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トップC#に関する質問DataTriggerでTagを参照

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1

見直しキャンペーン中

2023/07/26 13:15

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TN8001
TN8001

スコア9326

test CHANGED
@@ -1,247 +1,124 @@
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  あまり自信がありませんが、こういうことでしょうか？
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- ```xaml
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+ ```xml
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  <Window
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  x:Class="Questions316881.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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  xmlns:behaviors="http://schemas.microsoft.com/xaml/behaviors"
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  Width="800"
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  Height="450">
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  <Window.Resources>
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-
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  <!--<ControlTemplate x:Key="ButtonTemplate" TargetType="Button">
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  <Grid>
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  <StackPanel>
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  <Ellipse Height="100">
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  <Ellipse.Resources>
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  <Style TargetType="Ellipse">
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  <Setter Property="Fill" Value="Gray" />
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  <Style.Triggers>
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  <DataTrigger Binding="{Binding Tag, RelativeSource={RelativeSource TemplatedParent}}" Value="赤丸">
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  <Setter Property="Fill" Value="Red" />
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  </DataTrigger>
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  <DataTrigger Binding="{Binding Tag, RelativeSource={RelativeSource TemplatedParent}}" Value="緑丸">
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  <Setter Property="Fill" Value="Green" />
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  </DataTrigger>
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  <DataTrigger Binding="{Binding Tag, RelativeSource={RelativeSource TemplatedParent}}" Value="青丸">
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  <Setter Property="Fill" Value="Blue" />
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  </DataTrigger>
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  </Style.Triggers>
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  </Style>
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  </Ellipse.Resources>
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  </Ellipse>
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  <Rectangle Height="100" Fill="Gray" />
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  <Label Content="{TemplateBinding Tag}" />
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  </StackPanel>
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  <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
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  </Grid>
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  </ControlTemplate>-->
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  <!-- ↑これでも動きますが、↓の方が少し短いしわかりやすそうです -->
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  <ControlTemplate x:Key="ButtonTemplate" TargetType="Button">
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  <Grid>
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  <StackPanel>
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  <Ellipse
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  x:Name="ellipse"
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  Height="100"
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  Fill="Gray" />
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  <Rectangle Height="100" Fill="Gray" />
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  <Label Content="{TemplateBinding Tag}" />
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  </StackPanel>
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  <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
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  </Grid>
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  <ControlTemplate.Triggers>
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  <Trigger Property="Tag" Value="赤丸">
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  <Setter TargetName="ellipse" Property="Fill" Value="Red" />
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  </Trigger>
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  <Trigger Property="Tag" Value="緑丸">
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  <Setter TargetName="ellipse" Property="Fill" Value="Green" />
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  </Trigger>
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  <Trigger Property="Tag" Value="青丸">
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  <Setter TargetName="ellipse" Property="Fill" Value="Blue" />
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  </Trigger>
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  </ControlTemplate.Triggers>
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  </ControlTemplate>
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  </Window.Resources>
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  <StackPanel
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  HorizontalAlignment="Center"
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  VerticalAlignment="Center"
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  Orientation="Horizontal">
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+ <Button
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+ Content="ButtonA"
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+ Tag="{Binding ButtonAFlag}"
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+ Template="{StaticResource ButtonTemplate}">
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+ <behaviors:Interaction.Triggers>
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+ <behaviors:EventTrigger EventName="PreviewMouseLeftButtonUp">
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+ <behaviors:CallMethodAction MethodName="ButtonAOn" TargetObject="{Binding}" />
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+ </behaviors:EventTrigger>
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+ </behaviors:Interaction.Triggers>
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+ </Button>
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  <Button
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- Content="ButtonA"
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+ Content="ButtonB"
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- Tag="{Binding ButtonAFlag}"
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+ Tag="{Binding ButtonBFlag}"
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  Template="{StaticResource ButtonTemplate}">
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  <behaviors:Interaction.Triggers>
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  <behaviors:EventTrigger EventName="PreviewMouseLeftButtonUp">
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- <behaviors:CallMethodAction MethodName="ButtonAOn" TargetObject="{Binding}" />
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+ <behaviors:CallMethodAction MethodName="ButtonBOn" TargetObject="{Binding}" />
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  </behaviors:EventTrigger>
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  </behaviors:Interaction.Triggers>
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  </Button>
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- <Button
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- Content="ButtonB"
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- Tag="{Binding ButtonBFlag}"
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- Template="{StaticResource ButtonTemplate}">
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- <behaviors:Interaction.Triggers>
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- <behaviors:EventTrigger EventName="PreviewMouseLeftButtonUp">
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- <behaviors:CallMethodAction MethodName="ButtonBOn" TargetObject="{Binding}" />
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- </behaviors:EventTrigger>
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- </behaviors:Interaction.Triggers>
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- </Button>
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  </StackPanel>
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  </Window>
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  ```
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- ```C#
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+ ```cs
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  using Livet;
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  using System.Windows;
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  namespace Questions316881
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  {
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  public class MainViewModel : ViewModel
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  {
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  private string _ButtonAFlag = "赤丸";
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  public string ButtonAFlag { get => _ButtonAFlag; set => RaisePropertyChangedIfSet(ref _ButtonAFlag, value); }
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  private string _ButtonBFlag = "青丸";
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  public string ButtonBFlag { get => _ButtonBFlag; set => RaisePropertyChangedIfSet(ref _ButtonBFlag, value); }
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  public void ButtonAOn() => ButtonAFlag = ButtonAFlag == "赤丸" ? "緑丸" : "赤丸";
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  public void ButtonBOn() => ButtonBFlag = ButtonBFlag == "青丸" ? "緑丸" : "青丸";
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  }
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  public partial class MainWindow : Window
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  {
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  public MainWindow()
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  {
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  InitializeComponent();
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  DataContext = new MainViewModel();
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  }
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  }
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  }
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  ```