samples/html/virtual/virtual.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        virtual.cpp
   3 // Purpose:     wxHtml sample: demonstrates virtual file systems feature
   4 // Author:      ?
   5 // Modified by:
   6 // Created:     ?
   7 // Copyright:   (c) wxWidgets team
   8 // Licence:     wxWindows licence
   9 /////////////////////////////////////////////////////////////////////////////
  10
  11 // For compilers that support precompilation, includes "wx/wx.h".
  12 #include "wx/wxprec.h"
  13
  14 #ifdef __BORLANDC__
  15     #pragma hdrstop
  16 #endif
  17
  18 // for all others, include the necessary headers (this file is usually all you
  19 // need because it includes almost all "standard" wxWidgets headers
  20 #ifndef WX_PRECOMP
  21     #include "wx/wx.h"
  22 #endif
  23
  24 #include "wx/html/htmlwin.h"
  25
  26 #ifndef wxHAS_IMAGES_IN_RESOURCES
  27     #include "../../sample.xpm"
  28 #endif
  29
  30 // new handler class:
  31
  32 #include "wx/wfstream.h"
  33 #include "wx/mstream.h"
  34
  35
  36 // ----------------------------------------------------------------------------
  37 // MyVFS
  38 // ----------------------------------------------------------------------------
  39
  40 class MyVFS : public wxFileSystemHandler
  41 {
  42 public:
  43     MyVFS() : wxFileSystemHandler() {}
  44
  45     wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
  46     bool CanOpen(const wxString& location);
  47 };
  48
  49 bool MyVFS::CanOpen(const wxString& location)
  50 {
  51     return (GetProtocol(location) == wxT("myVFS"));
  52 }
  53
  54 wxFSFile* MyVFS::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
  55 {
  56     wxFSFile *f;
  57     wxInputStream *str;
  58     static char buf[1024];
  59     const wxWX2MBbuf loc = location.ToAscii();
  60
  61     sprintf(buf, "<html><body><h2><i>You're in Node <u>%s</u></i></h2><p>"
  62                 "Where do you want to go?<br><blockquote>"
  63                 "<a href=\"%s-1\">sub-1</a><br>"
  64                 "<a href=\"%s-2\">sub-2</a><br>"
  65                 "<a href=\"%s-3\">sub-3</a><br>"
  66                 "</blockquote></body></html>",
  67                 (const char*)loc, (const char*)loc, (const char*)loc,
  68                 (const char*)loc);
  69
  70     // NB: There's a terrible hack involved: we fill 'buf' with new data every
  71     //     time this method is called and return new wxMemoryInputStream pointing to it.
  72     //     This won't work as soon as there are 2+ myVFS files opened. Fortunately,
  73     //     this won't happen because wxHTML keeps only one "page" file opened at the
  74     //     time.
  75     str = new wxMemoryInputStream(buf, strlen(buf));
  76     f = new wxFSFile(str, location, wxT("text/html"), wxEmptyString, wxDateTime::Today());
  77
  78     return f;
  79 }
  80
  81
  82
  83 // ----------------------------------------------------------------------------
  84 // private classes
  85 // ----------------------------------------------------------------------------
  86
  87 // Define a new application type, each program should derive a class from wxApp
  88 class MyApp : public wxApp
  89 {
  90 public:
  91     // override base class virtuals
  92     // ----------------------------
  93
  94     // this one is called on application startup and is a good place for the app
  95     // initialization (doing it here and not in the ctor allows to have an error
  96     // return: if OnInit() returns false, the application terminates)
  97     virtual bool OnInit();
  98 };
  99
 100 // Define a new frame type: this is going to be our main frame
 101 class MyFrame : public wxFrame
 102 {
 103 public:
 104     // ctor(s)
 105     MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
 106
 107     // event handlers (these functions should _not_ be virtual)
 108     void OnQuit(wxCommandEvent& event);
 109     void OnBack(wxCommandEvent& event);
 110     void OnForward(wxCommandEvent& event);
 111
 112 private:
 113     // any class wishing to process wxWidgets events must use this macro
 114     DECLARE_EVENT_TABLE()
 115 };
 116
 117 // ----------------------------------------------------------------------------
 118 // constants
 119 // ----------------------------------------------------------------------------
 120
 121 // IDs for the controls and the menu commands
 122 enum
 123 {
 124         // menu items
 125     Minimal_Quit = 1,
 126     Minimal_Back,
 127     Minimal_Forward,
 128
 129         // controls start here (the numbers are, of course, arbitrary)
 130     Minimal_Text = 1000
 131 };
 132
 133 // ----------------------------------------------------------------------------
 134 // event tables and other macros for wxWidgets
 135 // ----------------------------------------------------------------------------
 136
 137 // the event tables connect the wxWidgets events with the functions (event
 138 // handlers) which process them. It can be also done at run-time, but for the
 139 // simple menu events like this the static method is much simpler.
 140 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
 141     EVT_MENU(Minimal_Quit,  MyFrame::OnQuit)
 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 wxWidgets 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     if ( !wxApp::OnInit() )
 165         return false;
 166
 167     // Create the main application window
 168     MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"),
 169         wxDefaultPosition, wxSize(640, 480));
 170
 171     // Show it
 172     frame->Show(true);
 173
 174     wxFileSystem::AddHandler(new MyVFS);
 175
 176     // success: wxApp::OnRun() will be called which will enter the main message
 177     // loop and the application will run. If we returned false here, the
 178     // application would exit immediately.
 179     return true;
 180 }
 181
 182 // ----------------------------------------------------------------------------
 183 // main frame
 184 // ----------------------------------------------------------------------------
 185
 186 wxHtmlWindow *html;
 187
 188 // frame constructor
 189 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
 190     : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
 191 {
 192     SetIcon(wxICON(sample));
 193
 194     // create a menu bar
 195     wxMenu *menuFile = new wxMenu;
 196     wxMenu *menuNav = new wxMenu;
 197
 198     menuFile->Append(Minimal_Quit, _("E&xit"));
 199     menuNav->Append(Minimal_Back, _("Go &BACK"));
 200     menuNav->Append(Minimal_Forward, _("Go &FORWARD"));
 201
 202     // now append the freshly created menu to the menu bar...
 203     wxMenuBar *menuBar = new wxMenuBar;
 204     menuBar->Append(menuFile, _("&File"));
 205     menuBar->Append(menuNav, _("&Navigate"));
 206
 207     // ... and attach this menu bar to the frame
 208     SetMenuBar(menuBar);
 209
 210 #if wxUSE_STATUSBAR
 211     CreateStatusBar(2);
 212 #endif // wxUSE_STATUSBAR
 213
 214     html = new wxHtmlWindow(this);
 215     html -> SetRelatedFrame(this, _("VFS Demo: '%s'"));
 216 #if wxUSE_STATUSBAR
 217     html -> SetRelatedStatusBar(1);
 218 #endif // wxUSE_STATUSBAR
 219     html -> LoadPage(wxT("start.htm"));
 220 }
 221
 222
 223 // event handlers
 224
 225 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
 226 {
 227     // true is to force the frame to close
 228     Close(true);
 229 }
 230
 231 void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
 232 {
 233     if (!html -> HistoryBack()) wxMessageBox(_("You reached prehistory era!"));
 234 }
 235
 236 void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
 237 {
 238     if (!html -> HistoryForward()) wxMessageBox(_("No more items in history!"));
 239 }