Android6.0 按键流程（七）无线鼠标右键无效 -- Framework层

之前我们分析了无线鼠标右键无效，hal层的分析，我们可以把修改成返回键。

uint32_t CursorButtonAccumulator::getButtonState() const {  uint32_t result = 0;  if (mBtnLeft) {  result |= AMOTION_EVENT_BUTTON_PRIMARY;  }  if (mBtnRight) {  //result |= AMOTION_EVENT_BUTTON_SECONDARY;  result |= AMOTION_EVENT_BUTTON_BACK;//修改成返回键  }

但是具体AMOTION_EVENT_BUTTON_SECONDARY在哪里被过滤了，我们还没有分析到，现在我们来分析下鼠标按键机制的Framework层的分析，为什么之前的右键会被上层过滤？

我们先来看下ViewRootImpl.java这个文件，至于如何从hal层的按键进程，到Framework层的应用进程我们不分析了，之前的博客都分析过了。我们直接从鼠标处理的地方分析：

    final class ViewPostImeInputStage extends InputStage {public ViewPostImeInputStage(InputStage next) {super(next);}@Overrideprotected int onProcess(QueuedInputEvent q) {if (q.mEvent instanceof KeyEvent) {return processKeyEvent(q);//普通按键处理} else {// If delivering a new non-key event, make sure the window is// now allowed to start updating.handleDispatchWindowAnimationStopped();final int source = q.mEvent.getSource();if ((source & InputDevice.SOURCE_CLASS_POINTER) != 0) {return processPointerEvent(q);//鼠标按键处理} else if ((source & InputDevice.SOURCE_CLASS_TRACKBALL) != 0) {return processTrackballEvent(q);} else {return processGenericMotionEvent(q);}}}

ViewRootImpl文件处理按键消息会经过各个InputStage，而鼠标按键的处理是在ViewPostImeInputStage 和普通按键处理一样，会调用processPointerEvent来处理鼠标按键。

        private int processPointerEvent(QueuedInputEvent q) {final MotionEvent event = (MotionEvent)q.mEvent;mAttachInfo.mUnbufferedDispatchRequested = false;boolean handled = mView.dispatchPointerEvent(event);if (mAttachInfo.mUnbufferedDispatchRequested && !mUnbufferedInputDispatch) {mUnbufferedInputDispatch = true;if (mConsumeBatchedInputScheduled) {scheduleConsumeBatchedInputImmediately();}}return handled ? FINISH_HANDLED : FORWARD;}

processPointerEvent又调用了dispatchPointerEvent函数

    public final boolean dispatchPointerEvent(MotionEvent event) {if (event.isTouchEvent()) {return dispatchTouchEvent(event);//第一次鼠标按键进入这个函数} else {return dispatchGenericMotionEvent(event);}}

第一次鼠标按键进入dispatchTouchEvent这个函数

    public boolean dispatchTouchEvent(MotionEvent event) {// If the event should be handled by accessibility focus first.if (event.isTargetAccessibilityFocus()) {// We don't have focus or no virtual descendant has it, do not handle the event.if (!isAccessibilityFocusedViewOrHost()) {return false;}// We have focus and got the event, then use normal event dispatch.event.setTargetAccessibilityFocus(false);}boolean result = false;if (mInputEventConsistencyVerifier != null) {mInputEventConsistencyVerifier.onTouchEvent(event, 0);}final int actionMasked = event.getActionMasked();if (actionMasked == MotionEvent.ACTION_DOWN) {// Defensive cleanup for new gesturestopNestedScroll();}if (onFilterTouchEventForSecurity(event)) {//noinspection SimplifiableIfStatementListenerInfo li = mListenerInfo;if (li != null && li.mOnTouchListener != null&& (mViewFlags & ENABLED_MASK) == ENABLED&& li.mOnTouchListener.onTouch(this, event)) {result = true;}if (!result && onTouchEvent(event)) {//关键看onTouchEvent函数result = true;}}if (!result && mInputEventConsistencyVerifier != null) {mInputEventConsistencyVerifier.onUnhandledEvent(event, 0);}// Clean up after nested scrolls if this is the end of a gesture;// also cancel it if we tried an ACTION_DOWN but we didn't want the rest// of the gesture.if (actionMasked == MotionEvent.ACTION_UP ||actionMasked == MotionEvent.ACTION_CANCEL ||(actionMasked == MotionEvent.ACTION_DOWN && !result)) {stopNestedScroll();}return result;}

下面我们再来看下onTouchEvent函数，在对aciton进行分别处理，当是MotionEvent.ACTION_DOWN:会先调用performButtonActionOnTouchDown函数

    public boolean onTouchEvent(MotionEvent event) {......if (((viewFlags & CLICKABLE) == CLICKABLE ||(viewFlags & LONG_CLICKABLE) == LONG_CLICKABLE) ||(viewFlags & CONTEXT_CLICKABLE) == CONTEXT_CLICKABLE) {switch (action) {......case MotionEvent.ACTION_DOWN:mHasPerformedLongPress = false;if (performButtonActionOnTouchDown(event)) {break;}// Walk up the hierarchy to determine if we're inside a scrolling container.boolean isInScrollingContainer = isInScrollingContainer();// For views inside a scrolling container, delay the pressed feedback for// a short period in case this is a scroll.if (isInScrollingContainer) {mPrivateFlags |= PFLAG_PREPRESSED;if (mPendingCheckForTap == null) {mPendingCheckForTap = new CheckForTap();}mPendingCheckForTap.x = event.getX();mPendingCheckForTap.y = event.getY();Log.e(TAG, "kangchen postDelayed setPressed");postDelayed(mPendingCheckForTap, ViewConfiguration.getTapTimeout());} else {// Not inside a scrolling container, so show the feedback right awaysetPressed(true, x, y);Log.e(TAG, "kangchen setPressed");checkForLongClick(0);}break;......

主要是下面这个函数，当获取ButtonState是MotionEvent.BUTTON_SECONDARY，就返回true，而在onTouchEvent函数中当performButtonActionOnTouchDown返回true，就会执行break，下面代码就不执行了。也就是因为这个导致右键无效，具体代码这边就不继续跟下去了，比较复杂。

    protected boolean performButtonActionOnTouchDown(MotionEvent event) {if (event.getToolType(0) == MotionEvent.TOOL_TYPE_MOUSE &&(event.getButtonState() & MotionEvent.BUTTON_SECONDARY) != 0) {showContextMenu(event.getX(), event.getY(), event.getMetaState());mPrivateFlags |= PFLAG_CANCEL_NEXT_UP_EVENT;return true;//返回true}return false;}

这样我们就大致分析了Framework层把鼠标右键过滤的分析。

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Android6.0 按键流程（七）无线鼠标右键无效 -- Framework层

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