004f400287
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@40587 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
231 lines
7.3 KiB
C++
231 lines
7.3 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: virtua;.cpp
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// Purpose: wxHtml testing example
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// demonstrates virtual file systems feature
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/////////////////////////////////////////////////////////////////////////////
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// For compilers that support precompilation, includes "wx/wx.h".
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#include "wx/wxprec.h"
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#ifdef __BORLANDC__
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#pragma hdrstop
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#endif
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// for all others, include the necessary headers (this file is usually all you
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// need because it includes almost all "standard" wxWidgets headers
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#ifndef WX_PRECOMP
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#include "wx/wx.h"
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#endif
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#include "wx/html/htmlwin.h"
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// new handler class:
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#include "wx/wfstream.h"
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#include "wx/mstream.h"
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class MyVFS : public wxFileSystemHandler
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{
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public:
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MyVFS() : wxFileSystemHandler() {}
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wxFSFile* OpenFile(wxFileSystem& fs, const wxString& location);
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bool CanOpen(const wxString& location);
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};
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bool MyVFS::CanOpen(const wxString& location)
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{
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return (GetProtocol(location) == wxT("myVFS"));
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}
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wxFSFile* MyVFS::OpenFile(wxFileSystem& WXUNUSED(fs), const wxString& location)
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{
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wxFSFile *f;
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wxInputStream *str;
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static char buf[1024];
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const wxWX2MBbuf loc = location.ToAscii();
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sprintf(buf, "<html><body><h2><i>You're in Node <u>%s</u></i></h2><p>"
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"Where do you want to go?<br><blockquote>"
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"<a href=\"%s-1\">sub-1</a><br>"
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"<a href=\"%s-2\">sub-2</a><br>"
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"<a href=\"%s-3\">sub-3</a><br>"
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"</blockquote></body></html>",
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(const char*)loc, (const char*)loc, (const char*)loc,
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(const char*)loc);
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// NB: There's a terrible hack involved: we fill 'buf' with new data every
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// time this method is called and return new wxMemoryInputStream pointing to it.
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// This won't work as soon as there are 2+ myVFS files opened. Fortunately,
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// this won't happen because wxHTML keeps only one "page" file opened at the
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// time.
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str = new wxMemoryInputStream(buf, strlen(buf));
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f = new wxFSFile(str, location, wxT("text/html"), wxEmptyString, wxDateTime::Today());
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return f;
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}
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// ----------------------------------------------------------------------------
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// private classes
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// ----------------------------------------------------------------------------
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// Define a new application type, each program should derive a class from wxApp
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class MyApp : public wxApp
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{
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public:
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// override base class virtuals
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// ----------------------------
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// this one is called on application startup and is a good place for the app
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// initialization (doing it here and not in the ctor allows to have an error
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// return: if OnInit() returns false, the application terminates)
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virtual bool OnInit();
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};
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// Define a new frame type: this is going to be our main frame
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class MyFrame : public wxFrame
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{
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public:
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// ctor(s)
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MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
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// event handlers (these functions should _not_ be virtual)
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void OnQuit(wxCommandEvent& event);
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void OnBack(wxCommandEvent& event);
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void OnForward(wxCommandEvent& event);
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private:
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// any class wishing to process wxWidgets events must use this macro
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DECLARE_EVENT_TABLE()
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};
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// ----------------------------------------------------------------------------
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// constants
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// ----------------------------------------------------------------------------
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// IDs for the controls and the menu commands
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enum
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{
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// menu items
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Minimal_Quit = 1,
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Minimal_Back,
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Minimal_Forward,
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// controls start here (the numbers are, of course, arbitrary)
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Minimal_Text = 1000
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};
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// ----------------------------------------------------------------------------
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// event tables and other macros for wxWidgets
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// ----------------------------------------------------------------------------
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// the event tables connect the wxWidgets events with the functions (event
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// handlers) which process them. It can be also done at run-time, but for the
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// simple menu events like this the static method is much simpler.
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BEGIN_EVENT_TABLE(MyFrame, wxFrame)
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EVT_MENU(Minimal_Quit, MyFrame::OnQuit)
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EVT_MENU(Minimal_Back, MyFrame::OnBack)
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EVT_MENU(Minimal_Forward, MyFrame::OnForward)
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END_EVENT_TABLE()
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// Create a new application object: this macro will allow wxWidgets to create
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// the application object during program execution (it's better than using a
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// static object for many reasons) and also declares the accessor function
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// wxGetApp() which will return the reference of the right type (i.e. MyApp and
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// not wxApp)
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IMPLEMENT_APP(MyApp)
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// ============================================================================
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// implementation
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// ============================================================================
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// ----------------------------------------------------------------------------
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// the application class
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// ----------------------------------------------------------------------------
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// `Main program' equivalent: the program execution "starts" here
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bool MyApp::OnInit()
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{
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// Create the main application window
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MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"),
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wxDefaultPosition, wxSize(640, 480));
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// Show it and tell the application that it's our main window
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// @@@ what does it do exactly, in fact? is it necessary here?
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frame->Show(true);
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SetTopWindow(frame);
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wxFileSystem::AddHandler(new MyVFS);
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// success: wxApp::OnRun() will be called which will enter the main message
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// loop and the application will run. If we returned false here, the
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// application would exit immediately.
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return true;
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}
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// ----------------------------------------------------------------------------
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// main frame
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// ----------------------------------------------------------------------------
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wxHtmlWindow *html;
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// frame constructor
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MyFrame::MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size)
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: wxFrame((wxFrame *)NULL, wxID_ANY, title, pos, size)
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{
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// create a menu bar
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wxMenu *menuFile = new wxMenu;
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wxMenu *menuNav = new wxMenu;
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menuFile->Append(Minimal_Quit, _("E&xit"));
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menuNav->Append(Minimal_Back, _("Go &BACK"));
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menuNav->Append(Minimal_Forward, _("Go &FORWARD"));
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// now append the freshly created menu to the menu bar...
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wxMenuBar *menuBar = new wxMenuBar;
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menuBar->Append(menuFile, _("&File"));
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menuBar->Append(menuNav, _("&Navigate"));
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// ... and attach this menu bar to the frame
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SetMenuBar(menuBar);
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#if wxUSE_STATUSBAR
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CreateStatusBar(2);
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#endif // wxUSE_STATUSBAR
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html = new wxHtmlWindow(this);
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html -> SetRelatedFrame(this, _("VFS Demo: '%s'"));
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#if wxUSE_STATUSBAR
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html -> SetRelatedStatusBar(1);
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#endif // wxUSE_STATUSBAR
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html -> LoadPage(wxT("start.htm"));
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}
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// event handlers
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void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
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{
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// true is to force the frame to close
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Close(true);
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}
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void MyFrame::OnBack(wxCommandEvent& WXUNUSED(event))
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{
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if (!html -> HistoryBack()) wxMessageBox(_("You reached prehistory era!"));
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}
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void MyFrame::OnForward(wxCommandEvent& WXUNUSED(event))
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{
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if (!html -> HistoryForward()) wxMessageBox(_("No more items in history!"));
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}
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