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  • [WPF 学习] 14.PlaceHolder的简单实现

    为了能实现PlaceHolder的效果,用[https://www.cnblogs.com/catzhou/p/12658478.html]([WPF 学习] 12.动态绑定VisualBrush)的方式,实在是十分麻烦,要为每个文本框都折腾一把,实在不爽。现在介绍个简单的方法,借用Tag属性传递PlaceHolder的内容,代码如下:

        <Window.Resources>
            <system:String x:Key="PlaceHolderEn">English</system:String>
            <system:String x:Key="PlaceHolderCn">中文</system:String>
            <ControlTemplate x:Key="TextBoxTemplatePlaceHolder" TargetType="TextBox">
                <Border x:Name="border" Background="{TemplateBinding Background}" BorderThickness="{TemplateBinding BorderThickness}" BorderBrush="{TemplateBinding BorderBrush}" SnapsToDevicePixels="True" CornerRadius="15" Padding="5,0">
                    <Grid>
                        <ScrollViewer x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
                        <TextBlock x:Name="PlaceHolder" Text="{TemplateBinding Tag}" HorizontalAlignment="Center" VerticalAlignment="Center" Opacity="0" Background="Transparent"></TextBlock>
                    </Grid>
                </Border>
                <ControlTemplate.Triggers>
                    <Trigger  Property="Text" Value="">
                        <Setter TargetName="PlaceHolder" Property="Opacity" Value="0.3"></Setter>
                    </Trigger>
                </ControlTemplate.Triggers>
            </ControlTemplate>
        </Window.Resources>
        <StackPanel Name="abc">
            <TextBox FontSize="40" Text="" Tag="{DynamicResource PlaceHolderEn}"  Name="aaa" Template="{StaticResource TextBoxTemplatePlaceHolder}"/>
            <TextBox FontSize="40" Text="" Tag="{DynamicResource PlaceHolderCn}"   Template="{StaticResource TextBoxTemplatePlaceHolder}"/>
        </StackPanel>
    </Window>
    


    哦,顺便弄了个圆角,那叫一个方便,爽!

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  • 原文地址:https://www.cnblogs.com/catzhou/p/12744307.html
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