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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 1.29 2008/08/16 17:20:23 tom Exp $
38 
39 #include <cursesw.h>
40 
41 extern "C" {
42 #  include <panel.h>
43 }
44 
45 class NCURSES_IMPEXP NCursesPanel
46   : public NCursesWindow
47 {
48 protected:
49   PANEL *p;
50   static NCursesPanel *dummy;
51 
52 private:
53   // This structure is used for the panel's user data field to link the
54   // PANEL* to the C++ object and to provide extra space for a user pointer.
55   typedef struct {
56     void*               m_user;      // the pointer for the user's data
57     const NCursesPanel* m_back;      // backward pointer to C++ object
58     const PANEL*        m_owner;     // the panel itself
59   } UserHook;
60 
UserPointer()61   inline UserHook *UserPointer()
62   {
63     UserHook* uptr = reinterpret_cast<UserHook*>(
64                            const_cast<void *>(::panel_userptr (p)));
65     return uptr;
66   }
67 
68   void init();                       // Initialize the panel object
69 
70 protected:
set_user(void * user)71   void set_user(void *user)
72   {
73     UserHook* uptr = UserPointer();
74     if (uptr != 0 && uptr->m_back==this && uptr->m_owner==p) {
75       uptr->m_user = user;
76     }
77   }
78   // Set the user pointer of the panel.
79 
get_user()80   void *get_user()
81   {
82     UserHook* uptr = UserPointer();
83     void *result = 0;
84     if (uptr != 0 && uptr->m_back==this && uptr->m_owner==p)
85       result = uptr->m_user;
86     return result;
87   }
88 
OnError(int err)89   void OnError (int err) const THROWS(NCursesPanelException)
90   {
91     if (err==ERR)
92       THROW(new NCursesPanelException (this, err));
93   }
94   // If err is equal to the curses error indicator ERR, an error handler
95   // is called.
96 
97   // Get a keystroke. Default implementation calls getch()
98   virtual int getKey(void);
99 
100 public:
101   NCursesPanel(int nlines,
102 	       int ncols,
103 	       int begin_y = 0,
104 	       int begin_x = 0)
NCursesWindow(nlines,ncols,begin_y,begin_x)105     : NCursesWindow(nlines,ncols,begin_y,begin_x), p(0)
106   {
107     init();
108   }
109   // Create a panel with this size starting at the requested position.
110 
NCursesPanel()111   NCursesPanel()
112     : NCursesWindow(::stdscr), p(0)
113   {
114     init();
115   }
116   // This constructor creates the default Panel associated with the
117   // ::stdscr window
118 
119   NCursesPanel& operator=(const NCursesPanel& rhs)
120   {
121     if (this != &rhs) {
122       *this = rhs;
123       NCursesWindow::operator=(rhs);
124     }
125     return *this;
126   }
127 
NCursesPanel(const NCursesPanel & rhs)128   NCursesPanel(const NCursesPanel& rhs)
129     : NCursesWindow(rhs),
130       p(rhs.p)
131   {
132   }
133 
134   virtual ~NCursesPanel();
135 
136   // basic manipulation
hide()137   inline void hide()
138   {
139     OnError (::hide_panel(p));
140   }
141   // Hide the panel. It stays in the stack but becomes invisible.
142 
show()143   inline void show()
144   {
145     OnError (::show_panel(p));
146   }
147   // Show the panel, i.e. make it visible.
148 
top()149   inline void top()
150   {
151     OnError (::top_panel(p));
152   }
153   // Make this panel the top panel in the stack.
154 
bottom()155   inline void bottom()
156   {
157     OnError (::bottom_panel(p));
158   }
159   // Make this panel the bottom panel in the stack.
160   // N.B.: The panel associated with ::stdscr is always on the bottom. So
161   // actually bottom() makes the panel the first above ::stdscr.
162 
mvwin(int y,int x)163   virtual int mvwin(int y, int x)
164   {
165     OnError(::move_panel(p, y, x));
166     return OK;
167   }
168 
hidden()169   inline bool hidden() const
170   {
171     return (::panel_hidden (p) ? TRUE : FALSE);
172   }
173   // Return TRUE if the panel is hidden, FALSE otherwise.
174 
175 /* The functions panel_above() and panel_below() are not reflected in
176    the NCursesPanel class. The reason for this is, that we cannot
177    assume that a panel retrieved by those operations is one wrapped
178    by a C++ class. Although this situation might be handled, we also
179    need a reverse mapping from PANEL to NCursesPanel which needs some
180    redesign of the low level stuff. At the moment, we define them in the
181    interface but they will always produce an error. */
above()182   inline NCursesPanel& above() const
183   {
184     OnError(ERR);
185     return *dummy;
186   }
187 
below()188   inline NCursesPanel& below() const
189   {
190     OnError(ERR);
191     return *dummy;
192   }
193 
194   // Those two are rewrites of the corresponding virtual members of
195   // NCursesWindow
196   virtual int refresh();
197   // Propagate all panel changes to the virtual screen and update the
198   // physical screen.
199 
200   virtual int noutrefresh();
201   // Propagate all panel changes to the virtual screen.
202 
203   static void redraw();
204   // Redraw all panels.
205 
206   // decorations
207   virtual void frame(const char* title=NULL,
208 		     const char* btitle=NULL);
209   // Put a frame around the panel and put the title centered in the top line
210   // and btitle in the bottom line.
211 
212   virtual void boldframe(const char* title=NULL,
213 			 const char* btitle=NULL);
214   // Same as frame(), but use highlighted attributes.
215 
216   virtual void label(const char* topLabel,
217 		     const char* bottomLabel);
218   // Put the title centered in the top line and btitle in the bottom line.
219 
220   virtual void centertext(int row,const char* label);
221   // Put the label text centered in the specified row.
222 };
223 
224 /* We use templates to provide a typesafe mechanism to associate
225  * user data with a panel. A NCursesUserPanel<T> is a panel
226  * associated with some user data of type T.
227  */
228 template<class T> class NCursesUserPanel : public NCursesPanel
229 {
230 public:
231   NCursesUserPanel (int nlines,
232 		    int ncols,
233 		    int begin_y = 0,
234 		    int begin_x = 0,
235 		    const T* p_UserData = STATIC_CAST(T*)(0))
NCursesPanel(nlines,ncols,begin_y,begin_x)236     : NCursesPanel (nlines, ncols, begin_y, begin_x)
237   {
238       if (p)
239 	set_user (const_cast<void *>(p_UserData));
240   };
241   // This creates an user panel of the requested size with associated
242   // user data pointed to by p_UserData.
243 
NCursesPanel()244   NCursesUserPanel(const T* p_UserData = STATIC_CAST(T*)(0)) : NCursesPanel()
245   {
246     if (p)
247       set_user(const_cast<void *>(p_UserData));
248   };
249   // This creates an user panel associated with the ::stdscr and user data
250   // pointed to by p_UserData.
251 
~NCursesUserPanel()252   virtual ~NCursesUserPanel() {};
253 
UserData(void)254   T* UserData (void) const
255   {
256     return reinterpret_cast<T*>(get_user ());
257   };
258   // Retrieve the user data associated with the panel.
259 
setUserData(const T * p_UserData)260   virtual void setUserData (const T* p_UserData)
261   {
262     if (p)
263       set_user (const_cast<void *>(p_UserData));
264   }
265   // Associate the user panel with the user data pointed to by p_UserData.
266 };
267 
268 #endif /* NCURSES_CURSESP_H_incl */
269