Introduction
This artice demonstrates how to create style for a combobox to make its corner round in WPF.
Getting Started
This example creates style for combobox button, combobox textbox separately and uses toghter in combobox style to make combobox round corner.
Example:- Style for combobox button
<Style x:Key="ComboBoxButtonStyle" TargetType="{x:Type ToggleButton}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<Border
Background="White"
x:Name="border"
CornerRadius="0,5,5,0"
BorderThickness="0,1,1,1"
BorderBrush="Black">
<ContentPresenter />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Example:- Style for combobox textbox
<Style x:Key="ComboBoxTextBoxStyle" TargetType="{x:Type TextBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBox}">
<Grid>
<Border CornerRadius="5,0,0,5"
BorderThickness="1,1,0,1"
Background="{TemplateBinding Background}"
BorderBrush="Black">
<ScrollViewer x:Name="PART_ContentHost"/>
</Border>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Example:- Style for combobox
<Style x:Key="ComboBoxStyle" TargetType="{x:Type ComboBox}">
<Setter Property="HorizontalContentAlignment" Value="Center"/>
<Setter Property="VerticalContentAlignment" Value="Center"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type ComboBox}">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition/>
<ColumnDefinition MaxWidth="18"/>
</Grid.ColumnDefinitions>
<TextBox Name="PART_EditableTextBox"
Style="{StaticResource ComboBoxTextBoxStyle}"
Padding="5,0,0,0"
Height="{TemplateBinding Height}"/>
<ToggleButton Grid.Column="1" Margin="0"
Height="{TemplateBinding Height}"
Style="{StaticResource ComboBoxButtonStyle}"
Focusable="False"
IsChecked="{Binding Path=IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
ClickMode="Press">
<Path Grid.Column="1"
HorizontalAlignment="Center"
VerticalAlignment="Center"
Data="M 0 0 L 4 4 L 8 0 Z"
Fill="DodgerBlue" />
</ToggleButton>
<ContentPresenter Name="ContentSite"
Content="{TemplateBinding SelectionBoxItem}"
ContentTemplate="{TemplateBinding SelectionBoxItemTemplate}"
ContentTemplateSelector="{TemplateBinding ItemTemplateSelector}"
VerticalAlignment="Center"
HorizontalAlignment="Left"
Margin="5,0,0,0"/>
<Popup Name="Popup"
Placement="Bottom"
IsOpen="{TemplateBinding IsDropDownOpen}"
AllowsTransparency="True"
Focusable="False"
PopupAnimation="Slide">
<Grid Name="DropDown"
SnapsToDevicePixels="True"
MinWidth="{TemplateBinding ActualWidth}"
MaxHeight="{TemplateBinding MaxDropDownHeight}">
<Border
x:Name="DropDownBorder"
BorderThickness="1"
CornerRadius="5"
BorderBrush="Black"/>
<ScrollViewer Margin="4,6,4,6" SnapsToDevicePixels="True">
<StackPanel IsItemsHost="True" KeyboardNavigation.DirectionalNavigation="Contained" />
</ScrollViewer>
</Grid>
</Popup>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
Example:- Use style in combobox
<ComboBox Width="100" HorizontalAlignment="Left" VerticalAlignment="Top" Margin="208,66,0,0" Height="25" Style="{StaticResource ComboBoxStyle}">
<ComboBoxItem>A</ComboBoxItem>
<ComboBoxItem>B</ComboBoxItem>
<ComboBoxItem>C</ComboBoxItem>
</ComboBox>
Summary
In this article demonstrated how to create round corner combobox in WPF, hope this article may helful to you
Thanks
Kailash Chandra Behera
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