如何检测wpf中的多个按键按下onkeydown事件? [英] How to detect multiple keys down onkeydown event in wpf?

问题描述

我不想检测任何双键组合，所以像

I don't want to detect any double key combination, so solutions like

if(Keyboard.IsKeyDown(specificKey)){

}

不会工作，当然，除非我会检查每个关键状态，我希望我不必这样做..

won't work, unless of course, I will have check every single key state, which I'm hoping I won't have to do. .

    private void TextBox_KeyDown_1(object sender, KeyEventArgs e)
    {
      Console.WriteLine(combination of keys pressed);
    }

最终目标是检测任何(不是特定的组合/单键)组合键.

The end goal is to detect ANY (not a specific combination/single key) key combination.

LadderLogic 的解决方案完美运行.

LadderLogic's solution works perfectly.

推荐答案

重构你的代码:XAML:<TextBox Text="text" LostFocus="TextBox_LostFocus" KeyDown="TextBox_KeyDown" KeyUp="TextBox_KeyUp"/>

Refactored your code: XAML: <TextBox Text="text" LostFocus="TextBox_LostFocus" KeyDown="TextBox_KeyDown" KeyUp="TextBox_KeyUp"/>

代码隐藏:

List<Key> _pressedKeys = new List<Key>();


private void TextBox_KeyDown(object sender, KeyEventArgs e)
{
    if (_pressedKeys.Contains(e.Key))
        return;
    _pressedKeys.Add(e.Key);


    PrintKeys();
    e.Handled = true;
}

private void TextBox_KeyUp(object sender, KeyEventArgs e)
{
    _pressedKeys.Remove(e.Key);
    PrintKeys();
    e.Handled = true;

}

private void PrintKeys()
{
    StringBuilder b = new StringBuilder();

    b.Append("Combination: ");
    foreach (Key key in _pressedKeys)
    {
        b.Append(key.ToString());
        b.Append("+");
    }
    b.Length--;
    Console.WriteLine(b.ToString());
}

private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
    _pressedKeys.Clear();
}

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