/// <summary>
/// Handles the OnDemandDataSourceLoad event of the dataPager control.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="Syncfusion.Windows.Controls.Grid.GridDataOnDemandPageLoadingEventArgs"/> instance containing the event data.</param>
private async void dataPager_OnDemandDataSourceLoad(object sender, GridDataOnDemandPageLoadingEventArgs e)
{
DataPagerExt ex = e.Source as DataPagerExt;
ViewModel dataContext = this.AssociatedObject.DataContext as ViewModel;
bool IsCache = false;
//Assigning number of rows to be fetched from HBase
HBaseOperation.FetchSize = 5000;
if (!dataContext.ResultCollection.ContainsKey(ex.PageIndex) && HBaseOperation.HasRows)
{
dataContext.OrderDetails = await HBaseOperation.ScanTableAsync(dataContext.TableName, dataContext.Connection);
dataContext.ResultCollection.Add(ex.PageIndex == -1 ? 1 : ex.PageIndex, dataContext.OrderDetails);
IsCache = false;
}
else
{
dataContext.OrderDetails = dataContext.ResultCollection[ex.PageIndex];
IsCache = true;
}
bool IsPrevious = PreviousPageIndex > ex.PageIndex;
if (!IsPrevious && HBaseOperation.HasRows && !IsCache)
{
if (ex.PageIndex != -1)
{
ex.PageCount = ex.PageCount + 1;
}
}
PreviousPageIndex = ex.PageIndex == -1 ? 1 : ex.PageIndex;
}
/// <summary>
/// Wires the paging helper with GridGroupingControl.
/// </summary>
/// <param name="groupingGrid">GridGroupingControl</param>
/// <param name="table">DataTable</param>
public async void Wire(GridGroupingControl groupingGrid, String tableName, HBaseConnection con, Panel loaderPic)
{
commonLoaderPic = loaderPic;
_grid = groupingGrid;
this.tableName = tableName;
this.con = con;
ResultSet = await HBaseOperation.ScanTableAsync(tableName, con);
InitializePager();
}
//<summary>
//A method that was invoked on clicking arrow buttons in pager control.
//</summary>
//<param name="sender">The source of the event.</param>
//<param name="e">An <see cref="T:Syncfusion.Windows.Forms.ArrowButtonEventArgs">ArrowButtonEventArgs</see> that contains the event data.</param>
async void RecordNavigationBar_ArrowButtonClicked(object sender, ArrowButtonEventArgs e)
{
switch (e.Arrow)
{
case ArrowType.Previous:
_currentPage -= 1;
if (resultCollection.ContainsKey(_currentPage))
{
ResultSet = resultCollection[_currentPage];
}
FillPage(ResultSet);
break;
case ArrowType.Next:
{
_currentPage += 1;
if (!HBaseOperation.HasRows && !resultCollection.ContainsKey(_currentPage))
{
_currentPage -= 1;
}
else if (resultCollection.ContainsKey(_currentPage))
{
ResultSet = resultCollection[_currentPage];
}
else
{
if (HBaseOperation.HasRows)
{
_grid.Enabled = false;
commonLoaderPic.Visible = true;
HBaseOperation.FetchSize = 5000;
ResultSet = await HBaseOperation.ScanTableAsync(tableName, con);
commonLoaderPic.Visible = false;
_grid.Enabled = true;
}
}
FillPage(ResultSet);
DisplayPageInfo();
}
break;
}
}
