/*
* Zooming
*/
@Override
public boolean onScaleBegin(SimpleScaleGestureDetector detector) {
if (mState == PanZoomState.ANIMATED_ZOOM) return false;
if (!mTarget.getZoomConstraints().getAllowZoom()) return false;
setState(PanZoomState.PINCHING);
mLastZoomFocus = new PointF(detector.getFocusX(), detector.getFocusY());
cancelTouch();
GeckoAppShell.sendEventToGecko(
GeckoEvent.createNativeGestureEvent(
GeckoEvent.ACTION_MAGNIFY_START, mLastZoomFocus, getMetrics().zoomFactor));
return true;
}
private boolean onTouchCancel(MotionEvent event) {
cancelTouch();
if (mState == PanZoomState.WAITING_LISTENERS) {
// we might get a cancel event from the TouchEventHandler while in the
// WAITING_LISTENERS state if the touch listeners prevent-default the
// block of events. at this point being in WAITING_LISTENERS is equivalent
// to being in NOTHING with the exception of possibly being in overscroll.
// so here we don't want to do anything right now; the overscroll will be
// corrected in preventedTouchFinished().
return false;
}
// ensure we snap back if we're overscrolled
bounce();
return false;
}
private boolean onTouchMove(MotionEvent event) {
switch (mState) {
case FLING:
case BOUNCE:
case WAITING_LISTENERS:
// should never happen
Log.e(LOGTAG, "Received impossible touch move while in " + mState);
// fall through
case ANIMATED_ZOOM:
case NOTHING:
// may happen if user double-taps and drags without lifting after the
// second tap. ignore the move if this happens.
return false;
case TOUCHING:
if (panDistance(event) < PAN_THRESHOLD) {
return false;
}
cancelTouch();
startPanning(event.getX(0), event.getY(0), event.getEventTime());
track(event);
return true;
case PANNING_HOLD_LOCKED:
setState(PanZoomState.PANNING_LOCKED);
// fall through
case PANNING_LOCKED:
track(event);
return true;
case PANNING_HOLD:
setState(PanZoomState.PANNING);
// fall through
case PANNING:
track(event);
return true;
case PINCHING:
// scale gesture listener will handle this
return false;
}
Log.e(LOGTAG, "Unhandled case " + mState + " in onTouchMove");
return false;
}