VISUAL BASIC CONTROL FUNDAMENTALS in .NET framework

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Shape2.FillStyle is set to 1, causing the left circle to appear gray and the right circle to appear red. This test will be carried
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out at the beginning of every interval, resulting in the colors alternating between circles from one interval to the next. Notice that the timer interval setting is not set within this event procedure. The Go button activates the metronome. Hence, Command1_Click converts the value entered in the text box to a number and assigned to the variable Tempo. This is followed by an If-Then-Else block that tests to see if the entered value is out or range (less than 40 beats per minute or greater than 220 beats per minute). If so, an error message appears, the text box is cleared, and the user if offered another opportunity to enter a valid value. Otherwise, the timer interval is determined (in terms of the number of milliseconds per interval), and the timer is enabled. The Stop button allows the user to stop the metronome, set another tempo and restart. Hence, Command2_Click clears the text box and disables the timer. On the other hand, the End button is used to terminate the computation. Hence, Command3_Click contains only an End statement. Here are the various event procedures.
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Private Sub Timer1_Timer() 'Beep If (Shape1.FillStyle = Shape1.FillStyle = Shape2.FillStyle = Else Shape1.FillStyle = Shape2.FillStyle = End If End Sub
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Private Sub Command1_Click() Dim Tempo As Single Tempo = Val(Text1.Text) If (Tempo < 40 Or Tempo > 220) Then 'Tempo out of range Beep Text1.Text = "" MsgBox ("Tempo out of Range - Please Try Again") Exit Sub End If Timer1.Interval = 60 * (1000 / Tempo) Timer1.Enabled = True End Sub Private Sub Command2_Click() Text1.Text = "" Timer1.Enabled = False End Sub Private Sub Command3_Click() End End Sub
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When the program is executed, the circles will alternate in color every half second (120 beats per minute). The action is initiated by entering the value 120 in the text box and then clicking on the Go button, as shown in Fig. 4.40.
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4.15 SCROLL BARS Scroll bars can be used to view a large document by moving the visible window (scrolling) vertically or horizontally. They can also be used to select a particular value within a specified range, or to select a specific item from a list. Visual Basic supports both horizontal and vertical scroll bars. They both work the same way.
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VISUAL BASIC CONTROL FUNDAMENTALS
Fig. 4.40 A scroll bar consists of a slide area enclosed by an outward-pointing arrow button at each end, as illustrated in Fig. 4.41. The slide area contains a button (called the thumb ) that can be dragged within the slide area. The location of the thumb within the slide area determines the portion of the document being viewed, the value being selected, etc. Thus, in a horizontal scroll bar, dragging the thumb to the leftmost portion of the slide area permits the leftmost portion of a document to be viewed, or the lowest value to be selected within a range, and so on.
Arrow Button Thumb Arrow Button Slide Area
Fig. 4.41 A Horizontal Scroll Bar There are two other ways to move the thumb within a scroll bar. You can click on the empty slide area, on either side of the thumb. Or you can click on an arrow button at the end of the scroll bar. Each click will produce an incremental movement in the indicated direction. Clicking on the slide area usually results in greater movement than clicking on an arrow button. The magnitudes of the various movements will be determined by the values assigned to certain scroll bar properties. The most important properties associated with scroll bars are Min, Max, SmallChange and LargeChange. Min and Max represent integer values corresponding to the minimum and maximum thumb locations within the slide area. The defaults are Min = 0 and Max = 32767, though these values can be altered at design time or while the program is executing. The values assigned to Min and Max must always fall within the interval 0 to 32767, and Min must always be assigned a value less than Max. SmallChange and LargeChange indicate the size of the incremental movements when you click on the arrow buttons or the empty slide area, respectively. Each has a default value of 1, and each can be reassigned a value between 1 and 32767. The larger the value, the greater the movement resulting from a single click. Typically, SmallChange is assigned a smaller value than LargeChange, though this need not always be true. (If you assign SmallChange a value greater than that assigned to LargeChange, a click on an arrow button will result in a larger change than a click on the empty slide area.)
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