清除其他 ListView 选择

Question

如何正确清除其他ListView中的selection？例如我有 4 个列表视图堆叠，如果我在 listView1 中有一个 selection，那么我在 listView2 中 select 一个新项目，我希望 listView1 中的 selection 消失并且 listview2 中的项目已正确 selected。注意：列表视图是单个 selection.

<StackPanel>
   <ListView x:Name="listView1" />
   <ListView x:Name="listView2" />
   <ListView x:Name="listView3" />
   <ListView x:Name="listView4" />
</StackPanel>

我第一次尝试：

<StackPanel>
   <ListView x:Name="listView1" SelectionChanged="selectionchanged1" />
   <ListView x:Name="listView2" SelectionChanged="selectionchanged2" />
   <ListView x:Name="listView3" SelectionChanged="selectionchanged3" />
   <ListView x:Name="listView4" SelectionChanged="selectionchanged4" />
</StackPanel>

隐藏代码：

private void selectionChanged1(object sender, SelectionChangedEventArgs e)
{
    listView2.SelectedItem = null;
    listView3.SelectedItem = null;
    listView4.SelectedItem = null;
}
private void selectionChanged2(object sender, SelectionChangedEventArgs e)
{
    listView1.SelectedItem = null;
    listView3.SelectedItem = null;
    listView4.SelectedItem = null;
}
...

我遇到的问题是在 listView1 中有一个 selection 并单击 listView2 中的一个项目后，listView1 中的 selection 被清除，但 listView2 中的项目不是 selected.

原因是（至少）触发了 2 个事件：

selectionchanged2 被触发，在列表视图 1,3,4
因为我正在清除 listview1 中的 selection，selectionchanged1 也被触发，它清除了 listview 2,3,4
我认为 selectionchanged2 又被触发了。
因此我最终在任何列表中都没有 selection。

你有更好的建议吗？

Answer 1

也许试试这个：Link它们全部交给同一个处理程序，例如：

<StackPanel>
   <ListView x:Name="listView1" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView2" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView3" SelectionChanged="selectionchanged" />
   <ListView x:Name="listView4" SelectionChanged="selectionchanged" />
</StackPanel>

然后：

private void selectionChanged(object sender, SelectionChangedEventArgs e)
{
    string listViewName = ((ListView)sender).Name;
    if (listViewName == "listView1")
    {
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
    else if (listViewName == "listView3")
    {
        listView1.SelectedItem = null;
        listView2.SelectedItem = null;
        listView4.SelectedItem = null;
    }
    else if (listViewName == "listView4")
    {
        listView1.SelectedItem = null;
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
    }
    else if (listViewName == "listView2")
    {
        listView1.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
}

它又乱又长（未经测试），但如果它有效，请告诉我。

Answer 2

您可以在清除其他字段之前添加空检查，例如

对于 listView1：

private void selectionChanged1(object sender, SelectionChangedEventArgs e)
{
    if(listView1.SelectedItem == null)
    {
        listView2.SelectedItem = null;
        listView3.SelectedItem = null;
        listView4.SelectedItem = null;
    }
}

同样可以给别人改。

Answer 3

我认为您可以尝试将此 SelectionChanged 事件用于所有 ListViews:

private void ListView_SelectionChanged(object sender, SelectionChangedEventArgs e)
{
    if (e.AddedItems.Count != 0)
    {
        if (listView1 != sender as ListView) listView1.SelectedItem = null;
        if (listView2 != sender as ListView) listView2.SelectedItem = null;
        if (listView3 != sender as ListView) listView3.SelectedItem = null;
        if (listView4 != sender as ListView) listView4.SelectedItem = null;
    }
}

它只是检查 ListView 中是否有新设置，如果有，则清除所有其他 ListViews.

Answer 4

当您将 ListView 的 SelectedItem 设置为 null 时，SelectionChanged 事件将再次触发，因为 ListView 的 SelectedItem 已更改，因此您可以使用标志跳过第二次 SelectionChanged even 调用。

检查下面的代码片段。希望对您有所帮助。

XAML

<Window x:Class="ListView.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:ListView"
        mc:Ignorable="d"
        Title="MainWindow" Height="350" Width="525">
    <Grid>
        <StackPanel x:Name="MyStackPanel">
            <ListView x:Name="listView1" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 1</ListViewItem>
                <ListViewItem>Item 2</ListViewItem>
            </ListView>
            <ListView x:Name="listView2" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 3</ListViewItem>
                <ListViewItem>Item 4</ListViewItem>
            </ListView>
            <ListView x:Name="listView3" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 5</ListViewItem>
                <ListViewItem>Item 6</ListViewItem>
            </ListView>
            <ListView x:Name="listView4" SelectionChanged="listView1_SelectionChanged" SelectionMode="Single">
                <ListViewItem>Item 7</ListViewItem>
                <ListViewItem>Item 8</ListViewItem>
            </ListView>
        </StackPanel>
    </Grid>
</Window>

代码隐藏

namespace ListView
{
    using System.Windows;
    using System.Windows.Controls;

    /// <summary>
    /// Interaction logic for MainWindow.xaml
    /// </summary>
    public partial class MainWindow : Window
    {
        private bool skipSelectionChanged;

        public MainWindow()
        {
            InitializeComponent();
        }

        private void listView1_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            if (skipSelectionChanged)
            {
                skipSelectionChanged = false;

                return;
            }

            var listView = sender as ListView;

            if (listView != null)
            {
                var name = listView.Name;
                for (int i = 0; i < MyStackPanel.Children.Count; i++)
                {
                    var child = MyStackPanel.Children[i] as ListView;
                    if (child.Name != name && child.SelectedItem != null)
                    {
                        skipSelectionChanged = true;
                        child.SelectedItem = null;
                    }
                }
            }
        }
    }
}

清除其他 ListView 选择

Clearing other ListView Selection

c#

wpf

xaml

uwp

uwp-xaml