include/wx/app.h

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        app.h
   3 // Purpose:     wxAppBase class and macros used for declaration of wxApp
   4 //              derived class in the user code
   5 // Author:      Julian Smart
   6 // Modified by:
   7 // Created:     01/02/97
   8 // RCS-ID:      $Id$
   9 // Copyright:   (c) Julian Smart and Markus Holzem
  10 // Licence:     wxWindows licence
  11 /////////////////////////////////////////////////////////////////////////////
  12
  13 #ifndef _WX_APP_H_BASE_
  14 #define _WX_APP_H_BASE_
  15
  16 #ifdef __GNUG__
  17     #pragma interface "appbase.h"
  18 #endif
  19
  20 // ----------------------------------------------------------------------------
  21 // typedefs
  22 // ----------------------------------------------------------------------------
  23
  24 #if defined(__WXMSW__) || defined (__WXPM__)
  25     class WXDLLEXPORT wxApp;
  26     typedef wxApp* (*wxAppInitializerFunction)();
  27 #else
  28     // returning wxApp* won't work with gcc
  29     #include "wx/object.h"
  30
  31     typedef wxObject* (*wxAppInitializerFunction)();
  32 #endif
  33
  34 // ----------------------------------------------------------------------------
  35 // headers we have to include here
  36 // ----------------------------------------------------------------------------
  37
  38 #include "wx/event.h"       // for the base class
  39
  40 #if wxUSE_GUI
  41     #include "wx/window.h"      // for wxTopLevelWindows
  42 #endif // wxUSE_GUI
  43
  44 #if wxUSE_LOG
  45     #include "wx/log.h"
  46 #endif
  47
  48 // ----------------------------------------------------------------------------
  49 // constants
  50 // ----------------------------------------------------------------------------
  51
  52 static const int wxPRINT_WINDOWS = 1;
  53 static const int wxPRINT_POSTSCRIPT = 2;
  54
  55 // ----------------------------------------------------------------------------
  56 // the common part of wxApp implementations for all platforms
  57 // ----------------------------------------------------------------------------
  58
  59 class WXDLLEXPORT wxAppBase : public wxEvtHandler
  60 {
  61 public:
  62     // the virtual functions which may/must be overridden in the derived class
  63     // -----------------------------------------------------------------------
  64 #ifdef __WXMAC_X__
  65     virtual ~wxAppBase() {}  // Added min for Mac X
  66 #endif
  67         // called during the program initialization, returning FALSE from here
  68         // prevents the program from continuing - it's a good place to create
  69         // the top level program window and return TRUE.
  70         //
  71         // Override: always in GUI application, rarely in console ones.
  72 #if wxUSE_GUI
  73     virtual bool OnInit() { return FALSE; };
  74 #else // !GUI
  75     virtual bool OnInit() { return TRUE; };
  76 #endif // wxUSE_GUI
  77
  78 #if wxUSE_GUI
  79         // a platform-dependent version of OnInit(): the code here is likely to
  80         // depend on the toolkit. default version does nothing.
  81         //
  82         // Override: rarely.
  83     virtual bool OnInitGui() { return TRUE; }
  84 #endif // wxUSE_GUI
  85
  86         // called to start program execution - the default version just enters
  87         // the main GUI loop in which events are received and processed until
  88         // the last window is not deleted (if GetExitOnFrameDelete) or
  89         // ExitMainLoop() is called. In console mode programs, the execution
  90         // of the program really starts here
  91         //
  92         // Override: rarely in GUI applications, always in console ones.
  93 #if wxUSE_GUI
  94     virtual int OnRun() { return MainLoop(); };
  95 #else // !GUI
  96     virtual int OnRun() = 0;
  97 #endif // wxUSE_GUI
  98
  99         // called after the main loop termination. This is a good place for
 100         // cleaning up (it may be too late in dtor) and is also useful if you
 101         // want to return some non-default exit code - this is just the return
 102         // value of this method.
 103         //
 104         // Override: often.
 105     virtual int OnExit();
 106
 107         // called when a fatal exception occurs, this function should take care
 108         // not to do anything which might provoke a nested exception! It may be
 109         // overridden if you wish to react somehow in non-default way (core
 110         // dump under Unix, application crash under Windows) to fatal program
 111         // errors, however extreme care should be taken if you don't want this
 112         // function to crash.
 113         //
 114         // Override: rarely.
 115     virtual void OnFatalException() { }
 116
 117     // the worker functions - usually not used directly by the user code
 118     // -----------------------------------------------------------------
 119
 120 #if wxUSE_GUI
 121         // execute the main GUI loop, the function returns when the loop ends
 122     virtual int MainLoop() = 0;
 123
 124         // exit the main GUI loop during the next iteration (i.e. it does not
 125         // stop the program immediately!)
 126     virtual void ExitMainLoop() = 0;
 127
 128         // returns TRUE if the program is initialized
 129     virtual bool Initialized() = 0;
 130
 131         // returns TRUE if there are unprocessed events in the event queue
 132     virtual bool Pending() = 0;
 133
 134         // process the first event in the event queue (blocks until an event
 135         // apperas if there are none currently)
 136     virtual void Dispatch() = 0;
 137 #endif // wxUSE_GUI
 138
 139     // application info: name, description, vendor
 140     // -------------------------------------------
 141
 142     // NB: all these should be set by the application itself, there are no
 143     //     reasonable default except for the application name which is taken to
 144     //     be argv[0]
 145
 146         // set/get the application name
 147     wxString GetAppName() const
 148     {
 149         if ( !m_appName )
 150             return m_className;
 151         else
 152             return m_appName;
 153     }
 154     void SetAppName(const wxString& name) { m_appName = name; }
 155
 156         // set/get the app class name
 157     wxString GetClassName() const { return m_className; }
 158     void SetClassName(const wxString& name) { m_className = name; }
 159
 160         // set/get the vendor name
 161     const wxString& GetVendorName() const { return m_vendorName; }
 162     void SetVendorName(const wxString& name) { m_vendorName = name; }
 163
 164 #if wxUSE_GUI
 165     // top level window functions
 166     // --------------------------
 167
 168         // set the "main" top level window
 169     void SetTopWindow(wxWindow *win) { m_topWindow = win; }
 170
 171         // return the "main" top level window (if it hadn't been set previously
 172         // with SetTopWindow(), will return just some top level window and, if
 173         // there are none, will return NULL)
 174     virtual wxWindow *GetTopWindow() const
 175     {
 176         if (m_topWindow)
 177             return m_topWindow;
 178         else if (wxTopLevelWindows.GetCount() > 0)
 179             return wxTopLevelWindows.GetFirst()->GetData();
 180         else
 181             return (wxWindow *)NULL;
 182     }
 183
 184         // control the exit behaviour: by default, the program will exit the
 185         // main loop (and so, usually, terminate) when the last top-level
 186         // program window is deleted. Beware that if you disabel this (with
 187         // SetExitOnFrameDelete(FALSE)), you'll have to call ExitMainLoop()
 188         // explicitly from somewhere.
 189     void SetExitOnFrameDelete(bool flag) { m_exitOnFrameDelete = flag; }
 190     bool GetExitOnFrameDelete() const { return m_exitOnFrameDelete; }
 191
 192 #endif // wxUSE_GUI
 193
 194     // miscellaneous customization functions
 195     // -------------------------------------
 196
 197 #if wxUSE_LOG
 198         // override this function to create default log target of arbitrary
 199         // user-defined class (default implementation creates a wxLogGui
 200         // object) - this log object is used by default by all wxLogXXX()
 201         // functions.
 202     virtual wxLog *CreateLogTarget()
 203 #if wxUSE_GUI
 204         { return new wxLogGui; }
 205 #else // !GUI
 206         { return new wxLogStderr; }
 207 #endif // wxUSE_GUI
 208 #endif // wxUSE_LOG
 209
 210 #if wxUSE_GUI
 211         // get the standard icon used by wxWin dialogs - this allows the user
 212         // to customize the standard dialogs. The 'which' parameter is one of
 213         // wxICON_XXX values
 214     virtual wxIcon GetStdIcon(int which) const = 0;
 215
 216         // VZ: what does this do exactly?
 217     void SetWantDebugOutput( bool flag ) { m_wantDebugOutput = flag; }
 218     bool GetWantDebugOutput() const { return m_wantDebugOutput; }
 219
 220         // set use of best visual flag (see below)
 221     void SetUseBestVisual( bool flag ) { m_useBestVisual = flag; }
 222     bool GetUseBestVisual() const { return m_useBestVisual; }
 223
 224         // set/get printing mode: see wxPRINT_XXX constants.
 225         //
 226         // default behaviour is the normal one for Unix: always use PostScript
 227         // printing.
 228     virtual void SetPrintMode(int WXUNUSED(mode)) { }
 229     int GetPrintMode() const { return wxPRINT_POSTSCRIPT; }
 230 #endif // wxUSE_GUI
 231
 232     // implementation only from now on
 233     // -------------------------------
 234
 235     // helpers for dynamic wxApp construction
 236     static void SetInitializerFunction(wxAppInitializerFunction fn)
 237         { m_appInitFn = fn; }
 238     static wxAppInitializerFunction GetInitializerFunction()
 239         { return m_appInitFn; }
 240
 241     // process all events in the wxPendingEvents list
 242     virtual void ProcessPendingEvents();
 243
 244     // access to the command line arguments
 245     int      argc;
 246     wxChar **argv;
 247
 248 //private:
 249 protected:
 250     // function used for dynamic wxApp creation
 251     static wxAppInitializerFunction m_appInitFn;
 252
 253     // application info (must be set from the user code)
 254     wxString m_vendorName,      // vendor name (ACME Inc)
 255              m_appName,         // app name
 256              m_className;       // class name
 257
 258     // if TRUE, exit the main loop when the last top level window is deleted
 259     bool m_exitOnFrameDelete;
 260
 261     // TRUE if the application wants to get debug output
 262     bool m_wantDebugOutput;
 263
 264     // TRUE if the apps whats to use the best visual on systems where
 265     // more than one are available (Sun, SGI, XFree86 4.0 ?)
 266     bool m_useBestVisual;
 267
 268 #if wxUSE_GUI
 269     // the main top level window - may be NULL
 270     wxWindow *m_topWindow;
 271 #endif // wxUSE_GUI
 272 };
 273
 274 // ----------------------------------------------------------------------------
 275 // now include the declaration of the real class
 276 // ----------------------------------------------------------------------------
 277
 278 #if wxUSE_GUI
 279     #if defined(__WXMSW__)
 280         #include "wx/msw/app.h"
 281     #elif defined(__WXMOTIF__)
 282         #include "wx/motif/app.h"
 283     #elif defined(__WXQT__)
 284         #include "wx/qt/app.h"
 285     #elif defined(__WXGTK__)
 286         #include "wx/gtk/app.h"
 287     #elif defined(__WXMAC__)
 288         #include "wx/mac/app.h"
 289     #elif defined(__WXPM__)
 290         #include "wx/os2/app.h"
 291     #elif defined(__WXSTUBS__)
 292         #include "wx/stubs/app.h"
 293     #endif
 294 #else // !GUI
 295     // can't use typedef because wxApp forward declared as a class
 296     class WXDLLEXPORT wxApp : public wxAppBase
 297     {
 298     };
 299 #endif // GUI/!GUI
 300
 301 // ----------------------------------------------------------------------------
 302 // the global data
 303 // ----------------------------------------------------------------------------
 304
 305 // the one and only application object - use of wxTheApp in application code
 306 // is discouraged, consider using DECLARE_APP() after which you may call
 307 // wxGetApp() which will return the object of the correct type (i.e. MyApp and
 308 // not wxApp)
 309 WXDLLEXPORT_DATA(extern wxApp*) wxTheApp;
 310
 311 // ----------------------------------------------------------------------------
 312 // global functions
 313 // ----------------------------------------------------------------------------
 314
 315 // event loop related functions only work in GUI programs
 316 // ------------------------------------------------------
 317
 318 // Force an exit from main loop
 319 extern void WXDLLEXPORT wxExit();
 320
 321 // Yield to other apps/messages
 322 extern bool WXDLLEXPORT wxYield();
 323
 324 // Yield to other apps/messages
 325 extern void WXDLLEXPORT wxWakeUpIdle();
 326
 327 // Post a message to the given eventhandler which will be processed during the
 328 // next event loop iteration
 329 inline void WXDLLEXPORT wxPostEvent(wxEvtHandler *dest, wxEvent& event)
 330 {
 331     wxCHECK_RET( dest, wxT("need an object to post event to in wxPostEvent") );
 332
 333 #if wxUSE_GUI
 334     dest->AddPendingEvent(event);
 335 #else
 336     dest->ProcessEvent(event);
 337 #endif // wxUSE_GUI
 338 }
 339
 340 // console applications may avoid using DECLARE_APP and IMPLEMENT_APP macros
 341 // and call these functions instead at the program startup and termination
 342 // -------------------------------------------------------------------------
 343
 344 #if !wxUSE_GUI
 345
 346 // initialize the library (may be called as many times as needed, but each
 347 // call to wxInitialize() must be matched by wxUninitialize())
 348 extern bool WXDLLEXPORT wxInitialize();
 349
 350 // clean up - the library can't be used any more after the last call to
 351 // wxUninitialize()
 352 extern void WXDLLEXPORT wxUninitialize();
 353
 354 #endif // !wxUSE_GUI
 355
 356 // ----------------------------------------------------------------------------
 357 // macros for dynamic creation of the application object
 358 // ----------------------------------------------------------------------------
 359
 360 // Having a global instance of this class allows wxApp to be aware of the app
 361 // creator function. wxApp can then call this function to create a new app
 362 // object. Convoluted, but necessary.
 363
 364 class WXDLLEXPORT wxAppInitializer
 365 {
 366 public:
 367     wxAppInitializer(wxAppInitializerFunction fn)
 368         { wxApp::SetInitializerFunction(fn); }
 369 };
 370
 371 // Here's a macro you can use if your compiler really, really wants main() to
 372 // be in your main program (e.g. hello.cpp). Now IMPLEMENT_APP should add this
 373 // code if required.
 374
 375 #if !wxUSE_GUI || defined(__WXMOTIF__) || defined(__WXGTK__) || defined(__WXPM__) || (defined(__WXMAC__) && defined(__UNIX__))
 376     #define IMPLEMENT_WXWIN_MAIN \
 377         extern int wxEntry( int argc, char *argv[] ); \
 378         int main(int argc, char *argv[]) { return wxEntry(argc, argv); }
 379 #elif defined(__WXMSW__) && defined(WXUSINGDLL)
 380     // NT defines APIENTRY, 3.x not
 381     #if !defined(WXAPIENTRY)
 382         #define WXAPIENTRY WXFAR wxSTDCALL
 383     #endif
 384
 385     #include <windows.h>
 386     #include "wx/msw/winundef.h"
 387
 388     #define IMPLEMENT_WXWIN_MAIN \
 389         extern "C" int WXAPIENTRY WinMain(HINSTANCE hInstance,\
 390                                           HINSTANCE hPrevInstance,\
 391                                           LPSTR m_lpCmdLine, int nCmdShow)\
 392         {\
 393             return wxEntry((WXHINSTANCE) hInstance,\
 394                            (WXHINSTANCE) hPrevInstance,\
 395                            m_lpCmdLine, nCmdShow);\
 396         }
 397 #else
 398     #define IMPLEMENT_WXWIN_MAIN
 399 #endif
 400
 401 // Use this macro exactly once, the argument is the name of the wxApp-derived
 402 // class which is the class of your application.
 403 #define IMPLEMENT_APP(appname)                           \
 404     wxApp *wxCreateApp() { return new appname; }         \
 405     wxAppInitializer wxTheAppInitializer((wxAppInitializerFunction) wxCreateApp); \
 406     appname& wxGetApp() { return *(appname *)wxTheApp; } \
 407     IMPLEMENT_WXWIN_MAIN
 408
 409 // Use this macro if you want to define your own main() or WinMain() function
 410 // and call wxEntry() from there.
 411 #define IMPLEMENT_APP_NO_MAIN(appname)                   \
 412     wxApp *wxCreateApp() { return new appname; }         \
 413     wxAppInitializer wxTheAppInitializer((wxAppInitializerFunction) wxCreateApp); \
 414     appname& wxGetApp() { return *(appname *)wxTheApp; }
 415
 416 #define DECLARE_APP(appname) extern appname& wxGetApp();
 417
 418 #endif
 419     // _WX_APP_H_BASE_