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1 /////////////////////////////////////////////////////////////////////////////
2 // Name: virtua;.cpp
3 // Purpose: wxHtml testing example
4 // demonstrates virtual file systems feature
5 /////////////////////////////////////////////////////////////////////////////
6
7 // For compilers that support precompilation, includes "wx/wx.h".
8 #include "wx/wxprec.h"
9
10 #ifdef __BORLANDC__
11 #pragma hdrstop
12 #endif
13
14 // for all others, include the necessary headers (this file is usually all you
15 // need because it includes almost all "standard" wxWidgets headers
16 #ifndef WX_PRECOMP
17 #include "wx/wx.h"
18 #endif
19
20
21 #include "wx/html/htmlwin.h"
22
23
24 // new handler class:
25
26 #include "wx/wfstream.h"
27 #include "wx/mstream.h"
28
29
30
31 class MyVFS : public wxFileSystemHandler
32 {
33 public:
34 MyVFS() : wxFileSystemHandler() {}
35
36 wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
37 bool CanOpen(const wxString& location);
38 };
39
40
41 bool MyVFS::CanOpen(const wxString& location)
42 {
43 return (GetProtocol(location) == wxT("myVFS"));
44 }
45
46
47
48 wxFSFile* MyVFS::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
49 {
50 wxFSFile *f;
51 wxInputStream *str;
52 static char buf[1024];
53 const wxWX2MBbuf loc = location.ToAscii();
54
55 sprintf(buf, "<html><body><h2><i>You're in Node <u>%s</u></i></h2><p>"
56 "Where do you want to go?<br><blockquote>"
57 "<a href=\"%s-1\">sub-1</a><br>"
58 "<a href=\"%s-2\">sub-2</a><br>"
59 "<a href=\"%s-3\">sub-3</a><br>"
60 "</blockquote></body></html>",
61 (const char*)loc, (const char*)loc, (const char*)loc,
62 (const char*)loc);
63
64 // NB: There's a terrible hack involved: we fill 'buf' with new data every
65 // time this method is called and return new wxMemoryInputStream pointing to it.
66 // This won't work as soon as there are 2+ myVFS files opened. Fortunately,
67 // this won't happen because wxHTML keeps only one "page" file opened at the
68 // time.
69 str = new wxMemoryInputStream(buf, strlen(buf));
70 f = new wxFSFile(str, location, wxT("text/html"), wxEmptyString, wxDateTime::Today());
71
72 return f;
73 }
74
75
76
77 // ----------------------------------------------------------------------------
78 // private classes
79 // ----------------------------------------------------------------------------
80
81 // Define a new application type, each program should derive a class from wxApp
82 class MyApp : public wxApp
83 {
84 public:
85 // override base class virtuals
86 // ----------------------------
87
88 // this one is called on application startup and is a good place for the app
89 // initialization (doing it here and not in the ctor allows to have an error
90 // return: if OnInit() returns false, the application terminates)
91 virtual bool OnInit();
92 };
93
94 // Define a new frame type: this is going to be our main frame
95 class MyFrame : public wxFrame
96 {
97 public:
98 // ctor(s)
99 MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
100
101 // event handlers (these functions should _not_ be virtual)
102 void OnQuit(wxCommandEvent& event);
103 void OnBack(wxCommandEvent& event);
104 void OnForward(wxCommandEvent& event);
105
106 private:
107 // any class wishing to process wxWidgets 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_Back,
121 Minimal_Forward,
122
123 // controls start here (the numbers are, of course, arbitrary)
124 Minimal_Text = 1000
125 };
126
127 // ----------------------------------------------------------------------------
128 // event tables and other macros for wxWidgets
129 // ----------------------------------------------------------------------------
130
131 // the event tables connect the wxWidgets events with the functions (event
132 // handlers) which process them. It can be also done at run-time, but for the
133 // simple menu events like this the static method is much simpler.
134 BEGIN_EVENT_TABLE(MyFrame, wxFrame)
135 EVT_MENU(Minimal_Quit, MyFrame::OnQuit)
136 EVT_MENU(Minimal_Back, MyFrame::OnBack)
137 EVT_MENU(Minimal_Forward, MyFrame::OnForward)
138 END_EVENT_TABLE()
139
140 // Create a new application object: this macro will allow wxWidgets to create
141 // the application object during program execution (it's better than using a
142 // static object for many reasons) and also declares the accessor function
143 // wxGetApp() which will return the reference of the right type (i.e. MyApp and
144 // not wxApp)
145 IMPLEMENT_APP(MyApp)
146
147 // ============================================================================
148 // implementation
149 // ============================================================================
150
151 // ----------------------------------------------------------------------------
152 // the application class
153 // ----------------------------------------------------------------------------
154
155 // `Main program' equivalent: the program execution "starts" here
156 bool MyApp::OnInit()
157 {
158 // Create the main application window
159 MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"),
160 wxDefaultPosition, wxSize(640, 480));
161
162 // Show it and tell the application that it's our main window
163 // @@@ what does it do exactly, in fact? is it necessary here?
164 frame->Show(true);
165 SetTopWindow(frame);
166 wxFileSystem::AddHandler(new MyVFS);
167
168 // success: wxApp::OnRun() will be called which will enter the main message
169 // loop and the application will run. If we returned false here, the
170 // application would exit immediately.
171 return true;
172 }
173
174 // ----------------------------------------------------------------------------
175 // main frame
176 // ----------------------------------------------------------------------------
177
178 wxHtmlWindow *html;
179
180 // frame constructor
181 MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
182 : wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
183 {
184 // create a menu bar
185 wxMenu *menuFile = new wxMenu;
186 wxMenu *menuNav = new wxMenu;
187
188 menuFile->Append(Minimal_Quit, _("E&xit"));
189 menuNav->Append(Minimal_Back, _("Go &BACK"));
190 menuNav->Append(Minimal_Forward, _("Go &FORWARD"));
191
192 // now append the freshly created menu to the menu bar...
193 wxMenuBar *menuBar = new wxMenuBar;
194 menuBar->Append(menuFile, _("&File"));
195 menuBar->Append(menuNav, _("&Navigate"));
196
197 // ... and attach this menu bar to the frame
198 SetMenuBar(menuBar);
199
200 #if wxUSE_STATUSBAR
201 CreateStatusBar(2);
202 #endif // wxUSE_STATUSBAR
203
204 html = new wxHtmlWindow(this);
205 html -> SetRelatedFrame(this, _("VFS Demo: '%s'"));
206 #if wxUSE_STATUSBAR
207 html -> SetRelatedStatusBar(1);
208 #endif // wxUSE_STATUSBAR
209 html -> LoadPage(wxT("start.htm"));
210 }
211
212
213 // event handlers
214
215 void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
216 {
217 // true is to force the frame to close
218 Close(true);
219 }
220
221 void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
222 {
223 if (!html -> HistoryBack()) wxMessageBox(_("You reached prehistory era!"));
224 }
225
226
227 void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
228 {
229 if (!html -> HistoryForward()) wxMessageBox(_("No more items in history!"));
230 }