C#软件开发实例.私人订制自己的屏幕截图工具(四)基本截图功能实现
本实例全部文章目录
(三)托盘图标及菜单的实现
(四)基本截图功能实现
(五)针对拖拽时闪烁卡顿现象的优化
(六)添加配置管理功能
(七)添加放大镜的功能
(八)添加键盘操作截图的功能
(九)使用自定义光标,QQ截图时的光标
(十)在截图中包含鼠标指针形状
实现原理
基本截图的功能主要靠响应主窗体的鼠标按下、鼠标移动、鼠标抬起几个事件的功能来实现的。截取的图片区域使用“Label”组件来显示,需要重新实现“Label”组件的“Paint”方法。
左键单击开始截图,右键单击取消截图,双击鼠标左键完成截图,将截取的图片保存到Windows剪贴板中。
添加“Label”组件
工具箱》公共组件》双击“Label”组件,修改组件属性:
Name=lbl_CutImage,
AutoSize=False,
BackColor=Transparent,
Text = “”
“Form1_Load”事件添加代码:
- this.lbl_CutImage.Hide();
定义截图功能依赖的基本变量
- #region 截图基本变量
- /// <summary>
- /// 用于判断是否已经开始截图,控制信息框是否显示。
- /// </summary>
- private bool isCuting;
- /// <summary>
- /// 鼠标按下的点
- /// </summary>
- private Point beginPoint;
- /// <summary>
- /// 最终确定的绘图基点
- /// </summary>
- private Point endPoint;
- /// <summary>
- /// 用于记录截图显示区域的大小(包括调整块的区域,调整区域边框宽度2px)
- /// </summary>
- private Rectangle cutImageRect = new Rectangle(0, 0, 5, 5);
- #endregion
定义枚举类型:更新UI的模式
- /// <summary>
- /// 更新UI的模式,用于标记哪些需要显示,哪些需要隐藏;
- /// </summary>
- [FlagsAttribute]
- public enum UpdateUIMode : uint
- {
- //值得注意的是,如果要使用组合值,那么就不能用连接的数字表示,必须是几何级增长!
- None = 0,
- ShowTextPro = 1,
- ShowPenStyle = 2,
- ShowToolBox = 4,
- ShowInfoBox = 8,
- ShowZoomBox = 16,
- ShowCutImage = 32,
- HideTextPro = 64,
- HidePenStyle = 128,
- HideToolBox = 256,
- HideInfoBox = 512
- }
添加方法:计算并保存截图的区域框的大小
- /// <summary>
- /// 计算并保存截图的区域框的大小
- /// </summary>
- private void SaveCutImageSize(Point beginPoint, Point endPoint)
- {
- // 保存最终的绘图基点,用于截取选中的区域
- this.endPoint = beginPoint;
- // 计算截取图片的大小
- int imgWidth = Math.Abs(endPoint.X - beginPoint.X) + 1;
- int imgHeight = Math.Abs(endPoint.Y - beginPoint.Y) + 1;
- int lblWidth = imgWidth + 4;
- int lblHeight = imgHeight + 4;
- // 设置截图区域的位置和大小
- this.cutImageRect = new Rectangle(beginPoint.X - 2, beginPoint.Y - 2, lblWidth, lblHeight);
- }
添加方法:执行截图,将选定区域的图片保存到剪贴板
- /// <summary>
- /// 执行截图,将选定区域的图片保存到剪贴板
- /// </summary>
- /// <param name="saveToDisk">
- /// 是否将图片保存到磁盘
- /// </param>
- private void ExecCutImage(bool saveToDisk, bool uploadImage) //bool saveToDisk = false, bool uploadImage = false
- {
- // 如果图片获取区域不可见,则退出保存图片过程
- if (!this.lbl_CutImage.Visible) { return; }
- Rectangle srcRect = new Rectangle();
- srcRect.X = this.lbl_CutImage.Location.X + 2;
- srcRect.Y = this.lbl_CutImage.Location.Y + 2;
- srcRect.Width = this.lbl_CutImage.Width - 4;
- srcRect.Height = this.lbl_CutImage.Height - 4;
- Rectangle destRect = new Rectangle(0, 0, srcRect.Width, srcRect.Height);
- Bitmap bmp = new Bitmap(srcRect.Width, srcRect.Height);
- Graphics g = Graphics.FromImage(bmp);
- g.DrawImage(this.screenImage, destRect, srcRect, GraphicsUnit.Pixel);
- Clipboard.SetImage(bmp);
- ExitCutImage(true);
- }
添加方法:退出截图过程
- /// <summary>
- /// 退出截图过程
- /// </summary>
- private void ExitCutImage(bool hideWindow) // = true
- {
- this.lbl_CutImage.Visible = false;
- this.isCuting = false;
- if (hideWindow)
- {
- this.screenImage.Dispose();
- this.Hide();
- }
- }
主窗口鼠标按下事件处理程序
- /// <summary>
- /// 截图窗口鼠标按下事件处理程序
- /// </summary>
- /// <param name="sender"></param>
- /// <param name="e"></param>
- private void Form1_MouseDown(object sender, MouseEventArgs e)
- {
- // 左键单击事件
- if (e.Button == MouseButtons.Left && e.Clicks == 1)
- {
- if (!this.lbl_CutImage.Visible)
- {
- this.isCuting = true;
- this.beginPoint = e.Location;
- this.endPoint = e.Location;
- SaveCutImageSize(e.Location, e.Location);
- UpdateCutInfoLabel(UpdateUIMode.ShowCutImage | UpdateUIMode.ShowInfoBox);
- }
- }
- // 左键双击事件
- if (e.Button == MouseButtons.Left && e.Clicks == 2)
- {
- if (this.lbl_CutImage.Visible)
- {
- ExecCutImage(false, false);
- }
- }
- // 右键单击事件
- if (e.Button == MouseButtons.Right)
- {
- ExitCutImage(!this.lbl_CutImage.Visible);
- }
- }
主窗口鼠标移动事件处理程序
- /// <summary>
- /// 截图窗口鼠标移动事件处理程序
- /// </summary>
- /// <param name="sender"></param>
- /// <param name="e"></param>
- private void Form1_MouseMove(object sender, MouseEventArgs e)
- {
- // 如果截取区域不可见,则退出处理过程
- if (!this.lbl_CutImage.Visible)
- {
- UpdateCutInfoLabel(UpdateUIMode.None);
- return;
- }
- Point pntBgn = this.beginPoint;
- Point pntEnd = e.Location;
- // 如果是反向拖动,重新设置起始点
- if (e.Location.X < this.beginPoint.X && e.Location.Y < this.beginPoint.Y)
- {
- pntBgn = e.Location;
- pntEnd = this.beginPoint;
- }
- else
- {
- if (e.Location.X < this.beginPoint.X)
- {
- pntBgn = new Point(e.Location.X, this.beginPoint.Y);
- pntEnd = new Point(this.beginPoint.X, e.Location.Y);
- }
- else
- {
- if (e.Location.Y < this.beginPoint.Y)
- {
- pntBgn = new Point(this.beginPoint.X, e.Location.Y);
- pntEnd = new Point(e.Location.X, this.beginPoint.Y);
- }
- }
- }
- if (this.isCuting)
- {
- SaveCutImageSize(pntBgn, pntEnd);
- }
- UpdateCutInfoLabel(UpdateUIMode.None);
- }
主窗口鼠标抬起事件处理程序
- /// <summary>
- /// 截图窗口鼠标抬起事件处理程序
- /// </summary>
- /// <param name="sender"></param>
- /// <param name="e"></param>
- private void Form1_MouseUp(object sender, MouseEventArgs e)
- {
- if (e.Button == MouseButtons.Left)
- {
- if (this.isCuting)
- {
- this.isCuting = false;
- UpdateCutInfoLabel(UpdateUIMode.None);
- }
- }
- }
截取区域图片绘制
- /// <summary>
- /// 截取区域图片的绘制事件处理程序
- /// </summary>
- /// <param name="sender"></param>
- /// <param name="e"></param>
- private void lbl_CutImage_Paint(object sender, PaintEventArgs e)
- {
- int imgWidth = this.lbl_CutImage.Width - 4;
- int imgHeight = this.lbl_CutImage.Height - 4;
- if (imgWidth < 1) { imgWidth = 1; }
- if (imgHeight < 1) { imgHeight = 1; }
- // 创建缓存图像,先将要绘制的内容全部绘制到缓存中,最后再一次性绘制到 Label 上,
- // 这样可以提高性能,并且可以防止屏幕闪烁的问题
- Bitmap bmp_lbl = new Bitmap(this.lbl_CutImage.Width, this.lbl_CutImage.Height);
- Graphics g = Graphics.FromImage(bmp_lbl);
- // 将要截取的部分绘制到缓存
- Rectangle destRect = new Rectangle(2, 2, imgWidth, imgHeight);
- Point srcPoint = this.lbl_CutImage.Location;
- srcPoint.Offset(2, 2);
- Rectangle srcRect = new Rectangle(srcPoint, new System.Drawing.Size(imgWidth, imgHeight));
- g.DrawImage(this.screenImage, destRect, srcRect, GraphicsUnit.Pixel);
- SolidBrush brush = new SolidBrush(Color.FromArgb(10, 124, 202));
- Pen pen = new Pen(brush, 1.0F);
- //以下部分(边框和调整块)的绘制放在(编辑内容)的后面,是解决绘制编辑内容会覆盖(边框和调整块)的问题
- // 绘制边框外的区域,解决会被编辑内容覆盖的问题
- // 上边
- destRect = new Rectangle(0, 0, this.lbl_CutImage.Width, 2);
- srcPoint = this.lbl_CutImage.Location;
- //srcPoint.Offset(2, 2);
- srcRect = new Rectangle(srcPoint, new System.Drawing.Size(this.lbl_CutImage.Width, 2));
- g.DrawImage(this.BackgroundImage, destRect, srcRect, GraphicsUnit.Pixel);
- // 下边
- destRect = new Rectangle(0, this.lbl_CutImage.Height - 2, this.lbl_CutImage.Width, 2);
- srcPoint = this.lbl_CutImage.Location;
- srcPoint.Offset(0, this.lbl_CutImage.Height - 2);
- srcRect = new Rectangle(srcPoint, new System.Drawing.Size(this.lbl_CutImage.Width, 2));
- g.DrawImage(this.BackgroundImage, destRect, srcRect, GraphicsUnit.Pixel);
- // 左边
- destRect = new Rectangle(0, 2, 2, this.lbl_CutImage.Height - 4);
- srcPoint = this.lbl_CutImage.Location;
- srcPoint.Offset(0, 2);
- srcRect = new Rectangle(srcPoint, new System.Drawing.Size(2, this.lbl_CutImage.Height - 4));
- g.DrawImage(this.BackgroundImage, destRect, srcRect, GraphicsUnit.Pixel);
- // 右边
- destRect = new Rectangle(this.lbl_CutImage.Width - 2, 2, 2, this.lbl_CutImage.Height - 4);
- srcPoint = this.lbl_CutImage.Location;
- srcPoint.Offset(this.lbl_CutImage.Width - 2, 2);
- srcRect = new Rectangle(srcPoint, new System.Drawing.Size(2, this.lbl_CutImage.Height - 4));
- g.DrawImage(this.BackgroundImage, destRect, srcRect, GraphicsUnit.Pixel);
- // 绘制边框
- g.DrawLine(pen, 2, 2, this.lbl_CutImage.Width - 3, 2);
- g.DrawLine(pen, 2, 2, 2, this.lbl_CutImage.Height - 3);
- g.DrawLine(pen, this.lbl_CutImage.Width - 3, 2, this.lbl_CutImage.Width - 3, this.lbl_CutImage.Height - 3);
- g.DrawLine(pen, 2, this.lbl_CutImage.Height - 3, this.lbl_CutImage.Width - 3, this.lbl_CutImage.Height - 3);
- // 绘制四个角的调整块
- g.FillRectangle(brush, 0, 0, 4, 5);
- g.FillRectangle(brush, this.lbl_CutImage.Width - 4, 0, 4, 5);
- g.FillRectangle(brush, 0, this.lbl_CutImage.Height - 5, 4, 5);
- g.FillRectangle(brush, this.lbl_CutImage.Width - 4, this.lbl_CutImage.Height - 5, 4, 5);
- // 绘制中间的四个调整块
- int blockX = this.lbl_CutImage.Width / 2 - 2;
- int blockY = this.lbl_CutImage.Height / 2 - 2;
- g.FillRectangle(brush, blockX, 0, 4, 5);
- g.FillRectangle(brush, 0, blockY, 4, 5);
- g.FillRectangle(brush, blockX, this.lbl_CutImage.Height - 5, 4, 5);
- g.FillRectangle(brush, this.lbl_CutImage.Width - 4, blockY, 4, 5);
- // 绘制到 Label 上
- e.Graphics.DrawImage(bmp_lbl, 0, 0);
- bmp_lbl.Dispose();
- }
双击鼠标左键完成截图功能
- /// <summary>
- /// 截取区域图片的鼠标按下事件处理程序
- /// </summary>
- /// <param name="sender"></param>
- /// <param name="e"></param>
- private void lbl_CutImage_MouseDown(object sender, MouseEventArgs e)
- {
- // 左键双击事件
- if (e.Button == MouseButtons.Left && e.Clicks == 2)
- {
- if (this.lbl_CutImage.Visible)
- {
- ExecCutImage(false, false);
- }
- }
- }
注意:代码都贴完了,别忘了为窗体或组件绑定事件处理程序;
例如:截取区域图片的鼠标按下事件处理程序“lbl_CutImage_MouseDown”,就是“lbl_CutImage”组件的“MouseDown”事件的处理程序,绑定方法参考下图:
到此,基本截图的功能实现已经实现,赶快去截取一张图片,粘贴到QQ的聊天窗口看看吧。
源码下载:http://download.csdn.net/detail/testcs_dn/7261365