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100 lines
3.0 KiB
C
100 lines
3.0 KiB
C
3 weeks ago
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/*=========================================================================
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Program: Visualization Toolkit
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Module: vtkObserverMediator.h
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Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
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All rights reserved.
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See Copyright.txt or http://www.kitware.com/Copyright.htm for details.
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This software is distributed WITHOUT ANY WARRANTY; without even
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the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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PURPOSE. See the above copyright notice for more information.
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=========================================================================*/
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/**
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* @class vtkObserverMediator
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* @brief manage contention for cursors and other resources
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*
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* The vtkObserverMediator is a helper class that manages requests for
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* cursor changes from multiple interactor observers (e.g. widgets). It keeps
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* a list of widgets (and their priorities) and their current requests for
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* cursor shape. It then satisfies requests based on widget priority and the
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* relative importance of the request (e.g., a lower priority widget
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* requesting a particular cursor shape will overrule a higher priority
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* widget requesting a default shape).
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*
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* @sa
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* vtkAbstractWidget vtkWidgetRepresentation
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*/
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#ifndef vtkObserverMediator_h
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#define vtkObserverMediator_h
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#include "vtkObject.h"
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#include "vtkRenderingCoreModule.h" // For export macro
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class vtkRenderWindowInteractor;
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class vtkInteractorObserver;
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class vtkObserverMap;
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class VTKRENDERINGCORE_EXPORT vtkObserverMediator : public vtkObject
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{
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public:
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/**
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* Instantiate the class.
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*/
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static vtkObserverMediator* New();
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//@{
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/**
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* Standard macros.
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*/
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vtkTypeMacro(vtkObserverMediator, vtkObject);
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void PrintSelf(ostream& os, vtkIndent indent) override;
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//@}
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//@{
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/**
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* Specify the instance of vtkRenderWindow whose cursor shape is
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* to be managed.
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*/
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void SetInteractor(vtkRenderWindowInteractor* iren);
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vtkGetObjectMacro(Interactor, vtkRenderWindowInteractor);
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//@}
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/**
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* Method used to request a cursor shape. Note that the shape is specified
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* using one of the integral values determined in vtkRenderWindow.h. The
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* method returns a non-zero value if the shape was successfully changed.
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*/
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int RequestCursorShape(vtkInteractorObserver*, int cursorShape);
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/**
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* Remove all requests for cursor shape from a given interactor.
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*/
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void RemoveAllCursorShapeRequests(vtkInteractorObserver*);
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protected:
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vtkObserverMediator();
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~vtkObserverMediator() override;
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// The render window whose cursor we are controlling
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vtkRenderWindowInteractor* Interactor;
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// A map whose key is the observer*, and whose data value is a cursor
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// request. Note that a special compare function is used to sort the
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// widgets based on the observer's priority.
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vtkObserverMap* ObserverMap; // given a widget*, return its data
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// The current observer and cursor shape
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vtkInteractorObserver* CurrentObserver;
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int CurrentCursorShape;
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private:
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vtkObserverMediator(const vtkObserverMediator&) = delete;
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void operator=(const vtkObserverMediator&) = delete;
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};
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#endif
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