BUILDING THE USER INTERFACE LAYER in Visual Studio .NET

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In addition to event handlers, you may want to add other standard code to the base form class You can then call this code from any of the derived forms For example, suppose you have a requirement to display a title on each of the forms of your application with a standard look The title lists the logical name of the form along with the name of the particular item that was selected on the form, as shown in Figure 47
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Figure 47 The title bar text for the ProductWin form displays the name of the form, along with the name of the particular product that was selected for edit
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Building the User Interface Layer
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NOTE: If you are not a Lord of the Rings fan, you may not know that Mithril is a fictional silver-like substance that can be used to make very strong chain mail garments The Mithril Coat is the small shirt of mail given to Frodo by Bilbo, his uncle
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You could add code in each form to display the title bar text But inevitably the user will decide that the title should be formatted differently, such as with a colon (Product Management: Mithril Coat) or with parentheses (Product Management (Mithril Coat)) You would then need to modify every form By putting the code in the base form class, you can modify the format of the title bar text in one place and have it appear consistently with that format in every form that inherits from the base form class For example, a method in the base form class that formats the title bar text is as follows:
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#Region " SetFormTitle" ''' <summary> ''' Formats the text in the window's title bar ''' </summary> ''' <param name="ItemTitle">Name of the selected item</param> ''' <remarks>The current window text may already have an item ''' displayed with it if so remove it</remarks> Protected Sub SetFormTitle(ByVal itemTitle As String) Dim separator As String = " - " Dim windowText As String = MeText If MeTextContains(separator) Then windowText = windowTextRemove( _ MeTextIndexOf(separator)) End If If StringIsNullOrEmpty(itemTitle) Then MeText = windowText Else MeText = windowText & separator & itemTitle End If End Sub #End Region
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Notice that this method is declared with the Protected keyword Protected de nes that only this form and forms that inherit from this base form can call this method The reference to Me in this method refers to the currently running instance, which is the instance of the derived form that inherits from this base form class
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NOTE: The IsNullOrEmpty method is new in the NET 20 Framework
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This method cannot be called automatically like the Enter and Leave events because the event that signals a change to this text may not be consistent in all the derived forms In this example, you would call it from the SelectedValueChanged event for the Product ComboBox control and when the user created a new product Add this line of code in each form whenever you need to change the title bar text:
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MyBaseSetFormTitle(newItemText)
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MyBase refers to the base form class At runtime, the system looks for the SetFormTitle method in the base form class If it is not found, it looks
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for it in the next class up the inheritance hierarchy until the method is found If you later need to change the format of the title, you can change it in the base form class and the modi cation is re ected at runtime in all forms that inherit from this base form class By building a base form class and inheriting from it for every form in your application, you attain consistent user interface behavior throughout your application As you later need to change the behavior of the user interface, you can change it in one place and have the change re ected in every form that inherits from the base form class
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