HOWTO: Add a Check Box to a List in Visual FoxPro

• Microsoft Visual FoxPro for Windows, versions 5.0, 6.0

SUMMARY

If you click Toolbars on the View menu, the Toolbars dialog box appears, which allows you to manipulate check boxes from within a ListBox Control. This article illustrates how you can create this functionality using Visual FoxPro.

MORE INFORMATION

Use the following steps to create a ListBox control similar to the one in the Visual FoxPro Toolbars dialog box:

1. Create a form using the "CREATE FORM test" command. This example assumes that you have installed Visual FoxPro and all its components to the C:\Vfp directory, and this is what is returned by the VFP HOME() command. NOTE: this code uses both the Box.bmp and Checkbx.bmp files. In Visual FoxPro 6.0, these files are located in the following new locations:

   
         HOME(2)+ "tastrade\bitmaps\checkbx.bmp"
         HOME(2)+ "tastrade\bitmaps\box.bmp" 

   Please modify the code examples below when running this code in Visual FoxPro 6.0.



2. Add two new properties, NumLstItm and ItemSel[1], to the form. The first property holds the number of items you would like the ListBox control to display, and the second property keeps track of whether specific items in the ListBox control are selected(1) or not selected(0).



3. Right-click the form and click Properties on the Shortcut menu. This takes you to the Properties dialog box for the form.



4. Select the NumLstItm property from the All tab or the Other tab of the Property dialog box, and set it to the number of items you want to have in the ListBox control--for example, set NumLstItm to 5.



5. Add the following code to the INIT event of the form:

   
         DIMENSION ThisForm.ItemSel(ThisForm.NumLstItm)
         FOR i= 1 to ThisForm.NumLstItm
            ThisForm.ItemSel(i)=0
         endfor 




6. Add a ListBox control to the form with the following settings:

   
         MultiSelect = .F. - False
         Name = List1
         RowSourceType = 1 - Value
        RowSource = One,Two,Three,Four,Five 

   NOTE: Make sure that the NumLstItm property of the form is set to the same number as the number of items you have in the RowSource property of the ListBox control. For example, if the NumLstItm property of the form is set to 5, then the RowSource property of the ListBox control should contain 5 items separated by commas.



7. Add the following code to the INIT event of the ListBox control:

   
         This.Picture=HOME()+"samples\tastrade\bitmaps\box.bmp" 




8. Add the following code to the Click event of the ListBox:

   
      LPARAMETERS nButton, nShift, nXCoord, nYCoord
      IF LASTKEY()!= 5 AND LASTKEY() != 24
       IF ThisForm.ItemSel(This.ListItemID)=0
         This.Picture(This.ListItemID)=HOME()+ ;
         "samples\tastrade\bitmaps\checkbx.bmp"
         ThisForm.ItemSel(This.ListItemID)=1
       ELSE
        IF ThisForm.ItemSel(This.ListItemID)=1
   
      This.Picture(This.ListItemID)=HOME()+"samples\tastrade\bitmaps\box.bmp"
         ThisForm.ItemSel(This.ListItemID)=0
        ENDIF
       ENDIF
      ENDIF 

   When you run the form, the Icons of all the Items in the ListBox display an empty check box. With the above code, if you left-click an item, then the icon of the item changes to a Box with an "x" in it.



9. Add the following code to the KEYPRESS event of the ListBox:

   
     LPARAMETERS nKeyCode, nShiftAltCtrl
      IF nKeyCode=32
       IF ThisForm.ItemSel(This.ListItemID)=0
         This.Picture(This.ListItemID)=HOME()+ ;
         "samples\tastrade\bitmaps\checkbx.bmp"
         ThisForm.ItemSel(This.ListItemID)=1
       ELSE
        IF ThisForm.ItemSel(This.ListItemID)=1
   
      This.Picture(This.ListItemID)=HOME()+"samples\tastrade\bitmaps\box.bmp"
          ThisForm.ItemSel(This.ListItemID)=0
        ENDIF
       ENDIF
      ENDIF 

   With the above code if you press the space bar, the Icon of the highlighted Item toggles between an empty check box and a check box with an "x" in it.



10. Create a command button and set its caption to "List of Selected Items." Add the following code to the click event of the button:

    
        isel=""
        FOR i = 1 TO ThisForm.NumLstItm
           IF ThisForm.ItemSel(i)=1
               if i = 1
                  isel = isel + ThisForm.List1.ListItem(i)
               ELSE
                  isel = isel + ";  " + ThisForm.List1.ListItem(i)
               endif
           ENDIF
        ENDFOR
        WAIT WINDOW isel 

Additional query words:

Keywords : kbnokeyword kbVFp500 kbVFp600
Version :
Platform :
Issue type : kbhowto