作者：沐汐 Vicky
出處：http://www.cnblogs.com/EasyInvoice

一、 問題描述

在頁面使用PictureBox 載入資料圖片後，點選“列印”，只能列印圖片首頁，較大圖片則無法全部列印。

二、 原因分析

PictureBox中列印圖片時沒有設定繼續列印相關屬性，因此每次只能列印第1頁。

三、解決方法

PictureBox控制元件增加列印全部頁面屬性，如果為True,表示列印全部頁面；如果為False,保留原有邏輯不變。

在列印全部頁面時，將控制元件的圖片按頁面大小切割，列印頁面索引小於頁面總數時，設定列印屬性PrintPageEventArgs. HasMorePages = true繼續列印，列印完成後將該屬性設定為False結束列印。

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;//處理狀態
private HScrollBar hScrollBar;//水平滾動條
private VScrollBar vScrollBar;//垂直滾動條
private PrintDocument printDocument;//列印物件
private Rectangle currRect;//現在矩形物件
private Bitmap currBmp;//現在圖形物件
//private int hScrollBarMidVal;//水平滾動條中間值
//private int vScrollBarMidVal;//垂直滾動條中間值
private RectangleF srcRect;
private RectangleF destRect;
private bool isMoveScrollBar;//是否移動滾動條
int currentPageIndex = 0;//當前頁面
int pageCount = 0;//列印頁數

/// <summary>
/// 建構函式
/// </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);

//構造水平滾動條
hScrollBar = new HScrollBar();
hScrollBar.Visible = false;
hScrollBar.Dock = DockStyle.Bottom;
hScrollBar.Scroll += new ScrollEventHandler(scrollBar_Scroll);
this.Controls.Add(hScrollBar);

//構造垂直滾動條
vScrollBar = new VScrollBar();
vScrollBar.Visible = false;
vScrollBar.Dock = DockStyle.Right;
vScrollBar.Scroll +=new ScrollEventHandler(scrollBar_Scroll);
this.Controls.Add(vScrollBar);
}

#region 公共屬性

[Category("外觀"),Description("獲取或設定圖片")]
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();
}
}
}

//縮放比例
private int scaleSize = 1;
[Category("其它"),Description("獲取或設定圖片縮放比例")]
public Int32 ScaleSize
{
get { return scaleSize; }
set
{
if (value > 1 && value < 51)
{
scaleSize = value;
}
}
}

//縮放倍數
private int scaleScope = 5;
[Category("其它"),Description("獲取或設定圖片最大縮放倍數")]
public int ScaleScope
{
get { return scaleScope; }
set
{
if (value > 1 && value < 11)
{
scaleScope = value;
}
}
}

//圖片邊框顏色
//private Color borderColor = Color.DarkGray;
//[Category("其它"),Description("獲取或設定圖片邊框顏色")]
//public Color BorderColor
//{
// get { return borderColor; }
// set { borderColor = value; }
//}

//圖片邊框寬度
private int borderWidth = 5;
[Category("其它"),Description("獲取或設定圖片邊框寬度")]
public Int32 BorderWidth
{
get { return borderWidth; }
set { borderWidth = value; }
}

//列印全部頁面
[Category("其它"),Description("true-列印全部頁面，false-列印首頁")]
public bool PrintAllPages { get; set; }

#endregion

#region 內部公共方法

/// <summary>
/// 從新繪製
/// </summary>
protected override void OnPaint(PaintEventArgs pe)
{
// TODO: 在此處新增自定義繪製程式碼
// 呼叫基類 OnPaint
base.OnPaint(pe);

if (this.Image != null)
{
if (currBmp != null) { currBmp.Dispose(); }
currBmp = new Bitmap(currRect.Width + 2 * borderWidth,currRect.Height + 2 * borderWidth);
//繪製新圖片
using (Graphics g = Graphics.FromImage(currBmp))
{
using (Pen pen = new Pen(BackColor,borderWidth))
{
g.DrawRectangle(pen,borderWidth * 0.5f,currRect.Width + borderWidth,currRect.Height + borderWidth);
}
g.DrawImage(this.Image,borderWidth,currRect.Width,currRect.Height);
}

//圖片繪製到控制元件上
pe.Graphics.Clear(BackColor);
if (hScrollBar.Visible || vScrollBar.Visible)
{//滾動條可見
drawDisplayedScrollBars(pe.Graphics);
}
else
{//滾動條不可見
float x = 0,y = 0;
isMoveScrollBar = false;

//是否繪製到中心點座標
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>
/// 重寫控制元件大小發生改變事件
/// </summary>
protected override void OnClientSizeChanged(EventArgs e)
{
base.OnClientSizeChanged(e);
displayScrollBars();
setScrollBarsValues();
Invalidate();
}

#endregion

#region 圖片列印與預覽

/// <summary>
/// 列印圖片
/// </summary>
public void PrintPictrue()
{
PrintDialog printDialog = new PrintDialog();
printDialog.Document = printDocument;
//added by lky 2017-11-16 修復Windows 7 x64位環境無法彈出列印對話方塊的問題
printDialog.UseEXDialog = true;
if (printDialog.ShowDialog() == DialogResult.OK)
{
try
{
printDocument.Print();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message,"打印出錯",MessageBoxButtons.OK,MessageBoxIcon.Error);
return;
}
}
}

/// <summary>
/// 列印預覽
/// </summary>
public void PrintPreview()
{
PrintPreviewDialog printPreviewDialog = new PrintPreviewDialog();
printPreviewDialog.Document = printDocument;
try
{
printPreviewDialog.ShowDialog();
}
catch (Exception ex)
{
MessageBox.Show(ex.Message,MessageBoxIcon.Error);
}
}

/// <summary>
/// 列印圖片事件
/// </summary>
private void printDocument_PrintPage(object sender,PrintPageEventArgs e)
{
if (currBmp == null)
return;
try
{
if (PrintAllPages)//added by lky 2018-1-15 列印全部頁面
{
int pageWith =(int) e.PageSettings.PrintableArea.Width;
int pageHeight = (int)e.PageSettings.PrintableArea.Height;
int horizontalTimes = (int)Math.Ceiling((decimal)currBmp.Width / pageWith);//水平方向切割頁數
int verticalTimes = (int)Math.Ceiling((decimal)currBmp.Height / pageHeight);//垂直方向切割頁數
if (pageCount == 0)
{
pageCount = horizontalTimes * verticalTimes;//總頁數
currentPageIndex = 0;
}
int horizontalCurrentPosition = (currentPageIndex % horizontalTimes);//當前列印的水平偏移頁數
int verticalCurrentPosition = (int)Math.Floor((decimal)currentPageIndex / horizontalTimes);//當前列印的垂直偏移頁數
int x = horizontalCurrentPosition * pageWith;//水平方向列印偏移位置
int y = verticalCurrentPosition * pageHeight;//垂直方向列印偏移位置
int leftX = (currBmp.Width - x) > 0 ? (currBmp.Width - x) : 0;//水平方向未列印尺寸
int leftY = (currBmp.Height - y) > 0 ? (currBmp.Height - y) : 0;//垂直方向未列印尺寸

Bitmap printBmp = (Bitmap)currBmp.Clone(new Rectangle(x,(leftX > pageWith ? pageWith : leftX),(leftY > pageHeight ? pageHeight : leftY)),currBmp.PixelFormat); //待列印圖片快取
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;

e.Graphics.DrawImage(printBmp,printBmp.Width,printBmp.Height);
printBmp.Dispose();
currentPageIndex++;
e.HasMorePages = currentPageIndex < pageCount;//是否繼續列印
if (!e.HasMorePages) pageCount = 0;//列印頁數置為0
}
else //僅列印首頁
{
Bitmap printBmp = (Bitmap)currBmp.Clone();
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
e.Graphics.PixelOffsetMode = PixelOffsetMode.HighSpeed;
e.Graphics.DrawImage(printBmp,printBmp.Height);
printBmp.Dispose();
}
}
catch (Exception ex)
{
//寫日誌檔案
LogWriter.Write(LOG_CATEGORY.WIN_UI,LOG_LEVEL.ERROR,"UCPicturBox.PrintPage" + ex.ToString());
}
}

#endregion

#region 圖片放大、縮小、原始大小、全屏顯示、旋轉功能

/// <summary>
/// 放大圖片
/// </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>
/// 縮小圖片
/// </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>
/// 全屏顯示
/// </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>
/// 旋轉圖片
/// </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>
/// 顯示水平滾動條與垂直滾動條
/// </summary>
private void displayScrollBars()
{
//是否顯示水平滾動條
if ((currRect.Width + 2 * borderWidth) > ClientSize.Width)
{ hScrollBar.Visible = true; }
else
{ hScrollBar.Visible = false; }

//是否顯示垂直滾動條
if ((currRect.Height + 2 * borderWidth) > ClientSize.Height)
{ vScrollBar.Visible = true; }
else
{ vScrollBar.Visible = false; }
}

/// <summary>
/// 設定水平滾動條與垂直滾動條值
/// </summary>
private void setScrollBarsValues()
{
//設定水平滾動條值
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;

//繪製座標為中心點
if (this.SizeMode == PictureBoxSizeMode.CenterImage)
{
if (hScrollBar.Value == 0 || isMoveScrollBar == false)
{
hScrollBar.Value = (hScrollBar.Maximum - hScrollBar.LargeChange) / 2;
}
}
}
else
{ hScrollBar.Value = 0; }

//設定垂直滾動條值
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;

//繪製座標為中心點
if (this.SizeMode == PictureBoxSizeMode.CenterImage)
{
if (vScrollBar.Value == 0 || isMoveScrollBar ==false)
{
vScrollBar.Value = (vScrollBar.Maximum - vScrollBar.LargeChange) / 2;
}
}
}
else
{ vScrollBar.Value = 0; }
}

/// <summary>
/// 移動水平滾動條事件
/// </summary>
private void scrollBar_Scroll(object sender,ScrollEventArgs e)
{
isMoveScrollBar = true;
using (Graphics graphics = this.CreateGraphics())
{
drawDisplayedScrollBars(graphics);
}
this.Update();
}

/// <summary>
/// 從新繪製顯示的滾動條
/// </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)
{//水平滾動條不可見
destRect.X = x;
destRect.Y = 0;
srcRect.X = 0;
srcRect.Y = vScrollBar.Value;
}
else if (vScrollBar.Visible == false)
{//垂直滾動條不可見
destRect.X = 0;
destRect.Y = y;
srcRect.Y = 0;
srcRect.X = hScrollBar.Value;
}
else
{//兩個滾動條都可見
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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