PRB: Cannot Change ActivePage of a PageFrame with a Hot Key

• Microsoft Visual FoxPro for Windows, version 3.0

SYMPTOMS

Under certain circumstances, the activepage of a pageframe object doesn't change when you press a hot key combination for a page.

CAUSE

The pageframe is not the only object on the form.

WORKAROUND

The pageframe container does not have a keypress method, so you need to modify the keypress method of the form to handle specific hot key combinations as in this example:

1. Create a new form.

2. Add a pageframe control, and change the name property to pgfexample.

3. Set the caption of page1 in pgfexample to Page\<1.

4. Set the caption of page2 in pgfexample to Page\<2.

5. Add the following code to the keypress method of the form:

   LPARAMETERS nKeyCode, nShiftAltCtrl DO CASE

         *Check to see if ALT+1 is pressed
         CASE nKeyCode=120 and nShiftAltCtrl=4
            this.pgfexample.activepage=1
   
         *Check to see if ALT+2 is pressed
         CASE nKeyCode=121 and nShiftAltCtrl=4
            this.pgfexample.activepage=2
   
      ENDCASE
   
   

6. Run the Form. Press ALT+1 to change the active page of the pageframe to page1. Press ALT+2 to change the active page of pgfexample to page2.

STATUS

This behavior is by design.

MORE INFORMATION

This particular issue occurs only if the form contains objects other than the pageframe. In the example, pressing ALT+1 or ALT+2 would select page1 or page2 without the code if there were no other objects on the form. The code in the keypress event is useful when the form contains objects outside of the pageframe.