2
我創建了一個具有兩個TemplateParts的CustomControl。CustomControl與TemplateParts
using System;
using System.Windows;
using System.Windows.Controls;
namespace WpfCustomControlLibrary1
{
[TemplatePart(Name = "PART_ControlsLayer", Type = typeof (ContentPresenter))]
[TemplatePart(Name = "PART_DisplayLayer", Type = typeof (ContentPresenter))]
public class CustomControl1 : Control
{
public static readonly DependencyProperty ControlsLayerProperty =
DependencyProperty.Register("ControlsLayer", typeof (object), typeof (CustomControl1),
new UIPropertyMetadata(null));
public static readonly DependencyProperty DisplayLayerProperty =
DependencyProperty.Register("DisplayLayer", typeof (object), typeof (CustomControl1),
new UIPropertyMetadata(null));
private ContentPresenter partControlsLayer;
private ContentPresenter partDisplayLayer;
static CustomControl1()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof (CustomControl1),
new FrameworkPropertyMetadata(typeof (CustomControl1)));
}
public object ControlsLayer
{
get { return GetValue(ControlsLayerProperty); }
set { SetValue(ControlsLayerProperty, value); }
}
public object DisplayLayer
{
get { return GetValue(DisplayLayerProperty); }
set { SetValue(DisplayLayerProperty, value); }
}
public override void OnApplyTemplate()
{
ApplyTemplate();
partControlsLayer = GetTemplateChild("PART_ControlsLayer") as ContentPresenter;
partDisplayLayer = GetTemplateChild("PART_DisplayLayer") as ContentPresenter;
if (partControlsLayer == null || partDisplayLayer == null)
{
throw new NullReferenceException("Template parts not available");
}
}
}
}
在Generic.xaml我所定義的的ControlTemplate和默認設定器用於DisplayLayer中的（所述TemplateParts之一）。最後，我將其設置爲CustomControl1的模板。
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfCustomControlLibrary1">
<Style TargetType="{x:Type local:CustomControl1}">
<Style.Resources>
<ControlTemplate x:Key="DefaulTemplate" TargetType="{x:Type local:CustomControl1}">
<Grid>
<ContentPresenter x:Name="PART_ControlsLayer"
Content="{TemplateBinding ControlsLayer}" />
<ContentPresenter x:Name="PART_DisplayLayer"
Content="{TemplateBinding DisplayLayer}" />
</Grid>
</ControlTemplate>
</Style.Resources>
<Setter Property="DisplayLayer">
<Setter.Value>
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Label Grid.Row="0" Content="{Binding FunctionName, FallbackValue=Functionname}" />
<TextBlock Grid.Row="1" Text="{Binding DisplayValue, FallbackValue=0.0dB}" Foreground="Lime"
Background="Black" />
</Grid>
</Setter.Value>
</Setter>
<Setter Property="Template" Value="{StaticResource DefaulTemplate}"/>
</Style>
<Style TargetType="{x:Type local:CustomControl2}" BasedOn="{StaticResource {x:Type local:CustomControl1}}" />
</ResourceDictionary>
現在我創建一個CustomControl2 BasedOn CustomControl1。
using System.Windows;
namespace WpfCustomControlLibrary1
{
public class CustomControl2 : CustomControl1
{
static CustomControl2()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(CustomControl2), new FrameworkPropertyMetadata(typeof(CustomControl2)));
}
}
}
然後我把兩個控件放在一個WpfWindow上。
<Window x:Class="WpfApplication1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:wpfCustomControlLibrary1="clr-namespace:WpfCustomControlLibrary1;assembly=WpfCustomControlLibrary1"
Title="MainWindow" Height="350" Width="525">
<Grid>
<Grid.RowDefinitions>
<RowDefinition/>
<RowDefinition/>
</Grid.RowDefinitions>
<wpfCustomControlLibrary1:CustomControl1 Grid.Row="0"/>
<wpfCustomControlLibrary1:CustomControl2 Grid.Row="1"/>
</Grid>
</Window>
問題是我只能在第二個控件上看到Defaulttemplate。我找不到解決方法，請幫忙。
@ gomi42 - 如果我改變Generic.xaml這樣：
<ResourceDictionary
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:local="clr-namespace:WpfCustomControlLibrary1">
<Style x:Key="BaseStyle" TargetType="{x:Type local:CustomControl1}">
<Style.Resources>
<ControlTemplate x:Key="DefaulTemplate" TargetType="{x:Type local:CustomControl1}">
<Grid>
<ContentPresenter x:Name="PART_ControlsLayer"
Content="{TemplateBinding ControlsLayer}" />
<ContentPresenter x:Name="PART_DisplayLayer"
Content="{TemplateBinding DisplayLayer}" />
</Grid>
</ControlTemplate>
</Style.Resources>
<Setter Property="Template" Value="{StaticResource DefaulTemplate}"/>
<Setter Property="DisplayLayer">
<Setter.Value>
<Grid>
<Grid.RowDefinitions>
<RowDefinition />
<RowDefinition />
<RowDefinition />
<RowDefinition />
</Grid.RowDefinitions>
<Label Grid.Row="0" Content="{Binding FunctionName, FallbackValue=Functionname}" />
<TextBlock Grid.Row="1" Text="{Binding DisplayValue, FallbackValue=0.0dB}" Foreground="Lime"
Background="Black" />
</Grid>
</Setter.Value>
</Setter>
</Style>
<Style TargetType="{x:Type local:CustomControl1}" BasedOn="{StaticResource BaseStyle}" />
<Style TargetType="{x:Type local:CustomControl2}" BasedOn="{StaticResource BaseStyle}" />
</ResourceDictionary>
沒有什麼變化！僅在第二個控件中仍然可見。
我不明白。如果我這樣做，我應該在哪裏放置模板屬性的setter？ – GreenEyedAndy
看到我編輯的問題 – GreenEyedAndy
看起來好像是靜態的，所以只能在使用這種風格的最後一個控件上看到。嘗試在MainWindow中添加另一行並添加第三個控件（例如另一個CustomControl2）。它又是顯示內容的最後一個控件。 – GreenEyedAndy