarPartDragDrop(LayoutPart itemPart, Control shortcutBar) {
		super(itemPart, shortcutBar);
	}
	/**
	 * @see org.eclipse.ui.internal.PartDragDrop#isDragAllowed(Point)
	 */	
	protected void isDragAllowed(Point position) {
		ToolBar toolBar = getToolBar();
		draggedItem = toolBar.getItem(position);
		if (draggedItem == null) {
			// Avoid drag from the borders.
			return;
		}
		if (draggedItem.getData(ShowFastViewContribution.FAST_VIEW) == null) {
			// Avoid drag from non-fast view icons.
			return;
		}
		super.isDragAllowed(position);
	}
	
	// Returns the shortcut bar.
	private ToolBar getToolBar() {
		return (ToolBar) getDragControl();	
	}
	/*package*/ ToolItem getDraggedItem() {
		return draggedItem;
	}
	
	/*
	 * Returns the bounds of the fast view of the view
	 * represented by the icon being dragged.
	 */
	protected Rectangle getSourceBounds() {
		IViewReference ref = (IViewReference) draggedItem.getData(ShowFastViewContribution.FAST_VIEW);
		WorkbenchPage page = (WorkbenchPage)ref.getPage();
		Perspective persp = page.getActivePerspective();
		Rectangle rect = persp.getFastViewBounds(ref);
		return rect;
	}
	/*
	 * The cursor has moved enough to open a tracker only if it is
	 * NOT still over the icon being dragged. A tracker consumes
	 * events from the queue. If a tracker is opened while we are still
	 * over the pushed ToolItem, it will never be "unpushed", since the
	 * event that unpushes it will be consumed by the tracker.
	 */
	protected boolean hasMovedEnough(MouseEvent e) {
		ToolItem currentItem = getToolBar().getItem(new Point(e.x, e.y));
		if (super.hasMovedEnough(e) && currentItem != draggedItem)
			return true;
		return false;
	}
}