wxWidgets/samples/html/about/about.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        test.cpp
// Purpose:     wxHtml testing example
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWidgets headers
#ifndef WX_PRECOMP
    #include "wx/wx.h"
#endif

#include "wx/image.h"
#include "wx/imagpng.h"
#include "wx/wxhtml.h"
#include "wx/statline.h"

// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------


// Define a new application type, each program should derive a class from wxApp
   class MyApp : public wxApp
   {
   public:
    // override base class virtuals
    // ----------------------------

    // this one is called on application startup and is a good place for the app
    // initialization (doing it here and not in the ctor allows to have an error
    // return: if OnInit() returns false, the application terminates)
      virtual bool OnInit();
   };

// Define a new frame type: this is going to be our main frame
   class MyFrame : public wxFrame
   {
   public:
    // ctor(s)
      MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);

    // event handlers (these functions should _not_ be virtual)
      void OnQuit(wxCommandEvent& event);
      void OnAbout(wxCommandEvent& event);

   private:
    // any class wishing to process wxWidgets events must use this macro
    DECLARE_EVENT_TABLE()
   };

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

// IDs for the controls and the menu commands
   enum
   {
    // menu items
   Minimal_Quit = 1,
   Minimal_About,
   Minimal_Back,
   Minimal_Forward,

    // controls start here (the numbers are, of course, arbitrary)
   Minimal_Text = 1000
   };

// ----------------------------------------------------------------------------
// event tables and other macros for wxWidgets
// ----------------------------------------------------------------------------

// the event tables connect the wxWidgets events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
   BEGIN_EVENT_TABLE(MyFrame, wxFrame)
   EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
   EVT_MENU(Minimal_About, MyFrame::OnAbout)
   END_EVENT_TABLE()

   // Create a new application object: this macro will allow wxWidgets to create
   // the application object during program execution (it's better than using a
   // static object for many reasons) and also declares the accessor function
   // wxGetApp() which will return the reference of the right type (i.e. MyApp and
   // not wxApp)
   IMPLEMENT_APP(MyApp)

   // ============================================================================
   // implementation
   // ============================================================================

   // ----------------------------------------------------------------------------
   // the application class
   // ----------------------------------------------------------------------------
   // `Main program' equivalent: the program execution "starts" here
   bool MyApp::OnInit()
   {
    wxImage::AddHandler(new wxPNGHandler);
    // Create the main application window
      MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"),
         wxDefaultPosition, wxDefaultSize);

    // Show it and tell the application that it's our main window
    // @@@ what does it do exactly, in fact? is it necessary here?
      frame->Show(true);
      SetTopWindow(frame);


    // success: wxApp::OnRun() will be called which will enter the main message
    // loop and the application will run. If we returned false here, the
    // application would exit immediately.
      return true;
   }

// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------


// frame constructor
   MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
   : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
   {
    // create a menu bar
      wxMenu *menuFile = new wxMenu;

      menuFile->Append(Minimal_About, _("&About"));
      menuFile->Append(Minimal_Quit, _("E&xit"));

    // now append the freshly created menu to the menu bar...
      wxMenuBar *menuBar = new wxMenuBar;
      menuBar->Append(menuFile, _("&File"));

    // ... and attach this menu bar to the frame
      SetMenuBar(menuBar);
   }


// event handlers

   void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
   {
    // true is to force the frame to close
      Close(true);
   }

   void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
   {
        wxBoxSizer *topsizer;
        wxHtmlWindow *html;
        wxDialog dlg(this, wxID_ANY, wxString(_("About")));

        topsizer = new wxBoxSizer(wxVERTICAL);

        html = new wxHtmlWindow(&dlg, wxID_ANY, wxDefaultPosition, wxSize(380, 160), wxHW_SCROLLBAR_NEVER);
        html -> SetBorders(0);
        html -> LoadPage(wxT("data/about.htm"));
        html -> SetSize(html -> GetInternalRepresentation() -> GetWidth(),
                        html -> GetInternalRepresentation() -> GetHeight());

        topsizer -> Add(html, 1, wxALL, 10);

#if wxUSE_STATLINE
        topsizer -> Add(new wxStaticLine(&dlg, wxID_ANY), 0, wxEXPAND | wxLEFT | wxRIGHT, 10);
#endif // wxUSE_STATLINE

        wxButton *bu1 = new wxButton(&dlg, wxID_OK, _("OK"));
        bu1 -> SetDefault();

        topsizer -> Add(bu1, 0, wxALL | wxALIGN_RIGHT, 15);

        dlg.SetSizer(topsizer);
        topsizer -> Fit(&dlg);

        dlg.ShowModal();
    }