X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3c4f71cc3d63fb7bdfbd6cec3e39c8a8679f3e60..608129e541994517c5c1db9660693443661c62bb:/docs/doxygen/overviews/helloworld.h diff --git a/docs/doxygen/overviews/helloworld.h b/docs/doxygen/overviews/helloworld.h index 8bf019fac3..d19670c21f 100644 --- a/docs/doxygen/overviews/helloworld.h +++ b/docs/doxygen/overviews/helloworld.h @@ -8,173 +8,173 @@ /** - @page overview_helloworld Hello World Example - - Many people have requested a mini-sample to be published here - so that some quick judgment concerning syntax - and basic principles can be made, so here we go. - - First, you have to include wxWidgets' header files, of course. This can - be done on a file by file basis (such as @#include "wx/window.h") - or using one global include (@#include "wx/wx.h"). This is - also useful on platforms which support precompiled headers such - as all major compilers on the Windows platform and GCC on Unix platforms. - - @code - // - // file name: hworld.cpp - // - // purpose: wxWidgets "Hello world" - // - - // For compilers that support precompilation, includes "wx/wx.h". - #include "wx/wxprec.h" - - #ifdef __BORLANDC__ - #pragma hdrstop - #endif - - #ifndef WX_PRECOMP - #include "wx/wx.h" - #endif - @endcode - - Practically every app should define a new class derived from wxApp. - By overriding wxApp's OnInit() the program can be initialized, - e.g. by creating a new main window. - - @code - class MyApp: public wxApp - { - virtual bool OnInit(); - }; - @endcode - - The main window is created by deriving a class from wxFrame and - giving it a menu and a status bar in its constructor. Also, any class - that wishes to respond to any "event" (such as mouse clicks or - messages from the menu or a button) must declare an event table - using the macro below. - - Finally, the way to react to such events must be done in "handlers". - In our sample, we react to two menu items, one for "Quit" and one for - displaying an "About" window. These handlers should not be virtual. - - @code - class MyFrame: public wxFrame - { - public: - MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size); - - void OnQuit(wxCommandEvent& event); - void OnAbout(wxCommandEvent& event); - - private: - DECLARE_EVENT_TABLE() - }; - @endcode - - In order to be able to react to a menu command, it must be given a unique - identifier such as a const or an enum. - - @code - enum - { - ID_Quit = 1, - ID_About, - }; - @endcode - - We then proceed to actually implement an event table in which the events - are routed to their respective handler functions in the class MyFrame. - - There are predefined macros for routing all common events, ranging from - the selection of a list box entry to a resize event when a user resizes - a window on the screen. If -1 is given as the ID, the given handler will be - invoked for any event of the specified type, so that you could add just - one entry in the event table for all menu commands or all button commands etc. - - The origin of the event can still be distinguished in the event handler as - the (only) parameter in an event handler is a reference to a wxEvent object, - which holds various information about the event (such as the ID of and a - pointer to the class, which emitted the event). - - @code - BEGIN_EVENT_TABLE(MyFrame, wxFrame) - EVT_MENU(ID_Quit, MyFrame::OnQuit) - EVT_MENU(ID_About, MyFrame::OnAbout) - END_EVENT_TABLE() - @endcode - - As in all programs there must be a "main" function. Under wxWidgets main is implemented - using this macro, which creates an application instance and starts the program. - - @code - IMPLEMENT_APP(MyApp) - @endcode - - As mentioned above, wxApp::OnInit() is called upon startup and should be - used to initialize the program, maybe showing a "splash screen" and creating - the main window (or several). The frame should get a title bar text ("Hello World") - and a position and start-up size. One frame can also be declared to be the - top window. Returning @true indicates a successful initialization. - - @code - bool MyApp::OnInit() - { - MyFrame *frame = new MyFrame( "Hello World", wxPoint(50,50), wxSize(450,340) ); - frame->Show( true ); - SetTopWindow( frame ); - return true; - } - @endcode - - In the constructor of the main window (or later on) we create a menu with two menu - items as well as a status bar to be shown at the bottom of the main window. Both have - to be "announced" to the frame with respective calls. - - @code - MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size) +@page overview_helloworld Hello World Example + +Many people have requested a mini-sample to be published here +so that some quick judgment concerning syntax +and basic principles can be made, so here we go. + +First, you have to include wxWidgets' header files, of course. This can +be done on a file by file basis (such as @#include "wx/window.h") +or using one global include (@#include "wx/wx.h"). This is +also useful on platforms which support precompiled headers such +as all major compilers on the Windows platform and GCC on Unix platforms. + +@code +// +// file name: hworld.cpp +// +// purpose: wxWidgets "Hello world" +// + +// For compilers that support precompilation, includes "wx/wx.h". +#include "wx/wxprec.h" + +#ifdef __BORLANDC__ + #pragma hdrstop +#endif + +#ifndef WX_PRECOMP + #include "wx/wx.h" +#endif +@endcode + +Practically every app should define a new class derived from wxApp. +By overriding wxApp's OnInit() the program can be initialized, +e.g. by creating a new main window. + +@code +class MyApp: public wxApp +{ + virtual bool OnInit(); +}; +@endcode + +The main window is created by deriving a class from wxFrame and +giving it a menu and a status bar in its constructor. Also, any class +that wishes to respond to any "event" (such as mouse clicks or +messages from the menu or a button) must declare an event table +using the macro below. + +Finally, the way to react to such events must be done in "handlers". +In our sample, we react to two menu items, one for "Quit" and one for +displaying an "About" window. These handlers should not be virtual. + +@code +class MyFrame: public wxFrame +{ +public: + MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size); + + void OnQuit(wxCommandEvent& event); + void OnAbout(wxCommandEvent& event); + +private: + DECLARE_EVENT_TABLE() +}; +@endcode + +In order to be able to react to a menu command, it must be given a unique +identifier such as a const or an enum. + +@code +enum +{ + ID_Quit = 1, + ID_About, +}; +@endcode + +We then proceed to actually implement an event table in which the events +are routed to their respective handler functions in the class MyFrame. + +There are predefined macros for routing all common events, ranging from +the selection of a list box entry to a resize event when a user resizes +a window on the screen. If -1 is given as the ID, the given handler will be +invoked for any event of the specified type, so that you could add just +one entry in the event table for all menu commands or all button commands etc. + +The origin of the event can still be distinguished in the event handler as +the (only) parameter in an event handler is a reference to a wxEvent object, +which holds various information about the event (such as the ID of and a +pointer to the class, which emitted the event). + +@code +BEGIN_EVENT_TABLE(MyFrame, wxFrame) + EVT_MENU(ID_Quit, MyFrame::OnQuit) + EVT_MENU(ID_About, MyFrame::OnAbout) +END_EVENT_TABLE() +@endcode + +As in all programs there must be a "main" function. Under wxWidgets main is implemented +using this macro, which creates an application instance and starts the program. + +@code +IMPLEMENT_APP(MyApp) +@endcode + +As mentioned above, wxApp::OnInit() is called upon startup and should be +used to initialize the program, maybe showing a "splash screen" and creating +the main window (or several). The frame should get a title bar text ("Hello World") +and a position and start-up size. One frame can also be declared to be the +top window. Returning @true indicates a successful initialization. + +@code +bool MyApp::OnInit() +{ + MyFrame *frame = new MyFrame( "Hello World", wxPoint(50,50), wxSize(450,340) ); + frame->Show( true ); + SetTopWindow( frame ); + return true; +} +@endcode + +In the constructor of the main window (or later on) we create a menu with two menu +items as well as a status bar to be shown at the bottom of the main window. Both have +to be "announced" to the frame with respective calls. + +@code +MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size) : wxFrame((wxFrame *)NULL, -1, title, pos, size) - { - wxMenu *menuFile = new wxMenu; - - menuFile->Append( ID_About, "" ); - menuFile->AppendSeparator(); - menuFile->Append( ID_Quit, "E" ); - - wxMenuBar *menuBar = new wxMenuBar; - menuBar->Append( menuFile, "" ); - - SetMenuBar( menuBar ); - - CreateStatusBar(); - SetStatusText( "Welcome to wxWidgets!" ); - } - @endcode - - Here are the actual event handlers. MyFrame::OnQuit() closes the main window - by calling Close(). The parameter @true indicates that other windows have no veto - power such as after asking "Do you really want to close?". If there is no other - main window left, the application will quit. - - @code - void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) - { - Close( true ); - } - @endcode - - MyFrame::OnAbout() will display a small window with some text in it. In this - case a typical "About" window with information about the program. - - @code - void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) - { - wxMessageBox( "This is a wxWidgets' Hello world sample", - "About Hello World", wxOK | wxICON_INFORMATION ); - } - @endcode +{ + wxMenu *menuFile = new wxMenu; + + menuFile->Append( ID_About, "" ); + menuFile->AppendSeparator(); + menuFile->Append( ID_Quit, "E" ); + + wxMenuBar *menuBar = new wxMenuBar; + menuBar->Append( menuFile, "" ); + + SetMenuBar( menuBar ); + + CreateStatusBar(); + SetStatusText( "Welcome to wxWidgets!" ); +} +@endcode + +Here are the actual event handlers. MyFrame::OnQuit() closes the main window +by calling Close(). The parameter @true indicates that other windows have no veto +power such as after asking "Do you really want to close?". If there is no other +main window left, the application will quit. + +@code +void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event)) +{ + Close( true ); +} +@endcode + +MyFrame::OnAbout() will display a small window with some text in it. In this +case a typical "About" window with information about the program. + +@code +void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event)) +{ + wxMessageBox( "This is a wxWidgets' Hello world sample", + "About Hello World", wxOK | wxICON_INFORMATION ); +} +@endcode */