作者：沐汐 Vicky
出处：http://www.cnblogs.com/EasyInvoice
一、 问题描述
在页面使用PictureBox 加载资料图片后，点击“打印”，只能打印图片首页，较大图片则无法全部打印。
二、 原因分析
PictureBox中打印图片时没有设置继续打印相关属性，因此每次只能打印第1页。
三、解决方法
PictureBox控件增加打印全部页面属性，如果为True,表示打印全部页面；如果为False,保留原有逻辑不变。
在打印全部页面时，将控件的图片按页面大小切割，打印页面索引小于页面总数时，设置打印属性PrintPageEventArgs. HasMorePages = true继续打印，打印完成后将该属性设置为False结束打印。
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namespace MyClass{ //public enum OperationState { Default, ZoomIn, ZoomOut }; public partial class UCPictureBox : PictureBox { //private OperationState operationState;//处理状态 private HScrollBar hScrollBar;//水平滚动条 private VScrollBar vScrollBar;//垂直滚动条 private PrintDocument printDocument;//打印对象 private Rectangle currRect;//现在矩形对象 private Bitmap currBmp;//现在图形对象 //private int hScrollBarMidVal;//水平滚动条中间值 //private int vScrollBarMidVal;//垂直滚动条中间值 private RectangleF srcRect; private RectangleF destRect; private bool isMoveScrollBar;//是否移动滚动条 int currentPageIndex = 0;//当前页面 int pageCount = 0;//打印页数 /// <summary> /// 构造函数 /// </summary> public UCPictureBox() { InitializeComponent(); SetStyle(ControlStyles.OptimizedDoubleBuffer, true); SetStyle(ControlStyles.AllPaintingInWmPaint, true); //hScrollBarMidVal = 0; //vScrollBarMidVal = 0; //operationState = OperationState.Default; isMoveScrollBar = false; srcRect = new RectangleF(); destRect = new RectangleF(); printDocument = new PrintDocument(); printDocument.PrintPage += new PrintPageEventHandler(printDocument_PrintPage); //构造水平滚动条 hScrollBar = new HScrollBar(); hScrollBar.Visible = false; hScrollBar.Dock = DockStyle.Bottom; hScrollBar.Scroll += new ScrollEventHandler(scrollBar_Scroll); this.Controls.Add(hScrollBar); //构造垂直滚动条 vScrollBar = new VScrollBar(); vScrollBar.Visible = false; vScrollBar.Dock = DockStyle.Right; vScrollBar.Scroll +=new ScrollEventHandler(scrollBar_Scroll); this.Controls.Add(vScrollBar); } #region 公共属性 [Category("外观"), Description("获取或设置图片")] public new Image Image { get { return base.Image; } set { if (value != null) { base.Image = value; currRect.Width = base.Image.Width; currRect.Height = base.Image.Height; hScrollBar.Value = 0; vScrollBar.Value = 0; displayScrollBars(); setScrollBarsValues(); Invalidate(); } } } //缩放比例 private int scaleSize = 1; [Category("其它"), Description("获取或设置图片缩放比例")] public Int32 ScaleSize { get { return scaleSize; } set { if (value > 1 && value < 51) { scaleSize = value; } } } //缩放倍数 private int scaleScope = 5; [Category("其它"), Description("获取或设置图片最大缩放倍数")] public int ScaleScope { get { return scaleScope; } set { if (value > 1 && value < 11) { scaleScope = value; } } } //图片边框颜色 //private Color borderColor = Color.DarkGray; //[Category("其它"), Description("获取或设置图片边框颜色")] //public Color BorderColor //{ // get { return borderColor; } // set { borderColor = value; } //} //图片边框宽度 private int borderWidth = 5; [Category("其它"), Description("获取或设置图片边框宽度")] public Int32 BorderWidth { get { return borderWidth; } set { borderWidth = value; } } //打印全部页面 [Category("其它"),Description("true-打印全部页面，false-打印首页")] public bool PrintAllPages { get; set; } #endregion #region 内部公共方法 /// <summary> /// 从新绘制 /// </summary> protected override void OnPaint(PaintEventArgs pe) { // TODO: 在此处添加自定义绘制代码 // 调用基类 OnPaint base.OnPaint(pe); if (this.Image != null) { if (currBmp != null) { currBmp.Dispose(); } currBmp = new Bitmap(currRect.Width + 2 * borderWidth, currRect.Height + 2 * borderWidth); //绘制新图片 using (Graphics g = Graphics.FromImage(currBmp)) { using (Pen pen = new Pen(BackColor, borderWidth)) { g.DrawRectangle(pen, borderWidth * 0.5f, borderWidth * 0.5f, currRect.Width + borderWidth, currRect.Height + borderWidth); } g.DrawImage(this.Image, borderWidth, borderWidth, currRect.Width, currRect.Height); } //图片绘制到控件上 pe.Graphics.Clear(BackColor); if (hScrollBar.Visible || vScrollBar.Visible) {//滚动条可见 drawDisplayedScrollBars(pe.Graphics); } else {//滚动条不可见 float x = 0, y = 0; isMoveScrollBar = false; //是否绘制到中心点坐标 if (this.SizeMode == PictureBoxSizeMode.CenterImage) { x = Math.Abs(ClientSize.Width - currBmp.Width) * 0.5f; y = Math.Abs(ClientSize.Height - currBmp.Height) * 0.5f; } pe.Graphics.DrawImage(currBmp, x, y, currBmp.Width, currBmp.Height); } } } /// <summary> /// 重写控件大小发生改变事件 /// </summary> protected override void OnClientSizeChanged(EventArgs e) { base.OnClientSizeChanged(e); displayScrollBars(); setScrollBarsValues(); Invalidate(); } #endregion #region 图片打印与预览 /// <summary> /// 打印图片 /// </summary> public void PrintPictrue() { PrintDialog printDialog = new PrintDialog(); printDialog.Document = printDocument; //added by lky 2017-11-16 修复Windows 7 x64位环境无法弹出打印对话框的问题 printDialog.UseEXDialog = true; if (printDialog.ShowDialog() == DialogResult.OK) { try { printDocument.Print(); } catch (Exception ex) { MessageBox.Show(ex.Message, "打印出错", MessageBoxButtons.OK, MessageBoxIcon.Error); return; } } } /// <summary> /// 打印预览 /// </summary> public void PrintPreview() { PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog(); printPreviewDialog.Document = printDocument; try { printPreviewDialog.ShowDialog(); } catch (Exception ex) { MessageBox.Show(ex.Message, "打印出错", MessageBoxButtons.OK, MessageBoxIcon.Error); } } /// <summary> /// 打印图片事件 /// </summary> private void printDocument_PrintPage(object sender, PrintPageEventArgs e) { if (currBmp == null) return; try { if (PrintAllPages)//added by lky 2018-1-15 打印全部页面 { int pageWith =(int) e.PageSettings.PrintableArea.Width; int pageHeight = (int)e.PageSettings.PrintableArea.Height; int horizontalTimes = (int)Math.Ceiling((decimal)currBmp.Width / pageWith);//水平方向切割页数 int verticalTimes = (int)Math.Ceiling((decimal)currBmp.Height / pageHeight);//垂直方向切割页数 if (pageCount == 0) { pageCount = horizontalTimes * verticalTimes;//总页数 currentPageIndex = 0; } int horizontalCurrentPosition = (currentPageIndex % horizontalTimes);//当前打印的水平偏移页数 int verticalCurrentPosition = (int)Math.Floor((decimal)currentPageIndex / horizontalTimes);//当前打印的垂直偏移页数 int x = horizontalCurrentPosition * pageWith;//水平方向打印偏移位置 int y = verticalCurrentPosition * pageHeight;//垂直方向打印偏移位置 int leftX = (currBmp.Width - x) > 0 ? (currBmp.Width - x) : 0;//水平方向未打印尺寸 int leftY = (currBmp.Height - y) > 0 ? (currBmp.Height - y) : 0;//垂直方向未打印尺寸 Bitmap printBmp = (Bitmap)currBmp.Clone(new Rectangle(x, y, (leftX > pageWith ? pageWith : leftX), (leftY > pageHeight ? pageHeight : leftY)), currBmp.PixelFormat); //待打印图片缓存 e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed; e.Graphics.DrawImage(printBmp, 0, 0, printBmp.Width, printBmp.Height); printBmp.Dispose(); currentPageIndex++; e.HasMorePages = currentPageIndex < pageCount;//是否继续打印 if (!e.HasMorePages) pageCount = 0;//打印页数置为0 } else //仅打印首页 { Bitmap printBmp = (Bitmap)currBmp.Clone(); e.Graphics.SmoothingMode = SmoothingMode.AntiAlias; e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed; e.Graphics.DrawImage(printBmp, 0, 0, printBmp.Width, printBmp.Height); printBmp.Dispose(); } } catch (Exception ex) { //写日志文件 LogWriter.Write(LOG_CATEGORY.WIN_UI, LOG_LEVEL.ERROR, "UCPicturBox.PrintPage" + ex.ToString()); } } #endregion #region 图片放大、缩小、原始大小、全屏显示、旋转功能 /// <summary> /// 放大图片 /// </summary> public void ZoomInPicture() { if (this.Image != null) { //operationState = OperationState.ZoomIn; double scale = 1 + (scaleSize * 0.01); currRect.Width = Convert.ToInt32(currRect.Width * scale); currRect.Height = currRect.Width * this.Image.Height / this.Image.Width; if (currRect.Width < (this.Image.Width * scaleScope)) { displayScrollBars(); setScrollBarsValues(); Invalidate(); } } } /// <summary> /// 缩小图片 /// </summary> public void ZoomOutPicture() { if (this.Image != null) { //operationState = OperationState.ZoomOut; double scale = 1 - (scaleSize * 0.01); currRect.Width = Convert.ToInt32(currRect.Width * scale); currRect.Height = currRect.Width * this.Image.Height / this.Image.Width; displayScrollBars(); setScrollBarsValues(); Invalidate(); } } /// <summary> /// 原始大小 /// </summary> public void ZoomOriginalPicture() { if (this.Image != null) { //operationState = OperationState.Default; isMoveScrollBar = false; currRect.Width = this.Image.Width; currRect.Height = this.Image.Height; displayScrollBars(); setScrollBarsValues(); Invalidate(); } } /// <summary> /// 全屏显示 /// </summary> public void ZoomShowAllPicture() { if (this.Image != null) { if (this.Image.Width > this.Image.Height) { currRect.Width = ClientSize.Width - 2 * borderWidth; currRect.Height = currRect.Width * this.Image.Height / this.Image.Width; if ((currRect.Height + 2 * borderWidth) > ClientSize.Height) { currRect.Height = ClientSize.Height - 2 * borderWidth; currRect.Width = currRect.Height * this.Image.Width / this.Image.Height; } //if ((currRect.Height + 2 * borderWidth) > ClientSize.Height) //{ // currRect.Width = ClientSize.Width - 2 * borderWidth - vScrollBar.Width; // currRect.Height = currRect.Width * this.Image.Height / this.Image.Width; //} } else { currRect.Height = ClientSize.Height - 2 * borderWidth; currRect.Width = currRect.Height * this.Image.Width / this.Image.Height; if ((currRect.Width + 2 * borderWidth) > ClientSize.Width) { currRect.Width = ClientSize.Width - 2 * borderWidth; currRect.Height = currRect.Width * this.Image.Width / this.Image.Height; } //if ((currRect.Width + 2 * borderWidth) > ClientSize.Width) //{ // hScrollBar.Value = 0; // currRect.Height = ClientSize.Height - 2 * borderWidth - hScrollBar.Height; // currRect.Width = currRect.Height * this.Image.Width / this.Image.Height; //} } isMoveScrollBar = false; displayScrollBars(); setScrollBarsValues(); Invalidate(); } } /// <summary> /// 旋转图片 /// </summary> public void RotatePicture() { if (this.Image != null) { isMoveScrollBar = false; this.Image.RotateFlip(RotateFlipType.Rotate90FlipNone); int tempWidth = currRect.Width; currRect.Width = currRect.Height; currRect.Height = tempWidth; displayScrollBars(); setScrollBarsValues(); Invalidate(); } } /// <summary> /// 显示水平滚动条与垂直滚动条 /// </summary> private void displayScrollBars() { //是否显示水平滚动条 if ((currRect.Width + 2 * borderWidth) > ClientSize.Width) { hScrollBar.Visible = true; } else { hScrollBar.Visible = false; } //是否显示垂直滚动条 if ((currRect.Height + 2 * borderWidth) > ClientSize.Height) { vScrollBar.Visible = true; } else { vScrollBar.Visible = false; } } /// <summary> /// 设置水平滚动条与垂直滚动条值 /// </summary> private void setScrollBarsValues() { //设置水平滚动条值 if (hScrollBar.Visible) { hScrollBar.Minimum = 0; hScrollBar.Maximum = currRect.Width - ClientSize.Width + 2 * borderWidth; hScrollBar.LargeChange = currRect.Width / 10; if (vScrollBar.Visible) { hScrollBar.Maximum += vScrollBar.Width; } if (hScrollBar.LargeChange > hScrollBar.Maximum) { hScrollBar.LargeChange = hScrollBar.Maximum - 1; } hScrollBar.SmallChange = hScrollBar.LargeChange / 5; hScrollBar.Maximum += hScrollBar.LargeChange; //绘制坐标为中心点 if (this.SizeMode == PictureBoxSizeMode.CenterImage) { if (hScrollBar.Value == 0 || isMoveScrollBar == false) { hScrollBar.Value = (hScrollBar.Maximum - hScrollBar.LargeChange) / 2; } } } else { hScrollBar.Value = 0; } //设置垂直滚动条值 if (vScrollBar.Visible) { vScrollBar.Minimum = 0; vScrollBar.Maximum = currRect.Height - ClientSize.Height + 2 * borderWidth; vScrollBar.LargeChange = currRect.Height / 10; if (hScrollBar.Visible) { vScrollBar.Maximum += hScrollBar.Height; } if (vScrollBar.LargeChange > vScrollBar.Maximum) { vScrollBar.LargeChange = vScrollBar.Maximum - 1; } vScrollBar.SmallChange = vScrollBar.LargeChange / 5; vScrollBar.Maximum += vScrollBar.LargeChange; //绘制坐标为中心点 if (this.SizeMode == PictureBoxSizeMode.CenterImage) { if (vScrollBar.Value == 0 || isMoveScrollBar ==false) { vScrollBar.Value = (vScrollBar.Maximum - vScrollBar.LargeChange) / 2; } } } else { vScrollBar.Value = 0; } } /// <summary> /// 移动水平滚动条事件 /// </summary> private void scrollBar_Scroll(object sender, ScrollEventArgs e) { isMoveScrollBar = true; using (Graphics graphics = this.CreateGraphics()) { drawDisplayedScrollBars(graphics); } this.Update(); } /// <summary> /// 从新绘制显示的滚动条 /// </summary> private void drawDisplayedScrollBars(Graphics graphics) { float x = 0, y = 0; if (this.SizeMode == PictureBoxSizeMode.CenterImage) { x = Math.Abs(ClientSize.Width - currBmp.Width - vScrollBar.Width) * 0.5f; y = Math.Abs(ClientSize.Height - currBmp.Height - hScrollBar.Height) * 0.5f; } if (hScrollBar.Visible == false) {//水平滚动条不可见 destRect.X = x; destRect.Y = 0; srcRect.X = 0; srcRect.Y = vScrollBar.Value; } else if (vScrollBar.Visible == false) {//垂直滚动条不可见 destRect.X = 0; destRect.Y = y; srcRect.Y = 0; srcRect.X = hScrollBar.Value; } else {//两个滚动条都可见 destRect.X = 0; destRect.Y = 0; srcRect.X = hScrollBar.Value; srcRect.Y = vScrollBar.Value; } destRect.Width = currBmp.Width; destRect.Height = currBmp.Height; srcRect.Width = currBmp.Width; srcRect.Height = currBmp.Height; graphics.DrawImage(currBmp, destRect, srcRect, GraphicsUnit.Pixel); } #endregion }} |
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