PrintController.cs source code in C# .NET

                        Code:
                         / FX-1434 / FX-1434 / 1.0 / untmp / whidbey / REDBITS / ndp / fx / src / CommonUI / System / Drawing / Printing / PrintController.cs / 1 / PrintController.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

namespace System.Drawing.Printing { 
 
    using Microsoft.Win32;
    using System; 
    using System.Diagnostics;
    using System.Drawing;
    using System.Runtime.InteropServices;
    using System.Security; 
    using System.Security.Permissions;
 
    ///  
    /// 
    ///    Controls how a document is printed. 
    /// 
    public abstract class PrintController {
        // DEVMODEs are pretty expensive, so we cache one here and share it with the
        // Standard and Preview print controllers.  If it weren't for all the rules about API changes, 
        // I'd consider making this protected.
        internal IntPtr modeHandle = IntPtr.Zero; // initialized in StartPrint 
 
        /// 
        ///  
        ///    
        ///       Initializes a new instance of the  class.
        ///    
        ///  
        protected PrintController() {
            IntSecurity.SafePrinting.Demand(); 
        } 

 
        /// 
        /// 
        ///    
        ///       This is new public property which notifies if this controller is used for PrintPreview. 
        ///    
        ///  
        public virtual bool IsPreview { 
            get{
                return false; 
            }
        }

        // WARNING: if you have nested PrintControllers, this method won't get called on the inner one. 
        // Add initialization code to StartPrint or StartPage instead.
        internal void Print(PrintDocument document) { 
            IntSecurity.SafePrinting.Demand(); 
            // Most of the printing security is left to the individual print controller
 
            //
            // Get the PrintAction for this event
            PrintAction printAction;
            if (IsPreview) 
            {
                printAction = PrintAction.PrintToPreview; 
            } 
            else {
                printAction = document.PrinterSettings.PrintToFile ? PrintAction.PrintToFile : PrintAction.PrintToPrinter; 
            }

            // Check that user has permission to print to this particular printer
            PrintEventArgs printEvent = new PrintEventArgs(printAction); 
            document._OnBeginPrint(printEvent);
            if (printEvent.Cancel) { 
                document._OnEndPrint(printEvent); 
                return;
            } 

            OnStartPrint(document, printEvent);
            if (printEvent.Cancel) {
                document._OnEndPrint(printEvent); 
                OnEndPrint(document, printEvent);
                return; 
            } 

            bool canceled = true; 

            try {
                canceled = PrintLoop(document);
            } 
            finally {
                try { 
                    try { 
                        document._OnEndPrint(printEvent);
                        printEvent.Cancel = canceled | printEvent.Cancel; 
                    }
                    finally {
                        OnEndPrint(document, printEvent);
                    } 
                }
                finally { 
                    if (!IntSecurity.HasPermission(IntSecurity.AllPrinting)) { 
                        // Ensure programs with SafePrinting only get to print once for each time they
                        // throw up the PrintDialog. 
                        IntSecurity.AllPrinting.Assert();
                        document.PrinterSettings.PrintDialogDisplayed = false;
                    }
                } 
            }
        } 
 
        // Returns true if print was aborted.
        // WARNING: if you have nested PrintControllers, this method won't get called on the inner one 
        // Add initialization code to StartPrint or StartPage instead.
        private bool PrintLoop(PrintDocument document) {
            QueryPageSettingsEventArgs queryEvent = new QueryPageSettingsEventArgs((PageSettings) document.DefaultPageSettings.Clone());
            for (;;) { 
                document._OnQueryPageSettings(queryEvent);
                if (queryEvent.Cancel) { 
                    return true; 
                }
 
                PrintPageEventArgs pageEvent = CreatePrintPageEvent(queryEvent.PageSettings);
                Graphics graphics = OnStartPage(document, pageEvent);
                pageEvent.SetGraphics(graphics);
 
                try {
                    document._OnPrintPage(pageEvent); 
                    OnEndPage(document, pageEvent); 
                }
                finally { 
                    pageEvent.Dispose();
                }

                if (pageEvent.Cancel) { 
                    return true;
                } 
                else if (!pageEvent.HasMorePages) { 
                    return false;
                } 
                else {
                    // loop
                }
            } 
        }
 
        private PrintPageEventArgs CreatePrintPageEvent(PageSettings pageSettings) { 
            IntSecurity.AllPrintingAndUnmanagedCode.Assert();
 
            Debug.Assert(modeHandle != IntPtr.Zero, "modeHandle is null.  Someone must have forgot to call base.StartPrint");


            Rectangle pageBounds = pageSettings.GetBounds(modeHandle); 
            Rectangle marginBounds = new Rectangle(pageSettings.Margins.Left,
                                                   pageSettings.Margins.Top, 
                                                   pageBounds.Width - (pageSettings.Margins.Left + pageSettings.Margins.Right), 
                                                   pageBounds.Height - (pageSettings.Margins.Top + pageSettings.Margins.Bottom));
 
            PrintPageEventArgs pageEvent = new PrintPageEventArgs(null, marginBounds, pageBounds, pageSettings);
            return pageEvent;
        }
 

        ///  
        ///  
        ///    When overridden in a derived class, begins the control sequence of when and how to print a document.
        ///  
        public virtual void OnStartPrint(PrintDocument document, PrintEventArgs e) {
            IntSecurity.AllPrintingAndUnmanagedCode.Assert();
            modeHandle = document.PrinterSettings.GetHdevmode(document.DefaultPageSettings);
        } 

        ///  
        ///  
        ///    When overridden in a derived class, begins the control
        ///       sequence of when and how to print a page in a document. 
        /// 
        public virtual Graphics OnStartPage(PrintDocument document, PrintPageEventArgs e) {
            return null;
        } 

        ///  
        ///  
        ///    When overridden in a derived class, completes the control sequence of when and how
        ///       to print a page in a document. 
        /// 
        public virtual void OnEndPage(PrintDocument document, PrintPageEventArgs e) {
        }
 
        /// 
        ///  
        ///    When overridden in a derived class, completes the 
        ///       control sequence of when and how to print a document.
        ///  
        public virtual void OnEndPrint(PrintDocument document, PrintEventArgs e) {
            IntSecurity.UnmanagedCode.Assert();

            Debug.Assert(modeHandle != IntPtr.Zero, "modeHandle is null.  Someone must have forgot to call base.StartPrint"); 
            SafeNativeMethods.GlobalFree(new HandleRef(this, modeHandle));
            modeHandle = IntPtr.Zero; 
        } 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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PrintController.cs source code in C# .NET

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