回答編集履歴
1
見直しキャンペーン中
answer
CHANGED
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@@ -1,181 +1,181 @@
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まずタイトルの件は、そういう仕様ということになります。
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[Dependency Property Value Precedence - WPF .NET Framework | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/advanced/dependency-property-value-precedence)
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---
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-
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追記いただいた図から再現しようとしたんですが、`ToggleButton3`はトグルしておらずどういう処理なのかわかりませんでした。
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7
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-
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仕方がないのでトグルボタン2個パターンで同じ動きの組、都合４つ使って図に合わせてみました（２個でもできますが、位置の移動等が煩雑になるので^^;
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9
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雑に作ってみたところ、`Trigger`で`IsChecked`を変えるような状況にならず、問題を再現できませんでした（xamlがないとこれ以上検討できそうにないです^^;
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このままでは使い物にならないでしょうが、何かのヒントになれば幸いです。
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```
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<Window
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x:Class="Questions300473.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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Width="450"
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Height="450"
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Closing="Window_Closing"
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Loaded="Window_Loaded">
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<Window.Resources>
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-
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<Style x:Key="ExpanderStyle1" TargetType="{x:Type Expander}">
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<Setter Property="ClipToBounds" Value="True" />
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<Setter Property="Template">
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<Setter.Value>
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<ControlTemplate TargetType="{x:Type Expander}">
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<Border>
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<DockPanel>
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<Grid x:Name="HeaderSite" DockPanel.Dock="Top">
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<ToggleButton
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x:Name="Close2Small"
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HorizontalAlignment="Right"
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VerticalAlignment="Top"
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Content="<"
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IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
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ToolTip="Close→Small" />
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<ToggleButton
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x:Name="Small2Close"
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HorizontalAlignment="Left"
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Content=">"
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IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
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ToolTip="Small→Close"
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Visibility="Hidden" />
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<ToggleButton
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x:Name="Small2Large"
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HorizontalAlignment="Right"
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Content="<"
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ToolTip="Small→Large"
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Visibility="Hidden" />
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<ToggleButton
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x:Name="Large2Small"
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HorizontalAlignment="Left"
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Content=">"
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IsChecked="{Binding IsChecked, Mode=TwoWay, ElementName=Small2Large}"
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ToolTip="Large→Small"
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Visibility="Hidden" />
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</Grid>
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<ContentPresenter
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x:Name="ExpandSite"
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Margin="0,0,-200,0"
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DockPanel.Dock="Bottom"
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Focusable="false"
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Visibility="Collapsed" />
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</DockPanel>
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</Border>
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<ControlTemplate.Triggers>
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<!-- Close->Small -->
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<Trigger SourceName="Close2Small" Property="IsChecked" Value="True">
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<Setter TargetName="Close2Small" Property="IsEnabled" Value="False" />
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<Setter TargetName="Small2Close" Property="Visibility" Value="Visible" />
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<Setter TargetName="Small2Large" Property="Visibility" Value="Visible" />
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</Trigger>
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<!-- Small->Large -->
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<Trigger SourceName="Small2Large" Property="IsChecked" Value="True">
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<Setter TargetName="ExpandSite" Property="Margin" Value="0" />
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<Setter TargetName="Small2Large" Property="Visibility" Value="Hidden" />
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<Setter TargetName="Large2Small" Property="Visibility" Value="Visible" />
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</Trigger>
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<Trigger Property="IsExpanded" Value="True">
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<Setter TargetName="ExpandSite" Property="Visibility" Value="Visible" />
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</Trigger>
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</ControlTemplate.Triggers>
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</ControlTemplate>
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</Setter.Value>
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</Setter>
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</Style>
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</Window.Resources>
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<Grid>
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<Expander
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x:Name="Expander"
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Margin="20"
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HorizontalAlignment="Right"
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Style="{DynamicResource ExpanderStyle1}">
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<Rectangle
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Width="400"
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Height="300"
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Fill="Red" />
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</Expander>
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<!-- 依存関係プロパティ値の優先順位 -->
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<CheckBox
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x:Name="checkBox"
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HorizontalAlignment="Left"
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VerticalAlignment="Top"
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Content="Triggerのテスト">
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<CheckBox.Style>
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<Style TargetType="{x:Type CheckBox}">
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<Style.Triggers>
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<Trigger Property="IsMouseOver" Value="True">
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<Setter Property="IsChecked" Value="True" />
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</Trigger>
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<!-- ↓は無くても同じだがあったとしてもダメ -->
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<!--<Trigger Property="IsMouseOver" Value="False">
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<Setter Property="IsChecked" Value="False" />
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</Trigger>-->
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</Style.Triggers>
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</Style>
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</CheckBox.Style>
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</CheckBox>
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</Grid>
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</Window>
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```
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```
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using System.ComponentModel;
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using System.Windows;
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using System.Windows.Controls.Primitives;
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namespace Questions300473
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{
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public enum ThreeState { Close, Small, Large, }
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public partial class MainWindow : Window
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{
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public MainWindow() => InitializeComponent();
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private void Window_Loaded(object sender, RoutedEventArgs e)
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{
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var Small2Large = Expander.Template.FindName("Small2Large", Expander) as ToggleButton;
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switch(Properties.Settings.Default.ExpanderOpenState)
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{
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default:
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case ThreeState.Close:
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break;
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case ThreeState.Small:
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Expander.IsExpanded = true;
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break;
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case ThreeState.Large:
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Expander.IsExpanded = true;
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Small2Large.IsChecked = true;
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break;
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}
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// 依存関係プロパティ値の優先順位 Triggerのテスト
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// あまりに露骨なので「そりゃそうだ」という気もしますが、
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// ↓を実行するとMouseOverに反応しなくなります。
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//checkBox.IsChecked = true;
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}
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private void Window_Closing(object sender, CancelEventArgs e)
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{
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var Small2Large = Expander.Template.FindName("Small2Large", Expander) as ToggleButton;
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var state = !Expander.IsExpanded ? ThreeState.Close
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: Small2Large.IsChecked == false ? ThreeState.Small
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: ThreeState.Large;
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Properties.Settings.Default.ExpanderOpenState = state;
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Properties.Settings.Default.Save();
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}
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}
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}
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1
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+
まずタイトルの件は、そういう仕様ということになります。
|
|
2
|
+
[Dependency Property Value Precedence - WPF .NET Framework | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/desktop/wpf/advanced/dependency-property-value-precedence)
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3
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+
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4
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---
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|
5
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+
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6
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+
追記いただいた図から再現しようとしたんですが、`ToggleButton3`はトグルしておらずどういう処理なのかわかりませんでした。
|
|
7
|
+
|
|
8
|
+
仕方がないのでトグルボタン2個パターンで同じ動きの組、都合４つ使って図に合わせてみました（２個でもできますが、位置の移動等が煩雑になるので^^;
|
|
9
|
+
雑に作ってみたところ、`Trigger`で`IsChecked`を変えるような状況にならず、問題を再現できませんでした（xamlがないとこれ以上検討できそうにないです^^;
|
|
10
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+
|
|
11
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+
このままでは使い物にならないでしょうが、何かのヒントになれば幸いです。
|
|
12
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+
|
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13
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+
```xml
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14
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+
<Window
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15
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+
x:Class="Questions300473.MainWindow"
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16
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+
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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17
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+
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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18
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Width="450"
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19
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Height="450"
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20
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Closing="Window_Closing"
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21
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Loaded="Window_Loaded">
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22
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<Window.Resources>
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23
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+
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24
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<Style x:Key="ExpanderStyle1" TargetType="{x:Type Expander}">
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25
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<Setter Property="ClipToBounds" Value="True" />
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26
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<Setter Property="Template">
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27
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<Setter.Value>
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28
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<ControlTemplate TargetType="{x:Type Expander}">
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29
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<Border>
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30
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<DockPanel>
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31
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+
<Grid x:Name="HeaderSite" DockPanel.Dock="Top">
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32
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<ToggleButton
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33
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x:Name="Close2Small"
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34
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HorizontalAlignment="Right"
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35
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VerticalAlignment="Top"
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36
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Content="<"
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37
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IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
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38
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ToolTip="Close→Small" />
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39
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<ToggleButton
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40
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x:Name="Small2Close"
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41
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HorizontalAlignment="Left"
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42
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Content=">"
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43
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IsChecked="{Binding IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
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44
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ToolTip="Small→Close"
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45
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Visibility="Hidden" />
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46
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+
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47
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<ToggleButton
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48
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x:Name="Small2Large"
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49
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HorizontalAlignment="Right"
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50
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Content="<"
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51
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ToolTip="Small→Large"
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52
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Visibility="Hidden" />
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53
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<ToggleButton
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54
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x:Name="Large2Small"
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55
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HorizontalAlignment="Left"
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56
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Content=">"
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57
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IsChecked="{Binding IsChecked, Mode=TwoWay, ElementName=Small2Large}"
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58
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ToolTip="Large→Small"
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59
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Visibility="Hidden" />
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60
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</Grid>
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61
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+
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62
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<ContentPresenter
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63
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x:Name="ExpandSite"
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64
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Margin="0,0,-200,0"
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65
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DockPanel.Dock="Bottom"
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Focusable="false"
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67
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Visibility="Collapsed" />
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68
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</DockPanel>
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69
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</Border>
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70
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<ControlTemplate.Triggers>
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71
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<!-- Close->Small -->
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<Trigger SourceName="Close2Small" Property="IsChecked" Value="True">
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<Setter TargetName="Close2Small" Property="IsEnabled" Value="False" />
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<Setter TargetName="Small2Close" Property="Visibility" Value="Visible" />
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75
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<Setter TargetName="Small2Large" Property="Visibility" Value="Visible" />
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76
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</Trigger>
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77
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+
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78
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<!-- Small->Large -->
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79
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<Trigger SourceName="Small2Large" Property="IsChecked" Value="True">
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80
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<Setter TargetName="ExpandSite" Property="Margin" Value="0" />
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81
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<Setter TargetName="Small2Large" Property="Visibility" Value="Hidden" />
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<Setter TargetName="Large2Small" Property="Visibility" Value="Visible" />
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83
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</Trigger>
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84
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+
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85
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<Trigger Property="IsExpanded" Value="True">
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86
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<Setter TargetName="ExpandSite" Property="Visibility" Value="Visible" />
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87
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</Trigger>
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88
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</ControlTemplate.Triggers>
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89
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</ControlTemplate>
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90
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</Setter.Value>
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91
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</Setter>
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92
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</Style>
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93
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</Window.Resources>
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94
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<Grid>
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95
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<Expander
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96
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x:Name="Expander"
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97
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Margin="20"
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98
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HorizontalAlignment="Right"
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99
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Style="{DynamicResource ExpanderStyle1}">
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100
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<Rectangle
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101
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Width="400"
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102
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Height="300"
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103
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Fill="Red" />
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104
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</Expander>
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105
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+
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106
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+
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107
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<!-- 依存関係プロパティ値の優先順位 -->
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108
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<CheckBox
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109
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x:Name="checkBox"
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110
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HorizontalAlignment="Left"
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111
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VerticalAlignment="Top"
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112
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Content="Triggerのテスト">
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113
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<CheckBox.Style>
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114
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<Style TargetType="{x:Type CheckBox}">
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115
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<Style.Triggers>
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116
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<Trigger Property="IsMouseOver" Value="True">
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117
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<Setter Property="IsChecked" Value="True" />
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118
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</Trigger>
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119
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+
<!-- ↓は無くても同じだがあったとしてもダメ -->
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120
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<!--<Trigger Property="IsMouseOver" Value="False">
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121
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<Setter Property="IsChecked" Value="False" />
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122
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</Trigger>-->
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123
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</Style.Triggers>
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124
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</Style>
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125
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</CheckBox.Style>
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126
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</CheckBox>
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127
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</Grid>
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128
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</Window>
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129
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```
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130
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131
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```cs
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132
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using System.ComponentModel;
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|
133
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+
using System.Windows;
|
|
134
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+
using System.Windows.Controls.Primitives;
|
|
135
|
+
|
|
136
|
+
namespace Questions300473
|
|
137
|
+
{
|
|
138
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+
public enum ThreeState { Close, Small, Large, }
|
|
139
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+
|
|
140
|
+
public partial class MainWindow : Window
|
|
141
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+
{
|
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142
|
+
public MainWindow() => InitializeComponent();
|
|
143
|
+
|
|
144
|
+
private void Window_Loaded(object sender, RoutedEventArgs e)
|
|
145
|
+
{
|
|
146
|
+
var Small2Large = Expander.Template.FindName("Small2Large", Expander) as ToggleButton;
|
|
147
|
+
|
|
148
|
+
switch(Properties.Settings.Default.ExpanderOpenState)
|
|
149
|
+
{
|
|
150
|
+
default:
|
|
151
|
+
case ThreeState.Close:
|
|
152
|
+
break;
|
|
153
|
+
case ThreeState.Small:
|
|
154
|
+
Expander.IsExpanded = true;
|
|
155
|
+
break;
|
|
156
|
+
case ThreeState.Large:
|
|
157
|
+
Expander.IsExpanded = true;
|
|
158
|
+
Small2Large.IsChecked = true;
|
|
159
|
+
break;
|
|
160
|
+
}
|
|
161
|
+
|
|
162
|
+
|
|
163
|
+
// 依存関係プロパティ値の優先順位 Triggerのテスト
|
|
164
|
+
// あまりに露骨なので「そりゃそうだ」という気もしますが、
|
|
165
|
+
// ↓を実行するとMouseOverに反応しなくなります。
|
|
166
|
+
//checkBox.IsChecked = true;
|
|
167
|
+
}
|
|
168
|
+
|
|
169
|
+
private void Window_Closing(object sender, CancelEventArgs e)
|
|
170
|
+
{
|
|
171
|
+
var Small2Large = Expander.Template.FindName("Small2Large", Expander) as ToggleButton;
|
|
172
|
+
var state = !Expander.IsExpanded ? ThreeState.Close
|
|
173
|
+
: Small2Large.IsChecked == false ? ThreeState.Small
|
|
174
|
+
: ThreeState.Large;
|
|
175
|
+
|
|
176
|
+
Properties.Settings.Default.ExpanderOpenState = state;
|
|
177
|
+
Properties.Settings.Default.Save();
|
|
178
|
+
}
|
|
179
|
+
}
|
|
180
|
+
}
|
|
181
181
|
```
|