Canvas: Left key is -7, right key is -6 and middle key is -5 in all phones?

Hi,
Before MIDP 2.0, Canvas can't show full screen. And Nokia UI provides FullCanvas for us to do so. And this class has 2 static final variable: KEY_SOFTKEY1, KEY_SOFT_KEY2 and KEY_SOFTKEY3.
But MIDP 2.0's Canvas has no any variables to specify the soft keys.
But according to Series 60 Developer Platform 2.0: Specification v1.0 (http://www.forum.nokia.com/Forum/Common_Templates/FileDownloadThankYou?fileID=4296&fileURL=aHR0cDovL25kczEuZm9ydW0ubm9raWEuY29tL25uZHMvRm9ydW1Eb3dubG9hZFNlcnZsZXQ/aWQ9NDI5NiZuYW1lPVNlcmllcyU1RjYwJTVGRGV2ZWxvcGVyJTVGUGxhdGZvcm0lNUYyJTVGMCU1RlNwZWNpZmljYXRpb24lNUZ2MSU1RjAlNUZlbiUyRXBkZg==) from www.forum.nokia.com.
Page 77:
Left soft key, -6, "Left soft key" or left soft-key symbol
Right soft key, -7, "Right soft key" or right soft-key symbol
Middle soft key, -5, "Select", "Middle soft key" or similar symbol
I did try in Nokia emulators / real phones. -6, -7 and -5 can work for representing the 3 soft keys.
And it's same in WTK 2.1 / 2.2 emulators.
Can I conclude like that:
-7, -6 and -5 are fixed to stand for 3 soft keys in all MIDP compatible devices ?
Please advice me.
Thanks.
http://www.geocities.com/akokchai/

No you can't.
Soft keys are not part of the standard and there's no guarantee all MIDP devices will even have softkeys (let alone three of them). AFAIK all the Nokia handsets use the same codes for the softkeys, but for other manufacturers the codes can/will be different (for instance, on many Motorola handsets I've tried the codes for left/right softkeys were -20 and -21), and on some devices they don't even generate key events.
Bottom line: if you want to use the softkeys on your full screen canvas you'll need to do separate builds for each handset or class of handsets or manufacturer, etc.
shmoove

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