Bug 366174 - PresentationUtil is not in Juno 4.2
Add back a DND util class
diff --git a/bundles/org.eclipse.ui.workbench/.settings/.api_filters b/bundles/org.eclipse.ui.workbench/.settings/.api_filters
index 870901b..4b417e9 100644
--- a/bundles/org.eclipse.ui.workbench/.settings/.api_filters
+++ b/bundles/org.eclipse.ui.workbench/.settings/.api_filters
@@ -94,6 +94,15 @@
</message_arguments>
</filter>
</resource>
+ <resource path="Eclipse UI/org/eclipse/ui/presentations/PresentationUtil.java" type="org.eclipse.ui.presentations.PresentationUtil">
+ <filter id="1108344834">
+ <message_arguments>
+ <message_argument value="3.0"/>
+ <message_argument value="3.103"/>
+ <message_argument value="org.eclipse.ui.presentations.PresentationUtil"/>
+ </message_arguments>
+ </filter>
+ </resource>
<resource path="Eclipse UI/org/eclipse/ui/progress/IProgressConstants.java" type="org.eclipse.ui.progress.IProgressConstants">
<filter id="403767336">
<message_arguments>
diff --git a/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/presentations/PresentationUtil.java b/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/presentations/PresentationUtil.java
new file mode 100644
index 0000000..b3f3948
--- /dev/null
+++ b/bundles/org.eclipse.ui.workbench/Eclipse UI/org/eclipse/ui/presentations/PresentationUtil.java
@@ -0,0 +1,173 @@
+/*******************************************************************************
+ * 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();
+ }
+ }
+
+}
