richardfogaca opened a new pull request, #34276:
URL: https://github.com/apache/superset/pull/34276
### SUMMARY
This PR implements a unified custom tooltip feature for all deck.gl
charts. The feature allows users to create custom tooltips using Handlebars
templates, providing a consistent and flexible tooltip experience across
deck.gl visualizations.
The implementation supports:
- Custom HTML templates using Handlebars syntax
- Automatic field extraction from tooltip contents
- Fallback to default tooltips when no template is provided
- Aggregated data display for grid-based visualizations
### BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF
<img width="2138" height="924" alt="Screenshot 2025-07-12 at 17 37 03"
src="https://github.com/user-attachments/assets/cbf46769-f8bb-49d9-841f-724c725d5c33";
/>
### TESTING INSTRUCTIONS
1. Create any deck.gl chart (Scatter, Heatmap, Grid, Screengrid, Arc,
Path, Polygon, Hex, or Contour)
2. In the chart configuration, add columns/metrics to "Tooltip contents"
3. Notice the "Customize tooltips template" field appears below with
auto-generated template
4. Hover over data points to see the custom tooltip
5. Modify the template to use Handlebars helpers:
```handlebars
<div class="custom-tooltip" style={{ yourStyleHere }}>
{{ YOUR_COLUMN_OR_METRIC }}
</div>
6. Verify tooltips work correctly for aggregated data (e.g. Grid,
Screengrid)
7. Test that removing all content from the template falls back to default
tooltips
### ADDITIONAL INFORMATION
<!--- Check any relevant boxes with "x" -->
<!--- HINT: Include "Fixes #nnn" if you are fixing an existing issue -->
- [ ] Has associated issue:
- [ ] Required feature flags:
- [X] Changes UI
- [ ] Includes DB Migration (follow approval process in
[SIP-59](https://github.com/apache/superset/issues/13351))
- [ ] Migration is atomic, supports rollback & is backwards-compatible
- [ ] Confirm DB migration upgrade and downgrade tested
- [ ] Runtime estimates and downtime expectations provided
- [X] Introduces new feature or API
- [ ] Removes existing feature or API
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