app.h

浙江大学的悟空嵌入式系统模拟器

/////////////////////////////////////////////////////////////////////////////
// Name:        wx/app.h
// Purpose:     wxAppBase class and macros used for declaration of wxApp
//              derived class in the user code
// Author:      Julian Smart
// Modified by:
// Created:     01/02/97
// RCS-ID:      $Id: app.h,v 1.1 2005/03/16 06:48:43 kehc Exp $
// Copyright:   (c) Julian Smart and Markus Holzem
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#ifndef _WX_APP_H_BASE_
#define _WX_APP_H_BASE_

#if defined(__GNUG__) && !defined(__APPLE__)
    #pragma interface "appbase.h"
#endif

// ----------------------------------------------------------------------------
// headers we have to include here
// ----------------------------------------------------------------------------

#include "wx/event.h"       // for the base class

#if wxUSE_GUI
    #include "wx/window.h"  // for wxTopLevelWindows
#endif // wxUSE_GUI

#if WXWIN_COMPATIBILITY_2_2
    #include "wx/icon.h"
#endif

#include "wx/build.h"

// ----------------------------------------------------------------------------
// typedefs
// ----------------------------------------------------------------------------
// Do includes first to insure that even wxBase consistently uses
// the wxMSW case for defining wxAppInitializerFunction.
// (otherwise, __WXMSW__ will not yet be set, if app.h is the
//  first file to be included).

#if (defined(__WXMSW__) && !defined(__WXMICROWIN__)) || defined (__WXPM__)
    class WXDLLEXPORT wxApp;
    typedef wxApp* (*wxAppInitializerFunction)();
#else
    // returning wxApp* won't work with gcc
    #include "wx/object.h"

    typedef wxObject* (*wxAppInitializerFunction)();
#endif

class WXDLLEXPORT wxCmdLineParser;
class WXDLLEXPORT wxLog;
class WXDLLEXPORT wxMessageOutput;

// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------

static const int wxPRINT_WINDOWS = 1;
static const int wxPRINT_POSTSCRIPT = 2;

// ----------------------------------------------------------------------------
// support for framebuffer ports
// ----------------------------------------------------------------------------

#if wxUSE_GUI
// VS: Fullscreen/framebuffer application needs to choose display mode prior
//     to wxWindows initialization. This class holds information about display
//     mode. It is used by  wxApp::Set/GetDisplayMode.
class WXDLLEXPORT wxDisplayModeInfo
{
public:
    wxDisplayModeInfo() : m_ok(FALSE) {}
    wxDisplayModeInfo(unsigned width, unsigned height, unsigned depth)
        : m_width(width), m_height(height), m_depth(depth), m_ok(TRUE) {}

    unsigned GetWidth() const { return m_width; }
    unsigned GetHeight() const { return m_height; }
    unsigned GetDepth() const { return m_depth; }
    bool IsOk() const { return m_ok; }

private:
    unsigned m_width, m_height, m_depth;
    bool     m_ok;
};
#endif

// ----------------------------------------------------------------------------
// the common part of wxApp implementations for all platforms
// ----------------------------------------------------------------------------

class WXDLLEXPORT wxAppBase : public wxEvtHandler
{
    DECLARE_NO_COPY_CLASS(wxAppBase)

public:
    wxAppBase();
    virtual ~wxAppBase();

    // the virtual functions which may/must be overridden in the derived class
    // -----------------------------------------------------------------------

        // called during the program initialization, returning FALSE from here
        // prevents the program from continuing - it's a good place to create
        // the top level program window and return TRUE.
        //
        // Override: always in GUI application, rarely in console ones.
    virtual bool OnInit();

#if wxUSE_GUI
        // a platform-dependent version of OnInit(): the code here is likely to
        // depend on the toolkit. default version does nothing.
        //
        // Override: rarely.
    virtual bool OnInitGui();
#endif // wxUSE_GUI

        // called to start program execution - the default version just enters
        // the main GUI loop in which events are received and processed until
        // the last window is not deleted (if GetExitOnFrameDelete) or
        // ExitMainLoop() is called. In console mode programs, the execution
        // of the program really starts here
        //
        // Override: rarely in GUI applications, always in console ones.
#if wxUSE_GUI
    virtual int OnRun();
#else // !GUI
    virtual int OnRun() = 0;
#endif // wxUSE_GUI

        // called after the main loop termination. This is a good place for
        // cleaning up (it may be too late in dtor) and is also useful if you
        // want to return some non-default exit code - this is just the return
        // value of this method.
        //
        // Override: often.
    virtual int OnExit();

        // called when a fatal exception occurs, this function should take care
        // not to do anything which might provoke a nested exception! It may be
        // overridden if you wish to react somehow in non-default way (core
        // dump under Unix, application crash under Windows) to fatal program
        // errors, however extreme care should be taken if you don't want this
        // function to crash.
        //
        // Override: rarely.
    virtual void OnFatalException() { }

    // the worker functions - usually not used directly by the user code
    // -----------------------------------------------------------------

#if wxUSE_GUI
        // execute the main GUI loop, the function returns when the loop ends
    virtual int MainLoop() = 0;

        // exit the main GUI loop during the next iteration (i.e. it does not
        // stop the program immediately!)
    virtual void ExitMainLoop() = 0;

        // returns TRUE if the program is initialized
    virtual bool Initialized() = 0;

        // returns TRUE if there are unprocessed events in the event queue
    virtual bool Pending() = 0;

        // process the first event in the event queue (blocks until an event
        // apperas if there are none currently)
    virtual void Dispatch() = 0;

        // process all currently pending events right now
        //
        // it is an error to call Yield() recursively unless the value of
        // onlyIfNeeded is TRUE
        //
        // WARNING: this function is dangerous as it can lead to unexpected
        //          reentrancies (i.e. when called from an event handler it
        //          may result in calling the same event handler again), use
        //          with _extreme_ care or, better, don't use at all!
    virtual bool Yield(bool onlyIfNeeded = FALSE) = 0;

        // this virtual function is called in the GUI mode when the application
        // becomes idle and normally just sends wxIdleEvent to all interested
        // parties
        //
        // it should return TRUE if more idle events are needed, FALSE if not
    virtual bool ProcessIdle() = 0;
#endif // wxUSE_GUI

    // application info: name, description, vendor
    // -------------------------------------------

    // NB: all these should be set by the application itself, there are no
    //     reasonable default except for the application name which is taken to
    //     be argv[0]

        // set/get the application name
    wxString GetAppName() const
    {
        if ( !m_appName )
            return m_className;
        else
            return m_appName;
    }
    void SetAppName(const wxString& name) { m_appName = name; }

        // set/get the app class name
    wxString GetClassName() const { return m_className; }
    void SetClassName(const wxString& name) { m_className = name; }

        // set/get the vendor name
    const wxString& GetVendorName() const { return m_vendorName; }
    void SetVendorName(const wxString& name) { m_vendorName = name; }

#if wxUSE_GUI
    // top level window functions
    // --------------------------

        // return TRUE if our app has focus
    virtual bool IsActive() const { return m_isActive; }

        // set the "main" top level window
    void SetTopWindow(wxWindow *win) { m_topWindow = win; }

        // return the "main" top level window (if it hadn't been set previously
        // with SetTopWindow(), will return just some top level window and, if
        // there are none, will return NULL)
    virtual wxWindow *GetTopWindow() const
    {
        if (m_topWindow)
            return m_topWindow;
        else if (wxTopLevelWindows.GetCount() > 0)
            return wxTopLevelWindows.GetFirst()->GetData();
        else
            return (wxWindow *)NULL;
    }

        // control the exit behaviour: by default, the program will exit the
        // main loop (and so, usually, terminate) when the last top-level
        // program window is deleted. Beware that if you disable this behaviour
        // (with SetExitOnFrameDelete(FALSE)), you'll have to call
        // ExitMainLoop() explicitly from somewhere.
    void SetExitOnFrameDelete(bool flag)
        { m_exitOnFrameDelete = flag ? Yes : No; }
    bool GetExitOnFrameDelete() const
        { return m_exitOnFrameDelete == Yes; }

#endif // wxUSE_GUI

    // cmd line parsing stuff
    // ----------------------

    // all of these methods may be overridden in the derived class to
    // customize the command line parsing (by default only a few standard
    // options are handled)
    //
    // you also need to call wxApp::OnInit() from YourApp::OnInit() for all
    // this to work

#if wxUSE_CMDLINE_PARSER
    // this one is called from OnInit() to add all supported options
    // to the given parser
    virtual void OnInitCmdLine(wxCmdLineParser& parser);

    // called after successfully parsing the command line, return TRUE
    // to continue and FALSE to exit
    virtual bool OnCmdLineParsed(wxCmdLineParser& parser);

    // called if "--help" option was specified, return TRUE to continue
    // and FALSE to exit
    virtual bool OnCmdLineHelp(wxCmdLineParser& parser);

    // called if incorrect command line options were given, return
    // FALSE to abort and TRUE to continue
    virtual bool OnCmdLineError(wxCmdLineParser& parser);
#endif // wxUSE_CMDLINE_PARSER

    // miscellaneous customization functions
    // -------------------------------------

#if wxUSE_LOG
        // override this function to create default log target of arbitrary
        // user-defined class (default implementation creates a wxLogGui
        // object) - this log object is used by default by all wxLogXXX()
        // functions.
    virtual wxLog *CreateLogTarget();
#endif // wxUSE_LOG

        // similar to CreateLogTarget() but for the global wxMessageOutput
        // object
    virtual wxMessageOutput *CreateMessageOutput();

#if wxUSE_GUI

#if WXWIN_COMPATIBILITY_2_2
        // get the standard icon used by wxWin dialogs - this allows the user
        // to customize the standard dialogs. The 'which' parameter is one of
        // wxICON_XXX values
    virtual wxIcon GetStdIcon(int WXUNUSED(which)) const { return wxNullIcon; }
#endif

        // Get display mode that is used use. This is only used in framebuffer wxWin ports
        // (such as wxMGL).
    virtual wxDisplayModeInfo GetDisplayMode() const { return wxDisplayModeInfo(); }
        // Set display mode to use. This is only used in framebuffer wxWin ports