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/*******************************************************************************
* Copyright (c) 2011 Google, Inc.
* 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:
* Google, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.wb.core.controls;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
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;
/**
* Simple control for displaying image and text.
*
* For unknown reason CLabel shows such things not very good - vertical text alignment is strange
* (bottom?).
*
* @author scheglov_ke
* @coverage core.control
*/
public class CImageLabel extends Canvas {
private static final int SPACE = 5;
private Image m_image;
private String m_text;
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public CImageLabel(Composite parent, int style) {
super(parent, style | SWT.NO_BACKGROUND);
addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
if (m_backImage != null) {
m_backImage.dispose();
m_backImage = null;
}
}
});
addListener(SWT.Paint, new Listener() {
public void handleEvent(Event event) {
doPaint(event.gc);
}
});
}
////////////////////////////////////////////////////////////////////////////
//
// Access
//
////////////////////////////////////////////////////////////////////////////
public Image getImage() {
return m_image;
}
public void setImage(Image image) {
m_image = image;
redraw();
}
public String getText() {
return m_text;
}
public void setText(String text) {
m_text = text;
redraw();
}
////////////////////////////////////////////////////////////////////////////
//
// Paint
//
////////////////////////////////////////////////////////////////////////////
private Image m_backImage;
private void doPaint(GC paintGC) {
Rectangle clientArea = getClientArea();
// prepare back image
GC gc;
{
if (m_backImage == null || !m_backImage.getBounds().equals(clientArea)) {
if (m_backImage != null) {
m_backImage.dispose();
}
m_backImage = new Image(getDisplay(), clientArea.width, clientArea.height);
}
//
gc = new GC(m_backImage);
gc.setBackground(paintGC.getBackground());
gc.setForeground(paintGC.getForeground());
gc.fillRectangle(clientArea);
}
//
Point textExtent = m_text == null ? new Point(0, 0) : gc.textExtent(m_text);
Rectangle imageBounds = m_image == null ? new Rectangle(0, 0, 0, 0) : m_image.getBounds();
//
if (m_image != null) {
int x = clientArea.x;
int y = clientArea.y + (clientArea.height - imageBounds.height) / 2;
gc.drawImage(m_image, x, y);
}
if (m_text != null) {
int x = clientArea.x + imageBounds.width + SPACE;
int y = clientArea.y + (clientArea.height - textExtent.y) / 2;
gc.drawText(m_text, x, y);
}
// flush back image
{
paintGC.drawImage(m_backImage, 0, 0);
gc.dispose();
}
}
@Override
public Point computeSize(int wHint, int hHint, boolean changed) {
// prepare text size
GC gc = new GC(this);
Point textExtent = m_text == null ? new Point(0, 0) : gc.textExtent(m_text);
gc.dispose();
// prepare image size
Rectangle imageBounds = m_image == null ? new Rectangle(0, 0, 0, 0) : m_image.getBounds();
// calculate control size
int width = imageBounds.width + SPACE + textExtent.x;
int height = Math.max(imageBounds.height, textExtent.y);
return new Point(width, height);
}
}
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