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/*******************************************************************************
* Copyright (c) 2012 CEA LIST.
*
* 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
*******************************************************************************/
package org.eclipse.papyrus.uml.diagram.timing.custom.figures;
import org.eclipse.draw2d.AbstractImageFigure;
import org.eclipse.draw2d.FigureUtilities;
import org.eclipse.draw2d.Graphics;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.FontMetrics;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Transform;
import org.eclipse.swt.widgets.Display;
public class VerticalLabel extends AbstractImageFigure {
private Image img;
private String myText;
private Font myImageFont;
private Color myForegroundColor;
private Color myBackgroundColor;
@Override
protected void paintFigure(final Graphics g) {
final Image image = getImage();
if(image != null) {
g.drawImage(image, this.bounds.x, this.bounds.y);
}
}
/** {@inheritDoc} */
@Override
public void addNotify() {
updateImage();
super.addNotify();
}
/** {@inheritDoc} */
@Override
public void removeNotify() {
if(this.img != null) {
this.img.dispose();
this.img = null;
}
super.removeNotify();
}
/** {@inheritDoc} */
public Image getImage() {
boolean update = false;
if(this.myImageFont != getFont()) {
this.myImageFont = getFont();
update = true;
}
if(needsUpdate(this.myForegroundColor, getForegroundColor())) {
this.myForegroundColor = getForegroundColor();
update = true;
}
if(needsUpdate(this.myBackgroundColor, getBackgroundColor())) {
this.myBackgroundColor = getBackgroundColor();
update = true;
}
if(update) {
updateImage();
}
return this.img;
}
/**
* Updates the image with the string provided.
*
* @param text
* to display
*/
public void setText(final String text) {
this.myText = text;
updateImage();
}
public String getText() {
return this.myText;
}
/**
* Redraws / creates the image of the rotated String.
*
* @return image created
*/
public void updateImage() {
if(this.img != null) {
this.img.dispose();
this.img = null;
}
if(getText() == null || getFont() == null) {
return;
}
setImage(createRotatedImageOfString(getText(), getFont(), getForegroundColor(), getBackgroundColor(), isOpaque()));
}
private void setImage(final Image image) {
if(this.img == image) {
return;
}
this.img = image;
revalidate();
notifyImageChanged();
repaint();
}
public static Image createRotatedImageOfString(final String string, final Font font, final Color foreground, final Color background, final boolean opaque) {
final Display display = Display.getDefault();
final FontMetrics metrics = FigureUtilities.getFontMetrics(font);
final Dimension strSize = FigureUtilities.getStringExtents(string, font);
final int height = strSize.width;
final int width = metrics.getAscent() + metrics.getDescent() + metrics.getLeading();
final ImageData data = new ImageData(width, height, 32, new PaletteData(0x0000ff00, 0x00ff0000, 0xff000000));
if(!opaque) {
data.transparentPixel = data.palette.getPixel(background.getRGB());
}
final Image image = new Image(display, data);
final GC gc = new GC(image);
gc.setFont(font);
gc.setBackground(background);
gc.fillRectangle(image.getBounds());
gc.setForeground(foreground);
final Transform transform = new Transform(Display.getCurrent());
transform.translate(0, height);
transform.rotate(-90);
gc.setTransform(transform);
gc.drawString(string, 0, 0, true);
gc.dispose();
return image;
}
private static final boolean needsUpdate(final Color cachedColor, final Color actualColor) {
if(cachedColor == null && actualColor == null) {
return false;
}
return cachedColor == null || !cachedColor.equals(actualColor);
}
@Override
public Dimension getPreferredSize(final int wHint, final int hHint) {
if(this.img != null) {
return new Rectangle(this.img.getBounds()).getSize();
}
return super.getPreferredSize(wHint, hHint);
}
}
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