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When is excel conditional formatting refreshed ?

I have a worksheet, with the calculation is set to manual, where the on one sheet the formatting of one range of cells is dependant on the boolean value of another cell on the same sheet. I am using Excel 2010.

I then created a second range on a second sheet that also depends on the same control cell.

If I change the value of the control cell then the cells on sheet 1 do not change their formatting. If I switch to sheet 2 then the sheet 2 range has changed there formatting (based on the control cell in sheet1). If I switch back to sheet 1 then the range on that sheet has now had it's formatting updated also.

I can repeat these actions over and over again with the same result.

To put is simply : the refresh of the conditional formatting is only performed the the worksheet changes when the calculation mode is set to manual. If the calculation mode is set to auto then of course all formatting is updated immediately.

My question : Is this normal expected behaviour ?

I have attached a sample file to demonstrate this point. The control is the yellow cell on sheet 1.
Conditional-Formatting-refresh.xlsx
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AL_XResearch
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AL_XResearch
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2 Solutions
 
NBVCCommented:
Theoretically, conditional formatting needs to perform calculations too, so that it stands to reason that Manual Calc settings will not change instantly the settings of your sheet.  The fact that jumping from one sheet and back does the changes is probably more of a quirk or glitch than by design.  I tested yours in 2013 version and it reacts the same way as you mention.
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Rory ArchibaldCommented:
It doesn't seem unusual to me. When the range onscreen has to be redrawn, the CF is re-evaluated - you'll see the same behaviour if you simply scroll up and down on Sheet1 so that the range is off- then on-screen again. I think that's probably more efficient than re-evaluating all of  the CF values for every calculation.
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AL_XResearchAuthor Commented:
So basically the conditional formatting will refresh immediately but
The redraw is not performed unless the 'display' status of the cells change i.e. scrolling to show the cell or switching sheet
If the change in displayed formatting depends on a calculation then if the calc mode is set to manual then of course the formatting will not change.

This would then mean that the reevaluation of the CF is separate to the calc it just happens that in normal Excel use these two coincide and appear to be the same.

So how can you force a refresh from VBA without a calc ? Show and hide the sheet or it's cells ?
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Rory ArchibaldCommented:
Just using:
application.ScreenUpdating = True

Open in new window

should do it.
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AL_XResearchAuthor Commented:
rorya: Thanks so much ! I have used 'ScreenUpdating' for years to make sure my VBA actions did not show on the screen - I never knew you could use it to force a refresh.
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AL_XResearchAuthor Commented:
NB_VC:
The fact that jumping from one sheet and back does the changes is probably more of a quirk or glitch than by design
That is basically what I was trying to confrm.
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