Pagelet control (#2469)

* Pagelet control initial commit

* appbar property incomplete

* Pagelet and AppBar

* navigation_bar and bottom_appbar properties

* bottom_sheet property

* drawer and endDrawer started

* Added drawers

* drawer property - drawer is not opening

* drawer, end_drawer properties work

* floating_action_button, floating_action_button_location

* clean up

* fixed imports

---------

Co-authored-by: Feodor Fitsner <feodor@appveyor.com>

package/lib/src/controls/create_control.dart

@@ -67,6 +67,7 @@ import 'navigation_bar.dart';
 import 'navigation_rail.dart';
 import 'outlined_button.dart';
 import 'page.dart';
+import 'pagelet.dart';
 import 'piechart.dart';
 import 'popup_menu_button.dart';
 import 'progress_bar.dart';
@@ -259,6 +260,14 @@ Widget createWidget(Key? key, ControlViewModel controlView, Control? parent,
           children: controlView.children,
           parentDisabled: parentDisabled,
           dispatch: controlView.dispatch);
+    case "pagelet":
+      return PageletControl(
+          key: key,
+          parent: parent,
+          control: controlView.control,
+          children: controlView.children,
+          parentDisabled: parentDisabled,
+          dispatch: controlView.dispatch);
     case "progressring":
       return ProgressRingControl(
           key: key, parent: parent, control: controlView.control);

package/lib/src/controls/pagelet.dart

@@ -0,0 +1,246 @@
+import 'package:collection/collection.dart';
+import 'package:flutter/cupertino.dart';
+import 'package:flutter/material.dart';
+import 'package:flutter_redux/flutter_redux.dart';
+
+import '../actions.dart';
+import '../flet_app_services.dart';
+import '../models/app_state.dart';
+import '../models/control.dart';
+import '../models/controls_view_model.dart';
+import '../protocol/update_control_props_payload.dart';
+import '../utils/colors.dart';
+import 'app_bar.dart';
+import 'create_control.dart';
+import 'cupertino_app_bar.dart';
+import 'error.dart';
+import 'floating_action_button.dart';
+import 'navigation_drawer.dart';
+
+class PageletControl extends StatefulWidget {
+  final Control? parent;
+  final Control control;
+  final List<Control> children;
+  final bool parentDisabled;
+  final dynamic dispatch;
+
+  const PageletControl(
+      {super.key,
+      this.parent,
+      required this.control,
+      required this.children,
+      required this.parentDisabled,
+      required this.dispatch});
+
+  @override
+  State<PageletControl> createState() => _PageletControlState();
+}
+
+class _PageletControlState extends State<PageletControl> {
+  final scaffoldKey = GlobalKey<ScaffoldState>();
+
+  @override
+  Widget build(BuildContext context) {
+    debugPrint("Pagelet build: ${widget.control.id}");
+
+    var appBarCtrls =
+        widget.children.where((c) => c.name == "appbar" && c.isVisible);
+    var contentCtrls =
+        widget.children.where((c) => c.name == "content" && c.isVisible);
+    var navigationBarCtrls =
+        widget.children.where((c) => c.name == "navigationbar" && c.isVisible);
+    var bottomAppBarCtrls =
+        widget.children.where((c) => c.name == "bottomappbar" && c.isVisible);
+    var bottomSheetCtrls =
+        widget.children.where((c) => c.name == "bottomsheet" && c.isVisible);
+    var drawerCtrls =
+        widget.children.where((c) => c.name == "drawer" && c.isVisible);
+    var endDrawerCtrls =
+        widget.children.where((c) => c.name == "enddrawer" && c.isVisible);
+    var fabCtrls = widget.children
+        .where((c) => c.name == "floatingactionbutton" && c.isVisible);
+
+    if (contentCtrls.isEmpty) {
+      return const ErrorControl("Pagelet must have content specified.");
+    }
+
+    bool disabled = widget.control.isDisabled || widget.parentDisabled;
+
+    var bgcolor = HexColor.fromString(
+        Theme.of(context), widget.control.attrString("bgcolor", "")!);
+
+    List<String> childIds = [
+      appBarCtrls.firstOrNull?.id,
+      drawerCtrls.firstOrNull?.id,
+      endDrawerCtrls.firstOrNull?.id
+    ].whereNotNull().toList();
+
+    return StoreConnector<AppState, ControlsViewModel>(
+        distinct: true,
+        converter: (store) => ControlsViewModel.fromStore(store, childIds),
+        ignoreChange: (state) {
+          //debugPrint("ignoreChange: $id");
+          for (var id in childIds) {
+            if (state.controls[id] == null) {
+              return true;
+            }
+          }
+          return false;
+        },
+        builder: (context, childrenViews) {
+          var navBar = navigationBarCtrls.isNotEmpty
+              ? createControl(
+                  widget.control, navigationBarCtrls.first.id, disabled)
+              : null;
+          var bottomAppBar = bottomAppBarCtrls.isNotEmpty
+              ? createControl(
+                  widget.control, bottomAppBarCtrls.first.id, disabled)
+              : null;
+          var bnb = navBar ?? bottomAppBar;
+
+          var appBarView = childrenViews.controlViews.firstWhereOrNull(
+              (v) => v.control.id == (appBarCtrls.firstOrNull?.id ?? ""));
+
+          var drawerView = childrenViews.controlViews.firstWhereOrNull(
+              (v) => v.control.id == (drawerCtrls.firstOrNull?.id ?? ""));
+          var endDrawerView = childrenViews.controlViews.firstWhereOrNull(
+              (v) => v.control.id == (endDrawerCtrls.firstOrNull?.id ?? ""));
+
+          final bool? drawerOpened = widget.control.state["drawerOpened"];
+          final bool? endDrawerOpened = widget.control.state["endDrawerOpened"];
+
+          final fabLocation = parseFloatingActionButtonLocation(
+              widget.control,
+              "floatingActionButtonLocation",
+              FloatingActionButtonLocation.endFloat);
+
+          void dismissDrawer(String id) {
+            List<Map<String, String>> props = [
+              {"i": id, "open": "false"}
+            ];
+            widget.dispatch(UpdateControlPropsAction(
+                UpdateControlPropsPayload(props: props)));
+            FletAppServices.of(context).server.updateControlProps(props: props);
+            FletAppServices.of(context).server.sendPageEvent(
+                eventTarget: id, eventName: "dismiss", eventData: "");
+          }
+
+          WidgetsBinding.instance.addPostFrameCallback((_) {
+            if (drawerView != null) {
+              if (scaffoldKey.currentState?.isDrawerOpen == false &&
+                  drawerOpened == true) {
+                widget.control.state["drawerOpened"] = false;
+                dismissDrawer(drawerView.control.id);
+              }
+              if (drawerView.control.attrBool("open", false)! &&
+                  drawerOpened != true) {
+                if (scaffoldKey.currentState?.isEndDrawerOpen == true) {
+                  scaffoldKey.currentState?.closeEndDrawer();
+                }
+                Future.delayed(const Duration(milliseconds: 1)).then((value) {
+                  scaffoldKey.currentState?.openDrawer();
+                  widget.control.state["drawerOpened"] = true;
+                });
+              } else if (!drawerView.control.attrBool("open", false)! &&
+                  drawerOpened == true) {
+                scaffoldKey.currentState?.closeDrawer();
+                widget.control.state["drawerOpened"] = false;
+              }
+            }
+            if (endDrawerView != null) {
+              if (scaffoldKey.currentState?.isEndDrawerOpen == false &&
+                  endDrawerOpened == true) {
+                widget.control.state["endDrawerOpened"] = false;
+                dismissDrawer(endDrawerView.control.id);
+              }
+              if (endDrawerView.control.attrBool("open", false)! &&
+                  endDrawerOpened != true) {
+                if (scaffoldKey.currentState?.isDrawerOpen == true) {
+                  scaffoldKey.currentState?.closeDrawer();
+                }
+                Future.delayed(const Duration(milliseconds: 1)).then((value) {
+                  scaffoldKey.currentState?.openEndDrawer();
+                  widget.control.state["endDrawerOpened"] = true;
+                });
+              } else if (!endDrawerView.control.attrBool("open", false)! &&
+                  endDrawerOpened == true) {
+                scaffoldKey.currentState?.closeEndDrawer();
+                widget.control.state["endDrawerOpened"] = false;
+              }
+            }
+          });
+
+          var bar = appBarView != null
+              ? appBarView.control.type == "appbar"
+                  ? AppBarControl(
+                      parent: widget.control,
+                      control: appBarView.control,
+                      children: appBarView.children,
+                      parentDisabled: widget.control.isDisabled,
+                      height: appBarView.control
+                          .attrDouble("toolbarHeight", kToolbarHeight)!)
+                  : appBarView.control.type == "cupertinoappbar"
+                      ? CupertinoAppBarControl(
+                          parent: widget.control,
+                          control: appBarView.control,
+                          children: appBarView.children,
+                          parentDisabled: widget.control.isDisabled,
+                          bgcolor: HexColor.fromString(Theme.of(context),
+                              appBarView.control.attrString("bgcolor", "")!),
+                        ) as ObstructingPreferredSizeWidget
+                      : null
+              : null;
+          return constrainedControl(
+              context,
+              Scaffold(
+                  key: scaffoldKey,
+                  appBar: bar,
+                  backgroundColor: bgcolor,
+                  //backgroundColor: Colors.red,
+                  drawer: drawerView != null
+                      ? NavigationDrawerControl(
+                          control: drawerView.control,
+                          children: drawerView.children,
+                          parentDisabled: widget.control.isDisabled,
+                          dispatch: widget.dispatch,
+                        )
+                      : null,
+                  onDrawerChanged: (opened) {
+                    if (drawerView != null && !opened) {
+                      widget.control.state["drawerOpened"] = false;
+                      dismissDrawer(drawerView.control.id);
+                    }
+                  },
+                  endDrawer: endDrawerView != null
+                      ? NavigationDrawerControl(
+                          control: endDrawerView.control,
+                          children: endDrawerView.children,
+                          parentDisabled: widget.control.isDisabled,
+                          dispatch: widget.dispatch,
+                        )
+                      : null,
+                  onEndDrawerChanged: (opened) {
+                    if (endDrawerView != null && !opened) {
+                      widget.control.state["endDrawerOpened"] = false;
+                      dismissDrawer(endDrawerView.control.id);
+                    }
+                  },
+                  body: contentCtrls.isNotEmpty
+                      ? createControl(
+                          widget.control, contentCtrls.first.id, disabled)
+                      : null,
+                  bottomNavigationBar: bnb,
+                  bottomSheet: bottomSheetCtrls.isNotEmpty
+                      ? createControl(
+                          widget.control, bottomSheetCtrls.first.id, disabled)
+                      : null,
+                  floatingActionButton: fabCtrls.isNotEmpty
+                      ? createControl(
+                          widget.control, fabCtrls.first.id, disabled)
+                      : null,
+                  floatingActionButtonLocation: fabLocation),
+              widget.parent,
+              widget.control);
+        });
+  }
+}

sdk/python/packages/flet-core/src/flet_core/__init__.py

@@ -81,7 +81,11 @@
     DataTable,
 )
 from flet_core.date_picker import DatePicker, DatePickerEntryMode, DatePickerMode
-from flet_core.dismissible import Dismissible, DismissibleDismissEvent, DismissibleUpdateEvent
+from flet_core.dismissible import (
+    Dismissible,
+    DismissibleDismissEvent,
+    DismissibleUpdateEvent,
+)
 from flet_core.divider import Divider
 from flet_core.drag_target import DragTarget, DragTargetAcceptEvent
 from flet_core.draggable import Draggable
@@ -154,6 +158,7 @@
     RouteChangeEvent,
     ViewPopEvent,
 )
+from flet_core.pagelet import Pagelet
 from flet_core.painting import (
     Paint,
     PaintingStyle,