使用AdornerDecorator装饰器实现WPF水印
水印装饰器WatermarkAdorner类代码:
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 } }
如何使用:
在窗体或控件的Loaded方法中,添加如下代码:
UIElement uiElement = (UIElement)this.Content; AdornerLayer adornerLayer = AdornerLayer.GetAdornerLayer(uiElement); adornerLayer.Add(new WatermarkAdorner(uiElement, _watermarkText));
完整MainWindow.xaml代码:
<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>
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:
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(); } } }
效果图: