Question

我有一张图像，我用作按钮的背景。如果按钮被禁用，我希望它是某种颜色，在这种情况下，＃FFCCCCCC，但是当它启用时，我希望它使用图像作为背景。这可能吗？我正在修改Expression Blend中的模板，但我找不到合适的组合。似乎按钮具有图像背景或颜色背景，但不能根据状态改变。

我正在使用Windows Phone 7 / Silverlight。

我的XAML如下：

    <Style x:Key="SiteKeyButtonStyle" TargetType="Button">
        <Setter Property="VerticalAlignment" Value="Top" />
        <Setter Property="HorizontalAlignment" Value="Center" />
        <Setter Property="FontFamily" Value="{StaticResource PhoneFontFamilyNormal}" />
        <Setter Property="FontSize" Value="24" />
        <Setter Property="Foreground" Value="#FFFFFF" />
        <Setter Property="BorderThickness" Value="0" />
        <Setter Property="MinWidth" Value="140" />
        <Setter Property="Height" Value="50" />
        <Setter Property="Padding" Value="24, 0, 24, 0" />
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="Button">
                    <Grid Background="Transparent">
                        <VisualStateManager.VisualStateGroups>
                            <VisualStateGroup x:Name="CommonStates">
                                <VisualState x:Name="Normal"/>
                                <VisualState x:Name="MouseOver"/>
                                <VisualState x:Name="Pressed">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentContainer" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneBackgroundBrush}" />
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="BorderBrush">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneForegroundBrush}" />
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation Duration="0" To="0.6" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="ButtonBackground" />
                                    </Storyboard>
                                </VisualState>
                                <VisualState x:Name="Disabled">
                                    <Storyboard>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ContentContainer" Storyboard.TargetProperty="Foreground">
                                            <DiscreteObjectKeyFrame KeyTime="0" Value="{StaticResource PhoneDisabledBrush}" />
                                        </ObjectAnimationUsingKeyFrames>
                                        <ObjectAnimationUsingKeyFrames Storyboard.TargetName="ButtonBackground" Storyboard.TargetProperty="BorderBrush">
                                            <DiscreteObjectKeyFrame KeyTime="0" >
                                                <DiscreteObjectKeyFrame.Value>
                                                    <SolidColorBrush Color="#FFCCCCCC"/>
                                                </DiscreteObjectKeyFrame.Value>
                                            </DiscreteObjectKeyFrame>
                                        </ObjectAnimationUsingKeyFrames>
                                        <DoubleAnimation Duration="0" Storyboard.TargetProperty="(UIElement.Opacity)" Storyboard.TargetName="ButtonBackground" To="1" />
                                    </Storyboard>
                                </VisualState>
                            </VisualStateGroup>
                        </VisualStateManager.VisualStateGroups>
                        <Border x:Name="ButtonBackground" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="0" >
                            <Border.Background>
                                <ImageBrush ImageSource="/ProjectName;component/Images/Icons/button-background.png" Stretch="Fill"/>
                            </Border.Background>
                            <ContentControl x:Name="ContentContainer" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                        </Border>
                    </Grid>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Answer 1

这种方法的典型方法是在核心设计中添加Rectangle元素，如下所示： -

                    <Border x:Name="ButtonBackground" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" CornerRadius="0" >
                         <Rectangle x:Name="BackgroundElement">
                             <Rectangle.Fill>
                                 <ImageBrush ImageSource="/ProjectName;component/Images/Icons/button-background.png" Stretch="Fill"/>
                             </Rectangle.Fill>
                         </Rectangle>
                         <ContentControl x:Name="ContentContainer" Foreground="{TemplateBinding Foreground}" HorizontalContentAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalContentAlignment="{TemplateBinding VerticalContentAlignment}" Padding="{TemplateBinding Padding}" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}"/>
                     </Border>

您现在可以更改Disabled VisualState，使背景不透明但#FFCCCCCC。同时添加DoubleAnimation，在“禁用”和“按下”状态下将“BackgroundElement”的Opacity设置为0。

因此，当启用时，矩形中的图像会看到内容容器中的任何内容。禁用时，图像是透明的，可以看到#FFCCCCCC颜色。按下时，会看到PhoneForegroundBrush颜色。

Answer 2

你可以在触发器中更改整个controltemplate，这样就可以了。我没有对此进行测试，但希望它会让你知道如何做到这一点。

 <Style TargetType="{x:Type Button}">
     <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="{x:Type Button}">

                    </ControlTemplate>
                </Setter.Value>
            </Setter>
     <Style.Triggers>
                <Trigger Property="IsEnabled" Value="False">
                    <ControlTemplate TargetType="{x:Type Button}">

                    </ControlTemplate>
                </Trigger>
     </Style.Trigger>
    </Style>

根据XAML中的状态，将图像和颜色交替为按钮背景

2 个答案: