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package org.eclipse.mylyn.internal.tasks.ui.editors;
import java.util.Timer;
import java.util.TimerTask;
import org.eclipse.mylyn.internal.tasks.ui.TasksUiImages;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.internal.WorkbenchPlugin;
/**
* @author Shawn Minto
*/
public class EditorBusyIndicator {
private boolean showingBusy = false;
private Image[] images;
private TimerTask animateTask;
private IBusyEditor editor;
private Image oldImage;
public EditorBusyIndicator(IBusyEditor editor) {
this.editor = editor;
}
/**
* Stop showing the busy cursor.
*/
public void stopBusy() {
if (!showingBusy || isDisposed())
return;
showingBusy = false;
if (animateTask != null) {
animateTask.cancel();
animateTask = null;
}
updateTitleImage(oldImage);
}
/**
* Start the busy indication.
*/
public void startBusy() {
if (showingBusy || isDisposed())
return;
showingBusy = true;
oldImage = editor.getTitleImage();
try {
if (images == null) {
images = TasksUiImages.getProgressImages();// If we fail to
// load do not
// continue
if (images == null) {
showingBusy = false;
return;
}
}
if (images.length > 1) {
Timer animateTimer = new Timer();
if (animateTask == null)
animateTimer.schedule(getTimerTask(), 0);
}
} catch (SWTException ex) {
WorkbenchPlugin.log(ex);
}
}
/**
* Get the timer task for the receiver.
*
* @param background
* @param display
* @return TimerTask
*/
private TimerTask getTimerTask() {
animateTask = new TimerTask() {
@Override
public void run() {
try {
int imageDataIndex = 0;
Image image = images[imageDataIndex];
while (showingBusy) {
updateTitleImage(image);
imageDataIndex = (imageDataIndex + 1) % images.length;
image = images[imageDataIndex];
try {
Thread.sleep(90);
} catch (InterruptedException e) {
}
if (images == null)
return;
}
} catch (SWTException ex) {
WorkbenchPlugin.log(ex);
} catch (NullPointerException e) {
// we will get this if the timer continues to run after the
// images have been disposed
} finally {
}
}
};
return animateTask;
}
private void updateTitleImage(final Image image) {
if (PlatformUI.getWorkbench().isClosing()) {
return;
} else {
PlatformUI.getWorkbench().getDisplay().syncExec(new Runnable() {
public void run() {
if ((image == null || !image.isDisposed()) && !isDisposed() && showingBusy) {
editor.setTitleImage(image);
} else {
if (oldImage != null && !oldImage.isDisposed()) {
editor.setTitleImage(oldImage);
}
}
}
});
}
}
private boolean isDisposed = false;
public void dispose() {
if (!isDisposed) {
if (animateTask != null)
animateTask.cancel();
// if (images != null) {
// for (int i = 0; i < images.length; i++) {
// images[i].dispose();
// }
// }
// images = null;
isDisposed = true;
}
}
public boolean isDisposed() {
return isDisposed;
}
}
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