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03.24.2008 at 08:45AM PDT, ID: 23264319

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8.5

VFP Treeview issues with Keyboard

Zone: FoxPro Database

Tags: Microsoft, Visual Fox Pro, 9.0

I'm having several issues working with a Treeview (Active X). In the KeyDown event I set a public variable "KeyCombo" to the key combination being pressed (Ex: KeyCombo="CTRL+M"). In the KeyPress event, I use the value of KeyCombo to do various things... CTRL+M opens up the context menu, CTRL+A adds a new record, CTRL+E edits the current record, etc. The problem I am having is that the KeyPress event does not seem to fire off consistently. Sometimes when I press CTRL+M it works great, and sometimes it doesn't. I always make sure that the control has focus and I also put a wait window in the beginning of the KeyPress event to make sure it wasn't just my code. The wait window does not always appear when I press a combination of keys on the keyboard...

Is it possible that the Active X control is doing some work behind the scenes that is overriding the default keyboard handling? I've run out of ideas for getting it to work consistently. Any help would be greatly appreciated. :D

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Question Stats

Zone: Microsoft

Question Asked By: ruscomp

Solution Provided By: CaptainCyril

Participating Experts: 2

Solution Grade: A

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03.24.2008 at 09:57AM PDT, ID: 21194822

Rank: Sage

CaptainCyril:

If it's not working in the ActiveX when in focus, let it call the form's Keypress event with the same parameters.

03.24.2008 at 12:08PM PDT, ID: 21195933

ruscomp:

The treeview is in a class, so in the init of the class, i set the forms KeyPreview to .T., and then bind 'treeview_keypress' (which has all of my logic in it), to the forms KeyPress event. If I press a letter or arrow key, the form's KeyPress event never even fires off ! If I press tab, spacebar, F1, etc, the event fires off. Very strange. Now what?

03.24.2008 at 12:13PM PDT, ID: 21195980

Rank: Sage

CaptainCyril:

Did you check the events programmed in the class?

03.24.2008 at 12:20PM PDT, ID: 21196040

ruscomp:

Not sure exactly what you mean...

The class definitely has nothing that is overwriting the KeyPreview property's value or KeyPress event.
The treeview itself is in the 1st page of a pageframe (the pageframe is the class)

03.24.2008 at 12:25PM PDT, ID: 21196079

Rank: Sage

CaptainCyril:

Well have you added any code in the Keypress event of the class once pasted on the form? Like WAIT WINDOW or MESSAGEBOX?

03.24.2008 at 12:50PM PDT, ID: 21196280

ruscomp:

Yes, I have a WAIT WINDOW in the method that I am binidng to the form's KeyPress event (to show me when the event is actually firing off. And actually, the event does not fire off with the spacebar or F2,F3, etc. keys, only the TAB key.

03.24.2008 at 12:55PM PDT, ID: 21196330

Rank: Sage

CaptainCyril:

Very wierd.

I had that problem before and the way I solved it is by calling the form's Keypress Event from the ActiveX's Event.

Accepted Solution

03.24.2008 at 01:05PM PDT, ID: 21196424

ruscomp:

Well I can't exactly call it from within the Treeview's KeyPress event because it's only parameter is 'keyascii', which would be hard to split into the form's Keypress 'nKeyCode' & 'nShiftAltCtrl '. So like I said, I'm binding my method to the form's KeyPress event.

Maybe there is something I misunderstood?
(And btw, thank you CaptainCyril for all your help so far.)

03.24.2008 at 05:17PM PDT, ID: 21198632

Rank: Genius

CarlWarner:

Give this a try and see whether it helps or not:

Issue the =SYS(2333,0) command prior to the instantiation of the TreeView control.

PRB: TreeView Control HitTest Method Returns Empty String
http://support.microsoft.com/kb/168060/en-us

03.24.2008 at 05:22PM PDT, ID: 21198651

Rank: Genius

CarlWarner:

And take a look at setting the AutoYield property:

AutoYield Property
http://msdn2.microsoft.com/en-us/library/tzw0kthk(VS.80).aspx

The AutoYield property should be set to false (.F.) when a form contains an ActiveX control. Setting AutoYield to false (.F.) prevents events for an ActiveX control from executing between lines of user program code. For example, if AutoYield is set to true (.T.), clicking an ActiveX control while user program code is executing may cause an event for the ActiveX control to execute, ignoring the user program code for the event, producing undesirable or unpredictable results.

The following occurs when the AutoYield property is set to false (.F.):

ActiveX controls cannot process events until a wait state occurs, so clicking an ActiveX control has no effect while user program code is executing. This is the same behavior for Visual FoxPro controls such as the Grid.

ON KEY LABEL commands and mouse events are ignored while user program code is executing. The ON KEY LABEL commands and mouse events are placed in a queue and processed at the next wait state.

Pressing Esc does not interrupt program execution. This is identical to setting ESCAPE to OFF. In this case you cannot exit infinite loops without shutting down the instance of Visual FoxPro.

Queries cannot be interrupted.

Switching to other applications is supported, but you cannot switch back to Visual FoxPro while Visual FoxPro user program code is executing.

Assisted Solution

03.25.2008 at 06:45AM PDT, ID: 21201818

ruscomp:

Tried playing around with both the SYS(2333,0) AND AutoYield as you suggested Carl, and still nothing. However, I will leave them in the application though because I'm sure they may benefit me later. Thank you for the suggestions.

03.25.2008 at 07:06AM PDT, ID: 21202016

ruscomp:

Not exactly sure what did it, but the consistency seemed to come back after reverting the class back to it's original state and then reinserting my code.
The way I have it set up now, I am calling my keydown method from the activex's keydown and my keypress method from the activex's keypress (And passing in the parameters as neccessary).

03.25.2008 at 07:13AM PDT, ID: 21202065

ruscomp:

Just a note: I set AutoYield back to True And commented out SYS(2333,0), closed VFP and then ran again, just to check if they affected it and did not see any difference.

20080716-EE-VQP-33 / EE_QW_2_20070628