BUILDING THE USER INTERFACE LAYER in .NET framework

Print QR in .NET framework BUILDING THE USER INTERFACE LAYER
4 BUILDING THE USER INTERFACE LAYER
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Implementing Print Setup
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Print setup allows the user to de ne the printer and other print settings before printing In some applications, the Print menu option provides this feature and the user must view this dialog every time printing is required In this example, the features are separated to give the user an easy way to print to the default printer without accessing the setup dialog Either way you prefer, this feature is easy to implement because it uses the same PrintDocument control and associated code required to implement the Print feature To implement a Print Setup feature: 1 Ensure that there is a way for the user to select a Print Setup This is most logically de ned near the Print option In some cases, the setup is handled in the Print option, and a separate Print Setup option is not desired 2 Add the PrintDialog control to the form from which the user initiates the Print Setup process This is normally the same form containing the PrintDocument control Give the control a logical name, such as PTPrintDialog 3 In the event handler for the control that initiates the Print Setup, write the code required to display the Print dialog The code involves associating the appropriate PrintDocument control with the Print dialog, displaying the Print dialog, and then, if the user clicked OK, printing the document as follows:
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4
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Building the User Interface Layer
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PTPrintDialogDocument = PTPrintDocument Dim oResult As DialogResult = PTPrintDialogShowDialog If oResult = WindowsFormsDialogResultOK Then PTPrintDocumentPrint() End If
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Building Along
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If you skipped the prior Building Along, you can skip this one as well without impacting any Building Along activities in later chapters If you want to implement print setup, for the Purchase Tracker sample application: Display the MDI parent form (PTMDIParentWin) in the Forms Designer and add the PrintDialog control Name it PTPrintDialog Add an event handler that handles the Click event for the Print Setup menu option Add the code defined in this section to associate the PrintDocument control with the Print dialog, show the dialog, and then print Run the application It displays your splash screen and then shows the MDI parent form Select Products | Manage Products to display the ProductWin form Select Purchase Tracker | Print Setup to display the Print dialog If you click the OK button, the ProductWin form is printed If you click the Cancel button, nothing is printed NOTE: If you access the Print Setup menu option when no active MDI child form is displayed, the application generates an error Handling exceptions is covered later in this chapter
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The topics in this section detailed how to print a form, including print preview and print setup features You can use these techniques to print the forms in your applications With some tailoring of the code in the PrintPage event handler, you can also use these techniques to print any information
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Handling Exceptions
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Stuff happens Network connections fail Users do the unexpected Things just don t always go as you had planned A production-quality application needs to anticipate the unexpected, the unknown possibilities, and the exceptional cases and react accordingly This is the purpose of exception prevention and handling in your application This section rst looks at some defensive development techniques It then details how to throw and catch exceptions and how to use a resource le for error text
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4 BUILDING THE USER INTERFACE LAYER
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Defensive Development
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Defensive development is a technique whereby you develop your application with a focus on defending each of your methods from harm This means that you tenaciously validate each incoming parameter, verify any required preconditions, and do whatever it takes to ensure proper execution of the method By spending the time implementing defensive development techniques while you are building the application, you may nd that you spend much less time on debugging and support of the application after it is deployed As an example, code in the event handler for the PrintPage event in the prior section generates an unhandled exception if the user does not open an MDI child form before selecting to print There are several ways you can defensively handle this situation:
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Modify the code that displays the menu so that the Print options are grayed out or hidden if no active MDI child form exists This approach is used often, but it has one key drawback When the options are grayed out, the user has no indication as to why, which could then prompt a support call Modify the code that handles the Click event for each of the Print options to check for an active MDI child form and display a message to the user if there is none This is a good approach because it defensively prevents a potential problem and allows the user to easily discover how to correct the problem Modify the code in the PrintPage event (or the method called by the PrintPage event) to check for an active MDI child form
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