/// <summary>
/// This can be used to auto-size the specified column in the specified
/// <see cref="System.Windows.Forms.DataGrid"/> control.
/// </summary>
/// <param name="dg">The data grid in which to size the column</param>
/// <param name="col">The column to resize</param>
internal static void AutoSizeColumn(DataGrid dg, int col)
{
MethodInfo mi = DataGridHelper.DataGridType(dg).GetMethod("ColAutoResize", BindingFlags.NonPublic |
BindingFlags.Instance);
mi.Invoke(dg, new object[] { col });
}
/// <summary>
/// Get the current table style in use for the specified <see cref="System.Windows.Forms.DataGrid"/>
/// control.
/// </summary>
/// <param name="dg">The data grid to use</param>
/// <returns>The current table style object in use by the data grid</returns>
internal static DataGridTableStyle CurrentTableStyle(DataGrid dg)
{
FieldInfo fi = DataGridHelper.DataGridType(dg).GetField("myGridTable", BindingFlags.NonPublic |
BindingFlags.Instance);
return((DataGridTableStyle)fi.GetValue(dg));
}
/// <summary>
/// This can be used to turn on double-buffering in the specified <see cref="System.Windows.Forms.DataGrid"/>
/// control to help reduce flickering during redraws.
/// </summary>
/// <param name="dg">The data grid in which to enable double-buffering</param>
internal static void DoubleBuffer(DataGrid dg)
{
MethodInfo mi = DataGridHelper.DataGridType(dg).GetMethod("SetStyle", BindingFlags.NonPublic |
BindingFlags.Instance);
mi.Invoke(dg, new object[] { ControlStyles.DoubleBuffer | ControlStyles.ResizeRedraw, true });
}
/// <summary>
/// This can be used to scroll the data grid up or down
/// </summary>
/// <param name="dg">The data grid to scroll</param>
/// <param name="rows">The number of rows to scroll (negative to scroll up, positive to scroll down)</param>
internal static void ScrollDown(DataGrid dg, int rows)
{
int firstVisibleRow, visibleRows, lastRow, newEndRow;
Type type = DataGridHelper.DataGridType(dg);
FieldInfo fr = type.GetField("firstVisibleRow", BindingFlags.NonPublic | BindingFlags.Instance);
FieldInfo vr = type.GetField("numTotallyVisibleRows", BindingFlags.NonPublic | BindingFlags.Instance);
firstVisibleRow = (int)fr.GetValue(dg);
visibleRows = (int)vr.GetValue(dg);
lastRow = DataGridHelper.RowCount(dg);
if (visibleRows <= rows)
{
newEndRow = firstVisibleRow + rows;
}
else
{
newEndRow = firstVisibleRow + rows + visibleRows;
}
if (newEndRow >= lastRow)
{
rows = lastRow - visibleRows - firstVisibleRow;
}
MethodInfo mi = type.GetMethod("ScrollDown", BindingFlags.NonPublic | BindingFlags.Instance);
mi.Invoke(dg, new object[] { rows });
}
/// <summary>
/// This can be used to get the number of rows in the specified <see cref="System.Windows.Forms.DataGrid"/>
/// control.
/// </summary>
/// <param name="dg">The data grid from which to get the row count</param>
/// <returns>The number of rows in the data grid</returns>
internal static int RowCount(DataGrid dg)
{
Type type = DataGridHelper.DataGridType(dg);
PropertyInfo pi = type.GetProperty("ListManager", BindingFlags.NonPublic | BindingFlags.Instance);
CurrencyManager cm = (CurrencyManager)pi.GetValue(dg, null);
return((cm != null) ? cm.Count : 0);
}
/// <summary>
/// This can be used to auto-size all columns in the specified <see cref="System.Windows.Forms.DataGrid"/>
/// control.
/// </summary>
/// <param name="dg">The data grid in which to size the columns</param>
internal static void AutoSizeColumns(DataGrid dg)
{
MethodInfo mi = DataGridHelper.DataGridType(dg).GetMethod("ColAutoResize", BindingFlags.NonPublic |
BindingFlags.Instance);
DataGridTableStyle dgs = DataGridHelper.CurrentTableStyle(dg);
for (int idx = 0; idx < dgs.GridColumnStyles.Count; idx++)
{
mi.Invoke(dg, new object[] { idx });
}
}
/// <summary>
/// This can be used to force the current edit column in the data grid to concede the focus. Changes
/// will be saved if possible.
/// </summary>
/// <param name="dg">The data grid to use</param>
internal static void ConcedeFocus(DataGrid dg)
{
Type type = DataGridHelper.DataGridType(dg);
FieldInfo fi = type.GetField("editColumn", BindingFlags.NonPublic | BindingFlags.Instance);
dg.EndEdit(null, 0, false);
DataGridColumnStyle dgc = (DataGridColumnStyle)fi.GetValue(dg);
if (dgc != null)
{
MethodInfo mi = dgc.GetType().GetMethod("ConcedeFocus", BindingFlags.NonPublic |
BindingFlags.Instance);
mi.Invoke(dgc, null);
}
}
