Center loading animation of buy button

Walkthrough

The changes in this pull request focus on the plus_dialog.dart file, specifically enhancing the _BuyButton widget. Modifications include the addition of a new alignment property to the Stack widget for centering its children, improvements to the build method to incorporate a loading state during purchases, and error handling in the buy method that displays a snackbar for exceptions. A boolean variable, isLoading, manages the visibility of the button and a loading indicator, utilizing Opacity widgets for smooth transitions.

Changes

File	Change Summary
lib/src/pages/home_page/plus_dialog.dart	Enhanced `_BuyButton` widget with new alignment property, loading state, and error handling.

Sequence Diagram(s)

sequenceDiagram
    participant User
    participant BuyButton
    participant PurchaseService
    participant Snackbar

    User->>BuyButton: Clicks purchase button
    BuyButton->>BuyButton: Set isLoading = true
    BuyButton->>PurchaseService: Initiates purchase
    alt Purchase successful
        PurchaseService-->>BuyButton: Purchase confirmed
        BuyButton->>BuyButton: Set isLoading = false
    else Purchase failed
        PurchaseService-->>BuyButton: Error occurred
        BuyButton->>Snackbar: Show error message
        BuyButton->>BuyButton: Set isLoading = false
    end

📜 Recent review details

**Configuration used: CodeRabbit UI** **Review profile: CHILL**

📥 Commits

Files that changed from the base of the PR and between 84d448e6b5b25e2ef704fa475ed2a9b58f876b21 and 51030e2eebabd14d8ee1b1ff4af9ddce1693c1e4.

📒 Files selected for processing (1)

* lib/src/pages/home_page/plus_dialog.dart (1 hunks)

🧰 Additional context used

🔇 Additional comments (4)

lib/src/pages/home_page/plus_dialog.dart (4)
`157-157`: **Good UI enhancement: Centering Stack children** The addition of `alignment: Alignment.center,` to the Stack widget improves the layout by ensuring that its children (button and loading indicator) are centered. This creates a more polished and visually appealing user interface. --- Line range hint `158-195`: **Well-implemented loading state with smooth transitions** The implementation of the loading state using Opacity widgets is well done. It provides a smooth transition between the button and the loading indicator, enhancing the user experience during the purchase process. The use of IgnorePointer widgets also ensures that the correct element (button or loading indicator) responds to user input based on the loading state. --- Line range hint `176-190`: **Proper error handling and state management** The error handling in the `onPressed` callback is well-implemented: 1. It catches exceptions and displays a user-friendly error message using a snackbar. 2. It correctly checks if the context is still mounted before showing the snackbar, preventing potential crashes. 3. The loading state is properly reset in the `finally` block, ensuring the UI returns to its initial state regardless of the outcome. These changes significantly improve the robustness and user-friendliness of the purchase process. --- Line range hint `157-195`: **Overall excellent improvements to the _BuyButton widget** The changes made to the `_BuyButton` widget significantly enhance both its functionality and user experience: 1. The centered alignment improves the visual appeal. 2. The loading state provides clear feedback during the purchase process. 3. Proper error handling with user-friendly messages increases robustness. These improvements make the purchase process more intuitive and reliable for users. Great job on these enhancements!

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nilsreichardt / AnkiGPT