#ifndef FUNCTIONVIEWER_H
#define FUNCTIONVIEWER_H

// TnzCore includes
#include "tcommon.h"

// TnzLib includes
#include "toonz/tframehandle.h"

// TnzQt includes
#include "toonzqt/treemodel.h"

// Qt includes
#include <QSplitter>

#undef DVAPI
#undef DVVAR
#ifdef TOONZQT_EXPORTS
#define DVAPI DV_EXPORT_API
#define DVVAR DV_EXPORT_VAR
#else
#define DVAPI DV_IMPORT_API
#define DVVAR DV_IMPORT_VAR
#endif

//==================================================

//    Forward declarations

class TParam;
class TDoubleParam;
class TXsheetHandle;
class TObjectHandle;
class TFxHandle;
class TColumnHandle;
class TStageObject;
class TSceneHandle;

class FrameNavigator;
class FunctionTreeView;
class FunctionPanel;
class FunctionSheet;
class FunctionKeyframeNavigator;
class FunctionSegmentViewer;
class FunctionToolbar;
class FunctionSelection;

class QStackedWidget;
class QAction;
class QScrollArea;
class QSplitter;

namespace DVGui
{
class ValueField;
}

//==================================================

//************************************************************************
//    FunctionViewer  declaration
//************************************************************************

// Function editor widget
class DVAPI FunctionViewer : public QSplitter
{
	Q_OBJECT

public:
	enum IoType { eSaveCurve,
				  eLoadCurve,
				  eExportCurve };

public:
#if QT_VERSION >= 0x050500
	FunctionViewer(QWidget *parent = 0, Qt::WindowFlags flags = 0);
#else
	FunctionViewer(QWidget *parent = 0, Qt::WFlags flags = 0);
#endif
	~FunctionViewer();

	void setXsheetHandle(TXsheetHandle *xshHandle);	//!< Associates an xsheet to the function editor.
	void setFrameHandle(TFrameHandle *frameHandle);	//!< Synchronizes an external timeline with the function editor.
	void setObjectHandle(TObjectHandle *objectHandle); //!< Associates a stage objects selector to the function editor.
	void setFxHandle(TFxHandle *fxHandle);			   //!< Associates an fx selector to the function editor.
	void setColumnHandle(TColumnHandle *columnHandle); //!< Associates a column selector to the function editor.

	FunctionSelection *getSelection() const
	{
		return m_selection;
	}

	void openContextMenu(TreeModel::Item *item, const QPoint &globalPos);

	void addParameter(TParam *parameter,
					  const TFilePath &folder = TFilePath()); //!< Adds the specified parameter to the function editor.               \param parameter Parameter to be added. Ownership remains \a external. \param folder Host folder (created if necessary) the parameter will be added to.

	void setFocusColumnsOrGraph();
	void clearFocusColumnsAndGraph();
	bool columnsOrGraphHasFocus();
	void setSceneHandle(TSceneHandle *sceneHandle);

signals:

	void curveChanged();
	void curveIo(int type, TDoubleParam *curve, const std::string &name);
	void editObject();

public slots:

	void refreshModel();
	void rebuildModel();
	void onFrameSwitched();
	void toggleMode();
	void onValueFieldChanged();
	void onXsheetChanged();
	void onStageObjectSwitched();
	void onStageObjectChanged(bool isDragging = false);
	void onFxSwitched();

	void onCurveChanged(bool isDragging);
	void onCurveSelected(TDoubleParam *);
	void onSelectionChanged();

	void doSwitchCurrentObject(TStageObject *obj);
	void doSwitchCurrentFx(TFx *fx);

	//in order to avoid FunctionViewer to get focus while editing the expression
	bool isExpressionPageActive();

private:
	// Handles

	TXsheetHandle *m_xshHandle;
	TFrameHandle *m_frameHandle;
	TObjectHandle *m_objectHandle;
	TFxHandle *m_fxHandle;
	TColumnHandle *m_columnHandle;
	TSceneHandle *m_sceneHandle;

	TFrameHandle m_localFrame; //!< Internal timeline - which is attached to m_frameHandle
							   //!  <I>in case</I> it is not zero.
	// Widgets

	FunctionTreeView *m_treeView;			//!< Tree view on the left side of the viewer.
	FunctionToolbar *m_toolbar;				//!< Central area's toolbar
	FunctionPanel *m_functionGraph;			//!< The function graph view widget.
	FunctionSheet *m_numericalColumns;		//!< The numerical columns view widget.
	FunctionSegmentViewer *m_segmentViewer; //!< Lower segment editor.

	// Current objects

	TDoubleParam *m_curve;
	FunctionSelection *m_selection;

private:
	void showEvent(QShowEvent *);
	void hideEvent(QHideEvent *);

public:												 //  :(
	void emitCurveChanged() { emit curveChanged(); } //!< \deprecated  Should not be public.
	void emitIoCurve(int type, TDoubleParam *curve, const std::string &name)
	{
		emit curveIo(type, curve, name);
	} //!< \deprecated  Should not be public.

private slots:

	void propagateExternalSetFrame(); //!< Forwards m_frameHandle's setFrame() invocations to m_localFrame.
};

#endif // FUNCTIONEDITORVIEWER_H