/*******************************************************************************
* Copyright 2017 Capital One Services, LLC and Bitwise, Inc.
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
* http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package hydrograph.ui.propertywindow.widgets.utility;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseWheelListener;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
public class MouseWheelScrollingOnComposite {
public static void installMouseWheelScrollRecursively( ScrolledComposite scrollable) {
MouseWheelListener scroller = createMouseWheelScroller(scrollable);
if (scrollable.getParent() != null)
{
scrollable.getParent().addMouseWheelListener(scroller);
}
installMouseWheelScrollRecursively(scroller, scrollable);
}
public static MouseWheelListener createMouseWheelScroller(final ScrolledComposite scrollable) {
return new MouseWheelListener() {
@Override
public void mouseScrolled(MouseEvent e) {
Point currentScroll = scrollable.getOrigin();
scrollable.setOrigin(currentScroll.x, currentScroll.y - (e.count * 5));
}
};
}
public static void installMouseWheelScrollRecursively(MouseWheelListener scroller, Control c) {
c.addMouseWheelListener(scroller);
if (c instanceof Composite) {
Composite comp = (Composite) c;
for (Control child : comp.getChildren()) {
installMouseWheelScrollRecursively(scroller, child);
}
}
}
}