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content: sheet modal docs should explain how to keep interactive content from dragging the sheet

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
88/100
Issue type
Documentation
Clarity
Clearly specified
Activity status
Active
Tech stack
markdown
Domain
documentation

Research direction

Start with the Sheet Modal section in docs/api/modal.mdx and the corresponding section in versioned_docs/version-v8/api/modal.mdx. Add the proposed Interactive content subsection, including the touchstart and mousedown listeners and the notes about pointerdown and CSS approaches. Done means both documentation versions explain how to keep interactive content from dragging the sheet.

Written by the indexing model from the issue text.

Description

content
URL

https://ionicframework.com/docs/api/modal#sheet-modal

Issue Description

Any drag on a sheet modal's content also moves the sheet between breakpoints. This breaks content that needs its own drag, such as image resizers, drawing or signature pads, and other vertical-swipe widgets. It came up in ionic-team/ionic-framework#30064 and earlier in ionic-team/ionic-framework#24715.

The current API already supports this, but the docs don't mention it. The sheet gesture starts from touchstart and mousedown, so stopping those two events from bubbling out of an element keeps the sheet still while that element is dragged:

const stopSheetDrag = (ev) => ev.stopPropagation();
el.addEventListener('touchstart', stopSheetDrag);
el.addEventListener('mousedown', stopSheetDrag);

Stopping pointerdown does not work, and neither do CSS approaches such as touch-action: none. Both are the first things people try. Applying the same listeners to ion-content makes the sheet draggable only from the handle and header.

Suggested addition: a short "Interactive content" subsection under Sheet Modal with the snippet above and those two notes, in docs/api/modal.mdx and versioned_docs/version-v8/api/modal.mdx.

Dominant language
MDX
Stars
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Forks
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Avg merge
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Merged PRs (30d)
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