/** This function must be called from the UI thread. */
public void abortAnimation() {
checkMainThread();
// this happens when gecko changes the viewport on us or if the device is rotated.
// if that's the case, abort any animation in progress and re-zoom so that the page
// snaps to edges. for other cases (where the user's finger(s) are down) don't do
// anything special.
switch (mState) {
case FLING:
mX.stopFling();
mY.stopFling();
// fall through
case BOUNCE:
case ANIMATED_ZOOM:
// the zoom that's in progress likely makes no sense any more (such as if
// the screen orientation changed) so abort it
setState(PanZoomState.NOTHING);
// fall through
case NOTHING:
// Don't do animations here; they're distracting and can cause flashes on page
// transitions.
synchronized (mTarget.getLock()) {
mTarget.setViewportMetrics(getValidViewportMetrics());
}
break;
}
}
private void finishAnimation() {
checkMainThread();
stopAnimationTimer();
// Force a viewport synchronisation
mTarget.setForceRedraw();
}
/** This function must be called on the UI thread. */
public void preventedTouchFinished() {
checkMainThread();
if (mState == PanZoomState.WAITING_LISTENERS) {
// if we enter here, we just finished a block of events whose default actions
// were prevented by touch listeners. Now there are no touch points left, so
// we need to reset our state and re-bounce because we might be in overscroll
bounce();
}
}
/** This function must be called on the UI thread. */
public void startingNewEventBlock(MotionEvent event, boolean waitingForTouchListeners) {
checkMainThread();
mSubscroller.cancel();
if (waitingForTouchListeners
&& (event.getAction() & MotionEvent.ACTION_MASK) == MotionEvent.ACTION_DOWN) {
// this is the first touch point going down, so we enter the pending state
// seting the state will kill any animations in progress, possibly leaving
// the page in overscroll
setState(PanZoomState.WAITING_LISTENERS);
}
}
public PanZoomController(PanZoomTarget target, EventDispatcher eventDispatcher) {
mTarget = target;
mSubscroller = new SubdocumentScrollHelper(this, eventDispatcher);
mX = new AxisX(mSubscroller);
mY = new AxisY(mSubscroller);
mMainThread = GeckoApp.mAppContext.getMainLooper().getThread();
checkMainThread();
setState(PanZoomState.NOTHING);
mEventDispatcher = eventDispatcher;
registerEventListener(MESSAGE_ZOOM_RECT);
registerEventListener(MESSAGE_ZOOM_PAGE);
Axis.initPrefs();
}
/** This function must be called from the UI thread. */
public void abortPanning() {
checkMainThread();
bounce();
}