showCallOverlay method

Implementation

void showCallOverlay() {
  const overlayId = "call_overlay";

  if (FlutterOverlayManager.I.isOverlayShowing(overlayId)) return;

  FlutterOverlayManager.I.show(
    (context) {
      return Stack(
        children: [
          // Background mờ full màn
          Positioned.fill(
            child: GestureDetector(
              behavior: HitTestBehavior.translucent,
              onTap: () {
                hideCallOverlay();
              },
              child: Container(color: Colors.black54),
            ),
          ),

          // Màn CallingScreen bọc BlocProvider
          Center(
            child: BlocProvider.value(
              value: _bloc, // instance của SipControllerBloc
              child: const CallingScreen(),
            ),
          ),
        ],
      );
    },
    id: overlayId,
    zindex: 1,
    backgroundColor: Colors.transparent,
    dismissible: false,
  );
}