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トップC#に関する質問WPF DataGridのCellStyleについて

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回答編集履歴

1

見直しキャンペーン中

2023/07/20 14:05

投稿

TN8001
TN8001

スコア9813

test CHANGED
@@ -1,259 +1,102 @@
1
1
  `Binding="{Binding Name}"`で楽にバインディングできるのは、その`DataContext`が個々のItemになっているためです。
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-
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-
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  `MainWindowViewModel`のものにバインディングしたい場合、`RelativeSource`等で探してくる必要があります（あまりに頻発するようですと、クラス設計が間違えている可能性があります）
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-
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-
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- ```xaml
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+ ```xml
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-
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  <Window
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-
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  x:Class="Questions241295.MainWindow"
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-
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  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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-
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  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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-
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  xmlns:local="clr-namespace:Questions241295"
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-
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- Title="MainWindow"
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-
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  Width="800"
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-
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  Height="450">
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-
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  <Window.DataContext>
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-
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  <local:MainWindowViewModel />
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-
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  </Window.DataContext>
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-
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- <Grid>
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+ <DockPanel>
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-
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- <Grid.RowDefinitions>
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-
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- <RowDefinition Height="Auto" />
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-
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- <RowDefinition />
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-
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- </Grid.RowDefinitions>
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-
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- <StackPanel Orientation="Horizontal">
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+ <StackPanel DockPanel.Dock="Top">
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-
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- <Button Command="{Binding SetTrueCommand}" Content="IsEditMain True" />
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-
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- <Button Command="{Binding SetFalseCommand}" Content="IsEditMain False" />
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-
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- <Button Command="{Binding SelectedItem.SetTrueCommand, ElementName=dataGrid}" Content="Selected IsEditItem True" />
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+ <CheckBox VerticalContentAlignment="Center" Content="IsEditMain" IsChecked="{Binding IsEditMain}" />
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-
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- <Button Command="{Binding SelectedItem.SetFalseCommand, ElementName=dataGrid}" Content="Selected IsEditItem False" />
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-
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-
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-
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- <TextBlock Text="{Binding IsEditMain, StringFormat=IsEditMain {0}}" />
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-
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  </StackPanel>
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-
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- <DataGrid
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-
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- x:Name="dataGrid"
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-
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- Grid.Row="1"
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-
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- AutoGenerateColumns="False"
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-
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- ItemsSource="{Binding Items}">
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+ <DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Items}">
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-
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  <DataGrid.Columns>
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-
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- <DataGridTextColumn Binding="{Binding Name}" Header="名前" />
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+ <DataGridTextColumn Width="150" Binding="{Binding Name}" Header="名前" />
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-
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- <DataGridTextColumn Binding="{Binding Age}" Header="年齢">
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+ <DataGridTextColumn Width="100" Binding="{Binding Age}" Header="年齢">
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-
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  <DataGridTextColumn.CellStyle>
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-
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  <Style TargetType="{x:Type DataGridCell}">
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-
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+ <Setter Property="BorderThickness" Value="4" />
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  <Style.Triggers>
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-
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  <Trigger Property="IsSelected" Value="True">
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-
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  <Setter Property="Background" Value="#87CEEB" />
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-
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  <Setter Property="Foreground" Value="Black" />
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-
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  </Trigger>
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-
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  <DataTrigger Binding="{Binding IsEditItem}" Value="True">
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-
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  <Setter Property="BorderBrush" Value="Red" />
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-
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  </DataTrigger>
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-
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  <DataTrigger Binding="{Binding DataContext.IsEditMain, RelativeSource={RelativeSource AncestorType={x:Type DataGrid}}}" Value="True">
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-
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  <Setter Property="Foreground" Value="Red" />
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-
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  </DataTrigger>
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-
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  </Style.Triggers>
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-
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  </Style>
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-
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  </DataGridTextColumn.CellStyle>
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-
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  </DataGridTextColumn>
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-
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+ <DataGridTemplateColumn Header="IsEditItem">
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+ <DataGridTemplateColumn.CellTemplate>
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+ <DataTemplate>
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+ <CheckBox VerticalContentAlignment="Center" IsChecked="{Binding IsEditItem, UpdateSourceTrigger=PropertyChanged}" />
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+ </DataTemplate>
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+ </DataGridTemplateColumn.CellTemplate>
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- <DataGridTextColumn
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+ </DataGridTemplateColumn>
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-
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- Binding="{Binding IsEditItem}"
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-
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- Header="IsEditItem"
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-
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- IsReadOnly="True" />
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-
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  </DataGrid.Columns>
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-
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  </DataGrid>
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-
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- </Grid>
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+ </DockPanel>
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-
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  </Window>
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-
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  ```
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-
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-
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- ```C#
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+ ```cs
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-
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  using System.Collections.ObjectModel;
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-
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  using System.Windows;
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-
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  using Livet;
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- using Livet.Commands;
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-
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-
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-
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  namespace Questions241295
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-
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  {
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-
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  public partial class MainWindow : Window
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-
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  {
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-
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  public MainWindow() => InitializeComponent();
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-
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  }
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-
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-
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  public class MainWindowViewModel : ViewModel
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-
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  {
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-
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  public ObservableCollection<Item> Items { get; }
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-
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+ public bool IsEditMain { get => isEdit; set => RaisePropertyChangedIfSet(ref isEdit, value); }
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-
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  private bool isEdit;
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- public bool IsEditMain { get => isEdit; set => RaisePropertyChangedIfSet(ref isEdit, value); }
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-
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-
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-
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- private ViewModelCommand setTrueCommand;
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-
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- public ViewModelCommand SetTrueCommand => setTrueCommand ?? (setTrueCommand = new ViewModelCommand(SetTrue));
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-
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-
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-
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- private ViewModelCommand setFalseCommand;
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-
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- public ViewModelCommand SetFalseCommand => setFalseCommand ?? (setFalseCommand = new ViewModelCommand(SetFalse));
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-
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-
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-
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  public MainWindowViewModel()
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-
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  {
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-
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  Items = new ObservableCollection<Item>
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-
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  {
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-
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  new Item("a", 24),
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-
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- new Item("b", 25)
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+ new Item("b", 25),
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-
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  };
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-
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  }
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-
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-
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-
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- public void SetTrue() => IsEditMain = true;
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-
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- public void SetFalse() => IsEditMain = false;
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-
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  }
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-
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  public class Item : ViewModel
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-
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  {
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-
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+ public string Name { get => name; set => RaisePropertyChangedIfSet(ref name, value); }
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  private string name;
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- public string Name { get => name; set => RaisePropertyChangedIfSet(ref name, value); }
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+ public int Age { get => age; set => RaisePropertyChangedIfSet(ref age, value); }
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-
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-
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-
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  private int age;
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- public int Age { get => age; set => RaisePropertyChangedIfSet(ref age, value); }
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+ public bool IsEditItem { get => isEdit; set => RaisePropertyChangedIfSet(ref isEdit, value); }
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-
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-
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-
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  private bool isEdit;
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94
 
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- public bool IsEditItem { get => isEdit; set => RaisePropertyChangedIfSet(ref isEdit, value); }
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-
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-
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-
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- private ViewModelCommand setTrueCommand;
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-
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- public ViewModelCommand SetTrueCommand => setTrueCommand ?? (setTrueCommand = new ViewModelCommand(SetTrue));
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-
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-
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-
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- private ViewModelCommand setFalseCommand;
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-
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- public ViewModelCommand SetFalseCommand => setFalseCommand ?? (setFalseCommand = new ViewModelCommand(SetFalse));
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-
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-
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-
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95
  public Item(string name, int age) => (Name, Age) = (name, age);
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-
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-
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-
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- public void SetTrue() => IsEditItem = true;
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-
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- public void SetFalse() => IsEditItem = false;
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-
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  }
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-
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  }
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-
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  ```
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99
 
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-
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-
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  * `IsEditItem` 個々のIsEdit（ボーダー赤）
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-
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  * `IsEditMain` 全体のIsEdit（文字赤）
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+ ![アプリ画像](https://ddjkaamml8q8x.cloudfront.net/questions/2023-07-20/acffb10a-5c4a-440a-9941-0243e278201b.png)