/*=========================================================================

   Program: ParaView
   Module:  pqChooseColorPresetReaction.h

   Copyright (c) 2005,2006 Sandia Corporation, Kitware Inc.
   All rights reserved.

   ParaView is a free software; you can redistribute it and/or modify it
   under the terms of the ParaView license version 1.2.

   See License_v1.2.txt for the full ParaView license.
   A copy of this license can be obtained by contacting
   Kitware Inc.
   28 Corporate Drive
   Clifton Park, NY 12065
   USA

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

========================================================================*/
#ifndef pqChooseColorPresetReaction_h
#define pqChooseColorPresetReaction_h

#include "pqReaction.h"
#include "vtkWeakPointer.h" // needed for vtkWeakPointer.
#include <QPointer> // needed for QPointer

class pqDataRepresentation;
class vtkSMProxy;

/// @ingroup Reactions
/// @class pqChooseColorPresetReaction
/// @brief Reaction to pop up a color palette chooser dialog.
///
/// pqChooseColorPresetReaction is used by pqColorEditorPropertyWidget (for example)
/// allow the user to change the color palette. It pops up a modal dialog with
/// color presets to select and apply. There are three ways of using this reaction:
///
/// \li Monitor active representation: To use this mode, pass the \c track_active_objects
/// parameter to the constructor as `true` (default). When in this configuration, the reaction
/// monitors the active representation (via pqActiveObjects) and allows the user to load a
/// preset on the active representation's color/opacity transfer function using the parent
/// action.
///
/// \li Monitor a specific representation: To use this mode, pass the \c track_active_objects
/// parameter to the constructor as `false`. Then the calling code can explicitly set the
/// representation using pqChooseColorPresetReaction::setRepresentation() method. The reaction will
/// monitor this representation and allow user to load preset of its transfer functions.
///
/// \li Control a specific color transfer function: To use this mode, pass the \c track_active_objects
/// parameter to the constructor as `false` and then set the transfer function proxy explictly
/// using pqChooseColorPresetReaction::setTransferFunction() method.
///
/// In all modes, the reaction will fire the presetApplied() signal to indicate a new preset has been
/// applied. Typically one can hook that signal up to render affected views.
class PQAPPLICATIONCOMPONENTS_EXPORT pqChooseColorPresetReaction : public pqReaction
{
  Q_OBJECT
  typedef pqReaction Superclass;
public:
  pqChooseColorPresetReaction(QAction* parent, bool track_active_objects=true);
  virtual ~pqChooseColorPresetReaction();

public slots:
  /// Choose color preset for the representation set using setRepresentation().
  /// Returns false if representation cannot be located or its is not using
  /// scalar coloring.
  bool choosePreset(const char* presetName=NULL);

  /// Set the data representation explicitly when track_active_objects is false.
  void setRepresentation(pqDataRepresentation* repr);

  /// Set the transfer function proxy. This can be used, instead of
  /// setRepresentation() when \c track_active_objects was false to directly set
  /// the transfer function proxy on which to apply the preset.
  void setTransferFunction(vtkSMProxy* lut);

  /// Updates the enabled state. Applications need not explicitly call
  /// this.
  void updateEnableState();

signals:
  /// fired every time a preset is applied.
  void presetApplied();

private slots:
  void applyCurrentPreset();

  /// Called to update the transfer function using the pqDataRepresentation
  /// set by setRepresentation() call;
  void updateTransferFunction();

protected:
  /// Called when the action is triggered.
  virtual void onTriggered();

private:
  Q_DISABLE_COPY(pqChooseColorPresetReaction);
  QPointer<pqDataRepresentation> Representation;
  vtkWeakPointer<vtkSMProxy> TransferFunctionProxy;
};

#endif
