【转】WPF自定义控件与样式(5)-Calendar/DatePicker日期控件自定义样式及扩展

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。

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="&#xe65e;"/>
                                    <local:FButton  x:Name="PART_NextButton" Style="{StaticResource FButton_Transparency}"
                                                    Focusable="False" Grid.Column="2" FIconSize="18" Content="" FIcon="&#xe605;"/>
                                </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="&#xe60a;" 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="&#xe60a;" 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"/>

原文地址：http://www.cnblogs.com/anding/p/4979764.html