Class ToolBarResizer

src/toolbars/ToolBar.cpp:68–277

/// right hand side.  Responsible for drawing the resizer appearance, 
/// resizing mouse events and constraining the resizing.
class ToolBarResizer final : public wxWindow
{
public:
   ToolBarResizer(ToolBar *mBar);
   virtual ~ToolBarResizer();

   // We don't need or want to accept focus.
   // Note that AcceptsFocusFromKeyboard() is overridden rather than
   // AcceptsFocus(), so that resize can be cancelled by ESC
   bool AcceptsFocusFromKeyboard() const override {return false;}

private:
   void OnErase(wxEraseEvent & event);
   void OnPaint(wxPaintEvent & event);
   void OnLeftDown(wxMouseEvent & event);
   void OnLeftUp(wxMouseEvent & event);
   void OnEnter(wxMouseEvent & event);
   void OnLeave(wxMouseEvent & event);
   void OnMotion(wxMouseEvent & event);
   void ResizeBar(const wxSize &size);
   void OnCaptureLost(wxMouseCaptureLostEvent & event);
   void OnKeyDown(wxKeyEvent &event);

private:
   ToolBar *mBar;
   wxPoint mResizeOffset;
   wxSize mOrigSize;
   wxWindowRef mOrigFocus{};

   DECLARE_EVENT_TABLE()
};

//
// Event table
//
BEGIN_EVENT_TABLE( ToolBarResizer, wxWindow )
   EVT_ERASE_BACKGROUND( ToolBarResizer::OnErase )
   EVT_PAINT( ToolBarResizer::OnPaint )
   EVT_LEFT_DOWN( ToolBarResizer::OnLeftDown )
   EVT_LEFT_UP( ToolBarResizer::OnLeftUp )
   EVT_ENTER_WINDOW( ToolBarResizer::OnEnter )
   EVT_LEAVE_WINDOW( ToolBarResizer::OnLeave )
   EVT_MOTION( ToolBarResizer::OnMotion )
   EVT_MOUSE_CAPTURE_LOST( ToolBarResizer::OnCaptureLost )
   EVT_KEY_DOWN( ToolBarResizer::OnKeyDown )
END_EVENT_TABLE();

ToolBarResizer::ToolBarResizer(ToolBar *bar)
:  wxWindow(bar, wxID_ANY, wxDefaultPosition, wxSize(RWIDTH, -1))
{
   mBar = bar;
   SetCursor( wxCURSOR_SIZEWE );
}

ToolBarResizer::~ToolBarResizer()
{
   if(HasCapture())
      ReleaseMouse();