WPF PasswordBox 提示不起作用

Question

我正在尝试在 WPF 中设置 PasswordBox 的样式，以便它可以显示 Hint。 我通过在 ResourceDictionary 中使用以下代码来执行此操作：

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:BudgetBuddy.Styles">
    
    <Style x:Key="PBHintStyle" TargetType="{x:Type PasswordBox}">
        <Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/>
        <Setter Property="BorderBrush" Value="#FFABADB3"/>
        <Setter Property="Foreground" Value="{DynamicResource {x:Static SystemColors.ControlTextBrushKey}}"/>
        <Setter Property="BorderThickness" Value="1"/>
        <Setter Property="KeyboardNavigation.TabNavigation" Value="None"/>
        <Setter Property="HorizontalContentAlignment" Value="Left"/>
        <Setter Property="FocusVisualStyle" Value="{x:Null}"/>
        <Setter Property="AllowDrop" Value="True"/>
        <Setter Property="ScrollViewer.PanningMode" Value="VerticalFirst"/>
        <Setter Property="Stylus.IsFlicksEnabled" Value="False"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type PasswordBox}">
                    <Border 
                            x:Name="border" 
                            BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" 
                            SnapsToDevicePixels="True"
                            CornerRadius="4"
                            Padding="5 2 0 0">
                        <Grid>
                            <ScrollViewer x:Name="PART_ContentHost" Focusable="False" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
                            <TextBlock x:Name="WARKTEXT" Text="{TemplateBinding Tag}" Foreground="DimGray" Visibility="Collapsed" />
                        </Grid>
                    </Border>
                    <ControlTemplate.Triggers>
                        <Trigger Property="IsEnabled" Value="False">
                            <Setter Property="Opacity" TargetName="border" Value="0.56"/>
                        </Trigger>
                        <Trigger Property="IsMouseOver" Value="True">
                            <Setter Property="BorderBrush" TargetName="border" Value="#FF7EB4EA"/>
                        </Trigger>
                        <Trigger Property="IsKeyboardFocused" Value="True">
                            <Setter Property="BorderBrush" TargetName="border" Value="#FF569DE5"/>
                        </Trigger>
                        <MultiTrigger>
                            <MultiTrigger.Conditions>
                                <Condition Property="IsFocused" Value="False"/>
                            </MultiTrigger.Conditions>
                            <Setter Property="Visibility" TargetName="WARKTEXT" Value="Visible"/>
                        </MultiTrigger>
                    </ControlTemplate.Triggers>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <MultiTrigger>
                <MultiTrigger.Conditions>
                    <Condition Property="IsInactiveSelectionHighlightEnabled" Value="True"/>
                    <Condition Property="IsSelectionActive" Value="False"/>
                </MultiTrigger.Conditions>
                <Setter Property="SelectionBrush" Value="{DynamicResource {x:Static SystemColors.InactiveSelectionHighlightBrushKey}}"/>
            </MultiTrigger>
        </Style.Triggers>
    </Style>

</ResourceDictionary>

此代码有效，但有问题。它显示提示，将字符显示为密码字符，但问题是在字段中输入密码后，它会在密码字符上显示提示。

以下是部分截图：

问题来了：

我该如何解决这个问题？提前致谢。 :)

Answer 1

你可以试试这个：

<MultiTrigger>
    <MultiTrigger.Conditions>
        <Condition Property="IsFocused" Value="False"/>
        <Condition Property="Text" Value=""/>
    </MultiTrigger.Conditions>
    <Setter Property="Visibility" TargetName="WARKTEXT" Value="Visible"/>
</MultiTrigger>
<MultiTrigger>
    <MultiTrigger.Conditions>
        <Condition Property="IsFocused" Value="False"/>
        <Condition Property="Text" Value="{x:Null}"/>
    </MultiTrigger.Conditions>
    <Setter Property="Visibility" TargetName="WARKTEXT" Value="Visible"/>
</MultiTrigger>

如果文本不为空或不为空，将显示提示，否则不显示。

希望对你有所帮助。