SystemGesturesPointerEventListenerpublic class SystemGesturesPointerEventListener extends Object implements android.view.WindowManagerPolicy.PointerEventListener
| Fields Summary |
|---|
| private static final String | TAG | | private static final boolean | DEBUG | | private static final long | SWIPE_TIMEOUT_MS | | private static final int | MAX_TRACKED_POINTERS | | private static final int | UNTRACKED_POINTER | | private static final int | SWIPE_NONE | | private static final int | SWIPE_FROM_TOP | | private static final int | SWIPE_FROM_BOTTOM | | private static final int | SWIPE_FROM_RIGHT | | private final int | mSwipeStartThreshold | | private final int | mSwipeDistanceThreshold | | private final Callbacks | mCallbacks | | private final int[] | mDownPointerId | | private final float[] | mDownX | | private final float[] | mDownY | | private final long[] | mDownTime | | int | screenHeight | | int | screenWidth | | private int | mDownPointers | | private boolean | mSwipeFireable | | private boolean | mDebugFireable |
| Constructors Summary |
|---|
public SystemGesturesPointerEventListener(android.content.Context context, Callbacks callbacks)
mCallbacks = checkNull("callbacks", callbacks);
mSwipeStartThreshold = checkNull("context", context).getResources()
.getDimensionPixelSize(com.android.internal.R.dimen.status_bar_height);
mSwipeDistanceThreshold = mSwipeStartThreshold;
if (DEBUG) Slog.d(TAG, "mSwipeStartThreshold=" + mSwipeStartThreshold
+ " mSwipeDistanceThreshold=" + mSwipeDistanceThreshold);
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| Methods Summary |
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| private void | captureDown(android.view.MotionEvent event, int pointerIndex)
final int pointerId = event.getPointerId(pointerIndex);
final int i = findIndex(pointerId);
if (DEBUG) Slog.d(TAG, "pointer " + pointerId +
" down pointerIndex=" + pointerIndex + " trackingIndex=" + i);
if (i != UNTRACKED_POINTER) {
mDownX[i] = event.getX(pointerIndex);
mDownY[i] = event.getY(pointerIndex);
mDownTime[i] = event.getEventTime();
if (DEBUG) Slog.d(TAG, "pointer " + pointerId +
" down x=" + mDownX[i] + " y=" + mDownY[i]);
}
| | private static T | checkNull(java.lang.String name, T arg)
if (arg == null) {
throw new IllegalArgumentException(name + " must not be null");
}
return arg;
| | private int | detectSwipe(android.view.MotionEvent move)
final int historySize = move.getHistorySize();
final int pointerCount = move.getPointerCount();
for (int p = 0; p < pointerCount; p++) {
final int pointerId = move.getPointerId(p);
final int i = findIndex(pointerId);
if (i != UNTRACKED_POINTER) {
for (int h = 0; h < historySize; h++) {
final long time = move.getHistoricalEventTime(h);
final float x = move.getHistoricalX(p, h);
final float y = move.getHistoricalY(p, h);
final int swipe = detectSwipe(i, time, x, y);
if (swipe != SWIPE_NONE) {
return swipe;
}
}
final int swipe = detectSwipe(i, move.getEventTime(), move.getX(p), move.getY(p));
if (swipe != SWIPE_NONE) {
return swipe;
}
}
}
return SWIPE_NONE;
| | private int | detectSwipe(int i, long time, float x, float y)
final float fromX = mDownX[i];
final float fromY = mDownY[i];
final long elapsed = time - mDownTime[i];
if (DEBUG) Slog.d(TAG, "pointer " + mDownPointerId[i]
+ " moved (" + fromX + "->" + x + "," + fromY + "->" + y + ") in " + elapsed);
if (fromY <= mSwipeStartThreshold
&& y > fromY + mSwipeDistanceThreshold
&& elapsed < SWIPE_TIMEOUT_MS) {
return SWIPE_FROM_TOP;
}
if (fromY >= screenHeight - mSwipeStartThreshold
&& y < fromY - mSwipeDistanceThreshold
&& elapsed < SWIPE_TIMEOUT_MS) {
return SWIPE_FROM_BOTTOM;
}
if (fromX >= screenWidth - mSwipeStartThreshold
&& x < fromX - mSwipeDistanceThreshold
&& elapsed < SWIPE_TIMEOUT_MS) {
return SWIPE_FROM_RIGHT;
}
return SWIPE_NONE;
| | private int | findIndex(int pointerId)
for (int i = 0; i < mDownPointers; i++) {
if (mDownPointerId[i] == pointerId) {
return i;
}
}
if (mDownPointers == MAX_TRACKED_POINTERS || pointerId == MotionEvent.INVALID_POINTER_ID) {
return UNTRACKED_POINTER;
}
mDownPointerId[mDownPointers++] = pointerId;
return mDownPointers - 1;
| | public void | onPointerEvent(android.view.MotionEvent event)
switch (event.getActionMasked()) {
case MotionEvent.ACTION_DOWN:
mSwipeFireable = true;
mDebugFireable = true;
mDownPointers = 0;
captureDown(event, 0);
break;
case MotionEvent.ACTION_POINTER_DOWN:
captureDown(event, event.getActionIndex());
if (mDebugFireable) {
mDebugFireable = event.getPointerCount() < 5;
if (!mDebugFireable) {
if (DEBUG) Slog.d(TAG, "Firing debug");
mCallbacks.onDebug();
}
}
break;
case MotionEvent.ACTION_MOVE:
if (mSwipeFireable) {
final int swipe = detectSwipe(event);
mSwipeFireable = swipe == SWIPE_NONE;
if (swipe == SWIPE_FROM_TOP) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromTop");
mCallbacks.onSwipeFromTop();
} else if (swipe == SWIPE_FROM_BOTTOM) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromBottom");
mCallbacks.onSwipeFromBottom();
} else if (swipe == SWIPE_FROM_RIGHT) {
if (DEBUG) Slog.d(TAG, "Firing onSwipeFromRight");
mCallbacks.onSwipeFromRight();
}
}
break;
case MotionEvent.ACTION_UP:
case MotionEvent.ACTION_CANCEL:
mSwipeFireable = false;
mDebugFireable = false;
break;
default:
if (DEBUG) Slog.d(TAG, "Ignoring " + event);
}
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