src/Fl_Pack.cxx

   1 //
   2 // "$Id: Fl_Pack.cxx 7903 2010-11-28 21:06:39Z matt $"
   3 //
   4 // Packing widget for the Fast Light Tool Kit (FLTK).
   5 //
   6 // Copyright 1998-2010 by Bill Spitzak and others.
   7 //
   8 // This library is free software; you can redistribute it and/or
   9 // modify it under the terms of the GNU Library General Public
  10 // License as published by the Free Software Foundation; either
  11 // version 2 of the License, or (at your option) any later version.
  12 //
  13 // This library is distributed in the hope that it will be useful,
  14 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16 // Library General Public License for more details.
  17 //
  18 // You should have received a copy of the GNU Library General Public
  19 // License along with this library; if not, write to the Free Software
  20 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  21 // USA.
  22 //
  23 // Please report all bugs and problems on the following page:
  24 //
  25 //     http://www.fltk.org/str.php
  26 //
  27
  28 // Based on code by Curtis Edwards
  29 // Group that compresses all it's children together and resizes to surround
  30 // them on each redraw (only if box() is zero)
  31 // Bugs: ?
  32
  33 #include <FL/Fl.H>
  34 #include <FL/Fl_Pack.H>
  35 #include <FL/fl_draw.H>
  36
  37 /**
  38   Creates a new Fl_Pack widget using the given position, size,
  39   and label string. The default boxtype is FL_NO_BOX.
  40   <P>The destructor <I>also deletes all the children</I>. This allows a
  41   whole tree to be deleted at once, without having to keep a pointer to
  42   all the children in the user code. A kludge has been done so the
  43   Fl_Pack and all of it's children can be automatic (local)
  44   variables, but you must declare the Fl_Pack<I>first</I>, so
  45   that it is destroyed last.
  46 */
  47 Fl_Pack::Fl_Pack(int X, int Y, int W, int H,const char *l)
  48 : Fl_Group(X, Y, W, H, l) {
  49   resizable(0);
  50   spacing_ = 0;
  51   // type(VERTICAL); // already set like this
  52 }
  53
  54 void Fl_Pack::draw() {
  55   int tx = x()+Fl::box_dx(box());
  56   int ty = y()+Fl::box_dy(box());
  57   int tw = w()-Fl::box_dw(box());
  58   int th = h()-Fl::box_dh(box());
  59   int rw, rh;
  60   int current_position = horizontal() ? tx : ty;
  61   int maximum_position = current_position;
  62   fl_damage_t d = damage();
  63   Fl_Widget*const* a = array();
  64   if (horizontal()) {
  65     rw = -spacing_;
  66     rh = th;
  67
  68     for (int i = children(); i--;)
  69       if (child(i)->visible()) {
  70         if (child(i) != this->resizable()) rw += child(i)->w();
  71         rw += spacing_;
  72       }
  73   } else {
  74     rw = tw;
  75     rh = -spacing_;
  76
  77     for (int i = children(); i--;)
  78       if (child(i)->visible()) {
  79         if (child(i) != this->resizable()) rh += child(i)->h();
  80         rh += spacing_;
  81       }
  82   }
  83   for (int i = children(); i--;) {
  84     Fl_Widget* o = *a++;
  85     if (o->visible()) {
  86       int X,Y,W,H;
  87       if (horizontal()) {
  88         X = current_position;
  89         W = o->w();
  90         Y = ty;
  91         H = th;
  92       } else {
  93         X = tx;
  94         W = tw;
  95         Y = current_position;
  96         H = o->h();
  97       }
  98       // Last child, if resizable, takes all remaining room
  99       if(i == 0 && o == this->resizable()) {
 100         if(horizontal())
 101           W = tw - rw;
 102         else
 103           H = th - rh;
 104       }
 105       if (spacing_ && current_position>maximum_position && box() &&
 106         (X != o->x() || Y != o->y() || d&FL_DAMAGE_ALL)) {
 107         fl_color(color());
 108         if (horizontal())
 109           fl_rectf(maximum_position, ty, spacing_, th);
 110         else
 111           fl_rectf(tx, maximum_position, tw, spacing_);
 112       }
 113       if (X != o->x() || Y != o->y() || W != o->w() || H != o->h()) {
 114         o->resize(X,Y,W,H);
 115         o->clear_damage(FL_DAMAGE_ALL);
 116       }
 117       if (d&FL_DAMAGE_ALL) {
 118         draw_child(*o);
 119         draw_outside_label(*o);
 120       } else update_child(*o);
 121       // child's draw() can change it's size, so use new size:
 122       current_position += (horizontal() ? o->w() : o->h());
 123       if (current_position > maximum_position)
 124         maximum_position = current_position;
 125       current_position += spacing_;
 126     }
 127   }
 128
 129   if (horizontal()) {
 130     if (maximum_position < tx+tw && box()) {
 131       fl_color(color());
 132       fl_rectf(maximum_position, ty, tx+tw-maximum_position, th);
 133     }
 134     tw = maximum_position-tx;
 135   } else {
 136     if (maximum_position < ty+th && box()) {
 137       fl_color(color());
 138       fl_rectf(tx, maximum_position, tw, ty+th-maximum_position);
 139     }
 140     th = maximum_position-ty;
 141   }
 142
 143   tw += Fl::box_dw(box()); if (tw <= 0) tw = 1;
 144   th += Fl::box_dh(box()); if (th <= 0) th = 1;
 145   if (tw != w() || th != h()) {
 146     Fl_Widget::resize(x(),y(),tw,th);
 147     d = FL_DAMAGE_ALL;
 148   }
 149   if (d&FL_DAMAGE_ALL) {
 150     draw_box();
 151     draw_label();
 152   }
 153 }
 154
 155 //
 156 // End of "$Id: Fl_Pack.cxx 7903 2010-11-28 21:06:39Z matt $".
 157 //