wpf触发器的优先级是怎么回事？

Question

这段代码，IsPressed被IsFocused覆盖了。当不设置IsFocused的时候，按按钮就没问题，当设置了IsFocused的时候，IsPressed就没法触发了。请问这个该如何解决？<Trigger SourceName="btnHead" Property="IsPressed" Value="True">
                    <Setter TargetName="itemBackground" Property="Background" Value="#92C0E0"/>
                    <Setter TargetName="itemBackground" Property="BorderBrush" Value="#92C0E0"/>
                </Trigger>
                <Trigger SourceName="btnHead" Property="IsFocused" Value="True">
                    <Setter TargetName="itemBackground" Property="Background" Value="#E6F2FA"/>
                    <Setter TargetName="itemBackground" Property="BorderBrush" Value="#B1D6F0"/>
                </Trigger>
                <Trigger SourceName="btnHead" Property="IsMouseOver" Value="True">
                    <Setter TargetName="itemBackground" Property="Background" Value="#CDE6F7"/>
                    <Setter TargetName="itemBackground" Property="BorderBrush" Value="#CDE6F7"/>
                </Trigger>

Answer 1

补充一下，点击按钮的时候，它不变色，也不知道IsPressed到底触发过没有。

Answer 2

这个是事件触发顺序的问题的，同时定义两个IsPressed其实是触发了的，只是IsPressed触发时设置的颜色又被IsFocused事件触发时修改过来了，因为IsPressed事件发生在IsFocused事件之前，具体可以参考MSDN焦点的介绍：
http://msdn.microsoft.com/zh-cn/library/vstudio/aa969768.aspx

Answer 3

问题是我现在需要在focused状态下一种背景色，然后pressed按下的时候还要改变一下背景色，这个在xaml里面应该如何处理呢？是不是不能处理？

Answer 4

  <ControlTemplate x:Key="MenubuttonTemplate" TargetType="{x:Type Button}">
            <Grid>
                <Rectangle x:Name="outRect" Fill="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                 Path=Background }" Visibility="Visible">
                </Rectangle>
                <TextBlock HorizontalAlignment="Center" VerticalAlignment="Center" Margin="{TemplateBinding Padding}" Text="{TemplateBinding Content}"
                           FontFamily="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                 Path=FontFamily }"
                FontSize="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                 Path=FontSize }"  />
                <Path  x:Name="BorderPath" Stroke="{Binding RelativeSource={RelativeSource TemplatedParent}, 
                                 Path=BorderBrush }" StrokeThickness="1" >
                    <Path.Data>
                        <PathGeometry>
                            <PathFigure StartPoint="0,29">
                                <PathFigure.Segments  >
                                    <LineSegment   Point="0,0"/>
                                    <LineSegment   Point="82,0"/>
                                    <LineSegment   Point="82,29"/>
                                </PathFigure.Segments>
                            </PathFigure>
                        </PathGeometry>
                    </Path.Data>
                </Path>
            </Grid>
            <ControlTemplate.Triggers>
                <Trigger     Property="Button.IsPressed"     Value="True">
                    <Setter Property="Button.Background" Value="#92C0E0"/>
                    <Setter Property="Button.BorderBrush" Value="#92C0E0"/>
                </Trigger>
                <Trigger  Property="Button.IsFocused" Value="True">
                    <Setter  Property="Button.Background" Value="#E6F2FA"/>
                    <Setter  Property="Button.BorderBrush" Value="#B1D6F0"/>
                </Trigger>
                <Trigger  Property="Button.IsMouseOver" Value="True">
                    <Setter  Property="Button.Background" Value="#CDE6F7"/>
                    <Setter Property="Button.BorderBrush" Value="#CDE6F7"/>
                </Trigger>
            </ControlTemplate.Triggers>
        </ControlTemplate>

Answer 5

        <Button  HorizontalAlignment="Left"  Template="{StaticResource MenubuttonTemplate}"  Content="确定"     Margin="28,211,0,0" Name="button1" VerticalAlignment="Top"    FontSize="14" Click="button1_Click" />

Answer 6

问题是我现在需要在focused状态下一种背景色，然后pressed按下的时候还要改变一下背景色，这个在xaml里面应该如何处理呢？是不是不能处理？
那可以用代码来设置下的，在键盘按下事件中注销掉获取焦点事件，设置颜色完之后在注册获取焦点事件