难道用户在使用键盘或鼠标离开WPF文本框？ [英] Did user use keyboard or mouse to leave WPF TextBox?

问题描述

我有文本框的 PreviewLostKeyboardFocus 事件的处理程序。当我使用键盘（Tab键）或鼠标（点击窗体上的另一个文本框）离开文本框它闪光。

I have a handler for the TextBox's PreviewLostKeyboardFocus event. It fires when I leave the TextBox using the keyboard (Tab key) or the mouse (by clicking on another TextBox on the form).

处理程序需要 KeyboardFocusChangedEventArgs ，其中有 KeyboardDevice ，名为属性，它不是空在两种情况下（我希望能找到<$ C $ 。C>空这里使用鼠标时）

The handler takes a KeyboardFocusChangedEventArgs, which has a property named KeyboardDevice, which isn't null in either scenario (I was hoping to find null here when using the mouse).

问：如何判断一个用户是否使用键盘或鼠标离开WPF的TextBox？

Question: How can I tell whether a user used the keyboard or the mouse to leave a WPF TextBox?

推荐答案

在 e.KeyboardDevice.GetKeyStates（Key.Tab）（其中e是类型KeyboardFocusChangedEventArgs的）报告：

The e.KeyboardDevice.GetKeyStates(Key.Tab) (where e is of type KeyboardFocusChangedEventArgs) reports:

• 无（当鼠标被用来改变焦点）


• 下，切换（当TAB是利用离开文本框）

• None (when mouse was used to change focus)
• Down, Toggled (when TAB was use to leave the TextBox)

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