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Fig. 4.35
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Fig. 4.36
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Fig. 4.37
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VISUAL BASIC CONTROL FUNDAMENTALS
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4.14 CREATING TIMED EVENTS (THE TIMER CONTROL) Applications involving timed events, such as a digital clock or a stopwatch, make use of the timer control (see Fig. 4.1). Like other controls, the timer is placed in the Form Design Window at design time. Its location and appearance are unimportant, because the timer itself does not appear when the program is executed. The values assigned to certain timer properties are critical, however, since they govern the functioning of the timed events. Of primary importance is the Interval property. This property can be assigned an integer value ranging from 0 to 65,535. A zero value disables the timer. Positive values represent the number of milliseconds between timed events. Thus, a value of 1 represents an interval of one millisecond (one thousandth of a second); 1000 represents a one-second interval; and 60,000 represents one-minute interval. The actual interval may be longer, however, because the frequency of timed events cannot exceed 18.2 per second (which corresponds to a minimum Interval value of 54.9). Furthermore, the interval may be longer if the system is relatively busy (i.e., if substantial computation is taking place within the interval). In addition, the Enabled property must be assigned a value of True in order to activate the timer. Setting Enabled to False disables the timer. This property may be assigned at design time and/or during program execution.
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EXAMPLE 4.12 TIMED EVENTS (A METRONOME)
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To illustrate the use of timed events, let us use the timer control to create a metronome. As you are probably aware, a metronome is an instrument used by musicians to maintain a specified tempo (i.e., a specified interval between beats). Commercial metronomes produce a distinct sound (a beep ), sometimes accompanied by a flashing light, to represent each beat. In this example we will use two flashing circles to represent the beat, because of the lengthy (and uncontrollable) sound produced by the Visual Basic Beep command. One circle will always be highlighted (shown in bright red) while the other will be shown in the gray background color. The red-gray combination will alternate at the specified tempo. We will restrict the tempo to values falling within the interval 40 220 beats per minute, as most music falls within this interval. We begin with the Form Design Window shown in Fig. 4.38. Note that clock enclosed by the square at the center of the Form Design Window. This is the timer control, whose name is Timer1. The left rectangle is Shape1, and the right rectangle is Shape2. These rectangles will be converted to circles, which will display the tempo by alternating in color. The command buttons will start and stop the metronome, and end the computation. The text box will specify the tempo.
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Fig. 4.38
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VISUAL BASIC CONTROL FUNDAMENTALS
We now resize the label, the text box and the command buttons, and assign the following initial values to the control properties. The results are shown in Fig. 4.39. Object Form1 Shape1 Property Caption Shape FillColor FillStyle Shape FillColor FillStyle Enabled Caption Font Caption Font Caption Font Caption Font Caption Font Value Metronome 3 (Circle) Red 1 (Transparent default value) 3 (Circle) Red 1 (Transparent default value) False Tempo (40-220): MS Sans Serif, 10-point (none) MS Sans Serif, 10-point Go MS Sans Serif, 10-point Stop MS Sans Serif, 10-point End MS Sans Serif, 10-point
Shape2
Timer Label1 Text1 Command1 Command2 Command3
Fig. 4.39
The next step is the creation of appropriate event procedures for the timer and the command buttons. The event procedure corresponding to the timer will consist of an If-Then-Else block that controls the alternating color display within the circles. Thus, if the FillStyle property of the leftmost circle (Shape1) is assigned a value of zero (indicating a transparent object, which will appear gray), then its value is set to 1 and the value of Shape2.FillStyle is set to 0. This will cause the left circle to appear red and the right circle to appear gray. Otherwise, Shape1.FillStyle is assigned a value of 0 and
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