Don't hide tooltip when pointer is over it.

[grokys]

What does the pull request do?

As described in #8638, don't hide the tooltip for a control when the pointer moves over it.

What is the current behavior?

If a tooltip should be shown near the bounds of the screen, it won't appear. You can test this on the tooltip page in the control catalog.

What is the updated/expected behavior with this PR?

The tooltip stays open.

Checklist

• Added unit tests (if possible)?

Fixed issues

Fixes #8638

[MrJul]

Shouldn't the tooltip close when the mouse isn't over it anymore?
With this PR, the user has to move the mouse back from the tooltip to the original control, then out of it again for the tooltip to disappear.

[ltetak]

I think this should solve this #13709

[grokys]

Shouldn't the tooltip close when the mouse isn't over it anymore?
With this PR, the user has to move the mouse back from the tooltip to the original control, then out of it again for the tooltip to disappear.

Good point. I guess if we go with this approach we need to check for the pointer exiting the tooltip and then close if it's over another control.

@MrJul not sure what you think of this approach vs #13709 ? I suspect that capturing the mouse to show a tooltip is going to break things.

[MrJul]

Good point. I guess if we go with this approach we need to check for the pointer exiting the tooltip and then close if it's over another control.

Yes, I think that would solve the issue.

@MrJul not sure what you think of this approach vs #13709 ? I suspect that capturing the mouse to show a tooltip is going to break things.

I've commented on #13709: I agree with you, the capture approach is breaking things.

[grokys]

@MrJul ok, pushed a fix for the pointer exiting the tooltip.

[MrJul]

@MrJul ok, pushed a fix for the pointer exiting the tooltip.

I've tested the PR and it reacts exactly as I would expect :)

[MrJul]

LGTM!

[ltetak]

Sorry for commenting on an old thread. This solution works great on Windows but does not work on macOS and probably does not work on Linux as well (#11179).
IsPointerOver is not set quickly enough and the tooltip does not have IsPointerOver set yet when the ControlPointerExited is invoked.
The problem is fundamentally in the order of two events: RawPointerEventType.LeaveWindow (for leaving the main window) and other events that activate the ToolTip popup window. The window is not activated immediately on mac. One needs to move the cursor above the window to get it activated. This delay causes the tooltip to be closed immediately.
I believe the solution would be to find some native event that would notify Avalonia layer ASAP when the window has been created and the mouse is over it without waiting for the mouse movement.
@grokys this works for me, can you check, please? #15251
Other platforms could use the same pattern