[Silverlight] Mac OS 風格按鈕 Style 實現的更新版（針對 Silverlight 2 RTW)

在 Silverlight 2 beta 2 時，我曾經寫了一篇帖子實現了蘋果風格的按鈕樣式（Silverlight 下蘋果(Mac OS)風格按鈕的實現 ）。

而現在 Silverlight 2 終於發佈了，也給之前的代碼帶來了很多問題，導致無法繼續使用。

經過一陣探索，我終於成功修改了這個代碼，現在在正式版下也能工作正常了。其關鍵點如下：

1. 在 beta 2 時，需要採用 <vsm:Setter> 和 <vsm:Style> 的語法編寫樣式。其中 vsm 是個名稱空間引用：
xmlns:vsm="clr-namespace:System.Windows;assembly=System.Windows"
而正式版下直接用 <Style> 和 <Setter> 表籤即可。
這個問題如果不修改，程序可以編譯通過，但是運行時會報一個莫名其妙的“AG_E_PARSER_PROPERTY_NOT_FOUND”錯誤。

2. ContentPresenter 和 ContentControl 控件刪除了如下屬性：
TextDecorations,
TextWrapping,
TextAlignment.

因此，現在必須在 template 中將 ContentPresenter 的定位改用容器 Button 的 HorizontalContentAlignment 和 VerticalContentAlignment 屬性來控制。代碼如下：

<ContentPresenter Margin="4,5,4,4" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />

修改成功後的 Style 全部代碼如下：

<UserControl
    x:Class="UserControl"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"
    d:DesignWidth="640" d:DesignHeight="480">

    <UserControl.Resources>
        <Style x:Key="MyButton" TargetType="Button">
            <Setter Property="IsEnabled" Value="true"/>
            <Setter Property="IsTabStop" Value="true"/>
            <Setter Property="Background" Value="#FF003255"/>
            <Setter Property="Foreground" Value="#FF313131"/>
            <Setter Property="MinWidth" Value="5"/>
            <Setter Property="MinHeight" Value="5"/>
            <Setter Property="Margin" Value="0"/>
            <Setter Property="HorizontalContentAlignment" Value="Center"/>
            <Setter Property="VerticalContentAlignment" Value="Center"/>
            <Setter Property="Cursor" Value="Arrow"/>
            <Setter Property="FontSize" Value="11" />
            <Setter Property="Template">
                <Setter.Value>
                    <ControlTemplate TargetType="Button">
                        <Grid>
                            <Grid.Resources>
                                <Color x:Key="LinearBevelLightStartColor">#FFFFFFFF</Color>
                                <Color x:Key="LinearBevelLightEndColor">#F4E2E0E0</Color>
                                <Color x:Key="LinearBevelDarkStartColor">#E0E5E5E5</Color>
                                <Color x:Key="LinearBevelDarkEndColor">#B2FFFFFF</Color>
                                <Color x:Key="MouseOverLinearBevelDarkEndColor">#7FFC1717</Color>
                                <Color x:Key="HoverLinearBevelLightStartColor">#FCFFFFFF</Color>
                                <Color x:Key="HoverLinearBevelLightEndColor">#EAFFFFFF</Color>
                                <Color x:Key="HoverLinearBevelDarkStartColor">#D8FFFFFF</Color>
                                <Color x:Key="HoverLinearBevelDarkEndColor">#4CFFFFFF</Color>
                                <Color x:Key="CurvedBevelFillStartColor">#B3FFFFFF</Color>
                                <Color x:Key="CurvedBevelFillEndColor">#3CFFFFFF</Color>
                                <SolidColorBrush x:Key="BorderBrush" Color="#FF5E5E5E"/>
                                <SolidColorBrush x:Key="AccentBrush" Color="#FF000000"/>
                                <SolidColorBrush x:Key="DisabledBrush" Color="#A5FFFFFF"/>
                                <LinearGradientBrush x:Key="FocusedStrokeBrush" EndPoint="0.5,1" StartPoint="0.5,0">
                                    <GradientStop Color="#B2FFFFFF" Offset="0"/>
                                    <GradientStop Color="#51FFFFFF" Offset="1"/>
                                    <GradientStop Color="#66FFFFFF" Offset="0.325"/>
                                    <GradientStop Color="#1EFFFFFF" Offset="0.325"/>
                                </LinearGradientBrush>
                            </Grid.Resources>
                            <VisualStateManager.VisualStateGroups>
                                <VisualStateGroup x:Name="CommonStates">
                                    <VisualStateGroup.Transitions>
                                        <VisualTransition GeneratedDuration="00:00:00.2000000" To="MouseOver"/>
                                        <VisualTransition GeneratedDuration="0:0:0.1" To="Pressed"/>
                                        <VisualTransition GeneratedDuration="00:00:00.2000000" From="Normal" To="MouseOver"/>
                                    </VisualStateGroup.Transitions>
                                    <VisualState x:Name="Normal">
                                        <Storyboard/>
                                    </VisualState>
                                    <VisualState x:Name="MouseOver">
                                        <Storyboard>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#c8d5ed" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#97c2ee" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#6eadee" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#aff9ff" />
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Pressed">
                                        <Storyboard>
                                            <DoubleAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="BackgroundGradient" Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Offset)">
                                                <SplineDoubleKeyFrame KeyTime="0" Value=".2"/>
                                            </DoubleAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[0].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#bac5e8" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[1].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#7bb2e9" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[2].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#4d9ae7" />
                                            </ColorAnimationUsingKeyFrames>
                                            <ColorAnimationUsingKeyFrames 
                                                Duration="0" 
                                                Storyboard.TargetName="BackgroundGradient" 
                                                Storyboard.TargetProperty="(Shape.Fill).(GradientBrush.GradientStops)[3].(GradientStop.Color)">
                                                <SplineColorKeyFrame KeyTime="0" Value="#85eaff" />
                                            </ColorAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Disabled">
                                        <Storyboard>
                                            <DoubleAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="DisabledVisual" Storyboard.TargetProperty="Opacity">
                                                <SplineDoubleKeyFrame KeyTime="0" Value="1"/>
                                            </DoubleAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                </VisualStateGroup>
                                <VisualStateGroup x:Name="FocusStates">
                                    <VisualState x:Name="Focused">
                                        <Storyboard>
                                            <ObjectAnimationUsingKeyFrames Duration="0" Storyboard.TargetName="FocusVisual" Storyboard.TargetProperty="Visibility">
                                                <DiscreteObjectKeyFrame KeyTime="0">
                                                    <DiscreteObjectKeyFrame.Value>
                                                        <Visibility>Visible</Visibility>
                                                    </DiscreteObjectKeyFrame.Value>
                                                </DiscreteObjectKeyFrame>
                                            </ObjectAnimationUsingKeyFrames>
                                        </Storyboard>
                                    </VisualState>
                                    <VisualState x:Name="Unfocused">
                                        <Storyboard/>
                                    </VisualState>
                                </VisualStateGroup>
                            </VisualStateManager.VisualStateGroups>
                            <Rectangle x:Name="Background" Fill="{TemplateBinding Background}" RadiusX="11" RadiusY="11"/>
                            <Rectangle x:Name="BackgroundGradient" Stroke="{StaticResource BorderBrush}" StrokeThickness="1" RadiusX="11" RadiusY="11" Margin="-1,-1,-1,-1">
                                <Rectangle.Fill>
                                    <LinearGradientBrush EndPoint="0.7,1" StartPoint="0.7,0">
                                        <GradientStop Color="{StaticResource LinearBevelLightStartColor}" Offset="0"/>
                                        <GradientStop Color="{StaticResource LinearBevelLightEndColor}" Offset="0.326"/>
                                        <GradientStop Color="{StaticResource LinearBevelDarkStartColor}" Offset="0.344"/>
                                        <GradientStop Color="#FFFFFFFF" Offset="0.786"/>
                                    </LinearGradientBrush>
                                </Rectangle.Fill>
                            </Rectangle>
                            <Grid x:Name="FocusVisual" Visibility="Collapsed">
                                <Rectangle Margin="-2,1,-2,-2" Stroke="{StaticResource AccentBrush}" StrokeThickness="1" StrokeDashArray="1.5 1.5" RadiusX="3" RadiusY="3" />
                            </Grid>
                            <ContentPresenter Margin="4,5,4,4" Content="{TemplateBinding Content}" ContentTemplate="{TemplateBinding ContentTemplate}" HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}" VerticalAlignment="{TemplateBinding VerticalContentAlignment}" />
                            <Rectangle x:Name="DisabledVisual" IsHitTestVisible="false" Opacity="0" Fill="{StaticResource DisabledBrush}" RadiusX="11" RadiusY="11" Margin="-1,-1,-1,-1"/>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
        </Style>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot" Background="White" >
        <Button Height="35" HorizontalAlignment="Stretch" Margin="198,132,262,0" Style="{StaticResource MyButton}" VerticalAlignment="Top" Content="Button"/>
    </Grid>
</UserControl>

over.