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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.
=========================================================================*/
/**
* @class vtkObserverMediator
* @brief manage contention for cursors and other resources
*
* 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).
*
* @sa
* vtkAbstractWidget vtkWidgetRepresentation
*/
#ifndef vtkObserverMediator_h
#define vtkObserverMediator_h
#include "vtkObject.h"
#include "vtkRenderingCoreModule.h" // For export macro
VTK_ABI_NAMESPACE_BEGIN
class vtkRenderWindowInteractor;
class vtkInteractorObserver;
class vtkObserverMap;
class VTKRENDERINGCORE_EXPORT vtkObserverMediator : public vtkObject
{
public:
/**
* Instantiate the class.
*/
static vtkObserverMediator* New();
///@{
/**
* Standard macros.
*/
vtkTypeMacro(vtkObserverMediator, vtkObject);
void PrintSelf(ostream& os, vtkIndent indent) override;
///@}
///@{
/**
* Specify the instance of vtkRenderWindow whose cursor shape is
* to be managed.
*/
void SetInteractor(vtkRenderWindowInteractor* iren);
vtkGetObjectMacro(Interactor, vtkRenderWindowInteractor);
///@}
/**
* 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 requestedShape);
/**
* Remove all requests for cursor shape from a given interactor.
*/
void RemoveAllCursorShapeRequests(vtkInteractorObserver*);
protected:
vtkObserverMediator();
~vtkObserverMediator() override;
// 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&) = delete;
void operator=(const vtkObserverMediator&) = delete;
};
VTK_ABI_NAMESPACE_END
#endif
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