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/////////////////////////////////////////////////////////////////////////////
// Name: virtual.cpp
// Purpose: wxHtml sample: demonstrates virtual file systems feature
// Author: ?
// Modified by:
// Created: ?
// Copyright: (c) wxWidgets team
// Licence: wxWindows licence
/////////////////////////////////////////////////////////////////////////////
// For compilers that support precompilation, includes "wx/wx.h".
#include "wx/wxprec.h"
#ifdef __BORLANDC__
#pragma hdrstop
#endif
// for all others, include the necessary headers (this file is usually all you
// need because it includes almost all "standard" wxWidgets headers
#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#include "wx/html/htmlwin.h"
#ifndef wxHAS_IMAGES_IN_RESOURCES
#include "../../sample.xpm"
#endif
// new handler class:
#include "wx/wfstream.h"
#include "wx/mstream.h"
// ----------------------------------------------------------------------------
// MyVFS
// ----------------------------------------------------------------------------
class MyVFS : public wxFileSystemHandler
{
public:
MyVFS() : wxFileSystemHandler() {}
wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
bool CanOpen(const wxString& location);
};
bool MyVFS::CanOpen(const wxString& location)
{
return (GetProtocol(location) == wxT("myVFS"));
}
wxFSFile* MyVFS::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
{
wxFSFile *f;
wxInputStream *str;
static char buf[1024];
const wxWX2MBbuf loc = location.ToAscii();
sprintf(buf, "<html><body><h2><i>You're in Node <u>%s</u></i></h2><p>"
"Where do you want to go?<br><blockquote>"
"<a href=\"%s-1\">sub-1</a><br>"
"<a href=\"%s-2\">sub-2</a><br>"
"<a href=\"%s-3\">sub-3</a><br>"
"</blockquote></body></html>",
(const char*)loc, (const char*)loc, (const char*)loc,
(const char*)loc);
// NB: There's a terrible hack involved: we fill 'buf' with new data every
// time this method is called and return new wxMemoryInputStream pointing to it.
// This won't work as soon as there are 2+ myVFS files opened. Fortunately,
// this won't happen because wxHTML keeps only one "page" file opened at the
// time.
str = new wxMemoryInputStream(buf, strlen(buf));
f = new wxFSFile(str, location, wxT("text/html"), wxEmptyString, wxDateTime::Today());
return f;
}
// ----------------------------------------------------------------------------
// private classes
// ----------------------------------------------------------------------------
// Define a new application type, each program should derive a class from wxApp
class MyApp : public wxApp
{
public:
// override base class virtuals
// ----------------------------
// this one is called on application startup and is a good place for the app
// initialization (doing it here and not in the ctor allows to have an error
// return: if OnInit() returns false, the application terminates)
virtual bool OnInit();
};
// Define a new frame type: this is going to be our main frame
class MyFrame : public wxFrame
{
public:
// ctor(s)
MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
// event handlers (these functions should _not_ be virtual)
void OnQuit(wxCommandEvent& event);
void OnBack(wxCommandEvent& event);
void OnForward(wxCommandEvent& event);
private:
// any class wishing to process wxWidgets events must use this macro
wxDECLARE_EVENT_TABLE();
};
// ----------------------------------------------------------------------------
// constants
// ----------------------------------------------------------------------------
// IDs for the controls and the menu commands
enum
{
// menu items
Minimal_Quit = 1,
Minimal_Back,
Minimal_Forward,
// controls start here (the numbers are, of course, arbitrary)
Minimal_Text = 1000
};
// ----------------------------------------------------------------------------
// event tables and other macros for wxWidgets
// ----------------------------------------------------------------------------
// the event tables connect the wxWidgets events with the functions (event
// handlers) which process them. It can be also done at run-time, but for the
// simple menu events like this the static method is much simpler.
wxBEGIN_EVENT_TABLE(MyFrame, wxFrame)
EVT_MENU(Minimal_Quit, MyFrame::OnQuit)
EVT_MENU(Minimal_Back, MyFrame::OnBack)
EVT_MENU(Minimal_Forward, MyFrame::OnForward)
wxEND_EVENT_TABLE()
// Create a new application object: this macro will allow wxWidgets to create
// the application object during program execution (it's better than using a
// static object for many reasons) and also declares the accessor function
// wxGetApp() which will return the reference of the right type (i.e. MyApp and
// not wxApp)
IMPLEMENT_APP(MyApp)
// ============================================================================
// implementation
// ============================================================================
// ----------------------------------------------------------------------------
// the application class
// ----------------------------------------------------------------------------
// `Main program' equivalent: the program execution "starts" here
bool MyApp::OnInit()
{
if ( !wxApp::OnInit() )
return false;
// Create the main application window
MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"),
wxDefaultPosition, wxSize(640, 480));
// Show it
frame->Show(true);
wxFileSystem::AddHandler(new MyVFS);
// success: wxApp::OnRun() will be called which will enter the main message
// loop and the application will run. If we returned false here, the
// application would exit immediately.
return true;
}
// ----------------------------------------------------------------------------
// main frame
// ----------------------------------------------------------------------------
wxHtmlWindow *html;
// frame constructor
MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
: wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
{
SetIcon(wxICON(sample));
// create a menu bar
wxMenu *menuFile = new wxMenu;
wxMenu *menuNav = new wxMenu;
menuFile->Append(Minimal_Quit, _("E&xit"));
menuNav->Append(Minimal_Back, _("Go &BACK"));
menuNav->Append(Minimal_Forward, _("Go &FORWARD"));
// now append the freshly created menu to the menu bar...
wxMenuBar *menuBar = new wxMenuBar;
menuBar->Append(menuFile, _("&File"));
menuBar->Append(menuNav, _("&Navigate"));
// ... and attach this menu bar to the frame
SetMenuBar(menuBar);
#if wxUSE_STATUSBAR
CreateStatusBar(2);
#endif // wxUSE_STATUSBAR
html = new wxHtmlWindow(this);
html -> SetRelatedFrame(this, _("VFS Demo: '%s'"));
#if wxUSE_STATUSBAR
html -> SetRelatedStatusBar(1);
#endif // wxUSE_STATUSBAR
html -> LoadPage(wxT("start.htm"));
}
// event handlers
void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
// true is to force the frame to close
Close(true);
}
void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
{
if (!html -> HistoryBack()) wxMessageBox(_("You reached prehistory era!"));
}
void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
{
if (!html -> HistoryForward()) wxMessageBox(_("No more items in history!"));
}
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