ref: 3d94702bea267035144836a5929129fd848b4d79
dir: /DoConfig/fltk/src/Fl_Check_Browser.cxx/
//
// "$Id$"
//
// Fl_Check_Browser header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2010 by Bill Spitzak and others.
//
// 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
//
#include <stdio.h>
#include <stdlib.h>
#include "flstring.h"
#include <FL/fl_draw.H>
#include <FL/Fl_Check_Browser.H>
/* This uses a cache for faster access when you're scanning the list
either forwards or backwards. */
Fl_Check_Browser::cb_item *Fl_Check_Browser::find_item(int n) const {
int i = n;
cb_item *p = first;
if (n <= 0 || n > nitems_ || p == 0) {
return 0;
}
if (n == cached_item) {
p = cache;
n = 1;
} else if (n == cached_item + 1) {
p = cache->next;
n = 1;
} else if (n == cached_item - 1) {
p = cache->prev;
n = 1;
}
while (--n) {
p = p->next;
}
/* Cast to not const and cache it. */
((Fl_Check_Browser *)this)->cache = p;
((Fl_Check_Browser *)this)->cached_item = i;
return p;
}
int Fl_Check_Browser::lineno(cb_item *p0) const {
cb_item *p = first;
if (p == 0) {
return 0;
}
int i = 1;
while (p) {
if (p == p0) {
return i;
}
i++;
p = p->next;
}
return 0;
}
Fl_Check_Browser::Fl_Check_Browser(int X, int Y, int W, int H, const char *l)
/** The constructor makes an empty browser.*/
: Fl_Browser_(X, Y, W, H, l) {
type(FL_SELECT_BROWSER);
when(FL_WHEN_NEVER);
first = last = 0;
nitems_ = nchecked_ = 0;
cached_item = -1;
}
void *Fl_Check_Browser::item_first() const {
return first;
}
void *Fl_Check_Browser::item_next(void *l) const {
return ((cb_item *)l)->next;
}
void *Fl_Check_Browser::item_prev(void *l) const {
return ((cb_item *)l)->prev;
}
int Fl_Check_Browser::item_height(void *) const {
return textsize() + 2;
}
#define CHECK_SIZE (textsize()-2)
int Fl_Check_Browser::item_width(void *v) const {
fl_font(textfont(), textsize());
return int(fl_width(((cb_item *)v)->text)) + CHECK_SIZE + 8;
}
void Fl_Check_Browser::item_draw(void *v, int X, int Y, int, int) const {
cb_item *i = (cb_item *)v;
char *s = i->text;
int tsize = textsize();
Fl_Color col = active_r() ? textcolor() : fl_inactive(textcolor());
int cy = Y + (tsize + 1 - CHECK_SIZE) / 2;
X += 2;
fl_color(active_r() ? FL_FOREGROUND_COLOR : fl_inactive(FL_FOREGROUND_COLOR));
fl_loop(X, cy, X, cy + CHECK_SIZE,
X + CHECK_SIZE, cy + CHECK_SIZE, X + CHECK_SIZE, cy);
if (i->checked) {
int tx = X + 3;
int tw = CHECK_SIZE - 4;
int d1 = tw/3;
int d2 = tw-d1;
int ty = cy + (CHECK_SIZE+d2)/2-d1-2;
for (int n = 0; n < 3; n++, ty++) {
fl_line(tx, ty, tx+d1, ty+d1);
fl_line(tx+d1, ty+d1, tx+tw-1, ty+d1-d2+1);
}
}
fl_font(textfont(), tsize);
if (i->selected) {
col = fl_contrast(col, selection_color());
}
fl_color(col);
fl_draw(s, X + CHECK_SIZE + 8, Y + tsize - 1);
}
void Fl_Check_Browser::item_select(void *v, int state) {
cb_item *i = (cb_item *)v;
if (state) {
if (i->checked) {
i->checked = 0;
nchecked_--;
} else {
i->checked = 1;
nchecked_++;
}
}
}
int Fl_Check_Browser::item_selected(void *v) const {
cb_item *i = (cb_item *)v;
return i->selected;
}
/**
Add a new unchecked line to the end of the browser.
\see add(char *s, int b)
*/
int Fl_Check_Browser::add(char *s) {
return (add(s, 0));
}
/**
Add a new line to the end of the browser. The text is copied
using the strdup() function. It may also be NULL to make
a blank line. It can set the item checked if \p b is not 0.
*/
int Fl_Check_Browser::add(char *s, int b) {
cb_item *p = (cb_item *)malloc(sizeof(cb_item));
p->next = 0;
p->prev = 0;
p->checked = b;
p->selected = 0;
p->text = strdup(s);
if (b) {
nchecked_++;
}
if (last == 0) {
first = last = p;
} else {
last->next = p;
p->prev = last;
last = p;
}
nitems_++;
return (nitems_);
}
/**
Remove line n and make the browser one line shorter. Returns the
number of lines left in the browser.
*/
int Fl_Check_Browser::remove(int item) {
cb_item *p = find_item(item);
// line at item exists
if(p) {
// tell the Browser_ what we will do
deleting(p);
// fix checked count
if(p->checked)
--nchecked_;
// remove the node
if (p->prev)
p->prev->next = p->next;
else
first = p->next;
if (p->next)
p->next->prev = p->prev;
else
last = p->prev;
free(p->text);
free(p);
--nitems_;
cached_item = -1;
}
return (nitems_);
}
/** Remove every item from the browser.*/
void Fl_Check_Browser::clear() {
cb_item *p = first;
cb_item *next;
if (p == 0) {
return;
}
new_list();
do {
next = p->next;
free(p->text);
free(p);
p = next;
} while (p);
first = last = 0;
nitems_ = nchecked_ = 0;
cached_item = -1;
}
/** Gets the current status of item item. */
int Fl_Check_Browser::checked(int i) const {
cb_item *p = find_item(i);
if (p) return p->checked;
return 0;
}
/** Sets the check status of item item to b. */
void Fl_Check_Browser::checked(int i, int b) {
cb_item *p = find_item(i);
if (p && (p->checked ^ b)) {
p->checked = b;
if (b) {
nchecked_++;
} else {
nchecked_--;
}
redraw();
}
}
/** Returns the index of the currently selected item.*/
int Fl_Check_Browser::value() const {
return lineno((cb_item *)selection());
}
/** Return a pointer to an internal buffer holding item item's text.*/
char *Fl_Check_Browser::text(int i) const {
cb_item *p = find_item(i);
if (p) return p->text;
return 0;
}
/** Sets all the items checked.*/
void Fl_Check_Browser::check_all() {
cb_item *p;
nchecked_ = nitems_;
for (p = first; p; p = p->next) {
p->checked = 1;
}
redraw();
}
/** Sets all the items unchecked.*/
void Fl_Check_Browser::check_none() {
cb_item *p;
nchecked_ = 0;
for (p = first; p; p = p->next) {
p->checked = 0;
}
redraw();
}
int Fl_Check_Browser::handle(int event) {
if (event==FL_PUSH)
deselect();
return Fl_Browser_::handle(event);
}
//
// End of "$Id$".
//