title.java

eclise rcp 项目,是非常好的学习源码

/*******************************************************************************
 * Copyright (c) 2007 Siemens AG
 * 
 * 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:
 *    Kai T鰀ter - initial API and implementation
 *******************************************************************************/

package com.siemens.ct.mp3m.ui.presentation;

import org.eclipse.jface.resource.JFaceResources;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseAdapter;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.events.MouseListener;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.presentations.IPresentablePart;
import org.eclipse.ui.presentations.IStackPresentationSite;

public class Title extends AbstractClosable {
    private IStackPresentationSite site;

    Color colorTop = new Color(getDisplay(), 135, 135, 135);

    Color colorBottom = new Color(getDisplay(), 50, 50, 50);

    Color colorText = new Color(getDisplay(), 255, 255, 255);

    protected Font font = new Font(getDisplay(), "Default", 10, SWT.BOLD);

    /**
     * This listener responds to selection events in all tab buttons.
     */
    private MouseListener mouseListener = new MouseAdapter() {
        public void mouseDown(MouseEvent e) {
            if (part != null) {
                part.setFocus();
                if (isCloseSelected) {
                    site.close(new IPresentablePart[] { part });
                }
            }
        }
    };

    public Title(Composite parent, int style, IStackPresentationSite site) {
        super(parent, style | SWT.NO_BACKGROUND);
        this.site = site;
        addPaintListener(this);
        addMouseListener(mouseListener);
    }

    /**
     * Paint the title
     */
    public void paintControl(PaintEvent e) {
        Rectangle clientArea = getBounds();
        Image img = new Image(e.display, clientArea.width, clientArea.height);
        GC gc = new GC(img);

        gc.setForeground(colorTop);
        gc.setBackground(colorBottom);
        gc.fillGradientRectangle(0, 0, clientArea.width, clientArea.height, true);

        if (part != null) {
            gc.setFont(JFaceResources.getBannerFont());
            gc.setForeground(colorText);
            String dirty = "";
            if (part.isDirty()) {
                dirty = "*";
            }
            String text = shortenText(gc,dirty + part.getTitle(), clientArea.width - 30);
            gc.drawText(text, 5, 2, true);

            if (part.isCloseable()) {
                if (isCloseSelected) {
                    gc.drawImage(closeSelectedImage, clientArea.width - 20, 2);
                } else {
                    gc.drawImage(closeUnselectedImage, clientArea.width - 20, 2);
                }
            }
        }

        e.gc.drawImage(img, 0, 0);
        gc.dispose();
        img.dispose();
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.swt.widgets.Widget#dispose()
     */
    @Override
    public void dispose() {
        colorTop.dispose();
        colorBottom.dispose();
        colorText.dispose();
        font.dispose();
        super.dispose();
    }

}