水印文本框
作者：互联网
原文:水印文本框
先看下效果：
流程：
1.新建WatermarkTextBox类，继承自TextBox。添加依赖项属性Watermark(水印)、WatermarkForeground(水印前景色)。
1 public class WatermarkTextBox : TextBox
2 {
3 #region DependencyProperties
4 public string Watermark
5 {
6 get { return (string)GetValue(WatermarkProperty); }
7 set { SetValue(WatermarkProperty, value); }
8 }
9
10 // Using a DependencyProperty as the backing store for Watermark. This enables animation, styling, binding, etc...
11 public static readonly DependencyProperty WatermarkProperty =
12 DependencyProperty.Register("Watermark", typeof(string), typeof(WatermarkTextBox), new PropertyMetadata(default(string)));
13
14 public Brush WatermarkForeground
15 {
16 get { return (Brush)GetValue(WatermarkForegroundProperty); }
17 set { SetValue(WatermarkForegroundProperty, value); }
18 }
19
20 // Using a DependencyProperty as the backing store for WatermarkForeground. This enables animation, styling, binding, etc...
21 public static readonly DependencyProperty WatermarkForegroundProperty =
22 DependencyProperty.Register("WatermarkForeground", typeof(Brush), typeof(WatermarkTextBox), new PropertyMetadata(new SolidColorBrush(Colors.Gray)));
23
24 #endregion
25
26 static WatermarkTextBox()
27 {
28 DefaultStyleKeyProperty.OverrideMetadata(typeof(WatermarkTextBox), new FrameworkPropertyMetadata(typeof(WatermarkTextBox)));
29 }
30 }
2.编写WatermarkTextBox样式。
1 <Style x:Key="WatermarkTextBoxStyle" TargetType="{x:Type local:WatermarkTextBox}">
2 <Setter Property="SnapsToDevicePixels" Value="True" />
3 <Setter Property="HorizontalContentAlignment" Value="Left" />
4 <Setter Property="VerticalContentAlignment" Value="Center" />
5 <Setter Property="BorderThickness" Value="1" />
6 <Setter Property="BorderBrush" Value="Black" />
7 <Setter Property="Padding" Value="4,2" />
8 <Setter Property="Template">
9 <Setter.Value>
10 <ControlTemplate TargetType="{x:Type local:WatermarkTextBox}">
11 <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" SnapsToDevicePixels="{TemplateBinding SnapsToDevicePixels}">
12 <Grid>
13 <ScrollViewer Name="PART_ContentHost" Focusable="False" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden" />
14 <TextBlock x:Name="PART_Watermark"
15 Margin="{TemplateBinding Padding}"
16 HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
17 VerticalAlignment="{TemplateBinding VerticalContentAlignment}"
18 FontFamily="{TemplateBinding FontFamily}"
19 FontSize="{TemplateBinding FontSize}"
20 FontWeight="{TemplateBinding FontWeight}"
21 Foreground="{TemplateBinding WatermarkForeground}"
22 Text="{TemplateBinding Watermark}"
23 Visibility="Collapsed" />
24 </Grid>
25 </Border>
26 <ControlTemplate.Triggers>
27 <MultiTrigger>
28 <MultiTrigger.Conditions>
29 <Condition Property="IsFocused" Value="False" />
30 <Condition Property="Text" Value="" />
31 </MultiTrigger.Conditions>
32 <Setter TargetName="PART_Watermark" Property="Visibility" Value="Visible" />
33 </MultiTrigger>
34 <Trigger Property="IsMouseOver" Value="True">
35 <Setter Property="BorderBrush" Value="#FF7EB4EA" />
36 </Trigger>
37 <Trigger Property="IsKeyboardFocused" Value="True">
38 <Setter Property="BorderBrush" Value="#FF569DE5" />
39 </Trigger>
40 <Trigger Property="IsEnabled" Value="False">
41 <Setter Property="Opacity" Value="0.56" />
42 </Trigger>
43 </ControlTemplate.Triggers>
44 </ControlTemplate>
45 </Setter.Value>
46 </Setter>
47 </Style>
3.界面引用。
1 <StackPanel HorizontalAlignment="Center" VerticalAlignment="Center" Orientation="Horizontal">
2 <local:WatermarkTextBox x:Name="txt"
3 Width="200" Height="28"
4 Style="{StaticResource WatermarkTextBoxStyle}"
5 Watermark="请输入..." />
6 <Button Width="60" Height="28"
7 Margin="10,0,0,0"
8 Click="BtnConfirm_Click" Content="确定" />
9 </StackPanel>
标签：string,DependencyProperty,WatermarkTextBox,水印,文本框,new,public,typeof 来源： https://www.cnblogs.com/lonelyxmas/p/11980162.html