org.eclipse.scada.chart.swt.ChartArea.java Source code

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Here is the source code for org.eclipse.scada.chart.swt.ChartArea.java

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/*******************************************************************************
 * Copyright (c) 2011, 2014 TH4 SYSTEMS GmbH 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:
 *     TH4 SYSTEMS GmbH - initial API and implementation
 *     IBH SYSTEMS GmbH - bug fixes
 *******************************************************************************/
package org.eclipse.scada.chart.swt;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.jface.resource.LocalResourceManager;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;

public class ChartArea extends Canvas {

    private final ChartRenderer chartRenderer;

    private final LocalResourceManager resourceManager;

    public ChartArea(final Composite parent, final int style) {
        super(parent, SWT.DOUBLE_BUFFERED);
        this.chartRenderer = new ChartAreaRenderer(this);
        this.resourceManager = new LocalResourceManager(JFaceResources.getResources(parent.getDisplay()));

        addDisposeListener(new DisposeListener() {

            @Override
            public void widgetDisposed(final DisposeEvent e) {
                onDispose();
            }
        });

        addPaintListener(new PaintListener() {

            @Override
            public void paintControl(final PaintEvent e) {
                onPaint(e);
            }
        });

        addListener(SWT.Resize, new Listener() {

            @Override
            public void handleEvent(final Event event) {
                resizeAll(getClientArea());
            }
        });
    }

    public ChartRenderer getChartRenderer() {
        return this.chartRenderer;
    }

    protected void resizeAll(final Rectangle clientArea) {
        this.chartRenderer.resizeAll(clientArea);
    }

    protected void onDispose() {
        this.resourceManager.dispose();
        this.chartRenderer.dispose();
    }

    protected void onPaint(final PaintEvent e) {
        final SWTGraphics g = new SWTGraphics(e.gc, this.resourceManager);
        try {
            this.chartRenderer.paint(g);
        } finally {
            g.dispose();
        }
    }
}