fix!: Add DisplacementEvent to fix delta coordinate transformations for drag events #2871
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luanpotter
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Nov 26, 2023
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| final int pointerId; | ||
| final Duration timestamp; | ||
| final Vector2 delta; | ||
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| static final _nanPoint = Vector2.all(double.nan); |
spydon
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Nov 30, 2023
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Description
This adds
DisplacementEventto fix delta coordinate transformations for drag events, to be used instead ofPositionEvent.Drag Events now expose the start and end position, as well as the delta, correctly transformed by the camera and zoom.
This also ensures that drag events, once starts, do not get lost if the drag update leaves the component bounds.
Checklist
docsand added dartdoc comments with///.examplesordocs.Breaking Change?
Migration instructions
DragUpdateEventevents, thedevicePosition,canvasPosition,localPosition, anddeltaare deprecated as they are unclear.xStartPositionto get the position at the start of the drag event ("from")xEndPositionto get the position at the end of the drag event ("to")localDelta. it now already considers the camera zoom. no need to manually account for thatRelated Issues
This fixes #2843