如何在WPF中创建不可选择的TreeViewItem

发布于 2024-08-31 15:43:57 字数 352 浏览 4 评论 0原文

我正在绑定 TreeView。我的原因是树视图级别 0 是不可选择的。当我单击 0 级树视图项目时，当前项目必须折叠并且必须选择第一个子项目。

├ Item 1   //<- level 0. this item must be unselectable
├─ Child Item 11 //<- level 1
├─ Child Item 12
├ Item 2   //<- level 0. When i click this item, that is automatically collapse
├─ Child Item 21
├─ Child Item 22

如何使用样式来做到这一点？

原文

I'm binding TreeView. My reason is treeview level 0 is unselectable. When i click level 0 treeviewitem, current item must be collapse and first child item must be selected.

├ Item 1   //<- level 0. this item must be unselectable
├─ Child Item 11 //<- level 1
├─ Child Item 12
├ Item 2   //<- level 0. When i click this item, that is automatically collapse
├─ Child Item 21
├─ Child Item 22

How to do this using style?

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一杯敬自由 2024-09-07 15:43:57

我会在我的视图模型中执行此操作。 0 级项目的视图模型将具有：

public bool IsSelected
{
    get { return false; }
    set
    {
        // error checking is omitted
        Children[0].IsSelected = value;

        // let WPF know that IsSelected may have changed from what it's expecting
        this.Dispatcher.BeginInvoke((ThreadStart)delegate
        {
            this.OnPropertyChanged(() => this.IsSelected);
        });
    }
}

您的 XAML 将如下所示：

<TreeView>
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="{Binding IsSelected}"/>
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>

现在，每当用户单击 1 级项目时，VM 将拒绝被选择，而是选择其第一个子项目。

您可以使用完全相同的技术来处理有关折叠级别的要求。

I'd do it in my view model. The view model for level 0 items would have:

public bool IsSelected
{
    get { return false; }
    set
    {
        // error checking is omitted
        Children[0].IsSelected = value;

        // let WPF know that IsSelected may have changed from what it's expecting
        this.Dispatcher.BeginInvoke((ThreadStart)delegate
        {
            this.OnPropertyChanged(() => this.IsSelected);
        });
    }
}

Your XAML would look like:

<TreeView>
    <TreeView.ItemContainerStyle>
        <Style TargetType="TreeViewItem">
            <Setter Property="IsSelected" Value="{Binding IsSelected}"/>
        </Style>
    </TreeView.ItemContainerStyle>
</TreeView>

Now whenever the user clicks on a level-one item, the VM will refuse to be selected and instead select its first child item.

You can use exactly the same technique to handle your requirements around collapsing levels.

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