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【WPF】単一選択のListBoxで選択解除の機能をBehaviorで実装してみた。 ※参考サイト ・stakcoverflow http://stackoverflow.com/questions/5139956/listbox-with-single-select-and-also-unselect-on-click ・WPFビヘイビアなるもの https://tocsworld.wordpress.com/2014/07/02/wpf-%E3%83%93%E3%83%98%E3%82%A4%E3%83%93%E3%82%A2-%E3%81%AA%E3%82%8B%E3%82%82%E3%81%AE/
<Window x:Class="ListBoxTest.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:my ="clr-namespace:TestAikazu"
Title="MainWindow" Height="350" Width="525">
<Grid>
<ListBox x:Name="Text">
<i:Interaction.Behaviors>
<my:ListBoxSelectionBehavior/>
</i:Interaction.Behaviors>
</ListBox>
</Grid>
</Window>
using System;
using System.Collections;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Controls.Primitives;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Interactivity;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace ListBoxTest
{
/// <summary>
/// MainWindow.xaml の相互作用ロジック
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
for (int i = 0; i < 10; i++)
{
this.Text.Items.Add("hogehoge");
this.Text.Items.Add("hugehuge");
this.Text.Items.Add("aikazuyendo");
}
}
}
}
namespace TestAikazu
{
/// <summary>
/// ListBox単一選択の選択・選択解除を提供するBehaviorです。
/// </summary>
public class ListBoxSelectionBehavior : Behavior<ListBox>
{
/// <summary>
/// イベントを登録します。
/// BehaviorがListBoxにアタッチされた後で呼び出されます。
/// </summary>
protected override void OnAttached()
{
base.OnAttached();
if (AssociatedObject == null)
{
return;
}
// イベント登録
AssociatedObject.SelectionMode = SelectionMode.Multiple;
AssociatedObject.SelectionChanged += OnSelectionChanged;
}
/// <summary>
/// BehaviorがListBoxにでタッチされる時に呼び出せます。
/// </summary>
protected override void OnDetaching()
{
if (AssociatedObject != null)
{
// イベント削除
AssociatedObject.SelectionChanged -= OnSelectionChanged;
AssociatedObject.SelectionMode = SelectionMode.Single;
}
base.OnDetaching();
}
/// <summary>
/// SelectionChangedイベント処理
/// </summary>
/// <param name="sender">sender</param>
/// <param name="e">e</param>
protected virtual void OnSelectionChanged(object sender, SelectionChangedEventArgs e)
{
if (e.AddedItems.Count > 0)
{
var target = e.AddedItems[0];
var listBox = sender as ListBox;
if (listBox != null)
{
foreach (var item in new ArrayList(listBox.SelectedItems))
{
// 選択済みのアイテムがクリックされた場合は選択解除する。
if (item.GetHashCode() != target.GetHashCode())
{
listBox.SelectedItems.Remove(item);
}
}
}
}
}
}
}
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