basic.cpp

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

  double maxX, maxY, minX, minY;
  double xp = GetX();
  double yp = GetY();
  GetBoundingBoxMin(&minX, &minY);
  GetBoundingBoxMax(&maxX, &maxY);
  double topLeftX = (double)(xp - (maxX / 2.0) - 2.0);
  double topLeftY = (double)(yp - (maxY / 2.0) - 2.0);

    int penWidth = 0;
    if (m_pen)
      penWidth = m_pen->GetWidth();

    dc.SetPen(GetBackgroundPen());
    dc.SetBrush(GetBackgroundBrush());

    dc.DrawRectangle(WXROUND(topLeftX - penWidth), WXROUND(topLeftY - penWidth),
                      WXROUND(maxX + penWidth*2.0 + 4.0), WXROUND(maxY + penWidth*2.0 + 4.0));
}

void wxShape::EraseLinks(wxDC& dc, int attachment, bool recurse)
{
  if (!m_visible)
    return;

  wxNode *current = m_lines.GetFirst();
  while (current)
  {
    wxLineShape *line = (wxLineShape *)current->GetData();
    if (attachment == -1 || ((line->GetTo() == this && line->GetAttachmentTo() == attachment) ||
                             (line->GetFrom() == this && line->GetAttachmentFrom() == attachment)))
      line->GetEventHandler()->OnErase(dc);
    current = current->GetNext();
  }
  if (recurse)
  {
    wxNode *node = m_children.GetFirst();
    while (node)
    {
      wxShape *child = (wxShape *)node->GetData();
      child->EraseLinks(dc, attachment, recurse);
      node = node->GetNext();
    }
  }
}

void wxShape::DrawLinks(wxDC& dc, int attachment, bool recurse)
{
  if (!m_visible)
    return;

  wxNode *current = m_lines.GetFirst();
  while (current)
  {
    wxLineShape *line = (wxLineShape *)current->GetData();
    if (attachment == -1 ||
        (line->GetTo() == this && line->GetAttachmentTo() == attachment) ||
        (line->GetFrom() == this && line->GetAttachmentFrom() == attachment))
      line->Draw(dc);
    current = current->GetNext();
  }
  if (recurse)
  {
    wxNode *node = m_children.GetFirst();
    while (node)
    {
      wxShape *child = (wxShape *)node->GetData();
      child->DrawLinks(dc, attachment, recurse);
      node = node->GetNext();
    }
  }
}

// Returns true if pt1 <= pt2 in the sense that one point comes before another on an
// edge of the shape.
// attachmentPoint is the attachment point (= side) in question.

// This is the default, rectangular implementation.
bool wxShape::AttachmentSortTest(int attachmentPoint, const wxRealPoint& pt1, const wxRealPoint& pt2)
{
    int physicalAttachment = LogicalToPhysicalAttachment(attachmentPoint);
    switch (physicalAttachment)
    {
        case 0:
        case 2:
        {
          return (pt1.x <= pt2.x) ;
        }
        case 1:
        case 3:
        {
          return (pt1.y <= pt2.y) ;
        }
    }

    return false;
}

bool wxShape::MoveLineToNewAttachment(wxDC& dc, wxLineShape *to_move,
                                       double x, double y)
{
  if (GetAttachmentMode() == ATTACHMENT_MODE_NONE)
      return false;

  int newAttachment, oldAttachment;
  double distance;

  // Is (x, y) on this object? If so, find the new attachment point
  // the user has moved the point to
  bool hit = HitTest(x, y, &newAttachment, &distance);
  if (!hit)
    return false;

  EraseLinks(dc);

  if (to_move->GetTo() == this)
    oldAttachment = to_move->GetAttachmentTo();
  else
    oldAttachment = to_move->GetAttachmentFrom();

  // The links in a new ordering.
  wxList newOrdering;

  // First, add all links to the new list.
  wxNode *node = m_lines.GetFirst();
  while (node)
  {
    newOrdering.Append(node->GetData());
    node = node->GetNext();
  }

  // Delete the line object from the list of links; we're going to move
  // it to another position in the list
  newOrdering.DeleteObject(to_move);

  double old_x = (double) -99999.9;
  double old_y = (double) -99999.9;

  node = newOrdering.GetFirst();
  bool found = false;

  while (!found && node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    if ((line->GetTo() == this && oldAttachment == line->GetAttachmentTo()) ||
        (line->GetFrom() == this && oldAttachment == line->GetAttachmentFrom()))
    {
      double startX, startY, endX, endY;
      double xp, yp;
      line->GetEnds(&startX, &startY, &endX, &endY);
      if (line->GetTo() == this)
      {
        xp = endX;
        yp = endY;
      } else
      {
        xp = startX;
        yp = startY;
      }

      wxRealPoint thisPoint(xp, yp);
      wxRealPoint lastPoint(old_x, old_y);
      wxRealPoint newPoint(x, y);

      if (AttachmentSortTest(newAttachment, newPoint, thisPoint) && AttachmentSortTest(newAttachment, lastPoint, newPoint))
      {
        found = true;
        newOrdering.Insert(node, to_move);
      }

      old_x = xp;
      old_y = yp;
    }
    node = node->GetNext();
  }

  if (!found)
    newOrdering.Append(to_move);

  GetEventHandler()->OnChangeAttachment(newAttachment, to_move, newOrdering);

  return true;
}

void wxShape::OnChangeAttachment(int attachment, wxLineShape* line, wxList& ordering)
{
    if (line->GetTo() == this)
        line->SetAttachmentTo(attachment);
    else
        line->SetAttachmentFrom(attachment);

    ApplyAttachmentOrdering(ordering);

    wxClientDC dc(GetCanvas());
    GetCanvas()->PrepareDC(dc);

    MoveLinks(dc);

    if (!GetCanvas()->GetQuickEditMode()) GetCanvas()->Redraw(dc);
}

// Reorders the lines according to the given list.
void wxShape::ApplyAttachmentOrdering(wxList& linesToSort)
{
  // This is a temporary store of all the lines.
  wxList linesStore;

  wxNode *node = m_lines.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    linesStore.Append(line);
    node = node->GetNext();;
  }

  m_lines.Clear();

  node = linesToSort.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    if (linesStore.Member(line))
    {
      // Done this one
      linesStore.DeleteObject(line);
      m_lines.Append(line);
    }
    node = node->GetNext();
  }

  // Now add any lines that haven't been listed in linesToSort.
  node = linesStore.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    m_lines.Append(line);
    node = node->GetNext();
  }
}

// Reorders the lines coming into the node image at this attachment
// position, in the order in which they appear in linesToSort.
// Any remaining lines not in the list will be added to the end.
void wxShape::SortLines(int attachment, wxList& linesToSort)
{
  // This is a temporary store of all the lines at this attachment
  // point. We'll tick them off as we've processed them.
  wxList linesAtThisAttachment;

  wxNode *node = m_lines.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    wxNode *next = node->GetNext();
    if ((line->GetTo() == this && line->GetAttachmentTo() == attachment) ||
        (line->GetFrom() == this && line->GetAttachmentFrom() == attachment))
    {
      linesAtThisAttachment.Append(line);
      delete node;
      node = next;
    }
    else node = node->GetNext();
  }

  node = linesToSort.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    if (linesAtThisAttachment.Member(line))
    {
      // Done this one
      linesAtThisAttachment.DeleteObject(line);
      m_lines.Append(line);
    }
    node = node->GetNext();
  }

  // Now add any lines that haven't been listed in linesToSort.
  node = linesAtThisAttachment.GetFirst();
  while (node)
  {
    wxLineShape *line = (wxLineShape *)node->GetData();
    m_lines.Append(line);
    node = node->GetNext();
  }
}

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

void wxShape::OnLeftClick(double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_CLICK_LEFT) != OP_CLICK_LEFT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnLeftClick(x, y, keys, attachment);
    }
    return;
  }
}

void wxShape::OnRightClick(double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_CLICK_RIGHT) != OP_CLICK_RIGHT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnRightClick(x, y, keys, attachment);
    }
    return;
  }
}

double DragOffsetX = 0.0;
double DragOffsetY = 0.0;

void wxShape::OnDragLeft(bool draw, double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_DRAG_LEFT) != OP_DRAG_LEFT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnDragLeft(draw, x, y, keys, attachment);
    }
    return;
  }

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  dc.SetLogicalFunction(OGLRBLF);

  wxPen dottedPen(*wxBLACK, 1, wxDOT);
  dc.SetPen(dottedPen);
  dc.SetBrush(* wxTRANSPARENT_BRUSH);

  double xx, yy;
  xx = x + DragOffsetX;
  yy = y + DragOffsetY;

  m_canvas->Snap(&xx, &yy);
//  m_xpos = xx; m_ypos = yy;
  double w, h;
  GetBoundingBoxMax(&w, &h);
  GetEventHandler()->OnDrawOutline(dc, xx, yy, w, h);
}

void wxShape::OnBeginDragLeft(double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_DRAG_LEFT) != OP_DRAG_LEFT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnBeginDragLeft(x, y, keys, attachment);
    }
    return;
  }

  DragOffsetX = m_xpos - x;
  DragOffsetY = m_ypos - y;

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  // New policy: don't erase shape until end of drag.
//  Erase(dc);

  double xx, yy;
  xx = x + DragOffsetX;
  yy = y + DragOffsetY;
  m_canvas->Snap(&xx, &yy);
//  m_xpos = xx; m_ypos = yy;
  dc.SetLogicalFunction(OGLRBLF);

  wxPen dottedPen(*wxBLACK, 1, wxDOT);
  dc.SetPen(dottedPen);
  dc.SetBrush((* wxTRANSPARENT_BRUSH));

  double w, h;
  GetBoundingBoxMax(&w, &h);
  GetEventHandler()->OnDrawOutline(dc, xx, yy, w, h);
  m_canvas->CaptureMouse();
}

void wxShape::OnEndDragLeft(double x, double y, int keys, int attachment)
{
  if (!m_draggable)
    return;
  m_canvas->ReleaseMouse();
  if ((m_sensitivity & OP_DRAG_LEFT) != OP_DRAG_LEFT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnEndDragLeft(x, y, keys, attachment);
    }
    return;
  }

  wxClientDC dc(GetCanvas());
  GetCanvas()->PrepareDC(dc);

  dc.SetLogicalFunction(wxCOPY);

  double xx = x + DragOffsetX;
  double yy = y + DragOffsetY;
  m_canvas->Snap(&xx, &yy);
//  canvas->Snap(&m_xpos, &m_ypos);

  // New policy: erase shape at end of drag.
  Erase(dc);

  Move(dc, xx, yy);
  if (m_canvas && !m_canvas->GetQuickEditMode()) m_canvas->Redraw(dc);
}

void wxShape::OnDragRight(bool draw, double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_DRAG_RIGHT) != OP_DRAG_RIGHT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnDragRight(draw, x, y, keys, attachment);
    }
    return;
  }
}

void wxShape::OnBeginDragRight(double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_DRAG_RIGHT) != OP_DRAG_RIGHT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnBeginDragRight(x, y, keys, attachment);
    }
    return;
  }
}

void wxShape::OnEndDragRight(double x, double y, int keys, int attachment)
{
  if ((m_sensitivity & OP_DRAG_RIGHT) != OP_DRAG_RIGHT)
  {
    attachment = 0;
    double dist;
    if (m_parent)
    {
      m_parent->HitTest(x, y, &attachment, &dist);
      m_parent->GetEventHandler()->OnEndDragRight(x, y, keys, attachment);
    }
    return;
  }
}

void wxShape::OnDrawOutline(wxDC& dc, double x, double y, double w, double h)
{
  double top_left_x = (double)(x - w/2.0);
  double top_left_y = (double)(y - h/2.0);
  double top_right_x = (double)(top_left_x + w);
  double top_right_y = (double)top_left_y;
  double bottom_left_x = (double)top_left_x;
  double bottom_left_y = (double)(top_left_y + h);