问题描述
我需要在 Inline
元素 (System.Windows.Documents.Run
) 上捕获键盘事件。在下面的示例中,所有鼠标事件都有效,但没有任何键盘事件。
为什么没有触发键盘事件?
private Run CreateWord(string text)
{
var word = new Run(text);
// Works as expected
word.MouseDown += Word_MouseDown;
word.MouseEnter += Word_MouseEnter;
word.MouseLeave += Word_MouseLeave;
// Does not work. No keyboard events are fired
word.PreviewKeyUp += Word_KeyUp;
word.KeyDown += Word_KeyDown;
word.AddHandler(UIElement.KeyDownEvent,new KeyEventHandler(delegate (object sender,KeyEventArgs e)
{
Debug.WriteLine("AddHandler KeyDown");
}),true);
return word;
}
private void Word_KeyDown(object sender,KeyEventArgs e)
{
Debug.WriteLine("KeyDown");
}
private void Word_KeyUp(object sender,KeyEventArgs e)
{
Debug.WriteLine("KeyUp");
}
解决方法
AddHandler 差不多就到这里了。您只需要在 AddHandler
控件上调用 RichTextBox
。
RichTextBox
正在处理 KeyDown
事件,因此该事件没有到达您的 Run
。
这样的东西...
private Run CreateWord(string text)
{
var word = new Run(text);
// Works as expected
word.MouseDown += Word_MouseDown;
word.MouseEnter += Word_MouseEnter;
word.MouseLeave += Word_MouseLeave;
RichTextBox.AddHandler(KeyDownEvent,new KeyEventHandler(delegate (object sender,KeyEventArgs e)
{
Debug.WriteLine($"AddHandler KeyDown - {word.Text}");
}),true);
return word;
}