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Line Used to draw straight-line segments within forms. (See also the Shape tool description.) List Box Provides a collection of text items. One text item may be selected from the list at any time during program execution. Text items can be assigned initially, or they can be assigned during program execution. However, in contrast to a text box, the user cannot enter text items to a list box during program execution. (Note that a combo box combines the features of a list box and a text box). OLE Container Allows a data object to be transferred from another Windows application and embedded within the Visual Basic application. Option Button Provides a means of selecting one of several different options. Within a group of option buttons, one and only one can be selected. (See also the Check Box description.) Picture Box Used to display graphical objects or text, and to initiate event actions. (Note that a Picture Box is similar to an Image Box. It has more properties than an Image Box, though it redraws slower and cannot be stretched.) Pointer The pointer is not really a control tool, in the true sense of the word. When the pointer is active, the mouse can be used to position and resize other controls on the design form, and to double-click on the controls, resulting in a display of the associated Visual Basic code. Shape Used to draw circles, ellipses, squares and rectangles within forms, frames or picture boxes. (See also the Line tool description.)
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Text Box Provides a means of entering and displaying text. The text can be assigned initially, it can be reassigned during program execution, or it can be entered by the user during program execution. (See also the Label Box and the Combo Box descriptions.) Timer Allows events to occur repeatedly at specified time intervals. Vertical Scroll Bar Allows a vertical scroll bar to be added to a control (if a vertical scroll bar is not included automatically).
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4.2 CONTROL TOOL CATEGORIES The control tools can be grouped into the following overall categories: (Keep in mind that some control tools have multiple uses and are not restricted to the categories listed below.) Entering Text Text Box Combo Box Displaying Text Label Text Box List Box Combo Box Displaying Graphics Image Box Picture Box Frame Managing Files File List Box Drive List Box Directory List Box Initiating Events Command Button Executing Timed Events Timer Drawing Line Button Shape Button Selecting Among Alternatives Check Box Option Button Frame List Box
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4.3 WORKING WITH CONTROLS A control can be added to the Form Design Window two different ways: 1. 2. By clicking on the desired control tool within the Toolbox, then clicking on the control s location within the Form Design Window. By double-clicking on the desired control tool within the Toolbox, automatically placing the control at the center of the Form Design Window.
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A control can be relocated within the Form Design Window by dragging the control to its desired location (hold down the left mouse button and drag). A control can be resized within the Form Design Window by dragging one of its edges or corners. A control can be removed from the Form Design Window by highlighting the control (i.e., by clicking on it) and then pressing the Delete key.
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4.4 NAMING FORMS AND CONTROLS When an object (i.e., a form or control) is added to the Form Design Window, a generic default name (e.g.,
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Form1, List1, List2, Text1, etc.) is automatically assigned to that object. Each name includes a generic identifier
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(Form, List, Text, etc.) that identifies the type of object, followed by a number that identifies the order in which that particular object type has been added to the Form Design Window. Thus, List1 is the name of the first list box added to the Form Design Window, List2 is the name of the second list box, and so on. The default names work well for simple applications. For more complicated applications, however, it may be preferable to assign different names that suggest the purpose of each object. Thus, Students and Addresses may be preferable to List1 and List2. Microsoft suggests that such programmer-assigned names include a three-letter prefix suggesting the type of object. Hence, we might use lstStudents and lstAddresses rather than Students and Addresses, if each object is a list box. (The use of prefixes is unnecessary when the default names are used, since the names themselves indicate the object type.) Microsoft recommends the following prefixes for programmer-defined object names:
Object Combo Box Check Box Command Button Data Directory List Box Drive List Box File List Box Frame Form Horizontal Scroll Bar Image Box
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