beginHandleDrag method

void beginHandleDrag(
  1. double y,
  2. double sheetPosition
)

Called when a pointer-down event lands in the sheet's handle zone.

Implementation

void beginHandleDrag(double y, double sheetPosition) {
  phase = GesturePhase.handleDrag;
  dragStartY = y;
  lastMoveY = y;
  dragStartSheetPosition = sheetPosition;
}