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     static char buf[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     // NB: There's a terrible hack involved: we fill 'buf' with new data every
  68     //     time this method is called and return new wxMemoryInputStream pointing to it.
  69     //     This won't work as soon as there are 2+ myVFS files opened. Fortunately,
  70     //     this won't happen because wxHTML keeps only one "page" file opened at the
  71     //     time.
  72     str = new wxMemoryInputStream(buf, strlen(buf));
  73     f = new wxFSFile(str, location, "text/html", wxEmptyString, wxDateTime::Today());
  74
  75     return f;
  76 }
  77
  78
  79
  80 // ----------------------------------------------------------------------------
  81 // private classes
  82 // ----------------------------------------------------------------------------
  83
  84 // Define a new application type, each program should derive a class from wxApp
  85    class MyApp : public wxApp
  86    {
  87    public:
  88     // override base class virtuals
  89     // ----------------------------
  90
  91     // this one is called on application startup and is a good place for the app
  92     // initialization (doing it here and not in the ctor allows to have an error
  93     // return: if OnInit() returns false, the application terminates)
  94       virtual bool OnInit();
  95    };
  96
  97 // Define a new frame type: this is going to be our main frame
  98    class MyFrame : public wxFrame
  99    {
 100    public:
 101     // ctor(s)
 102       MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
 103
 104     // event handlers (these functions should _not_ be virtual)
 105       void OnQuit(wxCommandEvent& event);
 106       void OnAbout(wxCommandEvent& event);
 107       void OnBack(wxCommandEvent& event);
 108       void OnForward(wxCommandEvent& event);
 109
 110    private:
 111     // any class wishing to process wxWindows events must use this macro
 112     DECLARE_EVENT_TABLE()
 113    };
 114
 115 // ----------------------------------------------------------------------------
 116 // constants
 117 // ----------------------------------------------------------------------------
 118
 119 // IDs for the controls and the menu commands
 120    enum
 121    {
 122     // menu items
 123    Minimal_Quit = 1,
 124    Minimal_About,
 125    Minimal_Back,
 126    Minimal_Forward,
 127
 128     // controls start here (the numbers are, of course, arbitrary)
 129    Minimal_Text = 1000,
 130    };
 131
 132 // ----------------------------------------------------------------------------
 133 // event tables and other macros for wxWindows
 134 // ----------------------------------------------------------------------------
 135
 136 // the event tables connect the wxWindows events with the functions (event
 137 // handlers) which process them. It can be also done at run-time, but for the
 138 // simple menu events like this the static method is much simpler.
 139    BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 140    EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 141    EVT_MENU(Minimal_About, MyFrame::OnAbout)
 142    EVT_MENU(Minimal_Back, MyFrame::OnBack)
 143    EVT_MENU(Minimal_Forward, MyFrame::OnForward)
 144    END_EVENT_TABLE()
 145
 146    // Create a new application object: this macro will allow wxWindows to create
 147    // the application object during program execution (it's better than using a
 148    // static object for many reasons) and also declares the accessor function
 149    // wxGetApp() which will return the reference of the right type (i.e. MyApp and
 150    // not wxApp)
 151    IMPLEMENT_APP(MyApp)
 152
 153    // ============================================================================
 154    // implementation
 155    // ============================================================================
 156
 157    // ----------------------------------------------------------------------------
 158    // the application class
 159    // ----------------------------------------------------------------------------
 160
 161    // `Main program' equivalent: the program execution "starts" here
 162    bool MyApp::OnInit()
 163    {
 164     // Create the main application window
 165       MyFrame *frame = new MyFrame("wxHtmlWindow testing application",
 166          wxPoint(50, 50), wxSize(640, 480));
 167
 168     // Show it and tell the application that it's our main window
 169     // @@@ what does it do exactly, in fact? is it necessary here?
 170       frame->Show(TRUE);
 171       SetTopWindow(frame);
 172       wxFileSystem::AddHandler(new MyVFS);
 173
 174     // success: wxApp::OnRun() will be called which will enter the main message
 175     // loop and the application will run. If we returned FALSE here, the
 176     // application would exit immediately.
 177       return TRUE;
 178    }
 179
 180 // ----------------------------------------------------------------------------
 181 // main frame
 182 // ----------------------------------------------------------------------------
 183
 184 wxHtmlWindow *html;
 185
 186 // frame constructor
 187    MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 188    : wxFrame((wxFrame *)NULL, -1, title, pos, size)
 189    {
 190     // create a menu bar
 191       wxMenu *menuFile = new wxMenu;
 192       wxMenu *menuNav = new wxMenu;
 193
 194       menuFile->Append(Minimal_Quit, "E&xit");
 195       menuNav->Append(Minimal_Back, "Go &BACK");
 196       menuNav->Append(Minimal_Forward, "Go &FORWARD");
 197
 198     // now append the freshly created menu to the menu bar...
 199       wxMenuBar *menuBar = new wxMenuBar;
 200       menuBar->Append(menuFile, "&File");
 201       menuBar->Append(menuNav, "&Navigate");
 202
 203     // ... and attach this menu bar to the frame
 204       SetMenuBar(menuBar);
 205
 206       CreateStatusBar(2);
 207
 208       html = new wxHtmlWindow(this);
 209       html -> SetRelatedFrame(this, "VFS Demo: '%s'");
 210       html -> SetRelatedStatusBar(1);
 211       html -> LoadPage("start.htm");
 212    }
 213
 214
 215 // event handlers
 216
 217    void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 218    {
 219     // TRUE is to force the frame to close
 220       Close(TRUE);
 221    }
 222
 223    void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
 224    {
 225    }
 226
 227
 228
 229    void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
 230    {
 231    if (!html -> HistoryBack()) wxMessageBox("You reached prehistory era!");
 232    }
 233
 234
 235    void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
 236    {
 237    if (!html -> HistoryForward()) wxMessageBox("No more items in history!");
 238    }