//// "$Id: Fl_Widget.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $"//// Base widget class for the Fast Light Tool Kit (FLTK).//// Copyright 1998-1999 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 to "fltk-bugs@easysw.com".//#include <FL/Fl.H>#include <FL/Fl_Widget.H>#include <FL/Fl_Group.H>////////////////////////////////////////////////////////////////// for compatability with Forms, all widgets without callbacks are// inserted into a "queue" when they are activated, and the forms// compatability interaction functions (fl_do_events, etc) will// read one widget at a time from this queue and return it:const int QUEUE_SIZE = 20;static Fl_Widget *obj_queue[QUEUE_SIZE];static int obj_head, obj_tail;void Fl_Widget::default_callback(Fl_Widget *o, void * /*v*/) {#if 0  // This is necessary for strict forms compatability but is confusing.  // Use the parent's callback if this widget does not have one.  for (Fl_Widget *p = o->parent(); p; p = p->parent())    if (p->callback() != default_callback) {      p->do_callback(o,v);      return;    }#endif  obj_queue[obj_head++] = o;  if (obj_head >= QUEUE_SIZE) obj_head = 0;  if (obj_head == obj_tail) {    obj_tail++;    if (obj_tail >= QUEUE_SIZE) obj_tail = 0;  }}Fl_Widget *Fl::readqueue() {  if (obj_tail==obj_head) return 0;  Fl_Widget *o = obj_queue[obj_tail++];  if (obj_tail >= QUEUE_SIZE) obj_tail = 0;  return o;}    ////////////////////////////////////////////////////////////////int Fl_Widget::handle(int) {return 0;}Fl_Widget::Fl_Widget(int X, int Y, int W, int H, const char* L) {  x_ = X; y_ = Y; w_ = W; h_ = H;  label_.value	= L;  label_.type	= FL_NORMAL_LABEL;  label_.font	= FL_HELVETICA;  label_.size	= FL_NORMAL_SIZE;  label_.color	= FL_BLACK;  callback_	= default_callback;  user_data_ 	= 0;  type_		= 0;  flags_	= 0;  damage_	= 0;  box_		= FL_NO_BOX;  color_	= FL_GRAY;  color2_	= FL_GRAY;  align_	= FL_ALIGN_CENTER;  when_		= FL_WHEN_RELEASE;  parent_ = 0;  if (Fl_Group::current()) Fl_Group::current()->add(this);}void Fl_Widget::resize(int X, int Y, int W, int H) {  x_ = X; y_ = Y; w_ = W; h_ = H;}// this is useful for parent widgets to call to resize children:int Fl_Widget::damage_resize(int X, int Y, int W, int H) {  if (x() == X && y() == Y && w() == W && h() == H) return 0;  resize(X, Y, W, H);  redraw();  return 1;}int Fl_Widget::take_focus() {  if (!takesevents()) return 0;  if (!handle(FL_FOCUS)) return 0; // see if it wants it  if (contains(Fl::focus())) return 1; // it called Fl::focus for us  Fl::focus(this);  return 1;}extern void fl_throw_focus(Fl_Widget*); // in Fl_x.C// Destruction does not remove from any parent group!  And groups when// destroyed destroy all their children.  This is convienent and fast.// However, it is only legal to destroy a "root" such as an Fl_Window,// and automatic destructors may be called.Fl_Widget::~Fl_Widget() {  parent_ = 0; // kludge to prevent ~Fl_Group from destroying again  fl_throw_focus(this);}// redraw this, plus redraw opaque object if there is an outside labelstatic void redraw_label(Fl_Widget* w) {  w->redraw();  if (w->label() && (w->align()&15) && !(w->align() & FL_ALIGN_INSIDE)) {    for (Fl_Widget *p = w->parent(); p; p = p->parent())      if (p->box() || !p->parent()) {p->redraw(); break;}  }}void Fl_Widget::activate() {  if (!active()) {    clear_flag(INACTIVE);    if (active_r()) {      redraw_label(this);      handle(FL_ACTIVATE);      if (inside(Fl::focus())) Fl::focus()->take_focus();    }  }}void Fl_Widget::deactivate() {  if (active_r()) {    set_flag(INACTIVE);    redraw_label(this);    handle(FL_DEACTIVATE);    fl_throw_focus(this);  } else {    set_flag(INACTIVE);  }}int Fl_Widget::active_r() const {  for (const Fl_Widget* o = this; o; o = o->parent())    if (!o->active()) return 0;  return 1;}void Fl_Widget::show() {  if (!visible()) {    clear_flag(INVISIBLE);    if (visible_r()) {      redraw_label(this);      handle(FL_SHOW);      if (inside(Fl::focus())) Fl::focus()->take_focus();    }  }}void Fl_Widget::hide() {  if (visible_r()) {    set_flag(INVISIBLE);    for (Fl_Widget *p = parent(); p; p = p->parent())      if (p->box() || !p->parent()) {p->redraw(); break;}    handle(FL_HIDE);    fl_throw_focus(this);  } else {    set_flag(INVISIBLE);  }}int Fl_Widget::visible_r() const {  for (const Fl_Widget* o = this; o; o = o->parent())    if (!o->visible()) return 0;  return 1;}// return true if widget is inside (or equal to) this:// Returns false for null widgets.int Fl_Widget::contains(const Fl_Widget *o) const {  for (; o; o = o->parent_) if (o == this) return 1;  return 0;}//// End of "$Id: Fl_Widget.cxx,v 1.1.1.1 2003/08/07 21:18:40 jasonk Exp $".//