samples/html/virtual/virtual.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        virtua;.cpp
   3 // Purpose:     wxHtml testing example
   4 //              demonstrates virtual file systems feature
   5 /////////////////////////////////////////////////////////////////////////////
   6
   7 #ifdef __GNUG__
   8     #pragma implementation "test.cpp"
   9     #pragma interface "test.cpp"
  10 #endif
  11
  12 // For compilers that support precompilation, includes "wx/wx.h".
  13 #include <wx/wxprec.h>
  14
  15 #ifdef __BORLANDC__
  16     #pragma hdrstop
  17 #endif
  18
  19 // for all others, include the necessary headers (this file is usually all you
  20 // need because it includes almost all "standard" wxWindows headers
  21 #ifndef WX_PRECOMP
  22     #include <wx/wx.h>
  23 #endif
  24
  25
  26 #include <wx/html/htmlwin.h>
  27
  28
  29 // new handler class:
  30
  31 #include <wx/wfstream.h>
  32 #include <wx/mstream.h>
  33
  34
  35
  36 class MyVFS : public wxFileSystemHandler
  37 {
  38 public:
  39     MyVFS() : wxFileSystemHandler() {}
  40
  41     wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
  42     bool CanOpen(const wxString& location);
  43 };
  44
  45
  46 bool MyVFS::CanOpen(const wxString& location)
  47 {
  48     return (GetProtocol(location) == "myVFS");
  49 }
  50
  51
  52
  53 wxFSFile* MyVFS::OpenFile(wxFileSystem& fs, const wxString& location)
  54 {
  55     wxFSFile *f;
  56     wxInputStream *str;
  57     char *buf = (char*)malloc(1024);
  58
  59     sprintf(buf, "<html><body><h2><i>You're in Node <u>%s</u></i></h2><p>"
  60                  "Where do you want to go?<br><blockquote>"
  61                  "<a href=\"%s-1\">sub-1</a><br>"
  62                  "<a href=\"%s-2\">sub-2</a><br>"
  63                  "<a href=\"%s-3\">sub-3</a><br>"
  64                  "</blockquote></body></html>",
  65                  location.GetData(), location.GetData(), location.GetData(), location.GetData());
  66
  67     // WARNING: wxMemoryInputStream will not free buf.
  68     // There is a memory leak here.
  69     str = new wxMemoryInputStream(buf, strlen(buf));
  70     f = new wxFSFile(str, location, "text/html", wxEmptyString);
  71     return f;
  72 }
  73
  74
  75
  76 // ----------------------------------------------------------------------------
  77 // private classes
  78 // ----------------------------------------------------------------------------
  79
  80 // Define a new application type, each program should derive a class from wxApp
  81    class MyApp : public wxApp
  82    {
  83    public:
  84     // override base class virtuals
  85     // ----------------------------
  86
  87     // this one is called on application startup and is a good place for the app
  88     // initialization (doing it here and not in the ctor allows to have an error
  89     // return: if OnInit() returns false, the application terminates)
  90       virtual bool OnInit();
  91    };
  92
  93 // Define a new frame type: this is going to be our main frame
  94    class MyFrame : public wxFrame
  95    {
  96    public:
  97     // ctor(s)
  98       MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
  99
 100     // event handlers (these functions should _not_ be virtual)
 101       void OnQuit(wxCommandEvent& event);
 102       void OnAbout(wxCommandEvent& event);
 103       void OnBack(wxCommandEvent& event);
 104       void OnForward(wxCommandEvent& event);
 105
 106    private:
 107     // any class wishing to process wxWindows events must use this macro
 108     DECLARE_EVENT_TABLE()
 109    };
 110
 111 // ----------------------------------------------------------------------------
 112 // constants
 113 // ----------------------------------------------------------------------------
 114
 115 // IDs for the controls and the menu commands
 116    enum
 117    {
 118     // menu items
 119    Minimal_Quit = 1,
 120    Minimal_About,
 121    Minimal_Back,
 122    Minimal_Forward,
 123
 124     // controls start here (the numbers are, of course, arbitrary)
 125    Minimal_Text = 1000,
 126    };
 127
 128 // ----------------------------------------------------------------------------
 129 // event tables and other macros for wxWindows
 130 // ----------------------------------------------------------------------------
 131
 132 // the event tables connect the wxWindows events with the functions (event
 133 // handlers) which process them. It can be also done at run-time, but for the
 134 // simple menu events like this the static method is much simpler.
 135    BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 136    EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 137    EVT_MENU(Minimal_About, MyFrame::OnAbout)
 138    EVT_MENU(Minimal_Back, MyFrame::OnBack)
 139    EVT_MENU(Minimal_Forward, MyFrame::OnForward)
 140    END_EVENT_TABLE()
 141
 142    // Create a new application object: this macro will allow wxWindows to create
 143    // the application object during program execution (it's better than using a
 144    // static object for many reasons) and also declares the accessor function
 145    // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 146    // not wxApp)
 147    IMPLEMENT_APP(MyApp)
 148
 149    // ============================================================================
 150    // implementation
 151    // ============================================================================
 152
 153    // ----------------------------------------------------------------------------
 154    // the application class
 155    // ----------------------------------------------------------------------------
 156
 157    // `Main program' equivalent: the program execution "starts" here
 158    bool MyApp::OnInit()
 159    {
 160     // Create the main application window
 161       MyFrame *frame = new MyFrame("wxHtmlWindow testing application",
 162          wxPoint(50, 50), wxSize(640, 480));
 163
 164     // Show it and tell the application that it's our main window
 165     // @@@ what does it do exactly, in fact? is it necessary here?
 166       frame->Show(TRUE);
 167       SetTopWindow(frame);
 168       wxFileSystem::AddHandler(new MyVFS);
 169
 170     // success: wxApp::OnRun() will be called which will enter the main message
 171     // loop and the application will run. If we returned FALSE here, the
 172     // application would exit immediately.
 173       return TRUE;
 174    }
 175
 176 // ----------------------------------------------------------------------------
 177 // main frame
 178 // ----------------------------------------------------------------------------
 179
 180 wxHtmlWindow *html;
 181
 182 // frame constructor
 183    MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 184    : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 185    {
 186     // create a menu bar
 187       wxMenu *menuFile = new wxMenu;
 188       wxMenu *menuNav = new wxMenu;
 189
 190       menuFile->Append(Minimal_Quit, "E&xit");
 191       menuNav->Append(Minimal_Back, "Go &BACK");
 192       menuNav->Append(Minimal_Forward, "Go &FORWARD");
 193
 194     // now append the freshly created menu to the menu bar...
 195       wxMenuBar *menuBar = new wxMenuBar;
 196       menuBar->Append(menuFile, "&File");
 197       menuBar->Append(menuNav, "&Navigate");
 198
 199     // ... and attach this menu bar to the frame
 200       SetMenuBar(menuBar);
 201
 202       CreateStatusBar(1);
 203
 204       html = new wxHtmlWindow(this);
 205       html -> SetRelatedFrame(this, "VFS Demo: '%s'");
 206       html -> SetRelatedStatusBar(1);
 207       html -> LoadPage("start.htm");
 208    }
 209
 210
 211 // event handlers
 212
 213    void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 214    {
 215     // TRUE is to force the frame to close
 216       Close(TRUE);
 217    }
 218
 219    void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 220    {
 221    }
 222
 223
 224
 225    void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
 226    {
 227    if (!html -> HistoryBack()) wxMessageBox("You reached prehistory era!");
 228    }
 229
 230
 231    void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
 232    {
 233    if (!html -> HistoryForward()) wxMessageBox("No more items in history!");
 234    }