api_data_store

Description:

api data store

Provide a safe place to call API and handle errors. Support data observer and listener.
Usage #
/// Create a class to manage error
class MyErrorClass {
final dynamic error;

String getErrorMessage() {
return '$error';
}

MyErrorClass({required this.error});
}

/// Specify how to convert from any exception to MyErrorClass
MyErrorClass myErrorHandler(dynamic error) {
return MyErrorClass(error: error);
}

/// Pagination
Future fetchComplexPage() async {
final complexPage = DataPageBase<String, TestResponse, MyErrorClass>(
errorHandler: myErrorHandler,
handleResult: (res) {
return res.data;
},
handleTotal: (res) {
return res.total;
},
handleLastPage: (res) {
return res.lastPage;
}
);
complexPage.addStateChangeListener((state) {
print("loading ${state.isLoading}");
});
complexPage.addResponseListener((response) {
print("handle response ${response}");
});
/// No need to try catch
final state = await complexPage.fetch(() async {
return TestResponse(
total: 99,
lastPage: true,
data: ["1", "2", "3"],
);
});
print("""
State:
all loaded data ${state.data}
isLoading ${state.isLoading}
current page ${state.page}
pageSize ${state.pageSize}
isLastPage ${state.isLastPage}
initPage ${state.initPage}
total item ${state.total}
last error ${state.error}
""");
}

Future fetchSimplePage() async {
final page = DataPage(errorHandler: myErrorHandler);
final res = await page.fetch(() async {
return ["1", "2", "3"];
});
print("data ${res.data}");
}

/// Normal api call
Future fetchData() async {
final store = DataStore(errorHandler: myErrorHandler);
store.addStateChangeListener((state) {
print("loading ${state.isLoading}");
});
store.addErrorListener((error) {
print("handle error ${error}");
});
final state = await store.fetch(() async {
return "1";
});
print("""
State:
data ${state.data}
isLoading ${state.isLoading}
last error ${state.error}
""");
}

class TestResponse {
final int total;
final bool lastPage;
final List<String> data;

TestResponse({required this.total, required this.lastPage, required this.data});
}
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