/// <summary>
/// this function checks if the user hit the expand (+) or collapse (-) icon.
/// if it was hit it will return true
/// </summary>
/// <param name="e">mouse click event arguments</param>
/// <returns>returns true if the icon was hit, false otherwise</returns>
internal bool IsIconHit(DataGridViewCellMouseEventArgs e)
{
if (e.ColumnIndex < 0)
{
return(false);
}
OutlookGrid grid = (OutlookGrid)this.DataGridView;
Rectangle rowBounds = grid.GetRowDisplayRectangle(this.Index, false);
int x = e.X;
DataGridViewColumn c = grid.Columns[e.ColumnIndex];
if (this.isGroupRow &&
(c.DisplayIndex == 0) &&
(x > rowBounds.Left + 4) &&
(x < rowBounds.Left + 16) &&
(e.Y > rowBounds.Height - 18) &&
(e.Y < rowBounds.Height - 7))
{
return(true);
}
return(false);
//System.Diagnostics.Debug.WriteLine(e.ColumnIndex);
}
/// <summary>
/// the main difference with a Group row and a regular row is the way it is painted on the control.
/// the Paint method is therefore overridden and specifies how the Group row is painted.
/// Note: this method is not implemented optimally. It is merely used for demonstration purposes
/// </summary>
/// <param name="graphics"></param>
/// <param name="clipBounds"></param>
/// <param name="rowBounds"></param>
/// <param name="rowIndex"></param>
/// <param name="rowState"></param>
/// <param name="isFirstDisplayedRow"></param>
/// <param name="isLastVisibleRow"></param>
protected override void Paint(System.Drawing.Graphics graphics, System.Drawing.Rectangle clipBounds, System.Drawing.Rectangle rowBounds, int rowIndex, DataGridViewElementStates rowState, bool isFirstDisplayedRow, bool isLastVisibleRow)
{
if (this.isGroupRow)
{
OutlookGrid grid = (OutlookGrid)this.DataGridView;
int rowHeadersWidth = grid.RowHeadersVisible ? grid.RowHeadersWidth : 0;
// this can be optimized
Brush brush = new SolidBrush(grid.DefaultCellStyle.BackColor);
Brush brush2 = new SolidBrush(Color.FromKnownColor(KnownColor.GradientActiveCaption));
int gridwidth = grid.Columns.GetColumnsWidth(DataGridViewElementStates.Displayed);
Rectangle rowBounds2 = grid.GetRowDisplayRectangle(this.Index, true);
// draw the background
graphics.FillRectangle(brush, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset, rowBounds.Top, gridwidth, rowBounds.Height - 1);
// draw text, using the current grid font
graphics.DrawString(group.Text, grid.Font, Brushes.Black, rowHeadersWidth - grid.HorizontalScrollingOffset + 23, rowBounds.Bottom - 18);
//draw bottom line
graphics.FillRectangle(brush2, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset, rowBounds.Bottom - 2, gridwidth - 1, 2);
// draw right vertical bar
if (grid.CellBorderStyle == DataGridViewCellBorderStyle.SingleVertical || grid.CellBorderStyle == DataGridViewCellBorderStyle.Single)
{
graphics.FillRectangle(brush2, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + gridwidth - 1, rowBounds.Top, 1, rowBounds.Height);
}
if (group.Collapsed)
{
if (grid.ExpandIcon != null)
{
graphics.DrawImage(grid.ExpandIcon, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + 4, rowBounds.Bottom - 18, 11, 11);
}
}
else
{
if (grid.CollapseIcon != null)
{
graphics.DrawImage(grid.CollapseIcon, rowBounds.Left + rowHeadersWidth - grid.HorizontalScrollingOffset + 4, rowBounds.Bottom - 18, 11, 11);
}
}
brush.Dispose();
brush2.Dispose();
}
base.Paint(graphics, clipBounds, rowBounds, rowIndex, rowState, isFirstDisplayedRow, isLastVisibleRow);
}