在样式中定义 InputBinding

发布于 2024-08-29 06:27:46 字数 1869 浏览 6 评论 0原文

我正在使用 MVVM 设计模式创建一个 WPF 应用程序,并且尝试扩展 TabItem 控件,以便在用户单击鼠标中键时关闭选项卡。我正在尝试使用 InputBindings 来实现此目的,并且它工作得很好,直到我尝试在样式中定义它。我了解到,除非使用 DependencyProperty 附加它,否则无法将 InputBindings 添加到样式中。所以我在这里遵循了类似的帖子...并且它有效...几乎。我可以使用鼠标中键关闭一个选项卡,但它不适用于任何其他选项卡(所有选项卡都是在运行时添加并继承相同的样式)。

所以我需要一些帮助。为什么这只能在第一次起作用,而在之后就不起作用?显然,我可以创建一个继承自 TabItem 的自定义控件并使其工作,但我想弄清楚这一点,因为我可以看到它在我的项目中扩展。我不是 DependencyProperties 方面的专家,所以请帮助我。谢谢!

风格:

<Style TargetType="{x:Type TabItem}">
    <Setter Property="w:Attach.InputBindings">
        <Setter.Value>
            <InputBindingCollection>
                <MouseBinding MouseAction="MiddleClick" 
                              Command="{Binding CloseCommand}"/>
            </InputBindingCollection>
        </Setter.Value>
    </Setter>
    ...
</Style>

public class Attach
{
    public static readonly DependencyProperty InputBindingsProperty =
        DependencyProperty.RegisterAttached("InputBindings", typeof(InputBindingCollection), typeof(Attach),
        new FrameworkPropertyMetadata(new InputBindingCollection(),
        (sender, e) =>
        {
            var element = sender as UIElement;
            if (element == null) return;
            element.InputBindings.Clear();
            element.InputBindings.AddRange((InputBindingCollection)e.NewValue);
        }));

    public static InputBindingCollection GetInputBindings(UIElement element)
    {
        return (InputBindingCollection)element.GetValue(InputBindingsProperty);
    }

    public static void SetInputBindings(UIElement element, InputBindingCollection inputBindings)
    {
        element.SetValue(InputBindingsProperty, inputBindings);
    }
}

I'm creating a WPF app using the MVVM design pattern, and I'm trying to extend the TabItem control so that it closes the tab when the user clicks the middle mouse button. I'm trying to achieve this using InputBindings, and it works very well until I try to define it within a style. I've learned that you cannot add InputBindings to a style unless you attach it using a DependencyProperty. So I followed this similar post here... and it works... almost. I can close one tab using the middle mouse button, but it won't work on any of the other tabs (all of the tabs are added at runtime and inherit the same style).

So I need some help. Why would this only be working the first time, and not after? Obviously I could create a custom control that inherits from a TabItem and make it work, but I'd like to figure this out as I can see this being expanded in my projects. I'm no expert on DependencyProperties, so please help me out. Thanks!

Style:

<Style TargetType="{x:Type TabItem}">
    <Setter Property="w:Attach.InputBindings">
        <Setter.Value>
            <InputBindingCollection>
                <MouseBinding MouseAction="MiddleClick" 
                              Command="{Binding CloseCommand}"/>
            </InputBindingCollection>
        </Setter.Value>
    </Setter>
    ...
</Style>

Class

public class Attach
{
    public static readonly DependencyProperty InputBindingsProperty =
        DependencyProperty.RegisterAttached("InputBindings", typeof(InputBindingCollection), typeof(Attach),
        new FrameworkPropertyMetadata(new InputBindingCollection(),
        (sender, e) =>
        {
            var element = sender as UIElement;
            if (element == null) return;
            element.InputBindings.Clear();
            element.InputBindings.AddRange((InputBindingCollection)e.NewValue);
        }));

    public static InputBindingCollection GetInputBindings(UIElement element)
    {
        return (InputBindingCollection)element.GetValue(InputBindingsProperty);
    }

    public static void SetInputBindings(UIElement element, InputBindingCollection inputBindings)
    {
        element.SetValue(InputBindingsProperty, inputBindings);
    }
}

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评论(2

倾其所爱 2024-09-05 06:27:46

你的“Attach”课程对我来说效果很好!
如果有人需要,诀窍是使用这样的样式,并带有 x:Shared 修饰符:

<InputBindingCollection x:Key="inputCollection" x:Shared="False">
        <KeyBinding Key="Del" Command="{Binding DeleteItemCommand}"/>
</InputBindingCollection>

<Style TargetType="{x:Type TabItem}">
    <Setter Property="w:Attach.InputBindings" Value="{StaticResource inputCollection}" />
    ...
</Style>

谢谢!

Your class "Attach" worked fine for me!
If anyone needs, the trick is use style like this, with the x:Shared modifier:

<InputBindingCollection x:Key="inputCollection" x:Shared="False">
        <KeyBinding Key="Del" Command="{Binding DeleteItemCommand}"/>
</InputBindingCollection>

<Style TargetType="{x:Type TabItem}">
    <Setter Property="w:Attach.InputBindings" Value="{StaticResource inputCollection}" />
    ...
</Style>

Thanks!

转角预定愛 2024-09-05 06:27:46

没关系,我自己想出来了。我最终甚至没有使用上面的 Attach 类...相反,我在 ControlTemplate 上为 TabItem (这是一个边框)使用了 InputBindings,所以它看起来像这样...我不知道为什么我没有想到首先是这个..:)

<ControlTemplate TargetType="{x:Type TabItem}">
    <Grid SnapsToDevicePixels="true">
        <Border x:Name="Bd" ...>
            <DockPanel>
                ...
            </DockPanel>
            <Border.InputBindings>
                <MouseBinding MouseAction="MiddleClick"
                              Command="{Binding CloseCommand}"/>
            </Border.InputBindings>
        </Border>
    </Grid>
    ...
</ControlTemplate>

Never mind, I figured it out myself. I ended up not even using the Attach class above... instead I used InputBindings on the ControlTemplate for the TabItem (which is a Border), so it looked something like this... I don't know why I didn't think of this in the first place.. :)

<ControlTemplate TargetType="{x:Type TabItem}">
    <Grid SnapsToDevicePixels="true">
        <Border x:Name="Bd" ...>
            <DockPanel>
                ...
            </DockPanel>
            <Border.InputBindings>
                <MouseBinding MouseAction="MiddleClick"
                              Command="{Binding CloseCommand}"/>
            </Border.InputBindings>
        </Border>
    </Grid>
    ...
</ControlTemplate>
~没有更多了~
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