一．前言
申明：WPF自定义控件与样式是一个系列文章，前后是有些关联的，但大多是按照由简到繁的顺序逐步发布的等，若有不明白的地方可以参考本系列前面的文章，文末附有部分文章链接。
本文主要内容：
- 日历控件Calendar自定义样式；
- 日期控件DatePicker自定义样式，及Label标签、水印、清除日期功能扩展；
二．Calendar自定义样式
先看看效果：
从上面图可以看出，日历的显示其实有三种状态，如下面的分解图：
- "日"部分的显示；
- "月"部分的显示；
- "年"部分的显示；
因此一个完整的日历，就包含多个部分，首先是"日"按钮的样式：
<!--Day按钮样式--> <Style x:Key="CalendarDayButtonStyle" TargetType="{x:Type CalendarDayButton}"> <Setter Property="MinWidth" Value="28" /> <Setter Property="MinHeight" Value="5" /> <Setter Property="FontFamily" Value="{StaticResource FontFamily}" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="Background" Value="Transparent" /> <Setter Property="Foreground" Value="{StaticResource TextForeground}" /> <Setter Property="Margin" Value="0" /> <Setter Property="IsTabStop" Value="False" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type CalendarDayButton}"> <Grid x:Name="Grid" Margin="{TemplateBinding Margin}"> <Border x:Name="Bg" Background="{TemplateBinding Background}" /> <ContentPresenter x:Name="NormalText" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="5,2,5,2" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" TextElement.Foreground="{TemplateBinding Foreground}" /> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsSelected" Value="True"> <Setter Property="Background" Value="{StaticResource ItemSelectedBackground}"></Setter> <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}"></Setter> </Trigger> <Trigger Property="IsToday" Value="True"> <Setter Property="Background" Value="{StaticResource ItemHighlighteBackground}"></Setter> <Setter Property="Foreground" Value="{StaticResource ItemHighlighteForeground}"></Setter> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Background" Value="{StaticResource ItemMouseOverBackground}"></Setter> <Setter Property="Foreground" Value="{StaticResource ItemMouseOverForeground}"></Setter> </Trigger> <!--不可用日期--> <Trigger Property="IsBlackedOut" Value="True"> <Setter Property="Opacity" Value="{StaticResource DisableOpacity}" TargetName="Grid"></Setter> </Trigger> <!--不在当月的日期--> <Trigger Property="IsInactive" Value="True"> <Setter Property="Opacity" Value="0.65" TargetName="Grid"></Setter> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Opacity" Value="{StaticResource DisableOpacity}" TargetName="Grid"></Setter> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
日历日期面板样式：
<!--日历日期面板样式--> <Style x:Key="CalendarItemStyle" TargetType="{x:Type CalendarItem}"> <Setter Property="Margin" Value="0,1,0,1" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type CalendarItem}"> <ControlTemplate.Resources> <!-- 头部星期样式--> <DataTemplate x:Key="{x:Static CalendarItem.DayTitleTemplateResourceKey}"> <TextBlock Text="{Binding}" FontWeight="Bold" FontFamily="{StaticResource FontFamily}" Foreground="{StaticResource PressedForeground}" FontSize="{StaticResource HeaderFontSize}" HorizontalAlignment="Center" VerticalAlignment="Center" Margin="0,6,0,6" Opacity="0.8" /> </DataTemplate> </ControlTemplate.Resources> <Grid x:Name="PART_Root"> <Border BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="1" Background="{TemplateBinding Background}" Margin="{TemplateBinding Margin}"> <Grid Margin="2"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="Auto" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> <!--Header--> <Grid Grid.Row="0" HorizontalAlignment="Stretch" Background="{StaticResource HeaderBackground}"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*"/> <ColumnDefinition Width="2*"/> <ColumnDefinition Width="*"/> </Grid.ColumnDefinitions> <local:FButton x:Name="PART_HeaderButton" FontWeight="Bold" Style="{StaticResource FButton_Transparency}" Focusable="False" Grid.Column="1" FIcon="{x:Null}"/> <local:FButton x:Name="PART_PreviousButton" Style="{StaticResource FButton_Transparency}" Focusable="False" Grid.Column="0" FIconSize="18" Content="" FIcon=""/> <local:FButton x:Name="PART_NextButton" Style="{StaticResource FButton_Transparency}" Focusable="False" Grid.Column="2" FIconSize="18" Content="" FIcon=""/> </Grid> <!--PART_MonthView--> <Grid x:Name="PART_MonthView" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="6,1,6,6" Grid.Row="1" Visibility="Visible"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> </Grid> <!--PART_YearView--> <Grid x:Name="PART_YearView" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="6,10,6,10" Grid.Row="1" Visibility="Hidden"> <Grid.ColumnDefinitions> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="*" /> </Grid.ColumnDefinitions> <Grid.RowDefinitions> <RowDefinition Height="*" /> <RowDefinition Height="*" /> <RowDefinition Height="*" /> </Grid.RowDefinitions> </Grid> </Grid> </Border> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Opacity" TargetName="PART_Root" Value="{StaticResource DisableOpacity}" /> </Trigger> <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}" Value="Year"> <Setter Property="Visibility" TargetName="PART_MonthView" Value="Hidden" /> <Setter Property="Visibility" TargetName="PART_YearView" Value="Visible" /> </DataTrigger> <!--Decade 美 ['dɛked] n. 十年，十年期；十--> <DataTrigger Binding="{Binding DisplayMode, RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type Calendar}}}" Value="Decade"> <Setter Property="Visibility" TargetName="PART_MonthView" Value="Hidden" /> <Setter Property="Visibility" TargetName="PART_YearView" Value="Visible" /> </DataTrigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
年月按钮样式：
<!--年、月按钮样式--> <Style x:Key="CalendarButtonStyle" TargetType="{x:Type CalendarButton}"> <Setter Property="Background" Value="Transparent" /> <Setter Property="MinWidth" Value="40" /> <Setter Property="MinHeight" Value="42" /> <Setter Property="FontSize" Value="{StaticResource FontSize}" /> <Setter Property="FontFamily" Value="{StaticResource FontFamily}" /> <Setter Property="HorizontalContentAlignment" Value="Center" /> <Setter Property="VerticalContentAlignment" Value="Center" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type CalendarButton}"> <Grid x:Name="Grid" Margin="{TemplateBinding Margin}"> <Border x:Name="Bg" Background="{TemplateBinding Background}" /> <ContentPresenter x:Name="NormalText" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="5,2,5,2" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" TextElement.Foreground="{TemplateBinding Foreground}" /> </Grid> <ControlTemplate.Triggers> <Trigger Property="IsFocused" Value="True"> <Setter Property="Background" Value="{StaticResource ItemSelectedBackground}"></Setter> <Setter Property="Foreground" Value="{StaticResource ItemSelectedForeground}"></Setter> </Trigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="Background" Value="{StaticResource ItemMouseOverBackground}"></Setter> <Setter Property="Foreground" Value="{StaticResource ItemMouseOverForeground}"></Setter> </Trigger> <!--不在当月的日期--> <Trigger Property="IsInactive" Value="True"> <Setter Property="Opacity" Value="0.8" TargetName="Grid"></Setter> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter Property="Opacity" Value="{StaticResource DisableOpacity}" TargetName="Grid"></Setter> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
最后综合以上的样式，定义我们需要的Calendar样式就差一步之遥了。
<!--默认日历样式--> <Style x:Key="DefaultCalendar" TargetType="{x:Type Calendar}"> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="Foreground" Value="{StaticResource TextForeground}" /> <Setter Property="CalendarDayButtonStyle" Value="{StaticResource CalendarDayButtonStyle}" /> <Setter Property="CalendarItemStyle" Value="{StaticResource CalendarItemStyle}" /> <Setter Property="CalendarButtonStyle" Value="{StaticResource CalendarButtonStyle}" /> <Setter Property="Background" Value="{StaticResource PopupBackground}" /> <Setter Property="BorderBrush" Value="{StaticResource ControlBorderBrush}" /> <Setter Property="BorderThickness" Value="1" /> <Setter Property="FontSize" Value="13" /> <Setter Property="FontFamily" Value="{StaticResource FontFamily}" /> <Setter Property="IsTodayHighlighted" Value="True" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type Calendar}"> <StackPanel x:Name="PART_Root" HorizontalAlignment="Center" Background="Transparent"> <CalendarItem x:Name="PART_CalendarItem" BorderBrush="{TemplateBinding BorderBrush}" FontSize="{TemplateBinding FontSize}" FontFamily="{TemplateBinding FontFamily}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" Style="{TemplateBinding CalendarItemStyle}" /> </StackPanel> </ControlTemplate> </Setter.Value> </Setter> </Style>
三．DatePicker自定义样式，及Label标签、水印、清除日期功能扩展
有了上面的日历样式，下面做DatePicker的样式就好办了，其实就是TextBox+Button+Calendar。此处的实现同上一篇（WPF自定义控件与样式(3)-TextBox & RichTextBox & PasswordBox样式）思路基本一致，因此本文就不做更多的解释，可以参考本系列前面的文章（末尾附录有链接）先看看效果图：
3.1 DatePicker自定义样式
基本样式定义：
<Style x:Key="DefaultDatePicker" TargetType="{x:Type DatePicker}"> <Setter Property="Foreground" Value="{StaticResource TextForeground}" /> <Setter Property="Background" Value="{StaticResource TextBackground}" /> <Setter Property="BorderThickness" Value="1" /> <Setter Property="BorderBrush" Value="{StaticResource ControlBorderBrush}" /> <Setter Property="local:ControlAttachProperty.FocusBorderBrush" Value="{StaticResource FocusBorderBrush}" /> <Setter Property="local:ControlAttachProperty.MouseOverBorderBrush" Value="{StaticResource MouseOverBorderBrush}" /> <Setter Property="local:ControlAttachProperty.FIconSize" Value="21" /> <Setter Property="FontFamily" Value="{StaticResource FontFamily}" /> <Setter Property="FontSize" Value="{StaticResource FontSize}" /> <Setter Property="MinHeight" Value="26" /> <Setter Property="Height" Value="30" /> <Setter Property="Width" Value="200" /> <Setter Property="HorizontalContentAlignment" Value="Stretch" /> <Setter Property="IsTodayHighlighted" Value="True" /> <Setter Property="Padding" Value="0" /> <Setter Property="Margin" Value="0" /> <Setter Property="SelectedDate" Value="{x:Null}" /> <Setter Property="SnapsToDevicePixels" Value="True" /> <Setter Property="CalendarStyle" Value="{StaticResource DefaultCalendar}" /> <Setter Property="Template"> <Setter.Value> <ControlTemplate TargetType="{x:Type DatePicker}"> <Grid x:Name="PART_Root"> <Border x:Name="Bg" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" /> <Grid x:Name="PART_InnerGrid" Margin="0"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="*" /> <ColumnDefinition Width="Auto" /> <ColumnDefinition Width="Auto" /> </Grid.ColumnDefinitions> <!--Label区域--> <ContentControl x:Name="Label" Template="{TemplateBinding local:ControlAttachProperty.LabelTemplate}" IsTabStop="False" IsHitTestVisible="False" Content="{TemplateBinding local:ControlAttachProperty.Label}" Margin="1,1,0,1"/> <!--附加内容区域--> <Border x:Name="PART_AttachContent" Grid.Column="2" VerticalAlignment="Center" HorizontalAlignment="Center" > <ContentControl VerticalAlignment="Center" VerticalContentAlignment="Center" Template="{TemplateBinding local:ControlAttachProperty.AttachContent}"/> </Border> <!--下拉按钮--> <ToggleButton x:Name="PART_DropDownToggle" IsTabStop="False" Style="{StaticResource FIconToggleButton}" IsChecked="{Binding IsDropDownOpen, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}" Margin="1,1,3,1" Grid.Column="3" local:ControlAttachProperty.FIconSize="{TemplateBinding local:ControlAttachProperty.FIconSize}" Background="{TemplateBinding local:ControlAttachProperty.FocusBackground}"/> <!--水印--> <Border Grid.Column="1"> <TextBlock x:Name="Message" Padding="0" Visibility="Collapsed" Text="{TemplateBinding local:ControlAttachProperty.Watermark}" Foreground="{TemplateBinding Foreground}" IsHitTestVisible="False" Opacity="{StaticResource WatermarkOpacity}" HorizontalAlignment="Left" TextAlignment="Center" VerticalAlignment="Center" Margin="5,2,5,2" /> </Border> <!--Date内容区--> <Grid Grid.Column="1"> <TextBox x:Name="PART_TextBox" Style="{StaticResource EditableTextBoxStyle}" HorizontalAlignment="Stretch" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}" IsHitTestVisible="True" IsReadOnly="True" FontFamily="{TemplateBinding FontFamily}" Foreground="{TemplateBinding Foreground}" FontSize="{TemplateBinding FontSize}" Text="{Binding Path=SelectedDate,Mode=OneWay,RelativeSource={RelativeSource TemplatedParent},StringFormat={StaticResource DateFormat}}"/> </Grid> <!--弹出日历--> <Popup x:Name="PART_Popup" AllowsTransparency="True" Placement="Bottom" PlacementTarget="{Binding ElementName=PART_Root}" StaysOpen="False" /> </Grid> </Grid> <ControlTemplate.Triggers> <!--1.显示水印--> <DataTrigger Binding="{Binding RelativeSource={RelativeSource Self}, Path=Text}" Value=""> <Setter TargetName="Message" Property="Visibility" Value="Visible" /> </DataTrigger> <Trigger Property="IsMouseOver" Value="True"> <Setter Property="BorderBrush" Value="{Binding Path=(local:ControlAttachProperty.MouseOverBorderBrush),RelativeSource={RelativeSource Self}}"/> </Trigger> <Trigger Property="IsFocused" Value="True"> <Setter Property="BorderBrush" Value="{Binding Path=(local:ControlAttachProperty.FocusBorderBrush),RelativeSource={RelativeSource Self}}"/> </Trigger> <Trigger Property="IsKeyboardFocusWithin" Value="True"> <Setter Property="BorderBrush" Value="{Binding Path=(local:ControlAttachProperty.FocusBorderBrush),RelativeSource={RelativeSource Self}}"/> </Trigger> <Trigger Property="IsEnabled" Value="False"> <Setter TargetName="PART_Root" Property="Opacity" Value="{StaticResource DisableOpacity}" /> </Trigger> </ControlTemplate.Triggers> </ControlTemplate> </Setter.Value> </Setter> </Style>
水印效果：
使用示例：
<DatePicker Margin="3" core:ControlAttachProperty.Watermark="妈的快输入日期"/> <DatePicker Margin="3" SelectedDate="{x:Static system:DateTime.Today}"/> <DatePicker Margin="3" IsEnabled="False" SelectedDate="{x:Static system:DateTime.Today}"/>
3.2 Label标签
通过扩展基础样式中的标签附加属性实现，定义样式代码：
<!--DatePicker包含附加属性Label的样式 LabelDatePicker --> <Style TargetType="{x:Type DatePicker}" x:Key="LabelDatePicker" BasedOn="{StaticResource DefaultDatePicker}"> <Setter Property="Width" Value="260"></Setter> <Setter Property="local:ControlAttachProperty.LabelTemplate" > <Setter.Value> <ControlTemplate TargetType="ContentControl"> <Border Width="60" Background="{StaticResource TextLabelBackground}"> <TextBlock VerticalAlignment="Center" HorizontalAlignment="Right" Margin="2" Text="{TemplateBinding Content}"></TextBlock> </Border> </ControlTemplate> </Setter.Value> </Setter> </Style>
效果图：
使用示例：
<DatePicker Margin="3" Style="{StaticResource LabelClearButtonDatePicker}" core:ControlAttachProperty.Watermark="选择出生日期" core:ControlAttachProperty.Label="出生日期"/> <DatePicker Margin="3" Style="{StaticResource LabelDatePicker}" core:ControlAttachProperty.Label="死亡日期" SelectedDate="{x:Static system:DateTime.Today}"/> <DatePicker Margin="3" Style="{StaticResource LabelDatePicker}" core:ControlAttachProperty.Label="非法日期" IsEnabled="False" SelectedDate="{x:Static system:DateTime.Today}"/>
3.3 清除日期值的功能扩展
此功能在前面的文章有介绍过（参考本文末尾链接），效果在上面的图片中可以看到。样式代码：
<!--DatePicker包含清除Text按钮的样式 ClearButtonDatePicker --> <Style TargetType="{x:Type DatePicker}" x:Key="ClearButtonDatePicker" BasedOn="{StaticResource DefaultDatePicker}"> <Setter Property="local:ControlAttachProperty.AttachContent"> <Setter.Value> <ControlTemplate> <local:FButton FIcon="" Style="{StaticResource FButton_Transparency}" IsTabStop="False" FIconMargin="0" local:ControlAttachProperty.IsClearTextButtonBehaviorEnabled="True" Command="local:ControlAttachProperty.ClearTextCommand" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type DatePicker}}}" Margin="1,3,0,4" FIconSize="14" Foreground="{StaticResource TextForeground}" Cursor="Arrow"/> </ControlTemplate> </Setter.Value> </Setter> </Style> <!--DatePicker包含附加属性Label，以及ClearText按钮的样式 LabelClearButtonDatePicker --> <Style TargetType="{x:Type DatePicker}" x:Key="LabelClearButtonDatePicker" BasedOn="{StaticResource DefaultDatePicker}"> <Setter Property="Width" Value="280"></Setter> <Setter Property="local:ControlAttachProperty.LabelTemplate" > <Setter.Value> <ControlTemplate TargetType="ContentControl"> <Border Width="60" Background="{StaticResource TextLabelBackground}"> <TextBlock VerticalAlignment="Center" HorizontalAlignment="Right" Margin="2" Text="{TemplateBinding Content}"></TextBlock> </Border> </ControlTemplate> </Setter.Value> </Setter> <Setter Property="local:ControlAttachProperty.AttachContent"> <Setter.Value> <ControlTemplate> <local:FButton FIcon="" Style="{StaticResource FButton_Transparency}" IsTabStop="False" FIconMargin="0" local:ControlAttachProperty.IsClearTextButtonBehaviorEnabled="True" Command="local:ControlAttachProperty.ClearTextCommand" CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor,AncestorType={x:Type DatePicker}}}" Margin="0,3,0,4" FIconSize="14" Foreground="{StaticResource TextForeground}" Cursor="Arrow"/> </ControlTemplate> </Setter.Value> </Setter> </Style>
使用示例：
<DatePicker Margin="3" Style="{StaticResource ClearButtonDatePicker}"/> <DatePicker Margin="3" Style="{StaticResource LabelClearButtonDatePicker}" core:ControlAttachProperty.Watermark="选择出生日期" core:ControlAttachProperty.Label="出生日期"/>
附录：参考引用
WPF自定义控件与样式(1)-矢量字体图标(iconfont)
WPF自定义控件与样式(3)-TextBox & RichTextBox & PasswordBox样式、水印、Label标签、功能扩展
WPF自定义控件与样式(4)-CheckBox/RadioButton自定义样式
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