constrnt.cpp

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

        spacingY = m_ySpacing;
        startY = (double)(y - ((totalObjectHeight + (n+1)*spacingY)/2.0));
      }

      // Now position the objects
      bool changed = false;
      node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();
        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);
        startX += (double)(spacingX + (width2/2.0));
        startY += (double)(spacingY + (height2/2.0));

        if ((!Equals(startX, constrainedObject->GetX())) || (!Equals(startY, constrainedObject->GetY())))
        {
          constrainedObject->Move(dc, startX, startY, false);
          changed = true;
        }

        startX += (double)(width2/2.0);
        startY += (double)(height2/2.0);

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_LEFT_OF:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double x3 = (double)(x - (minWidth/2.0) - (width2/2.0) - m_xSpacing);
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_RIGHT_OF:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double x3 = (double)(x + (minWidth/2.0) + (width2/2.0) + m_xSpacing);
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_ABOVE:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double y3 = (double)(y - (minHeight/2.0) - (height2/2.0) - m_ySpacing);
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_BELOW:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double y3 = (double)(y + (minHeight/2.0) + (height2/2.0) + m_ySpacing);
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_ALIGNED_LEFT:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double x3 = (double)(x - (minWidth/2.0) + (width2/2.0) + m_xSpacing);
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_ALIGNED_RIGHT:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double x3 = (double)(x + (minWidth/2.0) - (width2/2.0) - m_xSpacing);
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
      #if 0
      // two returned values ?
      return false;
      #endif
    }
    case gyCONSTRAINT_ALIGNED_TOP:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double y3 = (double)(y - (minHeight/2.0) + (height2/2.0) + m_ySpacing);
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_ALIGNED_BOTTOM:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double width2, height2;
        constrainedObject->GetBoundingBoxMax(&width2, &height2);

        double y3 = (double)(y + (minHeight/2.0) - (height2/2.0) - m_ySpacing);
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_MIDALIGNED_LEFT:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double x3 = (double)(x - (minWidth/2.0));
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_MIDALIGNED_RIGHT:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double x3 = (double)(x + (minWidth/2.0));
        if (!Equals(x3, constrainedObject->GetX()))
        {
          changed = true;
          constrainedObject->Move(dc, x3, constrainedObject->GetY(), false);
        }

        node = node->GetNext();
      }
      return changed;
      #if 0
      // two returned values ?
      return false;
      #endif
    }
    case gyCONSTRAINT_MIDALIGNED_TOP:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double y3 = (double)(y - (minHeight/2.0));
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    case gyCONSTRAINT_MIDALIGNED_BOTTOM:
    {
      bool changed = false;

      wxNode *node = m_constrainedObjects.GetFirst();
      while (node)
      {
        wxShape *constrainedObject = (wxShape *)node->GetData();

        double y3 = (double)(y + (minHeight/2.0));
        if (!Equals(y3, constrainedObject->GetY()))
        {
          changed = true;
          constrainedObject->Move(dc, constrainedObject->GetX(), y3, false);
        }

        node = node->GetNext();
      }
      return changed;
    }
    #if 0
    // default value handled in main function body
    default:
      return false;
    #endif
  }
  return false;
}