Computer Programming Concepts and Visual Basic David I. Schneider

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298 Computer Programming Concepts and Visual Basic EXAMPLE 4 The following program allows the user to select the text size in a text box. The three option buttons have been attached to the frame with the single-click-draw technique. Private Sub opt12pt_Click() txtInfo.Font.Size = 12 End Sub Private Sub opt18pt_Click() txtInfo.Font.Size = 18 End Sub Private Sub opt24pt_Click() txtInfo.Font.Size = 24 End Sub Object Property Setting frmSize Caption Change Size fraFontSize Caption Font Size opt12pt Caption &12 opt18pt Caption 1&8 opt24pt Caption &24 txtInfo Text Hello [Run, and click on the last option button (or press Alt+2).] A single form can have several groups of option buttons. However, each group must be attached to its own frame or picture box, or to the form itself. THE HORIZONTAL AND VERTICAL SCROLL BAR CONTROLS Figure 10-4 shows the two types of scroll bars. When the user clicks on one of the arrow buttons, the thumb moves a small amount toward that arrow. When the user clicks between the thumb and one of the arrow buttons, the thumb moves a large amount toward that arrow. The user can also move the thumb by dragging it. The main properties of a scroll bar control are Min, Max, Value, SmallChange, and LargeChange, which are set to integers. At any time, hsbBar.Value is a number between hsbBar.Min and hsbBar.Max determined by the position of the thumb. If the thumb is halfway between the two arrows, then hsbBar.Value is a number halfway between hsbBar.Min and hsbBar.Max. If the thumb is near the left arrow button, then hsbBar.Value is an appropriately proportioned value near hsbBar.Min. When an arrow button is clicked, hsbBar.Value changes by hsbBar.SmallChange and the thumb moves accordingly. When the bar between the thumb and one of the arrows is clicked, hsbBar.Value changes by hsbBar.LargeChange and the thumb moves accordingly. When the thumb is dragged,
hsbBar.Value changes accordingly. The default values of Min, Max, SmallChange, and LargeChange are 0, 32767, 1, and 1, respectively. However, these values are usually reset at design time. Note: The setting for the Min property can be a number greater than the setting for the Max property. The Min property determines the values for the left and top arrows. The Max property determines the values for the right and bottom arrows. FIGURE 10-4 Horizontal and Vertical Scroll Bars The Change event is triggered whenever an arrow or bar is clicked, or after the thumb has been dragged. The Scroll event is triggered whenever the thumb is being dragged. EXAMPLE 5 The following program uses scroll bars to move a smiling face around the form. The face is a large Wingdings character J inside a label. The values lblFace.Left and lblFace.Top are the distances in twips of the label from the left side and top of the form. (When printing, 1440 twips equal one inch; on the screen, 1440 twips are more or less an inch.) Private Sub hsbXPos_Change() lblFace.Left = hsbXPos.Value End Sub Private Sub vsbYPos_Change() lblFace.Top = vsbYPos.Value End Sub Object Property Setting frmFace Caption Smiling Face hsbXPos Min 0 Max 3000 SmallChange 100 LargeChange 500 Value 0 vsbYPos Min 500 Max 3000 SmallChange 100 LargeChange 500 Value 500 lblFace Caption J Font Wingdings Font Size 24 Left 0 Top 500 Nine Elementary Controls 299
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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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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 301 and 302: Private Sub cmdDisplay_Click() picF
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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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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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