fix for potential crash when conversion fails

[wxWidgets.git] / samples / docview / doc.cpp

/////////////////////////////////////////////////////////////////////////////
// Name:        doc.cpp
// Purpose:     Implements document functionality
// Author:      Julian Smart
// Modified by:
// Created:     04/01/98
// RCS-ID:      $Id$
// Copyright:   (c) Julian Smart
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

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

#ifdef __BORLANDC__
#pragma hdrstop
#endif

#ifndef WX_PRECOMP
#include "wx/wx.h"
#endif
#include "wx/txtstrm.h"
#ifdef __WXMAC__
#include "wx/filename.h"
#endif

#if !wxUSE_DOC_VIEW_ARCHITECTURE
#error You must set wxUSE_DOC_VIEW_ARCHITECTURE to 1 in setup.h!
#endif

#include "doc.h"
#include "view.h"
IMPLEMENT_DYNAMIC_CLASS(DrawingDocument, wxDocument)

DrawingDocument::~DrawingDocument(void)
{
    WX_CLEAR_LIST(wxList, doodleSegments);
}

#if wxUSE_STD_IOSTREAM
wxSTD ostream& DrawingDocument::SaveObject(wxSTD ostream& stream)
{
    wxDocument::SaveObject(stream);

    wxInt32 n = doodleSegments.GetCount();
    stream << n << '\n';

    wxList::compatibility_iterator node = doodleSegments.GetFirst();
    while (node)
    {
        DoodleSegment *segment = (DoodleSegment *)node->GetData();
        segment->SaveObject(stream);
        stream << '\n';

        node = node->GetNext();
    }

    return stream;
}
#else
wxOutputStream& DrawingDocument::SaveObject(wxOutputStream& stream)
{
    wxDocument::SaveObject(stream);

    wxTextOutputStream text_stream( stream );

    wxInt32 n = doodleSegments.GetCount();
    text_stream << n << '\n';

    wxList::compatibility_iterator node = doodleSegments.GetFirst();
    while (node)
    {
        DoodleSegment *segment = (DoodleSegment *)node->GetData();
        segment->SaveObject(stream);
        text_stream << '\n';

        node = node->GetNext();
    }

    return stream;
}
#endif

#if wxUSE_STD_IOSTREAM
wxSTD istream& DrawingDocument::LoadObject(wxSTD istream& stream)
{
    wxDocument::LoadObject(stream);

    wxInt32 n = 0;
    stream >> n;

    for (int i = 0; i < n; i++)
    {
        DoodleSegment *segment = new DoodleSegment;
        segment->LoadObject(stream);
        doodleSegments.Append(segment);
    }

    return stream;
}
#else
wxInputStream& DrawingDocument::LoadObject(wxInputStream& stream)
{
    wxDocument::LoadObject(stream);

    wxTextInputStream text_stream( stream );

    wxInt32 n = 0;
    text_stream >> n;

    for (int i = 0; i < n; i++)
    {
        DoodleSegment *segment = new DoodleSegment;
        segment->LoadObject(stream);
        doodleSegments.Append(segment);
    }

    return stream;
}
#endif

DoodleSegment::DoodleSegment(const DoodleSegment& seg):wxObject()
{
    wxList::compatibility_iterator node = seg.lines.GetFirst();
    while (node)
    {
        DoodleLine *line = (DoodleLine *)node->GetData();
        DoodleLine *newLine = new DoodleLine;
        newLine->x1 = line->x1;
        newLine->y1 = line->y1;
        newLine->x2 = line->x2;
        newLine->y2 = line->y2;

        lines.Append(newLine);

        node = node->GetNext();
    }
}

DoodleSegment::~DoodleSegment(void)
{
    WX_CLEAR_LIST(wxList, lines);
}

#if wxUSE_STD_IOSTREAM
wxSTD ostream& DoodleSegment::SaveObject(wxSTD ostream& stream)
{
    wxInt32 n = lines.GetCount();
    stream << n << '\n';

    wxList::compatibility_iterator node = lines.GetFirst();
    while (node)
    {
        DoodleLine *line = (DoodleLine *)node->GetData();
        stream << line->x1 << " " <<
            line->y1 << " " <<
            line->x2 << " " <<
            line->y2 << "\n";
        node = node->GetNext();
    }

    return stream;
}
#else
wxOutputStream &DoodleSegment::SaveObject(wxOutputStream& stream)
{
    wxTextOutputStream text_stream( stream );

    wxInt32 n = lines.GetCount();
    text_stream << n << _T('\n');

    wxList::compatibility_iterator node = lines.GetFirst();
    while (node)
    {
        DoodleLine *line = (DoodleLine *)node->GetData();
        text_stream << line->x1 << _T(" ") <<
            line->y1 << _T(" ") <<
            line->x2 << _T(" ") <<
            line->y2 << _T("\n");
        node = node->GetNext();
    }

    return stream;
}
#endif

#if wxUSE_STD_IOSTREAM
wxSTD istream& DoodleSegment::LoadObject(wxSTD istream& stream)
{
    wxInt32 n = 0;
    stream >> n;

    for (int i = 0; i < n; i++)
    {
        DoodleLine *line = new DoodleLine;
        stream >> line->x1 >>
            line->y1 >>
            line->x2 >>
            line->y2;
        lines.Append(line);
    }

    return stream;
}
#else
wxInputStream &DoodleSegment::LoadObject(wxInputStream& stream)
{
    wxTextInputStream text_stream( stream );

    wxInt32 n = 0;
    text_stream >> n;

    for (int i = 0; i < n; i++)
    {
        DoodleLine *line = new DoodleLine;
        text_stream >> line->x1 >>
            line->y1 >>
            line->x2 >>
            line->y2;
        lines.Append(line);
    }

    return stream;
}
#endif

void DoodleSegment::Draw(wxDC *dc)
{
    wxList::compatibility_iterator node = lines.GetFirst();
    while (node)
    {
        DoodleLine *line = (DoodleLine *)node->GetData();
        dc->DrawLine(line->x1, line->y1, line->x2, line->y2);
        node = node->GetNext();
    }
}

/*
* Implementation of drawing command
*/

DrawingCommand::DrawingCommand(const wxString& name, int command, DrawingDocument *ddoc, DoodleSegment *seg):
wxCommand(true, name)
{
    doc = ddoc;
    segment = seg;
    cmd = command;
}

DrawingCommand::~DrawingCommand(void)
{
    if (segment)
        delete segment;
}

bool DrawingCommand::Do(void)
{
    switch (cmd)
    {
    case DOODLE_CUT:
        {
            // Cut the last segment
            if (doc->GetDoodleSegments().GetCount() > 0)
            {
                wxList::compatibility_iterator node = doc->GetDoodleSegments().GetLast();
                if (segment)
                    delete segment;

                segment = (DoodleSegment *)node->GetData();
                doc->GetDoodleSegments().Erase(node);

                doc->Modify(true);
                doc->UpdateAllViews();
            }
            break;
        }
    case DOODLE_ADD:
        {
            doc->GetDoodleSegments().Append(new DoodleSegment(*segment));
            doc->Modify(true);
            doc->UpdateAllViews();
            break;
        }
    }
    return true;
}

bool DrawingCommand::Undo(void)
{
    switch (cmd)
    {
    case DOODLE_CUT:
        {
            // Paste the segment
            if (segment)
            {
                doc->GetDoodleSegments().Append(segment);
                doc->Modify(true);
                doc->UpdateAllViews();
                segment = (DoodleSegment *) NULL;
            }
            doc->Modify(true);
            doc->UpdateAllViews();
            break;
        }
    case DOODLE_ADD:
        {
            // Cut the last segment
            if (doc->GetDoodleSegments().GetCount() > 0)
            {
                wxList::compatibility_iterator node = doc->GetDoodleSegments().GetLast();
                DoodleSegment *seg = (DoodleSegment *)node->GetData();
                delete seg;
                doc->GetDoodleSegments().Erase(node);

                doc->Modify(true);
                doc->UpdateAllViews();
            }
        }
    }
    return true;
}

IMPLEMENT_DYNAMIC_CLASS(TextEditDocument, wxDocument)

// Since text windows have their own method for saving to/loading from files,
// we override OnSave/OpenDocument instead of Save/LoadObject
bool TextEditDocument::OnSaveDocument(const wxString& filename)
{
    TextEditView *view = (TextEditView *)GetFirstView();

    if (!view->textsw->SaveFile(filename))
        return false;
    Modify(false);
#ifdef __WXMAC__
    wxFileName fn(filename) ;
    fn.MacSetDefaultTypeAndCreator() ;
#endif
    return true;
}

bool TextEditDocument::OnOpenDocument(const wxString& filename)
{
    TextEditView *view = (TextEditView *)GetFirstView();
    if (!view->textsw->LoadFile(filename))
        return false;

    SetFilename(filename, true);
    Modify(false);
    UpdateAllViews();
    return true;
}

bool TextEditDocument::IsModified(void) const
{
    TextEditView *view = (TextEditView *)GetFirstView();
    if (view)
    {
        return (wxDocument::IsModified() || view->textsw->IsModified());
    }
    else
        return wxDocument::IsModified();
}

void TextEditDocument::Modify(bool mod)
{
    TextEditView *view = (TextEditView *)GetFirstView();

    wxDocument::Modify(mod);

    if (!mod && view && view->textsw)
        view->textsw->DiscardEdits();
}