Tooltip: enhancement to follow mouse

[alex]

attached i a patch to enhance tooltips with a "followMouse" flag which allows them to be used for "hover inspection", a common use-case.

[alex]

bill: have you had a chance to look at this? I'd really like to get it merged in for 1.2 so we can use it with charts.

[bill]

I checked this over briefly. It looks nice but I see a few issues that need to be fixed:

• it's not accessible. If you tab into a node w/a tooltip, the tooltip doesn't appear. (The current code works correctly in this case.) Probably when triggered by onFocus rather than by onMouseEnter, the tooltip should be displaying with the arrow, positioned according to the target node (ie, as it works currently).

• sometimes the tooltip appears off screen, when the target element is at the bottom of the viewport.

• tooltip sometimes jumps. Example timeline:
  1. onMouseEnter occurs at (100,100)
  2. user moves mouse to (100,200), still over target node
  3. tooltip starts to fade in
  4. tooltip finishes fading in
  5. user moves mouse again

The tooltip fades in near (100,100), and jumps on step #5 to near (100,200).

I think if you roll in the code from charting/action2d/Tooltip..js into place.js, so that placeAroundElement() works on a rectangle too, it might solve the positioning problem, because you can position the tooltip according to an imaginary rectangle around the mouse cursor (36x36px)

[bill]

Too late for 1.2. This would be a nice enhancement to get in at some point if the above issues are fixed (or could go into dojox).

[Chris Mitchell]

please review/triage

[dylan]

Is this a feature worth considering for 2.0, or not so much? The existing patch from alex is unfortunately very stale and had issues before then, so removing the patch and cla flags.

[bill]

It's a toss up. We can close it.