public void ForceUpdate(WorksheetController dg)
{
dg.m_LastVisibleColumn=0;
dg.m_LastFullyVisibleColumn = 0;
this.Clear(); // clear all items
if(null==dg.DataTable)
return;
int actualColumnLeft = 0;
int actualColumnRight = dg.m_TableLayout.RowHeaderStyle.Width;
this.m_CachedWidth = dg.TableAreaWidth;
dg.m_LastFullyVisibleColumn = dg.FirstVisibleColumn;
for(int i=dg.FirstVisibleColumn;i<dg.DataTable.DataColumns.ColumnCount && actualColumnLeft<this.m_CachedWidth;i++)
{
actualColumnLeft = actualColumnRight;
Altaxo.Worksheet.ColumnStyle cs = dg.GetDataColumnStyle(i);
actualColumnRight = actualColumnLeft+cs.Width;
this.Add(new ColumnStyleCacheItem(cs,actualColumnLeft,actualColumnRight));
if(actualColumnLeft<this.m_CachedWidth)
dg.m_LastVisibleColumn = i;
if(actualColumnRight<=this.m_CachedWidth)
dg.m_LastFullyVisibleColumn = i;
}
}
/// <summary>
/// Retrieves the column number clicked onto
/// </summary>
/// <param name="dg">The parent data grid</param>
/// <param name="mouseCoord">The coordinates of the mouse click.</param>
/// <param name="cellRect">The function sets the x-properties (X and Width) of the cell rectangle.</param>
/// <returns>Either -1 when clicked on the row header area, column number when clicked in the column range, or int.MinValue when clicked outside of all.</returns>
public static int GetColumnNumber(WorksheetController dg, Point mouseCoord, ref Rectangle cellRect)
{
int firstVisibleColumn = dg.FirstVisibleColumn;
int actualColumnRight = dg.WorksheetLayout.RowHeaderStyle.Width;
int columnCount = dg.DataTable.DataColumns.ColumnCount;
if(mouseCoord.X<actualColumnRight)
{
cellRect.X=0; cellRect.Width=actualColumnRight;
return -1;
}
for(int i=firstVisibleColumn;i<columnCount;i++)
{
cellRect.X=actualColumnRight;
Altaxo.Worksheet.ColumnStyle cs = dg.GetDataColumnStyle(i);
actualColumnRight += cs.Width;
if(actualColumnRight>mouseCoord.X)
{
cellRect.Width = cs.Width;
return i;
}
} // end for
return int.MinValue;
}
