订单分类显示 快递金额明细统计， 快递在线充值 等

29WxOrderWpf/UserControls/UcWaterMarkTextBox.xaml

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+<UserControl x:Class="_29WxOrderWpf.UserControls.UcWaterMarkTextBox"
+             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
+             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
+             xmlns:local="clr-namespace:_29WxOrderWpf.UserControls"
+             mc:Ignorable="d" 
+             d:DesignHeight="28" d:DesignWidth="100">
+    <UserControl.Resources>
+        <ResourceDictionary>
+            <local:WaterMarkVisibilityConverter x:Key="WaterMarkVisibility"/>
+        </ResourceDictionary>
+    </UserControl.Resources>
+    <Grid>
+        <TextBox x:Name="txt" Text="{Binding Text, Mode=TwoWay}" Style="{StaticResource BaseRoundCornerTextBoxStyle}" BorderBrush="{StaticResource pageColorBrush}" BorderThickness="1"
+                 HorizontalAlignment="Stretch" VerticalAlignment="Stretch" VerticalContentAlignment="Center" TextWrapping="{Binding TextWrapping}" TextChanged="txt_TextChanged"/>
+        <TextBlock x:Name="tbWaterMark" Text="{Binding WaterMark}" Margin="4,0,4,0" VerticalAlignment="Center" IsHitTestVisible="False" Foreground="DarkGray" 
+                   Visibility="{Binding ElementName=txt,Path=Text,Converter={StaticResource WaterMarkVisibility}}"></TextBlock>
+    </Grid>
+</UserControl>