don't crash on zero length string in DoDrawRotatedText

[wxWidgets.git] / src / msw / msgdlg.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        src/msw/msgdlg.cpp
// Purpose:     wxMessageDialog
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

// For compilers that support precompilation, includes "wx.h".
#include "wx/wxprec.h"

#ifdef __BORLANDC__
    #pragma hdrstop
#endif

#ifndef WX_PRECOMP
    #include "wx/app.h"
    #include "wx/utils.h"
    #include "wx/dialog.h"
    #include "wx/msgdlg.h"
#endif

#include "wx/msw/private.h"

// For MB_TASKMODAL
#ifdef __WXWINCE__
#include "wx/msw/wince/missing.h"
#endif

IMPLEMENT_CLASS(wxMessageDialog, wxDialog)

wxMessageDialog::wxMessageDialog(wxWindow *parent,
                                 const wxString& message,
                                 const wxString& caption,
                                 long style,
                                 const wxPoint& WXUNUSED(pos))
{
    m_caption = caption;
    m_message = message;
    m_parent = parent;
    SetMessageDialogStyle(style);
}

int wxMessageDialog::ShowModal()
{
    if ( !wxTheApp->GetTopWindow() )
    {
        // when the message box is shown from wxApp::OnInit() (i.e. before the
        // message loop is entered), this must be done or the next message box
        // will never be shown - just try putting 2 calls to wxMessageBox() in
        // OnInit() to see it
        while ( wxTheApp->Pending() )
            wxTheApp->Dispatch();
    }

    // use the top level window as parent if none specified
    if ( !m_parent )
        m_parent = FindSuitableParent();
    HWND hWnd = m_parent ? GetHwndOf(m_parent) : NULL;

    // translate wx style in MSW
    unsigned int msStyle = MB_OK;
    const long wxStyle = GetMessageDialogStyle();
    if (wxStyle & wxYES_NO)
    {
#if !(defined(__SMARTPHONE__) && defined(__WXWINCE__))
        if (wxStyle & wxCANCEL)
            msStyle = MB_YESNOCANCEL;
        else
#endif // !(__SMARTPHONE__ && __WXWINCE__)
            msStyle = MB_YESNO;

        if (wxStyle & wxNO_DEFAULT)
            msStyle |= MB_DEFBUTTON2;
    }

    if (wxStyle & wxOK)
    {
        if (wxStyle & wxCANCEL)
            msStyle = MB_OKCANCEL;
        else
            msStyle = MB_OK;
    }
    if (wxStyle & wxICON_EXCLAMATION)
        msStyle |= MB_ICONEXCLAMATION;
    else if (wxStyle & wxICON_HAND)
        msStyle |= MB_ICONHAND;
    else if (wxStyle & wxICON_INFORMATION)
        msStyle |= MB_ICONINFORMATION;
    else if (wxStyle & wxICON_QUESTION)
        msStyle |= MB_ICONQUESTION;

    if ( wxStyle & wxSTAY_ON_TOP )
        msStyle |= MB_TOPMOST;

    if (hWnd)
        msStyle |= MB_APPLMODAL;
    else
        msStyle |= MB_TASKMODAL;

    // do show the dialog
    int msAns = MessageBox(hWnd, m_message.c_str(), m_caption.c_str(), msStyle);
    int ans;
    switch (msAns)
    {
        default:
            wxFAIL_MSG(_T("unexpected ::MessageBox() return code"));
            // fall through

        case IDCANCEL:
            ans = wxID_CANCEL;
            break;
        case IDOK:
            ans = wxID_OK;
            break;
        case IDYES:
            ans = wxID_YES;
            break;
        case IDNO:
            ans = wxID_NO;
            break;
    }
    return ans;
}