c# - 样式化 WPF 密码框

Question

我目前正在尝试执行以下操作:如果未输入密码，则应显示文本“密码”。

但我的模板没有显示密码，如果我使用装饰器或滚动查看器，我无法更改文本的颜色。

你有什么想法来实现这个目标吗？

这是我的样式代码:

<Style TargetType="{x:Type PasswordBox}" x:Key="Password">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="PasswordBox">
                    <Grid>
                        <PasswordBox Background="{StaticResource BrushDark}" Foreground="{StaticResource BrushTextNormal}" BorderBrush="{StaticResource BrushBorderInput}" BorderThickness="1"/>
                        <TextBlock HorizontalAlignment="Left"
                            VerticalAlignment="Center"
                            Text="Password"
                            Margin="5,0,5,0"
                            Foreground="#ff808080"
                            IsHitTestVisible="False"
                            x:Name="UserMessage"
                            Visibility="Hidden"/>
                        <!--<ScrollViewer Foreground="{StaticResource BrushTextNormal}" Background="{StaticResource BrushTextNormal}" x:Name="PART_ContentHost"/>-->
                        <!--<Decorator TextBlock.Foreground="White" x:Name="PART_ContentHost"/>-->
                    </Grid>
                    <ControlTemplate.Triggers>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="Tag" Value=""/>
                                <Condition Property="IsKeyboardFocusWithin" Value="False"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Visibility" TargetName="UserMessage" Value="Visible"/>
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

Answer 1

如果您为 PasswordBox 或 TextBox 创建自定义 ControlTemplate，您需要将 ScrollViewer 命名为 x :Name="PART_ContentHost 而不是内部 PasswordBox

来自 PasswordBox Syles and Templates

PART_ContentHost - A visual element that can contain a FrameworkElement. The text of the PasswordBox is displayed in this element.

并将 Foreground 更改为 Style 中的另一个 Setter。此外，作为辅助节点，我会对 Background 执行相同的操作，并在您的 ControlTemplate 中使用 TemplateBinding。这将提供更大的灵 active ，并允许您手动更改 Background 和/或 Foreground 而无需更改 ControlTemplate

<Style TargetType="{x:Type PasswordBox}" x:Key="Password">
   <Setter Property="Foreground" Value="{StaticResource BrushTextNormal}" />
   <Setter Property="Background" Value="{StaticResource BrushDark}"/>
   <Setter Property="Template">
      <Setter.Value>
         <ControlTemplate TargetType="{x:Type PasswordBox}">
            <Grid Background="{TemplateBinding Background}">
               <ScrollViewer x:Name="PART_ContentHost" .../>
               <TextBlock .../>               
            </Grid>
            <ControlTemplate.Triggers>
               <!-- removed -->
            </ControlTemplate.Triggers>
         </ControlTemplate>
      </Setter.Value>
   </Setter>
</Style>