Pages & Components Generated Code Docs (#252)

* Add page widget class info

* Add references and correct info for page gen code doc.

* Add diagrams for generated methods & classes for model class.

* fix refs

* fix refs

* minor code snippet adjustments

* Apply suggestions from code review

Co-authored-by: pinkeshmars <[email protected]>

* revise diagrams

* add hyperlink

---------

Co-authored-by: Pinkesh <[email protected]>
Co-authored-by: pinkeshmars <[email protected]>

Author: PoojaB26

docs/generated-code/component-gen-code.md

@@ -0,0 +1,39 @@
+---
+title: Components
+slug: /generated-code/component-model
+sidebar_position: 6
+---
+
+# Generated Code: Components
+
+Similar to a [**Page**](pages-generated-code.md), when creating a **[component](../resources/ui/components/intro-components.md)** in FlutterFlow, it automatically generates two files: a `Widget` class and a `Model` class. 
+
+:::info[Prerequisites]
+This guide uses examples from the generated code of the **[EcommerceFlow demo app](https://bit.ly/ff-docs-demo-v1)**. To view the generated code directly, check out the **[Github repository](https://github.com/FlutterFlow/sample-apps/tree/main/ecommerce_flow)**.
+:::
+
+## ComponentModel class
+
+`ComponentModel` classes are responsible for managing the state and behavior of individual components used within a page. These classes extend the `FlutterFlowModel` class, providing a consistent structure and shared functionality across all component models. This ensures that each component's state is isolated and reusable, making the app easier to maintain and scale.
+
+The lifecycle of a `ComponentModel` and its associated widget class follows the same structure as a page. For more details, refer to the documentation on **[Generated Pages](pages-generated-code.md)**.
+
+### onComponentLoad Action: Generated Code
+
+When you define actions for the `onComponentLoad` action trigger of a component, these actions are added inside an `addPostFrameCallback` method within the page's `initState` method. This ensures that the actions are executed only after the initial widget tree is built.
+
+```js
+ @override
+  void initState() {
+    super.initState();
+    _model = createModel(context, () => ProductListPageModel());
+
+    // On component load action.
+    SchedulerBinding.instance.addPostFrameCallback((_) async {
+        await _model.updateTotalCost(context);
+        safeSetState(() {});
+    });
+    
+  }
+```
+

docs/generated-code/flutterflow-model.md

@@ -0,0 +1,109 @@
+---
+title: FlutterFlow Model
+slug: /generated-code/flutterflow-model
+sidebar_position: 4
+---
+
+# FlutterFlow Model
+
+The `FlutterFlowModel` class is an abstract class used in FlutterFlow to provide a unified and extensible structure for managing state and behavior of widgets (both pages and components). It encapsulates **initialization, state management,** and **disposal** logic, making it easier to handle the lifecycle of widgets and their models. 
+
+FlutterFlow automatically generates the `flutter_flow_model.dart` file, which contains the `FlutterFlowModel` class and utility methods like `wrapWithModel()` and `createModel()`.
+
+The diagram below illustrates how these utility classes and methods are utilized in a widget or model class:
+
+
+![page-generated.png](imgs/page-generated.png)
+
+When a component is added to your page (and every component you create [generates both a widget and a model class)](component-gen-code.md), the flow below explains how the utility classes are used when there is a child component:
+
+![page-component-generated.png](imgs/page-component-generated.png)
+
+<p></p>
+
+Here’s a breakdown of the lifecycle of `FlutterFlowModel` class:
+
+## Initialization
+Ensures the model is initialized **only once** and is tied to the `BuildContext` and the widget it is associated with.
+
+```js
+abstract class FlutterFlowModel<W extends Widget> {
+  // Initialization methods
+  bool _isInitialized = false;
+  void initState(BuildContext context);
+  void _init(BuildContext context) {
+    if (!_isInitialized) {
+      initState(context);
+      _isInitialized = true;
+    }
+    if (context.widget is W) _widget = context.widget as W;
+    _context = context;
+  }
+```
+
+
+## Widget & Context references 
+
+Provides references to the associated widget and its `BuildContext`.
+
+```js
+  // The widget associated with this model. This is useful for accessing the
+  // parameters of the widget, for example.
+  W? _widget;
+  W? get widget => _widget;
+
+  // The context associated with this model.
+  BuildContext? _context;
+  BuildContext? get context => _context;
+```
+
+`_widget` and `_context` (private fields) store the widget and context references. `widget` and `context` (getters) are the public accessors for `_widget` and `_context`.
+
+## Disposal
+
+Manages the cleanup of resources when the model or widget is disposed.
+
+```js
+ bool disposeOnWidgetDisposal = true;
+  void dispose();
+  void maybeDispose() {
+    if (disposeOnWidgetDisposal) {
+      dispose();
+    }
+    // Remove reference to widget for garbage collection purposes.
+    _widget = null;
+  }
+```
+The `disposeOnWidgetDisposal` determines whether the model should be disposed when the widget is removed. This defaults to `true` for **pages** and `false` for **components** (as parent models typically manage their child components).
+
+The `maybeDispose()` checks `disposeOnWidgetDisposal` before disposing. It removes the widget reference to aid garbage collection.
+
+## Updates and Change Notification
+
+Allows the model to notify the associated widget or parent component/page when updates occur.
+
+```js
+ // Whether to update the containing page / component on updates.
+  bool updateOnChange = false;
+  // Function to call when the model receives an update.
+  VoidCallback _updateCallback = () {};
+  void onUpdate() => updateOnChange ? _updateCallback() : () {};
+  
+  FlutterFlowModel setOnUpdate({
+    bool updateOnChange = false,
+    required VoidCallback onUpdate,
+  }) =>
+      this
+        .._updateCallback = onUpdate
+        ..updateOnChange = updateOnChange;
+  
+  // Update the containing page when this model received an update.
+  void updatePage(VoidCallback callback) {
+    callback();
+    _updateCallback();
+  }
+```
+
+## wrapWithModel() 
+
+The `wrapWithModel()` method in FlutterFlow links a model to a widget and its child widgets, allowing them to access and manage state. It wraps the widget with a Provider, making the model available throughout the widget tree.