printing.cpp

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

/////////////////////////////////////////////////////////////////////////////
// Name:        printimg.cpp
// Purpose:     wxHtmlEasyPrinting testing example
// 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/image.h"
#include "wx/html/htmlwin.h"
#include "wx/html/htmprint.h"


// ----------------------------------------------------------------------------
// 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 and dtor

        MyFrame(const wxString& title, const wxPoint& pos, const wxSize& size);
        virtual ~MyFrame();

        // event handlers (these functions should _not_ be virtual)
        void OnQuit(wxCommandEvent& event);
        void OnAbout(wxCommandEvent& event);

        void OnPageSetup(wxCommandEvent& event);
        void OnPrint(wxCommandEvent& event);
        void OnPreview(wxCommandEvent& event);
        void OnOpen(wxCommandEvent& event);
        
        void OnPrintSmall(wxCommandEvent& event);
        void OnPrintNormal(wxCommandEvent& event);
        void OnPrintHuge(wxCommandEvent& event);


    private:
        wxHtmlWindow *m_Html;
        wxHtmlEasyPrinting *m_Prn;
        wxString m_Name;
        // 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_Print,
    Minimal_Preview,
    Minimal_PageSetup,
    Minimal_Open,
    Minimal_PrintSmall,
    Minimal_PrintNormal,
    Minimal_PrintHuge

};

// ----------------------------------------------------------------------------
// 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(wxID_ABOUT, MyFrame::OnAbout)
    EVT_MENU(Minimal_Print, MyFrame::OnPrint)
    EVT_MENU(Minimal_Preview, MyFrame::OnPreview)
    EVT_MENU(Minimal_PageSetup, MyFrame::OnPageSetup)
    EVT_MENU(Minimal_Open, MyFrame::OnOpen)
    EVT_MENU(Minimal_PrintSmall, MyFrame::OnPrintSmall)
    EVT_MENU(Minimal_PrintNormal, MyFrame::OnPrintNormal)
    EVT_MENU(Minimal_PrintHuge, MyFrame::OnPrintHuge)
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()
{
#if wxUSE_LIBPNG
    wxImage::AddHandler(new wxPNGHandler);
#endif
#if wxUSE_LIBJPEG
    wxImage::AddHandler(new wxJPEGHandler);
#endif
#if wxUSE_GIF
    wxImage::AddHandler(new wxGIFHandler);
#endif

    MyFrame *frame = new MyFrame(_("Printing test"),
        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);


    // 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
// ----------------------------------------------------------------------------


// 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;
    menuFile->Append(Minimal_Open, _("Open...\tCtrl-O"));
    menuFile->AppendSeparator();
    menuFile->Append(Minimal_PageSetup, _("Page Setup"));
    menuFile->Append(Minimal_Print, _("Print..."));
    menuFile->Append(Minimal_Preview, _("Preview..."));
    menuFile->AppendSeparator();
    menuFile->Append(wxID_ABOUT, _("&About"));
    menuFile->AppendSeparator();
    menuFile->Append(Minimal_Quit, _("&Exit"));

    wxMenu *testFile = new wxMenu;
    testFile->Append(Minimal_PrintSmall, _("Small Printer Fonts"));
    testFile->Append(Minimal_PrintNormal, _("Normal Printer Fonts"));
    testFile->Append(Minimal_PrintHuge, _("Huge Printer Fonts"));
    
    // now append the freshly created menu to the menu bar...
    wxMenuBar *menuBar = new wxMenuBar;
    menuBar->Append(menuFile, _("&File"));
    menuBar->Append(testFile, _("&Test"));

    // ... and attach this menu bar to the frame
    SetMenuBar(menuBar);

#if wxUSE_STATUSBAR
    CreateStatusBar(1);
#endif // wxUSE_STATUSBAR

    m_Html = new wxHtmlWindow(this);
    m_Html -> SetRelatedFrame(this, _("HTML : %s"));
#if wxUSE_STATUSBAR
    m_Html -> SetRelatedStatusBar(0);
#endif // wxUSE_STATUSBAR
    m_Name = wxT("test.htm");
    m_Html -> LoadPage(m_Name);
    
    m_Prn = new wxHtmlEasyPrinting(_("Easy Printing Demo"), this);
    m_Prn -> SetHeader(m_Name + wxT("(@PAGENUM@/@PAGESCNT@)<hr>"), wxPAGE_ALL);

    // To specify where the AFM files are kept on Unix,
    // you may wish to do something like this
    // m_Prn->GetPrintData()->SetFontMetricPath(wxT("/home/julians/afm"));
}

// frame destructor
MyFrame::~MyFrame()
{
    delete m_Prn;
    m_Prn = (wxHtmlEasyPrinting *) NULL;
}


// event handlers

void MyFrame::OnQuit(wxCommandEvent& WXUNUSED(event))
{
    // true is to force the frame to close
    Close(true);
}


void MyFrame::OnAbout(wxCommandEvent& WXUNUSED(event))
{
    wxMessageBox(_("HTML printing sample\n\n(c) Vaclav Slavik, 1999"));
}


void MyFrame::OnPageSetup(wxCommandEvent& WXUNUSED(event))
{
    m_Prn -> PageSetup();
}


void MyFrame::OnPrint(wxCommandEvent& WXUNUSED(event))
{
    m_Prn -> PrintFile(m_Name);
}


void MyFrame::OnPreview(wxCommandEvent& WXUNUSED(event))
{
    m_Prn -> PreviewFile(m_Name);
}


void MyFrame::OnOpen(wxCommandEvent& WXUNUSED(event))
{
    wxFileDialog dialog(this, _("Open HTML page"), wxT(""), wxT(""), wxT("*.htm"), 0);

    if (dialog.ShowModal() == wxID_OK)
    {
        m_Name = dialog.GetPath();
        m_Html -> LoadPage(m_Name);
        m_Prn -> SetHeader(m_Name + wxT("(@PAGENUM@/@PAGESCNT@)<hr>"), wxPAGE_ALL);
    } 
}


void MyFrame::OnPrintSmall(wxCommandEvent& WXUNUSED(event))
{
    int fontsizes[] = { 4, 6, 8, 10, 12, 20, 24 }; 
    m_Prn->SetFonts(wxEmptyString, wxEmptyString, fontsizes);
}

void MyFrame::OnPrintNormal(wxCommandEvent& WXUNUSED(event))
{
    m_Prn->SetFonts(wxEmptyString, wxEmptyString, 0);
}

void MyFrame::OnPrintHuge(wxCommandEvent& WXUNUSED(event))
{
    int fontsizes[] = { 20, 26, 28, 30, 32, 40, 44 }; 
    m_Prn->SetFonts(wxEmptyString, wxEmptyString, fontsizes);
}