advanced_value_notifier 0.0.3

A value notifier which has super powers, like allows to see past value along with the new

This package allows you to notify listener about the previous value and current value.

Features

• Get both previous and current value
• Listen to the value changes
• Build widget optimally by consider previous and current value

Usage

HistoryValueListenableListener

    HistoryValueListenableListener<int>(
      historyValueNotifier: counter,
      historyValueWidgetListener: (int prevValue, int value) {
        ScaffoldMessenger.of(context).showMaterialBanner(MaterialBanner(
            content: Text("Simple Prev $prevValue Curr $value"),
            actions: [
              GestureDetector(
                child: const Text("Cancel"),
                onTap: () {
                  ScaffoldMessenger.of(context).clearMaterialBanners();
                },
              )
            ]));
      },
      child: const Text(
        'Simple Listener',
      ),
    )

HistoryValueListenableBuilder

    HistoryValueListenableBuilder<int>(
      historyValueNotifier: counter,
      historyValueBuilder: (BuildContext context, int prevValue,
          int value, Widget? child) {
        return Text(
          "Prev $prevValue Curr $value",
        );
      },
    )

TransformerHistoryValueListenableBuilder

    TransformerHistoryValueListenableBuilder<int, int>(
      transformerHistoryValueNotifier: transformerHistoryValueNotifier,
      transformerHistoryValueBuilder: (BuildContext context,
          int? prevValue,
          int? prevTransformedValue,
          int value,
          int? transformedValue,
          Widget? child) {
        return Text(
          "Prev $prevValue PrevTransformed $prevTransformedValue Curr $value Transformed $transformedValue",
        );
      },
    )

TransformerHistoryValueListenableListener

    TransformerHistoryValueListenableListener<int, int>(
      transformerHistoryValueNotifier: transformerHistoryValueNotifier,
      transformerHistoryValueWidgetListener: (
        int? prevValue,
        int? prevTransformedValue,
        int value,
        int? transformedValue,
      ) {
        ScaffoldMessenger.of(context).clearSnackBars();
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(
            content: Text(
          "Prev $prevValue PrevTransformed $prevTransformedValue "
          "Curr $value Transformed $transformedValue",
        )));
      },
      child: const Text(
        "Transformer Listener",
      ),
    )

Additional information

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