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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 }