WPF Prism 模块添加应用程序快捷键的实践探索

最新推荐文章于 2025-09-20 11:32:36 发布

原创最新推荐文章于 2025-09-20 11:32:36 发布 · 682 阅读

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CC 4.0 BY-SA版权

本文介绍了一种在WPF Prism模块化环境中为特定模块添加快捷键的方法。通过自定义Behavior，可以在不直接修改窗口的情况下实现快捷键功能。文章提供了C#代码示例，演示如何使用依赖属性和事件处理程序来实现这一目标。

应用场景

给应用添加快捷键是很常见的场景，WPF下的一般做法是Window下添加 KeyBinding 。
但是WPF Prism模块化之后，有时候我们需要给某一个模块添加快捷键，本文主要讨论这种场景下的一种实践。

代码

参考链接 https://stackoverflow.com/a/42974477/14124583
基本思路通过 Behavior 找到控件的父窗体，添加 PreviewKeyDown 事件处理
修改了参考链接的代码来支持单键快捷键。

C#代码

    public class KeyboardShortcutBehavior : Behavior<FrameworkElement>
    {
        private Window _parentWindow;

        public static readonly DependencyProperty CommandProperty =
            DependencyProperty.Register(nameof(Command), typeof(ICommand),
            typeof(KeyboardShortcutBehavior), new FrameworkPropertyMetadata(null));

        public ICommand Command
        {
            get { return (ICommand)GetValue(CommandProperty); }
            set { SetValue(CommandProperty, value); }
        }

        public static readonly DependencyProperty ModifierKeyProperty =
            DependencyProperty.Register(nameof(ModifierKey), typeof(ModifierKeys),
            typeof(KeyboardShortcutBehavior), new FrameworkPropertyMetadata(ModifierKeys.None));

        public ModifierKeys ModifierKey
        {
            get { return (ModifierKeys)GetValue(ModifierKeyProperty); }
            set { SetValue(ModifierKeyProperty, value); }
        }

        public static readonly DependencyProperty KeyProperty =
            DependencyProperty.Register(nameof(Key), typeof(Key),
                typeof(KeyboardShortcutBehavior), new FrameworkPropertyMetadata(Key.None));

        public Key Key
        {
            get { return (Key)GetValue(KeyProperty); }
            set { SetValue(KeyProperty, value); }
        }

        protected override void OnAttached()
        {
            base.OnAttached();
            AssociatedObject.Loaded += AssociatedObject_Loaded;
            AssociatedObject.Unloaded += AssociatedObject_Unloaded;
        }


        private void AssociatedObject_Loaded(object sender, RoutedEventArgs e)
        {
            _parentWindow = Window.GetWindow(AssociatedObject);
            if (_parentWindow != null)
            {
                _parentWindow.PreviewKeyDown += ParentWindow_PreviewKeyDown;
            }
        }

        private void ParentWindow_PreviewKeyDown(object sender, KeyEventArgs e)
        {
            if (Command != null && Key != Key.None && Keyboard.Modifiers == ModifierKey && e.Key == Key)
                Command.Execute(null);
        }

        private void AssociatedObject_Unloaded(object sender, RoutedEventArgs e)
        {
            if (_parentWindow != null)
            {
                _parentWindow.PreviewKeyDown -= ParentWindow_PreviewKeyDown;
            }
        }

        protected override void OnDetaching()
        {
            base.OnDetaching();
            AssociatedObject.Loaded -= AssociatedObject_Loaded;
            AssociatedObject.Unloaded -= AssociatedObject_Loaded;
        }
    }

xaml代码

<UserControl ...
             xmlns:i="http://schemas.microsoft.com/xaml/behaviors" 
             ...>
        <behaviors:KeyboardShortcutBehavior Key="A" Command="{Binding Command0}" />
        <behaviors:KeyboardShortcutBehavior Key="A" ModifierKey="Ctrl" Command="{Binding Command1}" />
    <Grid>
        <TextBlock HorizontalAlignment="Center"
                   VerticalAlignment="Center"
                   FontSize="24"
                   Text="Message" />
    </Grid>
</UserControl>