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WPF实现截屏（仿微信）

作者：不正经 | 2024-02-25 06:22:19

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前言

      有小伙伴需要在软件反馈窗体增加截图功能需求，所以今天来实现一个仿微信的截图。

01

—

效果预览

效果预览（更多效果请下载源码体验）：

02

—

代码如下

一、ScreenCut.cs 代码如下

  1. using Microsoft.Win32;
  2. using System;
  3. using System.Collections.Generic;
  4. using System.Drawing.Drawing2D;
  5. using System.Drawing.Text;
  6. using System.Linq;
  7. using System.Text;
  8. using System.Windows;
  9. using System.Windows.Controls;
  10. using System.Windows.Input;
  11. using System.Windows.Media;
  12. using System.Windows.Media.Imaging;
  13. using System.Windows.Shapes;
  14.  
  15.  
  16. namespace WPFDevelopers.Controls
  17. {
  18.     [TemplatePart(Name = CanvasTemplateName, Type = typeof(Canvas))]
  19.     [TemplatePart(Name = RectangleLeftTemplateName, Type = typeof(Rectangle))]
  20.     [TemplatePart(Name = RectangleTopTemplateName, Type = typeof(Rectangle))]
  21.     [TemplatePart(Name = RectangleRightTemplateName, Type = typeof(Rectangle))]
  22.     [TemplatePart(Name = RectangleBottomTemplateName, Type = typeof(Rectangle))]
  23.     [TemplatePart(Name = BorderTemplateName, Type = typeof(Border))]
  24.     [TemplatePart(Name = WrapPanelTemplateName, Type = typeof(WrapPanel))]
  25.     [TemplatePart(Name = ButtonSaveTemplateName, Type = typeof(Button))]
  26.     [TemplatePart(Name = ButtonCancelTemplateName, Type = typeof(Button))]
  27.     [TemplatePart(Name = ButtonCompleteTemplateName, Type = typeof(Button))]
  28.  
  29.  
  30.     public class ScreenCut : Window
  31.     {
  32.         private const string CanvasTemplateName = "PART_Canvas";
  33.         private const string RectangleLeftTemplateName = "PART_RectangleLeft";
  34.         private const string RectangleTopTemplateName = "PART_RectangleTop";
  35.         private const string RectangleRightTemplateName = "PART_RectangleRight";
  36.         private const string RectangleBottomTemplateName = "PART_RectangleBottom";
  37.         private const string BorderTemplateName = "PART_Border";
  38.         private const string WrapPanelTemplateName = "PART_WrapPanel";
  39.         private const string ButtonSaveTemplateName = "PART_ButtonSave";
  40.         private const string ButtonCancelTemplateName = "PART_ButtonCancel";
  41.         private const string ButtonCompleteTemplateName = "PART_ButtonComplete";
  42.  
  43.  
  44.         private Canvas _canvas;
  45.         private Rectangle _rectangleLeft, _rectangleTop, _rectangleRight, _rectangleBottom;
  46.         private Border _border;
  47.         private WrapPanel _wrapPanel;
  48.         private Button _buttonSave,_buttonCancel, _buttonComplete;
  49.         private Rect rect;
  50.         private Point pointStart, pointEnd;
  51.         private bool isMouseUp = false;
  52.  
  53.  
  54.         static ScreenCut()
  55.         {
  56.             DefaultStyleKeyProperty.OverrideMetadata(typeof(ScreenCut), new FrameworkPropertyMetadata(typeof(ScreenCut)));
  57.         }
  58.         public override void OnApplyTemplate()
  59.         {
  60.             base.OnApplyTemplate();
  61.             _canvas = GetTemplateChild(CanvasTemplateName) as Canvas;
  62.             _rectangleLeft = GetTemplateChild(RectangleLeftTemplateName) as Rectangle;
  63.             _rectangleTop = GetTemplateChild(RectangleTopTemplateName) as Rectangle;
  64.             _rectangleRight = GetTemplateChild(RectangleRightTemplateName) as Rectangle;
  65.             _rectangleBottom = GetTemplateChild(RectangleBottomTemplateName) as Rectangle;
  66.             _border = GetTemplateChild(BorderTemplateName) as Border;
  67.             _wrapPanel = GetTemplateChild(WrapPanelTemplateName) as WrapPanel;
  68.             _buttonSave = GetTemplateChild(ButtonSaveTemplateName) as Button;
  69.             if (_buttonSave != null)
  70.                 _buttonSave.Click += _buttonSave_Click;
  71.             _buttonCancel = GetTemplateChild(ButtonCancelTemplateName) as Button;
  72.             if (_buttonCancel != null)
  73.                 _buttonCancel.Click += _buttonCancel_Click;
  74.             _buttonComplete = GetTemplateChild(ButtonCompleteTemplateName) as Button;
  75.             if (_buttonComplete != null)
  76.                 _buttonComplete.Click += _buttonComplete_Click;
  77.             this._canvas.Background = new ImageBrush(ChangeBitmapToImageSource(CaptureScreen()));
  78.             _rectangleLeft.Width = _canvas.Width;
  79.             _rectangleLeft.Height = _canvas.Height;
  80.         }
  81.  
  82.  
  83.         private void _buttonSave_Click(object sender, RoutedEventArgs e)
  84.         {
  85.             SaveFileDialog dlg = new SaveFileDialog();
  86.             dlg.FileName = $"WPFDevelopers{DateTime.Now.ToString("yyyyMMddHHmmss")}.jpg";
  87.             dlg.DefaultExt = ".jpg";
  88.             dlg.Filter = "image file|*.jpg";
  89.  
  90.  
  91.             if (dlg.ShowDialog() == true)
  92.             {
  93.                 BitmapEncoder pngEncoder = new PngBitmapEncoder();
  94.                 pngEncoder.Frames.Add(BitmapFrame.Create(CutBitmap()));
  95.                 using (var fs = System.IO.File.OpenWrite(dlg.FileName))
  96.                 {
  97.                     pngEncoder.Save(fs);
  98.                     fs.Dispose();
  99.                     fs.Close();
  100.                 }
  101.             }
  102.             Close();
  103.         }
  104.  
  105.  
  106.         private void _buttonComplete_Click(object sender, RoutedEventArgs e)
  107.         {
  108.            
  109.             Clipboard.SetImage(CutBitmap());
  110.             Close();
  111.         }
  112.         CroppedBitmap CutBitmap()
  113.         {
  114.             var renderTargetBitmap = new RenderTargetBitmap((int)_canvas.Width,
  115.   (int)_canvas.Height, 96d, 96d, System.Windows.Media.PixelFormats.Default);
  116.             renderTargetBitmap.Render(_canvas);
  117.             return  new CroppedBitmap(renderTargetBitmap, new Int32Rect((int)rect.X, (int)rect.Y, (int)rect.Width, (int)rect.Height));
  118.         }
  119.         private void _buttonCancel_Click(object sender, RoutedEventArgs e)
  120.         {
  121.             Close();
  122.         }
  123.  
  124.  
  125.         protected override void OnPreviewKeyDown(KeyEventArgs e)
  126.         {
  127.             if (e.Key == Key.Escape)
  128.                 Close();
  129.         }
  130.  
  131.  
  132.         protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
  133.         {
  134.             if (!isMouseUp)
  135.             {
  136.                 _wrapPanel.Visibility = Visibility.Hidden;
  137.                 pointStart = e.GetPosition(_canvas);
  138.                 pointEnd = pointStart;
  139.                 rect = new Rect(pointStart, pointEnd);
  140.             }
  141.  
  142.  
  143.         }
  144.         protected override void OnPreviewMouseMove(MouseEventArgs e)
  145.         {
  146.             if (e.LeftButton == MouseButtonState.Pressed && !isMouseUp)
  147.             {
  148.                 var current = e.GetPosition(_canvas);
  149.                 MoveAllRectangle(current);
  150.             }
  151.         }
  152.         protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
  153.         {
  154.             if (!isMouseUp)
  155.             {
  156.                 _wrapPanel.Visibility = Visibility.Visible;
  157.                 Canvas.SetLeft(this._wrapPanel, rect.X + rect.Width - this._wrapPanel.ActualWidth);
  158.                 Canvas.SetTop(this._wrapPanel, rect.Y + rect.Height + 4);
  159.                 isMouseUp = true;
  160.             }
  161.         }
  162.  
  163.  
  164.         void MoveAllRectangle(Point current)
  165.         {
  166.             pointEnd = current;
  167.             rect = new Rect(pointStart, pointEnd);
  168.             this._rectangleLeft.Width = rect.X;
  169.             this._rectangleLeft.Height = _canvas.Height;
  170.  
  171.  
  172.             Canvas.SetLeft(this._rectangleTop, this._rectangleLeft.Width);
  173.             this._rectangleTop.Width = rect.Width;
  174.             double h = 0.0;
  175.             if (current.Y < pointStart.Y)
  176.                 h = current.Y;
  177.             else
  178.                 h = current.Y - rect.Height;
  179.             this._rectangleTop.Height = h;
  180.  
  181.  
  182.             Canvas.SetLeft(this._rectangleRight, this._rectangleLeft.Width + rect.Width);
  183.             this._rectangleRight.Width = _canvas.Width - (rect.Width + this._rectangleLeft.Width);
  184.             this._rectangleRight.Height = _canvas.Height;
  185.  
  186.  
  187.             Canvas.SetLeft(this._rectangleBottom, this._rectangleLeft.Width);
  188.             Canvas.SetTop(this._rectangleBottom, rect.Height + this._rectangleTop.Height);
  189.             this._rectangleBottom.Width = rect.Width;
  190.             this._rectangleBottom.Height = _canvas.Height - (rect.Height + this._rectangleTop.Height);
  191.  
  192.  
  193.             this._border.Height = rect.Height;
  194.             this._border.Width = rect.Width;
  195.             Canvas.SetLeft(this._border, rect.X);
  196.             Canvas.SetTop(this._border, rect.Y);
  197.         }
  198.        
  199.         System.Drawing.Bitmap CaptureScreen()
  200.         {
  201.             var bmpCaptured = new System.Drawing.Bitmap((int)SystemParameters.PrimaryScreenWidth, (int)SystemParameters.PrimaryScreenHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
  202.             using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmpCaptured))
  203.             {
  204.                 g.SmoothingMode = SmoothingMode.AntiAlias;
  205.                 g.CompositingQuality = CompositingQuality.HighQuality;
  206.                 g.InterpolationMode = InterpolationMode.HighQualityBicubic;
  207.                 g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
  208.                 g.PixelOffsetMode = PixelOffsetMode.HighQuality;
  209.  
  210.  
  211.                 g.CopyFromScreen(0, 0, 0, 0, bmpCaptured.Size, System.Drawing.CopyPixelOperation.SourceCopy);
  212.             }
  213.             return bmpCaptured;
  214.         }
  215.  
  216.  
  217.         [System.Runtime.InteropServices.DllImport("gdi32.dll")]
  218.         public static extern bool DeleteObject(IntPtr hObject);
  219.         ImageSource ChangeBitmapToImageSource(System.Drawing.Bitmap bitmap)
  220.         {
  221.             IntPtr hBitmap = bitmap.GetHbitmap();
  222.             ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
  223.                 hBitmap,
  224.                 IntPtr.Zero,
  225.                 Int32Rect.Empty,
  226.                 BitmapSizeOptions.FromEmptyOptions());
  227.  
  228.  
  229.             if (!DeleteObject(hBitmap))
  230.             {
  231.                 throw new System.ComponentModel.Win32Exception();
  232.             }
  233.             return wpfBitmap;
  234.         }
  235.     }
  236. }


二、ScreenCut.xaml 代码如下 

  1. <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  2.                     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
  3.                     xmlns:controls="clr-namespace:WPFDevelopers.Controls">
  4.     
  5.     <ResourceDictionary.MergedDictionaries>
  6.         <ResourceDictionary Source="Basic/ControlBasic.xaml"/>
  7.         <ResourceDictionary Source="../Styles/Styles.Buttons.xaml"/>
  8.     </ResourceDictionary.MergedDictionaries>
  9.  
  10.  
  11.     <Style x:Key="RectangleStyle" TargetType="{x:Type Rectangle}">
  12.         <Setter Property="Fill" Value="{StaticResource BlackSolidColorBrush}"/>
  13.         <Setter Property="Opacity" Value=".5"/>
  14. </Style>
  15.     
  16.     <Style TargetType="{x:Type controls:ScreenCut}" BasedOn="{StaticResource ControlBasicStyle}">
  17.         <Setter Property="WindowState" Value="Maximized"/>
  18.         <Setter Property="WindowStyle" Value="None"/>
  19.         <Setter Property="Template">
  20.             <Setter.Value>
  21.                 <ControlTemplate TargetType="{x:Type controls:ScreenCut}">
  22.                     <Canvas x:Name="PART_Canvas"
  23.             Width="{Binding Source={x:Static SystemParameters.PrimaryScreenWidth}}"
  24.             Height="{Binding Source={x:Static SystemParameters.PrimaryScreenHeight}}">
  25.                         <Rectangle x:Name="PART_RectangleLeft" Style="{StaticResource RectangleStyle}"/>
  26.                         <Rectangle x:Name="PART_RectangleTop" Style="{StaticResource RectangleStyle}"/>
  27.                         <Rectangle x:Name="PART_RectangleRight" Style="{StaticResource RectangleStyle}"/>
  28.                         <Rectangle x:Name="PART_RectangleBottom" Style="{StaticResource RectangleStyle}"/>
  29.                         <Border x:Name="PART_Border" BorderBrush="{StaticResource SuccessPressedSolidColorBrush}" 
  30.                                 BorderThickness="1"/>
  31.                         <WrapPanel x:Name="PART_WrapPanel" 
  32.                                    Visibility="Hidden" Panel.ZIndex="99"
  33.                                    Height="38" Background="{StaticResource WhiteSolidColorBrush}"
  34.                                    VerticalAlignment="Center">
  35.                             <Button x:Name="PART_ButtonSave" Style="{StaticResource PathButton}"
  36.                                     ToolTip="保存" Margin="10,0,0,0">
  37.                                 <Button.Content>
  38.                                     <Path Fill="{StaticResource InfoPressedSolidColorBrush}" 
  39.                                           Width="18" Height="18" Stretch="Fill" 
  40.                                           Data="{StaticResource PathSave}"/>
  41.                                 </Button.Content>
  42.                             </Button>
  43.                             <Button x:Name="PART_ButtonCancel" Style="{StaticResource PathButton}"
  44.                                     ToolTip="取消">
  45.                                 <Button.Content>
  46.                                     <Path Fill="{StaticResource DangerPressedSolidColorBrush}" 
  47.                                           Width="14" Height="14" Stretch="Fill" 
  48.                                           Data="{StaticResource PathCancel}"/>
  49.                                 </Button.Content>
  50.                             </Button>
  51.                             <Button x:Name="PART_ButtonComplete"  Style="{StaticResource PathButton}"
  52.                                     ToolTip="完成" Margin="0,0,10,0">
  53.                                 <Button.Content>
  54.                                     <Path Fill="{StaticResource SuccessPressedSolidColorBrush}"  
  55.                                           Width="20" Height="15" Stretch="Fill" 
  56.                                           Data="{StaticResource PathComplete}"/>
  57.                                 </Button.Content>
  58.                             </Button>
  59.                         </WrapPanel>
  60.  
  61.  
  62.                     </Canvas>
  63.                 </ControlTemplate>
  64.             </Setter.Value>
  65.         </Setter>
  66. </Style>
  67. </ResourceDictionary>


三、ScreenCutExample.xaml 代码如下

  1. var screenCut = new ScreenCut();
  2.    screenCut.ShowDialog();

源码地址

github：https://github.com/yanjinhuagood/WPFDevelopers.git

gitee：https://gitee.com/yanjinhua/WPFDevelopers.git

WPF开发者QQ群： 340500857 

blogs： https://www.cnblogs.com/yanjinhua

Github：https://github.com/yanjinhuagood

出处：https://www.cnblogs.com/yanjinhua

版权：本作品采用「署名-非商业性使用-相同方式共享 4.0 国际」许可协议进行许可。

转载请著名作者 出处 https://github.com/yanjinhuagood

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