/// <summary>
/// Helper function that indicates if given collection is the root.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <returns></returns>
public virtual bool IsRootCollection(TreeControl tc, NodeCollection nc)
{
return(tc.Nodes == nc);
}
/// <summary>
/// Process a left mouse down on the Node instance.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="n">Reference to Node within collection.</param>
/// <param name="pt">Point being pressed down.</param>
/// <returns>true if the point was processed; otherwise false.</returns>
public virtual bool DoubleClick(TreeControl tc, NodeCollection nc, Node n, Point pt)
{
// Not processed
return(false);
}
/// <summary>
/// Draw the NodeCollection instance.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="g">Reference to Graphics instance to draw into.</param>
/// <param name="clipRectangle">Clipping rectangle used when drawing.</param>
/// <param name="preDraw">True when drawing before children and fales for drawing after.</param>
public virtual void Draw(TreeControl tc,
NodeCollection nc,
Graphics g,
Rectangle clipRectangle,
bool preDraw)
{
if (preDraw)
{
// Only draw lines and boxes if there is at least one child node
if (nc.VisibleCount > 0)
{
// Find out if lines and boxes needed drawing
bool showLines = ShowLines(tc, nc);
bool showBoxes = ShowBoxes(tc, nc);
bool showIndicators = (IsRootCollection(tc, nc) && (tc.Indicators != Indicators.None)) ||
(!IsRootCollection(tc, nc) && (tc.Indicators == Indicators.AtGroup));
// Is there any drawing to perform?
if (showLines || showBoxes || showIndicators)
{
Pen lineDashPen = tc.GetCacheLineDashPen();
// Cache the whole rectangle used for drawing
Rectangle ncBounds = nc.Cache.Bounds;
// Find the size of space taken up with indicators
Size indicatorSize = showIndicators ? tc.IndicatorSize : Size.Empty;
// Perform any adjustment for drawing within the bounds
AdjustBeforeDrawing(tc, nc, ref ncBounds);
// Cache the mid and right hand side of the lines column
int xMid = ncBounds.Left + indicatorSize.Width + (tc.ColumnWidth / 2) - 1;
int xRight = ncBounds.Left + indicatorSize.Width + tc.ColumnWidth;
// Need to adjust drawing child connecting lines, so that wider than one
// pixel pens start from left of vertical for top and bottom children, but
// are placed to the right of middle children.
int xMidAdjustL = xMid - (tc.LineWidth / 2);
int xMidAdjustR = xMid + 1;
// Find the first and last visible nodes
int firstVisible = nc.FirstVisibleIndex;
int lastVisible = nc.LastVisibleIndex;
// Find the first and last nodes mid points
int yMidFirst = nc[firstVisible].Cache.Bounds.Top + (nc[firstVisible].Cache.Bounds.Height / 2);
int yMidLast = nc[lastVisible].Cache.Bounds.Top + (nc[lastVisible].Cache.Bounds.Height / 2);
// No point drawing line after end of clipping rectangle
if (yMidLast > clipRectangle.Bottom)
{
yMidLast = clipRectangle.Bottom;
}
// Do we need to draw the long vertical line?
if (showLines)
{
// Draw the long vertical line down the middle
if (IsRootCollection(tc, nc))
{
// No point drawing line before start of clipping rectangle
if (yMidFirst < clipRectangle.Top)
{
yMidFirst = clipRectangle.Top;
// Adjust starting point up so dot/dash lines are consistent
switch (tc.LineDashStyle)
{
case LineDashStyle.Dot:
yMidFirst -= yMidFirst % (2 * tc.LineWidth);
break;
case LineDashStyle.Dash:
yMidFirst -= yMidFirst % (4 * tc.LineWidth);
break;
}
}
// We are root collection, so draw from the first node to the last
g.DrawLine(lineDashPen, xMid, yMidFirst, xMid, yMidLast);
}
else
{
// Not at root, so draw from top of column to the last node
g.DrawLine(lineDashPen, xMid, ncBounds.Top, xMid, yMidLast);
}
}
// Process each child node in turn, drawing horizontal line and any box
for (int i = nc.ChildFromY(clipRectangle.Top); i < nc.Count; i++)
{
if (DrawNode(tc, nc[i], g, clipRectangle, showLines, showBoxes,
showIndicators, (i == 0) || (i == (nc.Count - 1)),
lineDashPen, xMidAdjustL, xMidAdjustR, xMid, xRight,
ncBounds.Left))
{
break;
}
}
}
}
}
}
/// <summary>
/// Adjust the total bounds of the collection into the bounds available for drawing.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="ncBounds">Drawing bounds to draw within.</param>
public virtual void AdjustBeforeDrawing(TreeControl tc, NodeCollection nc, ref Rectangle ncBounds)
{
// By default we having no changes to make
}
/// <summary>
/// Find if the provided rectangle intersects the bounds of the node collection.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="rectangle">Rectangle to compare against.</param>
/// <returns>True if intersecting; otherwise false.</returns>
public virtual bool IntersectsWith(TreeControl tc, NodeCollection nc, Rectangle rectangle)
{
return(nc.Cache.Bounds.IntersectsWith(rectangle));
}
/// <summary>
/// Defines the bounding rectangle of the collection.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="bounds">Bounding rectangle of collection.</param>
public virtual void SetBounds(TreeControl tc, NodeCollection nc, Rectangle bounds)
{
// Update cache bounds using new value
nc.Cache.Bounds = bounds;
}
private void SynchronizeCollections(NodeCollection orig,
NodeCollection copy,
ITypeDescriptorContext context)
{
// Make a note of all original nodes that are still in copy
Hashtable both = new Hashtable();
// First pass, scan looking for nodes that are in original and copy
foreach (Node copyChild in copy)
{
// Does this node have an back pointer to its original?
if (copyChild.Original != null)
{
// Then make a note that it is in both collections
both.Add(copyChild.Original, copyChild.Original);
// Update the original from the copy
copyChild.Original.UpdateInstance(copyChild);
}
}
int origCount = orig.Count;
// Second pass, remove nodes in the original but not in the copy
for (int i = 0; i < origCount; i++)
{
// Get access to the indexed node from original
Node origChild = orig[i];
// If not in the found collection...
if (!both.ContainsKey(origChild))
{
// ...then it has been removed from the copy, so delete it
orig.Remove(origChild);
// Must remove from context container so it is removed from designer tray
context.Container.Remove(origChild as IComponent);
// Reduce the count and index to reflect change in collection contents
--i;
--origCount;
}
}
int copyCount = copy.Count;
// Third pass, add new nodes from copy but not in original
for (int i = 0; i < copyCount; i++)
{
// Get access to the indexed node from copy
Node copyChild = copy[i];
// If this node is a new one then it will not have an 'original' property
if (copyChild.Original == null)
{
// Add this node into the original at indexed position
orig.Insert(i, copyChild);
// Must add into context container so it is added to the designer tray
context.Container.Add(copyChild as IComponent);
}
}
// Fourth pass, process all children
foreach (Node copyChild in copy)
{
// Does this node has an back pointer to its original?
if (copyChild.Original != null)
{
// Recurse down into the child collections
SynchronizeCollections(copyChild.Original.Nodes, copyChild.Nodes, context);
}
}
}
/// <summary>
/// Helper function that indicates if given collection is the root.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <returns></returns>
public override bool IsRootCollection(TreeControl tc, NodeCollection nc)
{
return((nc.ParentNode != null) &&
(nc.ParentNode.ParentNodes == tc.Nodes));
}
/// <summary>
/// Draw the NodeCollection instance.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
/// <param name="nc">Reference to NodeCollection instance.</param>
/// <param name="g">Reference to Graphics instance to draw into.</param>
/// <param name="clipRectangle">Clipping rectangle used when drawing.</param>
/// <param name="preDraw">True when drawing before children and fales for drawing after.</param>
public override void Draw(TreeControl tc,
NodeCollection nc,
Graphics g,
Rectangle clipRectangle,
bool preDraw)
{
// The real root never has anything to draw
if (!IsRealRootCollection(tc, nc))
{
// Let base class do its stuff
base.Draw(tc, nc, g, clipRectangle, preDraw);
// Only draw the extra separating lines and image column after children are drawn
if (!preDraw)
{
// The root within each group might have something to do
if (IsRootCollection(tc, nc))
{
// Do we need to account for the image box column?
if (tc.GroupImageBox && tc.GroupImageBoxColumn)
{
// Recover the actual control drawing area in node space
Rectangle drawRect = tc.ClientToNodeSpace(tc.DrawRectangle);
// Get the bounding rectangle of the collection
Rectangle ncBounds = nc.Cache.Bounds;
// If this the first visible collection
bool firstVisibleCollection = (ncBounds.Top <= drawRect.Top) && (ncBounds.Bottom >= drawRect.Top);
// Adjust backwards to account for group indent
ncBounds.X -= tc.GroupIndentLeft;
// Adjust to just the image column width
ncBounds.Width = tc.GroupImageBoxWidth;
// Draw the image column color
g.FillRectangle(tc.GetCacheGroupImageBoxColumnBrush(), ncBounds);
// Draw the separator line on right hand side of column
g.DrawLine(tc.GetCacheGroupImageBoxLinePen(), ncBounds.Right, ncBounds.Top,
ncBounds.Right, ncBounds.Bottom - 1);
// We draw top and bottom collection separators, if we have no border
if (tc.BorderStyle == TreeBorderStyle.None)
{
// Draw the separator line on right side of control
g.DrawLine(tc.GetCacheGroupImageBoxLinePen(), drawRect.Right - 1, ncBounds.Top,
drawRect.Right - 1, ncBounds.Bottom - 1);
// The first collection drawn on the control...
if (firstVisibleCollection)
{
// ...needs a top line separator
g.DrawLine(tc.GetCacheGroupImageBoxLinePen(), ncBounds.Right, drawRect.Top,
drawRect.Right - 1, drawRect.Top);
}
bool lastSibling = true;
// Then search siblings...
for (int i = nc.ParentNode.Index + 1; i < nc.ParentNode.ParentNodes.Count; i++)
{
Node next = nc.ParentNode.ParentNodes[i];
// For a node that is visible...
if (next.Visible)
{
lastSibling = false;
break;
}
}
// If the last sibling, or collection runs off end of control
if (lastSibling || (ncBounds.Bottom > drawRect.Bottom))
{
// Find the bottom line for drawing
int bottom = ncBounds.Bottom - 1;
// If we party run off end of the control the use end of control instead
if (bottom >= drawRect.Bottom)
{
bottom = drawRect.Bottom - 1;
}
// ...then draw separator line at bottom of collection
g.DrawLine(tc.GetCacheGroupImageBoxLinePen(), ncBounds.Right, bottom,
drawRect.Right - 1, bottom);
}
}
}
}
}
}
}
