我正在尝试重新设置 Extended WPF Toolkit 中 DateTimePicker 的控件模板的样式.这是它应该的样子的图片:
这是原始代码的相关部分:
[TemplatePart( Name = PART_Calendar, Type = typeof( Calendar ) )]
[TemplatePart( Name = PART_TimeUpDown, Type = typeof( TimePicker ) )]
public class DateTimePicker : DateTimePickerBase
{
private const string PART_Calendar = "PART_Calendar";
private const string PART_TimeUpDown = "PART_TimeUpDown";
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
if( _calendar != null )
_calendar.SelectedDatesChanged -= Calendar_SelectedDatesChanged;
_calendar = GetTemplateChild( PART_Calendar ) as Calendar;
if( _calendar != null )
{
_calendar.SelectedDatesChanged += Calendar_SelectedDatesChanged;
_calendar.SelectedDate = Value ?? null;
_calendar.DisplayDate = Value ?? this.ContextNow;
this.SetBlackOutDates();
}
_timePicker = GetTemplateChild( PART_TimeUpDown ) as TimePicker;
}
}
<Style TargetType="{x:Type local:DateTimePicker}">
...
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type local:DateTimePicker}">
...
<StackPanel>
<Calendar x:Name="PART_Calendar" BorderThickness="0" />
<local:TimePicker x:Name="PART_TimeUpDown" ... />
</StackPanel>
...
</ControlTemplate>
</Setter.Value>
<Setter>
</Style>
现在因为 DateTimePicker 在代码背后有相当多的逻辑来调整特定事件的日历部分的属性，我不想重新发明轮子。理想情况下，我希望能够像这样简单地重新设置控件的样式:
自定义样式.xaml
<Style x:Key="MetroDateTimePicker" TargetType="{x:Type xctk:DateTimePicker}">
<Setter Property="Foreground" Value="{DynamicResource TextBrush}"/>
<Setter Property="Background" Value="{DynamicResource ControlBackgroundBrush}"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="BorderBrush" Value="{DynamicResource TextBoxBorderBrush}"/>
<Setter Property="FocusVisualStyle" Value="{x:Null}"/>
<Setter Property="FontFamily" Value="{DynamicResource ContentFontFamily}"/>
<Setter Property="FontSize" Value="{DynamicResource ContentFontSize}"/>
<Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
<Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type xctk:DateTimePicker}">
<Grid>
<Border x:Name="Base"
Background="{TemplateBinding Background}"
BorderBrush="{TemplateBinding BorderBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
<Grid Margin="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="Auto" />
</Grid.ColumnDefinitions>
<xctk:ButtonSpinner x:Name="PART_Spinner"
Grid.Column="0"
BorderThickness="0"
IsTabStop="False"
Background="Transparent"
Style="{StaticResource MetroButtonSpinner}"
AllowSpin="{TemplateBinding AllowSpin}"
ShowButtonSpinner="{TemplateBinding ShowButtonSpinner}">
<xctk:WatermarkTextBox x:Name="PART_TextBox"
BorderThickness="0"
Background="Transparent"
FontFamily="{TemplateBinding FontFamily}"
FontSize="{TemplateBinding FontSize}"
FontStretch="{TemplateBinding FontStretch}"
FontStyle="{TemplateBinding FontStyle}"
FontWeight="{TemplateBinding FontWeight}"
Foreground="{TemplateBinding Foreground}"
HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}"
IsReadOnly="{Binding IsReadOnly, RelativeSource={RelativeSource TemplatedParent}}"
MinWidth="20"
AcceptsReturn="False"
Padding="0"
TextAlignment="{TemplateBinding TextAlignment}"
TextWrapping="NoWrap"
Text="{Binding Text, RelativeSource={RelativeSource TemplatedParent}}"
TabIndex="{TemplateBinding TabIndex}"
Watermark="{TemplateBinding Watermark}"
WatermarkTemplate="{TemplateBinding WatermarkTemplate}" />
</xctk:ButtonSpinner>
<ToggleButton x:Name="_calendarToggleButton"
Background="{TemplateBinding Background}"
Grid.Column="1"
IsChecked="{Binding IsOpen, RelativeSource={RelativeSource TemplatedParent}}"
Style="{DynamicResource ChromelessButtonStyle}"
Foreground="{TemplateBinding Foreground}"
IsTabStop="False">
<Path Fill="{TemplateBinding Foreground}"
Data="..."
Stretch="Uniform">
<Path.Width>
<Binding RelativeSource="{RelativeSource TemplatedParent}"
Path="FontSize"
Converter="{x:Static shared:FontSizeOffsetConverter.Instance}">
<Binding.ConverterParameter>
<sys:Double>4</sys:Double>
</Binding.ConverterParameter>
</Binding>
</Path.Width>
<Path.Height>
<Binding RelativeSource="{RelativeSource TemplatedParent}"
Path="FontSize"
Converter="{x:Static shared:FontSizeOffsetConverter.Instance}">
<Binding.ConverterParameter>
<sys:Double>4</sys:Double>
</Binding.ConverterParameter>
</Binding>
</Path.Height>
</Path>
</ToggleButton>
</Grid>
<Popup x:Name="PART_Popup"
AllowsTransparency="True"
IsOpen="{Binding IsChecked, ElementName=_calendarToggleButton}"
PopupAnimation="{DynamicResource {x:Static SystemParameters.ComboBoxPopupAnimationKey}}"
StaysOpen="False">
<Border Padding="3"
Background="{DynamicResource WhiteBrush}"
BorderBrush="{DynamicResource ComboBoxPopupBrush}"
BorderThickness="{TemplateBinding BorderThickness}"
Effect="{DynamicResource DropShadowBrush}">
<StackPanel>
<Calendar x:Name="Part_Calendar"
BorderThickness="0"
MinWidth="115"
DisplayDateStart="{Binding Minimum, RelativeSource={RelativeSource TemplatedParent}}"
DisplayDateEnd="{Binding Maximum, RelativeSource={RelativeSource TemplatedParent}}"
IsTodayHighlighted="False"/>
<xctk:TimePicker x:Name="PART_TimeUpDown"
Style="{StaticResource MetroTimePicker}"
Background="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"
Foreground="{DynamicResource {x:Static SystemColors.WindowTextBrushKey}}"
Format="{TemplateBinding TimeFormat}"
FormatString="{TemplateBinding TimeFormatString}"
Value="{Binding Value, RelativeSource={RelativeSource TemplatedParent}}"
Minimum="{Binding Minimum, RelativeSource={RelativeSource TemplatedParent}}"
Maximum="{Binding Maximum, RelativeSource={RelativeSource TemplatedParent}}"
ClipValueToMinMax="{Binding ClipValueToMinMax, RelativeSource={RelativeSource TemplatedParent}}"
IsUndoEnabled="{Binding IsUndoEnabled, RelativeSource={RelativeSource TemplatedParent}}"
AllowSpin="{TemplateBinding TimePickerAllowSpin}"
ShowButtonSpinner="{TemplateBinding TimePickerShowButtonSpinner}"
Watermark="{TemplateBinding TimeWatermark}"
WatermarkTemplate="{TemplateBinding TimeWatermarkTemplate}"
Visibility="{TemplateBinding TimePickerVisibility}"
Margin="3 0 3 3"/>
</StackPanel>
</Border>
</Popup>
</Grid>
<ControlTemplate.Triggers>
<MultiDataTrigger>
<MultiDataTrigger.Conditions>
<Condition Binding="{Binding IsReadOnly, RelativeSource={RelativeSource Self}}" Value="False" />
<Condition Binding="{Binding AllowTextInput, RelativeSource={RelativeSource Self}}" Value="False" />
</MultiDataTrigger.Conditions>
<Setter Property="IsReadOnly" Value="True" TargetName="PART_TextBox" />
</MultiDataTrigger>
<DataTrigger Binding="{Binding IsReadOnly, RelativeSource={RelativeSource Self}}" Value="True">
<Setter Property="IsReadOnly" Value="True" TargetName="PART_TextBox" />
</DataTrigger>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.GrayTextBrushKey}}" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
注意:这不是我唯一改变的；实际上我还省略了两种样式(MetroTimePicker 和 MetroButtonSpinner)。在大多数情况下，一切看起来都很好，但表现不佳。每当我在代码中设置断点时(在调用 ApplyTemplate 之后)，我都可以看到私有(private) _calendar 字段为空。直接调用 myPicker.GetTemplateChild("PART_Calendar") 也会返回 null(这在 Watch 或 Immediate 窗口中是可能的)。
似乎当我应用自定义样式时，它不再能够拾取模板中的命名元素。我一定遗漏了一些东西，因为我认为我可以应用几乎任何控件模板，只要所有命名部分都在那里(并且具有适当的类型)。所以我的问题是，如何将自定义模板应用于 WPF 控件并确保与其命名部分关联的任何逻辑继续按预期工作？
最佳答案
好吧，我是个白痴。我不知道我看了多久，对每个名字都进行了双重和三次检查，但不知何故我从来没有看到这个愚蠢的小错别字:
<Calendar x:Name="Part_Calendar" … />
应该是:
<Calendar x:Name="<b><em>PART</em></b>_Calendar" … />关于c# - 使用现有部件重新设计控件模板，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/36610371/