• 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:

    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
    
        }
    }
    View Code

    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));
    View Code

    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>
    View Code

    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();
            }
        }
    }
    View Code

    效果图:

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  • 原文地址:https://www.cnblogs.com/s0611163/p/15245412.html
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