private int DrawItem(Rect area, TreeViewItem item, int index, int depth)
{
bool selected = selection.Contains(item.Tag);
Rect itemRegion = new Rect(0, (index * TreeViewItem.HEIGHT) - (scroll * TreeViewItem.HEIGHT), area.width, TreeViewItem.HEIGHT * item.Count);
if (ItemDrawBackground != null)
{
ItemDrawBackground(item, itemRegion);
}
item.DrawBackground(itemRegion, depth, selected);
if (ItemDraw != null)
{
ItemDraw(item, itemRegion);
}
if (Event.current.type == EventType.MouseDown)
{
if (Event.current.button == 0)
{
if (Event.current.clickCount == 1 && SelectionClicked != null)
{
SelectionClicked();
}
if (Event.current.clickCount == 2 && SelectionDoubleClicked != null)
{
SelectionDoubleClicked();
}
}
else if (Event.current.button == 1)
{
if (SelectionRightClicked != null)
{
SelectionRightClicked();
}
}
if (!item.Editing && Event.current.button == 0)
{
if (item.Items.Count > 0)
{
Rect openRegion = new Rect(itemRegion.x + (depth * TreeViewItem.HEIGHT / 2), itemRegion.y, TreeViewItem.HEIGHT, TreeViewItem.HEIGHT);
if (openRegion.Contains(Event.current.mousePosition))
{
item.Open = !item.Open;
Event.current.Use();
repaint = true;
}
}
if (Event.current.type != EventType.Used && item.Enabled && item.Selectable)
{
Rect mouseRegion = new Rect(itemRegion.x, itemRegion.y, itemRegion.width, TreeViewItem.HEIGHT);
if (mouseRegion.Contains(Event.current.mousePosition))
{
Select(index, item.Tag);
Event.current.Use();
}
if (selection.Contains(item.Tag))
{
Dragged = true;
}
}
}
}
else if (Event.current.type == EventType.MouseUp)
{
dragging = false;
Dragged = false;
}
else if (Event.current.type == EventType.MouseDrag && Dragged)
{
Rect mouseRegion = new Rect(itemRegion.x, itemRegion.y, itemRegion.width, TreeViewItem.HEIGHT);
if (mouseRegion.Contains(Event.current.mousePosition))
{
DragAndDrop.PrepareStartDrag();
List <UnityEngine.Object> objs = new List <UnityEngine.Object>();
foreach (object o in selection)
{
if (o is UnityEngine.Object)
{
objs.Add(o as UnityEngine.Object);
}
}
DragDropWrapper wrapper = new DragDropWrapper("TreeView", selection);
DragAndDrop.objectReferences = objs.ToArray();
DragAndDrop.SetGenericData("TreeView", wrapper);
DragAndDrop.StartDrag("TreeView");
DragAndDrop.visualMode = DragAndDropVisualMode.Move;
dragging = true;
Dragged = false;
mayEdit = false;
if (item.Editing)
{
item.Editing = false;
}
Event.current.Use();
}
}
else if (Event.current.type == EventType.DragUpdated && CanDrop)
{
Rect mouseRegion = new Rect(itemRegion.x, itemRegion.y + 1, itemRegion.width, TreeViewItem.HEIGHT - 2);
if (mouseRegion.Contains(Event.current.mousePosition) && !selection.Contains(item.Tag))
{
item.Highlighted = true;
item.InBetween = false;
}
else
{
item.Highlighted = false;
if (canDropInBetween)
{
Rect inBetweenRect = new Rect(itemRegion.x, itemRegion.y - 1, itemRegion.width, 2);
if (inBetweenRect.Contains(Event.current.mousePosition))
{
item.InBetween = true;
}
else
{
item.InBetween = false;
}
}
}
repaint = true;
}
else if (Event.current.type == EventType.DragPerform && CanDrop)
{
dragging = false;
if (item.Highlighted || item.InBetween)
{
target = item.Tag;
inBetween = item.InBetween;
Event.current.Use();
}
}
else
{
Rect mouseRegion = new Rect(itemRegion.x, itemRegion.y, itemRegion.width, TreeViewItem.HEIGHT);
if (mouseRegion.Contains(Event.current.mousePosition))
{
mouseHover = index;
}
}
if (mayEdit && index == mouseHover)
{
mayEdit = false;
Dragged = false;
item.Editing = true;
}
item.Draw(itemRegion, depth, selected);
index++;
if (item.Open)
{
foreach (TreeViewItem child in item.VisibleItems)
{
index = DrawItem(area, child, index, depth + 1);
}
}
return(index);
}
public bool Draw(Rect region)
{
height = region.height;
float visibleCount = height / TreeViewItem.HEIGHT;
int count = Count;
if (visibleCount < count)
{
if (Event.current != null && Event.current.type == EventType.ScrollWheel && region.Contains(Event.current.mousePosition))
{
scroll += Event.current.delta.y;
scroll = Mathf.Clamp(scroll, 0, count);
repaint = true;
}
float half = SCROLLBAR_WIDTH / 2;
Rect scrollbar;
if (scrollbarRight)
{
scrollbar = new Rect(region.xMax - half, region.y, SCROLLBAR_WIDTH, region.height);
}
else
{
scrollbar = new Rect(region.xMin, region.y, SCROLLBAR_WIDTH, region.height);
}
scroll = GUI.VerticalScrollbar(scrollbar, scroll, visibleCount, 0, count);
if (scrollbarRight)
{
region = new Rect(region.x, region.y, region.width - half, region.height);
}
else
{
region = new Rect(region.x + half, region.y, region.width - half, region.height);
}
}
GUILayout.BeginArea(region);
int index = 0;
foreach (TreeViewItem item in visibleItems)
{
index = DrawItem(region, item, index, 0);
}
GUILayout.EndArea();
// Outside the list of object
if (Event.current.type == EventType.MouseDown && Event.current.button == 0 && region.Contains(Event.current.mousePosition))
{
if (!AlwaysSelect && OutsideClickUnselect)
{
selection.Clear();
if (SelectionChanged != null)
{
SelectionChanged();
}
}
}
else if (Event.current.type == EventType.DragUpdated && CanDrop)
{
object data = DragAndDrop.GetGenericData("TreeView");
if (data != null && data is DragDropWrapper)
{
DragDropWrapper wrapper = data as DragDropWrapper;
if (wrapper.Type == "TreeView")
{
DragAndDrop.visualMode = DragAndDropVisualMode.Move;
if (new Rect(region.x, region.y, region.width, TreeViewItem.HEIGHT).Contains(Event.current.mousePosition))
{
timer = EditorApplication.timeSinceStartup + DRAG_SCROLL_DELAY;
scroll = Mathf.Clamp(scroll - 1, 0, count);
}
else if (new Rect(region.x, region.yMax - TreeViewItem.HEIGHT, region.width, TreeViewItem.HEIGHT).Contains(Event.current.mousePosition))
{
timer = EditorApplication.timeSinceStartup + DRAG_SCROLL_DELAY;
scroll = Mathf.Clamp(scroll + 1, 0, count);
}
}
}
}
else if (CanDrop && (Event.current.type == EventType.DragPerform || (target != null && CanDropOnSelf)))
{
if (DragDropped != null)
{
DragDropped(this, new DragEventArgs(target, inBetween, selection.ToArray()));
}
target = null;
Event.current.Use();
TurnOffHighlight(visibleItems);
}
else if (Event.current.type == EventType.DragExited)
{
TurnOffHighlight(visibleItems);
}
if (repaint)
{
repaint = false;
return(true);
}
else
{
return(false);
}
}