Fl_Widget.H

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//
// Widget header file for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2020 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:
//
//     https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
//     https://www.fltk.org/bugs.php
//

#ifndef Fl_Widget_H
#define Fl_Widget_H

#include "Enumerations.H"
#include "Fl.H"

class Fl_Widget;
class Fl_Window;
class Fl_Group;
class Fl_Image;

typedef void (Fl_Callback )(Fl_Widget*, void*);
typedef Fl_Callback* Fl_Callback_p; // needed for BORLAND
typedef void (Fl_Callback0)(Fl_Widget*);
typedef void (Fl_Callback1)(Fl_Widget*, long);

struct FL_EXPORT Fl_Label {
  const char* value;
  Fl_Image* image;
  Fl_Image* deimage;
  Fl_Font font;
  Fl_Fontsize size;
  Fl_Color color;
  Fl_Align align_;
  uchar type;

  void draw(int,int,int,int, Fl_Align) const ;
  void measure(int &w, int &h) const ;
};



class FL_EXPORT Fl_Widget {
  friend class Fl_Group;
  friend void Fl::focus(Fl_Widget*);

  Fl_Group* parent_;
  Fl_Callback* callback_;
  void* user_data_;
  int x_,y_,w_,h_;
  Fl_Label label_;
  unsigned int flags_;
  Fl_Color color_;
  Fl_Color color2_;
  uchar type_;
  uchar damage_;
  uchar box_;
  uchar when_;

  const char *tooltip_;

  Fl_Widget(const Fl_Widget &);
  Fl_Widget& operator=(const Fl_Widget &);

protected:

  Fl_Widget(int x, int y, int w, int h, const char *label=0L);

  void x(int v) {x_ = v;}
  void y(int v) {y_ = v;}
  void w(int v) {w_ = v;}
  void h(int v) {h_ = v;}
  unsigned int flags() const {return flags_;}
  void set_flag(unsigned int c) {flags_ |= c;}
  void clear_flag(unsigned int c) {flags_ &= ~c;}
  enum {
        INACTIVE        = 1<<0,   
        INVISIBLE       = 1<<1,   
        OUTPUT          = 1<<2,   
        NOBORDER        = 1<<3,   
        FORCE_POSITION  = 1<<4,   
        NON_MODAL       = 1<<5,   
        SHORTCUT_LABEL  = 1<<6,   
        CHANGED         = 1<<7,   
        OVERRIDE        = 1<<8,   
        VISIBLE_FOCUS   = 1<<9,   
        COPIED_LABEL    = 1<<10,  
        CLIP_CHILDREN   = 1<<11,  
        MENU_WINDOW     = 1<<12,  
        TOOLTIP_WINDOW  = 1<<13,  
        MODAL           = 1<<14,  
        NO_OVERLAY      = 1<<15,  
        GROUP_RELATIVE  = 1<<16,  
        COPIED_TOOLTIP  = 1<<17,  
        FULLSCREEN      = 1<<18,  
        MAC_USE_ACCENTS_MENU = 1<<19, 
        // (space for more flags)
        NEEDS_KEYBOARD  = 1<<20,  
        // a tiny bit more space for new flags...
        USERFLAG3       = 1<<29,  
        USERFLAG2       = 1<<30,  
        USERFLAG1       = 1<<31   
  };
  void draw_box() const;
  void draw_box(Fl_Boxtype t, Fl_Color c) const;
  void draw_box(Fl_Boxtype t, int x,int y,int w,int h, Fl_Color c) const;
  void draw_backdrop() const;
  void draw_focus() {draw_focus(box(),x(),y(),w(),h());}
  void draw_focus(Fl_Boxtype t, int x,int y,int w,int h) const;
  void draw_label() const;
  void draw_label(int, int, int, int) const;

public:

  virtual ~Fl_Widget();

  virtual void draw() = 0;

  virtual int handle(int event);

  int is_label_copied() const {return ((flags_ & COPIED_LABEL) ? 1 : 0);}

  Fl_Group* parent() const {return parent_;}

  void parent(Fl_Group* p) {parent_ = p;} // for hacks only, use Fl_Group::add()

  uchar type() const {return type_;}

  void type(uchar t) {type_ = t;}

  int x() const {return x_;}

  int y() const {return y_;}

  int w() const {return w_;}

  int h() const {return h_;}

  virtual void resize(int x, int y, int w, int h);

  int damage_resize(int,int,int,int);

  void position(int X,int Y) {resize(X,Y,w_,h_);}

  void size(int W,int H) {resize(x_,y_,W,H);}

  Fl_Align align() const {return label_.align_;}

  void align(Fl_Align alignment) {label_.align_ = alignment;}

  Fl_Boxtype box() const {return (Fl_Boxtype)box_;}

  void box(Fl_Boxtype new_box) {box_ = new_box;}

  Fl_Color color() const {return color_;}

  void color(Fl_Color bg) {color_ = bg;}

  Fl_Color selection_color() const {return color2_;}

  void selection_color(Fl_Color a) {color2_ = a;}

  void color(Fl_Color bg, Fl_Color sel) {color_=bg; color2_=sel;}

  const char* label() const {return label_.value;}

  void label(const char* text);

  void copy_label(const char *new_label);

  void label(Fl_Labeltype a, const char* b) {label_.type = a; label_.value = b;}

  Fl_Labeltype labeltype() const {return (Fl_Labeltype)label_.type;}

  void labeltype(Fl_Labeltype a) {label_.type = a;}

  Fl_Color labelcolor() const {return label_.color;}

  void labelcolor(Fl_Color c) {label_.color=c;}

  Fl_Font labelfont() const {return label_.font;}

  void labelfont(Fl_Font f) {label_.font=f;}

  Fl_Fontsize labelsize() const {return label_.size;}

  void labelsize(Fl_Fontsize pix) {label_.size=pix;}

  Fl_Image* image() {return label_.image;}
  const Fl_Image* image() const {return label_.image;}

  void image(Fl_Image* img) {label_.image=img;}

  void image(Fl_Image& img) {label_.image=&img;}

  Fl_Image* deimage() {return label_.deimage;}
  const Fl_Image* deimage() const {return label_.deimage;}

  void deimage(Fl_Image* img) {label_.deimage=img;}

  void deimage(Fl_Image& img) {label_.deimage=&img;}

  const char *tooltip() const {return tooltip_;}

  void tooltip(const char *text);               // see Fl_Tooltip
  void copy_tooltip(const char *text);          // see Fl_Tooltip

  Fl_Callback_p callback() const {return callback_;}

  void callback(Fl_Callback* cb, void* p) {callback_ = cb; user_data_ = p;}

  void callback(Fl_Callback* cb) {callback_ = cb;}

  void callback(Fl_Callback0* cb) {callback_ = (Fl_Callback*)cb;}

  void callback(Fl_Callback1* cb, long p = 0) {
    callback_ = (Fl_Callback*)cb;
    user_data_ = (void*)(fl_intptr_t)p;
  }

  void* user_data() const {return user_data_;}

  void user_data(void* v) {user_data_ = v;}

  long argument() const {return (long)(fl_intptr_t)user_data_;}

  void argument(long v) {user_data_ = (void*)(fl_intptr_t)v;}

  Fl_When when() const {return (Fl_When)when_;}

  void when(uchar i) {when_ = i;}

  unsigned int visible() const {return !(flags_&INVISIBLE);}

  int visible_r() const;

  virtual void show();

  virtual void hide();

  void set_visible() {flags_ &= ~INVISIBLE;}

  void clear_visible() {flags_ |= INVISIBLE;}

  unsigned int active() const {return !(flags_&INACTIVE);}

  int active_r() const;

  void activate();

  void deactivate();

  unsigned int output() const {return (flags_&OUTPUT);}

  void set_output() {flags_ |= OUTPUT;}

  void clear_output() {flags_ &= ~OUTPUT;}

  unsigned int takesevents() const {return !(flags_&(INACTIVE|INVISIBLE|OUTPUT));}

  unsigned int changed() const {return flags_ & CHANGED;}

  void set_changed() {flags_ |= CHANGED;}

  void clear_changed() {flags_ &= ~CHANGED;}

  void clear_active() {flags_ |= INACTIVE;}

  void set_active() {flags_ &= ~INACTIVE;}

  int take_focus();

  void set_visible_focus() { flags_ |= VISIBLE_FOCUS; }

  void clear_visible_focus() { flags_ &= ~VISIBLE_FOCUS; }

  void visible_focus(int v) { if (v) set_visible_focus(); else clear_visible_focus(); }

  unsigned int visible_focus() { return flags_ & VISIBLE_FOCUS; }

  static void default_callback(Fl_Widget *widget, void *data);

  void do_callback() {do_callback(this, user_data_);}

  void do_callback(Fl_Widget *widget, long arg) {
    do_callback(widget, (void*)(fl_intptr_t)arg);
  }

  // Causes a widget to invoke its callback function with arbitrary arguments.
  // Documentation and implementation in Fl_Widget.cxx
  void do_callback(Fl_Widget *widget, void *arg = 0);

  /* Internal use only. */
  int test_shortcut();
  /* Internal use only. */
  static unsigned int label_shortcut(const char *t);
  /* Internal use only. */
  static int test_shortcut(const char*, const bool require_alt = false);
  /* Internal use only. */
  void _set_fullscreen() {flags_ |= FULLSCREEN;}
  void _clear_fullscreen() {flags_ &= ~FULLSCREEN;}

  int contains(const Fl_Widget *w) const ;

  int inside(const Fl_Widget *wgt) const {return wgt ? wgt->contains(this) : 0;}

  void redraw();

  void redraw_label();

  uchar damage() const {return damage_;}

  void clear_damage(uchar c = 0) {damage_ = c;}

  void damage(uchar c);

  void damage(uchar c, int x, int y, int w, int h);

  void draw_label(int, int, int, int, Fl_Align) const;

  void measure_label(int& ww, int& hh) const {label_.measure(ww, hh);}

  Fl_Window* window() const ;
  Fl_Window* top_window() const;
  Fl_Window* top_window_offset(int& xoff, int& yoff) const;

  virtual Fl_Group* as_group() {return 0;}

  virtual Fl_Window* as_window() {return 0;}

  virtual class Fl_Gl_Window* as_gl_window() {return 0;}

  int use_accents_menu() { return flags() & MAC_USE_ACCENTS_MENU; }

  Fl_Color color2() const {return (Fl_Color)color2_;}

  void color2(unsigned a) {color2_ = a;}

  void shortcut_label(int value) {
    if (value)
      set_flag(SHORTCUT_LABEL);
    else
      clear_flag(SHORTCUT_LABEL);
  }

  int shortcut_label() const { return flags_ & SHORTCUT_LABEL; }
};

#define FL_RESERVED_TYPE 100

#endif