居中 DatePicker 控件
Posted
技术标签:
【中文标题】居中 DatePicker 控件【英文标题】：Centering DatePicker control 【发布时间】：2010-12-04 13:51:12 【问题描述】：我正在使用 wpf 工具包中的日期选择器控件。我需要在 datepicker 控件中居中对齐内容。我怎样才能做到这一点？
试过 VerticalContentAlignment="Center"。没用。
【问题讨论】：
【参考方案1】：<Style TargetType="DatePickerTextBox">
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="Padding" Value="2" />
</Style>
【讨论】：
适用于 .Net 4 的DatePicker。【参考方案2】：
其他解决方案都不起作用，因为 DatePicker 内容（文本和按钮）的垂直对齐方式在默认 WPF 样式中是硬编码的。即默认的 WPF DatePicker 样式没有以可以覆盖垂直对齐（以及许多其他属性）的方式编写。
这应该可以解决它（垂直对齐已被模板限制） - 提取默认的 DatePicker 样式 - 修复样式以使用适当的模板绑定 - 应用新样式
<Style TargetType="DatePicker" BasedOn="StaticResource DatePickerStyle.Centred">
<Setter Property="FontSize" Value="16" />
<Setter Property="Height" Value="128" />
<Setter Property="VerticalAlignment" Value="Center" />
<Setter Property="VerticalContentAlignment" Value="Center" />
</Style>
BetterDatePicker.xaml
<Style x:Key="DatePickerStyle.Centred" TargetType="x:Type DatePicker">
<Setter Property="Foreground" Value="#FF333333" />
<Setter Property="IsTodayHighlighted" Value="True" />
<Setter Property="SelectedDateFormat" Value="Short" />
<Setter Property="Background" Value="Transparent" />
<Setter Property="Padding" Value="2" />
<Setter Property="BorderBrush">
<Setter.Value>
<LinearGradientBrush EndPoint=".5,0" StartPoint=".5,1">
<GradientStop Color="#FFA3AEB9" Offset="0" />
<GradientStop Color="#FF8399A9" Offset="0.375" />
<GradientStop Color="#FF718597" Offset="0.375" />
<GradientStop Color="#FF617584" Offset="1" />
</LinearGradientBrush>
</Setter.Value>
</Setter>
<Setter Property="BorderThickness" Value="1" />
<Setter Property="HorizontalContentAlignment" Value="Stretch" />
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="x:Type DatePicker">
<Border BorderBrush="TemplateBinding BorderBrush" BorderThickness="TemplateBinding BorderThickness" Background="TemplateBinding Background"
Padding="TemplateBinding Padding">
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualState x:Name="Normal" />
<VisualState x:Name="Disabled">
<Storyboard>
<DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_DisabledVisual" />
</Storyboard>
</VisualState>
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid x:Name="PART_Root" HorizontalAlignment="TemplateBinding HorizontalContentAlignment" VerticalAlignment="TemplateBinding VerticalContentAlignment">
<Grid.Resources>
<SolidColorBrush x:Key="DisabledBrush" Color="#A5FFFFFF" />
<ControlTemplate x:Key="DropDownButtonTemplate" TargetType="x:Type Button">
<Grid>
<VisualStateManager.VisualStateGroups>
<VisualStateGroup x:Name="CommonStates">
<VisualStateGroup.Transitions>
<VisualTransition GeneratedDuration="0" />
<VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver" />
<VisualTransition GeneratedDuration="0:0:0.1" To="Pressed" />
</VisualStateGroup.Transitions>
<VisualState x:Name="Normal" />
<VisualState x:Name="MouseOver">
<Storyboard>
<ColorAnimation Duration="0" To="#FF448DCA" Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)"
Storyboard.TargetName="Background" />
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#7FFFFFFF" />
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#CCFFFFFF" />
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#F2FFFFFF" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Pressed">
<Storyboard>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(SolidColorBrush.Color)"
Storyboard.TargetName="Background">
<SplineColorKeyFrame KeyTime="0" Value="#FF448DCA" />
</ColorAnimationUsingKeyFrames>
<DoubleAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001" Storyboard.TargetProperty="(UIElement.Opacity)"
Storyboard.TargetName="Highlight">
<SplineDoubleKeyFrame KeyTime="0" Value="1" />
</DoubleAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[1].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#EAFFFFFF" />
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[2].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#C6FFFFFF" />
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[3].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#6BFFFFFF" />
</ColorAnimationUsingKeyFrames>
<ColorAnimationUsingKeyFrames BeginTime="0" Duration="00:00:00.001"
Storyboard.TargetProperty="(Border.Background).(GradientBrush.GradientStops)[0].(GradientStop.Color)"
Storyboard.TargetName="BackgroundGradient">
<SplineColorKeyFrame KeyTime="0" Value="#F4FFFFFF" />
</ColorAnimationUsingKeyFrames>
</Storyboard>
</VisualState>
<VisualState x:Name="Disabled" />
</VisualStateGroup>
</VisualStateManager.VisualStateGroups>
<Grid Background="#11FFFFFF" FlowDirection="LeftToRight" HorizontalAlignment="Center" Height="18" Margin="0" VerticalAlignment="Center"
Width="19">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
<ColumnDefinition Width="20*" />
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="23*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
<RowDefinition Height="19*" />
</Grid.RowDefinitions>
<Border x:Name="Highlight" BorderBrush="#FF45D6FA" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius="0,0,1,1" Margin="-1"
Opacity="0" Grid.Row="0" Grid.RowSpan="4" />
<Border x:Name="Background" BorderBrush="#FFFFFFFF" BorderThickness="1" Background="#FF1F3B53" Grid.ColumnSpan="4" CornerRadius=".5"
Margin="0,-1,0,0" Opacity="1" Grid.Row="1" Grid.RowSpan="3" />
<Border x:Name="BackgroundGradient" BorderBrush="#BF000000" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius=".5" Margin="0,-1,0,0"
Opacity="1" Grid.Row="1" Grid.RowSpan="3">
<Border.Background>
<LinearGradientBrush EndPoint=".7,1" StartPoint=".7,0">
<GradientStop Color="#FFFFFFFF" Offset="0" />
<GradientStop Color="#F9FFFFFF" Offset="0.375" />
<GradientStop Color="#E5FFFFFF" Offset="0.625" />
<GradientStop Color="#C6FFFFFF" Offset="1" />
</LinearGradientBrush>
</Border.Background>
</Border>
<Rectangle Grid.ColumnSpan="4" Grid.RowSpan="1" StrokeThickness="1">
<Rectangle.Fill>
<LinearGradientBrush EndPoint="0.3,-1.1" StartPoint="0.46,1.6">
<GradientStop Color="#FF4084BD" />
<GradientStop Color="#FFAFCFEA" Offset="1" />
</LinearGradientBrush>
</Rectangle.Fill>
<Rectangle.Stroke>
<LinearGradientBrush EndPoint="0.48,-1" StartPoint="0.48,1.25">
<GradientStop Color="#FF494949" />
<GradientStop Color="#FF9F9F9F" Offset="1" />
</LinearGradientBrush>
</Rectangle.Stroke>
</Rectangle>
<Path Grid.ColumnSpan="4" Grid.Column="0"
Data="M11.426758,8.4305077 L11.749023,8.4305077 L11.749023,16.331387 L10.674805,16.331387 L10.674805,10.299648 L9.0742188,11.298672 L9.0742188,10.294277 C9.4788408,10.090176 9.9094238,9.8090878 10.365967,9.4510155 C10.82251,9.0929432 11.176106,8.7527733 11.426758,8.4305077 z M14.65086,8.4305077 L18.566387,8.4305077 L18.566387,9.3435936 L15.671368,9.3435936 L15.671368,11.255703 C15.936341,11.058764 16.27293,10.960293 16.681133,10.960293 C17.411602,10.960293 17.969301,11.178717 18.354229,11.615566 C18.739157,12.052416 18.931622,12.673672 18.931622,13.479336 C18.931622,15.452317 18.052553,16.438808 16.294415,16.438808 C15.560365,16.438808 14.951641,16.234707 14.468243,15.826504 L14.881817,14.929531 C15.368796,15.326992 15.837872,15.525723 16.289043,15.525723 C17.298809,15.525723 17.803692,14.895514 17.803692,13.635098 C17.803692,12.460618 17.305971,11.873379 16.310528,11.873379 C15.83071,11.873379 15.399232,12.079271 15.016094,12.491055 L14.65086,12.238613 z"
Fill="#FF2F2F2F" HorizontalAlignment="Center" Margin="4,3,4,3" Grid.Row="1" Grid.RowSpan="3" RenderTransformOrigin="0.5,0.5"
Stretch="Fill" VerticalAlignment="Center" />
<Ellipse Grid.ColumnSpan="4" Fill="#FFFFFFFF" HorizontalAlignment="Center" Height="3" StrokeThickness="0" VerticalAlignment="Center"
Width="3" />
<Border x:Name="DisabledVisual" BorderBrush="#B2FFFFFF" BorderThickness="1" Grid.ColumnSpan="4" CornerRadius="0,0,.5,.5" Opacity="0"
Grid.Row="0" Grid.RowSpan="4" />
</Grid>
</Grid>
</ControlTemplate>
</Grid.Resources>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Button x:Name="PART_Button" Grid.Column="1" Foreground="TemplateBinding Foreground" Focusable="False" HorizontalAlignment="Left" Margin="3,0,3,0"
Grid.Row="0" Template="StaticResource DropDownButtonTemplate" VerticalAlignment="TemplateBinding VerticalAlignment" Width="20" Height="20" MinWidth="20" MinHeight="20" />
<DatePickerTextBox x:Name="PART_TextBox" Grid.Column="0" Foreground="TemplateBinding Foreground" Focusable="TemplateBinding Focusable"
HorizontalContentAlignment="Stretch" Grid.Row="0" VerticalContentAlignment="TemplateBinding VerticalContentAlignment" />
<Grid x:Name="PART_DisabledVisual" Grid.ColumnSpan="2" Grid.Column="0" IsHitTestVisible="False" Opacity="0" Grid.Row="0">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<Rectangle Grid.Column="0" Fill="#A5FFFFFF" RadiusY="1" Grid.Row="0" RadiusX="1" />
<Rectangle Grid.Column="1" Fill="#A5FFFFFF" Height="18" Margin="3,0,3,0" RadiusY="1" Grid.Row="0" RadiusX="1" Width="19" />
<Popup x:Name="PART_Popup" AllowsTransparency="True" Placement="Bottom" PlacementTarget="Binding ElementName=PART_TextBox" StaysOpen="False" />
</Grid>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
【讨论】：
【参考方案3】：为 DatePicker 创建 ControlTemplate 并将 PART_TextBox 元素的“VerticalContentAlignment”属性设置为“Center”。
【讨论】：
【参考方案4】：在父控件的资源中包含这段代码：
<Style TargetType="x:Type DatePickerTextBox">
<Setter Property="VerticalContentAlignment" Value="Center" />
</Style>
【讨论】：
【参考方案5】：我在正确对齐 DatePicker 右侧的按钮时遇到了一点问题，但这有效：
<my:DatePicker>
<my:DatePicker.Resources>
<Style TargetType="Button">
<Setter Property="VerticalAlignment" Value="Top"/>
</Style>
</my:DatePicker.Resources>
</my:DatePicker>
【讨论】：
以上是关于居中 DatePicker 控件的主要内容，如果未能解决你的问题，请参考以下文章