/*******************************************************************************
* Copyright (c) 2004, 2015 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;
} else {
return Geometry.getClosestSide(inner, p);
}
}
}