safe degradation

[wxWidgets.git] / src / osx / cocoa / msgdlg.mm

/////////////////////////////////////////////////////////////////////////////
// Name:        src/osx/cocoa/msgdlg.mm
// Purpose:     wxMessageDialog
// Author:      Stefan Csomor
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id: msgdlg.cpp 54129 2008-06-11 19:30:52Z SC $
// Copyright:   (c) Stefan Csomor
// Licence:     wxWindows licence
/////////////////////////////////////////////////////////////////////////////

#include "wx/wxprec.h"

#include "wx/msgdlg.h"

#ifndef WX_PRECOMP
    #include "wx/intl.h"
    #include "wx/app.h"
#endif

#include "wx/thread.h"
#include "wx/osx/private.h"


IMPLEMENT_CLASS(wxMessageDialog, wxDialog)


namespace 
{
    NSAlertStyle GetAlertStyleFromWXStyle( long style )
    {
        NSAlertStyle alertType = NSWarningAlertStyle;
        if (style & wxICON_EXCLAMATION)
            alertType = NSCriticalAlertStyle;
        else if (style & wxICON_HAND)
            alertType = NSWarningAlertStyle;
        else if (style & wxICON_INFORMATION)
            alertType = NSInformationalAlertStyle;
        else if (style & wxICON_QUESTION)
            alertType = NSInformationalAlertStyle;
        return alertType;
    }
}

wxMessageDialog::wxMessageDialog(wxWindow *parent,
                                 const wxString& message,
                                 const wxString& caption,
                                 long style,
                                 const wxPoint& WXUNUSED(pos))
               : wxMessageDialogWithCustomLabels(parent, message, caption, style)
{
}

int wxMessageDialog::ShowModal()
{
    int resultbutton = wxID_CANCEL;

    const long style = GetMessageDialogStyle();

    wxASSERT_MSG( (style & 0x3F) != wxYES, wxT("this style is not supported on Mac") );

    // work out what to display
    // if the extended text is empty then we use the caption as the title
    // and the message as the text (for backwards compatibility)
    // but if the extended message is not empty then we use the message as the title
    // and the extended message as the text because that makes more sense

    wxString msgtitle,msgtext;
    if(m_extendedMessage.IsEmpty())
    {
        msgtitle = m_caption;
        msgtext  = m_message;
    }
    else
    {
        msgtitle = m_message;
        msgtext  = m_extendedMessage;
    }


    if ( !wxIsMainThread() )
    {
        CFStringRef defaultButtonTitle = NULL;
        CFStringRef alternateButtonTitle = NULL;
        CFStringRef otherButtonTitle = NULL;

        wxCFStringRef cfTitle( msgtitle, GetFont().GetEncoding() );
        wxCFStringRef cfText( msgtext, GetFont().GetEncoding() );

        wxCFStringRef cfNoString( GetNoLabel(), GetFont().GetEncoding() );
        wxCFStringRef cfYesString( GetYesLabel(), GetFont().GetEncoding() );
        wxCFStringRef cfOKString( GetOKLabel(), GetFont().GetEncoding()) ;
        wxCFStringRef cfCancelString( GetCancelLabel(), GetFont().GetEncoding() );

        NSAlertStyle alertType = GetAlertStyleFromWXStyle(style);
                
        int m_buttonId[4] = { 0, 0, 0, wxID_CANCEL /* time-out */ };

        if (style & wxYES_NO)
        {
            if ( style & wxNO_DEFAULT )
            {
                defaultButtonTitle = cfNoString;
                alternateButtonTitle = cfYesString;
                m_buttonId[0] = wxID_NO;
                m_buttonId[1] = wxID_YES;
            }
            else
            {
                defaultButtonTitle = cfYesString;
                alternateButtonTitle = cfNoString;
                m_buttonId[0] = wxID_YES;
                m_buttonId[1] = wxID_NO;
            }
            if (style & wxCANCEL)
            {
                otherButtonTitle = cfCancelString;
                m_buttonId[2] = wxID_CANCEL;
            }
        }
        else
        {
            // the MSW implementation even shows an OK button if it is not specified, we'll do the same
            m_buttonId[0] = wxID_OK;
            // using null as default title does not work on earlier systems
            defaultButtonTitle = cfOKString;
            if (style & wxCANCEL)
            {
                alternateButtonTitle = cfCancelString;
                m_buttonId[1] = wxID_CANCEL;
            }
        }

        CFOptionFlags exitButton;
        OSStatus err = CFUserNotificationDisplayAlert(
            0, alertType, NULL, NULL, NULL, cfTitle, cfText,
            defaultButtonTitle, alternateButtonTitle, otherButtonTitle, &exitButton );
        if (err == noErr)
            resultbutton = m_buttonId[exitButton];
    }
    else
    {
        NSAlert* alert = (NSAlert*)ConstructNSAlert();

        int button = -1;
        button = [alert runModal];
        [alert release];
        ModalFinishedCallback(alert, button);
    }

    return GetReturnCode();
}

void wxMessageDialog::ShowWindowModal()
{
    NSAlert* alert = (NSAlert*)ConstructNSAlert();

    wxNonOwnedWindow* parentWindow = NULL;

    m_modality = wxDIALOG_MODALITY_WINDOW_MODAL;

    if (GetParent())
        parentWindow = dynamic_cast<wxNonOwnedWindow*>(wxGetTopLevelParent(GetParent()));

    wxASSERT_MSG(parentWindow, "Window modal display requires parent.");

    if (parentWindow)
    {
        NSWindow* nativeParent = parentWindow->GetWXWindow();
        ModalDialogDelegate* sheetDelegate = [[ModalDialogDelegate alloc] init];
        [sheetDelegate setImplementation: this];
        [alert beginSheetModalForWindow: nativeParent modalDelegate: sheetDelegate
            didEndSelector: @selector(sheetDidEnd:returnCode:contextInfo:)
            contextInfo: nil];
    }
}

void wxMessageDialog::ModalFinishedCallback(void* panel, int resultCode)
{
    int resultbutton = wxID_CANCEL;
    if ( resultCode < NSAlertFirstButtonReturn )
        resultbutton = wxID_CANCEL;
    else
    {
        if ( resultCode - NSAlertFirstButtonReturn < m_buttonCount )
            resultbutton = m_buttonId[ resultCode - NSAlertFirstButtonReturn ];
        else
            resultbutton = wxID_CANCEL;
    }
    SetReturnCode(resultbutton);
    
    if (GetModality() == wxDIALOG_MODALITY_WINDOW_MODAL)
        SendWindowModalDialogEvent ( wxEVT_WINDOW_MODAL_DIALOG_CLOSED  );
}

void* wxMessageDialog::ConstructNSAlert()
{
    const long style = GetMessageDialogStyle();

    wxASSERT_MSG( (style & 0x3F) != wxYES, wxT("this style is not supported on Mac") );

    // work out what to display
    // if the extended text is empty then we use the caption as the title
    // and the message as the text (for backwards compatibility)
    // but if the extended message is not empty then we use the message as the title
    // and the extended message as the text because that makes more sense

    wxString msgtitle,msgtext;
    if(m_extendedMessage.IsEmpty())
    {
        msgtitle = m_caption;
        msgtext  = m_message;
    }
    else
    {
        msgtitle = m_message;
        msgtext  = m_extendedMessage;
    }

    NSAlert* alert = [[NSAlert alloc] init];
    NSAlertStyle alertType = GetAlertStyleFromWXStyle(style);

    wxCFStringRef cfNoString( GetNoLabel(), GetFont().GetEncoding() );
    wxCFStringRef cfYesString( GetYesLabel(), GetFont().GetEncoding() );
    wxCFStringRef cfOKString( GetOKLabel(), GetFont().GetEncoding() );
    wxCFStringRef cfCancelString( GetCancelLabel(), GetFont().GetEncoding() );

    wxCFStringRef cfTitle( msgtitle, GetFont().GetEncoding() );
    wxCFStringRef cfText( msgtext, GetFont().GetEncoding() );

    [alert setMessageText:cfTitle.AsNSString()];
    [alert setInformativeText:cfText.AsNSString()];
    [alert setAlertStyle:alertType];

    m_buttonCount = 0;

    if (style & wxYES_NO)
    {
        if ( style & wxNO_DEFAULT )
        {
            [alert addButtonWithTitle:cfNoString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_NO;
            [alert addButtonWithTitle:cfYesString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_YES;
        }
        else
        {
            [alert addButtonWithTitle:cfYesString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_YES;
            [alert addButtonWithTitle:cfNoString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_NO;
        }

        if (style & wxCANCEL)
        {
            [alert addButtonWithTitle:cfCancelString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_CANCEL;
        }
    }
    // the MSW implementation even shows an OK button if it is not specified, we'll do the same
    else
    {
        [alert addButtonWithTitle:cfOKString.AsNSString()];
        m_buttonId[ m_buttonCount++ ] = wxID_OK;
        if (style & wxCANCEL)
        {
            [alert addButtonWithTitle:cfCancelString.AsNSString()];
            m_buttonId[ m_buttonCount++ ] = wxID_CANCEL;
        }
    }
    return alert;
}