mFirstTouchTarget是什么

第10-22 行: 每个 ViewGroup 都会带有 mFirstTouchTarget 变量,这个变量只有在 ACTION_DOWN 事件时才能设置,这个能从第 28 行的 if 语句看出来,因为设置 mFirs...

1.递归查找touchTarget,并标记在ViewGroup的mFirstTouchTarget,整个流程下来,会生成一个touchTarget的链表,示例如下:若CustomView在onTouchEvent返回true,则生成的touch...

TouchTarget target = mFirstTouchTarget; while (target != null) { final TouchTarget next = target.next; if(alreadyDispatchedToNewTouchTarget && target==...

newTouchTarget = mFirstTouchTarget; while (newTouchTarget.next != null) { newTouchTarget = newTouchTarget.next; } newTouchTarget.pointerIdBits |= id...

首先这里先判断事件是否为DOWN事件,如果是,则初始化,把mFirstTouchTarget置为null。由于一个完整的事件序列是以DOWN开始,以UP结束,所以如果是DOWN事件,那么说明是一...

final boolean intercepted; if (actionMasked == MotionEvent.ACTION_DOWN || mFirstTouchTarget != null) { // 标记事件不允许被拦截, 默认是`fa...

{ //清除之前的手势 cancelAndClearTouchTargets(ev); resetTouchState();//核心操作mFirstTouchTarget=null } //检查是否拦截touch事件 final boolean intercepted...

if (mFirstTouchTarget == null) { // ViewGroup处理 handled = dispatchTransformedTouchEvent(ev, canceled, null, TouchTarget.ALL_POINTER_IDS); } else {...

TouchTarget predecessor = null; TouchTarget target = mFirstTouchTarget; while (target != null) { final TouchTarget next = target.next; //若已被处理,...