回答編集履歴
2
見直しキャンペーン中
test
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@@ -24,7 +24,7 @@
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[【WPF】Dictonaryの値をコンボボックスに表示できない、クラスを参照したい](https://teratail.com/questions/345835#reply-475188)
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MainWindow
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-
```x
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```xml
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<Window
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x:Class="Qjru5bj6b9xz7g1.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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@@ -63,7 +63,7 @@
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</DataGrid>
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</Window>
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```
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```
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```cs
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using System.Windows;
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using System.Windows.Controls;
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@@ -96,7 +96,7 @@
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```
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ChildWindow
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```x
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```xml
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<Window
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x:Class="Qjru5bj6b9xz7g1.ChildWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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@@ -150,7 +150,7 @@
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</ItemsControl>
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</Window>
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```
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```
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```cs
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using System.Windows;
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namespace Qjru5bj6b9xz7g1
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@@ -169,7 +169,7 @@
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```
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ViewModel
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-
```
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```cs
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using System.Collections.ObjectModel;
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using System.Windows;
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using System.Windows.Input;
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追加削除の例追加
test
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@@ -29,6 +29,7 @@
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x:Class="Qjru5bj6b9xz7g1.MainWindow"
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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x:Name="Root"
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Title="MainWindow"
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Width="800"
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Height="450">
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@@ -39,26 +40,56 @@
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<DataGridTextColumn Binding="{Binding Top}" Header="Top" />
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<DataGridTextColumn Binding="{Binding Width}" Header="Width" />
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<DataGridTextColumn Binding="{Binding Height}" Header="Height" />
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<DataGridTemplateColumn Header="追加">
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<DataGridTemplateColumn.CellTemplate>
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<DataTemplate>
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<!-- 追加ボタンで一部コピーしたアイテムを追加します（コードビハインドでの例） -->
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<Button Click="Add_Click" Content="+" />
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</DataTemplate>
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</DataGridTemplateColumn.CellTemplate>
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</DataGridTemplateColumn>
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<DataGridTemplateColumn Header="削除">
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<DataGridTemplateColumn.CellTemplate>
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<DataTemplate>
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<!-- 削除ボタンでアイテムを削除します（MVVMコマンドでの例） -->
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<Button
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Command="{Binding DataContext.DelCommand, Source={x:Reference Root}}"
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CommandParameter="{Binding}"
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Content="-" />
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</DataTemplate>
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</DataGridTemplateColumn.CellTemplate>
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</DataGridTemplateColumn>
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</DataGrid.Columns>
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</DataGrid>
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</Window>
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```
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```C#
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using System.Windows;
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using System.Windows.Controls;
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namespace Qjru5bj6b9xz7g1
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{
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public partial class MainWindow : Window
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{
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private readonly ViewModel vm = new ViewModel();
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public MainWindow()
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{
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InitializeComponent();
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var vm = new ViewModel();
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DataContext = vm;
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// DataContextに同じvmを入れればいい
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new ChildWindow { DataContext = vm, }.Show();
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}
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private void Add_Click(object sender, RoutedEventArgs e)
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{
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if (((Button)sender).DataContext is Item item)
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{
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//クリックした行と部分的に同じものを、1つ下の行に挿入
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var i = vm.Items.IndexOf(item);
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vm.Items.Insert(i + 1, new Item { Title = item.Title, Source = item.Source, });
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}
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}
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}
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}
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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xmlns:Behaviors="http://schemas.microsoft.com/xaml/behaviors"
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x:Name="Root"
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Title="ChildWindow"
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Width="800"
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Height="450">
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<ItemsControl ItemsSource="{Binding Items}">
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<ItemsControl Background="White" ItemsSource="{Binding Items}">
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<ItemsControl.ContextMenu>
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<ContextMenu>
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<!-- 何もないところの右クリックメニューで新規アイテムを追加します（コードビハインドでの例） -->
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<MenuItem Click="Add_Click" Header="追加" />
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</ContextMenu>
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</ItemsControl.ContextMenu>
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<ItemsControl.ItemsPanel>
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<ItemsPanelTemplate>
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<Canvas />
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@@ -83,6 +121,15 @@
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<ItemsControl.ItemTemplate>
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<DataTemplate>
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<Grid>
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<Grid.ContextMenu>
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<ContextMenu>
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<!-- アイテムの右クリックメニューでアイテムを削除します（MVVMコマンドでの例） -->
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<MenuItem
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Command="{Binding DataContext.DelCommand, Source={x:Reference Root}}"
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CommandParameter="{Binding}"
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Header="削除" />
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</ContextMenu>
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</Grid.ContextMenu>
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<StackPanel>
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<StackPanel.RenderTransform>
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<TranslateTransform X="{Binding Left}" Y="{Binding Top}" />
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@@ -111,6 +158,12 @@
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public partial class ChildWindow : Window
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{
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public ChildWindow() => InitializeComponent();
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private void Add_Click(object sender, RoutedEventArgs e)
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{
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// DataContextがViewModelのはずなのでキャストして使用する
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((ViewModel)DataContext).Items.Add(new Item());
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}
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}
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}
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```
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ViewModel
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```C#
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using System.Collections.ObjectModel;
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using System.Windows;
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using System.Windows.Input;
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using CommunityToolkit.Mvvm.ComponentModel;
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using CommunityToolkit.Mvvm.Input;
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namespace Qjru5bj6b9xz7g1
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{
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public class ViewModel
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{
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public ObservableCollection<Item> Items { get; } = new ObservableCollection<Item>();
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public ICommand DelCommand { get; }
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public ViewModel()
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{
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Items.Add(new Item { Title = "TN8001", Left = 0, Top = 0, Width = 200, Source = "https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg", });
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Items.Add(new Item { Title = "nya-3", Source = "https://www.gravatar.com/avatar/4d48208fd97fc8a0d8d0765a11592aa5?d=identicon", });
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DelCommand = new RelayCommand<Item>(Del);
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}
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private void Del(Item item)
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{
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// MVVM的にはよろしくないが...
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var r = MessageBox.Show("削除します。いいですか？", "", MessageBoxButton.YesNo, MessageBoxImage.Information);
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if (r == MessageBoxResult.Yes)
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{
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Items.Remove(item); // 当該アイテムを削除
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}
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}
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}
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@@ -155,7 +224,7 @@
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}
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}
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```
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---
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