basic.cpp

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

void wxShape::ClearText(int regionId)
{
  if (regionId == 0)
  {
    m_text.DeleteContents(true);
    m_text.Clear();
    m_text.DeleteContents(false);
  }
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  region->ClearText();
}

void wxShape::ClearRegions()
{
  wxNode *node = m_regions.GetFirst();
  while (node)
  {
    wxShapeRegion *region = (wxShapeRegion *)node->GetData();
    wxNode *next = node->GetNext();
    delete region;
    delete node;
    node = next;
  }
}

void wxShape::AddRegion(wxShapeRegion *region)
{
  m_regions.Append(region);
}

void wxShape::SetDefaultRegionSize()
{
  wxNode *node = m_regions.GetFirst();
  if (!node) return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  double w, h;
  GetBoundingBoxMin(&w, &h);
  region->SetSize(w, h);
}

bool wxShape::HitTest(double x, double y, int *attachment, double *distance)
{
//  if (!sensitive)
//    return false;

  double width = 0.0, height = 0.0;
  GetBoundingBoxMin(&width, &height);
  if (fabs(width) < 4.0) width = 4.0;
  if (fabs(height) < 4.0) height = 4.0;

  width += (double)4.0; height += (double)4.0; // Allowance for inaccurate mousing

  double left = (double)(m_xpos - (width/2.0));
  double top = (double)(m_ypos - (height/2.0));
  double right = (double)(m_xpos + (width/2.0));
  double bottom = (double)(m_ypos + (height/2.0));

  int nearest_attachment = 0;

  // If within the bounding box, check the attachment points
  // within the object.

  if (x >= left && x <= right && y >= top && y <= bottom)
  {
    int n = GetNumberOfAttachments();
    double nearest = 999999.0;

    // GetAttachmentPosition[Edge] takes a logical attachment position,
    // i.e. if it's rotated through 90%, position 0 is East-facing.

    for (int i = 0; i < n; i++)
    {
      double xp, yp;
      if (GetAttachmentPositionEdge(i, &xp, &yp))
      {
        double l = (double)sqrt(((xp - x) * (xp - x)) +
                   ((yp - y) * (yp - y)));

        if (l < nearest)
        {
          nearest = l;
          nearest_attachment = i;
        }
      }
    }
    *attachment = nearest_attachment;
    *distance = nearest;
    return true;
  }
  else return false;
}

// Format a text string according to the region size, adding
// strings with positions to region text list

static bool GraphicsInSizeToContents = false; // Infinite recursion elimination
void wxShape::FormatText(wxDC& dc, const wxString& s, int i)
{
  double w, h;
  ClearText(i);

  if (m_regions.GetCount() < 1)
    return;
  wxNode *node = m_regions.Item(i);
  if (!node)
    return;

  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  // region->SetText(s);  // don't set the formatted text yet, it will be done below
  region->m_regionText = s;
  dc.SetFont(* region->GetFont());

  region->GetSize(&w, &h);

  wxStringList *stringList = oglFormatText(dc, s, (w-2*m_textMarginX), (h-2*m_textMarginY), region->GetFormatMode());
  node = (wxNode*)stringList->GetFirst();
  while (node)
  {
    wxChar *s = (wxChar *)node->GetData();
    wxShapeTextLine *line = new wxShapeTextLine(0.0, 0.0, s);
    region->GetFormattedText().Append((wxObject *)line);
    node = node->GetNext();
  }
  delete stringList;
  double actualW = w;
  double actualH = h;
  // Don't try to resize an object with more than one image (this case should be dealt
  // with by overriden handlers)
  if ((region->GetFormatMode() & FORMAT_SIZE_TO_CONTENTS) &&
      (region->GetFormattedText().GetCount() > 0) &&
      (m_regions.GetCount() == 1) && !GraphicsInSizeToContents)
  {
    oglGetCentredTextExtent(dc, &(region->GetFormattedText()), m_xpos, m_ypos, w, h, &actualW, &actualH);
    if ((actualW+2*m_textMarginX != w ) || (actualH+2*m_textMarginY != h))
    {
      // If we are a descendant of a composite, must make sure the composite gets
      // resized properly
      wxShape *topAncestor = GetTopAncestor();

      if (topAncestor != this)
      {
        // Make sure we don't recurse infinitely
        GraphicsInSizeToContents = true;

        wxCompositeShape *composite = (wxCompositeShape *)topAncestor;
        composite->Erase(dc);
        SetSize(actualW+2*m_textMarginX, actualH+2*m_textMarginY);
        Move(dc, m_xpos, m_ypos);
        composite->CalculateSize();
        if (composite->Selected())
        {
          composite->DeleteControlPoints(& dc);
          composite->MakeControlPoints();
          composite->MakeMandatoryControlPoints();
        }
        // Where infinite recursion might happen if we didn't stop it
        composite->Draw(dc);

        GraphicsInSizeToContents = false;
      }
      else
      {
        Erase(dc);
        SetSize(actualW+2*m_textMarginX, actualH+2*m_textMarginY);
        Move(dc, m_xpos, m_ypos);
      }
      SetSize(actualW+2*m_textMarginX, actualH+2*m_textMarginY);
      Move(dc, m_xpos, m_ypos);
      EraseContents(dc);
    }
  }
  oglCentreText(dc, &(region->GetFormattedText()), m_xpos, m_ypos, actualW-2*m_textMarginX, actualH-2*m_textMarginY, region->GetFormatMode());
  m_formatted = true;
}

void wxShape::Recentre(wxDC& dc)
{
  double w, h;
  GetBoundingBoxMin(&w, &h);

  int noRegions = m_regions.GetCount();
  for (int i = 0; i < noRegions; i++)
  {
    wxNode *node = m_regions.Item(i);
    if (node)
    {
      wxShapeRegion *region = (wxShapeRegion *)node->GetData();
      oglCentreText(dc, &(region->GetFormattedText()), m_xpos, m_ypos, w-2*m_textMarginX, h-2*m_textMarginY, region->GetFormatMode());
    }
  }
}

bool wxShape::GetPerimeterPoint(double WXUNUSED(x1), double WXUNUSED(y1),
                                     double WXUNUSED(x2), double WXUNUSED(y2),
                                     double *WXUNUSED(x3), double *WXUNUSED(y3))
{
  return false;
}

void wxShape::SetPen(const wxPen *the_pen)
{
  m_pen = the_pen;
}

void wxShape::SetBrush(const wxBrush *the_brush)
{
  m_brush = the_brush;
}

// Get the top-most (non-division) ancestor, or self
wxShape *wxShape::GetTopAncestor()
{
  if (!GetParent())
    return this;

  if (GetParent()->IsKindOf(CLASSINFO(wxDivisionShape)))
    return this;
  else return GetParent()->GetTopAncestor();
}

/*
 * Region functions
 *
 */
void wxShape::SetFont(wxFont *the_font, int regionId)
{
  m_font = the_font;
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  region->SetFont(the_font);
}

wxFont *wxShape::GetFont(int n) const
{
  wxNode *node = m_regions.Item(n);
  if (!node)
    return NULL;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  return region->GetFont();
}

void wxShape::SetFormatMode(int mode, int regionId)
{
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  region->SetFormatMode(mode);
}

int wxShape::GetFormatMode(int regionId) const
{
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return 0;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  return region->GetFormatMode();
}

void wxShape::SetTextColour(const wxString& the_colour, int regionId)
{
  m_textColour = wxTheColourDatabase->Find(the_colour);
  m_textColourName = the_colour;

  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  region->SetColour(the_colour);
}

wxString wxShape::GetTextColour(int regionId) const
{
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return wxEmptyString;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  return region->GetColour();
}

void wxShape::SetRegionName(const wxString& name, int regionId)
{
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  region->SetName(name);
}

wxString wxShape::GetRegionName(int regionId)
{
  wxNode *node = m_regions.Item(regionId);
  if (!node)
    return wxEmptyString;
  wxShapeRegion *region = (wxShapeRegion *)node->GetData();
  return region->GetName();
}

int wxShape::GetRegionId(const wxString& name)
{
  wxNode *node = m_regions.GetFirst();
  int i = 0;
  while (node)
  {
    wxShapeRegion *region = (wxShapeRegion *)node->GetData();
    if (region->GetName() == name)
      return i;
    node = node->GetNext();
    i ++;
  }
  return -1;
}

// Name all m_regions in all subimages recursively.
void wxShape::NameRegions(const wxString& parentName)
{
  int n = GetNumberOfTextRegions();
  wxString buff;
  for (int i = 0; i < n; i++)
  {
    if (parentName.Length() > 0)
      buff << parentName << wxT(".") << i;
    else
      buff << i;
    SetRegionName(buff, i);
  }
  wxNode *node = m_children.GetFirst();
  int j = 0;
  while (node)
  {
    buff.Empty();
    wxShape *child = (wxShape *)node->GetData();
    if (parentName.Length() > 0)
      buff << parentName << wxT(".") << j;
    else
      buff << j;
    child->NameRegions(buff);
    node = node->GetNext();
    j ++;
  }
}

// Get a region by name, possibly looking recursively into composites.
wxShape *wxShape::FindRegion(const wxString& name, int *regionId)
{
  int id = GetRegionId(name);
  if (id > -1)
  {
    *regionId = id;
    return this;
  }

  wxNode *node = m_children.GetFirst();
  while (node)
  {
    wxShape *child = (wxShape *)node->GetData();
    wxShape *actualImage = child->FindRegion(name, regionId);
    if (actualImage)
      return actualImage;
    node = node->GetNext();
  }
  return NULL;
}

// Finds all region names for this image (composite or simple).
// Supply empty string list.
void wxShape::FindRegionNames(wxStringList& list)
{
  int n = GetNumberOfTextRegions();
  for (int i = 0; i < n; i++)
  {
    wxString name(GetRegionName(i));
    list.Add(name);
  }

  wxNode *node = m_children.GetFirst();
  while (node)
  {
    wxShape *child = (wxShape *)node->GetData();
    child->FindRegionNames(list);
    node = node->GetNext();
  }
}

void wxShape::AssignNewIds()
{
//  if (m_id == 0)
  m_id = wxNewId();
  wxNode *node = m_children.GetFirst();
  while (node)
  {
    wxShape *child = (wxShape *)node->GetData();
    child->AssignNewIds();
    node = node->GetNext();
  }
}

void wxShape::OnDraw(wxDC& WXUNUSED(dc))
{
}

void wxShape::OnMoveLinks(wxDC& dc)
{
  // Want to set the ends of all attached links
  // to point to/from this object

  wxNode *current = m_lines.GetFirst();
  while (current)
  {
    wxLineShape *line = (wxLineShape *)current->GetData();
    line->GetEventHandler()->OnMoveLink(dc);
    current = current->GetNext();
  }
}


void wxShape::OnDrawContents(wxDC& dc)
{
  double bound_x, bound_y;
  GetBoundingBoxMin(&bound_x, &bound_y);
    if (m_regions.GetCount() < 1) return;

    if (m_pen) dc.SetPen(* m_pen);

    wxShapeRegion *region = (wxShapeRegion *)m_regions.GetFirst()->GetData();
    if (region->GetFont()) dc.SetFont(* region->GetFont());

    dc.SetTextForeground(region->GetActualColourObject());
    dc.SetBackgroundMode(wxTRANSPARENT);
    if (!m_formatted)
    {
      oglCentreText(dc, &(region->GetFormattedText()), m_xpos, m_ypos, bound_x-2*m_textMarginX, bound_y-2*m_textMarginY, region->GetFormatMode());
      m_formatted = true;
    }
    if (!GetDisableLabel())
    {
      oglDrawFormattedText(dc, &(region->GetFormattedText()), m_xpos, m_ypos, bound_x-2*m_textMarginX, bound_y-2*m_textMarginY, region->GetFormatMode());
    }
}

void wxShape::DrawContents(wxDC& dc)
{
  GetEventHandler()->OnDrawContents(dc);
}

void wxShape::OnSize(double WXUNUSED(x), double WXUNUSED(y))
{
}

bool wxShape::OnMovePre(wxDC& WXUNUSED(dc), double WXUNUSED(x), double WXUNUSED(y), double WXUNUSED(old_x), double WXUNUSED(old_y), bool WXUNUSED(display))
{
  return true;
}

void wxShape::OnMovePost(wxDC& WXUNUSED(dc), double WXUNUSED(x), double WXUNUSED(y), double WXUNUSED(old_x), double WXUNUSED(old_y), bool WXUNUSED(display))
{
}

void wxShape::OnErase(wxDC& dc)
{
  if (!m_visible)
    return;

  // Erase links
  wxNode *current = m_lines.GetFirst();
  while (current)
  {
    wxLineShape *line = (wxLineShape *)current->GetData();
    line->GetEventHandler()->OnErase(dc);
    current = current->GetNext();
  }
  GetEventHandler()->OnEraseContents(dc);
}

void wxShape::OnEraseContents(wxDC& dc)
{
  if (!m_visible)
    return;