//---------------------------------------------------------------------
//
// Copyright (c) Microsoft Corporation. All rights reserved.
//
//THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
//KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
//IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
//PARTICULAR PURPOSE.
//---------------------------------------------------------------------
using System;
using System.Windows.Forms;
using System.Drawing;
using System.Windows.Forms.VisualStyles;
using System.Diagnostics;
namespace HierarchicalGrid
{
/// <summary>
/// Summary description for TreeGridCell.
/// </summary>
public class TreeGridCell:DataGridViewTextBoxCell
{
private const int INDENT_WIDTH = 20;
private const int INDENT_MARGIN = 5;
private int glyphWidth;
private int calculatedLeftPadding;
internal bool IsSited;
private Padding _previousPadding;
private int _imageWidth = 0, _imageHeight = 0, _imageHeightOffset = 0;
private Rectangle _lastKnownGlyphRect;
public TreeGridCell()
{
glyphWidth = 15;
calculatedLeftPadding = 0;
this.IsSited = false;
}
public override object Clone()
{
TreeGridCell c = (TreeGridCell)base.Clone();
c.glyphWidth = this.glyphWidth;
c.calculatedLeftPadding = this.calculatedLeftPadding;
return c;
}
internal protected virtual void UnSited()
{
// The row this cell is in is being removed from the grid.
this.IsSited = false;
this.Style.Padding = this._previousPadding;
}
internal protected virtual void Sited()
{
// when we are added to the DGV we can realize our style
this.IsSited = true;
// remember what the previous padding size is so it can be restored when unsiting
this._previousPadding = this.Style.Padding;
this.UpdateStyle();
}
internal protected virtual void UpdateStyle(){
// styles shouldn't be modified when we are not sited.
if (this.IsSited == false) return;
int level = this.Level;
Padding p = this._previousPadding;
Size preferredSize;
using (Graphics g = this.OwningNode._grid.CreateGraphics() ) {
preferredSize =this.GetPreferredSize(g, this.InheritedStyle, this.RowIndex, new Size(0, 0));
}
Image image = this.OwningNode.Image;
if (image != null)
{
// calculate image size
_imageWidth = image.Width+2;
_imageHeight = image.Height+2;
}
else
{
_imageWidth = glyphWidth;
_imageHeight = 0;
}
// TODO: Make this cleaner
if (preferredSize.Height < _imageHeight)
{
this.Style.Padding = new Padding(p.Left + (level * INDENT_WIDTH) + _imageWidth + INDENT_MARGIN,
p.Top + (_imageHeight / 2), p.Right, p.Bottom + (_imageHeight / 2));
_imageHeightOffset = 2;// (_imageHeight - preferredSize.Height) / 2;
}
else
{
this.Style.Padding = new Padding(p.Left + (level * INDENT_WIDTH) + _imageWidth + INDENT_MARGIN,
p.Top , p.Right, p.Bottom );
}
calculatedLeftPadding = ((level - 1) * glyphWidth) + _imageWidth + INDENT_MARGIN;
}
public int Level
{
get
{
HierarchicalGridNode row = this.OwningNode;
if (row != null)
{
return row.Level;
}
else
return -1;
}
}
protected virtual int GlyphMargin
{
get
{
return ((this.Level - 1) * INDENT_WIDTH) + INDENT_MARGIN;
}
}
protected virtual int GlyphOffset
{
get
{
return ((this.Level - 1) * INDENT_WIDTH);
}
}
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)
{
HierarchicalGridNode 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);
}
#region 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)
{
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
{
// 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);
}
}
}
}
#endregion
if (node.HasChildren || node._grid.VirtualNodes)
{
// 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));
}
}
protected override void OnMouseUp(DataGridViewCellMouseEventArgs e)
{
base.OnMouseUp(e);
HierarchicalGridNode node = this.OwningNode;
if (node != null)
node._grid._inExpandCollapseMouseCapture = false;
}
protected override void OnMouseDown(DataGridViewCellMouseEventArgs e)
{
if (e.Location.X > this.InheritedStyle.Padding.Left)
{
base.OnMouseDown(e);
}
else
{
// Expand the node
//TODO: Calculate more precise location
HierarchicalGridNode node = this.OwningNode;
if (node != null)
{
node._grid._inExpandCollapseMouseCapture = true;
if (node.IsExpanded)
node.Collapse();
else
node.Expand();
}
}
}
public HierarchicalGridNode OwningNode
{
get { return base.OwningRow as HierarchicalGridNode; }
}
}
public class HierarchicalGridColumn : DataGridViewTextBoxColumn
{
internal Image _defaultNodeImage;
public HierarchicalGridColumn()
{
this.CellTemplate = new TreeGridCell();
}
// Need to override Clone for design-time support.
public override object Clone()
{
HierarchicalGridColumn c = (HierarchicalGridColumn)base.Clone();
c._defaultNodeImage = this._defaultNodeImage;
return c;
}
public Image DefaultNodeImage
{
get { return _defaultNodeImage; }
set { _defaultNodeImage = value; }
}
}
}
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