fltk/src/Fl_Tree_Item.cxx

//
// "$Id$"
//

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Tree_Item.H>
#include <FL/Fl_Tree_Prefs.H>
#include <FL/Fl_Tree.H>

//////////////////////
// Fl_Tree_Item.cxx
//////////////////////
//
// Fl_Tree -- This file is part of the Fl_Tree widget for FLTK
// Copyright (C) 2009-2010 by Greg Ercolano.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file.  If this
// file is missing or damaged, see the license at:
//
//     http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
//     http://www.fltk.org/str.php
//
/////////////////////////////////////////////////////////////////////////// 80 /

// Was the last event inside the specified xywh?
static int event_inside(const int xywh[4]) {
  return(Fl::event_inside(xywh[0],xywh[1],xywh[2],xywh[3]));
}

/// Constructor.
///     Makes a new instance of Fl_Tree_Item using defaults from 'prefs'.
///
Fl_Tree_Item::Fl_Tree_Item(const Fl_Tree_Prefs &prefs) {
  _label        = 0;
  _labelfont    = prefs.labelfont();
  _labelsize    = prefs.labelsize();
  _labelfgcolor = prefs.labelfgcolor();
  _labelbgcolor = prefs.labelbgcolor();
  _widget       = 0;
#if FLTK_ABI_VERSION >= 10301
  _flags        = OPEN|VISIBLE|ACTIVE;
#else /*FLTK_ABI_VERSION*/
  _open         = 1;
  _visible      = 1;
  _active       = 1;
  _selected     = 0;
#endif /*FLTK_ABI_VERSION*/
  _xywh[0]      = 0;
  _xywh[1]      = 0;
  _xywh[2]      = 0;
  _xywh[3]      = 0;
  _collapse_xywh[0] = 0;
  _collapse_xywh[1] = 0;
  _collapse_xywh[2] = 0;
  _collapse_xywh[3] = 0;
  _label_xywh[0]    = 0;
  _label_xywh[1]    = 0;
  _label_xywh[2]    = 0;
  _label_xywh[3]    = 0;
  _usericon         = 0;
  _userdata         = 0;
  _parent           = 0;
#if FLTK_ABI_VERSION >= 10303
  _children.manage_item_destroy(1);	// let array's dtor manage destroying Fl_Tree_Items
#endif
#if FLTK_ABI_VERSION >= 10301
  _prev_sibling     = 0;
  _next_sibling     = 0;
#endif /*FLTK_ABI_VERSION*/
}

// DTOR
Fl_Tree_Item::~Fl_Tree_Item() {
  if ( _label ) { 
    free((void*)_label);
    _label = 0;
  }
  _widget = 0;			// Fl_Group will handle destruction
  _usericon = 0;		// user handled allocation
  //_children.clear();		// array's destructor handles itself
}

/// Copy constructor.
Fl_Tree_Item::Fl_Tree_Item(const Fl_Tree_Item *o) {
  _label        = o->label() ? strdup(o->label()) : 0;
  _labelfont    = o->labelfont();
  _labelsize    = o->labelsize();
  _labelfgcolor = o->labelfgcolor();
  _labelbgcolor = o->labelbgcolor();
  _widget       = o->widget();
#if FLTK_ABI_VERSION >= 10301
  _flags        = o->_flags;
#else /*FLTK_ABI_VERSION*/
  _open         = o->_open;
  _visible      = o->_visible;
  _active       = o->_active;
  _selected     = o->_selected;
#endif /*FLTK_ABI_VERSION*/
  _xywh[0]      = o->_xywh[0];
  _xywh[1]      = o->_xywh[1];
  _xywh[2]      = o->_xywh[2];
  _xywh[3]      = o->_xywh[3];
  _collapse_xywh[0] = o->_collapse_xywh[0];
  _collapse_xywh[1] = o->_collapse_xywh[1];
  _collapse_xywh[2] = o->_collapse_xywh[2];
  _collapse_xywh[3] = o->_collapse_xywh[3];
  _label_xywh[0]    = o->_label_xywh[0];
  _label_xywh[1]    = o->_label_xywh[1];
  _label_xywh[2]    = o->_label_xywh[2];
  _label_xywh[3]    = o->_label_xywh[3];
  _usericon         = o->usericon();
  _userdata         = o->user_data();
  _parent           = o->_parent;
#if FLTK_ABI_VERSION >= 10301
  _prev_sibling     = 0;		// do not copy ptrs! use update_prev_next()
  _next_sibling     = 0;		// do not copy ptrs! use update_prev_next()
#endif /*FLTK_ABI_VERSION*/
}

/// Print the tree as 'ascii art' to stdout.
/// Used mainly for debugging.
///
void Fl_Tree_Item::show_self(const char *indent) const {
  if ( label() ) {
#if FLTK_ABI_VERSION >= 10301
    printf("%s-%s (%d children, this=%p, parent=%p, prev=%p, next=%p, depth=%d)\n",
           indent,label(),children(),(void*)this, (void*)_parent,
	   _prev_sibling, _next_sibling, depth());
#else /*FLTK_ABI_VERSION*/
    printf("%s-%s (%d children, this=%p, parent=%p depth=%d)\n",
           indent,label(),children(),(void*)this, (void*)_parent, depth());
#endif /*FLTK_ABI_VERSION*/
  }
  if ( children() ) {
    char *i2 = (char*)malloc(strlen(indent) + 2);
    strcpy(i2, indent);
    strcat(i2, " |");
    for ( int t=0; t<children(); t++ ) {
      child(t)->show_self(i2);
    }
  }
  fflush(stdout);
}

/// Set the label. Makes a copy of the name.
void Fl_Tree_Item::label(const char *name) {
  if ( _label ) { free((void*)_label); _label = 0; }
  _label = name ? strdup(name) : 0;
}

/// Return the label.
const char *Fl_Tree_Item::label() const {
  return(_label);
}

/// Return child item for the specified 'index'.
const Fl_Tree_Item *Fl_Tree_Item::child(int index) const {
  return(_children[index]);
}

/// Clear all the children for this item.
void Fl_Tree_Item::clear_children() {
  _children.clear();
}

/// Return the index of the immediate child of this item that has the label 'name'.
///
/// \returns index of found item, or -1 if not found.
///
int Fl_Tree_Item::find_child(const char *name) {
  if ( name ) {
    for ( int t=0; t<children(); t++ ) {
      if ( child(t)->label() ) {
        if ( strcmp(child(t)->label(), name) == 0 ) {
          return(t);
        }
      }
    }
  }
  return(-1);
}

/// Find child item by descending array of names. Does not include self in search.
/// Only Fl_Tree should need this method.
///
/// \returns item, or 0 if not found
///
const Fl_Tree_Item *Fl_Tree_Item::find_child_item(char **arr) const {
  for ( int t=0; t<children(); t++ ) {
    if ( child(t)->label() ) {
      if ( strcmp(child(t)->label(), *arr) == 0 ) {	// match?
        if ( *(arr+1) ) {				// more in arr? descend
          return(_children[t]->find_item(arr+1));
        } else {					// end of arr? done
          return(_children[t]);
        }
      }
    }
  }
  return(0);
}

/// Find child item by descending array of names. Does not include self in search.
/// Only Fl_Tree should need this method. Use Fl_Tree::find_item() instead.
///
/// \returns item, or 0 if not found
///
Fl_Tree_Item *Fl_Tree_Item::find_child_item(char **arr) {
  for ( int t=0; t<children(); t++ ) {
    if ( child(t)->label() ) {
      if ( strcmp(child(t)->label(), *arr) == 0 ) {	// match?
        if ( *(arr+1) ) {				// more in arr? descend
          return(_children[t]->find_item(arr+1));
        } else {					// end of arr? done
          return(_children[t]);
        }
      }
    }
  }
  return(0);
}

/// Find item by descending array of \p names. Includes self in search.
/// Only Fl_Tree should need this method. Use Fl_Tree::find_item() instead.
///
/// \returns item, or 0 if not found
///
const Fl_Tree_Item *Fl_Tree_Item::find_item(char **names) const {
  if ( label() && strcmp(label(), *names) == 0 ) {	// match self?
    if ( *(names+1) == 0 ) {				// end of names,
      return(this);					// found ourself.
    }
  }
  if ( children() ) {					// check children..
    return(find_child_item(names));
  }
  return(0);
}

/// Find item by descending array of \p names. Includes self in search.
/// Only Fl_Tree should need this method.
///
/// \returns item, or 0 if not found
///
Fl_Tree_Item *Fl_Tree_Item::find_item(char **names) {
  if ( label() && strcmp(label(), *names) == 0 ) {	// match self?
    if ( *(names+1) == 0 ) {				// end of names,
      return(this);					// found ourself.
    }
  }
  if ( children() ) {					// check children..
    return(find_child_item(names));
  }
  return(0);
}

/// Find the index number for the specified 'item'
/// in the current item's list of children.
///
/// \returns the index, or -1 if not found.
///
int Fl_Tree_Item::find_child(Fl_Tree_Item *item) {
  for ( int t=0; t<children(); t++ ) {
    if ( item == child(t) ) {
      return(t);
    }
  }
  return(-1);
}

/// Add a new child to this item with the name 'new_label', with defaults from 'prefs'.
/// An internally managed copy is made of the label string.
/// Adds the item based on the value of prefs.sortorder().
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs, const char *new_label) {
  Fl_Tree_Item *item = new Fl_Tree_Item(prefs);
  item->label(new_label);
  item->_parent = this;
  switch ( prefs.sortorder() ) {
    case FL_TREE_SORT_NONE: {
      _children.add(item);
      return(item);
    }
    case FL_TREE_SORT_ASCENDING: {
      for ( int t=0; t<_children.total(); t++ ) {
        Fl_Tree_Item *c = _children[t];
        if ( c->label() && strcmp(c->label(), new_label) > 0 ) {
          _children.insert(t, item);
          return(item);
        }
      }
      _children.add(item);
      return(item);
    }
    case FL_TREE_SORT_DESCENDING: {
      for ( int t=0; t<_children.total(); t++ ) {
        Fl_Tree_Item *c = _children[t];
        if ( c->label() && strcmp(c->label(), new_label) < 0 ) {
          _children.insert(t, item);
          return(item);
        }
      }
      _children.add(item);
      return(item);
    }
  }
  return(item);
}

/// Descend into the path specified by \p arr, and add a new child there.
/// Should be used only by Fl_Tree's internals.
/// Adds the item based on the value of prefs.sortorder().
/// \returns the item added.
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs, char **arr) {
  int t = (*arr && *(arr+1)) ? find_child(*arr) : -1;
  Fl_Tree_Item *item = 0;
  if ( t == -1 ) {
    item = (Fl_Tree_Item*)add(prefs, *arr);
  } else {
    item = (Fl_Tree_Item*)child(t);
  }
  if ( *(arr+1) ) {		// descend?
    return(item->add(prefs, arr+1));
  } else {
    return(item);		// end? done
  }
}

/// Insert a new item into current item's children at a specified position.
/// \returns the new item inserted.
///
Fl_Tree_Item *Fl_Tree_Item::insert(const Fl_Tree_Prefs &prefs, const char *new_label, int pos) {
  Fl_Tree_Item *item = new Fl_Tree_Item(prefs);
  item->label(new_label);
  item->_parent = this;
  _children.insert(pos, item);
  return(item);
}

/// Insert a new item above this item.
/// \returns the new item inserted, or 0 if an error occurred.
///
Fl_Tree_Item *Fl_Tree_Item::insert_above(const Fl_Tree_Prefs &prefs, const char *new_label) {
  Fl_Tree_Item *p = _parent;
  if ( ! p ) return(0);
  // Walk our parent's children to find ourself
  for ( int t=0; t<p->children(); t++ ) {
    Fl_Tree_Item *c = p->child(t);
    if ( this == c ) {
      return(p->insert(prefs, new_label, t));
    }
  }
  return(0);
}

/// Remove child by item.
///    \returns 0 if removed, -1 if item not an immediate child.
///
int Fl_Tree_Item::remove_child(Fl_Tree_Item *item) {
  for ( int t=0; t<children(); t++ ) {
    if ( child(t) == item ) {
      item->clear_children();
      _children.remove(t);
      return(0);
    }
  }
  return(-1);
}

/// Remove immediate child (and its children) by its label 'name'.
/// \returns 0 if removed, -1 if not found.
///
int Fl_Tree_Item::remove_child(const char *name) {
  for ( int t=0; t<children(); t++ ) {
    if ( child(t)->label() ) {
      if ( strcmp(child(t)->label(), name) == 0 ) {
        _children.remove(t);
        return(0);
      }
    }
  }
  return(-1);
}

/// Swap two of our children, given two child index values.
/// Use this eg. for sorting.
///
/// This method is FAST, and does not involve lookups.
///
/// No range checking is done on either index value.
///
/// \returns
///    -    0 : OK
///    -   -1 : failed: 'a' or 'b' is not our immediate child
///
void Fl_Tree_Item::swap_children(int ax, int bx) {
  _children.swap(ax, bx);
}

/// Swap two of our children, given item pointers.
/// Use this eg. for sorting. 
///
/// This method is SLOW because it involves linear lookups.
/// For speed, use swap_children(int,int) instead.
///
/// \returns
///    -    0 : OK
///    -   -1 : failed: 'a' or 'b' is not our immediate child
///
int Fl_Tree_Item::swap_children(Fl_Tree_Item *a, Fl_Tree_Item *b) {
  int ax = -1, bx = -1;
  for ( int t=0; t<children(); t++ ) {	// find index for a and b
    if ( _children[t] == a ) { ax = t; if ( bx != -1 ) break; else continue; }
    if ( _children[t] == b ) { bx = t; if ( ax != -1 ) break; else continue; }
  }
  if ( ax == -1 || bx == -1 ) return(-1);	// not found? fail
  swap_children(ax,bx);
  return(0);
}

/// Internal: Horizontal connector line based on preference settings.
void Fl_Tree_Item::draw_horizontal_connector(int x1, int x2, int y, const Fl_Tree_Prefs &prefs) {
  fl_color(prefs.connectorcolor());
  switch ( prefs.connectorstyle() ) {
    case FL_TREE_CONNECTOR_SOLID:
      y |= 1;				// force alignment w/dot pattern
      fl_line(x1,y,x2,y);
      return;
    case FL_TREE_CONNECTOR_DOTTED: 
        {
            y |= 1;				// force alignment w/dot pattern
            for ( int xx=x1; xx<=x2; xx++ ) {
                if ( !(xx & 1) ) fl_point(xx, y);
            }
        }
      return;
    case FL_TREE_CONNECTOR_NONE:
      return;
  }
}

/// Internal: Vertical connector line based on preference settings.
void Fl_Tree_Item::draw_vertical_connector(int x, int y1, int y2, const Fl_Tree_Prefs &prefs) {
  fl_color(prefs.connectorcolor());
  switch ( prefs.connectorstyle() ) {
    case FL_TREE_CONNECTOR_SOLID:
      y1 |= 1;				// force alignment w/dot pattern
      y2 |= 1;				// force alignment w/dot pattern
      fl_line(x,y1,x,y2);
      return;
    case FL_TREE_CONNECTOR_DOTTED:
        {
            y1 |= 1;				// force alignment w/dot pattern
            y2 |= 1;				// force alignment w/dot pattern
            for ( int yy=y1; yy<=y2; yy++ ) {
                if ( yy & 1 ) fl_point(x, yy);
            }
        }
        return;
    case FL_TREE_CONNECTOR_NONE:
      return;
  }
}

/// Find the item that the last event was over.
///
///    Returns the item if it is visible, and mouse is over it.
///    Works even if widget deactivated.
///    Use event_on_collapse_icon() to determine if collapse button was pressed.
///
///    \returns const visible item under the event if found, or 0 if none.
///
const Fl_Tree_Item *Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs &prefs) const {
  if ( ! is_visible() ) return(0);
  if ( is_root() && !prefs.showroot() ) {
    // skip event check if we're root but root not being shown
  } else {
    // See if event is over us
    if ( event_inside(_xywh) ) {		// event within this item?
      return(this);				// found
    }
  }
  if ( is_open() ) {				// open? check children of this item
    for ( int t=0; t<children(); t++ ) {
      const Fl_Tree_Item *item;
      if ( ( item = _children[t]->find_clicked(prefs) ) != NULL) {	// check child and its descendents
        return(item);							// found?
      }
    }
  }
  return(0);
}

/// Non-const version of the above.
/// Find the item that the last event was over.
///
///    Returns the item if it is visible, and mouse is over it.
///    Works even if widget deactivated.
///    Use event_on_collapse_icon() to determine if collapse button was pressed.
///
///    \returns the visible item under the event if found, or 0 if none.
///
Fl_Tree_Item *Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs &prefs) {
  if ( ! is_visible() ) return(0);
  if ( is_root() && !prefs.showroot() ) {
    // skip event check if we're root but root not being shown
  } else {
    // See if event is over us
    if ( event_inside(_xywh) ) {		// event within this item?
      return(this);				// found
    }
  }
  if ( is_open() ) {				// open? check children of this item
    for ( int t=0; t<children(); t++ ) {
      Fl_Tree_Item *item;
      if ( ( item = _children[t]->find_clicked(prefs) ) != NULL ) {	// check child and its descendents
        return(item);							// found?
      }
    }
  }
  return(0);
}

static void draw_item_focus(Fl_Boxtype B, Fl_Color fg, Fl_Color bg, int X, int Y, int W, int H) {
  if (!Fl::visible_focus()) return;
  switch (B) {
    case FL_DOWN_BOX:
    case FL_DOWN_FRAME:
    case FL_THIN_DOWN_BOX:
    case FL_THIN_DOWN_FRAME:
      X ++;
      Y ++;
    default:
      break;
  }
  fl_color(fl_contrast(fg, bg));

#if defined(USE_X11) || defined(__APPLE_QUARTZ__)
  fl_line_style(FL_DOT);
  fl_rect(X + Fl::box_dx(B), Y + Fl::box_dy(B),
          W - Fl::box_dw(B) - 1, H - Fl::box_dh(B) - 1);
  fl_line_style(FL_SOLID);
#else
  // Some platforms don't implement dotted line style, so draw
  // every other pixel around the focus area...
  //
  // Also, QuickDraw (MacOS) does not support line styles specifically,
  // and the hack we use in fl_line_style() will not draw horizontal lines
  // on odd-numbered rows...
  int i, xx, yy;

  X += Fl::box_dx(B);
  Y += Fl::box_dy(B);
  W -= Fl::box_dw(B) + 2;
  H -= Fl::box_dh(B) + 2;

  for (xx = 0, i = 1; xx < W; xx ++, i ++) if (i & 1) fl_point(X + xx, Y);
  for (yy = 0; yy < H; yy ++, i ++) if (i & 1) fl_point(X + W, Y + yy);
  for (xx = W; xx > 0; xx --, i ++) if (i & 1) fl_point(X + xx, Y + H);
  for (yy = H; yy > 0; yy --, i ++) if (i & 1) fl_point(X, Y + yy);
#endif
}

/// Return the item's 'visible' height.
///   Doesn't include linespacing(); prevents affecting eg. height of widget().
///
int Fl_Tree_Item::calc_item_height(const Fl_Tree_Prefs &prefs) const {
  if ( ! is_visible() ) return(0);
  int H = 0;
  if ( _label ) {
    fl_font(_labelfont, _labelsize);	// fl_descent() needs this :/
    H = _labelsize + fl_descent() + 1;	// at least one pixel space below descender
  }
#if FLTK_ABI_VERSION >= 10301
  if ( widget() && 
       (prefs.item_draw_mode() & FL_TREE_ITEM_HEIGHT_FROM_WIDGET) &&
       H < widget()->h()) {
    H = widget()->h();
  }
#endif /*FLTK_ABI_VERSION*/
  if ( has_children() && prefs.openicon() && H<prefs.openicon()->h() )
    H = prefs.openicon()->h();
  if ( usericon() && H<usericon()->h() )
    H = usericon()->h();
  return(H);
}

/// Draw this item and its children.
void Fl_Tree_Item::draw(int X, int &Y, int W, Fl_Widget *tree,
			Fl_Tree_Item *itemfocus,
                        const Fl_Tree_Prefs &prefs, int lastchild) {
  if ( ! is_visible() ) return; 
  int tree_top = tree->y();
  int tree_bot = tree_top + tree->h();
  int H = calc_item_height(prefs);	// height of item
  int H2 = H + prefs.linespacing();	// height of item with line spacing

  // Update the xywh of this item
  _xywh[0] = X;
  _xywh[1] = Y;
  _xywh[2] = W;
  _xywh[3] = H;

  // Determine collapse icon's xywh
  //   Note: calculate collapse icon's xywh for possible mouse click detection.
  //   We don't care about items clipped off the viewport; they won't get mouse events.
  //
  int item_y_center = Y+(H/2);
  _collapse_xywh[2] = prefs.openicon()->w();
  int &icon_w = _collapse_xywh[2];
  _collapse_xywh[0] = X + (icon_w + prefs.connectorwidth())/2 - 3;
  int &icon_x = _collapse_xywh[0];
  _collapse_xywh[1] = item_y_center - (prefs.openicon()->h()/2);
  int &icon_y = _collapse_xywh[1];
  _collapse_xywh[3] = prefs.openicon()->h();

  // Horizontal connector values
  //   XXX: Must calculate these even if(clipped) because 'draw children' code (below)
  //   needs hconn_x_center value. (Otherwise, these calculations could be 'clipped')
  //
  int hconn_x  = X+icon_w/2-1;
  int hconn_x2 = hconn_x + prefs.connectorwidth();
  int hconn_x_center = X + icon_w + ((hconn_x2 - (X + icon_w)) / 2);
  int cw1 = icon_w+prefs.connectorwidth()/2, cw2 = prefs.connectorwidth();
  int conn_w = cw1>cw2 ? cw1 : cw2;

  // Background position
  int &bg_x = _label_xywh[0] = X+(icon_w/2-1+conn_w);
  int &bg_y = _label_xywh[1] = Y;
  int &bg_w = _label_xywh[2] = W-(icon_w/2-1+conn_w);
  int &bg_h = _label_xywh[3] = H;

  // Usericon position
  int uicon_x = bg_x + ( (usericon() || prefs.usericon()) ? prefs.usericonmarginleft() : 0);
  int uicon_w = usericon() ? usericon()->w() : prefs.usericon() ? prefs.usericon()->w() : 0;

  // Label position
  int label_x = uicon_x + uicon_w + (_label ? prefs.labelmarginleft() : 0);

  // Recalc widget position
  //   Do this whether clipped or not, so that when scrolled,
  //   the widgets move to appropriate 'offscreen' positions
  //   (so that they don't get mouse events, etc)
  //
  if ( widget() ) {
    int wx = label_x;
    int wy = bg_y;
    int ww = widget()->w();		// use widget's width
#if FLTK_ABI_VERSION >= 10301
    int wh = (prefs.item_draw_mode() & FL_TREE_ITEM_HEIGHT_FROM_WIDGET)
             ? widget()->h() : H;
    if ( _label && 
         (prefs.item_draw_mode() & FL_TREE_ITEM_DRAW_LABEL_AND_WIDGET) ) {
#else /*FLTK_ABI_VERSION*/
    int wh = H;				// lock widget's height to item height
    if ( _label && !widget() ) {	// back compat: don't draw label if widget() present
#endif /*FLTK_ABI_VERSION*/
      fl_font(_labelfont, _labelsize);	// fldescent() needs this
      int lw=0, lh=0;
      fl_measure(_label,lw,lh);		// get box around text (including white space)
#if FLTK_ABI_VERSION >= 10301
      // NEW
      wx += (lw + prefs.widgetmarginleft());
#else /*FLTK_ABI_VERSION*/
      // OLD
      wx += (lw + 3);
#endif /*FLTK_ABI_VERSION*/
    }
    if ( widget()->x() != wx || widget()->y() != wy ||
	 widget()->w() != ww || widget()->h() != wh ) {
      widget()->resize(wx,wy,ww,wh);		// we'll handle redraw below
    }
  }
  char clipped = ((Y+H) < tree_top) || (Y>tree_bot) ? 1 : 0;
  char drawthis = ( is_root() && prefs.showroot() == 0 ) ? 0 : 1;
  if ( !clipped ) {
    Fl_Color fg = is_selected() ? fl_contrast(_labelfgcolor, tree->selection_color())
			        : is_active() ? _labelfgcolor
				              : fl_inactive(_labelfgcolor);
    Fl_Color bg = is_selected() ? is_active() ? tree->selection_color() 
				              : fl_inactive(tree->selection_color())
			        : _labelbgcolor == 0xffffffff ? tree->color()		// transparent bg?
							      : _labelbgcolor;
    // See if we should draw this item
    //    If this item is root, and showroot() is disabled, don't draw.
    //    'clipped' is an optimization to prevent drawing anything offscreen.
    //
    if ( drawthis ) {					// draw this item at all?
      if ( tree->damage() & ~FL_DAMAGE_CHILD ) {	// non-child damage?
	// Draw connectors
	if ( prefs.connectorstyle() != FL_TREE_CONNECTOR_NONE ) {
	  // Horiz connector between center of icon and text
	  // if this is root, the connector should not dangle in thin air on the left
	  if (is_root()) draw_horizontal_connector(hconn_x_center, hconn_x2, item_y_center, prefs);
	  else           draw_horizontal_connector(hconn_x, hconn_x2, item_y_center, prefs);
	  // Small vertical line down to children
	  if ( has_children() && is_open() )
	    draw_vertical_connector(hconn_x_center, item_y_center, Y+H2, prefs);
	  // Connectors for last child
	  if ( !is_root() ) {
	    if ( lastchild ) draw_vertical_connector(hconn_x, Y, item_y_center, prefs);
	    else             draw_vertical_connector(hconn_x, Y, Y+H2, prefs);
	  }
	}
	// Draw collapse icon
	if ( has_children() && prefs.showcollapse() ) {
	  // Draw icon image
	  if ( is_open() ) {
	    prefs.closeicon()->draw(icon_x,icon_y);
	  } else {
	    prefs.openicon()->draw(icon_x,icon_y);
	  }
	}
	// Draw the item
#if FLTK_ABI_VERSION >= 10303
	if ( !widget() && prefs.item_draw_callback() ) {
	  // Draw item using user supplied custom item draw callback
	  prefs.do_item_draw_callback(this);
        }
	else
#endif
	{
	  // Background for this item
	  // Draw bg only if different from tree's bg
	  if ( bg != tree->color() || is_selected() ) {
	    if ( is_selected() ) {			// Selected? Use selectbox() style
	      fl_draw_box(prefs.selectbox(),bg_x,bg_y,bg_w,bg_h,bg);
	    } else {					// Not Selected? use plain filled rectangle
	      fl_color(bg);
	      fl_rectf(bg_x,bg_y,bg_w,bg_h);
	    }
	    if ( widget() ) widget()->damage(FL_DAMAGE_ALL);	// if there's a child widget, we just damaged it
	  }
	  // Draw user icon (if any)
	  if ( usericon() ) {
	    // Item has user icon? Use it
	    int uicon_y = item_y_center - (usericon()->h() >> 1);
	    usericon()->draw(uicon_x,uicon_y);
	  } else if ( prefs.usericon() ) {
	    // Prefs has user icon? Use it
	    int uicon_y = item_y_center - (prefs.usericon()->h() >> 1);
	    prefs.usericon()->draw(uicon_x,uicon_y);
	  }
	  // Draw label
#if FLTK_ABI_VERSION >= 10301
	  if ( _label && 
	       ( !widget() || 
		 (prefs.item_draw_mode() & FL_TREE_ITEM_DRAW_LABEL_AND_WIDGET) ) )
#else /*FLTK_ABI_VERSION*/
	  if ( _label && !widget() )	// back compat: don't draw label if widget() present
#endif /*FLTK_ABI_VERSION*/
	  {
	    fl_color(fg);
	    fl_font(_labelfont, _labelsize);
	    int label_y = Y+(H/2)+(_labelsize/2)-fl_descent()/2;
	    fl_draw(_label, label_x, label_y);
	  }
        }		// end non-custom draw
      }			// end non-child damage
      // Draw child FLTK widget?
      if ( widget() ) {
        ((Fl_Tree*)tree)->draw_child(*widget());		// let group handle drawing child
	if ( widget()->label() )
	    ((Fl_Tree*)tree)->draw_outside_label(*widget());	// label too
      }
      // Draw focus box around item's bg last
      if ( this == itemfocus &&
           Fl::visible_focus() && 
	   Fl::focus() == tree &&
	   prefs.selectmode() != FL_TREE_SELECT_NONE ) {
	draw_item_focus(FL_NO_BOX,fg,bg,bg_x+1,bg_y+1,bg_w-1,bg_h-1);
      }
    }			// end drawthis
  }			// end clipped
  if ( drawthis ) Y += H2;			// adjust Y (even if clipped)
  // Draw child items (if any)
  if ( has_children() && is_open() ) {
    int child_x = drawthis ? (hconn_x_center - (icon_w/2) + 1)	// offset children to right,
                           : X;					// unless didn't drawthis
    int child_w = W - (child_x-X);
    int child_y_start = Y;
    for ( int t=0; t<children(); t++ ) {
      int lastchild = ((t+1)==children()) ? 1 : 0;
      _children[t]->draw(child_x, Y, child_w, tree, itemfocus, prefs, lastchild);
    }
    if ( has_children() && is_open() ) {
      Y += prefs.openchild_marginbottom();		// offset below open child tree
    }
    if ( ! lastchild ) {
      // Special 'clipped' calculation. (intentional variable shadowing)
      int clipped = ((child_y_start < tree_top) && (Y < tree_top)) ||
                    ((child_y_start > tree_bot) && (Y > tree_bot));
      if (!clipped) draw_vertical_connector(hconn_x, child_y_start, Y, prefs);
    }
  }
}

/// Was the event on the 'collapse' button?
///
int Fl_Tree_Item::event_on_collapse_icon(const Fl_Tree_Prefs &prefs) const {
  if ( is_visible() && is_active() && has_children() && prefs.showcollapse() ) {
    return(event_inside(_collapse_xywh) ? 1 : 0);
  } else {
    return(0);
  }
}

/// Was event on the label()?
///
int Fl_Tree_Item::event_on_label(const Fl_Tree_Prefs &prefs) const {
  if ( is_visible() && is_active() ) {
    return(event_inside(_label_xywh) ? 1 : 0);
  } else {
    return(0);
  }
}

/// Internal: Show the FLTK widget() for this item and all children.
/// Used by open() to re-show widgets that were hidden by a previous close()
///
void Fl_Tree_Item::show_widgets() {
  if ( _widget ) _widget->show();
  if ( is_open() ) {
    for ( int t=0; t<_children.total(); t++ ) {
      _children[t]->show_widgets();
    }
  }
}

/// Internal: Hide the FLTK widget() for this item and all children.
/// Used by close() to hide widgets.
///
void Fl_Tree_Item::hide_widgets() {
  if ( _widget ) _widget->hide();
  for ( int t=0; t<_children.total(); t++ ) {
    _children[t]->hide_widgets();
  }
}

/// Open this item and all its children.
void Fl_Tree_Item::open() {
  set_flag(OPEN,1);
  // Tell children to show() their widgets
  for ( int t=0; t<_children.total(); t++ ) {
    _children[t]->show_widgets();
  }
}

/// Close this item and all its children.
void Fl_Tree_Item::close() {
  set_flag(OPEN,0);
  // Tell children to hide() their widgets
  for ( int t=0; t<_children.total(); t++ ) {
    _children[t]->hide_widgets();
  }
}

/// Returns how many levels deep this item is in the hierarchy.
///
/// For instance; root has a depth of zero, and its immediate children
/// would have a depth of 1, and so on.
///
int Fl_Tree_Item::depth() const {
  int count = 0;
  const Fl_Tree_Item *item = parent();
  while ( item ) {
    ++count;
    item = item->parent();
  }
  return(count);
}

/// Return the next item in the tree.
///
/// This method can be used to walk the tree forward.
/// For an example of how to use this method, see Fl_Tree::first().
/// 
/// \returns the next item in the tree, or 0 if there's no more items.
///
Fl_Tree_Item *Fl_Tree_Item::next() {
  Fl_Tree_Item *p, *c = this;
  if ( c->has_children() ) {
    return(c->child(0));
  }
#if FLTK_ABI_VERSION >= 10301
  // NEW
  while ( ( p = c->parent() ) != NULL ) {	// loop upwards through parents
    if ( c->_next_sibling )			// not last child?
      return(c->_next_sibling);			// return next child
    c = p;					// child becomes parent to move up generation
  }						// loop: moves up to next parent
#else /*FLTK_ABI_VERSION*/
  // OLD
  while ( ( p = c->parent() ) != NULL ) {	// loop upwards through parents
    int t = p->find_child(c);			// find our position in parent's children[] array
    if ( ++t < p->children() )			// not last child?
      return(p->child(t));			// return next child
    c = p;					// child becomes parent to move up generation
  }						// loop: moves up to next parent
#endif /*FLTK_ABI_VERSION*/
  return(0);					// hit root? done
}

/// Return the previous item in the tree.
///
/// This method can be used to walk the tree backwards.
/// For an example of how to use this method, see Fl_Tree::last().
/// 
/// \returns the previous item in the tree, or 0 if there's no item above this one (hit the root).
///
Fl_Tree_Item *Fl_Tree_Item::prev() {
#if FLTK_ABI_VERSION >= 10301
  // NEW
  if ( !parent() ) return(0);	// hit root? done
  if ( !_prev_sibling ) {	// are we first child?
    return(parent());		// return parent
  }
  // Tricky: in the following example our current position
  // in the tree is 'j', and we need to move "up one" to 'i':
  //
  //        ROOT
  //          |-- a
  //              b-- c
  //              |   d-- e
  //              |   |   f
  //              |   |
  //              |   g-- h
  //              |       i
  //              j
  //
  // We do this via b->g->i:
  //    1. Find j's prev_sibling (b)  _
  //    2. Find b's 'last child' (g)   |_ while loop
  //    3. Find g's 'last child' (i)  _|
  //
  Fl_Tree_Item *p = _prev_sibling;	// focus on our prev sibling
  while ( p->has_children() ) {		// item has children?
    p = p->child(p->children()-1);	// descend hierarchy finding deepest 'last child'
  }
  return(p);
#else /*FLTK_ABI_VERSION*/
  // OLD
  Fl_Tree_Item *p=parent();		// start with parent
  if ( ! p ) return(0);			// hit root? done
  int t = p->find_child(this);		// find our position in parent's children[] array
  if ( --t == -1 ) {	 		// are we first child?
    return(p);				// return immediate parent
  }
  p = p->child(t);			// take parent's previous child
  while ( p->has_children() ) {		// has children?
    p = p->child(p->children()-1);	// take last child
  }
  return(p);
#endif /*FLTK_ABI_VERSION*/
}

/// Return this item's next sibling.
///
/// Moves to the next item below us at the same level (sibling).
/// Use this to move down the tree without moving deeper into the tree,
/// effectively skipping over this item's children/descendents.
/// 
/// \returns item's next sibling, or 0 if none.
///
Fl_Tree_Item *Fl_Tree_Item::next_sibling() {
#if FLTK_ABI_VERSION >= 10301
  // NEW
  return(_next_sibling);
#else /*FLTK_ABI_VERSION*/
  // OLD
  if ( !parent() ) return(0);			// No parent (root)? We have no siblings
  int index = parent()->find_child(this);	// find our position in parent's child() array
  if ( index == -1 ) return(0);			// parent doesn't know us? weird
  if ( (index+1) < parent()->children() )	// is there a next child?
    return(parent()->child(index+1));		// return next child if there's one below us
  return(0);					// no siblings below us
#endif /*FLTK_ABI_VERSION*/
}

/// Return this item's previous sibling.
///
/// Moves to the previous item above us at the same level (sibling).
/// Use this to move up the tree without moving deeper into the tree.
/// 
/// \returns This item's previous sibling, or 0 if none.
///
Fl_Tree_Item *Fl_Tree_Item::prev_sibling() {
#if FLTK_ABI_VERSION >= 10301
  // NEW
  return(_prev_sibling);
#else /*FLTK_ABI_VERSION*/
  // OLD
  if ( !parent() ) return(0);				// No parent (root)? We have no siblings
  int index = parent()->find_child(this);		// find next position up in parent's child() array
  if ( index == -1 ) return(0);				// parent doesn't know us? weird
  if ( index > 0 ) return(parent()->child(index-1));	// return previous child if there's one above us
  return(0);						// no siblings above us
#endif /*FLTK_ABI_VERSION*/
}

/// Update our _prev_sibling and _next_sibling pointers to point to neighbors,
/// given \p index as being our current position in the parent's item array.
/// Call this whenever items in the array are added/removed/moved/swapped.
/// 
void Fl_Tree_Item::update_prev_next(int index) {
#if FLTK_ABI_VERSION >= 10301
  // NEW
  int pchildren = parent() ? parent()->children() : 0;
  int index_prev = index-1;
  int index_next = index+1;
  // Get pointers to prev+next items
  Fl_Tree_Item *item_prev = (index_prev>=0)&&(index_prev<pchildren) ? parent()->child(index_prev) : 0;
  Fl_Tree_Item *item_next = (index_next>=0)&&(index_next<pchildren) ? parent()->child(index_next) : 0;
  // Adjust our prev+next ptrs
  _prev_sibling = item_prev;
  _next_sibling = item_next;
  // Adjust neighbors to point to us
  if ( item_prev ) item_prev->_next_sibling = this;
  if ( item_next ) item_next->_prev_sibling = this;
#else /*FLTK_ABI_VERSION*/
  // OLD
  // -- does nothing --
#endif /*FLTK_ABI_VERSION*/
}
      
/// Return the next visible item. (If this item has children and is closed, children are skipped)
///
/// This method can be used to walk the tree forward, skipping items
/// that are not currently visible to the user.
/// 
/// \returns the next visible item below us, or 0 if there's no more items.
///
Fl_Tree_Item *Fl_Tree_Item::next_displayed(Fl_Tree_Prefs &prefs) {
  Fl_Tree_Item *item = this;
  while ( 1 ) {
    item = item->next();
    if ( !item ) return 0;
    if ( item->is_root() && !prefs.showroot() ) continue;
    if ( item->visible_r() ) return(item);
  }
}

/// Return the previous visible item. (If this item above us has children and is closed, its children are skipped)
///
/// This method can be used to walk the tree backward, 
/// skipping items that are not currently visible to the user.
/// 
/// \returns the previous visible item above us, or 0 if there's no more items.
///
Fl_Tree_Item *Fl_Tree_Item::prev_displayed(Fl_Tree_Prefs &prefs) {
  Fl_Tree_Item *c = this;
  while ( c ) {
    c = c->prev();					// previous item
    if ( !c ) break;					// no more items? done
    if ( c->is_root() )					// root
      return((prefs.showroot()&&c->visible()) ? c : 0);	// return root if visible
    if ( !c->visible() ) continue;			// item not visible? skip
    // Check all parents to be sure none are closed.
    // If closed, move up to that level and repeat until sure none are closed.
    Fl_Tree_Item *p = c->parent();
    while (1) {
      if ( !p || p->is_root() ) return(c);		// hit top? then we're displayed, return c
      if ( p->is_close() ) c = p;			// found closed parent? make it current
      p = p->parent();					// continue up tree
    }
  }
  return(0);						// hit end: no more items
}

/// Returns if item and all its parents are visible.
/// Also takes into consideration if any parent is close()ed.
/// \returns
///    1 -- item and its parents are visible/open()
///    0 -- item (or parents) invisible or close()ed.
///
int Fl_Tree_Item::visible_r() const {
  if ( !visible() ) return(0);
  for (const Fl_Tree_Item *p=parent(); p; p=p->parent())// move up through parents
    if (!p->visible() || p->is_close()) return(0);	// any parent not visible or closed?
  return(1);
}

//
// End of "$Id$".
//