Fl_Check_Browser.cxx

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//
// "$Id: Fl_Check_Browser.cxx 7903 2010-11-28 21:06:39Z matt $"
//
// 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; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// 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)
: 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;
}
int Fl_Check_Browser::add(char *s) {
        return (add(s, 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_);
}

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_);
}

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;
}

int Fl_Check_Browser::checked(int i) const {
        cb_item *p = find_item(i);

        if (p) return p->checked;
        return 0;
}

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();
        }
}

int Fl_Check_Browser::value() const {
        return lineno((cb_item *)selection());
}

char *Fl_Check_Browser::text(int i) const {
        cb_item *p = find_item(i);

        if (p) return p->text;
        return 0;
}

void Fl_Check_Browser::check_all() {
        cb_item *p;

        nchecked_ = nitems_;
        for (p = first; p; p = p->next) {
                p->checked = 1;
        }
        redraw();
}

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: Fl_Check_Browser.cxx 7903 2010-11-28 21:06:39Z matt $".
//