Computer Programming Concepts and Visual Basic David I. Schneider

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300 Computer Programming Concepts and Visual Basic [Run and move the thumbs on the scroll bars.] In Example 5, when you drag the thumb, the face does not move until the dragging is completed. This can be corrected by adding the following two event procedures. Private Sub hsbXPos_Scroll() lblFace.Left = hsbXPos.ValueEnd SubPrivate Sub vsbY- Pos_Scroll() lblFace.Top = vsbYPos.ValueEnd Sub THE TIMER CONTROL The timer control, which is invisible during run time, triggers an event after a specified amount of time. The length of time, measured in milliseconds, is set with the Interval property to be any number from 0 to 65,535 (about 1 minute and 5 seconds). The event triggered each time Timer1.Interval milliseconds elapses is called Timer1_Timer( ). In order to begin timing, a timer must first be turned on by setting its Enabled property to True. A timer is turned off either by setting its Enabled property to False or by setting its Interval property to 0. The standard prefix for the name of a timer control is tmr. EXAMPLE 6 The following program creates a stopwatch that updates the time every tenth of a second. Object Property Setting frmWatch Caption Stopwatch cmdStart Caption Start lblSeconds Caption Seconds lblTime Caption (blank) cmdStop Caption Stop tmrWatch Interval 100 Enabled False Private Sub cmdStart_Click() lblTime.Caption = “ 0” ‘Reset watch tmrWatch.Enabled = True End Sub Private Sub cmdStop_Click() tmrWatch.Enabled = False End Sub Private Sub tmrWatch_Timer() lblTime.Caption = Str(Val(lblTime.Caption) + .1) End Sub [Run, click on the Start button, wait 10.8 seconds, and click on the Stop button.]
THE SHAPE CONTROL The shape control assumes one of six possible predefined shapes depending on the value of its Shape property. Figure 10-5 shows the six shapes and the values of their corresponding Shape properties. Shapes are usually placed on a form at design time for decoration or to highlight certain parts of the form. By convention, names of shape controls have the prefix shp. FIGURE 10-5 The Six Possible Shapes for a Shape Control The most useful properties of shapes are BackStyle (transparent vs. opaque; see Figure 10-6), BorderWidth (thickness of border), BorderStyle (solid, dashed, dotted, etc.), BackColor (background color), FillStyle (fill-in pattern: horizontal lines, upward diagonal lines, etc., as in Figure 9.20), FillColor (color used by FillStyle), and Visible. FIGURE 10-6 Effect of the Value of the BackStyle Property Nine Elementary Controls 301 Figure 10-7 shows several effects that can be achieved with shapes. In the first effect, a command button is set off by placing it on top of a rounded rectangle shape whose BackStyle is opaque, BackColor is blue, FillStyle is downward diagonal, and FillColor is yellow. In the second effect, the TRFFC20.ICO icon (displayed in an appropriately sized, borderless picture box) is “framed” by placing it on top of an oval shape whose BackStyle is opaque and Back- Color is the same as the background color of the icon. In the last effect, two command buttons are tied together by surrounding them with a circle shape whose FillStyle is transparent, BorderWidth is 8, and BorderColor is green, and by placing behind the command buttons an oval shape whose FillStyle is transparent, BorderWidth is 3, and BorderColor is blue.
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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 258 and 259: 250 Computer Programming Concepts a
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 307: hsbBar.Value changes accordingly. T
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 319 and 320: Clipboard.Clear deletes the content
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Page 333 and 334: 9. Click on the down arrow to the r
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Page 339 and 340: mary key. Databases of student enro
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Page 351 and 352: Creating and Designing Databases 34
Page 353 and 354: 9. When all fields have been specif
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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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