4f4c5fcfdf
This is a combination of running clang-tidy with modernize-use-nullptr check for some ports (GTK, X11, OSX) and manual changes to the ports for which it couldn't be used easily (MSW, DFB) and also manually updating the docs. Also replace NULL with null or nullptr in the comments as this is more consistent with the use of nullptr in the code and makes it simpler to grep for the remaining occurrences of NULL itself. And also use null in the assert messages. Only a few occurrences of "NULL" are still left in non-C files, mostly corresponding to unclear comments or string output which it might not be safe to change.
236 lines
7.4 KiB
C++
236 lines
7.4 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: virtual.cpp
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// Purpose: wxHtml sample: demonstrates virtual file systems feature
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// Author: ?
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// Modified by:
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// Created: ?
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// Copyright: (c) wxWidgets team
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// Licence: wxWindows licence
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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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// 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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#ifndef wxHAS_IMAGES_IN_RESOURCES
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#include "../../sample.xpm"
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#endif
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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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// ----------------------------------------------------------------------------
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// MyVFS
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// ----------------------------------------------------------------------------
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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) override;
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bool CanOpen(const wxString& location) override;
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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) == "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, "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() override;
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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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wxDECLARE_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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wxBEGIN_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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wxEND_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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wxIMPLEMENT_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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if ( !wxApp::OnInit() )
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return false;
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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
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frame->Show(true);
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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(nullptr, wxID_ANY, title, pos, size)
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{
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SetIcon(wxICON(sample));
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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("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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