src/combox.h

   1 // -*- C++ -*-
   2 /*
   3  *  Combox: A combination of two objects (a button and a browser) is
   4  *          encapsulated to get a combobox-like object. All XForms
   5  *          functions are hidden.
   6  *
   7  *  GNU Copyleft (C) 1996 Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
   8  *                        and the LyX Team.
   9  *
  10  *  Dependencies:  Only XForms, but created to be used with LyX.
  11  *
  12  */
  13
  14 /* Change log:
  15  *
  16  *  2/06/1996,   Alejandro Aguilar Sierra
  17  *    Created and tested.
  18  *
  19  *  4/06/1996,   Alejandro Aguilar Sierra
  20  *    Added droplist mode (a button with a black down arrow at right)
  21  *    and support for middle and right buttons, as XForms choice object.
  22  */
  23
  24 #ifndef _COMBOX_H_
  25 #define _COMBOX_H_
  26
  27 #ifdef __GNUG__
  28 #pragma interface
  29 #endif
  30
  31 #include FORMS_H_LOCATION
  32 #include <stdlib.h>
  33
  34 ///
  35 enum combox_type {
  36         ///
  37         FL_COMBOX_NORMAL,
  38         ///
  39         FL_COMBOX_DROPLIST,
  40         ///
  41         FL_COMBOX_INPUT
  42 };
  43
  44 /// callback prototype
  45 typedef void (*FL_COMBO_CB) (int, void*);
  46 /// pre post prototype
  47 typedef void (*FL_COMBO_PRE_POST) ();
  48
  49
  50 ///
  51 class Combox {
  52 public:
  53         ///
  54         Combox(combox_type t=FL_COMBOX_NORMAL);
  55         ///
  56         ~Combox();
  57
  58         /** To add this object to a form. Note that there are two heights
  59          for normal (button) and expanded (browser) mode each. */
  60         void add(int x, int y, int w, int hmin, int hmax);
  61
  62         /// Add lines. Same as for fl_browser object
  63         void addline(char const*);
  64         /// Add lines. Same as for fl_browser object
  65         void addto(char const*);
  66
  67         /// Returns the selected item
  68         int get();
  69
  70         /// Returns a pointer to the selected line of text
  71         char const*getline();
  72
  73         ///  Select an arbitrary item
  74         void select(int);
  75         ///
  76         bool select_text(char const*);
  77
  78         ///  Clear all the list
  79         void clear();
  80
  81         /// Is the combox cleared (empty)
  82         bool empty() { return is_empty; }
  83
  84         /// Remove the objects from the form they are in.
  85         void remove();
  86
  87         /**  Assign a callback to this object. The callback should be a void
  88          function with a int and a void pointer as parameters. */
  89         void setcallback(FL_COMBO_CB, void *);
  90
  91         ///  Pre handler
  92         void setpre(FL_COMBO_PRE_POST);
  93         /// Post handler
  94         void setpost(FL_COMBO_PRE_POST);
  95
  96         ///  XForms attributes
  97         void resize(unsigned);
  98         ///
  99         void gravity(unsigned, unsigned);
 100         ///
 101         void activate();
 102         ///
 103         void deactivate();
 104         ///
 105         void shortcut(char const*, int);
 106         ///
 107         void Redraw();
 108         ///
 109         void Show();
 110         ///
 111         static void combo_cb(FL_OBJECT *, long);
 112         ///
 113         static void input_cb(FL_OBJECT *, long);
 114         ///
 115         static int  peek_event(FL_FORM *, void *);
 116  protected:
 117         /// At least Hide should not be public
 118         void Hide(int who = 0);
 119         ///
 120         FL_OBJECT *browser;
 121  private:
 122         ///
 123         combox_type type;
 124         ///
 125         int bw, bh;
 126         ///
 127         int sel;
 128         ///
 129         bool is_empty;
 130         ///
 131         FL_COMBO_CB callback;
 132         ///
 133         void *cb_arg;
 134         ///
 135         FL_COMBO_PRE_POST _pre;
 136         ///
 137         FL_COMBO_PRE_POST _post;
 138         ///
 139         FL_OBJECT *button;
 140         ///
 141         FL_OBJECT *label;
 142         ///
 143         FL_FORM* form;
 144 };
 145
 146
 147
 148 //-----------------  Inline methods  ---------------------------
 149
 150 inline
 151 void Combox::addto(char const* text)
 152 {
 153         if (browser) {
 154                 fl_addto_browser(browser, text);
 155                 is_empty = false;
 156         }
 157 }
 158
 159 inline
 160 void Combox::resize(unsigned r)
 161 {
 162    fl_set_object_resize(button, r);
 163    if (label!=button) fl_set_object_resize(label, r);
 164 }
 165
 166 inline
 167 void Combox::gravity(unsigned g1, unsigned g2)
 168 {
 169    fl_set_object_gravity(button, g1, g2);
 170    if (label!=button) fl_set_object_gravity(label, g1, g2);
 171 }
 172
 173 inline
 174 void Combox::shortcut(char const* s, int i)
 175 {
 176    if (button)
 177       fl_set_object_shortcut(button,s,i);
 178 }
 179
 180 inline
 181 void Combox::setcallback(FL_COMBO_CB cb, void *a = 0)
 182 {
 183    callback = cb;
 184    cb_arg = a;
 185 }
 186
 187 inline
 188 void Combox::setpre(FL_COMBO_PRE_POST cb)
 189 {
 190         _pre = cb;
 191 }
 192
 193 inline
 194 void Combox::setpost(FL_COMBO_PRE_POST cb)
 195 {
 196         _post = cb;
 197 }
 198
 199 inline
 200 int Combox::get()
 201 {
 202    return sel;
 203 }
 204
 205 inline
 206 char const*Combox::getline()
 207 {
 208     if (type==FL_COMBOX_INPUT)
 209       return fl_get_input(label);
 210     else
 211       return ((browser) ? fl_get_browser_line(browser, sel): (char const*)0);
 212 }
 213
 214 #endif
 215
 216