/**
* Checks for an auto scroll event. This should be called when a drag & drop operation is in
* progress and the drop target is inside a scroll pane.
*
* @param evt the mouse event which should be checked.
* @return true if auto scrolling is started/active.
* @see #stopAutoScroll()
*/
public boolean checkAutoScroll(Event evt) {
GUI gui = getGUI();
if (gui == null) {
stopAutoScroll();
return false;
}
autoScrollDirection = getAutoScrollDirection(evt);
if (autoScrollDirection == 0) {
stopAutoScroll();
return false;
}
setAutoScrollMarker();
if (autoScrollTimer == null) {
autoScrollTimer = gui.createTimer();
autoScrollTimer.setContinuous(true);
autoScrollTimer.setDelay(AUTO_SCROLL_DELAY);
autoScrollTimer.setCallback(
new Runnable() {
public void run() {
doAutoScroll();
}
});
doAutoScroll();
}
autoScrollTimer.start();
return true;
}
