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/*=========================================================================
Program: Visualization Toolkit
Module: vtkObserverMediator.h
Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE. See the above copyright notice for more information.
=========================================================================*/
// .NAME vtkObserverMediator - manage contention for cursors and other resources
// .SECTION Description
// The vtkObserverMediator is a helper class that manages requests for
// cursor changes from multiple interactor observers (e.g. widgets). It keeps
// a list of widgets (and their priorities) and their current requests for
// cursor shape. It then satisfies requests based on widget priority and the
// relative importance of the request (e.g., a lower priority widget
// requesting a particular cursor shape will overrule a higher priority
// widget requesting a default shape).
// .SECTION See Also
// vtkAbstractWidget vtkWidgetRepresentation
#ifndef vtkObserverMediator_h
#define vtkObserverMediator_h
#include "vtkRenderingCoreModule.h" // For export macro
#include "vtkObject.h"
class vtkRenderWindowInteractor;
class vtkInteractorObserver;
class vtkObserverMap;
class VTKRENDERINGCORE_EXPORT vtkObserverMediator : public vtkObject
{
public:
// Description:
// Instantiate the class.
static vtkObserverMediator *New();
// Description:
// Standard macros.
vtkTypeMacro(vtkObserverMediator,vtkObject);
void PrintSelf(ostream& os, vtkIndent indent);
// Description:
// Specify the instance of vtkRenderWindow whose cursor shape is
// to be managed.
void SetInteractor(vtkRenderWindowInteractor* iren);
vtkGetObjectMacro(Interactor, vtkRenderWindowInteractor);
// Description:
// Method used to request a cursor shape. Note that the shape is specified
// using one of the integral values determined in vtkRenderWindow.h. The
// method returns a non-zero value if the shape was successfully changed.
int RequestCursorShape(vtkInteractorObserver*, int cursorShape);
// Description:
// Remove all requests for cursor shape from a given interactor.
void RemoveAllCursorShapeRequests(vtkInteractorObserver*);
protected:
vtkObserverMediator();
~vtkObserverMediator();
// The render window whose cursor we are controlling
vtkRenderWindowInteractor *Interactor;
// A map whose key is the observer*, and whose data value is a cursor
// request. Note that a special compare function is used to sort the
// widgets based on the observer's priority.
vtkObserverMap *ObserverMap; //given a widget*, return its data
// The current observer and cursor shape
vtkInteractorObserver *CurrentObserver;
int CurrentCursorShape;
private:
vtkObserverMediator(const vtkObserverMediator&); //Not implemented
void operator=(const vtkObserverMediator&); //Not implemented
};
#endif
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