handleTouchEvent method

GemError handleTouchEvent(
  1. int pointerIndex,
  2. int touchType,
  3. int x,
  4. int y,
)

Handle a touch event delivered to the map view.

Sends a single pointer touch event (down/move/up/cancel) to the map view for processing. The call is non-blocking; the event is dispatched for handling and this method returns immediately. Use this to forward raw pointer events received by the embedding application so the map can respond to user interaction.

The API user usually does not need to call this method directly, as the GemMapController automatically forwards touch events.

Parameters

  • pointerIndex: The pointer index of the touch event (multi-touch index).
  • touchType: The type of the touch event:
    • 0 = down
    • 1 = move
    • 2 = up
    • 3 = cancel
  • x: The x coordinate of the touch event in physical pixels, relative to the map view's top-left corner.
  • y: The y coordinate of the touch event in physical pixels, relative to the map view's top-left corner.

Returns

Implementation

GemError handleTouchEvent(
  final int pointerIndex,
  final int touchType,
  final int x,
  final int y,
) {
  unawaited(
    GemKitPlatform.instance
        .getChannel(mapId: mapId)
        .invokeMethod<void>('handleTouchEvent', <String, int>{
          'id': _pointerId,
          'x': x,
          'y': y,
          'touchType': touchType,
          'pointerIndex': pointerIndex,
        }),
  );
  return GemError.success;
}