Default the layer manager to be opened on map initialization and other toolbar tweaks

[sufyanAbbasi]

• The toolbar will now always show both the layer and toolbar buttons.
• On core map initialization, the layer manager will be opened by default.
• Right justified the buttons so that they didn't shift places when the layer manager is opened.
• The hover to open toolbar feature was kept in order to not disrupt existing workflows, however I noticed that this feature only works in Jupyter Lab and not Colab.

See: https://colab.research.google.com/drive/1HHQomXhy-vS68qiMu6AOhDmrsLq6OZwe#scrollTo=IouG0AzwPFID

[giswqs]

I am aware of this issue. It is related to ipyevents. I believe it does not support Colab. Need some investigation.

The hover to open toolbar feature was kept in order to not disrupt existing workflows, however I noticed that this feature only works in Jupyter Lab and not Colab.

[naschmitz]

Could you add unit tests if it's not too much trouble?

[sufyanAbbasi]

Could you add unit tests if it's not too much trouble?

No trouble at all! Done.

[sufyanAbbasi]

I am aware of this issue. It is related to ipyevents. I believe it does not support Colab. Need some investigation.

Gotcha, thanks for raising that! I'm leaning towards removing the hover effect for two reasons: 1) it's highly susceptible for jitter, and 2) it only opens the toolbar on hover since it would be hard to detect which button is being hovered (can use pixel calculations maybe?), so it might feel weird to users that only one of the two buttons are openable on hover, if that makes sense.

LMK what you prefer!

[giswqs]

@sufyanAbbasi Makes sense. Let's remove the hovering effect. We can potentially remove the ipyevent dependency completely after removing the hovering effect on the data search button in the upper-left corner. I can do that in another PR.

[giswqs]

I noticed one minor artifact: when clicking on the layer button, it shows the toolbar buttons briefly before showing the layer manager.

[sufyanAbbasi]

Let's remove the hovering effect.

On it!

it shows the toolbar buttons briefly before showing the layer manager.

Ah, good eye! Let me figure out what's going on there.

[sufyanAbbasi]

Removed the hover effect and also figured out why the toolbar flickered in like that: we need to have the on_layers_toggled callback method generate and set the layer_manager on the accessory_widget before we show the toolbar_footer. Otherwise, we end up showing the toolbar first for a momemnt since that's what's currently set in the toolbar_footer and then later the callback triggers and the content of the toolbar_footer are replaced by the layer_manager.

[giswqs]

Awesome! It works as expected now. No more flickering.

[naschmitz]

Thank you so much!