Question

我正在开发MVVM应用程序，我想为我的应用程序创建全局快捷方式。有必要在模块之间导航应用程序。我有主窗口代码：

<UserControl.InputBindings>
    <KeyBinding Command="{Binding ChangeModuleComand}"
                    Key="M"
                    Modifiers="Control"/>
</UserControl.InputBindings>

当我专注于我的窗口时，它会起作用，

但是当我在UserControl中关注TextBox时会出现问题（命令未被触发）。

是否有可能在整个应用程序中没有大量修改的情况下捕获关键压力？

一个。

Answer 1

听起来你的事件在它起泡之前就被处理了。接下来我想知道你是否可以将输入绑定移动到窗口而不是用户控件。我的最后一个选择是删除输入绑定并创建全局检入代码。

由于您已经在使用输入绑定，我在下面添加了代码选项：

    //In App.xaml.cs
    protected override void OnStartup(StartupEventArgs e)
    {
        base.OnStartup(e);
        EventManager.RegisterClassHandler(typeof(UIElement), UIElement.KeyDownEvent, new RoutedEventHandler(GlobalClick));
    }

    private void GlobalClick(object sender, RoutedEventArgs e)
    {
        var args = (KeyEventArgs) e;
        if (args.KeyboardDevice.IsKeyDown(Key.M) &&
            args.KeyboardDevice.IsKeyDown(Key.LeftCtrl) || args.KeyboardDevice.IsKeyDown(Key.RightCtrl))
            MessageBox.Show("Works");
    }

Answer 2

为其他人记录这个答案，因为有一种更简单的方法可以做到这一点很少被引用，并且根本不需要触及XAML。

要在Window级别链接键盘快捷键，只需在Window构造函数中添加一个新的KeyBinding到InputBindings集合。作为命令，传入实现ICommand的任意命令类。对于execute方法，只需实现您需要的任何逻辑。在下面的示例中，我的WindowCommand类接受一个委托，它将在每次调用时执行。当我构造新的WindowCommand以传入我的绑定时，我只是在我的初始化器中指出我希望WindowCommand执行的方法。

您可以使用此模式提供自己的快捷键盘快捷键。

public YourWindow() //inside any WPF Window constructor
{
   ...
   //add this one statement to bind a new keyboard command shortcut
   InputBindings.Add(new KeyBinding( //add a new key-binding, and pass in your command object instance which contains the Execute method which WPF will execute
      new WindowCommand(this)
      {
         ExecuteDelegate = TogglePause //REPLACE TogglePause with your method delegate
      }, new KeyGesture(Key.P, ModifierKeys.Control)));
   ...
}

创建一个简单的WindowCommand类，它接受一个执行委托来触发任何设置的方法。

public class WindowCommand : ICommand
{
    private MainWindow _window;

    //Set this delegate when you initialize a new object. This is the method the command will execute. You can also change this delegate type if you need to.
    public Action ExecuteDelegate { get; set; }

    //You don't have to add a parameter that takes a constructor. I've just added one in case I need access to the window directly.
    public WindowCommand(MainWindow window)
    {
        _window = window;
    }

    //always called before executing the command, mine just always returns true
    public bool CanExecute(object parameter)
    {
        return true; //mine always returns true, yours can use a new CanExecute delegate, or add custom logic to this method instead.
    }

    public event EventHandler CanExecuteChanged; //i'm not using this, but it's required by the interface

    //the important method that executes the actual command logic
    public void Execute(object parameter)
    {
        if (ExecuteDelegate != null) //let's make sure the delegate was set
        {
            ExecuteDelegate();
        }
        else
        {
            throw new InvalidOperationException("ExecuteDelegate has not been set. There is no method to execute for this command.");
        }
    }
}

我确信这也可用于其他控件，但尚未尝试过。

整个窗口中的WPF快捷方式

2 个答案: