WPF文本框拦截RoutedUICommands [英] WPF TextBox Intercepting RoutedUICommands

问题描述

我试图在WPF应用程序中使用撤消/重做键盘快捷键(我使用

I am trying to get Undo/Redo keyboard shortcuts working in my WPF application (I have my own custom functionality implemented using the Command Pattern). It seems, however, that the TextBox control is intercepting my "Undo" RoutedUICommand.

禁用此功能最简单的方法是什么，这样我就可以在UI树的根目录中捕获Ctrl + Z了?如果可能，我想避免在我的应用程序的每个TextBox中放入大量代码/XAML.

What is the simplest way to disable this so that I can catch Ctrl+Z at the root of my UI tree? I would like to avoid putting a ton of code/XAML into each TextBox in my application if possible.

以下简要说明了该问题:

The following briefly demonstrates the problem:

<Window x:Class="InputBindingSample.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:loc="clr-namespace:InputBindingSample"
    Title="Window1" Height="300" Width="300">
    <Window.CommandBindings>
        <CommandBinding Command="loc:Window1.MyUndo" Executed="MyUndo_Executed" />
    </Window.CommandBindings>
    <DockPanel LastChildFill="True">
        <StackPanel>
            <Button Content="Ctrl+Z Works If Focus Is Here" />
            <TextBox Text="Ctrl+Z Doesn't Work If Focus Is Here" />
        </StackPanel>
    </DockPanel>
</Window>

---

using System.Windows;
using System.Windows.Input;

namespace InputBindingSample
{
    public partial class Window1
    {
        public static readonly RoutedUICommand MyUndo = new RoutedUICommand("MyUndo", "MyUndo", typeof(Window1),
            new InputGestureCollection(new[] { new KeyGesture(Key.Z, ModifierKeys.Control) }));

        public Window1() { InitializeComponent(); }

        private void MyUndo_Executed(object sender, ExecutedRoutedEventArgs e) { MessageBox.Show("MyUndo!"); }
    }
}

推荐答案

没有抑制所有绑定的简单方法，不要将IsUndoEnabled设置为false，因为它只会捕获并刷新 Ctrl + Z 键绑定.您需要重定向CanUndo，CanRedo，Undo和Redo.这是我使用UndoServiceActions单例的方法.

There is no straightforward way to supress all bindings, do not set IsUndoEnabled to false as it will only trap and flush Ctrl + Z key binding. You need to redirect CanUndo, CanRedo, Undo and Redo. Here is how I do it with my UndoServiceActions singleton.

textBox.CommandBindings.Add(new CommandBinding(ApplicationCommands.Undo,
                                               UndoCommand, CanUndoCommand));
textBox.CommandBindings.Add(new CommandBinding(ApplicationCommands.Redo,
                                               RedoCommand, CanRedoCommand));

private void CanRedoCommand(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = UndoServiceActions.obj.UndoService.CanRedo;
    e.Handled = true;
}

private void CanUndoCommand(object sender, CanExecuteRoutedEventArgs e)
{
    e.CanExecute = UndoServiceActions.obj.UndoService.CanUndo;
    e.Handled = true;
}

private void RedoCommand(object sender, ExecutedRoutedEventArgs e)
{
    UndoServiceActions.obj.UndoService.Redo();
    e.Handled = true;
}

private void UndoCommand(object sender, ExecutedRoutedEventArgs e)
{
    UndoServiceActions.obj.UndoService.Undo();
    e.Handled = true;
}

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