### Registering Service Worker and Loading App Script - JavaScript

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/examples/web/index.html

This code snippet attempts to register a service worker ('flutter_service_worker.js') to enable offline capabilities and caching. It waits for the service worker to activate before loading the main application script ('main.dart.js'). It includes logic to handle initial installation, updates, and a timeout-based fallback to load the script directly if the service worker fails.

```JavaScript
var serviceWorkerVersion = null;
var scriptLoaded = false;

function loadMainDartJs() {
  if (scriptLoaded) {
    return;
  }
  scriptLoaded = true;
  var scriptTag = document.createElement('script');
  scriptTag.src = 'main.dart.js';
  scriptTag.type = 'application/javascript';
  document.body.append(scriptTag);
}

if ('serviceWorker' in navigator) {
  // Service workers are supported. Use them.
  window.addEventListener('load', function () {
    // Wait for registration to finish before dropping the <script> tag.
    // Otherwise, the browser will load the script multiple times,
    // potentially different versions.
    var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
    navigator.serviceWorker.register(serviceWorkerUrl)
      .then((reg) => {
        function waitForActivation(serviceWorker) {
          serviceWorker.addEventListener('statechange', () => {
            if (serviceWorker.state == 'activated') {
              console.log('Installed new service worker.');
              loadMainDartJs();
            }
          });
        }

        if (!reg.active && (reg.installing || reg.waiting)) {
          // No active web worker and we have installed or are installing
          // one for the first time. Simply wait for it to activate.
          waitForActivation(reg.installing || reg.waiting);
        } else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
          // When the app updates the serviceWorkerVersion changes, so we
          // need to ask the service worker to update.
          console.log('New service worker available.');
          reg.update();
          waitForActivation(reg.installing);
        } else {
          // Existing service worker is still good.
          console.log('Loading app from service worker.');
          loadMainDartJs();
        }
      });

    // If service worker doesn't succeed in a reasonable amount of time,
    // fallback to plaint <script> tag.
    setTimeout(() => {
      if (!scriptLoaded) {
        console.warn(
          'Failed to load app from service worker. Falling back to plain <script> tag.',
        );
        loadMainDartJs();
      }
    }, 4000);
  });
} else {
  // Service workers not supported. Just drop the <script> tag.
  loadMainDartJs();
}
```

--------------------------------

### Creating Staired GridView in Flutter

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

This example shows how to implement a stair-like grid layout using `GridView.custom` and `SliverStairedGridDelegate`. It sets spacing, reverses the cross-axis direction, and defines a pattern of `StairedGridTile`s with specified aspect ratios and cross-axis ratios.

```dart
GridView.custom(
  gridDelegate: SliverStairedGridDelegate(
    crossAxisSpacing: 48,
    mainAxisSpacing: 24,
    startCrossAxisDirectionReversed: true,
    pattern: [
      StairedGridTile(0.5, 1),
      StairedGridTile(0.5, 3 / 4),
      StairedGridTile(1.0, 10 / 4),
    ],
  ),
  childrenDelegate: SliverChildBuilderDelegate(
    (context, index) => Tile(index: index),
  ),
);
```

--------------------------------

### Adding Dependency in pubspec.yaml

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

Adds the flutter_staggered_grid_view package as a dependency to your Flutter project's pubspec.yaml file. Replace <latest_version> with the desired version number.

```yaml
dependencies:
  ...
  flutter_staggered_grid_view: <latest_version>
```

--------------------------------

### Importing Staggered Grid View in Dart

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

Imports the necessary library for using the flutter_staggered_grid_view package in your Dart code.

```dart
import 'package:flutter_staggered_grid_view/flutter_staggered_grid_view.dart';
```

--------------------------------

### Creating Masonry Grid in Dart

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

Shows how to create a scrollable MasonryGridView using MasonryGridView.count. It sets the number of columns (crossAxisCount), spacing, and uses an itemBuilder to dynamically create tiles with varying heights based on the index. Requires the flutter_staggered_grid_view package and a Tile widget.

```dart
MasonryGridView.count(
  crossAxisCount: 4,
  mainAxisSpacing: 4,
  crossAxisSpacing: 4,
  itemBuilder: (context, index) {
    return Tile(
      index: index,
      extent: (index % 5 + 1) * 100,
    );
  },
);
```

--------------------------------

### Creating Quilted Grid with GridView in Dart

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

Illustrates how to create a Quilted grid layout using the standard Flutter GridView.custom widget with a SliverQuiltedGridDelegate. It defines the column count, spacing, a repeat pattern, and a list of QuiltedGridTile objects specifying the pattern for tile sizes. Requires the flutter_staggered_grid_view package and a Tile widget.

```dart
GridView.custom(
  gridDelegate: SliverQuiltedGridDelegate(
    crossAxisCount: 4,
    mainAxisSpacing: 4,
    crossAxisSpacing: 4,
    repeatPattern: QuiltedGridRepeatPattern.inverted,
    pattern: [
      QuiltedGridTile(2, 2),
      QuiltedGridTile(1, 1),
      QuiltedGridTile(1, 1),
      QuiltedGridTile(1, 2),
    ],
  ),
  childrenDelegate: SliverChildBuilderDelegate(
    (context, index) => Tile(index: index)
  ),
);
```

--------------------------------

### Open iOS Project in Xcode

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/examples/ios/Runner/Assets.xcassets/LaunchImage.imageset/README.md

This command opens the iOS runner project of your Flutter application in Xcode. This is necessary if you plan to manage assets, such as the launch screen image, using Xcode's built-in asset catalog manager.

```Shell
open ios/Runner.xcworkspace
```

--------------------------------

### Creating Woven GridView in Flutter

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

This snippet demonstrates how to create a woven grid layout using `GridView.custom` with `SliverWovenGridDelegate.count`. It configures the number of columns, spacing, and defines a tile pattern using `WovenGridTile` to control tile sizes and alignment.

```dart
GridView.custom(
  gridDelegate: SliverWovenGridDelegate.count(
    crossAxisCount: 2,
    mainAxisSpacing: 8,
    crossAxisSpacing: 8,
    pattern: [
      WovenGridTile(1),
      WovenGridTile(
        5 / 7,
        crossAxisRatio: 0.9,
        alignment: AlignmentDirectional.centerEnd,
      ),
    ],
  ),
  childrenDelegate: SliverChildBuilderDelegate(
    (context, index) => Tile(index: index),
  ),
);
```

--------------------------------

### Creating Staggered Grid in Dart

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

Demonstrates how to create a non-scrollable StaggeredGrid using StaggeredGrid.count. It defines the number of columns (crossAxisCount), spacing, and a list of StaggeredGridTile.count children with varying column and row spans. Requires the flutter_staggered_grid_view package and a Tile widget.

```dart
StaggeredGrid.count(
  crossAxisCount: 4,
  mainAxisSpacing: 4,
  crossAxisSpacing: 4,
  children: const [
    StaggeredGridTile.count(
      crossAxisCellCount: 2,
      mainAxisCellCount: 2,
      child: Tile(index: 0),
    ),
    StaggeredGridTile.count(
      crossAxisCellCount: 2,
      mainAxisCellCount: 1,
      child: Tile(index: 1),
    ),
    StaggeredGridTile.count(
      crossAxisCellCount: 1,
      mainAxisCellCount: 1,
      child: Tile(index: 2),
    ),
    StaggeredGridTile.count(
      crossAxisCellCount: 1,
      mainAxisCellCount: 1,
      child: Tile(index: 3),
    ),
    StaggeredGridTile.count(
      crossAxisCellCount: 4,
      mainAxisCellCount: 2,
      child: Tile(index: 4),
    ),
  ],
);
```

--------------------------------

### Creating Aligned GridView in Flutter

Source: https://github.com/letsar/flutter_staggered_grid_view/blob/master/README.md

This snippet demonstrates the use of `AlignedGridView.count` to create an aligned grid layout similar to CSS Grid. It specifies the number of columns, spacing, and uses an `itemBuilder` to create tiles with varying extents, ensuring tiles in the same row have equal height.

```dart
AlignedGridView.count(
  crossAxisCount: 4,
  mainAxisSpacing: 4,
  crossAxisSpacing: 4,
  itemBuilder: (context, index) {
    return Tile(
      index: index,
      extent: (index % 7 + 1) * 30,
    );
  },
);
```

=== COMPLETE CONTENT === This response contains all available snippets from this library. No additional content exists. Do not make further requests.