WPF 自定义按钮外形

WPF的按钮提供了Template模板，可以通过修改Template模板中的内容对按钮的样式进行自定义，完整代码Github自取。

使用Style定义扁平化的按钮样式

定义一个ButtonStyleDictonary.xaml资源字典文件，在Control Template中定义一个带Border的按钮，然后定义Trigger作为改变样式的触发器

<Style x:Key="FlatButtonStyle" TargetType="Button">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Border x:Name="border" Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}"
                        SnapsToDevicePixels="True">
                    <TextBlock Text="{TemplateBinding Content}"
                                Foreground="{TemplateBinding Foreground}"
                                VerticalAlignment="Center" 
                                HorizontalAlignment="Center"/>
                </Border>

                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter TargetName="border" Property="Background" Value="#2f96b4"/>
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                        <Setter TargetName="border" Property="Background" Value="red"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

WPF中使用ResourceDictonary 资源字典

引入在资源字典文件中定义公共的Template，然后在xaml窗口、自定义控件或者整个App当中调用

<Window.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <ResourceDictionary Source="ButtonStyleDictonary.xaml"></ResourceDictionary>
        </ResourceDictionary.MergedDictionaries>
    </ResourceDictionary>
</Window.Resources>

然后就可以在窗体的xaml中应用刚才定义的属性了

<Button Style="{StaticResource FlatButtonStyle}" Width="64" Height="28">
     Hello
</Button>

使用Style和Polygon自定义Button的外形

<Style x:Key="ArrowButtonStyle" TargetType="Button">
    <Setter Property="Template">
        <Setter.Value>
            <ControlTemplate TargetType="Button">
                <Polygon x:Name="border" Fill="{TemplateBinding Background}"
                            Points="0,0 2,0 1,1" Stroke="Black" StrokeThickness="2"
                            SnapsToDevicePixels="True"
                            Stretch="Uniform"/>

                <ControlTemplate.Triggers>
                    <Trigger Property="IsMouseOver" Value="True">
                        <Setter TargetName="border" Property="Fill" Value="gray"/>
                    </Trigger>
                    <Trigger Property="IsPressed" Value="True">
                        <Setter TargetName="border" Property="Fill" Value="red"/>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Setter.Value>
    </Setter>
</Style>

效果如下