回答編集履歴
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見直しキャンペーン中
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[C# - 【WPF】IsEditableなコンボボックスでのアイテム選択時にテキストの全選択を行わせない｜teratail](https://teratail.com/questions/90170)
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↑で0,0にすれば先頭には来ますが、`IsTextSearchEnabled=true`（デフォルト）だと挙動が非常に気持ち悪いです。
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`DropDownClosed`でやると気持ち悪さはないですが、一瞬選択が見えてしまいます。
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もうちょっといい方法もありそうですが。。。
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---
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追記 「気持ち悪さ」について説明不足に感じたので検証コード
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文章で説明しずらいので、実行してもらったほうが早いです。
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各コンボボックスで、空の状態で`a`を数文字打つとどういうことかわかります。
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```x
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```xml
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<Window
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x:Class="Questions303065.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="800"
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Height="450">
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<StackPanel>
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<GroupBox Header="IsTextSearchEnabled=True">
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<ComboBox IsEditable="True" SelectionChanged="ComboBox_SelectionChanged">
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<ComboBoxItem>aa</ComboBoxItem>
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<ComboBoxItem>aaaa</ComboBoxItem>
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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<GroupBox Header="IsTextSearchEnabled=False">
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<ComboBox
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IsEditable="True"
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IsTextSearchEnabled="False"
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SelectionChanged="ComboBox_SelectionChanged">
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<ComboBoxItem>aa</ComboBoxItem>
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<ComboBoxItem>aaaa</ComboBoxItem>
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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<GroupBox Header="DropDownClosed">
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<ComboBox DropDownClosed="ComboBox_DropDownClosed" IsEditable="True">
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<ComboBoxItem>aa</ComboBoxItem>
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<ComboBoxItem>aaaa</ComboBoxItem>
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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</StackPanel>
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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.Windows;
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using System.Windows.Controls;
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namespace Questions303065
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{
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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 ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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var comboBox = (ComboBox)sender;
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if(comboBox.Template?.FindName("PART_EditableTextBox", comboBox) is TextBox textBox)
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{
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Dispatcher.InvokeAsync(() => textBox.Select(0, 0));
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}
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}
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private void ComboBox_DropDownClosed(object sender, EventArgs e)
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{
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var comboBox = (ComboBox)sender;
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if(comboBox.Template?.FindName("PART_EditableTextBox", comboBox) is TextBox textBox)
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{
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Dispatcher.InvokeAsync(() => textBox.Select(0, 0));
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}
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}
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}
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}
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```
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1
追記 「気持ち悪さ」について説明
test
CHANGED
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@@ -7,3 +7,153 @@
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7
7
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`DropDownClosed`でやると気持ち悪さはないですが、一瞬選択が見えてしまいます。
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8
8
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9
9
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もうちょっといい方法もありそうですが。。。
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10
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+
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11
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+
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12
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13
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---
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14
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+
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15
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+
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16
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+
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17
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+
追記 「気持ち悪さ」について説明不足に感じたので検証コード
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18
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+
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19
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+
|
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20
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+
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21
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+
文章で説明しずらいので、実行してもらったほうが早いです。
|
|
22
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+
|
|
23
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+
各コンボボックスで、空の状態で`a`を数文字打つとどういうことかわかります。
|
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24
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+
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25
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+
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26
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+
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27
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+
```xaml
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+
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<Window
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+
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x:Class="Questions303065.MainWindow"
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+
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xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
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34
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+
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xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
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36
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Width="800"
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Height="450">
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40
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+
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<StackPanel>
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+
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43
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<GroupBox Header="IsTextSearchEnabled=True">
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44
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+
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45
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<ComboBox IsEditable="True" SelectionChanged="ComboBox_SelectionChanged">
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+
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47
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<ComboBoxItem>aa</ComboBoxItem>
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48
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+
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49
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<ComboBoxItem>aaaa</ComboBoxItem>
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+
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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<GroupBox Header="IsTextSearchEnabled=False">
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<ComboBox
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IsEditable="True"
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IsTextSearchEnabled="False"
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SelectionChanged="ComboBox_SelectionChanged">
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<ComboBoxItem>aa</ComboBoxItem>
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<ComboBoxItem>aaaa</ComboBoxItem>
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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<GroupBox Header="DropDownClosed">
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<ComboBox DropDownClosed="ComboBox_DropDownClosed" IsEditable="True">
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<ComboBoxItem>aa</ComboBoxItem>
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<ComboBoxItem>aaaa</ComboBoxItem>
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<ComboBoxItem>bb</ComboBoxItem>
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</ComboBox>
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</GroupBox>
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</StackPanel>
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</Window>
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```
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```C#
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using System;
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using System.Windows;
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using System.Windows.Controls;
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namespace Questions303065
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{
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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 ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
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{
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var comboBox = (ComboBox)sender;
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if(comboBox.Template?.FindName("PART_EditableTextBox", comboBox) is TextBox textBox)
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{
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Dispatcher.InvokeAsync(() => textBox.Select(0, 0));
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}
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}
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private void ComboBox_DropDownClosed(object sender, EventArgs e)
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{
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var comboBox = (ComboBox)sender;
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if(comboBox.Template?.FindName("PART_EditableTextBox", comboBox) is TextBox textBox)
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{
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Dispatcher.InvokeAsync(() => textBox.Select(0, 0));
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}
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}
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}
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}
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```
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