Add shimmer loading to news list

[sidr16]

Summary by CodeRabbit

• New Features
  • The news feed now displays a subtle shimmer animation during content loading, providing clearer visual feedback.
  • Enhanced animations deliver smoother transitions as news items appear, enriching the overall user experience.

[coderabbitai]

Walkthrough

The changes update the instantiation and behavior of the NewsListView widget. In the loading state, a new showShimmer parameter is added to display a shimmer effect, while the onItemBuildIndex parameter is removed in certain states. Inside NewsListView, list item construction is refactored into a private _buildItem method that conditionally returns a shimmer widget or a news card. Additionally, a new dependency (flutter_animate: ^4.5.2) is added to the project's dependencies.

Changes

File(s)	Change Summary
lib/src/presentation/pages/explore_page/explore_page.dart lib/src/presentation/widgets/sections/news_section.dart	Modified NewsListView instantiation: removed onItemBuildIndex in error state and added showShimmer: true in the loading state.
lib/src/presentation/widgets/list_views/news_list_view.dart	Added new boolean parameter showShimmer (in constructor and factory method) and refactored list item building into a private _buildItem method to support shimmer indicators.
pubspec.yaml	Added dependency: flutter_animate: ^4.5.2.

Sequence Diagram(s)

sequenceDiagram
    participant View as ExplorePage/NewsSection
    participant Bloc as BlocBuilder
    participant List as NewsListView
    participant Builder as _buildItem
    View->>Bloc: Request data (loadingWithData)
    Bloc->>List: Instantiate with showShimmer = true
    List->>Builder: Iterate over list indices
    alt Index exceeds news items
        Builder-->>List: Return PrimaryShimmer (NewsShimmerCard)
    else Valid news item
        Builder-->>List: Return NewsCard with animation
    end
    List-->>Bloc: Return constructed list view

Loading

Poem

I'm a rabbit, hopping with glee,
Shimmering codes now dance with esprit.
Parameters trimmed, a cleaner start,
News items and shimmers play their part.
A joyful leap in lines so neat,
Celebrating code with a rhythmic beat!

---

📜 Recent review details

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Review profile: CHILL
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📥 Commits

Reviewing files that changed from the base of the PR and between e87bd0b and aa5d149.

⛔ Files ignored due to path filters (1)

• pubspec.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• lib/src/presentation/pages/explore_page/explore_page.dart (1 hunks)
• lib/src/presentation/widgets/list_views/news_list_view.dart (5 hunks)
• lib/src/presentation/widgets/sections/news_section.dart (1 hunks)
• pubspec.yaml (1 hunks)

🔇 Additional comments (8)

pubspec.yaml (1)

40-40: Looks good - dependency added for animations.

The addition of flutter_animate is well-aligned with the implementation of shimmer loading effects in the news list views.

lib/src/presentation/widgets/sections/news_section.dart (1)

49-49: Appropriate use of shimmer during loading state.

Adding showShimmer: true for the loadingWithData state is a good UX improvement, providing visual feedback while additional content loads.

lib/src/presentation/pages/explore_page/explore_page.dart (1)

146-146: Consistent implementation of shimmer loading.

Adding showShimmer: true here matches the pattern in the news_section.dart file. I notice that onItemBuildIndex has been removed from this state handler - this is fine since the _buildItem method in NewsListView now manages this logic internally.

lib/src/presentation/widgets/list_views/news_list_view.dart (5)

2-2: Required imports correctly added.

The imports for flutter_animate, news_shimmer_card.dart, and primary_shimmer.dart are essential for implementing the shimmer loading feature.

Also applies to: 7-8

---

21-21: Well-structured parameter additions.

The showShimmer parameter has been added to both the constructor and factory method with appropriate default values, maintaining consistency across different ways of creating the widget.

Also applies to: 31-32, 36-37, 43-43

---

53-57: Smart approach to extending item count for shimmer.

Dynamically adjusting itemCount based on whether shimmer should be shown is a clean approach. Adding 10 additional items provides enough content for continuous scrolling during loading.

---

64-64: Good refactoring for reusability.

Replacing the duplicate item building logic with calls to _buildItem in both list views improves code organization and maintainability.

Also applies to: 80-80

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90-120: Well-implemented shimmer loading with animation.

The _buildItem method:

1. Correctly handles card type variation based on isFirstLarge
2. Shows shimmer placeholders for additional items when loading
3. Only triggers onItemBuildIndex for real news items
4. Adds a smooth fade animation to news cards

This is a clean implementation that improves both user experience and code structure.

---

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