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。
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Drawing.Printing;
using System.Text;
using System.Windows.Forms;
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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