/// <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 (IsGroupRow) { DataGridViewGroup group = Tag as DataGridViewGroup; TreeDataGridView grid = (TreeDataGridView)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 != null ? group.Header : "", 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 (!IsExpanded) { if (grid.CollapseIcon != 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); }
internal TreeDataGridViewRow(TreeDataGridView owner) : this() { Grid = owner; IsExpanded = true; }