/// <summary>
/// Fired when the scroll horizontal posizion change
/// </summary>
/// <param name="e"></param>
protected virtual void OnHScrollPositionChanged(ScrollPositionChangedEventArgs e)
{
if (HScrollPositionChanged != null)
{
HScrollPositionChanged(this, e);
}
}
/// <summary>
/// the grid has been scrolled vertically, different rows need to be displayed
/// </summary>
/// <param name="e"></param>
protected override void OnVScrollPositionChanged(SourceGrid.ScrollPositionChangedEventArgs e)
{
Int32 TopRowNumber;
Int32 BottomRowNumber;
Int32 Counter;
Int32 CheckPage;
Int32 LastCheckedPage = -1;
base.OnVScrollPositionChanged(e);
// TLogging.Log("OnVScrollPositionChanged. PageSize: " + FPageSize.ToString());
if (FPageSize != 0)
{
TopRowNumber = this.RangeAtArea(CellPositionType.Scrollable).Start.Row - 1; // this.ScrollablePanel.RangeAtDisplayRect(this.ScrollablePanel.ClientRectangle).Start.Row - 1;
BottomRowNumber = this.RangeAtArea(CellPositionType.Scrollable).End.Row - 1; // this.ScrollablePanel.RangeAtDisplayRect(this.ScrollablePanel.ClientRectangle).End.Row - 1;
// Need to increase BottomRowNumber by one to cater for possibly
// partly visible next Grid Row that the user could scroll to without
// causing an OnVScrollPositionChanged Event!
BottomRowNumber = BottomRowNumber + 1;
// TLogging.Log("OnVScrollPositionChanged: TopRowNumber: " + TopRowNumber.ToString() + "; BottomRowNumber: " + BottomRowNumber.ToString());
for (Counter = TopRowNumber; Counter <= BottomRowNumber; Counter++)
{
CheckPage = (int)((float)Counter / (float)FPageSize);
// TLogging.Log("OnVScrollPositionChanged: CheckPage: " + CheckPage.ToString());
if ((CheckPage != LastCheckedPage) && (CheckPage < FTotalPages))
{
// TLogging.Log("OnVScrollPositionChanged: Checking if Page #" + CheckPage.ToString() + " is already transfered...");
if (!FTransferredDataPages.Contains(CheckPage))
{
// TLogging.Log("OnVScrollPositionChanged: Page #" + CheckPage.ToString() + " is NOT transfered yet, requesting it from PetraServer...");
LoadSingleDataPage(CheckPage);
}
LastCheckedPage = CheckPage;
}
}
}
}
/// <summary>
/// OnVScrollPositionChanged
/// </summary>
/// <param name="e"></param>
protected override void OnVScrollPositionChanged(ScrollPositionChangedEventArgs e)
{
base.OnVScrollPositionChanged (e);
ArrangeLinkedControls();
}
/// <summary>
/// Fired when the scroll vertical posizion change
/// </summary>
/// <param name="e"></param>
protected virtual void OnVScrollPositionChanged(ScrollPositionChangedEventArgs e)
{
if (VScrollPositionChanged!=null)
VScrollPositionChanged(this,e);
}
