Fl_Tree_items are not lightweight text nodes they basically duplicate
several data members of Fl_Widget so when we add an widget to it we have
basically two widgets to use one right now.
class FL_EXPORT Fl_Tree_Item {
const char *_label; // label (memory managed)
Fl_Font _labelfont; // label's font face
Fl_Fontsize _labelsize; // label's font size
Fl_Color _labelfgcolor; // label's fg color
Fl_Color _labelbgcolor; // label's bg color
char _open; // item is open?
char _visible; // item is visible?
char _active; // item activated?
char _selected; // item selected?
int _xywh[4]; // xywh of this widget (if
visible)
int _collapse_xywh[4]; // xywh of collapse icon (if
any)
int _label_xywh[4]; // xywh of label
Fl_Widget *_widget; // item's label widget
(optional)
Fl_Image *_usericon; // item's user-specific icon
(optional)
Fl_Tree_Item_Array _children; // array of child items
Fl_Tree_Item *_parent; // parent item (=0 if root)
void *_userdata; // user data that can be
associated with an item
#if FLTK_ABI_VERSION >= 10302
Fl_Tree_Item *_prev_sibling; // previous sibling (same level)
Fl_Tree_Item *_next_sibling; // next sibling (same level)
#endif /*FLTK_ABI_VERSION*/
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