private void track(MotionEvent event) {
mX.saveTouchPos();
mY.saveTouchPos();
for (int i = 0; i < event.getHistorySize(); i++) {
track(
event.getHistoricalX(0, i), event.getHistoricalY(0, i), event.getHistoricalEventTime(i));
}
track(event.getX(0), event.getY(0), event.getEventTime());
if (stopped()) {
if (mState == PanZoomState.PANNING) {
setState(PanZoomState.PANNING_HOLD);
} else if (mState == PanZoomState.PANNING_LOCKED) {
setState(PanZoomState.PANNING_HOLD_LOCKED);
} else {
// should never happen, but handle anyway for robustness
Log.e(LOGTAG, "Impossible case " + mState + " when stopped in track");
setState(PanZoomState.PANNING_HOLD_LOCKED);
}
}
mX.startPan();
mY.startPan();
updatePosition();
}
/** 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 fling() {
updatePosition();
stopAnimationTimer();
boolean stopped = stopped();
mX.startFling(stopped);
mY.startFling(stopped);
startAnimationTimer(new FlingRunnable());
}
private void track(float x, float y, long time) {
float timeDelta = (float) (time - mLastEventTime);
if (FloatUtils.fuzzyEquals(timeDelta, 0)) {
// probably a duplicate event, ignore it. using a zero timeDelta will mess
// up our velocity
return;
}
mLastEventTime = time;
mX.updateWithTouchAt(x, timeDelta);
mY.updateWithTouchAt(y, timeDelta);
}
private void updatePosition() {
mX.displace();
mY.displace();
PointF displacement = resetDisplacement();
if (FloatUtils.fuzzyEquals(displacement.x, 0.0f)
&& FloatUtils.fuzzyEquals(displacement.y, 0.0f)) {
return;
}
if (!mSubscroller.scrollBy(displacement)) {
synchronized (mTarget.getLock()) {
scrollBy(displacement.x, displacement.y);
}
}
}
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();
}
private void startPanning(float x, float y, long time) {
float dx = mX.panDistance(x);
float dy = mY.panDistance(y);
double angle = Math.atan2(dy, dx); // range [-pi, pi]
angle = Math.abs(angle); // range [0, pi]
// When the touch move breaks through the pan threshold, reposition the touch down origin
// so the page won't jump when we start panning.
mX.startTouch(x);
mY.startTouch(y);
mLastEventTime = time;
if (!mX.scrollable() || !mY.scrollable()) {
setState(PanZoomState.PANNING);
} else if (angle < AXIS_LOCK_ANGLE || angle > (Math.PI - AXIS_LOCK_ANGLE)) {
mY.setScrollingDisabled(true);
setState(PanZoomState.PANNING_LOCKED);
} else if (Math.abs(angle - (Math.PI / 2)) < AXIS_LOCK_ANGLE) {
mX.setScrollingDisabled(true);
setState(PanZoomState.PANNING_LOCKED);
} else {
setState(PanZoomState.PANNING);
}
}
@Override
public boolean onScale(SimpleScaleGestureDetector detector) {
if (GeckoApp.mAppContext == null || GeckoApp.mAppContext.mDOMFullScreen) return false;
if (mState != PanZoomState.PINCHING) return false;
float prevSpan = detector.getPreviousSpan();
if (FloatUtils.fuzzyEquals(prevSpan, 0.0f)) {
// let's eat this one to avoid setting the new zoom to infinity (bug 711453)
return true;
}
float spanRatio = detector.getCurrentSpan() / prevSpan;
/*
* Apply edge resistance if we're zoomed out smaller than the page size by scaling the zoom
* factor toward 1.0.
*/
float resistance = Math.min(mX.getEdgeResistance(true), mY.getEdgeResistance(true));
if (spanRatio > 1.0f) spanRatio = 1.0f + (spanRatio - 1.0f) * resistance;
else spanRatio = 1.0f - (1.0f - spanRatio) * resistance;
synchronized (mTarget.getLock()) {
float newZoomFactor = getMetrics().zoomFactor * spanRatio;
float minZoomFactor = 0.0f;
float maxZoomFactor = MAX_ZOOM;
ZoomConstraints constraints = mTarget.getZoomConstraints();
if (constraints.getMinZoom() > 0) minZoomFactor = constraints.getMinZoom();
if (constraints.getMaxZoom() > 0) maxZoomFactor = constraints.getMaxZoom();
if (newZoomFactor < minZoomFactor) {
// apply resistance when zooming past minZoomFactor,
// such that it asymptotically reaches minZoomFactor / 2.0
// but never exceeds that
final float rate = 0.5f; // controls how quickly we approach the limit
float excessZoom = minZoomFactor - newZoomFactor;
excessZoom = 1.0f - (float) Math.exp(-excessZoom * rate);
newZoomFactor = minZoomFactor * (1.0f - excessZoom / 2.0f);
}
if (newZoomFactor > maxZoomFactor) {
// apply resistance when zooming past maxZoomFactor,
// such that it asymptotically reaches maxZoomFactor + 1.0
// but never exceeds that
float excessZoom = newZoomFactor - maxZoomFactor;
excessZoom = 1.0f - (float) Math.exp(-excessZoom);
newZoomFactor = maxZoomFactor + excessZoom;
}
scrollBy(mLastZoomFocus.x - detector.getFocusX(), mLastZoomFocus.y - detector.getFocusY());
PointF focus = new PointF(detector.getFocusX(), detector.getFocusY());
scaleWithFocus(newZoomFactor, focus);
}
mLastZoomFocus.set(detector.getFocusX(), detector.getFocusY());
GeckoEvent event =
GeckoEvent.createNativeGestureEvent(
GeckoEvent.ACTION_MAGNIFY, mLastZoomFocus, getMetrics().zoomFactor);
GeckoAppShell.sendEventToGecko(event);
return true;
}
PointF resetDisplacement() {
return new PointF(mX.resetDisplacement(), mY.resetDisplacement());
}
public PointF getVelocityVector() {
return new PointF(mX.getRealVelocity(), mY.getRealVelocity());
}
private float getVelocity() {
float xvel = mX.getRealVelocity();
float yvel = mY.getRealVelocity();
return FloatMath.sqrt(xvel * xvel + yvel * yvel);
}
private float panDistance(MotionEvent move) {
float dx = mX.panDistance(move.getX(0));
float dy = mY.panDistance(move.getY(0));
return FloatMath.sqrt(dx * dx + dy * dy);
}
private void startTouch(float x, float y, long time) {
mX.startTouch(x);
mY.startTouch(y);
setState(PanZoomState.TOUCHING);
mLastEventTime = time;
}
public int getOverScrollMode() {
return mX.getOverScrollMode();
}
public void setOverScrollMode(int overscrollMode) {
mX.setOverScrollMode(overscrollMode);
mY.setOverScrollMode(overscrollMode);
}