自定义 WPF DatePickerTextBox 模板

Question

我正在尝试在

TextBox

控件中使用自定义

DatePicker

，但我无法将弹出日历中的日期绑定到

TextBox

。除非必须，否则我不想对整个

DatePicker

进行样式设置，并且

DatePickerTextBox

有自己的控件，因此必须有一种方法只能更改它。下面的代码是我的开始：

<Style TargetType="{x:Type DatePickerTextBox}">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DatePickerTextBox}">
                <TextBox x:Name="PART_TextBox" Text="{Binding Path=SelectedDate}" />
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我可能没有正确进行绑定，或者

PART_TextBox

可能不正确，因为它不是

DatePicker

模板本身的一部分。

Answer 1

试试这个：

<DatePicker>
    <DatePicker.Resources>
        <Style TargetType="{x:Type DatePickerTextBox}">
            <Setter Property="Control.Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBox x:Name="PART_TextBox" 
                                    Text="{Binding Path=SelectedDate, RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DatePicker.Resources>
</DatePicker>

Answer 2

我意识到这个问题已经回答了很长时间了，但是直接绑定到 DatePicker 的 Text 属性将允许控件模板中的 TextBox 轻松遵循 DatePicker 提供的短/长格式。

<DatePicker>
    <DatePicker.Resources>
        <Style TargetType="{x:Type DatePickerTextBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <TextBox Text="{Binding Text, RelativeSource={RelativeSource AncestorType={x:Type DatePicker}}}" />
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DatePicker.Resources>
</DatePicker>

“PART_TextBox”也不是必需的，因为它不是 DatePickerTextBox 模板的一部分。 DatePickerTextBox 包含的唯一部分是：

[TemplatePart(Name = DatePickerTextBox.ElementContentName, Type = typeof(ContentControl))]
public sealed partial class DatePickerTextBox : TextBox

private const string ElementContentName = "PART_Watermark";

并继承自TextBoxBase...

[TemplatePart(Name = "PART_ContentHost", Type = typeof(FrameworkElement))] 
public abstract class TextBoxBase : Control

internal const string ContentHostTemplateName = "PART_ContentHost";

替代解决方案： 如果您选择不使用 TextBox 并使用继承的 PART，您将能够更改 DatePickerTextBox，而无需更改控件的默认功能。

<DatePicker>
    <DatePicker.Resources>
        <Style TargetType="{x:Type DatePickerTextBox}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate>
                        <Grid SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
                            <Border BorderThickness="{TemplateBinding BorderThickness}"
                                    BorderBrush="{TemplateBinding BorderBrush}"
                                    Background="{TemplateBinding Background}"/>

                            <ScrollViewer Name="PART_ContentHost"
                                          HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                          VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </DatePicker.Resources>
</DatePicker>

Answer 3

如果您在 XAML 中声明一个元素 (1)，然后在

Design

视图中查看它，则可以右键单击 (2) 并导出其模板 (3)：

1

<Window ...attributes...>
    <Grid>
        <DatePickerTextBox />
    </Grid>
</Window>

2

3

<Style x:Key="DatePickerTextBoxStyle1" TargetType="{x:Type DatePickerTextBox}">
    <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"/>
    <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
    <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
    <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type DatePickerTextBox}">
                <Grid>
                    <Grid.Resources>
                        <SolidColorBrush x:Key="WatermarkBrush" Color="#FFAAAAAA"/>
                    </Grid.Resources>
                    <VisualStateManager.VisualStateGroups>
                        <VisualStateGroup x:Name="CommonStates">
                            <VisualStateGroup.Transitions>
                                <VisualTransition GeneratedDuration="0"/>
                                <VisualTransition GeneratedDuration="0:0:0.1" To="MouseOver"/>
                            </VisualStateGroup.Transitions>
                            <VisualState x:Name="Normal"/>
                            <VisualState x:Name="MouseOver">
                                <Storyboard>
                                    <ColorAnimation Duration="0" To="#FF99C1E2" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="ContentElement"/>
                                    <ColorAnimation Duration="0" To="#FF99C1E2" Storyboard.TargetProperty="(Border.BorderBrush).(SolidColorBrush.Color)" Storyboard.TargetName="watermark_decorator"/>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="WatermarkStates">
                            <VisualStateGroup.Transitions>
                                <VisualTransition GeneratedDuration="0"/>
                            </VisualStateGroup.Transitions>
                            <VisualState x:Name="Unwatermarked"/>
                            <VisualState x:Name="Watermarked">
                                <Storyboard>
                                    <DoubleAnimation Duration="0" To="0" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="ContentElement"/>
                                    <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="PART_Watermark"/>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                        <VisualStateGroup x:Name="FocusStates">
                            <VisualStateGroup.Transitions>
                                <VisualTransition GeneratedDuration="0"/>
                            </VisualStateGroup.Transitions>
                            <VisualState x:Name="Unfocused"/>
                            <VisualState x:Name="Focused">
                                <Storyboard>
                                    <DoubleAnimation Duration="0" To="1" Storyboard.TargetProperty="Opacity" Storyboard.TargetName="FocusVisual"/>
                                </Storyboard>
                            </VisualState>
                        </VisualStateGroup>
                    </VisualStateManager.VisualStateGroups>
                    <Border x:Name="Border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" CornerRadius="1" Opacity="1" Padding="{TemplateBinding Padding}">
                        <Grid x:Name="WatermarkContent" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}">
                            <Border x:Name="ContentElement" BorderBrush="#FFFFFFFF" BorderThickness="1"/>
                            <Border x:Name="watermark_decorator" BorderBrush="#FFFFFFFF" BorderThickness="1">
                                <ContentControl x:Name="PART_Watermark" Focusable="False" IsHitTestVisible="False" Opacity="0" Padding="2"/>
                            </Border>
                            <ScrollViewer x:Name="PART_ContentHost" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" Margin="0" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}"/>
                            <Border x:Name="FocusVisual" BorderBrush="#FF45D6FA" CornerRadius="1" IsHitTestVisible="False" Opacity="0"/>
                        </Grid>
                    </Border>
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>