AppFlowy/frontend/app_flowy/lib/workspace/presentation/home/home_screen.dart

import 'package:app_flowy/startup/plugin/plugin.dart';
import 'package:app_flowy/workspace/application/home/home_bloc.dart';
import 'package:app_flowy/workspace/presentation/widgets/edit_panel/panel_animation.dart';
import 'package:app_flowy/workspace/presentation/widgets/float_bubble/question_bubble.dart';
import 'package:app_flowy/startup/startup.dart';
import 'package:flowy_sdk/log.dart';
import 'package:flowy_infra_ui/style_widget/container.dart';
import 'package:flowy_sdk/protobuf/flowy-user/protobuf.dart' show UserProfilePB;
import 'package:flowy_sdk/protobuf/flowy-folder/protobuf.dart';
import 'package:flutter/gestures.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:styled_widget/styled_widget.dart';

import '../widgets/edit_panel/edit_panel.dart';

import 'home_layout.dart';
import 'home_stack.dart';
import 'menu/menu.dart';

class HomeScreen extends StatefulWidget {
  final UserProfilePB user;
  final CurrentWorkspaceSettingPB workspaceSetting;
  const HomeScreen(this.user, this.workspaceSetting, {Key? key})
      : super(key: key);

  @override
  State<HomeScreen> createState() => _HomeScreenState();
}

class _HomeScreenState extends State<HomeScreen> {
  ViewPB? initialView;

  @override
  void initState() {
    super.initState();
  }

  @override
  void didUpdateWidget(covariant HomeScreen oldWidget) {
    initialView = null;
    super.didUpdateWidget(oldWidget);
  }

  @override
  Widget build(BuildContext context) {
    return MultiBlocProvider(
      providers: [
        BlocProvider<HomeBloc>(
          create: (context) {
            return HomeBloc(widget.user, widget.workspaceSetting)
              ..add(const HomeEvent.initial());
          },
        ),
      ],
      child: Scaffold(
        body: BlocListener<HomeBloc, HomeState>(
          listenWhen: (p, c) => p.unauthorized != c.unauthorized,
          listener: (context, state) {
            if (state.unauthorized) {
              Log.error("Push to login screen when user token was invalid");
            }
          },
          child: BlocBuilder<HomeBloc, HomeState>(
            buildWhen: (previous, current) => previous != current,
            builder: (context, state) {
              final collapsedNotifier =
                  getIt<HomeStackManager>().collapsedNotifier;
              collapsedNotifier.addPublishListener((isCollapsed) {
                context
                    .read<HomeBloc>()
                    .add(HomeEvent.forceCollapse(isCollapsed));
              });
              return FlowyContainer(
                Theme.of(context).colorScheme.surface,
                // Colors.white,
                child: _buildBody(state),
              );
            },
          ),
        ),
      ),
    );
  }

  Widget _buildBody(HomeState state) {
    return LayoutBuilder(
      builder: (BuildContext context, BoxConstraints constraints) {
        final layout = HomeLayout(context, constraints, state.forceCollapse);
        const homeStack = HomeStack();
        final menu = _buildHomeMenu(
          layout: layout,
          context: context,
          state: state,
        );
        final homeMenuResizer = _buildHomeMenuResizer(context: context);
        final editPanel = _buildEditPanel(
          homeState: state,
          layout: layout,
          context: context,
        );
        const bubble = QuestionBubble();
        return _layoutWidgets(
          layout: layout,
          homeStack: homeStack,
          homeMenu: menu,
          editPanel: editPanel,
          bubble: bubble,
          homeMenuResizer: homeMenuResizer,
        );
      },
    );
  }

  Widget _buildHomeMenu(
      {required HomeLayout layout,
      required BuildContext context,
      required HomeState state}) {
    final workspaceSetting = state.workspaceSetting;
    if (initialView == null && workspaceSetting.hasLatestView()) {
      initialView = workspaceSetting.latestView;
      final plugin = makePlugin(
        pluginType: initialView!.pluginType,
        data: initialView,
      );
      getIt<HomeStackManager>().setPlugin(plugin);
    }

    HomeMenu homeMenu = HomeMenu(
      user: widget.user,
      workspaceSetting: workspaceSetting,
      collapsedNotifier: getIt<HomeStackManager>().collapsedNotifier,
    );

    final latestView =
        workspaceSetting.hasLatestView() ? workspaceSetting.latestView : null;
    if (getIt<MenuSharedState>().latestOpenView == null) {
      /// AppFlowy will open the view that the last time the user opened it. The _buildHomeMenu will get called when AppFlowy's screen resizes. So we only set the latestOpenView when it's null.
      getIt<MenuSharedState>().latestOpenView = latestView;
    }

    return FocusTraversalGroup(child: RepaintBoundary(child: homeMenu));
  }

  Widget _buildEditPanel(
      {required HomeState homeState,
      required BuildContext context,
      required HomeLayout layout}) {
    final homeBloc = context.read<HomeBloc>();
    return BlocBuilder<HomeBloc, HomeState>(
      buildWhen: (previous, current) =>
          previous.panelContext != current.panelContext,
      builder: (context, state) {
        return state.panelContext.fold(
          () => const SizedBox(),
          (panelContext) => FocusTraversalGroup(
            child: RepaintBoundary(
              child: EditPanel(
                panelContext: panelContext,
                onEndEdit: () =>
                    homeBloc.add(const HomeEvent.dismissEditPanel()),
              ),
            ),
          ),
        );
      },
    );
  }

  Widget _buildHomeMenuResizer({
    required BuildContext context,
  }) {
    return MouseRegion(
      cursor: SystemMouseCursors.resizeLeftRight,
      child: GestureDetector(
          dragStartBehavior: DragStartBehavior.down,
          onPanUpdate: ((details) {
            context
                .read<HomeBloc>()
                .add(HomeEvent.editPanelResized(details.delta.dx));
          }),
          behavior: HitTestBehavior.translucent,
          child: SizedBox(
            width: 10,
            height: MediaQuery.of(context).size.height,
          )),
    );
  }

  Widget _layoutWidgets({
    required HomeLayout layout,
    required Widget homeMenu,
    required Widget homeStack,
    required Widget editPanel,
    required Widget bubble,
    required Widget homeMenuResizer,
  }) {
    return Stack(
      children: [
        homeMenu
            .animatedPanelX(
              closeX: -layout.menuWidth,
              isClosed: !layout.showMenu,
            )
            .positioned(
                left: 0,
                top: 0,
                width: layout.menuWidth,
                bottom: 0,
                animate: true)
            .animate(layout.animDuration, Curves.easeOut),
        homeStack
            .constrained(minWidth: 500)
            .positioned(
                left: layout.homePageLOffset,
                right: layout.homePageROffset,
                bottom: 0,
                top: 0,
                animate: true)
            .animate(layout.animDuration, Curves.easeOut),
        homeMenuResizer.positioned(left: layout.homePageLOffset - 5),
        bubble
            .positioned(
              right: 20,
              bottom: 16,
              animate: true,
            )
            .animate(layout.animDuration, Curves.easeOut),
        editPanel
            .animatedPanelX(
              duration: layout.animDuration.inMilliseconds * 0.001,
              closeX: layout.editPanelWidth,
              isClosed: !layout.showEditPanel,
            )
            .positioned(
                right: 0, top: 0, bottom: 0, width: layout.editPanelWidth),
      ],
    );
  }
}