📄 virtual.cpp
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/////////////////////////////////////////////////////////////////////////////// Name: virtua;.cpp// Purpose: wxHtml testing example// demonstrates virtual file systems feature/////////////////////////////////////////////////////////////////////////////// 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"// new handler class:#include "wx/wfstream.h"#include "wx/mstream.h"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 DECLARE_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. BEGIN_EVENT_TABLE(MyFrame, wxFrame) EVT_MENU(Minimal_Quit, MyFrame::OnQuit) EVT_MENU(Minimal_Back, MyFrame::OnBack) EVT_MENU(Minimal_Forward, MyFrame::OnForward) END_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() { // Create the main application window MyFrame *frame = new MyFrame(_("wxHtmlWindow testing application"), wxDefaultPosition, wxSize(640, 480)); // Show it and tell the application that it's our main window // @@@ what does it do exactly, in fact? is it necessary here? frame->Show(true); SetTopWindow(frame); 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) { // 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!")); }⌨️ 快捷键说明
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