public void RecalcLayout()
{
if (m_firstVisibleNode == null)
{
m_firstVisibleNode = Nodes.FirstNode;
}
if (Nodes.Count == 0)
{
m_firstVisibleNode = null;
}
UpdateScrollBars();
int vscroll = VScrollValue();
if (vscroll == 0)
{
m_firstVisibleNode = Nodes.FirstNode;
}
else
{
m_firstVisibleNode = NodeCollection.GetNextNode(Nodes.FirstNode, vscroll);
}
Invalidate();
}
public RecursiveNodesEnumerator(NodeCollection collection, bool mustBeVisible)
{
m_enumerator = new NodeCollIterator(collection, mustBeVisible);
}
public NodeCollIterator(NodeCollection collection, bool mustBeVisible)
{
m_firstNode = collection.FirstNode;
m_visible = mustBeVisible;
}
protected override void OnKeyDown(KeyEventArgs e)
{
Node newnode = null;
if (e.KeyCode == Keys.PageUp)
{
int remainder = 0;
int diff = MaxVisibleRows(out remainder) - 1;
newnode = NodeCollection.GetNextNode(FocusedNode, -diff);
if (newnode == null)
{
newnode = Nodes.FirstVisibleNode();
}
}
if (e.KeyCode == Keys.PageDown)
{
int remainder = 0;
int diff = MaxVisibleRows(out remainder) - 1;
newnode = NodeCollection.GetNextNode(FocusedNode, diff);
if (newnode == null)
{
newnode = Nodes.LastVisibleNode(true);
}
}
if (e.KeyCode == Keys.Down)
{
newnode = NodeCollection.GetNextNode(FocusedNode, 1);
}
if (e.KeyCode == Keys.Up)
{
newnode = NodeCollection.GetNextNode(FocusedNode, -1);
}
if (e.KeyCode == Keys.Home)
{
newnode = Nodes.FirstNode;
}
if (e.KeyCode == Keys.End)
{
newnode = Nodes.LastVisibleNode(true);
}
if (e.KeyCode == Keys.Left)
{
if (FocusedNode != null)
{
if (FocusedNode.Expanded)
{
FocusedNode.Collapse();
EnsureVisible(FocusedNode);
return;
}
if (FocusedNode.Parent != null)
{
FocusedNode = FocusedNode.Parent;
EnsureVisible(FocusedNode);
}
}
}
if (e.KeyCode == Keys.Right)
{
if (FocusedNode != null)
{
if (FocusedNode.Expanded == false && FocusedNode.HasChildren)
{
FocusedNode.Expand();
EnsureVisible(FocusedNode);
return;
}
if (FocusedNode.Expanded == true && FocusedNode.HasChildren)
{
FocusedNode = FocusedNode.Nodes.FirstNode;
EnsureVisible(FocusedNode);
}
}
}
if (newnode != null)
{
if (MultiSelect)
{
// tree behavior is
// keys none, the selected node is added as the focused and selected node
// keys control, only focused node is moved, the selected nodes collection is not modified
// keys shift, selection from first selected node to current node is done
if (Control.ModifierKeys == Keys.Control)
{
FocusedNode = newnode;
}
else
{
MultiSelectAdd(newnode, Control.ModifierKeys);
}
}
else
{
FocusedNode = newnode;
}
EnsureVisible(FocusedNode);
}
base.OnKeyDown(e);
}
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
int hScrollOffset = HScrollValue();
int remainder = 0;
int visiblerows = MaxVisibleRows(out remainder);
if (remainder > 0)
{
visiblerows++;
}
bool drawColumnHeaders = true;
// draw columns
if (drawColumnHeaders)
{
Rectangle headerRect = e.ClipRectangle;
Columns.Draw(e.Graphics, headerRect, hScrollOffset);
}
// draw vertical grid lines
if (ViewOptions.ShowGridLines)
{
// visible row count
int remainRows = Nodes.VisibleNodeCount - m_vScroll.Value;
if (visiblerows > remainRows)
{
visiblerows = remainRows;
}
Rectangle fullRect = ClientRectangle;
if (drawColumnHeaders)
{
fullRect.Y += Columns.Options.HeaderHeight;
}
fullRect.Height = visiblerows * RowOptions.ItemHeight;
Columns.Painter.DrawVerticalGridLines(Columns, e.Graphics, fullRect, hScrollOffset);
}
int visibleRowIndex = 0;
TreeListColumn[] visibleColumns = this.Columns.VisibleColumns;
int columnsWidth = Columns.ColumnsWidth;
foreach (Node node in NodeCollection.ForwardNodeIterator(m_firstVisibleNode, true))
{
Rectangle rowRect = CalcRowRecangle(visibleRowIndex);
if (rowRect == Rectangle.Empty || rowRect.Bottom <= e.ClipRectangle.Top || rowRect.Top >= e.ClipRectangle.Bottom)
{
if (visibleRowIndex > visiblerows)
{
break;
}
visibleRowIndex++;
continue;
}
rowRect.X = RowHeaderWidth() - hScrollOffset;
rowRect.Width = columnsWidth;
// draw horizontal grid line for current node
if (ViewOptions.ShowGridLines)
{
Rectangle r = rowRect;
r.X = RowHeaderWidth();
r.Width = columnsWidth - hScrollOffset;
m_rowPainter.DrawHorizontalGridLine(e.Graphics, r);
}
// draw the current node
PaintNode(e.Graphics, rowRect, node, visibleColumns, visibleRowIndex);
// drow row header for current node
Rectangle headerRect = rowRect;
headerRect.X = 0;
headerRect.Width = RowHeaderWidth();
int absoluteRowIndex = visibleRowIndex + VScrollValue();
headerRect.Width = RowHeaderWidth();
m_rowPainter.DrawHeader(e.Graphics, headerRect, absoluteRowIndex == m_hotrow);
visibleRowIndex++;
}
}