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fltk/src/Fl_Tree_Item.cxx
Greg Ercolano 0291b48a73 Fix slowness due to not clipping (#1014)
2024-07-21 10:20:13 -07:00

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//
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <FL/Fl.H>
#include <FL/Fl_Widget.H>
#include <FL/Fl_Tree_Item.H>
#include <FL/Fl_Tree_Prefs.H>
#include <FL/Fl_Tree.H>
#include <FL/fl_string_functions.h>
#include "Fl_System_Driver.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:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.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 \p 'prefs'.
/// \deprecated in 1.3.3 ABI -- you must use Fl_Tree_Item(Fl_Tree*) for proper horizontal scrollbar behavior.
///
Fl_Tree_Item::Fl_Tree_Item(const Fl_Tree_Prefs &prefs) {
_Init(prefs, 0);
}
// Initialize the tree item
// Used by constructors
//
void Fl_Tree_Item::_Init(const Fl_Tree_Prefs &prefs, Fl_Tree *tree) {
_tree = tree;
_label = 0;
_labelfont = prefs.labelfont();
_labelsize = prefs.labelsize();
_labelfgcolor = prefs.labelfgcolor();
_labelbgcolor = prefs.labelbgcolor();
_widget = 0;
_flags = OPEN|VISIBLE|ACTIVE;
_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;
_userdeicon = 0;
_userdata = 0;
_parent = 0;
_children.manage_item_destroy(1); // let array's dtor manage destroying Fl_Tree_Items
_prev_sibling = 0;
_next_sibling = 0;
}
/// Constructor.
/// Makes a new instance of Fl_Tree_Item for \p 'tree'.
///
/// This must be used instead of the older, deprecated Fl_Tree_Item(Fl_Tree_Prefs)
/// constructor for proper horizontal scrollbar calculation.
///
/// \version 1.3.3 ABI feature
///
Fl_Tree_Item::Fl_Tree_Item(Fl_Tree *tree) {
_Init(tree->_prefs, tree);
}
// 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
_userdeicon = 0; // user handled allocation
// focus item? set to null
if ( _tree && this == _tree->_item_focus )
{ _tree->_item_focus = 0; }
//_children.clear(); // array's destructor handles itself
}
/// Copy constructor.
Fl_Tree_Item::Fl_Tree_Item(const Fl_Tree_Item *o) {
_tree = o->_tree;
_label = o->label() ? fl_strdup(o->label()) : 0;
_labelfont = o->labelfont();
_labelsize = o->labelsize();
_labelfgcolor = o->labelfgcolor();
_labelbgcolor = o->labelbgcolor();
_widget = o->widget();
_flags = o->_flags;
_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;
_prev_sibling = 0; // do not copy ptrs! use update_prev_next()
_next_sibling = 0; // do not copy ptrs! use update_prev_next()
}
/// Print the tree as 'ascii art' to stdout.
/// Used mainly for debugging.
///
void Fl_Tree_Item::show_self(const char *indent) const {
const char *thelabel = label() ? label() : "(NULL)";
printf("%s-%s (%d children, this=%p, parent=%p, prev=%p, next=%p, depth=%d)\n",
indent, thelabel, children(), (void*)this, (void*)_parent,
(void*)_prev_sibling, (void*)_next_sibling, depth());
if ( children() ) {
char *i2 = new char [strlen(indent)+3]; // 2 + nul byte
strcpy(i2, indent);
strcat(i2, " |");
for ( int t=0; t<children(); t++ ) {
child(t)->show_self(i2);
}
delete[] i2;
}
fflush(stdout);
}
/// Set the label to \p 'name'.
/// Makes and manages an internal copy of \p 'name'.
///
void Fl_Tree_Item::label(const char *name) {
if ( _label ) { free((void*)_label); _label = 0; }
_label = name ? fl_strdup(name) : 0;
recalc_tree(); // may change label geometry
}
/// Return the label.
const char *Fl_Tree_Item::label() const {
return(_label);
}
/// Return const 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();
recalc_tree(); // may change tree geometry
}
/// Return the index of the immediate child of this item
/// that has the label \p 'name'.
///
/// \returns index of found item, or -1 if not found.
/// \version 1.3.0 release
///
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);
}
/// Return the /immediate/ child of current item
/// that has the label \p 'name'.
///
/// \returns const found item, or 0 if not found.
/// \version 1.3.3
///
const Fl_Tree_Item* Fl_Tree_Item::find_child_item(const char *name) const {
if ( name )
for ( int t=0; t<children(); t++ )
if ( child(t)->label() )
if ( strcmp(child(t)->label(), name) == 0 )
return(child(t));
return(0);
}
/// Non-const version of Fl_Tree_Item::find_child_item(const char *name) const.
Fl_Tree_Item* Fl_Tree_Item::find_child_item(const char *name) {
// "Effective C++, 3rd Ed", p.23. Sola fide, Amen.
return(const_cast<Fl_Tree_Item*>(
static_cast<const Fl_Tree_Item &>(*this).find_child_item(name)));
}
/// Find child item by descending array \p 'arr' of names.
/// Does not include self in search.
/// Only Fl_Tree should need this method.
///
/// \returns item, or 0 if not found
/// \version 1.3.0 release
///
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_child_item(arr+1));
} else { // end of arr? done
return(_children[t]);
}
}
}
}
return(0);
}
/// Non-const version of Fl_Tree_Item::find_child_item(char **arr) const.
Fl_Tree_Item *Fl_Tree_Item::find_child_item(char **arr) {
// "Effective C++, 3rd Ed", p.23. Sola fide, Amen.
return(const_cast<Fl_Tree_Item*>(
static_cast<const Fl_Tree_Item &>(*this).find_child_item(arr)));
}
/// 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 const item, or 0 if not found
///
const Fl_Tree_Item *Fl_Tree_Item::find_item(char **names) const {
if ( ! *names ) return(0);
if ( label() && strcmp(label(), *names) == 0 ) { // match self?
++names; // skip self
if ( *names == 0 ) return(this); // end of names, found ourself
}
if ( children() ) { // check children..
return(find_child_item(names));
}
return(0);
}
/// Non-const version of Fl_Tree_Item::find_item(char **names) const.
Fl_Tree_Item *Fl_Tree_Item::find_item(char **names) {
// "Effective C++, 3rd Ed", p.23. Sola fide, Amen.
return(const_cast<Fl_Tree_Item*>(
static_cast<const Fl_Tree_Item &>(*this).find_item(names)));
}
/// Find the index number for the specified \p '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 \p 'new_label'
/// and defaults from \p 'prefs'.
/// An internally managed copy is made of the label string.
/// Adds the item based on the value of prefs.sortorder().
/// \returns the item added
/// \version 1.3.0 release
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs,
const char *new_label) {
return(add(prefs, new_label, (Fl_Tree_Item*)0));
}
/// Add \p 'item' as immediate child with \p 'new_label'
/// and defaults from \p 'prefs'.
/// If \p 'item' is NULL, a new item is created.
/// An internally managed copy is made of the label string.
/// Adds the item based on the value of prefs.sortorder().
/// \returns the item added
/// \version 1.3.3
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs,
const char *new_label,
Fl_Tree_Item *item) {
if ( !item )
{ item = new Fl_Tree_Item(_tree); item->label(new_label); }
recalc_tree(); // may change tree geometry
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.
/// \version 1.3.0 release
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs, char **arr) {
return add(prefs, arr, 0);
}
/// Descend into path specified by \p 'arr' and add \p 'newitem' there.
/// Should be used only by Fl_Tree's internals.
/// If item is NULL, a new item is created.
/// Adds the item based on the value of prefs.sortorder().
/// \returns the item added.
/// \version 1.3.3 ABI feature
///
Fl_Tree_Item *Fl_Tree_Item::add(const Fl_Tree_Prefs &prefs,
char **arr,
Fl_Tree_Item *newitem) {
if ( !*arr ) return 0;
// See if we can find an existing child with name requested.
Fl_Tree_Item *child = find_child_item(*arr);
if ( child ) { // Child found?
if ( *(arr+1) == 0 ) { // ..and at end of path?
if ( !newitem ) { // ..and no item specified?
return 0; // ..error: child exists already
} else {
// Child found, end of path, item specified
return child->add(prefs, newitem->label(), newitem);
}
}
// Child found: more path elements to go or item specified?
// Descend into child to handle add..
return child->add(prefs, arr+1, newitem); // recurse
}
// No child found, see if we reached end of path.
// If so, add as an immediate child, done
if ( *(arr+1) == 0 ) // end of path?
return add(prefs, *arr, newitem); // add as immediate child
// No child found, but more to path?
// If so, create new child to handle add()
Fl_Tree_Item *newchild;
return (newchild=add(prefs, *arr)) // create new immediate child
? newchild->add(prefs,arr+1,newitem) // it worked? recurse to add
: 0; // failed? error
}
/**
Insert a new item named \p 'new_label' into current item's
children at a specified position \p 'pos'.
If \p pos is out of range the new item is
- prepended if \p pos \< 0 or
- appended if \p pos \> item->children().
\returns the new item inserted
\see Fl_Tree::insert()
*/
Fl_Tree_Item *Fl_Tree_Item::insert(const Fl_Tree_Prefs &prefs, const char *new_label, int pos) {
(void) prefs; // quiet warnings unused params
Fl_Tree_Item *item = new Fl_Tree_Item(_tree);
item->label(new_label);
item->_parent = this;
_children.insert(pos, item);
recalc_tree(); // may change tree geometry
return(item);
}
/// Insert a new item named \p 'new_label' 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);
}
/// Deparent child at index position \p 'pos'.
/// This creates an "orphaned" item that is still allocated,
/// but has no parent or siblings. Normally the caller would
/// want to immediately reparent the orphan elsewhere.
///
/// A successfully orphaned item will have its parent()
/// and prev_sibling()/next_sibling() set to NULL.
///
/// \returns
/// - pointer to orphaned item on success
/// - NULL on error (could not deparent the item)
/// \see reparent()
///
Fl_Tree_Item* Fl_Tree_Item::deparent(int pos) {
Fl_Tree_Item *orphan = _children[pos];
if ( _children.deparent(pos) < 0 ) return NULL;
return orphan;
}
/// Reparent specified item as a child of ourself at position \p 'pos'.
/// Typically \p 'newchild' was recently orphaned with deparent().
///
/// \returns
/// - 0: on success
/// - -1: on error (e.g. if \p 'pos' out of range) with no changes made.
/// \see deparent()
///
int Fl_Tree_Item::reparent(Fl_Tree_Item *newchild, int pos) {
int ret;
if ( (ret = _children.reparent(newchild, this, pos)) < 0 ) return ret;
newchild->parent(this); // take custody
return 0;
}
/// Move an item within its parent using index numbers.
/// Item is moved \p 'to' its new position \p 'from' its old position.
///
/// \returns
/// - 0: Success
/// - -1: range error (e.g. if \p 'to' or \p 'from' out of range).
/// - (Other return values reserved for future use)
/// \see move_above(), move_below(), move_into(), move(Fl_Tree_Item*,int,int)
///
int Fl_Tree_Item::move(int to, int from) {
return _children.move(to, from);
}
/// Move the current item above/below/into the specified \p 'item',
/// where \p 'op' determines the type of move:
///
/// - 0: move above \p 'item' (\p 'pos' ignored)
/// - 1: move below \p 'item' (\p 'pos' ignored)
/// - 2: move into \p 'item' as a child (at optional position \p 'pos')
///
/// ..and \p 'pos' determines an optional index position after the move.
///
/// \returns 0 on success. a negative number on error:
/// - -1: one of the items has no parent
/// - -2: item's index could not be determined
/// - -3: bad 'op'
/// - -4: index range error
/// - -5: could not deparent
/// - -6: could not reparent at \p 'pos'
/// - (Other return values reserved for future use.)
///
/// \see move_above(), move_below(), move_into(), move(int,int)
///
int Fl_Tree_Item::move(Fl_Tree_Item *item, int op, int pos) {
Fl_Tree_Item *from_parent, *to_parent;
int from, to;
switch (op) {
case 0: // "above"
from_parent = this->parent();
to_parent = item->parent();
if ( !from_parent || !to_parent ) return -1;
from = from_parent->find_child(this);
to = to_parent->find_child(item);
break;
case 1: // "below"
from_parent = this->parent();
to_parent = item->parent();
if ( !from_parent || !to_parent ) return -1;
from = from_parent->find_child(this);
to = to_parent->find_child(item);
break;
case 2: // "into"
from_parent = this->parent();
if ( !from_parent ) return -1;
to_parent = item;
from = from_parent->find_child(this);
to = pos;
break;
default:
return -3;
}
if ( !from_parent || !to_parent ) return -1;
if ( from < 0 || to < 0 ) return -2;
if ( from_parent == to_parent ) { // same parent?
switch (op) { // 'to' offsets due to scroll
case 0: if ( from < to && to > 0 ) --to; break;
case 1: if ( from > to && to < to_parent->children() ) ++to; break;
}
if ( from_parent->move(to, from) < 0 ) // simple move among siblings
return -4;
} else { // different parent?
if ( to > to_parent->children() ) // try to prevent a reparent() error
return -4;
if ( from_parent->deparent(from) == NULL ) // deparent self from current parent
return -5;
if ( to_parent->reparent(this, to) < 0 ) { // reparent self to new parent at position 'to'
to_parent->reparent(this, 0); // failed? shouldn't happen, reparent at 0
return -6;
}
}
return 0;
}
/// Move the current item above the specified \p 'item'.
/// This is the equivalent of calling move(item,0,0).
///
/// \returns 0 on success.<br>
/// On error returns a negative value;
/// see move(Fl_Tree_Item*,int,int) for possible error codes.
///
/// \see move_below(), move_into(), move(int,int), move(Fl_Tree_Item*,int,int)
///
int Fl_Tree_Item::move_above(Fl_Tree_Item *item) {
return move(item, 0, 0);
}
/// Move the current item below the specified \p 'item'.
/// This is the equivalent of calling move(item,1,0).
///
/// \returns 0 on success.<br>
/// On error returns a negative value;
/// see move(Fl_Tree_Item*,int,int) for possible error codes.
///
/// \see move_above(), move_into(), move(int,int), move(Fl_Tree_Item*,int,int)
///
int Fl_Tree_Item::move_below(Fl_Tree_Item *item) {
return move(item, 1, 0);
}
/// Parent the current item as a child of the specified \p 'item'.
/// This is the equivalent of calling move(item,2,pos).
///
/// \returns 0 on success.<br>
/// On error returns a negative value;
/// see move(Fl_Tree_Item*,int,int) for possible error codes.
///
/// \see move_above(), move_below(), move(int,int), move(Fl_Tree_Item*,int,int)
///
int Fl_Tree_Item::move_into(Fl_Tree_Item *item, int pos) {
return move(item, 2, pos);
}
/// Return the parent tree's prefs.
/// \returns a reference to the parent tree's Fl_Tree_Prefs
/// \version 1.3.3 ABI feature
///
const Fl_Tree_Prefs& Fl_Tree_Item::prefs() const {
return(_tree->_prefs);
}
/// Replace the current item with a new item.
///
/// The current item is destroyed if successful.
/// No checks are made to see if an item with the same name exists.
///
/// This method can be used to, for example, install 'custom' items
/// into the tree derived from Fl_Tree_Item; see draw_item_content().
///
/// \param[in] newitem The new item to replace the current item
/// \returns newitem on success, NULL if could not be replaced.
/// \see Fl_Tree_Item::draw_item_content(), Fl_Tree::root(Fl_Tree_Item*)
/// \version 1.3.3 ABI feature
///
Fl_Tree_Item *Fl_Tree_Item::replace(Fl_Tree_Item *newitem) {
Fl_Tree_Item *p = parent();
if ( !p ) { // no parent? then we're the tree's root..
_tree->root(newitem); // ..tell tree to replace root
return newitem;
}
// has parent? ask parent to replace us
return p->replace_child(this, newitem);
}
/// Replace existing child \p 'olditem' with \p 'newitem'.
///
/// The \p 'olditem' is destroyed if successful.
/// Can be used to put custom items (derived from Fl_Tree_Item) into the tree.
/// No checks are made to see if an item with the same name exists.
///
/// \param[in] olditem The item to be found and replaced
/// \param[in] newitem The new item to take the place of \p 'olditem'
/// \returns newitem on success and \p 'olditem' is destroyed.
/// NULL on error if \p 'olditem' was not found
/// as an immediate child.
/// \see replace(), Fl_Tree_Item::draw()
/// \version 1.3.3 ABI feature
///
Fl_Tree_Item *Fl_Tree_Item::replace_child(Fl_Tree_Item *olditem,
Fl_Tree_Item *newitem) {
int pos = find_child(olditem); // find our index for olditem
if ( pos == -1 ) return(NULL);
newitem->_parent = this;
// replace in array (handles stitching neighboring items)
_children.replace(pos, newitem);
recalc_tree(); // newitem may have changed tree geometry
return newitem;
}
/// Remove \p 'item' from the current item's children.
/// \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);
recalc_tree(); // may change tree geometry
return(0);
}
}
return(-1);
}
/// Remove immediate child (and its children) by its label \p 'name'.
/// If more than one item matches \p 'name', only the first
/// matching item is removed.
/// \param[in] name The label name of the immediate child to remove
/// \returns 0 if removed, -1 if not found.
/// \version 1.3.3
///
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);
recalc_tree(); // may change tree geometry
return(0);
}
}
}
return(-1);
}
/// Swap two of our children, given two child index values \p 'ax' and \p 'bx'.
/// Use e.g. for sorting.<br>
/// This method is FAST, and does not involve lookups.<br>
/// No range checking is done on either index value.
/// \param[in] ax,bx the index of the items to swap
///
void Fl_Tree_Item::swap_children(int ax, int bx) {
_children.swap(ax, bx);
}
/// Swap two of our immediate children, given item pointers.
/// Use e.g. for sorting.
///
/// This method is SLOW because it involves linear lookups.<br>
/// For speed, use swap_children(int,int) instead.
///
/// \param[in] a,b The item ptrs of the two items to swap.
/// Both must be immediate children of the current item.
/// \returns
/// - 0 : OK
/// - -1 : failed: item \p 'a' or \p 'b' is not our 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.
/// \param[in] x1 The left hand X position of the horizontal connector
/// \param[in] x2 The right hand X position of the horizontal connector
/// \param[in] y The vertical position of the horizontal connector
/// \param[in] prefs The Fl_Tree prefs
///
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:
fl_line(x1,y,x2,y);
return;
case FL_TREE_CONNECTOR_DOTTED:
{
x1 |= 1; // force alignment w/dot pattern
for ( int xx=x1; xx<=x2; xx+=2 ) {
fl_point(xx, y);
}
return;
}
case FL_TREE_CONNECTOR_NONE:
return;
}
}
/// Internal: Vertical connector line based on preference settings.
/// \param[in] x The x position of the vertical connector
/// \param[in] y1 The top of the vertical connector
/// \param[in] y2 The bottom of the vertical connector
/// \param[in] prefs The Fl_Tree prefs
///
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+=2 ) {
fl_point(x, yy);
}
return;
}
case FL_TREE_CONNECTOR_NONE:
return;
}
}
/// Find the item that the last event was over.
/// If \p 'yonly' is 1, only check event's y value, don't care about x.
/// \param[in] prefs The parent tree's Fl_Tree_Prefs
/// \param[in] yonly -- 0: check both event's X and Y values.
/// -- 1: only check event's Y value, don't care about X.
/// \returns pointer to clicked item, or NULL if none found
/// \version 1.3.3 ABI feature
///
const Fl_Tree_Item *Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs &prefs, int yonly) 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 ( yonly ) {
if ( Fl::event_y() >= _xywh[1] &&
Fl::event_y() <= (_xywh[1]+_xywh[3]) ) {
return(this);
}
} else {
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, yonly)) != NULL) // recurse into child for descendents
return(item); // found?
}
}
return(0);
}
/// Non-const version of Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs&,int) const
Fl_Tree_Item *Fl_Tree_Item::find_clicked(const Fl_Tree_Prefs &prefs, int yonly) {
// "Effective C++, 3rd Ed", p.23. Sola fide, Amen.
return(const_cast<Fl_Tree_Item*>(
static_cast<const Fl_Tree_Item &>(*this).find_clicked(prefs, yonly)));
}
/// Return the item's 'visible' height. Takes into account the item's:
/// - visibility (if !is_visible(), returns 0)
/// - labelfont() height: if label() != NULL
/// - widget() height: if widget() != NULL
/// - openicon() height (if has children)
/// - usericon() height (if not NULL)
/// Does NOT include Fl_Tree::linespacing();
/// \returns maximum pixel height
///
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 ( widget() &&
(prefs.item_draw_mode() & FL_TREE_ITEM_HEIGHT_FROM_WIDGET) &&
H < widget()->h()) {
H = widget()->h();
}
if ( has_children() && H < prefs.openicon_h() )
H = prefs.openicon_h();
if ( usericon() && H<usericon()->h() )
H = usericon()->h();
return(H);
}
// These methods held for 1.3.3 ABI: all need 'tree()' back-reference.
/// Returns the recommended foreground color used for drawing this item.
/// \see draw_item_content()
/// \version 1.3.3 ABI ABI
///
Fl_Color Fl_Tree_Item::drawfgcolor() const {
return is_selected() ? fl_contrast(_labelfgcolor, tree()->selection_color())
: (is_active() && tree()->active_r()) ? _labelfgcolor
: fl_inactive(_labelfgcolor);
}
/// Returns the recommended background color used for drawing this item.
/// \see draw_item_content()
/// \version 1.3.3 ABI
///
Fl_Color Fl_Tree_Item::drawbgcolor() const {
const Fl_Color unspecified = 0xffffffff;
return is_selected() ? is_active() && tree()->active_r() ? tree()->selection_color()
: fl_inactive(tree()->selection_color())
: _labelbgcolor == unspecified ? tree()->color()
: _labelbgcolor;
}
/// Draw the item content
///
/// This method can be overridden to implement custom drawing
/// by filling the label_[xywh]() area with content.
///
/// A minimal example of how to override draw_item_content()
/// and draw just a normal item's background and label ourselves:
///
/// \code
/// class MyTreeItem : public Fl_Tree_Item {
/// public:
/// MyTreeItem() { }
/// ~MyTreeItem() { }
/// // DRAW OUR CUSTOM CONTENT FOR THE ITEM
/// int draw_item_content(int render) {
/// // Our item's dimensions + text content
/// int X=label_x(), Y=label_y(), W=label_w(), H=label_h();
/// const char *text = label() ? label() : "";
/// // Rendering? Do any drawing that's needed
/// if ( render ) {
/// // Draw bg -- a filled rectangle
/// fl_color(drawbgcolor()); fl_rectf(X,Y,W,H);
/// // Draw label
/// fl_font(labelfont(), labelsize()); // use item's label font/size
/// fl_color(drawfgcolor()); // use recommended fg color
/// fl_draw(text, X,Y,W,H, FL_ALIGN_LEFT); // draw the item's label
/// }
/// // Rendered or not, we must calculate content's max X position
/// int lw=0, lh=0;
/// fl_measure(text, lw, lh); // get width of label text
/// return X + lw; // return X + label width
/// }
/// };
/// \endcode
///
/// You can draw anything you want inside draw_item_content()
/// using any of the fl_draw.H functions, as long as it's
/// within the label's xywh area.
///
/// To add instances of your custom item to the tree, you can use:
///
/// \code
/// // Example #1: using add()
/// MyTreeItem *bart = new MyTreeItem(..); // class derived from Fl_Tree_Item
/// tree->add("/Simpsons/Bart", bart); // Add item as /Simpsons/Bart
/// \endcode
///
/// ..or you can insert or replace existing items:
///
/// \code
/// // Example #2: using replace()
/// MyTreeItem *marge = new MyTreeItem(..); // class derived from Fl_Tree_Item
/// item = tree->add("/Simpsons/Marge"); // create item
/// item->replace(mi); // replace it with our own
/// \endcode
///
/// \param[in] render Whether we should render content (1), or just tally
/// the geometry (0). Fl_Tree may want only to find the widest
/// item in the tree for scrollbar calculations.
///
/// \returns the right-most X coordinate, or 'xmax' of content we drew,
/// i.e. the "scrollable" content.
/// The tree uses the largest xmax to determine the maximum
/// width of the tree's content (needed for e.g. computing the
/// horizontal scrollbar's size).
/// \version 1.3.3 ABI feature
///
int Fl_Tree_Item::draw_item_content(int render) {
Fl_Color fg = drawfgcolor();
Fl_Color bg = drawbgcolor();
const Fl_Tree_Prefs &prefs = tree()->prefs();
int xmax = label_x();
// Background for this item, only if different from tree's bg
if ( render && (bg != tree()->color() || is_selected()) ) {
if ( is_selected() ) { // Selected? Use selectbox() style
fl_draw_box(prefs.selectbox(),
label_x(), label_y(), label_w(), label_h(), bg);
} else { // Not Selected? use plain filled rectangle
fl_color(bg);
fl_rectf(label_x(), label_y(), label_w(), label_h());
}
if ( widget() ) widget()->damage(FL_DAMAGE_ALL); // if there's a child widget, we just damaged it
}
// Draw label
if ( _label &&
( !widget() ||
(prefs.item_draw_mode() & FL_TREE_ITEM_DRAW_LABEL_AND_WIDGET) ) ) {
if ( render ) {
fl_color(fg);
fl_font(_labelfont, _labelsize);
}
int lx = label_x()+(_label ? prefs.labelmarginleft() : 0);
int ly = label_y()+(label_h()/2)+(_labelsize/2)-fl_descent()/2;
int lw=0, lh=0;
fl_measure(_label, lw, lh); // get box around text (including white space)
if ( render ) fl_draw(_label, lx, ly);
xmax = lx + lw; // update max width of drawn item
}
return xmax;
}
/// Draw this item and its children.
///
/// \param[in] X Horizontal position for item being drawn
/// \param[in,out] Y Vertical position for item being drawn,
/// returns new position for next item
/// \param[in] W Recommended width for item
/// \param[in] itemfocus The tree's current focus item (if any)
/// \param[in,out] tree_item_xmax The tree's running xmax (right-most edge so far).
/// Mainly used by parent tree when render==0 to
/// calculate tree's max width.
/// \param[in] lastchild Is this item the last child in a subtree?
/// \param[in] render Whether or not to render the item:
/// 0: no rendering, just calculate size w/out drawing.
/// 1: render item as well as size calc
///
/// \version 1.3.3 ABI feature: modified parameters
///
void Fl_Tree_Item::draw(int X, int &Y, int W, Fl_Tree_Item *itemfocus,
int &tree_item_xmax, int lastchild, int render) {
Fl_Tree_Prefs &prefs = _tree->_prefs;
if ( !is_visible() ) return;
int tree_top = tree()->_tiy;
int tree_bot = tree_top + tree()->_tih;
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))|1; // |1: force alignment w/dot pattern
_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
// 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;
// Usericon position
int uicon_x = X+(icon_w/2-1+conn_w) + ( (usericon() || prefs.usericon())
? prefs.usericonmarginleft() : 0);
int uicon_w = usericon() ? usericon()->w()
: prefs.usericon() ? prefs.usericon()->w() : 0;
// Label xywh
_label_xywh[0] = uicon_x + uicon_w + prefs.labelmarginleft();
_label_xywh[1] = Y;
_label_xywh[2] = tree()->_tix + tree()->_tiw - _label_xywh[0];
_label_xywh[3] = H;
// Begin calc of this item's max width..
// It might not even be visible, so start at zero.
//
int xmax = 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 = uicon_x + uicon_w + (_label ? prefs.labelmarginleft() : 0);
int wy = label_y();
int ww = widget()->w(); // use widget's width
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) ) {
fl_font(_labelfont, _labelsize); // fldescent() needs this
int lw=0, lh=0;
fl_measure(_label,lw,lh); // get box around text (including white space)
wx += (lw + prefs.widgetmarginleft());
}
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;
if (!render) clipped = 0; // NOT rendering? Then don't clip, so we calc unclipped items
char active = (is_active() && tree()->active_r()) ? 1 : 0;
char drawthis = ( is_root() && prefs.showroot() == 0 ) ? 0 : 1;
if ( !clipped ) {
Fl_Color fg = drawfgcolor();
Fl_Color bg = drawbgcolor();
// 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) || !render ) { // non-child damage?
// Draw connectors
if ( render && prefs.connectorstyle() != FL_TREE_CONNECTOR_NONE ) {
// Horiz connector to center of icon
draw_horizontal_connector(hconn_x, hconn_x_center, 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 ( render && has_children() && prefs.showcollapse() ) {
// Draw icon image
if ( is_open() ) {
if ( prefs.closeicon() ) {
if ( active ) prefs.closeicon()->draw(icon_x, icon_y);
else prefs.closedeicon()->draw(icon_x, icon_y);
} else {
Fl::system_driver()->tree_draw_expando_button(icon_x, icon_y, false, active);
}
} else {
if ( prefs.openicon() ) {
if ( active ) prefs.openicon()->draw(icon_x, icon_y);
else prefs.opendeicon()->draw(icon_x, icon_y);
} else {
Fl::system_driver()->tree_draw_expando_button(icon_x, icon_y, true, active);
}
}
}
// Draw user icon (if any)
if ( render && usericon() ) {
// Item has user icon? Use it
int uicon_y = item_y_center - (usericon()->h() >> 1);
if ( active ) usericon()->draw(uicon_x,uicon_y);
else if ( userdeicon() ) userdeicon()->draw(uicon_x,uicon_y);
} else if ( render && prefs.usericon() ) {
// Prefs has user icon? Use it
int uicon_y = item_y_center - (prefs.usericon()->h() >> 1);
if ( active ) prefs.usericon()->draw(uicon_x,uicon_y);
else if ( prefs.userdeicon() ) prefs.userdeicon()->draw(uicon_x,uicon_y);
}
// Draw item's content
xmax = draw_item_content(render);
} // end non-child damage
// Draw child FLTK widget?
if ( widget() ) {
if (render)
tree()->draw_child(*widget()); // let group handle drawing child
if ( widget()->label() && render )
tree()->draw_outside_label(*widget());// label too
xmax = widget()->x() + widget()->w(); // update max width of widget
}
// Draw focus box around item's bg last
if ( render &&
this == itemfocus &&
Fl::visible_focus() &&
Fl::focus() == tree() &&
prefs.selectmode() != FL_TREE_SELECT_NONE ) {
fl_draw_box_focus(FL_NO_BOX, label_x()+1, label_y()+1, label_w()-1, label_h()-1, fg, bg);
}
} // end drawthis
} // end clipped
if ( drawthis ) Y += H2; // adjust Y (even if clipped)
// Manage tree_item_xmax
if ( xmax > tree_item_xmax )
tree_item_xmax = xmax;
// 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 is_lastchild = ((t+1)==children()) ? 1 : 0;
_children[t]->draw(child_x, Y, child_w, itemfocus, tree_item_xmax, is_lastchild, render);
}
if ( has_children() && is_open() ) {
Y += prefs.openchild_marginbottom(); // offset below open child tree
}
if ( ! lastchild ) {
// Draw vertical connector between this item and the bottom of its children.
//
// o Aaa <- Item we're drawing has >20k children.
// ytop → : :.. 0001
// : :.. 0002
// : : } ~20k items
// : :.. 19998
// ┌──:──:.. 19999 ──┐
// │ : :.. 20000 │
// │ : :.. 20001 │ <- visible screen
// │ : :.. 20002 │ area
// └──:──:.. 20003 ──┘
// : :.. 20004
// :
// ybot → : ← we're drawing this long vertical connector
// :
// o Bbb
//
int ytop = child_y_start;
int ybot = Y;
int is_clipped = ((ytop < tree_top) && (ybot < tree_top)) || // completely off top of scrn? clip
((ytop > tree_bot) && (ybot > tree_bot)); // completely off bot of scrn? clip
if (render && !is_clipped ) {
// Clip vert line to within screen area
ytop = (ytop < tree_top) ? tree_top : ytop;
ybot = (ybot > tree_bot) ? tree_bot : ybot;
draw_vertical_connector(hconn_x, ytop, ybot, prefs);
}
}
}
}
/// Was the event on the 'collapse' button of this item?
///
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 the event on the 'user icon' of this item, if any?
///
int Fl_Tree_Item::event_on_user_icon(const Fl_Tree_Prefs &prefs) const {
// NOTE: Fl_Tree_Item doesn't keep an _xywh[] for usericon, but we can derive it as
// by elimitation of all other possibilities.
if ( !is_visible() ) return 0; // item not visible? not us
if ( !event_inside(_xywh) ) return 0; // not inside item? not us
if ( event_on_collapse_icon(prefs) ) return 0; // inside collapse icon? not us
if ( Fl::event_x() >= _label_xywh[0] ) return 0; // inside label or beyond (e.g. widget())? not us
// Is a user icon being shown?
// TBD: Determining usericon xywh and 'if displayed' should be class methods used here and by draw_*()
Fl_Image *ui = 0;
if ( is_active() ) {
if ( usericon() ) ui = usericon(); // user icon for item?
else if ( prefs.usericon() ) ui = prefs.usericon(); // user icon for tree?
} else {
if ( userdeicon() ) ui = userdeicon(); // user deicon for this item?
else if ( prefs.userdeicon() ) ui = prefs.userdeicon(); // user deicon for tree?
}
if ( !ui ) return 0; // no user icon? not us
int uix = _label_xywh[0]-ui->w(); // find x position of usericon
if ( Fl::event_x() < uix ) return 0; // event left of usericon? not us
return 1; // must be inside usericon by elimination
}
/// Was event anywhere on the item?
int Fl_Tree_Item::event_on_item(const Fl_Tree_Prefs &prefs) const {
(void) prefs; // quiet warnings unused params
return(event_inside(_xywh) ? 1 : 0);
}
/// Was event on the label() of this item?
int Fl_Tree_Item::event_on_label(const Fl_Tree_Prefs &prefs) const {
(void) prefs; // quiet warnings unused params
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();
}
recalc_tree(); // may change tree geometry
}
/// 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();
}
recalc_tree(); // may change tree geometry
}
/// 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. Use e.g. for determining the
/// horizontal indent of this item during drawing.
///
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));
}
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
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 ( !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);
}
/// 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 changing depth().
/// 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() {
return(_next_sibling);
}
/// 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 changing depth().
///
/// \returns This item's previous sibling, or 0 if none.
///
Fl_Tree_Item *Fl_Tree_Item::prev_sibling() {
return(_prev_sibling);
}
/// 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/etc.
/// \param[in] index Our index# in the parent.<br>
/// Special case if index=-1: become an orphan; null out all parent/sibling associations.
///
void Fl_Tree_Item::update_prev_next(int index) {
if ( index == -1 ) { // special case: become an orphan
_parent = 0;
_prev_sibling = 0;
_next_sibling = 0;
return;
}
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;
}
/// Return the next open(), 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 open/visible to the user.
///
/// \returns the next open() visible() item below us,
/// or 0 if there's no more items.
/// \version 1.3.3
///
Fl_Tree_Item *Fl_Tree_Item::next_visible(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);
}
}
/// Same as next_visible().
/// \deprecated in 1.3.3 for confusing name, use next_visible() instead
Fl_Tree_Item *Fl_Tree_Item::next_displayed(Fl_Tree_Prefs &prefs) {
return next_visible(prefs);
}
/// Return the previous open(), 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 open/visible to the user.
///
/// \returns the previous open() visible() item above us,
/// or 0 if there's no more items.
///
Fl_Tree_Item *Fl_Tree_Item::prev_visible(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
}
/// Same as prev_visible().
/// \deprecated in 1.3.3 for confusing name, use prev_visible()
///
Fl_Tree_Item *Fl_Tree_Item::prev_displayed(Fl_Tree_Prefs &prefs) {
return prev_visible(prefs);
}
/// See if item and all its parents are open() and visible().
/// \returns
/// 1 -- item and its parents are open() and visible()
/// 0 -- item or one of its parents are either not visible() or close()ed.
///
int Fl_Tree_Item::is_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);
}
/// Call this when our geometry is changed. (Font size, label contents, etc)
/// Schedules tree to recalculate itself, as changes to us may affect tree
/// widget's scrollbar visibility and tab sizes.
/// \version 1.3.3 ABI
///
void Fl_Tree_Item::recalc_tree() {
_tree->recalc_tree();
}
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