SummaryBarDecorator.java

/*
 * Copyright (c) 2004-2011 Marco Maccaferri 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:
 *     Marco Maccaferri - initial API and implementation
 */

package org.eclipsetrader.ui.charts;

import java.util.ArrayList;
import java.util.List;

import org.eclipse.core.runtime.IAdaptable;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.DisposeListener;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.MouseMoveListener;
import org.eclipse.swt.events.MouseTrackListener;
import org.eclipse.swt.graphics.Point;

public class SummaryBarDecorator implements MouseListener, MouseMoveListener, MouseTrackListener, DisposeListener {

    private Point location;
    private boolean mouseDown;
    private List<ChartCanvas> decoratedCanvas = new ArrayList<ChartCanvas>();

    private IChartObjectVisitor summaryLabelVisitor = new IChartObjectVisitor() {

        @Override
        public boolean visit(IChartObject object) {
            ISummaryBarDecorator factory = null;
            if (object instanceof IAdaptable) {
                factory = (ISummaryBarDecorator) ((IAdaptable) object).getAdapter(ISummaryBarDecorator.class);
                if (factory != null) {
                    factory.updateDecorator(location != null ? location.x : SWT.DEFAULT, SWT.DEFAULT);
                }
            }
            return true;
        }
    };

    public SummaryBarDecorator() {
    }

    public void decorateCanvas(ChartCanvas canvas) {
        canvas.getCanvas().addMouseListener(this);
        canvas.getCanvas().addMouseMoveListener(this);
        canvas.getCanvas().addMouseTrackListener(this);

        canvas.getCanvas().addDisposeListener(this);

        decoratedCanvas.add(canvas);
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseListener#mouseDoubleClick(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseDoubleClick(MouseEvent e) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseListener#mouseDown(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseDown(MouseEvent e) {
        if (e.button != 1) {
            return;
        }
        if (!mouseDown) {
            location = new Point(e.x, e.y);
            updateLabel();
            mouseDown = true;
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseListener#mouseUp(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseUp(MouseEvent e) {
        if (e.button != 1) {
            return;
        }
        if (mouseDown) {
            location = null;
            updateLabel();
            mouseDown = false;
        }
    }

    private void updateLabel() {
        for (ChartCanvas canvas : decoratedCanvas) {
            canvas.accept(summaryLabelVisitor);
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseTrackListener#mouseEnter(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseEnter(MouseEvent e) {
        if (mouseDown) {
            location = new Point(e.x, e.y);
            updateLabel();
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseTrackListener#mouseExit(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseExit(MouseEvent e) {
        if (location != null) {
            location = null;
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseTrackListener#mouseHover(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseHover(MouseEvent e) {
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.MouseMoveListener#mouseMove(org.eclipse.swt.events.MouseEvent)
     */
    @Override
    public void mouseMove(MouseEvent e) {
        if (mouseDown) {
            location = new Point(e.x, e.y);
            updateLabel();
        }
    }

    /* (non-Javadoc)
     * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
     */
    @Override
    public void widgetDisposed(DisposeEvent e) {
        for (ChartCanvas canvas : decoratedCanvas) {
            if (canvas.getCanvas() == e.widget) {
                decoratedCanvas.remove(canvas);
                break;
            }
        }
    }
}