Other Drawing Options in Visual Studio .NET

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There are a few other drawing-related ControlStyles you may be interested in: // Drawing-related control styles enum ControlStyles { AllPaintingInWmPaint, // Collapse drawing phases into Paint event DoubleBuffer, // Don't show drawing until Paint event returns UserPaint, // Control that paints itself specially Opaque, // OnPaintBackground skipped, Paint draws all client area ResizeRedraw, // Invalidate entire client area on resize SupportsTransparentBackColor, // Simulated transparent controls } For example, it's common for controls that need double buffering to want to automatically redraw when they're resized For this, you use the ResizeRedraw style: public Form1() { // Required for Windows Form Designer support InitializeComponent(); // Double buffering thisSetStyle(ControlStylesDoubleBuffer, true); thisSetStyle(ControlStylesAllPaintingInWmPaint, true); thisSetStyle(ControlStylesUserPaint, true); // Redraw when resized thisSetStyle(ControlStylesResizeRedraw, true); } The ControlStyles settings apply at the point where WinForms starts wrapping the functionality of Windows itself, which is the Control base class (Forms ultimately derive from Control) Several of the ControlStyles settings have nothing to do with drawing but rather govern how the Control class interacts with the underlying operating system For more information, see the reference documentation for the ControlStyles enumeration [ Team LiB ]
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Ifs 4,5, and 6 haven't convinced you of NET's very rich support for drawing, then 7, on drawing to the printer, should do the trick [ Team LiB ]
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7 Printing
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Usually, drawing to the screen is pretty easy because screen settings are generally constant during the run of the application Drawing to a printer, on the other hand, is more complicated because users may change the printer or the printer settings many times, even for a single document Also, paper costs money and can't be sent through the printer twice (unless you don't care what's on the back), so before users print their documents they want to see what they will look like The actual drawing is largely the same for a printer as it is for the screen, but the printer settings are the interesting part, and the settings are covered in this chapter [ Team LiB ]
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Print Documents
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The basic unit of printing in WinForms is the print document A print document describes the characteristics of what's to be printed, such as the title of the document, and provides the events at various parts of the printing process, such as when it's time to print a page NET models the print document using the PrintDocument component from the SystemDrawing Printing namespace (and available on the VSNET Toolbox): class PrintDocument : Component, IComponent, IDisposable { // Constructors public PrintDocument(); // Properties public PageSettings DefaultPageSettings { get; set; } public string DocumentName { get; set; } public PrintController PrintController { get; set; } public PrinterSettings PrinterSettings { get; set; } // Events public event public event public event public event PrintEventHandler BeginPrint; PrintEventHandler EndPrint; PrintPageEventHandler PrintPage; QueryPageSettingsEventHandler QueryPageSettings;
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// Methods public void Print(); } The basic usage of a PrintDocument object is to create an instance, subscribe to at least the PrintPage event, call the Print method, and handle the PrintPage event: PrintDocument printDocument1; void InitializeComponent() { thisprintDocument1 = new PrintDocument(); thisprintDocument1PrintPage += new PrintPageEventHandler(thisprintDocument1_PrintPage); } void printButton_Click(object sender, SystemEventArgs e) { printDocument1DocumentName = fileName; printDocument1Print(); } void printDocument1_PrintPage(object sender, PrintPageEventArgs e) { // Draw to the printer Graphics g = eGraphics; using( Font font = new Font("Lucida Console", 72) ) { gDrawString("Hello,\nPrinter", font, ); } } The PrintPage event is triggered by a call to the PrintDocument object's Print method The PrintPage event is responsible for actually rendering the state of the document to the printer
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surface using the Graphics object The actual drawing is just like drawing on any other Graphics object, as discussed in s 4,5, and 6 Notice that this sample sets the DocumentName property of the document This string shows up in the queue for the printer so that the user can manage the document being printed [ Team LiB ]
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