Q139388: HOWTO: Create a Thermometer Bar in Visual FoxPro

Article: Q139388
Product(s): Microsoft FoxPro
Version(s): 
Operating System(s): 
Keyword(s): kbcode kbnokeyword kbvfp300 kbvfp500 kbvfp600
Last Modified: 12-AUG-1999

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The information in this article applies to:

- Microsoft Visual FoxPro for Windows, versions 3.0, 5.0, 6.0 
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SUMMARY
=======

Windows-based applications often use a thermometer bar to represent the progress
of a certain task visually. This article shows by example how to create a
general-purpose thermometer bar that you can use in new or existing Visual
FoxPro applications.

MORE INFORMATION
================

For this example, a timer is used to simulate a process. At regular intervals,
the thermometer bar is updated to indicate the percentage of completion.

Step-by-Step Example
--------------------

1. Create a new program that contains the following code:

     PUBLIC othermometer
     othermometer = CreateObject('thermometer')
     othermometer.Visible = .T.

     DEFINE CLASS thermometer AS form

             Height = 73
             Width = 385
             DoCreate = .T.
             AutoCenter = .T.
             Caption = ""
             Closable = .F.
             ControlBox = .F.
             MaxButton = .F.
             MinButton = .F.
             Movable = .F.
             Name = "Form1"

         ADD OBJECT shape2 AS shape WITH ;
             Height = 25, ;
             Left = 24, ;
             Top = 24, ;
             Width = 336, ;
             Name = "Shape2"

         ADD OBJECT shape1 AS shape WITH ;
             BackColor = RGB(0,0,255), ;
             Height = 25, ;
             Left = 24, ;
             Top = 24, ;
             Width = 0, ;
             Name = "Shape1"

         ADD OBJECT timer1 AS timer WITH ;
             Top = 0, ;
             Left = 0, ;
             Height = 23, ;
             Width = 23, ;
             Interval = 100, ;
             Name = "Timer1"

         PROCEDURE timer1.Timer
             IF This.Parent.shape1.Width<336
                This.Parent.shape1.Width=This.Parent.shape1.Width+2
             ELSE
                WAIT WINDOW 'Finished!'
                Thisform.Release
             ENDIF
         ENDPROC

     ENDDEFINE

2. Run the program. The thermometer bar form should display, and the thermometer
  bar should progress at a constant rate until it finishes.

Another Example
---------------

The previous example uses a timer to simulate a process. This example
demonstrates how to implement this thermometer bar in a loop. The WAIT TIMEOUT
command inside the loop represents where the developer would place code
appropriate for the application.

The overall width of the thermometer bar is 300 pixels. Because the code in the
loop is executed 100 times, the width of the thermometer is incremented 3 pixels
at a time to achieve an overall thermometer bar width of 300 pixels. This
incremental value will vary depending on the number of times through the loop.

     PUBLIC othermometer
     othermometer = CreateObject('thermometer')
     othermometer.Visible = .T.

     i=0
     SET CONSOLE OFF

     DO WHILE i<100
        WAIT TIMEOUT 1        && Place application-specific code here
        othermometer.update()
        i=i+1
     ENDDO

     WAIT WINDOW 'Finished'

     othermometer.Release

     DEFINE CLASS thermometer AS form

             Height = 73
             Width = 349
             DoCreate = .T.
             AutoCenter = .T.
             Caption = ""
             Closable = .F.
             ControlBox = .F.
             MaxButton = .F.
             MinButton = .F.
             Movable = .F.
             Name = "Form1"

         ADD OBJECT shape2 AS shape WITH ;
             Height = 25, ;
             Left = 24, ;
             Top = 24, ;
             Width = 300, ;
             Name = "Shape2"

         ADD OBJECT shape1 AS shape WITH ;
             BackColor = RGB(0,0,255), ;
             Height = 25, ;
             Left = 24, ;
             Top = 24, ;
             Width = 0, ;
             Name = "Shape1"

         ADD OBJECT timer1 AS timer WITH ;
             Top = 0, ;
             Left = 0, ;
             Height = 23, ;
             Width = 23, ;
             Interval = 100, ;
             Name = "Timer1"

         PROCEDURE update
            This.shape1.Width=This.shape1.Width+3
         ENDPROC

     ENDDEFINE

Additional query words:

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Keywords          : kbcode kbnokeyword kbvfp300 kbvfp500 kbvfp600 
Technology        : kbVFPsearch kbAudDeveloper kbVFP300 kbVFP500 kbVFP600
Issue type        : kbhowto

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