plugins/org.eclipse.amalgam.explorer.activity/src/org/eclipse/amalgam/explorer/activity/internal/actions/util/MDSashForm.java

/*******************************************************************************
 * Copyright (c) 2000, 2009 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
 *     Roland Tepp (roland@videobet.com) - patch (see Bugzilla #107197)
 *     Thales - extracted MDASashForm from MasterDetailsBlock
 *******************************************************************************/
package org.eclipse.amalgam.explorer.activity.internal.actions.util;

import java.util.ArrayList;
import java.util.Iterator;

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.SashForm;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Sash;
import org.eclipse.ui.forms.FormColors;
import org.eclipse.ui.forms.IFormColors;
import org.eclipse.ui.forms.IManagedForm;

/**
 * Nice Sash Form.<br>
 * Copied from org.eclipse.ui.forms.MasterDetailsBlock.MDSashForm.
 * 
 */
public class MDSashForm extends SashForm {
	/**
	 * Sashes created.
	 */
	private ArrayList<Object> _sashes = new ArrayList<Object>(0);
	/**
	 * Listener.
	 */
	private Listener listener = new Listener() {
		@SuppressWarnings("synthetic-access")
		public void handleEvent(Event e) {
			switch (e.type) {
			case SWT.MouseEnter:
				e.widget.setData("hover", Boolean.TRUE); //$NON-NLS-1$
				((Control) e.widget).redraw();
				break;
			case SWT.MouseExit:
				e.widget.setData("hover", null); //$NON-NLS-1$
				((Control) e.widget).redraw();
				break;
			case SWT.Paint:
				onSashPaint(e);
				break;
			case SWT.Resize:
				hookSashListeners();
				break;
			}
		}
	};

	/**
	 * Constructor.
	 * 
	 * @param parent
	 * @param style
	 */
	public MDSashForm(Composite parent, int style) {
		super(parent, style);
	}

	/**
	 * @return the listener
	 */
	public Listener getListener() {
		return listener;
	}

	private void hookSashListeners() {
		purgeSashes();
		Control[] children = getChildren();
		for (int i = 0; i < children.length; i++) {
			if (children[i] instanceof Sash) {
				Sash sash = (Sash) children[i];
				if (_sashes.contains(sash))
					continue;
				sash.addListener(SWT.Paint, listener);
				sash.addListener(SWT.MouseEnter, listener);
				sash.addListener(SWT.MouseExit, listener);
				_sashes.add(sash);
			}
		}
	}

	@Override
	public void layout(boolean changed) {
		super.layout(changed);
		hookSashListeners();
	}

	@Override
	public void layout(Control[] children) {
		super.layout(children);
		hookSashListeners();
	}

	private void onSashPaint(Event e) {
		Sash sash = (Sash) e.widget;
		IManagedForm form = (IManagedForm) sash.getParent().getData("form"); //$NON-NLS-1$
		FormColors colors = form.getToolkit().getColors();
		boolean vertical = (sash.getStyle() & SWT.VERTICAL) != 0;
		GC gc = e.gc;
		Boolean hover = (Boolean) sash.getData("hover"); //$NON-NLS-1$
		gc.setBackground(colors.getColor(IFormColors.TB_BG));
		gc.setForeground(colors.getColor(IFormColors.TB_BORDER));
		Point size = sash.getSize();
		if (vertical) {
			if (hover != null)
				gc.fillRectangle(0, 0, size.x, size.y);
			// else
			// gc.drawLine(1, 0, 1, size.y-1);
		} else {
			if (hover != null)
				gc.fillRectangle(0, 0, size.x, size.y);
			// else
			// gc.drawLine(0, 1, size.x-1, 1);
		}
	}

	private void purgeSashes() {
		for (Iterator<Object> iter = _sashes.iterator(); iter.hasNext();) {
			Sash sash = (Sash) iter.next();
			if (sash.isDisposed())
				iter.remove();
		}
	}
}