Esempio n. 1
0
        protected override void Paint(Graphics graphics, Rectangle clipBounds, Rectangle cellBounds, int rowIndex, DataGridViewElementStates cellState, object value, object formattedValue, string errorText, DataGridViewCellStyle cellStyle, DataGridViewAdvancedBorderStyle advancedBorderStyle, DataGridViewPaintParts paintParts)
        {
            TreeGridNode node = this.OwningNode;

            if (node == null)
            {
                return;
            }

            Image image = node.Image;

            if (this._imageHeight == 0 && image != null)
            {
                this.UpdateStyle();
            }

            // paint the cell normally
            base.Paint(graphics, clipBounds, cellBounds, rowIndex, cellState, value, formattedValue, errorText, cellStyle, advancedBorderStyle, paintParts);

            // TODO: Indent width needs to take image size into account
            Rectangle glyphRect = new Rectangle(cellBounds.X + this.GlyphMargin, cellBounds.Y, INDENT_WIDTH, cellBounds.Height - 1);
            int       glyphHalf = glyphRect.Width / 2;

            //TODO: This painting code needs to be rehashed to be cleaner
            int level = this.Level;

            //TODO: Rehash this to take different Imagelayouts into account. This will speed up drawing
            //		for images of the same size (ImageLayout.None)
            if (image != null)
            {
                Point pp;
                if (_imageHeight > cellBounds.Height)
                {
                    pp = new Point(glyphRect.X + this.glyphWidth, cellBounds.Y + _imageHeightOffset);
                }
                else
                {
                    pp = new Point(glyphRect.X + this.glyphWidth, (cellBounds.Height / 2 - _imageHeight / 2) + cellBounds.Y);
                }

                // Graphics container to push/pop changes. This enables us to set clipping when painting
                // the cell's image -- keeps it from bleeding outsize of cells.
                System.Drawing.Drawing2D.GraphicsContainer gc = graphics.BeginContainer();
                {
                    graphics.SetClip(cellBounds);
                    graphics.DrawImageUnscaled(image, pp);
                }
                graphics.EndContainer(gc);
            }

            // Paint tree lines
            if (node._grid.ShowLines)
            {
                using (Pen linePen = new Pen(SystemBrushes.ControlDark, 1.0f))
                {
                    linePen.DashStyle = System.Drawing.Drawing2D.DashStyle.Dot;
                    bool isLastSibling  = node.IsLastSibling;
                    bool isFirstSibling = node.IsFirstSibling;
                    if (node.Level == 1)
                    {
                        // the Root nodes display their lines differently
                        if (isFirstSibling && isLastSibling)
                        {
                            // only node, both first and last. Just draw horizontal line
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                        }
                        else if (isLastSibling)
                        {
                            // last sibling doesn't draw the line extended below. Paint horizontal then vertical
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2);
                        }
                        else if (isFirstSibling)
                        {
                            // first sibling doesn't draw the line extended above. Paint horizontal then vertical
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.X + 4, cellBounds.Bottom);
                        }
                        else
                        {
                            // normal drawing draws extended from top to bottom. Paint horizontal then vertical
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom);
                        }
                    }
                    else
                    {
                        if (isLastSibling)
                        {
                            // last sibling doesn't draw the line extended below. Paint horizontal then vertical
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2);
                        }
                        else
                        {
                            // normal drawing draws extended from top to bottom. Paint horizontal then vertical
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top + cellBounds.Height / 2, glyphRect.Right, cellBounds.Top + cellBounds.Height / 2);
                            graphics.DrawLine(linePen, glyphRect.X + 4, cellBounds.Top, glyphRect.X + 4, cellBounds.Bottom);
                        }

                        // paint lines of previous levels to the root
                        TreeGridNode previousNode   = node.Parent;
                        int          horizontalStop = (glyphRect.X + 4) - INDENT_WIDTH;

                        while (!previousNode.IsRoot)
                        {
                            if (previousNode.HasChildren && !previousNode.IsLastSibling)
                            {
                                // paint vertical line
                                graphics.DrawLine(linePen, horizontalStop, cellBounds.Top, horizontalStop, cellBounds.Bottom);
                            }
                            previousNode   = previousNode.Parent;
                            horizontalStop = horizontalStop - INDENT_WIDTH;
                        }
                    }
                }
            }

            if (node.HasChildren || node._grid.VirtualNodes)
            {
                try
                {
                    // Paint node glyphs
                    if (node.IsExpanded)
                    {
                        node._grid.rOpen.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10));
                    }
                    else
                    {
                        node._grid.rClosed.DrawBackground(graphics, new Rectangle(glyphRect.X, glyphRect.Y + (glyphRect.Height / 2) - 4, 10, 10));
                    }
                }
                catch
                { }
            }
        }