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WPF 水印装饰器

使用AdornerDecorator装饰器实现WPF水印

水印装饰器WatermarkAdorner类代码:

WPF 水印装饰器WPF 水印装饰器

using System; using System.Collections.Generic; using System.Globalization; using System.Linq; using System.Text; using System.Text.RegularExpressions; using System.Threading.Tasks; using System.Windows; using System.Windows.Documents; using System.Windows.Media;  namespace WPF水印装饰器 {     /// <summary>     /// 水印装饰器     /// </summary>     public class WatermarkAdorner : Adorner     {         private string _watermarkText;          public WatermarkAdorner(UIElement adornedElement, string watermarkText) : base(adornedElement)         {             _watermarkText = watermarkText;             this.IsHitTestVisible = false; //使水印不捕获事件         }          protected override void OnRender(DrawingContext drawingContext)         {             Rect rect = new Rect(this.AdornedElement.RenderSize);             double centerX = rect.Right / 2.0;             double centerY = rect.Bottom / 2.0;              drawingContext.PushOpacity(0.5);             RotateTransform rotateTransform = new RotateTransform(45, centerX, centerY);             drawingContext.PushTransform(rotateTransform);              RotateTransform rt = new RotateTransform(-45, centerX, centerY);             Point point = default(Point);             double n = 5.0;             double margin = 40;             double halfWidth = GetTextLength(_watermarkText) * 10 / 2.0;              //第1排3个             point = RotatePoint(0.5, 0.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(2.5, 0.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(4.5, 0.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);              //第2排2个             point = RotatePoint(1.5, 1.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(3.5, 1.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);              //第3排3个             point = RotatePoint(0.5, 2.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(2.5, 2.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(4.5, 2.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);              //第4排2个             point = RotatePoint(1.5, 3.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(3.5, 3.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);              //第5排3个             point = RotatePoint(0.5, 4.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(2.5, 4.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);             point = RotatePoint(4.5, 4.5, n, rt, rect, margin);             DrawText(point.X, point.Y, halfWidth, drawingContext, _watermarkText);          }          private void DrawText(double x, double y, double textHalfWidth, DrawingContext drawingContext, string text)         {             int fontSize = 20;             SolidColorBrush colorBrush = new SolidColorBrush((Color)ColorConverter.ConvertFromString("#eeeef2"));             Point point = new Point(x - textHalfWidth, y - fontSize / 2.0);             FormattedText formattedText = new FormattedText(text, CultureInfo.CurrentCulture, FlowDirection.LeftToRight, new Typeface("宋体"), fontSize, colorBrush);             drawingContext.DrawText(formattedText, point);         }          /// <summary>         /// 旋转Point         /// </summary>         /// <param name="ratioX">文本中心点占区域宽度n等分的比例</param>         /// <param name="ratioY">文本中心点占区域长度n等分的比例</param>         /// <param name="n">区域长宽n等分</param>         /// <param name="rotateTransform">旋转对象</param>         /// <param name="rect">区域</param>         /// <param name="margin">Margin</param>         private Point RotatePoint(double ratioX, double ratioY, double n, RotateTransform rotateTransform, Rect rect, double margin)         {             return rotateTransform.Transform(new Point(ratioX / n * rect.Right, ratioY / n * (rect.Bottom - 2 * margin) + margin));         }          #region 计算文本长度(汉字计为2 大写字母计为1.5 小写字母计为1)         /// <summary>         /// 计算文本长度(汉字计为2 大写字母计为1.5 小写字母计为1)         /// </summary>         private double GetTextLength(string text)         {             double length = 0;              Regex reg1 = new Regex("[u4E00-u9FFF]|[uFE30-uFFA0]");             Regex reg2 = new Regex("[A-Z]");              foreach (char c in text)             {                 if (reg1.IsMatch(c.ToString()))                 {                     length += 2;                 }                 else if (reg2.IsMatch(c.ToString()))                 {                     length += 1.5;                 }                 else                 {                     length += 1;                 }             }              return length;         }         #endregion      } }

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如何使用:

在窗体或控件的Loaded方法中,添加如下代码:

WPF 水印装饰器WPF 水印装饰器

UIElement uiElement = (UIElement)this.Content; AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(uiElement); adornerLayer.Add(new WatermarkAdorner(uiElement, _watermarkText));

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完整MainWindow.xaml代码:

WPF 水印装饰器WPF 水印装饰器

<Window x:Class="WPF水印装饰器.MainWindow"         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"         xmlns:local="clr-namespace:WPF水印装饰器"         mc:Ignorable="d"         Title="MainWindow" Height="1040" Width="1920" Loaded="Window_Loaded" WindowStyle="None"  ResizeMode="NoResize" WindowStartupLocation="CenterScreen" MouseRightButtonDown="Window_MouseRightButtonDown">     <Window.Template>         <ControlTemplate TargetType="{x:Type Window}">             <!-- ControlTemplate不包含AdornerDecorator,需要在ControlTemplate中添加AdornerDecorator -->             <AdornerDecorator>                 <ContentPresenter />             </AdornerDecorator>         </ControlTemplate>     </Window.Template>     <Window.Resources>         <ResourceDictionary>             <ControlTemplate x:Key="tmplBtn" TargetType="{x:Type Button}" >                 <Border x:Name="border" Background="#068d6b" CornerRadius="5">                     <TextBlock Text="{TemplateBinding Content}" Foreground="#ffffff" HorizontalAlignment="Center" VerticalAlignment="Center"></TextBlock>                 </Border>                 <ControlTemplate.Triggers>                     <Trigger Property="IsMouseOver" Value="true">                         <Setter TargetName="border" Property="Background" Value="#069d8b"></Setter>                     </Trigger>                 </ControlTemplate.Triggers>             </ControlTemplate>         </ResourceDictionary>     </Window.Resources>     <Grid x:Name="grid" Background="#094760">         <Button x:Name="button" Content="显示子窗体" Margin="0,0,0,0" Width="100" Height="35" Click="button_Click" Template="{StaticResource tmplBtn}"></Button>         <Button x:Name="button2" Content="显示子窗体2" Margin="0,100,0,0" Width="100" Height="35" Click="button2_Click" Template="{StaticResource tmplBtn}"></Button>     </Grid> </Window>

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注意:如果窗体或控件使用了ControlTemplate,因为ControlTemplate不包含AdornerDecorator,所以需要在ControlTemplate中添加AdornerDecorator。

完整MainWindow.xaml.cs代码:

WPF 水印装饰器WPF 水印装饰器

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading; using System.Threading.Tasks; using System.Windows; using System.Windows.Controls; using System.Windows.Data; using System.Windows.Documents; using System.Windows.Input; using System.Windows.Media; using System.Windows.Media.Imaging; using System.Windows.Navigation; using System.Windows.Shapes;  namespace WPF水印装饰器 {     /// <summary>     /// MainWindow.xaml 的交互逻辑     /// </summary>     public partial class MainWindow : Window     {         private string _watermarkText = "持续研发测试账号 34.8.99.64";          public MainWindow()         {             InitializeComponent();         }          private void Window_Loaded(object sender, RoutedEventArgs e)         {             UIElement uiElement = (UIElement)this.Content;             AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(uiElement);             adornerLayer.Add(new WatermarkAdorner(uiElement, _watermarkText));         }          private void Window_MouseRightButtonDown(object sender, MouseButtonEventArgs e)         {             this.Close();         }          private void button_Click(object sender, RoutedEventArgs e)         {             Window2 win = new Window2(_watermarkText);             win.Owner = this;             win.WindowStartupLocation = WindowStartupLocation.CenterScreen;             win.Show();         }          private void button2_Click(object sender, RoutedEventArgs e)         {             Watermark win = new Watermark(_watermarkText);             win.Owner = this;             win.WindowStartupLocation = WindowStartupLocation.CenterScreen;             win.Show();         }     } }

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效果图:

WPF 水印装饰器

 

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未经允许不得转载:张拓的天空 » WPF 水印装饰器
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