ComboBox
テンプレートはwhen TextBox
is IsEditable
true を使用します。したがって、テンプレートを置き換えて に設定するかCharacterCasing
、名前 ("PART_EditableTextBox") でTextBox
を検索してプロパティを設定する添付プロパティを作成することができます。TextBox
CharacterCasing
添付プロパティ ソリューションの簡単な実装を次に示します。
public static class ComboBoxBehavior
{
[AttachedPropertyBrowsableForType(typeof(ComboBox))]
public static CharacterCasing GetCharacterCasing(ComboBox comboBox)
{
return (CharacterCasing)comboBox.GetValue(CharacterCasingProperty);
}
public static void SetCharacterCasing(ComboBox comboBox, CharacterCasing value)
{
comboBox.SetValue(CharacterCasingProperty, value);
}
// Using a DependencyProperty as the backing store for CharacterCasing. This enables animation, styling, binding, etc...
public static readonly DependencyProperty CharacterCasingProperty =
DependencyProperty.RegisterAttached(
"CharacterCasing",
typeof(CharacterCasing),
typeof(ComboBoxBehavior),
new UIPropertyMetadata(
CharacterCasing.Normal,
OnCharacterCasingChanged));
private static void OnCharacterCasingChanged(DependencyObject o, DependencyPropertyChangedEventArgs e)
{
var comboBox = o as ComboBox;
if (comboBox == null)
return;
if (comboBox.IsLoaded)
{
ApplyCharacterCasing(comboBox);
}
else
{
// To avoid multiple event subscription
comboBox.Loaded -= new RoutedEventHandler(comboBox_Loaded);
comboBox.Loaded += new RoutedEventHandler(comboBox_Loaded);
}
}
private static void comboBox_Loaded(object sender, RoutedEventArgs e)
{
var comboBox = sender as ComboBox;
if (comboBox == null)
return;
ApplyCharacterCasing(comboBox);
comboBox.Loaded -= comboBox_Loaded;
}
private static void ApplyCharacterCasing(ComboBox comboBox)
{
var textBox = comboBox.Template.FindName("PART_EditableTextBox", comboBox) as TextBox;
if (textBox != null)
{
textBox.CharacterCasing = GetCharacterCasing(comboBox);
}
}
}
そして、これを使用する方法は次のとおりです。
<ComboBox ItemsSource="{Binding Items}"
IsEditable="True"
local:ComboBoxBehavior.CharacterCasing="Upper">
...