WPF:以自定义样式以编程方式更改控件的颜色

Question

<DrawingImage x:Key="HexagonImage">
    <DrawingImage.Drawing>
        <DrawingGroup>
            <GeometryDrawing Brush="White"  
                       Geometry="M 250,0 L 750,0 L 1000,433 L 750,866 L 250,866 L 0,433 Z">
                <GeometryDrawing.Pen>
                    <Pen Brush="Black" Thickness="10" LineJoin="Round"/>
                </GeometryDrawing.Pen>
            </GeometryDrawing>
        </DrawingGroup>
    </DrawingImage.Drawing>
</DrawingImage>

<Style x:Key="HexagonButton" TargetType="{x:Type Button}">
    <Setter Property="Template">
        <Setter.Value>
        <ControlTemplate TargetType="{x:Type Button}">
            <Grid>
                <Image x:Name="hexImg" Source="{StaticResource HexagonImage}"/>
                <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
            </Grid>
        </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

我有一个按钮,它有这个HexagonButton作为它的样式,我想以编程方式改变它的颜色,我试过改变Backgroup属性,但无济于事.

我设法做到的唯一方法是使用新的绘图图像创建一个全新的样式.并分配它.但我确信有一种更简单的方法可以做到这一点.

Answer 1

GeomteryDrawing我通过将直接包含在Button模板中，并使用对其祖先的和属性的RelativeSource绑定（我在样式声明中为其指定了默认值）来使其工作：ForegroundBackgroundButton

<Style x:Key="HexagonButton" TargetType="{x:Type Button}">
    <Setter Property="Background" Value="White" />
    <Setter Property="Foreground" Value="Black" />
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="{x:Type Button}">
                <Grid>
                    <Image x:Name="hexImg">
                        <Image.Source>
                            <DrawingImage>
                                <DrawingImage.Drawing>
                                    <DrawingGroup>
                                        <GeometryDrawing Brush="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}}, Path=Background}" Geometry="M 250,0 L 750,0 L 1000,433 L 750,866 L 250,866 L 0,433 Z">
                                            <GeometryDrawing.Pen>
                                                <Pen Brush="{Binding RelativeSource={RelativeSource AncestorType={x:Type Button}}, Path=Foreground}" Thickness="10" LineJoin="Round" />
                                            </GeometryDrawing.Pen>
                                        </GeometryDrawing>
                                    </DrawingGroup>
                                </DrawingImage.Drawing>
                            </DrawingImage>
                        </Image.Source>
                    </Image>
                    <ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center" />
                </Grid>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

默认的白色和黑色按钮是：

<Button Style="{StaticResource HexagonButton}">Click me</Button>

自定义按钮是：

<Button Style="{StaticResource HexagonButton}" Background="Yellow" Foreground="Red">Click me</Button>