Explains cursor event dispatch and routing internals in the Gum UI runtime.
npx skills add https://github.com/vchelaru/Gum --skill gum-visual-events
Please help me install this Agent Skill. Skill: gum-visual-events Source: https://github.com/vchelaru/Gum/tree/main/.claude/skills/gum-visual-events Command: npx skills add https://github.com/vchelaru/Gum --skill gum-visual-events
Developers working on the Gum UI runtime struggle to understand how cursor events like Click, Push, and RollOver are raised and routed through the visual tree, leading to bugs when adding new events or diagnosing why clicks fail to fire.
Explain how Gum routes Click and RollOver events through the visual tree and how to add a new bubbling event without breaking existing behavior.
High-intent search queries and answers about installing and using this skill.
Gum cursor events are dispatched by DoUiActivityRecursively in InteractiveGue.cs, a single recursive walk over the visual tree. It descends to the deepest child under the cursor first, then unwinds, raising tunneling, bubbling, and single-target events along the way.
Add a parallel *Bubbling event alongside the single-target one, following the RollOverBubbling and ClickBubbling precedent. Give it its own HandledActions flag so its Handled state only suppresses ancestors for that event and never touches single-target Click or Push.
Cursor.Activity is edge-triggered, so calling Update twice in the same frame collapses the press/release edge and Push and Click silently never fire. Hover still works because it is position-only, so suspect a double Update call when GetEventFailureReason reports no problem.
Click is single-target and fires only where the cursor was both pushed and released on the same element. ClickBubbling uses a HandledActions.DidClickOccur flag set when a real click resolves, then fires on that element and the ancestors it unwinds through.
No, FlatRedBall does not share InteractiveGue because it is absent from GumCoreShared.projitems and FRB keeps its own copy. If a shared Forms control subscribes to a new visual event, FRB's InteractiveGue must gain the same member or FRB breaks with CS1061.
vchelaruWatch Gum source file changes and rebuild UI trees at runtime.
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