private async Task <bool> SetCurrentSortingWithEventCallback(IReadOnlyList <SortingItem <TItem> > newSorting)
{
CurrentUserState = CurrentUserState with {
Sorting = newSorting
};
previousUserState = CurrentUserState; // suppress another RefreshDataAsync call in OnParametersSetAsync
await InvokeCurrentUserStateChangedAsync(CurrentUserState);
return(true);
}
private async Task <bool> SetCurrentPageIndexWithEventCallback(int newPageIndex)
{
if (CurrentUserState.PageIndex != newPageIndex)
{
CurrentUserState = CurrentUserState with {
PageIndex = newPageIndex
};
previousUserState = CurrentUserState; // suppress another RefreshDataAsync call in OnParametersSetAsync
await InvokeCurrentUserStateChangedAsync(CurrentUserState);
return(true);
}
return(false);
}
/// <inheritdoc />
protected override async Task OnParametersSetAsync()
{
await base.OnParametersSetAsync();
Contract.Requires <InvalidOperationException>(DataProvider != null, $"Property {nameof(DataProvider)} on {GetType()} must have a value.");
Contract.Requires <InvalidOperationException>(CurrentUserState != null, $"Property {nameof(CurrentUserState)} on {GetType()} must have a value.");
Contract.Requires <InvalidOperationException>(!MultiSelectionEnabled || (ContentNavigationModeEffective != GridContentNavigationMode.InfiniteScroll), $"Cannot use multi selection with infinite scroll on {GetType()}.");
if (firstRenderCompleted && (previousUserState != CurrentUserState)) /* after first render previousUserState cannot be null */
{
// await: This adds one more render before OnParameterSetAsync is finished.
// We consider it safe because we already have some data.
// But for a moment (before data is refreshed (= before OnParametersSetAsync is finished), the component is rendered with a new user state and with old data).
previousUserState = CurrentUserState;
await RefreshDataAsync();
}
previousUserState = CurrentUserState;
}
/// <summary> /// Triggers the <see cref="CurrentUserStateChanged"/> event. Allows interception of the event in derived components. /// </summary> protected virtual Task InvokeCurrentUserStateChangedAsync(GridUserState <TItem> newGridUserState) => CurrentUserStateChanged.InvokeAsync(newGridUserState);
