/// <summary>
///
/// </summary>
/// <param name="e"></param>
protected virtual PointF OnInitializeItem(DrawLegendItemArgs e)
{
if (e.Item.LegendItemVisible == false) return e.TopLeft;
PointF topLeft = e.TopLeft;
PointF tempTopLeft = topLeft;
if (topLeft.Y > ControlRectangle.Bottom)
{
return topLeft; // drawing would be below the screen
}
if (topLeft.Y > ControlRectangle.Top - ItemHeight)
{
// Draw the item itself
// Point tl = new Point((int)topLeft.X, (int)topLeft.Y);
LegendBox itemBox = new LegendBox();
_legendBoxes.Add(itemBox);
itemBox.Item = e.Item;
itemBox.Bounds = new Rectangle(0, (int)topLeft.Y, Width, ItemHeight);
itemBox.Indent = (int)topLeft.X / _indentation;
DrawPlusMinus(e.Graphics, ref tempTopLeft, itemBox);
int ih = ItemHeight;
if (e.Item.LegendSymbolMode == SymbolMode.Symbol)
{
Size s = e.Item.GetLegendSymbolSize();
if (s.Height > ih) tempTopLeft.Y += 3;
}
if (e.Item.LegendSymbolMode == SymbolMode.Symbol || e.Item.LegendSymbolMode == SymbolMode.GroupSymbol)
{
DrawSymbol(e.Graphics, ref tempTopLeft, itemBox);
}
if (e.Item.LegendSymbolMode == SymbolMode.Checkbox)
{
DrawCheckBoxes(e.Graphics, ref tempTopLeft, itemBox);
}
int width = (int)e.Graphics.MeasureString(e.Item.LegendText, Font).Width;
int dY = 0;
if (e.Item.LegendSymbolMode == SymbolMode.Symbol)
{
Size s = e.Item.GetLegendSymbolSize();
if (s.Height > ih) dY = (s.Height - ih) / 2;
tempTopLeft.Y += dY;
}
tempTopLeft.Y += (ih - Font.Height) / (float)2;
itemBox.Textbox = new Rectangle((int)tempTopLeft.X, (int)topLeft.Y + dY, width, ItemHeight);
if (itemBox.Item.IsSelected)
{
if (_selection.Contains(itemBox) == false) _selection.Add(itemBox);
Rectangle innerBox = itemBox.Textbox;
innerBox.Inflate(-1, -1);
Brush b = HighlightBrush(innerBox);
e.Graphics.FillRectangle(b, innerBox);
b.Dispose();
SymbologyGlobal.DrawRoundedRectangle(e.Graphics, _highlightBorderPen, itemBox.Textbox);
e.Graphics.DrawString(e.Item.LegendText, Font, _selectionFontBrush, tempTopLeft);
}
else
{
e.Graphics.DrawString(e.Item.LegendText, Font, Brushes.Black, tempTopLeft);
}
}
int h = ItemHeight;
if (e.Item.LegendSymbolMode == SymbolMode.Symbol)
{
Size s = e.Item.GetLegendSymbolSize();
if (s.Height > h) h = s.Height + 6;
}
topLeft.Y += h;
if (e.Item.IsExpanded)
{
topLeft.X += _indentation;
if (e.Item.LegendItems != null)
{
List<ILegendItem> items = e.Item.LegendItems.ToList();
if (e.Item is IGroup) items.Reverse(); // reverse layers because of drawing order, don't bother reversing categories.
foreach (ILegendItem item in items)
{
DrawLegendItemArgs args = new DrawLegendItemArgs(e.Graphics, item, e.ClipRectangle, topLeft);
topLeft = OnInitializeItem(args);
if (topLeft.Y > ControlRectangle.Bottom) break;
}
}
topLeft.X -= _indentation;
}
return topLeft;
}
/// <summary>
/// Extends initialize to draw "non-selected" elements.
/// </summary>
/// <param name="e"></param>
protected override void OnInitialize(PaintEventArgs e)
{
// draw standard background image to buffer
base.OnInitialize(e);
PointF topLeft = new Point(0, 0);
if (_rootNodes == null || _rootNodes.Count == 0) return;
_legendBoxes = new List<LegendBox>();
foreach (ILegendItem item in _rootNodes)
{
DrawLegendItemArgs args = new DrawLegendItemArgs(e.Graphics, item, ClientRectangle, topLeft);
OnInitializeItem(args);
topLeft.Y += SizeItem((int)topLeft.X, item, e.Graphics).Height;
}
}
