Computer Programming Concepts and Visual Basic David I. Schneider

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294 Computer Programming Concepts and Visual Basic 10.2 NINE ELEMENTARY CONTROLS In this section, we discuss the nine controls indicated on the Toolbox in Figure 10-3. FIGURE 10-3 Nine Elementary Controls. THE FRAME CONTROL Frames are passive objects used to group related sets of controls for visual effect. You rarely write event procedures for frames. The preceding frame has a group of three text boxes attached to it. When you drag the frame, the attached controls follow as a unit. If you hide the frame, the attached controls will be hidden as well. A control must be attached to a frame in a special way. You cannot just double-click to create the control and then drag it into a frame. To attach a control to a frame, first create the frame. Next, single-click on the control icon to activate it, then move the mouse pointer inside the frame to the point where you want to place the upper-left corner of the control. Finally, drag the mouse to the right and down, and then release the mouse button when you are satisfied with the size of the control. This is referred to as the single-click-draw technique. A group of controls also can be attached to a picture box. The advantages of using frames are that they have a title sunk into their borders that can be set with the Caption property and that they cannot receive the focus. As shown later in this section, the frame control is particularly important when working with groups of option button controls. The standard prefix for the name of a frame is fra. THE CHECK BOX CONTROL A check box, which consists of a small square and a caption, presents the user with a yes/no choice. The form in Example 1 uses four check box controls. The Value property of a check box is 0 when the square is empty and is 1 when the square is checked. At run time, the user
clicks on the square to toggle between the unchecked and checked states. So doing also triggers the Click event. EXAMPLE 1 The following program allows an employee to compute the monthly cost of various benefit packages. Private Sub chkDrugs_Click() Call Tally End Sub Private Sub chkDental_Click() Call Tally End Sub Private Sub chkVision_Click() Call Tally End Sub Private Sub chkMedical_Click() Call Tally End Sub Private Sub Tally() Dim sum As Single If chkDrugs.Value = 1 Then sum = sum + 12.51 End If If chkDental.Value = 1 Then sum = sum + 9.68 End If If chkVision.Value = 1 Then sum = sum + 1.5 End If If chkMedical.Value = 1 Then sum = sum + 25.25 End If lblAmount.Caption = FormatCurrency(sum) End Sub [Run and then click on the desired options.] Object Property Setting Nine Elementary Controls 295 frmBenefits Caption Benefits Menu chkDrugs Caption Prescription Drug Plan ($12.51) Value 0 – Unchecked chkDental Caption Dental Plan ($9.68) Value 0 – Unchecked chkVision Caption Vision Plan ($1.50) Value 0 – Unchecked chkMedical Caption Medical Plan ($25.25) Value 0 – Unchecked lblTotal Caption Total monthly payment: lblAmount Caption $0.00
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Computer Programming Concepts and V
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CONTENTS SECTION 1: PROBLEM SOLVING
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13.3 WEB PAGE PROGRAMMING WITH VBSC
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S E C T I O N 1 PROBLEM SOLVING
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4 Computer Programming Concepts and
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10 Computer Programming Concepts an
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S E C T I O N 2 FUNDAMENTALS OF PRO
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3.1 SUB PROCEDURES, PART I Structur
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The second task performed by the ad
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‘The density (number of people pe
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"Hawaii", 1184000, 6471 "Alaska", 6
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dure by just using the variable in
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Call CalculateSum(x, y, s) Call Dis
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■ FORM-LEVEL VARIABLES Visual Bas
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3. In Appendix D, the section “St
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Private Sub cmdDetermine_Click() Di
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Private Sub cmdCompute_Click() Dim
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preceded with the word ByVal. Built
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It is clear from the hierarchy char
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The meaningful procedure names, alo
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FIGURE 3-9 Sample Run for Programmi
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4.1 RELATIONAL AND LOGICAL OPERATOR
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(a) (2 < n) And (n < 6) (b) (2 < n)
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SOLUTION: In the following program,
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The Else part of an If block can be
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picTax.Cls picTax.Print “Your FIC
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Case 4, 5 picOutcome.Print “You a
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EXAMPLE 3 The following program use
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Case Else picResult.Print “The st
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4. The items in the value list must
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The hierarchy chart in Figure 4-4 s
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‘Program to compute employees’
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Private Function TaxMarried(adjPay
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and tells us whether the food meets
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S E C T I O N 5 REPETITION
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132 Computer Programming Concepts a
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S E C T I O N 6 ARRAYS
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S E C T I O N 7 SEQUENTIAL FILES
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Page 251: S E C T I O N 8 RANDOM-ACCESS FILES
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Page 265: S E C T I O N 9 THE GRAPHICAL DISPL
Page 295 and 296: 10.1 LIST BOXES AND COMBO BOXES The
Page 297 and 298: Private Sub cmdAdd_Click() Dim item
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Page 309 and 310: THE SHAPE CONTROL The shape control
Page 311 and 312: FIGURE 10-9 A Picture Created with
Page 313 and 314: Rows 9 ScrollBars 0 - flexScrollBar
Page 315 and 316: Private Sub cmdQuit_Click() End End
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Page 351 and 352: Creating and Designing Databases 34
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9. When all fields have been specif
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Creating and Designing Databases 34
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TABLE 11.5(B) TABLE 11.5(C) course
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(a) Update the quantity field of th
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12.1 CLASSES AND OBJECTS noun A wor
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Task Statement Assign a value to a
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EXAMPLE 1 and then an instance of t
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[Run, enter the data for a student
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SOLUTION: Object Property Setting f
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4. Methods can be either Function o
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‘Student Class (CStudent) Private
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txtFinal.Text = “” picGrades.Pr
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■ EVENTS In the previous section
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frmCircles.ForeColor = vbRed ‘Mak
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Public Function X() As Integer X =
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End Sub Private Sub cmdDropBomb_Cli
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Next i End Sub Public Function Read
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Remove method. The number of object
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S E C T I O N 13 COMMUNICATING WITH
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A P P E N D I C E S
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APPENDIX C VISUAL BASIC STATEMENTS,
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CANCEL The Cancel property provides
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COLS and ROWS The Cols and Rows pro
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DEFINT, DEFLNG, DEFSNG, DEFDBL, DEF
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ENVIRON Visual Basic has an environ
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FONT.ITALIC or FONTITALIC These pro
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yields “1234.”, Format(1234000,
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the length of the string currently
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ISNUMERIC The value of the function
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Unlock statement is used to remove
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Focus Default Default Number First
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OR (Logical Operator) The logical e
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the same as in the original Dimensi
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SECOND The function Second extracts
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STRETCH When the Stretch property o
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UNLOCK The Unlock command is intend
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[COLOR]: Numbers written in base 16
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Appendix D 457
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466 Technology of the Internet D Da
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468 Technology of the Internet Rela
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470 Technology of the Internet 2. D
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SYSTEM REQUIREMENTS CD-ROM INSTRUCT
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Computer Programming Concepts and Visual Basic David I. Schneider

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