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Implementing Pull Down to Reload and Load More Rows on Demand
posted

Hi - I'm implementing both features mentioned above in one grid. The problem I am having is that when I implement the Pull Down to Reload feature it is making an addtional call out to the  IGGridViewDataSourceHelperLoadMoreDelegate.LoadMoreRows method. In other words when my view controller loads its making a call out to LoadMoreRows and I don't want it too and it's happening when I am implementing the Pull down to refresh feature.

If I comment out the:

//Set the overridden delegate to implement pull down to refresh.

gridView.Delegate = new gridViewDelegate (this);

Then everything works fine on the LoadMoreRows.


Not sure if my ordering of code is not right or if I need to combine these. Can you assist, below are some of my code snippets.

GRIDSETUP:

           //Set the overridden delegate to implement pull down to refresh.
            gridView.Delegate = new gridViewDelegate (this);

            //Next implement the load more helper
            dsh.LoadMoreDelegate = new LoadMoreHelper (gridView, this);

            //Next, set the data object
            dsh.Data = gridItemsSorted.ToArray ();

            // Set the DataSource
            gridView.DataSource = dsh;

            // Turn off empty rows
            gridView.EmptyRows = false;
 


CLASSES:

    public class LoadMoreHelper : IGGridViewDataSourceHelperLoadMoreDelegate
        {

            #region Members

            IGGridView gridView;
            RecentTestsTableViewController mRecentTestsTableViewController;

            #endregion

            #region Constructor

            public LoadMoreHelper (IGGridView GridView, RecentTestsTableViewController recentTestsTableViewController)
            {
                gridView = GridView;
                mRecentTestsTableViewController = recentTestsTableViewController;
            }

            #endregion

            #region Data Source Helper Methods

            public override IGGridViewLoadMoreCell ResolveLoadMoreCell (IGGridView gridView)
            {
                IGGridViewLoadMoreCell cell = (IGGridViewLoadMoreCell)gridView.DequeueReusableCell ("LoadMore");

                return cell;
            }

            public override bool NeedMoreRows (IGGridViewDataSourceHelper dataSource)
            {
                return dataSource.Data.Length < mRecentTestsTableViewController.mTotalRecords;
            }

            public override void LoadMoreRows (IGGridViewDataSourceHelper dataSource)
            {
                mRecentTestsTableViewController.mPage++;

                if (mRecentTestsTableViewController.lstFunctionalTestGroupSummary.Count > 0)
                    mRecentTestsTableViewController.lstFunctionalTestGroupSummary.InsertRange (mRecentTestsTableViewController.lstFunctionalTestGroupSummary.Count - 1, LoadFunctionalTestGroup());

                //Rebind the datasource
                dataSource.Data = mRecentTestsTableViewController.lstFunctionalTestGroupSummary.ToArray ();

                //Update the display
                gridView.UpdateData ();

            }


Parents
  • 40030
    Verified Answer
    Offline posted

    Hi!

    The 2 should work together without issue. In fact the twitter scenario sample we have in our samples browser, actually uses both features. 

    I've attached a sample, that implements both in C#. However, i'm not seeing the issue you described. Can you try it out, and let me know if there are any differences between the way i implemented it and the way you did?

    Thanks,

    -SteveZ

    PullDownAndLoadMore.zip
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