For a menu item, when we tab onto it, we want this element get 'focus' event, so that the submenu will show up. In the post, we will see how to achieve it by using JS+css, we will also see how to use 'nextElementSibling' to only focus the elemnt has…
在正文开始之前需要介绍一个人:Sean Sexton. 来自明尼苏达双城的软件工程师,对C#和WPF有着极深的热情.最为出色的是他维护了两个博客:2,000Things You Should Know About C# 和 2,000 Things You Should Know About WPF .他以类似微博式的150字简短语言来每天更新一条WPF和C#重要又容易被遗忘的知识.Follow他的博客也有一段日子了,很希望能够分享给大家. 本系列我不仅会翻译他的每一个tip,也会加入自己开发之…
上节我们大致了解了事件分发机制的内容,大概流程,这一节来分析下事件分发的源代码. 我们先来分析ViewGroup中dispatchTouchEvent()中的源码 public boolean dispatchTouchEvent(MotionEvent ev){ if (actionMasked == MotionEvent.ACTION_DOWN) { // Throw away all previous state when starting a new touch gesture. //…