contrib/ncurses-5.4/c++/cursesp.h

   1 // * This makes emacs happy -*-Mode: C++;-*-
   2 /****************************************************************************
   3  * Copyright (c) 1998-2002,2003 Free Software Foundation, Inc.              *
   4  *                                                                          *
   5  * Permission is hereby granted, free of charge, to any person obtaining a  *
   6  * copy of this software and associated documentation files (the            *
   7  * "Software"), to deal in the Software without restriction, including      *
   8  * without limitation the rights to use, copy, modify, merge, publish,      *
   9  * distribute, distribute with modifications, sublicense, and/or sell       *
  10  * copies of the Software, and to permit persons to whom the Software is    *
  11  * furnished to do so, subject to the following conditions:                 *
  12  *                                                                          *
  13  * The above copyright notice and this permission notice shall be included  *
  14  * in all copies or substantial portions of the Software.                   *
  15  *                                                                          *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
  17  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
  18  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
  19  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
  20  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
  21  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
  22  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
  23  *                                                                          *
  24  * Except as contained in this notice, the name(s) of the above copyright   *
  25  * holders shall not be used in advertising or otherwise to promote the     *
  26  * sale, use or other dealings in this Software without prior written       *
  27  * authorization.                                                           *
  28  ****************************************************************************/
  29
  30 /****************************************************************************
  31  *   Author: Juergen Pfeifer, 1997                                          *
  32  ****************************************************************************/
  33
  34 #ifndef NCURSES_CURSESP_H_incl
  35 #define NCURSES_CURSESP_H_incl 1
  36
  37 // $Id: cursesp.h,v 1.18 2003/10/25 15:04:46 tom Exp $
  38
  39 #include <cursesw.h>
  40
  41 extern "C" {
  42 #  include <panel.h>
  43 }
  44
  45 class NCURSES_IMPEXP NCursesPanel : public NCursesWindow {
  46 protected:
  47   PANEL *p;
  48   static NCursesPanel *dummy;
  49
  50 private:
  51   // This structure is used for the panel's user data field to link the
  52   // PANEL* to the C++ object and to provide extra space for a user pointer.
  53   typedef struct {
  54     void*               m_user;      // the pointer for the user's data
  55     const NCursesPanel* m_back;      // backward pointer to C++ object
  56     const PANEL*        m_owner;     // the panel itself
  57   } UserHook;
  58
  59   void init();                       // Initialize the panel object
  60
  61 protected:
  62   void set_user(void *user) {
  63     UserHook* uptr = (UserHook*)::panel_userptr (p);
  64     assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==p);
  65     uptr->m_user = user;
  66   }
  67   // Set the user pointer of the panel.
  68
  69   void *get_user() {
  70     UserHook* uptr = (UserHook*)::panel_userptr (p);
  71     assert (uptr != 0 && uptr->m_back==this && uptr->m_owner==p);
  72     return uptr->m_user;
  73   }
  74
  75   void OnError (int err) const THROWS((NCursesPanelException)) {
  76     if (err==ERR)
  77       THROW(new NCursesPanelException (this, err));
  78   }
  79   // If err is equal to the curses error indicator ERR, an error handler
  80   // is called.
  81
  82   // Get a keystroke. Default implementation calls getch()
  83   virtual int getKey(void);
  84
  85 public:
  86   NCursesPanel(int lines,
  87                int cols,
  88                int begin_y = 0,
  89                int begin_x = 0)
  90     : NCursesWindow(lines,cols,begin_y,begin_x) {
  91       init();
  92   }
  93   // Create a panel with this size starting at the requested position.
  94
  95   NCursesPanel() : NCursesWindow(::stdscr) { init(); }
  96   // This constructor creates the default Panel associated with the
  97   // ::stdscr window
  98
  99   virtual ~NCursesPanel();
 100
 101   // basic manipulation
 102   inline void hide() {
 103     OnError (::hide_panel(p));
 104   }
 105   // Hide the panel. It stays in the stack but becomes invisible.
 106
 107   inline void show() {
 108     OnError (::show_panel(p));
 109   }
 110   // Show the panel, i.e. make it visible.
 111
 112   inline void top() {
 113     OnError (::top_panel(p));
 114   }
 115   // Make this panel the top panel in the stack.
 116
 117   inline void bottom() {
 118     OnError (::bottom_panel(p));
 119   }
 120   // Make this panel the bottom panel in the stack.
 121   // N.B.: The panel associated with ::stdscr is always on the bottom. So
 122   // actually bottom() makes the panel the first above ::stdscr.
 123
 124   virtual int mvwin(int y, int x) {
 125     OnError(::move_panel(p, y, x));
 126     return OK;
 127   }
 128
 129   inline bool hidden() const {
 130     return (::panel_hidden (p) ? TRUE : FALSE);
 131   }
 132   // Return TRUE if the panel is hidden, FALSE otherwise.
 133
 134 /* The functions panel_above() and panel_below() are not reflected in
 135    the NCursesPanel class. The reason for this is, that we cannot
 136    assume that a panel retrieved by those operations is one wrapped
 137    by a C++ class. Although this situation might be handled, we also
 138    need a reverse mapping from PANEL to NCursesPanel which needs some
 139    redesign of the low level stuff. At the moment, we define them in the
 140    interface but they will always produce an error. */
 141   inline NCursesPanel& above() const {
 142     OnError(ERR);
 143     return *dummy;
 144   }
 145
 146   inline NCursesPanel& below() const {
 147     OnError(ERR);
 148     return *dummy;
 149   }
 150
 151   // Those two are rewrites of the corresponding virtual members of
 152   // NCursesWindow
 153   virtual int refresh();
 154   // Propagate all panel changes to the virtual screen and update the
 155   // physical screen.
 156
 157   virtual int noutrefresh();
 158   // Propagate all panel changes to the virtual screen.
 159
 160   static void redraw();
 161   // Redraw all panels.
 162
 163   // decorations
 164   virtual void frame(const char* title=NULL,
 165                      const char* btitle=NULL);
 166   // Put a frame around the panel and put the title centered in the top line
 167   // and btitle in the bottom line.
 168
 169   virtual void boldframe(const char* title=NULL,
 170                          const char* btitle=NULL);
 171   // Same as frame(), but use highlighted attributes.
 172
 173   virtual void label(const char* topLabel,
 174                      const char* bottomLabel);
 175   // Put the title centered in the top line and btitle in the bottom line.
 176
 177   virtual void centertext(int row,const char* label);
 178   // Put the label text centered in the specified row.
 179 };
 180
 181 /* We use templates to provide a typesafe mechanism to associate
 182  * user data with a panel. A NCursesUserPanel<T> is a panel
 183  * associated with some user data of type T.
 184  */
 185 template<class T> class NCursesUserPanel : public NCursesPanel
 186 {
 187 public:
 188   NCursesUserPanel (int lines,
 189                     int cols,
 190                     int begin_y = 0,
 191                     int begin_x = 0,
 192                     const T* p_UserData = (T*)0)
 193     : NCursesPanel (lines, cols, begin_y, begin_x) {
 194       if (p)
 195         set_user ((void *)p_UserData);
 196   };
 197   // This creates an user panel of the requested size with associated
 198   // user data pointed to by p_UserData.
 199
 200   NCursesUserPanel(const T* p_UserData = (T*)0) : NCursesPanel() {
 201     if (p)
 202       set_user((void *)p_UserData);
 203   };
 204   // This creates an user panel associated with the ::stdscr and user data
 205   // pointed to by p_UserData.
 206
 207   virtual ~NCursesUserPanel() {};
 208
 209   T* UserData (void) const {
 210     return (T*)get_user ();
 211   };
 212   // Retrieve the user data associated with the panel.
 213
 214   virtual void setUserData (const T* p_UserData) {
 215     if (p)
 216       set_user ((void *)p_UserData);
 217   }
 218   // Associate the user panel with the user data pointed to by p_UserData.
 219 };
 220
 221 #endif // NCURSES_CURSESP_H_incl