1.首先进行 转换器操作(获取当前Textbox Text是否为空或者空格)
/
// <summary>/// 非空验证转换器/// </summary>#region String IsNullOrEmptypublic class IsNullOrEmptyConverter : IValueConverter{public object Convert(object value, Type targetType, object parameter, CultureInfo culture){return string.IsNullOrEmpty((string)value);}public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture){return DependencyProperty.UnsetValue;}}#endregion
2.设置附加属性给Textbox
public class TextBoxHelper{#region Watermarkpublic static string GetWatermark(DependencyObject obj){return (string)obj.GetValue(WatermarkProperty);}public static void SetWatermark(DependencyObject obj, string value){obj.SetValue(WatermarkProperty, value);}public static readonly DependencyProperty WatermarkProperty =DependencyProperty.RegisterAttached("Watermark", typeof(string), typeof(TextBoxHelper));#endregion}
3,设定样式:
<Style x:Key="HelperTextWaterCanEdit" TargetType="{x:Type TextBox}"><Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/><Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/><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 TextBox}"><Border x:Name="BackBorder" SnapsToDevicePixels="true" Width="{TemplateBinding Width}" Height="{TemplateBinding Height}" VerticalAlignment="{TemplateBinding VerticalAlignment}" HorizontalAlignment="{TemplateBinding HorizontalAlignment}" Background="{TemplateBinding Background}" CornerRadius="5" BorderThickness="{TemplateBinding BorderThickness}" Tag="{TemplateBinding Tag}" BorderBrush="{TemplateBinding BorderBrush}"><Grid><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="35"/></Grid.ColumnDefinitions><ScrollViewer Grid.Column="0" x:Name="PART_ContentHost" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}"/><TextBlock x:Name="tbWatermark"Grid.Column="0"Padding="2,0"Margin="{TemplateBinding Padding}"Foreground="{TemplateBinding Foreground}"FontSize="{TemplateBinding FontSize}"TextWrapping="Wrap"Focusable="False"IsHitTestVisible="False"Visibility="Collapsed"Text="{Binding Path=(local:TextBoxHelper.Watermark),RelativeSource={RelativeSource AncestorType=TextBox}, Mode=OneWay}"VerticalAlignment="Center"HorizontalAlignment="Left"Opacity="0.5" /><TextBlock Name="Danwei" Grid.Column="1" Text="{Binding Tag, RelativeSource={RelativeSource AncestorType=TextBox, Mode=FindAncestor}}" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0,0,5,0"/> </Grid></Border><ControlTemplate.Triggers><DataTrigger Binding="{Binding Text,RelativeSource={RelativeSource Self},Converter={StaticResource IsNullOrEmptyConverter }}" Value="True"><Setter Property="Visibility" TargetName="tbWatermark" Value="Visible" /></DataTrigger></ControlTemplate.Triggers></ControlTemplate></Setter.Value></Setter></Style>
其中有个需要设定 附件属性的地方就是(本次我们把操作类放在同一个文件夹所以使用Local 就可以找到对应的属性):
Text="{Binding Path=(local:TextBoxHelper.Watermark),RelativeSource={RelativeSource AncestorType=TextBox}, Mode=OneWay}"
但是因为转换类是在其他方法内,所以此地需要引入操作
<DataTrigger Binding="{Binding Text,RelativeSource={RelativeSource Self},Converter={StaticResource IsNullOrEmptyConverter }}" Value="True">
引入的写法和xaml标准方法: 引入地址
xmlns:local1="clr-namespace:海王牌位系统.CommonInMy.Converter">
设定本地读取key
<local1:IsNullOrEmptyConverter x:Key="IsNullOrEmptyConverter"/>
4 应用在界面的xaml下的操作:引入Key
<Window.Resources><ResourceDictionary><ResourceDictionary.MergedDictionaries><ResourceDictionary Source="../CommonInMy/Styles/TextBoxStyle.xaml"></ResourceDictionary></ResourceDictionary.MergedDictionaries></ResourceDictionary></Window.Resources>
当然也要引用附加属性所在地址:
xmlns:Local1="clr-namespace:海王牌位系统.CommonInMy.Styles"
使用在textbox下的操作:
<TextBox Name="GetText" Width="200" Tag="Kg" Height="30" Style="{DynamicResource HelperTextWaterCanEdit}" Local1:TextBoxHelper.Watermark="你觉得好吗" ></TextBox>
其中水印 就是附加属性 设定的text ,Tag则单位的显示数据。
效果如下:使用text 读出来的实际就是textbox里的值
使用附加属性操作水印建议推荐先拜读这篇文章
https://blog.csdn.net/qq_39488878/article/details/126251868
使用圆角以及水印加入单位推荐拜读这个
https://cloud.tencent.com/developer/article/1513535
其中原来的样式是粘贴下直接可以使用,确定就是水印不能自己随意修改:
<SolidColorBrush x:Key="TextBox.Static.Border" Color="#FFABAdB3"/><SolidColorBrush x:Key="TextBox.MouseOver.Border" Color="#FF7EB4EA"/><SolidColorBrush x:Key="TextBox.Focus.Border" Color="#FF569DE5"/><VisualBrush x:Key="HintText" TileMode="None" Opacity="0.5" Stretch="None" AlignmentX="Left"><VisualBrush.Visual><TextBlock FontStyle="Italic" Text="请输入数据"/></VisualBrush.Visual></VisualBrush><Style x:Key="TBoxLightWatermarkWithUnit" TargetType="{x:Type TextBox}"><Setter Property="Background" Value="{DynamicResource {x:Static SystemColors.WindowBrushKey}}"/><Setter Property="BorderBrush" Value="{StaticResource TextBox.Static.Border}"/><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 TextBox}"><Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True"CornerRadius="2"><Grid><Grid.ColumnDefinitions><ColumnDefinition Width="*"/><ColumnDefinition Width="35"/></Grid.ColumnDefinitions><ScrollViewer Grid.Column="0" x:Name="PART_ContentHost" Focusable="false" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/><TextBlock Grid.Column="1" Text="mm" VerticalAlignment="Center" Margin="0,0,5,0"/></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="{StaticResource TextBox.MouseOver.Border}"/></Trigger><Trigger Property="IsKeyboardFocused" Value="true"><Setter Property="BorderBrush" TargetName="border" Value="{StaticResource TextBox.Focus.Border}"/></Trigger></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><Trigger Property="Text" Value="{x:Null}"><Setter Property="Background" Value="{StaticResource HintText}"/></Trigger><Trigger Property="Text" Value=""><Setter Property="Background" Value="{StaticResource HintText}"/></Trigger></Style.Triggers></Style>