如何禁用 WPF RibbonSplitButton 控件中的下拉按钮

Question

我正在使用 WPF Ribbon 4。我有一个带有菜单项下拉菜单的 RibbonSplitButton 控件。 当我将 RibbonSplitButton 的 IsEnabled 属性设置为 false 时，仅顶部按钮被禁用，而不是打开下拉菜单的按钮。

提前致谢。

Answer 1

我通过创建自己的分割按钮、继承 RibbonSplitButton 并添加一个依赖属性来解决这个问题，我可以绑定该属性以单独启用或禁用分割按钮。

public class MyRibbonSplitButton : RibbonSplitButton
{
    public MyRibbonSplitButton()
        : base()
    {
    }

    /// <summary>
    /// Gets or sets a value indicating whether the toggle button is enabled.
    /// </summary>
    /// <value><c>true</c> if the toggle button should be  enabled; otherwise, <c>false</c>.</value>
    public bool IsToggleButtonEnabled
    {
        get { return (bool)GetValue(IsToggleButtonEnabledProperty); }
        set { SetValue(IsToggleButtonEnabledProperty, value); }
    }

    /// <summary>
    /// Identifies the <see cref="IsToggleButtonEnabled"/> dependency property
    /// </summary>
    public static readonly DependencyProperty IsToggleButtonEnabledProperty =
        DependencyProperty.Register(
            "IsToggleButtonEnabled", 
            typeof(bool), 
            typeof(MyRibbonSplitButton), 
            new UIPropertyMetadata(true, new PropertyChangedCallback(MyRibbonSplitButton.ToggleButton_OnIsEnabledChanged)));

    /// <summary>
    /// Handles the PropertyChanged event for the IsToggleButtonEnabledProperty dependency property
    /// </summary>
    private static void ToggleButton_OnIsEnabledChanged(object sender, DependencyPropertyChangedEventArgs e)
    {
        var button = sender as MyRibbonSplitButton;

        var toggleButton = button.GetTemplateChild("PART_ToggleButton") as RibbonToggleButton;
        toggleButton.IsEnabled = (bool)e.NewValue;
    }
}

在 XAML 中：

   <local:MyRibbonSplitButton Label="New" Command="{Binding SomeCommand}" 
                          LargeImageSource="Images/Large/New.png"
                          ItemsSource="{Binding Templates}"
                          IsToggleButtonEnabled="{Binding HasTemplates}"/>

Answer 2

您可以简单地将 DropDownOpened="RibbonMenuButton_OnDropDownOpened" 添加到 WPF，然后

    private void RibbonMenuButton_OnDropDownOpened(object sender, EventArgs e)
    {
        var rsb = sender as RibbonSplitButton;
        if (rsb == null) return;
        if (DataContext is GameCardViewModel vm)
        {
            rsb.IsDropDownOpen = vm.EasyInputMode;
        }
    }