Resizing the TimePicker in Universal Windows Platform - win-universal-app

Question

The TimePicker control in UWP doesn't re-size when properties like MaxWidth or Width are changed, is there another property I should set, or do I just have to find a work-around?

Answer 1

After some investigation, it seems you can only change the size of a TimePicker with the "Padding" property.

Answer 2

You need to change the default style of TimePicker. For example, please add the following style in your Page.Ressources. The only value I changed is MaxWidth to 800 - the default one is 456. You should then be able to maximize your control with Width property.
<Page.Resources>
<!-- Default style for Windows.UI.Xaml.Controls.TimePicker -->
<Style TargetType="TimePicker">
<Setter Property="IsTabStop" Value="False" />
<Setter Property="MinWidth" Value="242" />
<Setter Property="MaxWidth" Value="800" />
<Setter Property="FontFamily" Value="{ThemeResource ContentControlThemeFontFamily}" />
<Setter Property="FontSize" Value="{ThemeResource ControlContentThemeFontSize}" />
<Setter Property="Foreground" Value="{ThemeResource SystemControlForegroundBaseHighBrush}"/>
<Setter Property="HorizontalAlignment" Value="Left" />
<Setter Property="VerticalAlignment" Value="Center"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="TimePicker">
<StackPanel x:Name="LayoutRoot" Margin="{TemplateBinding Padding}">
<StackPanel.Resources>
<Style x:Key="TimePickerFlyoutButtonStyle" TargetType="Button">
<Setter Property="UseSystemFocusVisuals" Value="False" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="Button">
<Grid Background="{TemplateBinding Background}">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="PointerOver">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlPageBackgroundAltMediumBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseMediumLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlBackgroundBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="BorderBrush">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
<VisualStateGroup x:Name="FocusStates">
<VisualState x:Name="Focused">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Background">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightListAccentLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlHighlightAltBaseHighBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Unfocused" />
<VisualState x:Name="PointerFocused" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter x:Name="ContentPresenter"
BorderBrush="{ThemeResource SystemControlForegroundBaseMediumLowBrush}"
Background="{ThemeResource SystemControlBackgroundAltMediumLowBrush}"
BorderThickness="2"
Content="{TemplateBinding Content}"
Foreground="{TemplateBinding Foreground}"
HorizontalContentAlignment="Stretch"
VerticalContentAlignment="Stretch"
AutomationProperties.AccessibilityView="Raw"/>
</Grid>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</StackPanel.Resources>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Disabled">
<Storyboard>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="HeaderContentPresenter"
Storyboard.TargetProperty="Foreground">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="FirstColumnDivider"
Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
<ObjectAnimationUsingKeyFrames Storyboard.TargetName="SecondColumnDivider"
Storyboard.TargetProperty="Fill">
<DiscreteObjectKeyFrame KeyTime="0" Value="{ThemeResource SystemControlDisabledBaseLowBrush}" />
</ObjectAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<ContentPresenter x:Name="HeaderContentPresenter"
x:DeferLoadStrategy="Lazy"
Visibility="Collapsed"
Content="{TemplateBinding Header}"
ContentTemplate="{TemplateBinding HeaderTemplate}"
Margin="0,0,0,8"
Foreground="{ThemeResource SystemControlForegroundBaseHighBrush}"
AutomationProperties.AccessibilityView="Raw" />
<Button x:Name="FlyoutButton"
Style="{StaticResource TimePickerFlyoutButtonStyle}"
Foreground="{TemplateBinding Foreground}"
Background="{TemplateBinding Background}"
IsEnabled="{TemplateBinding IsEnabled}"
HorizontalAlignment="Stretch"
HorizontalContentAlignment="Stretch">
<Grid x:Name="FlyoutButtonContentGrid">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" x:Name="FirstTextBlockColumn" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" x:Name="SecondTextBlockColumn" />
<ColumnDefinition Width="Auto" />
<ColumnDefinition Width="*" x:Name="ThirdTextBlockColumn" />
</Grid.ColumnDefinitions>
<Border x:Name="FirstPickerHost" Grid.Column="0">
<TextBlock x:Name="HourTextBlock" TextAlignment="Center" Padding="0,3,0,5" FontFamily="{TemplateBinding FontFamily}" FontWeight="{TemplateBinding FontWeight}" FontSize="{TemplateBinding FontSize}" AutomationProperties.AccessibilityView="Raw"/>
</Border>
<Rectangle x:Name="FirstColumnDivider" Fill="{ThemeResource SystemControlForegroundBaseLowBrush}" HorizontalAlignment="Center" Width="2" Grid.Column="1" />
<Border x:Name="SecondPickerHost" Grid.Column="2">
<TextBlock x:Name="MinuteTextBlock" TextAlignment="Center" Padding="0,3,0,5" FontFamily="{TemplateBinding FontFamily}" FontWeight="{TemplateBinding FontWeight}" FontSize="{TemplateBinding FontSize}" AutomationProperties.AccessibilityView="Raw"/>
</Border>
<Rectangle x:Name="SecondColumnDivider" Fill="{ThemeResource SystemControlForegroundBaseLowBrush}" HorizontalAlignment="Center" Width="2" Grid.Column="3" />
<Border x:Name="ThirdPickerHost" Grid.Column="4">
<TextBlock x:Name="PeriodTextBlock" TextAlignment="Center" Padding="0,3,0,5" FontFamily="{TemplateBinding FontFamily}" FontWeight="{TemplateBinding FontWeight}" FontSize="{TemplateBinding FontSize}" AutomationProperties.AccessibilityView="Raw"/>
</Border>
</Grid>
</Button>
</StackPanel>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Page.Resources>

Answer 3

I found a very easy workaround for resizing the Timepicker or DatePicker. I just put a ViewBox around it and assign the width and height I want to the Viewbox. the Viewbox does all the sizing for the picker control for you. SImple. Done.

Answer 4

There is different workarounds depending the target SDK of the project.
When the project targets to Windows 10 1709 10.0.16299.0 setting the MinWidth property of the TimePicker is enough to reduce its width.
When the project targets to Windows 10 1803 10.0.17763.0 replacing the default TimePickerThemeMinWidth value in the App.xaml file does the trick:
<ResourceDictionary.ThemeDictionaries>
<ResourceDictionary x:Key="Default">
<x:Double x:Key="TimePickerThemeMinWidth">140</x:Double>
</ResourceDictionary>
<ResourceDictionary x:Key="Dark">
<x:Double x:Key="TimePickerThemeMinWidth">140</x:Double>
</ResourceDictionary>
<ResourceDictionary x:Key="Light">
<x:Double x:Key="TimePickerThemeMinWidth">140</x:Double>
</ResourceDictionary>
</ResourceDictionary.ThemeDictionaries>