Win32 Applications in Visual Studio .NET

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Win32 Applications
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In general, you might not know in advance how many controls you re going to create dynamically when you write the code portion of the application. For example, you might want to create all the controls on a form to match the structure of a database table or an SQL query typed by the end user. For this reason, most of the time you can t create the appropriate number of WithEvents variables to trap events from the controls you add dynamically, and you must use the AddHandler command instead. I ve prepared a demo form that asks the user for a number of TextBox controls, creates them dynamically, and traps a few key events from them. (See Figure 15-14.) This is the code behind the Button control:
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Private Sub btnCreateControls_Click(ByVal sender As Object, _ ByVal e As EventArgs) Handles btnCreateControls.Click Dim answer As String
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answer = InputBox( How many controls ", Dynamic Control Creation", 5 )
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If answer = Then Exit Sub
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For index As Integer = 1 To CInt(answer) Create the Nth text box. Dim tb As New TextBox() tb.Size = New System.Drawing.Size(400, 30) tb.Location = New System.Drawing.Point(50, 40 + index * 40) We need this to identify the control. tb.Name = TextBox # & CStr(index) Add to the Controls collection. Me.Controls.Add(tb) Create event handlers. AddHandler tb.KeyPress, AddressOf TextBox_KeyPress AddHandler tb.TextChanged, AddressOf TextBox_TextChanged AddHandler tb.MouseEnter, AddressOf TextBox_MouseEnter AddHandler tb.MouseLeave, AddressOf TextBox_MouseLeave Next End Sub Private Sub TextBox_TextChanged(ByVal sender As Object, ByVal e As EventArgs) Show that an event fires by updating a Label control. lblStatus.Text = TextChanged in & CType(sender, TextBox).Name End Sub ...(Code for other event procedures omitted)...
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As you see in the TextBox_TextChanged procedure, assigning a value to the Name property makes it easier to detect which specific control raised the event.
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15:
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Figure 15-14 A form that creates a group of TextBox controls at run time and traps events from them
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One last note about control creation: you can destroy any control on a form by using the Remove method of the form s Controls collection. This method can remove any control, not just those that you ve added after the form became visible:
Me.Controls.Remove(btnOk)
Menus
Personally, I have always disliked the Visual Basic menu editor, and above all I m both ered by the fact that this designer hasn t evolved in six language versions. (And I m in good company if the comments I ve heard for years at conferences and user group meetings are any indication.) The good news is that the Windows Form designer now lets you create the menu structure of your applications using a more streamlined approach in a WYSIWYG editor. You can even move elements and entire submenus using drag-and-drop.
Creating a Menu Structure
The first step in creating a menu structure is to drag a MainMenu object from the Toolbox to the form designer. Because this object is invisible at run time, a new element named MainMenu1 appears in the designer s component tray area. You can change the name of this control if you want, but usually there s no point in doing so because most forms have only one menu structure and you don t need multiple MainMenu objects on a given form.
Part IV:
Win32 Applications
You can now click the menu bar and type the captions of menu items. (See Figure 15-15.) Depending on where you start typing, you can create new items on the menu bar, new submenus, or new menu items. Each item you create is automatically assigned a name such as MenuItem1, MenuItem2, and so on but you can edit these names by right-click ing the menu structure and selecting Edit Names on the shortcut menu (see Figure 15-16). When in Edit Names mode, you can edit the item names but can t modify their captions. The pop-up menu also lets you insert new items and delete existing ones. (You can also delete items by pressing the Delete key.) Regardless of whether you re in Edit Names mode, you can see and modify all the attributes of the current menu item in the Properties window.
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