The Palm OS’s display system had to undergo three mayor overhauls in the last few years – dynamic UI(long time ago), HiRes+ and 5way navigation. The path to dynamic UI was very, very buggy afaik, HiRes+ worked well and 5way nav is, umm, more like dynamic UI to me.
Anyways, I had a nice modal form that reacted to WinDisplayChangedEvents. That form was popped up via FrmPopupForm(the only such form in the entire app…all others worked fine =) ). The resizing didn’t quite work out on Chris Schrinner’s TX:
There seems to be some kind of quirk with PalmOne engineers having placed a cache into their 5way nav system that stores whats behind the blue ring. Now, when the form gets resized, this cache somehow screws up and distorts/obfuscates the proximity of the poor control that happened to be selected.
Fixing the problem is rather simple – remove the focus, do the movement and then restore focus. Here is how I did it(no special headers needed btw):
err = FtrGet(sysFtrCreator, sysFtrNumFiveWayNavVersion, &buffer);
if (err == errNone)
// One-handed navigation is supported
//Party with the controls here
if(err==errNone && buffer!=noFocus)
P.s. I know that this code doesn’t detect the Treo 600 as 5way capable. But since the Treo 600 has no HiRes+ screen, I don’t really care as it will never see this code anyways….