feat(modal): expose isDismissing on ionDragEnd

[aeharding]

Issue number: resolves #31001

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What is the current behavior?

The ionDragEnd event on card modals emits currentY, deltaY, velocityY and progress. None of these indicate whether the modal is about to dismiss, so consumers cannot react to the outcome of the gesture when the user lifts their finger.

What is the new behavior?

• ionDragEnd now includes isDismissing on card modals. It is true when the gesture passed the dismiss threshold and the modal will animate away, and false when the modal will settle back open.
• Updated tests.

Sheet modals are unchanged and continue to report snapBreakpoint.

Does this introduce a breaking change?

• Yes
• No

Other information

Testing with Voyager and works great! aeharding/voyager#2227

Previews:

• Card modal
• Sheet modal

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[thetaPC]

snapBreakpoint is specific to sheet modals, and card modals have no breakpoint concept, so exposing a "breakpoint" here is a bit misleading. Let's call it isDismissing and return a plain boolean instead of 0/1.

Suggested change

	snapBreakpoint: shouldComplete ? 0 : 1,
	isDismissing: shouldComplete,

This also follows the convention we use for other booleans on public event details, such as isScrolling on ion-content's ScrollDetail and isAnimating on the menu interface.

One more change to go with it: please add the field to ModalDragEventDetail in modal-interface.ts so it's part of the public type:

/**
   * Whether the card modal will dismiss when the drag gesture ends.
   * `true` if the gesture passed the dismiss threshold, `false` if the
   * modal will remain open.
   */
  isDismissing?: boolean;

[thetaPC]

Adding this variable changes the ionDragEnd detail length, so the existing assertion in modal-card.e2e.ts will fail. Please update the expected length there.

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Project	Deployment	Actions	Updated (UTC)
ionic-framework	Ready	Preview	Jul 31, 2026 11:10pm

[ShaneK]

Awesome work! I did catch an issue that I believe is blocking and some others that aren't necessarily but might be nice to fix now

[ShaneK]

Looks good to me! Great work!