WPF 文本框拦截 RoutedUICommands

Question

我正在尝试在我的 WPF 应用程序中使用 Undo/Redo 键盘快捷键(我使用 Command Pattern 实现了我自己的自定义功能)。然而，似乎 TextBox控件正在拦截我的“撤消”RoutedUICommand。

禁用此功能的最简单方法是什么，以便我可以在 UI 树的根部捕获 Ctrl+Z？我想避免在每个 TextBox 中添加大量代码/XAML如果可能的话，在我的申请中。

下面简要说明问题:

<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!"); }
    }
}

Answer 1

没有直接的方法来抑制所有绑定(bind)，请勿设置 IsUndoEnabled至false因为它只会捕获和刷新 Ctrl + Z 键绑定(bind)。您需要重定向 CanUndo , CanRedo , Undo和 Redo .这是我如何使用我的 UndoServiceActions单例。

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;
}