XAML 文本框在焦点上更改边框颜色

Question

问题

---

我目前遇到的问题是，在“IsFocused”属性上，我能够触发文本框的背景更改，但是当我想更改 BorderBrush 时它不起作用。

            <TextBox Padding="2" FontFamily="Sans Serif" Foreground="Red" FontSize="10px" FontWeight="Medium" Width="200" BorderThickness="2" VerticalAlignment="Center">
            <TextBox.Resources>
                <Style TargetType="{x:Type Border}">
                    <Setter Property="CornerRadius" Value="2"/>
                </Style>
            </TextBox.Resources>
            <TextBox.Style>
                <Style TargetType="{x:Type TextBox}">
                    <Setter Property="BorderBrush" Value="#858585"/>
                    <Style.Triggers>
                        <Trigger Property="IsFocused" Value="True">
                            <Setter Property="BorderBrush" Value="Red" />
                        </Trigger>
                    </Style.Triggers>
                </Style>
            </TextBox.Style>
        </TextBox>

谁能看出这行不通的原因？

编辑

我刚刚发现当我“右键单击”时它会变成红色？当用户单击文本框时，我希望它变为红色。

Answer 1

尝试使用该代码

        <TextBox 

                 Padding="2"  FontFamily="Sans Serif" 
                 Foreground="Red" FontSize="10px"
                 FontWeight="Medium" Width="200"  
                 VerticalAlignment="Center">


            <TextBox.Style>

                <Style BasedOn="{x:Null}" TargetType="{x:Type TextBox}">
                    <Setter Property="BorderThickness" Value="2"/>
                    <Setter Property="Padding" Value="1"/>
                    <Setter Property="AllowDrop" Value="true"/>
                    <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
                    <Setter Property="Template">
                        <Setter.Value>
                            <ControlTemplate TargetType="{x:Type TextBox}">
                                <Border x:Name="bg" BorderBrush="#FF825E5E" BorderThickness="1">
                                    <ScrollViewer x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/>
                                </Border>
                                <ControlTemplate.Triggers>

                                    <Trigger Property="IsMouseOver" Value="True">
                                        <Setter Property="BorderBrush" TargetName="bg" Value="Red"/>
                                        <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                                    </Trigger>

                                    <Trigger Property="IsFocused" Value="True">
                                        <Setter Property="BorderBrush" TargetName="bg" Value="Red"/>
                                        <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                                    </Trigger>


                                    <Trigger Property="IsFocused" Value="False">
                                        <Setter Property="BorderBrush" TargetName="bg" Value="#858585"/>
                                        <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                                    </Trigger>

                                    <Trigger Property="IsMouseOver" Value="False">
                                        <Setter Property="BorderBrush" TargetName="bg" Value="#858585"/>
                                        <Setter Property="BorderThickness" TargetName="bg" Value="2"/>
                                    </Trigger>

                                </ControlTemplate.Triggers>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>

            </TextBox.Style>
       </TextBox>