PrintController.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Printing / PrintController.cs / 1305376 / 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;
    using System.Runtime.Versioning; 
 
    /// 
    ///  
    ///    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. 
        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)]
        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.
        /// 
        [ResourceExposure(ResourceScope.Process)] 
        [ResourceConsumption(ResourceScope.Process)]
        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.
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PrintController.cs source code in C# .NET

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