/**
* Starts this updater. This method initializes all the necessary resources and puts this {@link
* Runnable} on the asynch queue. If this updater is not active or is already running, this
* method just returns.
*/
public void start() {
if (!isActive() || isRunning()) return;
isRunning = true;
setDirty(false);
resetTileValues();
if (!targetSize.equals(thumbnailImageSize)) {
resetThumbnailImage();
}
if (targetSize.isEmpty()) return;
thumbnailGC =
new GC(thumbnailImage, sourceFigure.isMirrored() ? SWT.RIGHT_TO_LEFT : SWT.NONE);
thumbnailGraphics = new ScaledGraphics(new SWTGraphics(thumbnailGC));
thumbnailGraphics.scale(getScaleX());
thumbnailGraphics.translate(getSourceRectangle().getLocation().negate());
Color color = sourceFigure.getForegroundColor();
if (color != null) thumbnailGraphics.setForegroundColor(color);
color = sourceFigure.getBackgroundColor();
if (color != null) thumbnailGraphics.setBackgroundColor(color);
thumbnailGraphics.setFont(sourceFigure.getFont());
setScales(
targetSize.width / (float) getSourceRectangle().width,
targetSize.height / (float) getSourceRectangle().height);
Display.getCurrent().asyncExec(this);
}
/**
* Updates the current tile on the Thumbnail. An area of the source Figure is painted to an
* {@link Image}. That Image is then drawn on the Thumbnail. Scaling of the source Image is done
* inside {@link GC#drawImage(Image, int, int, int, int, int, int, int, int)} since the source
* and target sizes are different. The current tile indexes are incremented and if more updating
* is necesary, this {@link Runnable} is called again in a {@link Display#timerExec(int,
* Runnable)}. If no more updating is required, {@link #stop()} is called.
*/
public void run() {
if (!isActive() || !isRunning()) return;
int v = getCurrentVTile();
int sy1 = v * tileSize.height;
int sy2 = Math.min((v + 1) * tileSize.height, getSourceRectangle().height);
int h = getCurrentHTile();
int sx1 = h * tileSize.width;
int sx2 = Math.min((h + 1) * tileSize.width, getSourceRectangle().width);
com.architexa.org.eclipse.draw2d.geometry.Point p = getSourceRectangle().getLocation();
Rectangle rect = new Rectangle(sx1 + p.x, sy1 + p.y, sx2 - sx1, sy2 - sy1);
thumbnailGraphics.pushState();
thumbnailGraphics.setClip(rect);
thumbnailGraphics.fillRectangle(rect);
sourceFigure.paint(thumbnailGraphics);
thumbnailGraphics.popState();
if (getCurrentHTile() < (hTiles - 1)) setCurrentHTile(getCurrentHTile() + 1);
else {
setCurrentHTile(0);
if (getCurrentVTile() < (vTiles - 1)) setCurrentVTile(getCurrentVTile() + 1);
else setCurrentVTile(0);
}
if (getCurrentHTile() != 0 || getCurrentVTile() != 0) Display.getCurrent().asyncExec(this);
else if (isDirty()) {
setDirty(false);
Display.getCurrent().asyncExec(this);
repaint();
} else {
stop();
repaint();
}
}
/**
* Stops this updater. Also disposes of resources (except the thumbnail image which is still
* needed for painting).
*/
public void stop() {
isRunning = false;
if (thumbnailGC != null) {
thumbnailGC.dispose();
thumbnailGC = null;
}
if (thumbnailGraphics != null) {
thumbnailGraphics.dispose();
thumbnailGraphics = null;
}
// Don't dispose of the thumbnail image since it is needed to paint the
// figure when the source is not dirty (i.e. showing/hiding the dock).
}
