使用画布作为具有可绑定颜色的图标



与许多WPF用户一样,我使用此模式创建矢量图标:

1-定义Canvas包含数据:

资源项

<Canvas Width="256" Height="256" ClipToBounds="True" x:Key="SubmitVisualIcon">
    <Path Fill="#FFFFFF00">
        <Path.Data>
            <PathGeometry FillRule="Nonzero" Figures="M44.436129,25.256006L54.222273,25.256006 75.259996,46.29286 70.368799,51.187792 54.094614,67.462006 44.561911,67.462006 44.436129,67.337162 62.016504,49.752106 15.633995,49.752106 15.633995,42.837337 62.016504,42.837337z M45,5.6100006C23.245507,5.6100006 5.6100006,23.245506 5.6100006,45 5.6100006,66.754498 23.245507,84.389999 45,84.389999 66.754499,84.389999 84.389997,66.754498 84.389997,45 84.389997,23.245506 66.754499,5.6100006 45,5.6100006z M45,0C69.852816,0 89.999998,20.147187 89.999998,45 89.999998,69.852814 69.852816,90.000004 45,90.000004 20.147188,90.000004 9.5367432E-07,69.852814 0,45 9.5367432E-07,20.147187 20.147188,0 45,0z"/>
        </Path.Data>
    </Path>
</Canvas>

2-在控制模板中使用:

控制模板

<ControlTemplate x:Key="MyButton" TargetType="{x:Type Button}">
    <Border x:Name="root">
        <Grid>
            <Rectangle VerticalAlignment="Center" HorizontalAlignment="Center" 
                       RenderOptions.BitmapScalingMode="HighQuality"
                       Width="32" Height="32">
                <Rectangle.Fill>
                    <VisualBrush Stretch="Fill">
                        <VisualBrush.Visual>
                            <Binding Path="(ui:UIElement.VisualIcon)"
                                     RelativeSource="{RelativeSource TemplatedParent}"/>
                        </VisualBrush.Visual>
                    </VisualBrush>
                </Rectangle.Fill>
            </Rectangle>
            <ContentPresenter />
        </Grid>
    </Border>
</ControlTemplate>

ui:UIElement.VisualIcon属性是用于告诉模板使用哪个资源的附加属性。例如:

<Button Content="Save" ui:UIElement.VisualIcon="{DynamicResource SubmitVisualIcon}">

现在,正如你所看到的,我必须得到Canvas中的Path一个Fill值:

<Path Fill="#FFFFFF00">

问题是,是否可以将Fill值绑定到TemplatedParent上的某个值?例如,我有一个附加属性来持有图标刷:

<Button Content="Save" ui:UIElement.VisualIcon="{DynamicResource SubmitVisualIcon}"
                       ui:UIElement.VisualIconForeground="Some_Brush">

我试着像下面这样使用它:

<Path Fill="{Binding ui:UIElement.VisualIconForeground,RelativeSource={RelativeSource TemplatedParent}}">

但它不起作用。你有这个主意吗?我的意思是,将资源项的某些属性绑定到将要使用的位置-英语不好,我知道,对不起:(

最后我找到了一个适用于case的解决方案。我应该使用Rectangle.OpacityMask而不是Rectangle.Fill:

资源:

<Canvas Width="256" Height="256" ClipToBounds="True" x:Key="SubmitVisualIcon">
    <Path Fill="#FFFFFF00">
        <Path.Data>
            <PathGeometry FillRule="Nonzero" Figures="M44.436129,25.256006L54.222273,25.256006 75.259996,46.29286 70.368799,51.187792 54.094614,67.462006 44.561911,67.462006 44.436129,67.337162 62.016504,49.752106 15.633995,49.752106 15.633995,42.837337 62.016504,42.837337z M45,5.6100006C23.245507,5.6100006 5.6100006,23.245506 5.6100006,45 5.6100006,66.754498 23.245507,84.389999 45,84.389999 66.754499,84.389999 84.389997,66.754498 84.389997,45 84.389997,23.245506 66.754499,5.6100006 45,5.6100006z M45,0C69.852816,0 89.999998,20.147187 89.999998,45 89.999998,69.852814 69.852816,90.000004 45,90.000004 20.147188,90.000004 9.5367432E-07,69.852814 0,45 9.5367432E-07,20.147187 20.147188,0 45,0z"/>
        </Path.Data>
    </Path>
</Canvas>

模板:

<ControlTemplate x:Key="MyButton" TargetType="{x:Type Button}">
    <Border x:Name="root">
        <Grid>
            <Rectangle VerticalAlignment="Center" HorizontalAlignment="Center" 
                       RenderOptions.BitmapScalingMode="HighQuality"
                       Width="32" Height="32"
                       Fill="{TemplateBinding ui:UIElement.VisualIconForeground}">
                <!-- fill the rectangle with what color do you want, it also can be bounded to every thing -->
                <!-- and then, use the Canvas as a OpacityMask on rectangle, just like this: -->
                <Rectangle.OpacityMask>
                    <VisualBrush Stretch="Fill">
                        <VisualBrush.Visual>
                            <Binding Path="(ui:UIElement.VisualIcon)"
                                     RelativeSource="{RelativeSource TemplatedParent}"/>
                        </VisualBrush.Visual>
                    </VisualBrush>
                </Rectangle.OpacityMask>
                <!-- this will show the icon with color you defined in Rectangle.Fill -->
            </Rectangle>
            <ContentPresenter />
        </Grid>
    </Border>
</ControlTemplate>

用法:

<Button Content="Save" ui:UIElement.VisualIcon="{DynamicResource SubmitVisualIcon}"
                       ui:UIElement.VisualIconForeground="Some_Brush">

其他用法:

<Button Content="Save" ui:UIElement.VisualIcon="{DynamicResource SubmitVisualIcon}"
                       ui:UIElement.VisualIconForeground="Some_Another_Brush">

另一种用法2:

<Button Content="Save" ui:UIElement.VisualIcon="{DynamicResource AnotherVisualIcon}"
                       ui:UIElement.VisualIconForeground="Some_Another_Brush">

注释太长,所以我将在这里写:

如果我理解正确的话,SubmitVisualIcon就是Resource。资源Binding不支持,因此不能将BindingTemplatedParent一起使用,因为Resource不是可视化树的一部分,也不是模板的一部分。也许你将不得不寻找一个替代方案。

作为替代方案,您可以使用应用程序支持的设置。在设置中设置颜色,并在资源中引用它,如下所示:

xmlns:properties="clr-namespace:MyNamespace.Properties"
<Path Fill="{Binding Source={x:Static properties:Settings.Default}, Path=SomeColor, Mode=TwoWay}" ... />

更多信息可以在这里和这里找到。

最新更新