| /******************************************************************************* |
| * Copyright (c) 2004, 2017 IBM Corporation and others. |
| * All rights reserved. This program and the accompanying materials |
| * are made available under the terms of the Eclipse Public License v1.0 |
| * which accompanies this distribution, and is available at |
| * http://www.eclipse.org/legal/epl-v10.html |
| * |
| * Contributors: |
| * IBM Corporation - initial API and implementation |
| *******************************************************************************/ |
| package org.eclipse.ui.internal.dnd; |
| |
| import org.eclipse.jface.util.Geometry; |
| import org.eclipse.swt.SWT; |
| import org.eclipse.swt.graphics.Point; |
| import org.eclipse.swt.graphics.Rectangle; |
| import org.eclipse.swt.widgets.Control; |
| |
| /** |
| * Compatibility layer for the old-style drag-and-drop. Adapts an old-style |
| * IPartDropListener into an IDragTarget. |
| * |
| */ |
| public class CompatibilityDragTarget { |
| |
| // Define width of part's "hot" border |
| private final static int MARGIN = 30; |
| |
| /** |
| * Returns the relative position of the given point (in display coordinates) |
| * with respect to the given control. Returns one of SWT.LEFT, SWT.RIGHT, SWT.CENTER, SWT.TOP, |
| * or SWT.BOTTOM if the point is on the control or SWT.DEFAULT if the point is not on the control. |
| * |
| * @param control control to perform hit detection on |
| * @param toTest point to test, in display coordinates |
| * @return |
| */ |
| public static int getRelativePosition(Control c, Point toTest) { |
| Point p = c.toControl(toTest); |
| Point e = c.getSize(); |
| |
| if (p.x > e.x || p.y > e.y || p.x < 0 || p.y < 0) { |
| return SWT.DEFAULT; |
| } |
| |
| // first determine whether mouse position is in center of part |
| int hmargin = Math.min(e.x / 3, MARGIN); |
| int vmargin = Math.min(e.y / 3, MARGIN); |
| |
| Rectangle inner = new Rectangle(hmargin, vmargin, e.x - (hmargin * 2), |
| e.y - (vmargin * 2)); |
| if (inner.contains(p)) { |
| return SWT.CENTER; |
| } |
| return Geometry.getClosestSide(inner, p); |
| } |
| |
| } |