Code:
/ DotNET / DotNET / 8.0 / 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; ////// /// 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 ///Controls how a document is printed. ////// /// protected PrintController() { IntSecurity.SafePrinting.Demand(); } ////// Initializes a new instance of the ///class. /// /// /// 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; } ////// This is new public property which notifies if this controller is used for PrintPreview. /// ////// /// 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 document. ////// /// public virtual Graphics OnStartPage(PrintDocument document, PrintPageEventArgs e) { return null; } ///When overridden in a derived class, begins 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 page in 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.When overridden in a derived class, completes the /// control sequence of when and how to print a document. ///
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