// RAP [bm]: not needed without DnD support
///*******************************************************************************
// * Copyright (c) 2004, 2006 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.presentations;
//
//import org.eclipse.jface.util.Geometry;
//import org.eclipse.swt.SWT;
//import org.eclipse.swt.graphics.Point;
//import org.eclipse.swt.widgets.Control;
//import org.eclipse.swt.widgets.Event;
//import org.eclipse.swt.widgets.Listener;
//import org.eclipse.ui.internal.dnd.DragUtil;
//
///**
// * Contains various utility methods for Presentation authors
// *
// * @since 3.0
// */
//public class PresentationUtil {
// private static Point anchor;
//
// private final static int HYSTERESIS = 16;
//
// private static int initialMouseButton = 0;
//
// private final static String LISTENER_ID = PresentationUtil.class.getName()
// + ".dragListener"; //$NON-NLS-1$
//
// private static Event dragEvent;
//
// private static Listener currentListener = null;
//
// private static Control dragSource;
//
// private static Listener dragListener = new Listener() {
// public void handleEvent(Event event) {
// dragEvent = event;
// if (dragSource != event.widget) {
// dragSource = null;
// currentListener = null;
// }
// }
// };
//
// /**
// * Returns whether the mouse has moved enough to warrant
// * opening a tracker.
// */
// private static boolean hasMovedEnough(Event event) {
// return Geometry.distanceSquared(DragUtil.getEventLoc(event), anchor) >= HYSTERESIS
// * HYSTERESIS;
// }
//
// private static Listener moveListener = new Listener() {
// public void handleEvent(Event event) {
// handleMouseMove(event);
// }
// };
//
// private static Listener clickListener = new Listener() {
// public void handleEvent(Event e) {
// handleMouseClick(e);
// }
// };
//
// private static Listener mouseDownListener = new Listener() {
// public void handleEvent(Event event) {
// if (event.widget instanceof Control) {
// // Remember the button that started the drag so we
// // can forward it on the call to the 'externalDragListener'
// initialMouseButton = event.button;
//
// dragSource = (Control) event.widget;
// currentListener = (Listener) dragSource.getData(LISTENER_ID);
// anchor = DragUtil.getEventLoc(event);
//
// if (dragEvent != null && (dragEvent.widget != dragSource)) {
// dragEvent = null;
// }
// }
// }
// };
//
// private static void handleMouseClick(Event event) {
// cancelDrag();
// }
//
// private static void handleMouseMove(Event e) {
// if (currentListener != null && dragEvent != null && hasMovedEnough(e)) {
// if (dragSource != null && !dragSource.isDisposed()
// && dragSource == e.widget) {
// Event de = dragEvent;
//
// // cache the current value so we can restore it later
// int originalMouseButton = de.button;
//
// // Update the button field so that the drag listener
// // can detect whether or not it's a 'right button' drag
// de.button = initialMouseButton;
//
// Listener l = currentListener;
// cancelDrag();
// l.handleEvent(de);
//
// // Restore the event's state so that other listeners see
// // the original values
// de.button = originalMouseButton;
// } else {
// cancelDrag();
// }
// }
// }
//
// private static void cancelDrag() {
// currentListener = null;
// dragEvent = null;
// dragSource = null;
//
// initialMouseButton = 0;
// }
//
// /**
// * Adds a drag listener to the given control. The behavior is very similar
// * to control.addListener(SWT.DragDetect, dragListener), however the listener
// * attached by this method is less sensitive. The drag event is only fired
// * once the user moves the cursor more than HYSTERESIS pixels.
// * <p>
// * This is useful for registering a listener that will trigger an editor or
// * view drag, since an overly sensitive drag listener can cause users to accidentally
// * drag views when trying to select a tab.</p>
// * <p>
// * Currently, only one such drag listener can be registered at a time. </p>
// *
// * @param control the control containing the drag listener
// * @param externalDragListener the drag listener to attach
// */
// public static void addDragListener(Control control,
// Listener externalDragListener) {
// control.addListener(SWT.DragDetect, dragListener);
// control.addListener(SWT.MouseUp, clickListener);
// control.addListener(SWT.MouseDoubleClick, clickListener);
// control.addListener(SWT.MouseDown, mouseDownListener);
// control.addListener(SWT.MouseMove, moveListener);
// control.setData(LISTENER_ID, externalDragListener);
// }
//
// /**
// * Removes a drag listener that was previously attached using addDragListener
// *
// * @param control the control containing the drag listener
// * @param externalDragListener the drag listener to remove
// */
// public static void removeDragListener(Control control,
// Listener externalDragListener) {
// control.removeListener(SWT.DragDetect, dragListener);
// control.removeListener(SWT.MouseUp, clickListener);
// control.removeListener(SWT.MouseDoubleClick, clickListener);
// control.removeListener(SWT.MouseDown, mouseDownListener);
// control.removeListener(SWT.MouseMove, moveListener);
// control.setData(LISTENER_ID, null);
// if (externalDragListener == currentListener) {
// cancelDrag();
// }
// }
//
//}