Ability to position Tooltip centered to target

[nielsbosma]

Is your feature request related to a problem? Please describe.

I have a tooltip on a Slider Thumb displaying the current value:

I want to position the tooltip in the centre over the thumb.

Describe the solution you'd like

Add Center + Middle in PopupGravity.

Add support for AnchorAndGravity to Tooltips.

Describe alternatives you've considered

Additional context

[ahopper]

you can trick it to almost do it with

<Slider ToolTip.Tip="{Binding $self.Value}" ToolTip.HorizontalOffset="{Binding $self.Value}" />

a converter to shrink the value would make it work better.
A bodge I know but might give a clue as how to do properly.

[maxkatz6]

@ahopper if you set tooltip directly on the thumb, it might give better results
Like this https://github.com/AvaloniaUI/Avalonia/blob/master/samples/ControlCatalog/Pages/SliderPage.xaml#L30

@nielsbosma can you try it as well?

[ahopper]

That works well, a much better solution. I've switched out all my sliders for thumbwheels so am not actually using dynamic tooltips anymore but good to know.

[nielsbosma]

I am setting the tooltip on the thumb. The issue is the positioning of the tooltip over the thumb.

[nielsbosma]

I figured out a workaround. I add a fixed width outer panel to the tooltip and then use horizontaloffset.