回答編集履歴
2
見直しキャンペーン中
test
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MahApps.Metroの`MetroTabControl`が、`TabItem`のキャッシュに対応していました（ちゃんとやるとなるとxamlも長くなるし、正しく書く自信もないのでどうしようかと思っていたところでした^^;
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[NuGet Gallery | MahApps.Metro 2.4.3](https://www.nuget.org/packages/MahApps.Metro/2.4.3?_src=template)
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もしくは`MetroTabControl`が依存している、
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もしくは`MetroTabControl`が依存している、ControlzExの`TabControlEx`でもいいと思います（未確認）
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[NuGet Gallery | ControlzEx 4.4.0](https://www.nuget.org/packages/ControlzEx/)
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[TabControlEx](https://github.com/ControlzEx/ControlzEx#tabcontrolex)
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1
見直しキャンペーン中
test
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@@ -1,347 +1,174 @@
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`MahApps.Metro`の`MetroTabControl`が、`TabItem`のキャッシュに対応していました（ちゃんとやるとなるとxamlも長くなるし、正しく書く自信もないのでどうしようかと思っていたところでした^^;
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[NuGet Gallery | MahApps.Metro 2.4.3](https://www.nuget.org/packages/MahApps.Metro/2.4.3?_src=template)
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もしくは`MetroTabControl`が依存している、`ControlzEx`の`TabControlEx`でもいいと思います（未確認）
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[NuGet Gallery | ControlzEx 4.4.0](https://www.nuget.org/packages/ControlzEx/)
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[TabControlEx](https://github.com/ControlzEx/ControlzEx#tabcontrolex)
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やっていることは↓とほぼ同じなので、ライブラリを使用したくない場合はこれをベースにしてください（ちょっと甘いところがあるので要調整）
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[c# - Stop TabControl from recreating its children - Stack Overflow](https://stackoverflow.com/questions/9794151/stop-tabcontrol-from-recreating-its-children/9802346#9802346)
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次はフォーカスですが↓はベタ置き専用になっていますので、`ItemsSource`と両対応＆添付ビヘイビア化しました。
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[TabControlでのTab切り替え時フォーカス設定](https://social.msdn.microsoft.com/Forums/ja-JP/e1f77d05-3358-4d63-8810-165300b22f24/tabcontrol1239112398tab209991242626367123602617812501124571254012459?forum=wpfja)
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簡単に試した限りは動いていますが、突っ込んだテストはしていません（間違えるほど大したことはしていないので、大丈夫だとは思いますが^^;
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```x
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```xml
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<Window
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x:Class="Questions318528.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:local="clr-namespace:Questions318528"
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xmlns:mah="http://metro.mahapps.com/winfx/xaml/controls"
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Width="800"
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Height="450">
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<Grid>
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<mah:MetroTabControl
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local:TabItemKeepFocusBehavior.Use="True"
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ItemsSource="{Binding Tabs}"
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KeepVisualTreeInMemoryWhenChangingTabs="True">
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<TabControl.Resources>
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<DataTemplate DataType="{x:Type local:TabItem1}">
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<ScrollViewer>
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<StackPanel>
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<TextBlock Text="View1" />
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<TextBox />
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<Image Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg" />
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<TextBox />
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<Image Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg" />
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<TextBox />
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</StackPanel>
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</ScrollViewer>
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</DataTemplate>
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<DataTemplate DataType="{x:Type local:TabItem2}">
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<ScrollViewer>
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<StackPanel>
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<TextBlock Text="View2" />
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<TextBox />
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<Image Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg" />
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<TextBox />
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<Image Source="https://teratail-v2.storage.googleapis.com/uploads/avatars/u13/132786/KnkDDC5A_thumbnail.jpg" />
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<TextBox />
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</StackPanel>
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</ScrollViewer>
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</DataTemplate>
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</TabControl.Resources>
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<TabControl.ItemTemplate>
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<DataTemplate>
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<TextBlock Text="header" />
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</DataTemplate>
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</TabControl.ItemTemplate>
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</mah:MetroTabControl>
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</Grid>
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</Window>
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```
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```
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```cs
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using System;
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using System.Collections.ObjectModel;
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using System.Windows;
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using System.Windows.Controls;
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using System.Windows.Input;
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using System.Windows.Threading;
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namespace Questions318528
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{
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public class TabItem1 { }
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public class TabItem2 { }
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public partial class MainWindow : Window
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{
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public ObservableCollection<object> Tabs { get; }
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public MainWindow()
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{
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InitializeComponent();
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DataContext = this;
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Tabs = new()
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{
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new TabItem1(),
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new TabItem2(),
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"aaa",
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};
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}
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}
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96
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// [TabControlでのTab切り替え時フォーカス設定](https://social.msdn.microsoft.com/Forums/ja-JP/e1f77d05-3358-4d63-8810-165300b22f24/tabcontrol1239112398tab209991242626367123602617812501124571254012459?forum=wpfja)
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// を参考に添付ビヘイビア化
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internal class TabItemKeepFocusBehavior
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{
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// 内部使用添付プロパティ TabItemに添付 フォーカスがあったエレメント
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private static readonly DependencyProperty FocusedProperty
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= DependencyProperty.RegisterAttached("Focused", typeof(IInputElement), typeof(TabItemKeepFocusBehavior),
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new PropertyMetadata(null));
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private static IInputElement GetFocused(DependencyObject target) => (IInputElement)target.GetValue(FocusedProperty);
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private static void SetFocused(DependencyObject target, IInputElement value) => target.SetValue(FocusedProperty, value);
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107
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// 添付ビヘイビア TabControlに添付 フォーカス戻しを使用するかどうか
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public static readonly DependencyProperty UseProperty
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= DependencyProperty.RegisterAttached("Use", typeof(bool), typeof(TabItemKeepFocusBehavior),
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new PropertyMetadata(false, OnUseChanged));
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public static bool GetUse(DependencyObject target) => (bool)target.GetValue(UseProperty);
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public static void SetUse(DependencyObject target, bool value) => target.SetValue(UseProperty, value);
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private static void OnUseChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
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{
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if (sender is TabControl tabControl)
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{
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if ((bool)e.NewValue)
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{
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tabControl.PreviewGotKeyboardFocus += TabControl_PreviewGotKeyboardFocus;
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ne
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tabControl.SelectionChanged += TabControl_SelectionChanged;
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"aaa",
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}
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}
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else
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{
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tabControl.PreviewGotKeyboardFocus -= TabControl_PreviewGotKeyboardFocus;
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tabControl.SelectionChanged -= TabControl_SelectionChanged;
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}
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}
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}
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// フォーカスを得るたびにFocusedにセット
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private static void TabControl_PreviewGotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
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{
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if (sender is TabControl tabControl)
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{
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if (e.NewFocus is TabItem) return;
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138
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var tabItem = tabControl.SelectedItem as TabItem ?? tabControl.ItemContainerGenerator.ContainerFromItem(tabControl.SelectedItem) as TabItem;
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if (tabItem == null) return;
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// [TabControlでのTab切り替え時フォーカス設定](https://social.msdn.microsoft.com/Forums/ja-JP/e1f77d05-3358-4d63-8810-165300b22f24/tabcontrol1239112398tab209991242626367123602617812501124571254012459?forum=wpfja)
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// を参考に添付ビヘイビア化
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internal class TabItemKeepFocusBehavior
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{
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// 内部使用添付プロパティ TabItemに添付 フォーカスがあったエレメント
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private static readonly DependencyProperty FocusedProperty
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= DependencyProperty.RegisterAttached("Focused", typeof(IInputElement), typeof(TabItemKeepFocusBehavior),
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new PropertyMetadata(null));
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private static IInputElement GetFocused(DependencyObject target) => (IInputElement)target.GetValue(FocusedProperty);
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private static void SetFocused(DependencyObject target, IInputElement value) => target.SetValue(FocusedProperty, value);
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// 添付ビヘイビア TabControlに添付 フォーカス戻しを使用するかどうか
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public static readonly DependencyProperty UseProperty
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= DependencyProperty.RegisterAttached("Use", typeof(bool), typeof(TabItemKeepFocusBehavior),
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new PropertyMetadata(false, OnUseChanged));
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public static bool GetUse(DependencyObject target) => (bool)target.GetValue(UseProperty);
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public static void SetUse(DependencyObject target, bool value) => target.SetValue(UseProperty, value);
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private static void OnUseChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
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{
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if (sender is TabControl tabControl)
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{
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if ((bool)e.NewValue)
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if (e.NewFocus is IInputElement element)
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{
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tabControl.PreviewGotKeyboardFocus += TabControl_PreviewGotKeyboardFocus;
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SetFocused(tabItem, element);
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}
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else
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{
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tabControl.PreviewGotKeyboardFocus -= TabControl_PreviewGotKeyboardFocus;
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tabControl.SelectionChanged -= TabControl_SelectionChanged;
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}
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}
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}
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//
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// 選択が変わったときにFocusedにフォーカス
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private static void TabControl_
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private static void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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if (sender is TabControl tabControl)
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{
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if (e.NewFocus is TabItem) return;
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var tabItem = tabControl.SelectedItem as TabItem ?? tabControl.ItemContainerGenerator.ContainerFromItem(tabControl.SelectedItem) as TabItem;
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if (tabItem == null) return;
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|
|
283
|
-
if (e
|
|
157
|
+
if (GetFocused(tabItem) is IInputElement element)
|
|
284
|
-
|
|
285
158
|
{
|
|
286
|
-
|
|
287
|
-
|
|
159
|
+
Action action = () => element.Focus();
|
|
288
|
-
|
|
160
|
+
tabControl.Dispatcher.BeginInvoke(action, DispatcherPriority.Input);
|
|
289
161
|
}
|
|
290
|
-
|
|
291
162
|
}
|
|
292
|
-
|
|
293
163
|
}
|
|
294
|
-
|
|
295
|
-
|
|
296
|
-
|
|
297
|
-
// 選択が変わったときにFocusedにフォーカス
|
|
298
|
-
|
|
299
|
-
private static void TabControl_SelectionChanged(object sender, SelectionChangedEventArgs e)
|
|
300
|
-
|
|
301
|
-
{
|
|
302
|
-
|
|
303
|
-
if (sender is TabControl tabControl)
|
|
304
|
-
|
|
305
|
-
{
|
|
306
|
-
|
|
307
|
-
var tabItem = tabControl.SelectedItem as TabItem ?? tabControl.ItemContainerGenerator.ContainerFromItem(tabControl.SelectedItem) as TabItem;
|
|
308
|
-
|
|
309
|
-
if (tabItem == null) return;
|
|
310
|
-
|
|
311
|
-
|
|
312
|
-
|
|
313
|
-
if (GetFocused(tabItem) is IInputElement element)
|
|
314
|
-
|
|
315
|
-
{
|
|
316
|
-
|
|
317
|
-
Action action = () => element.Focus();
|
|
318
|
-
|
|
319
|
-
tabControl.Dispatcher.BeginInvoke(action, DispatcherPriority.Input);
|
|
320
|
-
|
|
321
|
-
}
|
|
322
|
-
|
|
323
|
-
}
|
|
324
|
-
|
|
325
|
-
}
|
|
326
|
-
|
|
327
164
|
}
|
|
328
|
-
|
|
329
165
|
}
|
|
330
|
-
|
|
331
166
|
```
|
|
332
|
-
|
|
333
|
-
|
|
334
167
|
|
|
335
168
|
---
|
|
336
169
|
|
|
337
|
-
|
|
338
|
-
|
|
339
170
|
特に指定がないので.NET 5.0で書きました^^
|
|
340
|
-
|
|
341
171
|
.NET Framework 4.8等では、new()でエラーが出るので型を書いてください。
|
|
342
172
|
|
|
343
|
-
|
|
344
|
-
|
|
345
173
|
[Target-typed new expressions - C# 9.0 specification proposals | Microsoft Docs](https://docs.microsoft.com/ja-jp/dotnet/csharp/language-reference/proposals/csharp-9.0/target-typed-new)
|
|
346
|
-
|
|
347
174
|
[ターゲットからの new 型推論 | ++C++; // 未確認飛行 C](https://ufcpp.net/study/csharp/oo_construct.html#target-typed-new)
|