Building the User Interface Layer in .NET

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Building the User Interface Layer
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NOTE: Care must be taken when using Pen and Brush objects because they are unmanaged resources That means that the NET Framework does not manage them Specifically, it does not automatically handle the dispose of the objects You must be careful and ensure that you dispose of any unmanaged objects when you are finished with them
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TableLayoutPanel control on the splash screen form
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The following code draws a red rectangle within the borders of a
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Private Sub DetailsLayoutPanel_Paint(ByVal sender As Object, _ ByVal e As SystemWindowsFormsPaintEventArgs) _ Handles DetailsLayoutPanelPaint Using redPen As New Pen(ColorFirebrick) redPenWidth = 40F redPenLineJoin = Drawing2DLineJoinBevel eGraphicsDrawRectangle(redPen, _ New Rectangle(2, 2, DetailsLayoutPanelWidth - 4, _ DetailsLayoutPanelHeight - 4)) End Using End Sub
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The rst line of code uses the Using statement, which marks the beginning of a Using block A Using block provides assistance in managing object instances, particularly those containing unmanaged resources such as le handles, COM wrappers, SQL connections, and drawing objects The rst line of the Using block acquires the resource, basically creating a variable and initializing it to the appropriate system resource The code within the Using block then uses the resource as needed The End Using statement automatically disposes of the resources de ned in the Using statement The Using block is similar to a Try/Finally construct in that the End Using statement always executes, even if an unhandled exception occurs The bene t of using a Using block is that unmanaged resources are appropriately acquired, used, and disposed
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NOTE: To use the Using statement with object instances from your classes, you must implement IDisposable in your class See 5 for more information on IDisposable
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Additional User Interface Techniques
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In this sample code, the Using block acquires a reddish Pen object Code within the Using block sets the Pen s attributes In this case, the code sets the Width and LineJoin properties The LineJoin property de nes the style for the areas in which the lines are connected The PaintEventArgs Graphics object is used to draw the graphic in this case, a rectangle Parameters of the DrawRectangle method allow you to de ne the rectangle s top-left corner, width, and height The End Using statement then disposes of the Pen object
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NOTE: The Paint event is raised many times during the execution of your application So ensure any code in the Paint event performs well
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4 BUILDING THE USER INTERFACE LAYER
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Since the graphics are drawn with code, they do not appear on the form until you run the application The result is shown in Figure 411
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The rectangle around the Version and Copyright information was drawn using the code described in this section
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Draw graphics anywhere on your forms where you want to add some visual effects or draw the user s attention
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Printing
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Tools provided with Visual Studio and third-party products can help you build and print reports But what if the users just want to print the contents of their forms A new method in the NET Framework makes printing forms relatively easy
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Building the User Interface Layer
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If you implemented your MDI parent form using the MDI Parent Form template, you already have Print, Print Preview, and Print Setup options on the File menu and Print and Print Preview icons on the toolbar You can either remove the options and icons or write code to support them This section provides the code you need to implement them
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Implementing Printing
There may be times when a user wants a quick printed copy of a form Implementing a Print feature in your application could be very useful To implement printing: 1 Ensure that there is a way for the user to select to print a form If you used the MDI Parent Form template, a menu option and toolbar icon for printing already exist Otherwise, you can add a menu option, toolbar icon, or button to provide for printing 2 Add the PrintDocument control to the form from which the user initiates the printing process If you have an MDI parent form, add the PrintDocument control to the MDI parent Otherwise, add it to whichever form controls the printing The PrintDocument control is a component that you use to print text or graphics within a Windows application Give the control a logical name, such as PTPrintDocument 3 In the event handler for the control that initiates printing, write the line of code required to begin the printing process Printing occurs by calling the Print method of the PrintDocument control, as follows:
PTPrintDocumentPrint()
This generates the PrintPage event for the PrintDocument control 4 Add code to the PrintPage event handler for the PrintDocument control to de ne what to print It is this last step that is a bit more work Printing the current form requires that you rst de ne a rectangle that is the size of the form, and then de ne a bitmap that is the size of the form, and nally draw the form as a bitmap using the rectangle to de ne the amount of the form to draw