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Allow triple left click on a TextBox to select all text #4081

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1fa00c2
Allow triple left click on a TextBox to select all text
JLdgu Aug 13, 2026
fc516bc
Update src/MaterialDesignThemes.Wpf/TextFieldAssist.cs
JLdgu Aug 17, 2026
3fb4d21
Update src/MaterialDesignThemes.Wpf/TextFieldAssist.cs
JLdgu Aug 17, 2026
9c96e67
Add test to ensure that when triple click false not all text is selected
JLdgu Aug 17, 2026
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26 changes: 16 additions & 10 deletions src/MainDemo.Wpf/Fields.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -148,7 +148,14 @@
Style="{StaticResource MaterialDesignFloatingHintTextBox}"
Text="Some Text" />
</smtx:XamlDisplay>
</DockPanel>

<DockPanel Style="{StaticResource FieldDockPanel}">
<smtx:XamlDisplay UniqueKey="fields_2">
<TextBox materialDesign:TextFieldAssist.SelectAllOnTripleClick="True"
Style="{StaticResource MaterialDesignTextBox}"
Text="Triple click to select all text" />
</smtx:XamlDisplay>
</DockPanel>

<DockPanel Style="{StaticResource FieldDockPanel}">
Expand Down Expand Up @@ -182,18 +189,18 @@
<CheckBox x:Name="TextBoxWrapTextCheckBox"
Content="Wrap text"
IsChecked="True" />

<TextBox Grid.Row="1"
Height="80"
MinWidth="280"
VerticalAlignment="Stretch"
materialDesign:HintAssist.Hint="Multiline text"
AcceptsReturn="True"
HorizontalScrollBarVisibility="Auto"
SpellCheck.IsEnabled="True"
Text="Multiline. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. The quick brown fox jumps over the lazy dog. War and peace. Keep going. Go on. For how long? Not long. Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua."
TextWrapping="{Binding ElementName=TextBoxWrapTextCheckBox, Path=IsChecked, Converter={StaticResource BoolToTextWrappingConverter}}"
VerticalScrollBarVisibility="Auto"
HorizontalScrollBarVisibility="Auto"/>
VerticalScrollBarVisibility="Auto" />
</Grid>
</smtx:XamlDisplay>

Expand Down Expand Up @@ -690,12 +697,11 @@
<TextBlock Style="{StaticResource PageSectionTitleTextBlock}" Text="Custom Background" />

<WrapPanel Margin="0,0,0,32" Background="Chocolate">
<smtx:XamlDisplay Margin="16"
UniqueKey="fields_custom_background_1">
<smtx:XamlDisplay Margin="16" UniqueKey="fields_custom_background_1">
<TextBox Width="200"
Style="{StaticResource MaterialDesignOutlinedTextBox}"
materialDesign:HintAssist.Hint="Hint text"
materialDesign:HintAssist.HintPaddingBrush="Chocolate" />
materialDesign:HintAssist.HintPaddingBrush="Chocolate"
Style="{StaticResource MaterialDesignOutlinedTextBox}" />
<!-- Set HintAssist.HintPaddingBrush to match the custom background to get correct coloring of the hint padding (when floated) -->
</smtx:XamlDisplay>
</WrapPanel>
Expand All @@ -704,7 +710,7 @@
<TextBlock Style="{StaticResource PageSectionTitleTextBlock}" Text="AutoSuggestBox" />

<WrapPanel>
<StackPanel Width="256" Margin="0,0,16,16">
<StackPanel Width="256" Margin="0,0,16,16">
<TextBlock Margin="0,0,0,8"
VerticalAlignment="Center"
Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
Expand All @@ -719,7 +725,7 @@
</smtx:XamlDisplay>
</StackPanel>

<StackPanel Width="256" Margin="0,0,16,16">
<StackPanel Width="256" Margin="0,0,16,16">
<TextBlock Margin="0,0,0,8"
Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
Text="AutoSuggestBox with ItemTemplate" />
Expand Down Expand Up @@ -774,7 +780,7 @@
</smtx:XamlDisplay>
</StackPanel>

<StackPanel Width="256" Margin="0,0,16,16">
<StackPanel Width="256" Margin="0,0,16,16">
<TextBlock Margin="0,0,0,8"
Style="{StaticResource MaterialDesignSubtitle1TextBlock}"
Text="Outlined AutoSuggestBox" />
Expand Down
13 changes: 11 additions & 2 deletions src/MaterialDesign3.Demo.Wpf/Fields.xaml
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Original file line number Diff line number Diff line change
Expand Up @@ -43,7 +43,7 @@
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="155" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="155" />
<ColumnDefinition Width="190" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>

Expand All @@ -54,6 +54,7 @@
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>

<TextBlock Grid.Row="0"
Expand Down Expand Up @@ -164,14 +165,22 @@
</smtx:XamlDisplay>

<smtx:XamlDisplay Grid.Row="4"
Grid.Column="3"
UniqueKey="fields_2">
<TextBox materialDesign:TextFieldAssist.SelectAllOnTripleClick="True"
Style="{StaticResource MaterialDesignTextBox}"
Text="Triple click to select all text" />
</smtx:XamlDisplay>

<smtx:XamlDisplay Grid.Row="5"
Grid.Column="3"
UniqueKey="fields_13">
<TextBox MinWidth="72"
materialDesign:HintAssist.Hint="I'm Disabled"
IsEnabled="False" />
</smtx:XamlDisplay>

<smtx:XamlDisplay Grid.Row="5"
<smtx:XamlDisplay Grid.Row="6"
Grid.Column="3"
UniqueKey="fields_15">
<PasswordBox MinWidth="72"
Expand Down
39 changes: 39 additions & 0 deletions src/MaterialDesignThemes.Wpf/TextFieldAssist.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -150,6 +150,45 @@ public static class TextFieldAssist

public static bool GetIncludeSpellingSuggestions(TextBoxBase element) => (bool)element.GetValue(IncludeSpellingSuggestionsProperty);

/// <summary>
/// Allow triple click to select all text in a TextBox.
/// </summary>
public static readonly DependencyProperty SelectAllOnTripleClickProperty =
DependencyProperty.RegisterAttached(
"SelectAllOnTripleClick",
typeof(bool),
typeof(TextFieldAssist),
new PropertyMetadata(false, OnSelectAllOnTripleClickChanged));

public static bool GetSelectAllOnTripleClick(DependencyObject obj) =>
(bool)obj.GetValue(SelectAllOnTripleClickProperty);

public static void SetSelectAllOnTripleClick(DependencyObject obj, bool value) =>
obj.SetValue(SelectAllOnTripleClickProperty, value);

private static void OnSelectAllOnTripleClickChanged(
DependencyObject d,
DependencyPropertyChangedEventArgs e)
{
if (d is TextBoxBase textBox)
{
if ((bool)e.NewValue)
textBox.PreviewMouseLeftButtonDown += TextBox_PreviewMouseLeftButtonDown;
else
textBox.PreviewMouseLeftButtonDown -= TextBox_PreviewMouseLeftButtonDown;
}
}

private static void TextBox_PreviewMouseLeftButtonDown(
object sender,
MouseButtonEventArgs e)
{
if (e.ClickCount == 3 && sender is TextBoxBase textBox)
{
textBox.SelectAll();
e.Handled = true;
}
}
/// <summary>
/// SuffixText dependency property
/// </summary>
Expand Down
44 changes: 44 additions & 0 deletions tests/MaterialDesignThemes.UITests/WPF/TextBoxes/TextBoxTests.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -497,6 +497,50 @@ public async Task TextBox_MultiLineAndFixedHeight_RespectsVerticalContentAlignme
await Assert.That(await contentGrid.GetVerticalAlignment()).IsEqualTo(expectedFloatingHintAlignment);
}

[Test]
public async Task TextBox_WithSelectAllOnTripleClick_False_DoesNotSelectAllText()
{
var textBox = await LoadXaml<TextBox>($$"""
<TextBox Style="{StaticResource MaterialDesignFilledTextBox}"
Text="Some text to select"
materialDesign:TextFieldAssist.SelectAllOnTripleClick="False"
Width="200" VerticalAlignment="Center" HorizontalAlignment="Center" />
""");

await textBox.LeftClick();
await textBox.LeftClick();
await textBox.LeftClick();

await Wait.For(async () =>
{
string? selectedText = await textBox.GetSelectedText();

await Assert.That(selectedText).IsEqualTo("select");
});
}

[Test]
public async Task TextBox_WithSelectAllOnTripleClick_True_SelectsAllText()
{
var textBox = await LoadXaml<TextBox>($$"""
<TextBox Style="{StaticResource MaterialDesignFilledTextBox}"
Text="Some text to select"
materialDesign:TextFieldAssist.SelectAllOnTripleClick="True"
Width="200" VerticalAlignment="Center" HorizontalAlignment="Center" />
""");

await textBox.LeftClick();
await textBox.LeftClick();
await textBox.LeftClick();

await Wait.For(async () =>
{
string? selectedText = await textBox.GetSelectedText();

await Assert.That(selectedText).IsEqualTo("Some text to select");
});
}

[Test]
[Description("Issue 3176")]
public async Task ValidationErrorTemplate_WithChangingErrors_UpdatesValidation()
Expand Down