WPF实现截图(仿微信截图)
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每日一笑
肚子疼,去厕所排便,结果什么都没拉出来。看着自己坐在马桶上痛苦又努力却一无所获的样子,仿佛看到了自己平凡的一生。
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。
欢迎转发、分享、点赞,谢谢大家~。
效果预览(更多效果请下载源码体验)
一、ScreenCut.cs 代码如下
using Microsoft.Win32;
using System;
using System.Collections.Generic;
using System.Drawing.Drawing2D;
using System.Drawing.Text;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes; namespace WPFDevelopers.Controls
{
[TemplatePart(Name = CanvasTemplateName, Type = typeof(Canvas))]
[TemplatePart(Name = RectangleLeftTemplateName, Type = typeof(Rectangle))]
[TemplatePart(Name = RectangleTopTemplateName, Type = typeof(Rectangle))]
[TemplatePart(Name = RectangleRightTemplateName, Type = typeof(Rectangle))]
[TemplatePart(Name = RectangleBottomTemplateName, Type = typeof(Rectangle))]
[TemplatePart(Name = BorderTemplateName, Type = typeof(Border))]
[TemplatePart(Name = WrapPanelTemplateName, Type = typeof(WrapPanel))]
[TemplatePart(Name = ButtonSaveTemplateName, Type = typeof(Button))]
[TemplatePart(Name = ButtonCancelTemplateName, Type = typeof(Button))]
[TemplatePart(Name = ButtonCompleteTemplateName, Type = typeof(Button))] public class ScreenCut : Window
{
private const string CanvasTemplateName = "PART_Canvas";
private const string RectangleLeftTemplateName = "PART_RectangleLeft";
private const string RectangleTopTemplateName = "PART_RectangleTop";
private const string RectangleRightTemplateName = "PART_RectangleRight";
private const string RectangleBottomTemplateName = "PART_RectangleBottom";
private const string BorderTemplateName = "PART_Border";
private const string WrapPanelTemplateName = "PART_WrapPanel";
private const string ButtonSaveTemplateName = "PART_ButtonSave";
private const string ButtonCancelTemplateName = "PART_ButtonCancel";
private const string ButtonCompleteTemplateName = "PART_ButtonComplete"; private Canvas _canvas;
private Rectangle _rectangleLeft, _rectangleTop, _rectangleRight, _rectangleBottom;
private Border _border;
private WrapPanel _wrapPanel;
private Button _buttonSave,_buttonCancel, _buttonComplete;
private Rect rect;
private Point pointStart, pointEnd;
private bool isMouseUp = false; static ScreenCut()
{
DefaultStyleKeyProperty.OverrideMetadata(typeof(ScreenCut), new FrameworkPropertyMetadata(typeof(ScreenCut)));
}
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
_canvas = GetTemplateChild(CanvasTemplateName) as Canvas;
_rectangleLeft = GetTemplateChild(RectangleLeftTemplateName) as Rectangle;
_rectangleTop = GetTemplateChild(RectangleTopTemplateName) as Rectangle;
_rectangleRight = GetTemplateChild(RectangleRightTemplateName) as Rectangle;
_rectangleBottom = GetTemplateChild(RectangleBottomTemplateName) as Rectangle;
_border = GetTemplateChild(BorderTemplateName) as Border;
_wrapPanel = GetTemplateChild(WrapPanelTemplateName) as WrapPanel;
_buttonSave = GetTemplateChild(ButtonSaveTemplateName) as Button;
if (_buttonSave != null)
_buttonSave.Click += _buttonSave_Click;
_buttonCancel = GetTemplateChild(ButtonCancelTemplateName) as Button;
if (_buttonCancel != null)
_buttonCancel.Click += _buttonCancel_Click;
_buttonComplete = GetTemplateChild(ButtonCompleteTemplateName) as Button;
if (_buttonComplete != null)
_buttonComplete.Click += _buttonComplete_Click;
this._canvas.Background = new ImageBrush(ChangeBitmapToImageSource(CaptureScreen()));
_rectangleLeft.Width = _canvas.Width;
_rectangleLeft.Height = _canvas.Height;
} private void _buttonSave_Click(object sender, RoutedEventArgs e)
{
SaveFileDialog dlg = new SaveFileDialog();
dlg.FileName = $"WPFDevelopers{DateTime.Now.ToString("yyyyMMddHHmmss")}.jpg";
dlg.DefaultExt = ".jpg";
dlg.Filter = "image file|*.jpg"; if (dlg.ShowDialog() == true)
{
BitmapEncoder pngEncoder = new PngBitmapEncoder();
pngEncoder.Frames.Add(BitmapFrame.Create(CutBitmap()));
using (var fs = System.IO.File.OpenWrite(dlg.FileName))
{
pngEncoder.Save(fs);
fs.Dispose();
fs.Close();
}
}
Close();
} private void _buttonComplete_Click(object sender, RoutedEventArgs e)
{ Clipboard.SetImage(CutBitmap());
Close();
}
CroppedBitmap CutBitmap()
{
var renderTargetBitmap = new RenderTargetBitmap((int)_canvas.Width,
(int)_canvas.Height, 96d, 96d, System.Windows.Media.PixelFormats.Default);
renderTargetBitmap.Render(_canvas);
return new CroppedBitmap(renderTargetBitmap, new Int32Rect((int)rect.X, (int)rect.Y, (int)rect.Width, (int)rect.Height));
}
private void _buttonCancel_Click(object sender, RoutedEventArgs e)
{
Close();
} protected override void OnPreviewKeyDown(KeyEventArgs e)
{
if (e.Key == Key.Escape)
Close();
} protected override void OnPreviewMouseLeftButtonDown(MouseButtonEventArgs e)
{
if (!isMouseUp)
{
_wrapPanel.Visibility = Visibility.Hidden;
pointStart = e.GetPosition(_canvas);
pointEnd = pointStart;
rect = new Rect(pointStart, pointEnd);
} }
protected override void OnPreviewMouseMove(MouseEventArgs e)
{
if (e.LeftButton == MouseButtonState.Pressed && !isMouseUp)
{
var current = e.GetPosition(_canvas);
MoveAllRectangle(current);
}
}
protected override void OnPreviewMouseLeftButtonUp(MouseButtonEventArgs e)
{
if (!isMouseUp)
{
_wrapPanel.Visibility = Visibility.Visible;
Canvas.SetLeft(this._wrapPanel, rect.X + rect.Width - this._wrapPanel.ActualWidth);
Canvas.SetTop(this._wrapPanel, rect.Y + rect.Height + 4);
isMouseUp = true;
}
} void MoveAllRectangle(Point current)
{
pointEnd = current;
rect = new Rect(pointStart, pointEnd);
this._rectangleLeft.Width = rect.X;
this._rectangleLeft.Height = _canvas.Height; Canvas.SetLeft(this._rectangleTop, this._rectangleLeft.Width);
this._rectangleTop.Width = rect.Width;
double h = 0.0;
if (current.Y < pointStart.Y)
h = current.Y;
else
h = current.Y - rect.Height;
this._rectangleTop.Height = h; Canvas.SetLeft(this._rectangleRight, this._rectangleLeft.Width + rect.Width);
this._rectangleRight.Width = _canvas.Width - (rect.Width + this._rectangleLeft.Width);
this._rectangleRight.Height = _canvas.Height; Canvas.SetLeft(this._rectangleBottom, this._rectangleLeft.Width);
Canvas.SetTop(this._rectangleBottom, rect.Height + this._rectangleTop.Height);
this._rectangleBottom.Width = rect.Width;
this._rectangleBottom.Height = _canvas.Height - (rect.Height + this._rectangleTop.Height); this._border.Height = rect.Height;
this._border.Width = rect.Width;
Canvas.SetLeft(this._border, rect.X);
Canvas.SetTop(this._border, rect.Y);
} System.Drawing.Bitmap CaptureScreen()
{
var bmpCaptured = new System.Drawing.Bitmap((int)SystemParameters.PrimaryScreenWidth, (int)SystemParameters.PrimaryScreenHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);
using (System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(bmpCaptured))
{
g.SmoothingMode = SmoothingMode.AntiAlias;
g.CompositingQuality = CompositingQuality.HighQuality;
g.InterpolationMode = InterpolationMode.HighQualityBicubic;
g.TextRenderingHint = TextRenderingHint.ClearTypeGridFit;
g.PixelOffsetMode = PixelOffsetMode.HighQuality; g.CopyFromScreen(0, 0, 0, 0, bmpCaptured.Size, System.Drawing.CopyPixelOperation.SourceCopy);
}
return bmpCaptured;
} [System.Runtime.InteropServices.DllImport("gdi32.dll")]
public static extern bool DeleteObject(IntPtr hObject);
ImageSource ChangeBitmapToImageSource(System.Drawing.Bitmap bitmap)
{
IntPtr hBitmap = bitmap.GetHbitmap();
ImageSource wpfBitmap = System.Windows.Interop.Imaging.CreateBitmapSourceFromHBitmap(
hBitmap,
IntPtr.Zero,
Int32Rect.Empty,
BitmapSizeOptions.FromEmptyOptions()); if (!DeleteObject(hBitmap))
{
throw new System.ComponentModel.Win32Exception();
}
return wpfBitmap;
}
}
}
二、ScreenCut.xaml 代码如下
<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:controls="clr-namespace:WPFDevelopers.Controls"> <ResourceDictionary.MergedDictionaries>
<ResourceDictionary Source="Basic/ControlBasic.xaml"/>
<ResourceDictionary Source="../Styles/Styles.Buttons.xaml"/>
</ResourceDictionary.MergedDictionaries> <Style x:Key="RectangleStyle" TargetType="{x:Type Rectangle}">
<Setter Property="Fill" Value="{StaticResource BlackSolidColorBrush}"/>
<Setter Property="Opacity" Value=".5"/>
</Style> <Style TargetType="{x:Type controls:ScreenCut}" BasedOn="{StaticResource ControlBasicStyle}">
<Setter Property="WindowState" Value="Maximized"/>
<Setter Property="WindowStyle" Value="None"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type controls:ScreenCut}">
<Canvas x:Name="PART_Canvas"
Width="{Binding Source={x:Static SystemParameters.PrimaryScreenWidth}}"
Height="{Binding Source={x:Static SystemParameters.PrimaryScreenHeight}}">
<Rectangle x:Name="PART_RectangleLeft" Style="{StaticResource RectangleStyle}"/>
<Rectangle x:Name="PART_RectangleTop" Style="{StaticResource RectangleStyle}"/>
<Rectangle x:Name="PART_RectangleRight" Style="{StaticResource RectangleStyle}"/>
<Rectangle x:Name="PART_RectangleBottom" Style="{StaticResource RectangleStyle}"/>
<Border x:Name="PART_Border" BorderBrush="{StaticResource SuccessPressedSolidColorBrush}"
BorderThickness="1"/>
<WrapPanel x:Name="PART_WrapPanel"
Visibility="Hidden" Panel.ZIndex="99"
Height="38" Background="{StaticResource WhiteSolidColorBrush}"
VerticalAlignment="Center">
<Button x:Name="PART_ButtonSave" Style="{StaticResource PathButton}"
ToolTip="保存" Margin="10,0,0,0">
<Button.Content>
<Path Fill="{StaticResource InfoPressedSolidColorBrush}"
Width="18" Height="18" Stretch="Fill"
Data="{StaticResource PathSave}"/>
</Button.Content>
</Button>
<Button x:Name="PART_ButtonCancel" Style="{StaticResource PathButton}"
ToolTip="取消">
<Button.Content>
<Path Fill="{StaticResource DangerPressedSolidColorBrush}"
Width="14" Height="14" Stretch="Fill"
Data="{StaticResource PathCancel}"/>
</Button.Content>
</Button>
<Button x:Name="PART_ButtonComplete" Style="{StaticResource PathButton}"
ToolTip="完成" Margin="0,0,10,0">
<Button.Content>
<Path Fill="{StaticResource SuccessPressedSolidColorBrush}"
Width="20" Height="15" Stretch="Fill"
Data="{StaticResource PathComplete}"/>
</Button.Content>
</Button>
</WrapPanel> </Canvas>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</ResourceDictionary>
三、ScreenCutExample.xaml 代码如下
var screenCut = new ScreenCut();
screenCut.ShowDialog();
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WPF开发者QQ群: 340500857
blogs: https://www.cnblogs.com/yanjinhua/p/14345136.html
源码Github:https://github.com/yanjinhuagood/WPFDevelopers.git
gitee:https://gitee.com/yanjinhua/WPFDevelopers.git
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