Universal Windows Platform – Custom ComboBox

Step 1

If not already, follow Setup and Start on how to Install and get Started with Visual Studio 2017 or in Windows 10 choose Start, and then from the Start Menu locate and select Visual Studio 2017.

vs2017-home

Step 2

Once Visual Studio Community 2017 has started, from the Menu choose File, then New then Project…

vs2017-file-new-project

Step 3

From New Project choose Visual C# from Installed, Templates then choose Blank App (Universal Windows) and then type in a Name and select a Location and then select Ok to create the Project

vs2017-new-project

Step 4

Then in New Universal Windows Project you need to select the Target Version to be Windows 10 Creators Update (10.0; Build 15063) and the Minimum Version to be at least Windows 10 Anniversary Update (10.0; Build 14393) or Windows 10 Creators Update (10.0; Build 15063)

vs2017-platform

Step 5

In the Solution Explorer select App.xaml

vs2017-app

Step 6

From the Menu choose View and then Designer

vs2017-view-designer

Step 7

The XAML View and in this between the Application and /Application elements, enter the following XAML:

<Application.Resources>
	<Style x:Key="CustomComboBox" TargetType="ComboBox">
		<Setter Property="Padding" Value="12,5,0,7"/>
		<Setter Property="MinWidth" Value="{ThemeResource ComboBoxThemeMinWidth}"/>
		<Setter Property="Foreground" Value="Gold"/>
		<Setter Property="Background" Value="{ThemeResource ComboBoxBackground}"/>
		<Setter Property="BorderBrush" Value="{ThemeResource ComboBoxBorderBrush}"/>
		<Setter Property="BorderThickness" Value="{ThemeResource ComboBoxBorderThemeThickness}"/>
		<Setter Property="TabNavigation" Value="Once"/>
		<Setter Property="ScrollViewer.HorizontalScrollBarVisibility" Value="Disabled"/>
		<Setter Property="ScrollViewer.VerticalScrollBarVisibility" Value="Auto"/>
		<Setter Property="ScrollViewer.HorizontalScrollMode" Value="Disabled"/>
		<Setter Property="ScrollViewer.VerticalScrollMode" Value="Auto"/>
		<Setter Property="ScrollViewer.IsVerticalRailEnabled" Value="True"/>
		<Setter Property="ScrollViewer.IsDeferredScrollingEnabled" Value="False"/>
		<Setter Property="ScrollViewer.BringIntoViewOnFocusChange" Value="True"/>
		<Setter Property="HorizontalContentAlignment" Value="Stretch"/>
		<Setter Property="HorizontalAlignment" Value="Left"/>
		<Setter Property="VerticalAlignment" Value="Top"/>
		<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}"/>
		<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}"/>
		<Setter Property="ItemsPanel">
			<Setter.Value>
				<ItemsPanelTemplate>
					<CarouselPanel/>
				</ItemsPanelTemplate>
			</Setter.Value>
		</Setter>
		<Setter Property="Template">
			<Setter.Value>
				<ControlTemplate TargetType="ComboBox">
					<Grid x:Name="LayoutRoot">
						<Grid.Resources>
							<Storyboard x:Key="OverlayOpeningAnimation">
								<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
									<DiscreteDoubleKeyFrame KeyTime="0:0:0" Value="0.0"/>
									<SplineDoubleKeyFrame KeySpline="0.1,0.9 0.2,1.0" KeyTime="0:0:0.383" Value="1.0"/>
								</DoubleAnimationUsingKeyFrames>
							</Storyboard>
							<Storyboard x:Key="OverlayClosingAnimation">
								<DoubleAnimationUsingKeyFrames Storyboard.TargetProperty="Opacity">
									<DiscreteDoubleKeyFrame KeyTime="0:0:0" Value="1.0"/>
									<SplineDoubleKeyFrame KeySpline="0.1,0.9 0.2,1.0" KeyTime="0:0:0.216" Value="0.0"/>
								</DoubleAnimationUsingKeyFrames>
							</Storyboard>
						</Grid.Resources>
						<Grid.ColumnDefinitions>
							<ColumnDefinition Width="*"/>
							<ColumnDefinition Width="32"/>
						</Grid.ColumnDefinitions>
						<Grid.RowDefinitions>
							<RowDefinition Height="Auto"/>
							<RowDefinition Height="*"/>
						</Grid.RowDefinitions>
						<VisualStateManager.VisualStateGroups>
							<VisualStateGroup x:Name="CommonStates">
								<VisualState x:Name="Normal"/>
								<VisualState x:Name="PointerOver">
									<Storyboard>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundPointerOver}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="GoldenRod"/>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
								<VisualState x:Name="Pressed">
									<Storyboard>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundPressed}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBorderBrushPressed}"/>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
								<VisualState x:Name="Disabled">
									<Storyboard>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Background" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="Background">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBorderBrushDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="HeaderContentPresenter">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="PlaceholderTextBlock">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DropDownGlyph">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundDisabled}"/>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
							</VisualStateGroup>
							<VisualStateGroup x:Name="FocusStates">
								<VisualState x:Name="Focused">
									<Storyboard>
										<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="HighlightBackground"/>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="BorderBrush" Storyboard.TargetName="HighlightBackground">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxBackgroundBorderBrushFocused}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundFocused}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="PlaceholderTextBlock">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundFocused}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DropDownGlyph">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundFocused}"/>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
								<VisualState x:Name="FocusedPressed">
									<Storyboard>
										<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="HighlightBackground"/>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="ContentPresenter">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxForegroundFocusedPressed}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="PlaceholderTextBlock">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxPlaceHolderForegroundFocusedPressed}"/>
										</ObjectAnimationUsingKeyFrames>
										<ObjectAnimationUsingKeyFrames Storyboard.TargetProperty="Foreground" Storyboard.TargetName="DropDownGlyph">
											<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource ComboBoxDropDownGlyphForegroundFocusedPressed}"/>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
								<VisualState x:Name="Unfocused"/>
								<VisualState x:Name="PointerFocused"/>
								<VisualState x:Name="FocusedDropDown">
									<Storyboard>
										<ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetProperty="Visibility" Storyboard.TargetName="PopupBorder">
											<DiscreteObjectKeyFrame KeyTime="0">
												<DiscreteObjectKeyFrame.Value>
													<Visibility>Visible</Visibility>
												</DiscreteObjectKeyFrame.Value>
											</DiscreteObjectKeyFrame>
										</ObjectAnimationUsingKeyFrames>
									</Storyboard>
								</VisualState>
							</VisualStateGroup>
							<VisualStateGroup x:Name="DropDownStates">
								<VisualState x:Name="Opened">
									<Storyboard>
										<SplitOpenThemeAnimation ClosedTargetName="ContentPresenter" 
										OffsetFromCenter="{Binding TemplateSettings.DropDownOffset, RelativeSource={RelativeSource Mode=TemplatedParent}}" 
										OpenedTargetName="PopupBorder" OpenedLength="{Binding TemplateSettings.DropDownOpenedHeight, RelativeSource={RelativeSource Mode=TemplatedParent}}"/>
									</Storyboard>
								</VisualState>
								<VisualState x:Name="Closed">
									<Storyboard>
										<SplitCloseThemeAnimation ClosedTargetName="ContentPresenter" 
										OffsetFromCenter="{Binding TemplateSettings.DropDownOffset, RelativeSource={RelativeSource Mode=TemplatedParent}}" 
										OpenedTargetName="PopupBorder" OpenedLength="{Binding TemplateSettings.DropDownOpenedHeight, RelativeSource={RelativeSource Mode=TemplatedParent}}"/>
									</Storyboard>
								</VisualState>
							</VisualStateGroup>
						</VisualStateManager.VisualStateGroups>
						<Border x:Name="Background" BorderBrush="Salmon" BorderThickness="{TemplateBinding BorderThickness}" 
						Background="LightSalmon" Grid.ColumnSpan="2" Grid.Row="1" CornerRadius="15"/>
						<Border x:Name="HighlightBackground" BorderBrush="Gold" BorderThickness="{TemplateBinding BorderThickness}" 
						Background="{ThemeResource ComboBoxBackgroundUnfocused}" Grid.ColumnSpan="2" Opacity="0" Grid.Row="1" CornerRadius="15"/>
						<ContentPresenter x:Name="ContentPresenter" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" 
						Margin="{TemplateBinding Padding}" Grid.Row="1" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" CornerRadius="15">
							<TextBlock x:Name="PlaceholderTextBlock" Foreground="{ThemeResource ComboBoxPlaceHolderForeground}" 
							Text="{TemplateBinding PlaceholderText}"/>
						</ContentPresenter>
						<FontIcon x:Name="DropDownGlyph" AutomationProperties.AccessibilityView="Raw" Grid.Column="1" Foreground="Gold" 
						FontSize="12" FontFamily="{ThemeResource SymbolThemeFontFamily}" Glyph="" HorizontalAlignment="Right" 
						IsHitTestVisible="False" Margin="0,10,10,10" Grid.Row="1" VerticalAlignment="Center"/>
						<Popup x:Name="Popup">
							<Border x:Name="PopupBorder" BorderBrush="Salmon" 
							BorderThickness="{ThemeResource ComboBoxDropdownBorderThickness}" 
							Background="LightSalmon" HorizontalAlignment="Stretch" 
							Margin="0,-1,0,-1" CornerRadius="15">
								<ScrollViewer x:Name="ScrollViewer" AutomationProperties.AccessibilityView="Raw" 
								BringIntoViewOnFocusChange="{TemplateBinding ScrollViewer.BringIntoViewOnFocusChange}" 
								Foreground="{ThemeResource ComboBoxDropDownForeground}" 
								HorizontalScrollMode="{TemplateBinding ScrollViewer.HorizontalScrollMode}" 
								HorizontalScrollBarVisibility="{TemplateBinding ScrollViewer.HorizontalScrollBarVisibility}" 
								IsHorizontalRailEnabled="{TemplateBinding ScrollViewer.IsHorizontalRailEnabled}" 
								IsVerticalRailEnabled="{TemplateBinding ScrollViewer.IsVerticalRailEnabled}" 
								IsDeferredScrollingEnabled="{TemplateBinding ScrollViewer.IsDeferredScrollingEnabled}" 
								MinWidth="{Binding TemplateSettings.DropDownContentMinWidth, RelativeSource={RelativeSource Mode=TemplatedParent}}" 
								VerticalSnapPointsType="OptionalSingle" VerticalScrollBarVisibility="{TemplateBinding ScrollViewer.VerticalScrollBarVisibility}" 
								VerticalScrollMode="{TemplateBinding ScrollViewer.VerticalScrollMode}" VerticalSnapPointsAlignment="Near" ZoomMode="Disabled">
									<ItemsPresenter Margin="{ThemeResource ComboBoxDropdownContentMargin}"/>
								</ScrollViewer>
							</Border>
						</Popup>
					</Grid>
				</ControlTemplate>
			</Setter.Value>
		</Setter>
	</Style>
</Application.Resources>

Step 8

From the Solution Explorer select MainPage.xaml

vs2017-mainpage

Step 9

From the Menu choose View and then Designer

vs2017-view-designer

Step 10

The Design View will be displayed along with the XAML View and in this between the Grid and /Grid elements, enter the following XAML:

<ComboBox SelectedIndex="0" HorizontalAlignment="Center" VerticalAlignment="Center" Style="{StaticResource CustomComboBox}">
	<ComboBoxItem Content="ComboBox"/>
	<ComboBoxItem Content="One"/>
	<ComboBoxItem Content="Two"/>
	<ComboBoxItem Content="Three"/>
	<ComboBoxItem Content="Four"/>
</ComboBox>

It should appear as such:

xaml-custom-combobox

Step 11

That completes the Universal Windows Application so Save the Project then in Visual Studio select the Local Machine to run the Application

vs2017-debug

Step 12

Once started the Application should then appear

run-custom-combobox

Step 13

After the Application has started running you can then select ComboBox if not already and then select one of the items from the ComboBox

ran-custom-combobox

Step 14

To Exit the application select Stop in Visual Studio

vs2017-stop

Creative Commons License

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