我有一个扩展器放在一个蓝色背景的窗口上,我想让扩展器的按钮不同于默认颜色(蓝色,它从窗口接收)。当我修改扩展器的背景属性时,它会将整个扩展器、标题和所有内容更改为新颜色。但是,我只想更改按钮本身。谁能指出我正在寻找的正确属性(property)?
谢谢

最佳答案

您不仅需要重新模板化扩展器...您还需要重新模板化扩展器模板中的 ToggleButton ......以便您可以模板绑定(bind)扩展器上设置的背景画笔,一直向下贯穿扩展器的视觉效果并进入ToggleButton 的视觉效果(使用两个 TemplateBindings)。

当您学习如何修改 WPF 控件的视觉效果时(至少对我而言)有用的一件事是使用 SimpleStyles,因为它们比完全成熟的普通样式和模板更容易复制和修改…… .

为此,打开 Blend 并进入 Assets 库(最底部的工具)...如果单击它,您将看到两组控件:系统控件和简单样式。从 Simple Styles 中获取一个控件(无论你想要哪个),然后将它放在设计图面上。然后,您可以右键单击它,编辑控制部件(模板),然后编辑副本。这将创建 Simple Styles 样式和模板的副本......然后您可以(更轻松地)修改您的内容。

(此时我应该注意,然后我将在 Visual Studio 和 Blend 中修改该 xaml(由 Blend 生成)......根据需要来回翻转......并利用每个的优势:Blend for its WYSIWYG设计图面……以及 Visual Studio 的代码编辑和 IntelliSense 支持。)

我已经起草了一些快速的 xaml 来满足你的要求,并将在下面包含它。您应该能够在 Kaxaml 或其他松散的 xaml 编辑器中删除此 xaml。

希望这可以帮助。

<Page
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Width="640"
    Height="480"
>
    <Page.Resources>
        <LinearGradientBrush x:Key="NormalBrush" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="#EEE" Offset="0.0"/>
            <GradientStop Color="#CCC" Offset="1.0"/>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="NormalBorderBrush" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="#CCC" Offset="0.0"/>
            <GradientStop Color="#444" Offset="1.0"/>
        </LinearGradientBrush>
        <SolidColorBrush x:Key="GlyphBrush" Color="#444"/>
        <LinearGradientBrush x:Key="MouseOverBrush" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="#FFF" Offset="0.0"/>
            <GradientStop Color="#AAA" Offset="1.0"/>
        </LinearGradientBrush>
        <LinearGradientBrush x:Key="PressedBrush" EndPoint="0,1" StartPoint="0,0">
            <GradientStop Color="#BBB" Offset="0.0"/>
            <GradientStop Color="#EEE" Offset="0.1"/>
            <GradientStop Color="#EEE" Offset="0.9"/>
            <GradientStop Color="#FFF" Offset="1.0"/>
        </LinearGradientBrush>

        <ControlTemplate x:Key="newToggleButtonControlTemplate" TargetType="{x:Type ToggleButton}">
            <Grid Background="{TemplateBinding Background}">
                <Rectangle
                    x:Name="Rectangle"
                    Margin="0,0,0,0"
                    Fill="Transparent"
                    Stroke="{DynamicResource NormalBorderBrush}"
                />
                <Path
                    x:Name="Up_Arrow"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Fill="{DynamicResource GlyphBrush}"
                    Data="M 0 0 L 4 4 L 8 0 Z"
                />
                <Path
                    x:Name="Down_Arrow"
                    Visibility="Collapsed"
                    HorizontalAlignment="Center"
                    VerticalAlignment="Center"
                    Fill="{DynamicResource GlyphBrush}"
                    Data="M 0 4 L 4 0 L 8 4 Z"
                />
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger Property="IsMouseOver" Value="true">
                    <Setter Property="Fill" Value="{DynamicResource MouseOverBrush}" TargetName="Rectangle"/>
                </Trigger>
                <Trigger Property="IsPressed" Value="true">
                    <Setter Property="Fill" Value="{DynamicResource PressedBrush}" TargetName="Rectangle"/>
                </Trigger>
                <Trigger Property="IsChecked" Value="true">
                    <Setter Property="Visibility" Value="Visible" TargetName="Down_Arrow"/>
                    <Setter Property="Visibility" Value="Collapsed" TargetName="Up_Arrow"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>
        <Style x:Key="newExpanderStyle" TargetType="{x:Type Expander}">
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Expander}">
                        <Grid>
                            <Grid.RowDefinitions>
                                <RowDefinition Height="Auto"/>
                                <RowDefinition Height="*" x:Name="ContentRow"/>
                            </Grid.RowDefinitions>
                            <Border
                                x:Name="Border"
                                Grid.Row="0"
                                BorderThickness="{TemplateBinding BorderThickness}"
                                CornerRadius="2,2,0,0"
                            >
                                <Grid>
                                    <Grid.ColumnDefinitions>
                                        <ColumnDefinition Width="20"/>
                                        <ColumnDefinition Width="*"/>
                                    </Grid.ColumnDefinitions>
                                    <ToggleButton
                                        Template="{DynamicResource newToggleButtonControlTemplate}"
                                        Background="{TemplateBinding Background}"
                                        IsChecked="{Binding Path=IsExpanded, Mode=TwoWay, RelativeSource={RelativeSource TemplatedParent}}"
                                        OverridesDefaultStyle="True"
                                    />
                                    <ContentPresenter Grid.Column="1" Margin="4" RecognizesAccessKey="True" ContentSource="Header"/>
                                </Grid>
                            </Border>
                            <Border
                                x:Name="ExpandSite"
                                Grid.Row="1"
                                Visibility="Collapsed"
                                BorderThickness="1,0,1,1"
                                CornerRadius="0,0,2,2"
                            >
                                <ContentPresenter
                                    HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
                                    VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
                                    Margin="{TemplateBinding Padding}"
                                    Focusable="false"
                                />
                            </Border>
                        </Grid>
                        <ControlTemplate.Triggers>
                            <Trigger Property="IsExpanded" Value="True">
                                <Setter Property="Visibility" Value="Visible" TargetName="ExpandSite"/>
                            </Trigger>
                        </ControlTemplate.Triggers>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </Page.Resources>

    <Page.Background>
        <LinearGradientBrush EndPoint="0.997,0.996" StartPoint="0.002,0.058">
            <GradientStop Color="#FF63A6DE" Offset="0"/>
            <GradientStop Color="#FFC2DEF5" Offset="1"/>
        </LinearGradientBrush>
    </Page.Background>

    <Grid x:Name="LayoutRoot">
        <Expander
            Style="{DynamicResource newExpanderStyle}"
            Header="Expander"
            HorizontalAlignment="Left"
            VerticalAlignment="Top"
            Background="{DynamicResource NormalBrush}"
        >
            <Grid>
                <Button Content="Hello World"/>
            </Grid>
        </Expander>
    </Grid>
</Page>

10-08 19:00