/// <summary>
/// Constructor</summary>
/// <param name="style">Style</param>
/// <param name="owner">Owner</param>
internal TheTreeListView(Style style, TreeListView owner)
{
m_style = style;
m_owner = owner;
OwnerDraw = true;
base.DoubleBuffered = true;
SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
MouseMove += ListTreeViewMouseMove; // for a workaround
DrawColumnHeader += ListTreeViewDrawColumnHeader;
DrawItem += ListTreeViewDrawItem;
DrawSubItem += ListTreeViewDrawSubItem;
// default colors & such
BorderStyle = BorderStyle.Fixed3D;
m_textColor = SystemColors.ControlText;
m_modifiableTextColor = Color.Red;
m_highlightTextColor = SystemColors.HighlightText;
m_modifiableHighlightTextColor = SystemColors.ControlText;
BackColor = SystemColors.ControlLightLight;
m_disabledTextColor = SystemColors.GrayText;
m_highlightBackColor = ((SolidBrush)SystemBrushes.Highlight).Color;
m_disabledBackColor = ((SolidBrush)SystemBrushes.Control).Color;
m_gridLinesColor = DefaultBackColor;
m_expanderGradient =
new ControlGradient
{
StartColor = Color.White,
EndColor = Color.LightGray,
LinearGradientMode = LinearGradientMode.Vertical
};
m_expanderPen = Pens.Black;
m_hierarchyLinePen = Pens.DarkGray;
//m_columnHeaderGradient =
// new ControlGradient
// {
// StartColor = Color.White,
// EndColor = Color.FromArgb(255, 242, 243, 245),
// LinearGradientMode = LinearGradientMode.Vertical,
// TextColor = SystemColors.ControlText
// };
//m_columnHeaderSeparatorColor = Color.FromArgb(255, 213, 213, 213);
}
private static void DrawCollapser(Graphics gfx, Rectangle bounds, ControlGradient expanderGradient, Pen expanderPen, Pen hierarchyLinePen, bool bItemBelow)
{
const int iRectOffset = 5;
const int iTwoTimesRectOffset = iRectOffset * 2;
const int iLineOffset = 3;
Point center =
new Point(
bounds.X + (bounds.Width / 2),
bounds.Y + (bounds.Height / 2));
// Rectangle around the "-"
DrawExpanderButton(
gfx,
new Rectangle(
center.X - iRectOffset,
center.Y - iRectOffset,
iTwoTimesRectOffset,
iTwoTimesRectOffset),
expanderGradient,
hierarchyLinePen);
// Horizontal line of the "-"
gfx.DrawLine(
expanderPen,
center.X - iLineOffset,
center.Y,
center.X + iLineOffset,
center.Y);
if (!bItemBelow)
return;
// Vertical line below the rectangle
// that connects to the item below
gfx.DrawLine(
hierarchyLinePen,
center.X,
center.Y + iRectOffset,
center.X,
bounds.Bottom);
}
private static void DrawExpander(Graphics gfx, Rectangle bounds, ControlGradient expanderGradient, Pen expanderPen, Pen hierarchyLinePen)
{
const int iRectOffset = 5;
const int iTwoTimesRectOffset = iRectOffset * 2;
const int iLineOffset = 3;
Point center =
new Point(
bounds.X + (bounds.Width / 2),
bounds.Y + (bounds.Height / 2));
// Rectangle around the "+"
DrawExpanderButton(
gfx,
new Rectangle(
center.X - iRectOffset,
center.Y - iRectOffset,
iTwoTimesRectOffset,
iTwoTimesRectOffset),
expanderGradient,
hierarchyLinePen);
// Horizontal line of the "+"
gfx.DrawLine(
expanderPen,
center.X - iLineOffset,
center.Y,
center.X + iLineOffset,
center.Y);
// Vertical line of the "+"
gfx.DrawLine(
expanderPen,
center.X,
center.Y - iLineOffset,
center.X,
center.Y + iLineOffset);
}
private static void DrawExpanderButton(Graphics gfx, Rectangle bounds, ControlGradient expanderGradient, Pen hierarchyLinePen)
{
using (Brush brush = new LinearGradientBrush(
bounds,
expanderGradient.StartColor,
expanderGradient.EndColor,
expanderGradient.LinearGradientMode))
{
gfx.FillRectangle(brush, bounds);
gfx.DrawRectangle(hierarchyLinePen, bounds);
}
}
private static void DrawExtraneousStuff(DrawListViewSubItemEventArgs e, ref int iOffset, ControlGradient expanderGradient, Pen expanderPen, Pen hierarchyLinePen)
{
if (e.Item.Tag == null)
return;
// Not an item that requires expander/collapser
// or hierarchy lines so bail
if (!e.Item.Tag.Is<Node>())
return;
// This node
Node nodeThis = e.Item.Tag.As<Node>();
// Early out for special 'root' level items
if (nodeThis.IsLeaf && (nodeThis.Level == 1))
{
iOffset += ExtraneousItemWidth;
return;
}
// Find out if there's a visible sibling node
Node nodeSibling;
FindSibling(nodeThis, out nodeSibling);
bool bHasSibling = nodeSibling != null;
// Find out if there's a visible child node
Node nodeChild;
FindChild(nodeThis, out nodeChild);
bool bHasChild = nodeChild != null;
//
// Node levels start @ 1 not 0
//
// From left to right start drawing any hierarchy
// lines and/or collapser/expander images
for (int i = 0; i < nodeThis.Level; i++)
{
//
// Set stuff up for the current iteration
//
Point posCur = new Point(e.Item.Bounds.X + iOffset, e.Item.Bounds.Y);
Size sizeCur = new Size(ExtraneousItemWidth, e.Item.Bounds.Height);
Rectangle rectBounds = new Rectangle(posCur, sizeCur);
//
// Try to do some drawing
//
// Try and find an expanded item above us (tells us
// what type of line we need to draw - if any)
Node nodeRelative;
FindExpandedRelativeAboveAtLevel(nodeThis, i + 1, out nodeRelative);
if (nodeRelative != null)
{
if (nodeRelative == nodeThis.Parent)
DrawElbow(e.Graphics, rectBounds, hierarchyLinePen, bHasSibling);
}
// Check for drawing vertical line(s)
{
bool bDrawVerticalLine = false;
// Find ancestor that's one level above the "current"
// (ie. i + 1) level and see if they have a sibling
Node nodeTemp;
FindExpandedRelativeAboveAtLevel(nodeThis, i + 2, out nodeTemp);
if (nodeTemp != null)
{
Node nodeTempSibling;
FindSibling(nodeTemp, out nodeTempSibling);
if (nodeTempSibling != null)
bDrawVerticalLine = true;
}
if (bDrawVerticalLine)
DrawVerticalLine(e.Graphics, rectBounds, hierarchyLinePen);
}
// Check if need an expander/collapser
bool bDrawExpanderCollapser =
(i == (nodeThis.Level - 1)) &&
(nodeThis.HasChildren || !nodeThis.IsLeaf);
// Draw expander/collapser
if (bDrawExpanderCollapser)
{
if (nodeThis.Expanded)
DrawCollapser(e.Graphics, rectBounds, expanderGradient, expanderPen, hierarchyLinePen, bHasChild);
else
DrawExpander(e.Graphics, rectBounds, expanderGradient, expanderPen, hierarchyLinePen);
// Set the are that can be clicked
nodeThis.HitRect = rectBounds;
}
// Check if horizontal line needed
bool bDrawHorizontalLine =
(i == (nodeThis.Level - 1)) &&
(i > 0) &&
!bDrawExpanderCollapser;
if (bDrawHorizontalLine)
DrawHorizontalLine(e.Graphics, rectBounds, hierarchyLinePen);
// Keep indenting
iOffset += ExtraneousItemWidth;
}
}
private static ControlGradient GetControlGradientFromDockPanelGradient(DockPanelGradient dockPanelGradient)
{
var controlGradient = new ControlGradient()
{
StartColor = dockPanelGradient.StartColor,
EndColor = dockPanelGradient.EndColor,
LinearGradientMode = dockPanelGradient.LinearGradientMode
};
var tabGradient = dockPanelGradient as TabGradient;
if (tabGradient != null)
controlGradient.TextColor = tabGradient.TextColor;
return controlGradient;
}
private static TabGradient GetTabGradientFromControlGradient(ControlGradient controlGradient)
{
return new TabGradient()
{
StartColor = controlGradient.StartColor,
EndColor = controlGradient.EndColor,
LinearGradientMode = controlGradient.LinearGradientMode,
TextColor = controlGradient.TextColor
};
}
