VISUAL BASIC CONTROL FUNDAMENTALS in VS .NET

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VISUAL BASIC CONTROL FUNDAMENTALS
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4.56 Create a Visual Basic project that utilizes the timer control to display a digital clock. To do so, you may use either of the following two strategies: (a) (b) Assign the Format function with the Now argument (see Example 4.3) to a label caption within the timer event procedure. Assign the Time function to the label caption within the timer event procedure.
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4.57 Create a Visual Basic stop watch that utilizes the timer control. Include command buttons to start and stop the timing. Hint: Assign the current value of Now to the user-defined variable StartTime at the beginning of the process. Then display the difference between Now and StartTime at the end of the process. 4.58 Create a Visual Basic alarm clock that utilizes the timer control. Use option buttons to turn the alarm on and off. Specify the wake-up time using one of the following two controls: (a) (b) A text box A scroll bar
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Menus and Dialog Boxes
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5.1 BUILDING DROP-DOWN MENUS
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Drop-down menus represent another important class of components in the user interface, complementing, and in some cases replacing, the Visual Basic controls described in Chap. 4. A drop-down menu will descend from the menu heading (i.e., the name displayed in the main Menu Bar) when the user clicks on the menu heading.
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EXAMPLE 5.1 BUILDING DROP-DOWN MENUS
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Fig. 5.1 shows a main Menu Bar with three menu names: Continents, Oceans and Seas. Clicking on Continents causes the corresponding drop-down menu to appear, as shown in the figure. Dragging the mouse over one of the items within the drop-down menu will then cause that item to be highlighted.
Fig. 5.1 A drop-down menu To create a drop-down menu, click on the Menu Editor button in the Toolbar (see Fig. 5.2), or select Menu Editor from the Tools menu. Note that the Menu Editor is not accessible from the Visual Basic Toolbox.
Menu Editor Button
Fig. 5.2 The Standard Toolbar The Menu Editor will then appear, as shown in Fig. 5.3. The check boxes labeled Enabled and Visible should be selected, as shown in the figure.
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MENUS AND DIALOG BOXES
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Fig. 5.3 The Menu Editor You then enter identifiers for the Caption and Name for each menu item. (The Caption is actually the screen name of the item, as it appears in the Menu Bar or within the drop-down menu. The Name is used only in Visual Basic code it is not displayed when the application is running.) The Caption will appear in the large area at the bottom of the Menu Editor as well as within the Caption field. You may either press the Enter key or click on the Next button after the information has been entered for each menu item. All of the menu components must be entered, in the following order: 1. 2. 3. 4. The first menu heading (i.e., the screen name for the first menu, which appears in the menu bar). The corresponding menu items for the first menu. The second menu heading. The corresponding menu items for the second menu.
and so on. (The order of the components can be altered after they have been entered if they are not correct initially.) The menu headings must be flush left within each line. Items that appear within each menu must be indented one level, as indicated by four ellipses preceding each item. The indentation is accomplished using the right-arrow button. Click once to indent one level (four ellipses). The opposite action, i.e., moving an indented item to the left, is accomplished with the left-arrow button. The relative ordering of each menu component can be altered using the up- and down-arrow buttons. Thus, to move an entry ahead of the two preceding entries, highlight the entry to be moved and click on the up-arrow button twice. In addition, a menu component can be inserted by highlighting the item that will appear below the insertion, and clicking on the Insert button. Similarly, a menu component can be deleted by highlighting the component and clicking on the Delete button. Remember that it is the indentation pattern that distinguishes the menu heading from the corresponding items in the drop-down menu. Also, it is the order of the entries that distinguishes one set of menu components from another. (This may sound more complicated than it really is, as shown in the following example.)
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