Refactor block event handling and add load_model gizmo support

[tracygardner]

Summary

This PR improves the event handling logic in block models and extends gizmo support to include the load_model type.

Key Changes

• Refactored block event handling in blocks/models.js:

  • Reorganized the conditional logic for processing block change events to be more explicit and maintainable
  • Moved handleMeshLifecycleChange check to execute first when the event targets this block or represents a block creation
  • Consolidated handleParentLinkedUpdate and handleFieldOrChildChange checks into a single conditional block
  • Removed the inverted logic condition that was checking this.id !== changeEvent.blockId && changeEvent.type !== Blockly.Events.BLOCK_CHANGE && !isThisBlockCreated

• Added load_model gizmo case in ui/gizmos.js:

  • Extended the gizmo toggle switch statement to handle the load_model case alongside existing model loading cases (load_multi_object, load_object, load_character)

Implementation Details

The refactoring in blocks/models.js improves code clarity by:

1. First handling mesh lifecycle changes for directly targeted blocks
2. Then handling parent-linked updates and field/child changes
3. Using positive conditions instead of negated logic, making the flow easier to follow and maintain

https://claude.ai/code/session_01CVKFvSifik74xZnSM6Fdwp

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 773389f6-56f4-46c0-91e5-b2ccf25f581a

📥 Commits

Reviewing files that changed from the base of the PR and between 7fcba7a and e70f4a8.

📒 Files selected for processing (2)

• blocks/models.js
• ui/gizmos.js

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📝 Walkthrough

Walkthrough

The load_model block's event-handling pipeline was refactored to prioritize mesh lifecycle changes and consolidate parent-linked and field-update handling logic. Additionally, gizmo scale-resize functionality was extended to support load_model blocks alongside similar block types.

Changes

Cohort / File(s)	Summary
Event Handler Refactoring blocks/models.js	Reorganized event-processing control flow in the load_model block handler to prioritize mesh lifecycle event handling earlier, then consolidated parent-linked and field/child update checks into a single early-return condition.
Gizmo Scale Support ui/gizmos.js	Added missing case "load_model": to the scale gizmo's onDragEndObservable switch statement to handle resize/DO-section updates for load_model blocks alongside load_multi_object, load_object, and load_character blocks.

Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~18 minutes

Possibly related PRs

• Handle BLOCK_CREATE events for nested blocks in snippets #413: Both PRs modify blocks/models.js event handling logic and introduce isThisBlockCreated checks for snippet-nested block behavior.

Poem

🐰 Hops through the event stream with glee,
Mesh lifecycles handled first, you see!
Then gizmos fall into place—
Load_model finds its space!
A pipeline reordered, logic in harmony~ ✨

🚥 Pre-merge checks | ✅ 2 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes both main changes: refactoring block event handling in blocks/models.js and adding load_model gizmo support in ui/gizmos.js.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/model-block-live-updates-awzHi

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