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MyLayoutViewScrollHelper.cs
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MyLayoutViewScrollHelper.cs
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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using DevExpress.XtraGrid.Views.Layout;
using DevExpress.XtraGrid.Views.Layout.ViewInfo;
using DevExpress.XtraGrid.Views.Layout.Events;
namespace WindowsApplication1
{
public class MyLayoutViewScrollHelper
{
private LayoutView _SelectedLayoutView;
public LayoutView SelectedLayoutView
{
get { return _SelectedLayoutView; }
set { _SelectedLayoutView = value; }
}
public MyLayoutViewScrollHelper(LayoutView view)
{
SelectedLayoutView = view;
SelectedLayoutView.VisibleRecordIndexChanged += SelectedLayoutView_VisibleRecordIndexChanged;
}
private int GetVisibleCardsCount()
{
int visibleCardsCount = (SelectedLayoutView.GetViewInfo() as LayoutViewInfo).VisibleCards.Count;
return visibleCardsCount;
}
int GetPageByVisibleIndex(int visibleIndex)
{
return visibleIndex / GetVisibleCardsCount();
}
bool IsScrollForward(LayoutViewVisibleRecordIndexChangedEventArgs e)
{
return GetPageByVisibleIndex(e.VisibleRecordIndex) == GetPageByVisibleIndex(e.PrevVisibleRecordIndex);
}
int GetFirstCardIndex(int pageIndex, bool isForward)
{
int delta = isForward ? 1 : 0;
return GetVisibleCardsCount() * (pageIndex + delta);
}
bool locked;
private void ScrollPage(LayoutViewVisibleRecordIndexChangedEventArgs e)
{
SelectedLayoutView.VisibleRecordIndex = e.PrevVisibleRecordIndex;
SelectedLayoutView.VisibleRecordIndex = GetFirstCardIndex(GetPageByVisibleIndex(e.VisibleRecordIndex), IsScrollForward(e));
}
void SelectedLayoutView_VisibleRecordIndexChanged(object sender, LayoutViewVisibleRecordIndexChangedEventArgs e)
{
if (locked) return;
locked = true;
ScrollPage(e);
locked = false;
}
}
}