“Esc”如何? WPF 窗口中处理的键?

发布于 2024-08-29 08:08:19 字数 451 浏览 10 评论 0原文

我想要使​​用 Escape 键关闭 WPF 窗口。但是,如果有一个控件可以使用该 Escape 键,我不想关闭窗口。关于按下 ESC 键时如何关闭 WPF 窗口有多种解决方案。例如。 WPF Button.IsCancel 属性如何工作?

解决方案关闭窗口,而不考虑是否存在可以使用 Escape 键的活动控件。

例如。我有一个带有 DataGrid 的窗口。 dataGrid 上的列之一是组合框。如果我要更改组合框并按 Escape 键,则控件应该退出组合框的编辑(正常行为)。如果我现在再次按 Esc 键,那么窗口应该关闭。我想要一个通用的解决方案,而不是编写大量自定义代码。

如果你能提供一个 C# 解决方案那就太好了。

I want the Escape key to close my WPF window. However if there is a control that can consume that Escape key, I don't want to close the Window. There are multiple solutions on how to close the WPF Window when ESC key is pressed. eg. How does the WPF Button.IsCancel property work?

However this solution closes the Window, without regard to if there is an active control that can consume the Escape key.

For eg. I have a Window with a DataGrid. One of the columns on the dataGrid is a combobox. If I am changing the ComboBox, and hit Escape, then the control should come out of editing of the comboBox (Normal Behavior). And if I now hit Escape again, then the Window should close. I would like a generic solution, instead of writing a lot of custom code.

If you can provide a solution in C# it would be great.

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评论(3

红焚 2024-09-05 08:08:19

您应该只使用 KeyDown 事件而不是 PreviewKeyDown 事件。如果 Window 的任何子级处理该事件,则该事件不会向上冒泡到 Window(PreviewKeyDownWindow 向下传输),因此您的事件处理程序将不会被调用。

You should just use the KeyDown event instead of the PreviewKeyDown event. If any child of the Window handles the event, it won't be bubbled up to the Window (PreviewKeyDown tunnels from the Window down), and therefore your event handler won't be called.

独闯女儿国 2024-09-05 08:08:19

可能有更简单的方法,但您可以使用哈希码来完成。 Keys.Escape 是另一种选择,但有时由于某种原因我无法使其工作。您没有指定语言,因此这里是 VB.NET 中的示例:

Private Sub someTextField_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles someTextField.KeyPress

    If e.KeyChar.GetHashCode = 1769499 Then ''this number is the hash code for escape on my computer, do not know if it is the same for all computers though.
        MsgBox("escape pressed") ''put some logic in here that determines what ever you wanted to know about your "active control"
    End If

End Sub

There may be an easier way, but you could do it with the hash code. Keys.Escape is another option, but sometimes I cannot get that to work for some reason. You didn't specify a language so here is an example in VB.NET:

Private Sub someTextField_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles someTextField.KeyPress

    If e.KeyChar.GetHashCode = 1769499 Then ''this number is the hash code for escape on my computer, do not know if it is the same for all computers though.
        MsgBox("escape pressed") ''put some logic in here that determines what ever you wanted to know about your "active control"
    End If

End Sub
屌丝范 2024-09-05 08:08:19
class Commands
{
    static Command
    {
        CloseWindow = NewCommand("Close Window", "CloseWindow", new KeyGesture(Key.Escape));
        CloseWindowDefaultBinding = new CommandBinding(CloseWindow,
            CloseWindowExecute, CloseWindowCanExecute);
    }

    public static CommandBinding CloseWindowDefaultBinding { get; private set; }
    public static RoutedUICommand CloseWindow { get; private set; }

    static void CloseWindowCanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = sender != null && sender is System.Windows.Window;
        e.Handled = true;
    }
    static void CloseWindowExecute(object sender, ExecutedRoutedEventArgs e)
    {
         ((System.Windows.Window)sender).Close();
    }
}

// In your window class's constructor. This could also be done
// as a static resource in the window's XAML resources.
CommandBindings.Add(Commands.CloseWindowDefaultBinding);
class Commands
{
    static Command
    {
        CloseWindow = NewCommand("Close Window", "CloseWindow", new KeyGesture(Key.Escape));
        CloseWindowDefaultBinding = new CommandBinding(CloseWindow,
            CloseWindowExecute, CloseWindowCanExecute);
    }

    public static CommandBinding CloseWindowDefaultBinding { get; private set; }
    public static RoutedUICommand CloseWindow { get; private set; }

    static void CloseWindowCanExecute(object sender, CanExecuteRoutedEventArgs e)
    {
        e.CanExecute = sender != null && sender is System.Windows.Window;
        e.Handled = true;
    }
    static void CloseWindowExecute(object sender, ExecutedRoutedEventArgs e)
    {
         ((System.Windows.Window)sender).Close();
    }
}

// In your window class's constructor. This could also be done
// as a static resource in the window's XAML resources.
CommandBindings.Add(Commands.CloseWindowDefaultBinding);
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