responsive_interactive_viewer.dart

GestureDetector(
                        onTap: () {
                          model.setInteraction(false);
                        },
                        behavior: HitTestBehavior.deferToChild,
                        child: InteractiveViewer(
                          panEnabled: false,
                          boundaryMargin: EdgeInsets.all(80),
                          onInteractionStart: (details) {
                            model.setInteraction(true);
                          },
                          onInteractionEnd: (details) {
                            model.setInteraction(false);
                          },
                          minScale: 0.5,
                          maxScale: 4,
                          child: Transform.scale(
                            scale: .85,
                            child: Stack(
                              children: [
                                Center(
                                  child: Container(
                                    height: systemService.screenHeight(context) - 16,
                                    width: systemService.screenWidth(context) - 32,
                                    child: IgnorePointer(ignoring: model.interacting, child: BodyCanvas()),
                                  ),
                                ),
                              ],
                            ),
                          ),
                        ),
                      ),