/// <summary>Checks a touch event.</summary> /// <remarks>Checks a touch event.</remarks> /// <param name="event">The event.</param> /// <param name="nestingLevel"> /// The nesting level: 0 if called from the base class, /// or 1 from a subclass. If the event was already checked by this consistency verifier /// at a higher nesting level, it will not be checked again. Used to handle the situation /// where a subclass dispatching method delegates to its superclass's dispatching method /// and both dispatching methods call into the consistency verifier. /// </param> public void onTouchEvent(android.view.MotionEvent @event, int nestingLevel) { if (!startEvent(@event, nestingLevel, EVENT_TYPE_TOUCH)) { return; } int action = @event.getAction(); bool newStream = action == android.view.MotionEvent.ACTION_DOWN || action == android.view.MotionEvent .ACTION_CANCEL; if (newStream && (mTouchEventStreamIsTainted || mTouchEventStreamUnhandled)) { mTouchEventStreamIsTainted = false; mTouchEventStreamUnhandled = false; mTouchEventStreamPointers = 0; } if (mTouchEventStreamIsTainted) { @event.setTainted(true); } try { ensureMetaStateIsNormalized(@event.getMetaState()); int deviceId = @event.getDeviceId(); int source = @event.getSource(); if (!newStream && mTouchEventStreamDeviceId != -1 && (mTouchEventStreamDeviceId != deviceId || mTouchEventStreamSource != source)) { problem("Touch event stream contains events from multiple sources: " + "previous device id " + mTouchEventStreamDeviceId + ", previous source " + Sharpen.Util.IntToHexString (mTouchEventStreamSource) + ", new device id " + deviceId + ", new source " + Sharpen.Util.IntToHexString (source)); } mTouchEventStreamDeviceId = deviceId; mTouchEventStreamSource = source; int pointerCount = @event.getPointerCount(); if ((source & android.view.InputDevice.SOURCE_CLASS_POINTER) != 0) { switch (action) { case android.view.MotionEvent.ACTION_DOWN: { if (mTouchEventStreamPointers != 0) { problem("ACTION_DOWN but pointers are already down. " + "Probably missing ACTION_UP from previous gesture." ); } ensureHistorySizeIsZeroForThisAction(@event); ensurePointerCountIsOneForThisAction(@event); mTouchEventStreamPointers = 1 << @event.getPointerId(0); break; } case android.view.MotionEvent.ACTION_UP: { ensureHistorySizeIsZeroForThisAction(@event); ensurePointerCountIsOneForThisAction(@event); mTouchEventStreamPointers = 0; mTouchEventStreamIsTainted = false; break; } case android.view.MotionEvent.ACTION_MOVE: { int expectedPointerCount = Sharpen.Util.IntGetBitCount(mTouchEventStreamPointers); if (pointerCount != expectedPointerCount) { problem("ACTION_MOVE contained " + pointerCount + " pointers but there are currently " + expectedPointerCount + " pointers down."); mTouchEventStreamIsTainted = true; } break; } case android.view.MotionEvent.ACTION_CANCEL: { mTouchEventStreamPointers = 0; mTouchEventStreamIsTainted = false; break; } case android.view.MotionEvent.ACTION_OUTSIDE: { if (mTouchEventStreamPointers != 0) { problem("ACTION_OUTSIDE but pointers are still down."); } ensureHistorySizeIsZeroForThisAction(@event); ensurePointerCountIsOneForThisAction(@event); mTouchEventStreamIsTainted = false; break; } default: { int actionMasked = @event.getActionMasked(); int actionIndex = @event.getActionIndex(); if (actionMasked == android.view.MotionEvent.ACTION_POINTER_DOWN) { if (mTouchEventStreamPointers == 0) { problem("ACTION_POINTER_DOWN but no other pointers were down."); mTouchEventStreamIsTainted = true; } if (actionIndex < 0 || actionIndex >= pointerCount) { problem("ACTION_POINTER_DOWN index is " + actionIndex + " but the pointer count is " + pointerCount + "."); mTouchEventStreamIsTainted = true; } else { int id = @event.getPointerId(actionIndex); int idBit = 1 << id; if ((mTouchEventStreamPointers & idBit) != 0) { problem("ACTION_POINTER_DOWN specified pointer id " + id + " which is already down." ); mTouchEventStreamIsTainted = true; } else { mTouchEventStreamPointers |= idBit; } } ensureHistorySizeIsZeroForThisAction(@event); } else { if (actionMasked == android.view.MotionEvent.ACTION_POINTER_UP) { if (actionIndex < 0 || actionIndex >= pointerCount) { problem("ACTION_POINTER_UP index is " + actionIndex + " but the pointer count is " + pointerCount + "."); mTouchEventStreamIsTainted = true; } else { int id = @event.getPointerId(actionIndex); int idBit = 1 << id; if ((mTouchEventStreamPointers & idBit) == 0) { problem("ACTION_POINTER_UP specified pointer id " + id + " which is not currently down." ); mTouchEventStreamIsTainted = true; } else { mTouchEventStreamPointers &= ~idBit; } } ensureHistorySizeIsZeroForThisAction(@event); } else { problem("Invalid action " + android.view.MotionEvent.actionToString(action) + " for touch event." ); } } break; } } } else { problem("Source was not SOURCE_CLASS_POINTER."); } } finally { finishEvent(); } }