Example #1
0
        /// <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();
            }
        }