PrintPreviewGraphics.cs source code in C# .NET

Source code for the .NET framework in C#

                        
Code:

                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / CommonUI / System / Drawing / Printing / PrintPreviewGraphics.cs / 1305376 / PrintPreviewGraphics.cs
                        

                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

 
namespace System.Drawing { 
    using System.Runtime.InteropServices;
    using System.ComponentModel; 
    using System.Diagnostics;
    using System;
    using Microsoft.Win32;
    using System.Security; 
    using System.Security.Permissions;
    using System.Drawing.Internal; 
    using System.Drawing.Imaging; 
    using System.Drawing.Text;
    using System.Drawing.Drawing2D; 
    using System.Drawing.Printing;
    using System.Runtime.Versioning;

    ///  
    /// 
    ///     Retrives the printer graphics during preview. 
    ///  
    internal class PrintPreviewGraphics  {
 

         private PrintPageEventArgs printPageEventArgs;
         private PrintDocument printDocument;
 
         public PrintPreviewGraphics(PrintDocument document, PrintPageEventArgs e) {
             printPageEventArgs = e; 
             printDocument = document; 

         } 

        /// 
        /// 
        ///     Gets the Visible bounds of this graphics object. Used during print preview. 
        /// 
        public RectangleF VisibleClipBounds { 
            [ResourceExposure(ResourceScope.None)] 
            [ResourceConsumption(ResourceScope.Process, ResourceScope.Process)]
            get { 
                IntPtr hdevMode = printPageEventArgs.PageSettings.PrinterSettings.GetHdevmodeInternal();

                using( DeviceContext dc = printPageEventArgs.PageSettings.PrinterSettings.CreateDeviceContext(hdevMode)) {
                    using( Graphics graphics = Graphics.FromHdcInternal(dc.Hdc) ) { 
                        if (printDocument.OriginAtMargins) {
 
                            // Adjust the origin of the graphics object to be at the user-specified margin location 
                            // Note: Graphics.FromHdc internally calls SaveDC(hdc), we can still use the saved hdc to get the resolution.
                            int dpiX = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(dc, dc.Hdc), SafeNativeMethods.LOGPIXELSX); 
                            int dpiY = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(dc, dc.Hdc), SafeNativeMethods.LOGPIXELSY);
                            int hardMarginX_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(dc, dc.Hdc), SafeNativeMethods.PHYSICALOFFSETX);
                            int hardMarginY_DU = UnsafeNativeMethods.GetDeviceCaps(new HandleRef(dc, dc.Hdc), SafeNativeMethods.PHYSICALOFFSETY);
                            float hardMarginX = hardMarginX_DU * 100 / dpiX; 
                            float hardMarginY = hardMarginY_DU * 100 / dpiY;
 
                            graphics.TranslateTransform(-hardMarginX, -hardMarginY); 
                            graphics.TranslateTransform(printDocument.DefaultPageSettings.Margins.Left, printDocument.DefaultPageSettings.Margins.Top);
                        } 

                        return graphics.VisibleClipBounds;
                    }
                } 
            }
        } 
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.

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