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#pragma once
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#ifndef DVSCROLLWIDGET_H
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#define DVSCROLLWIDGET_H
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// TnzCore includes
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#include "tcommon.h"
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// Qt includes
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#include <qframe></qframe>
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#include <qeasingcurve></qeasingcurve>
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#undef DVAPI
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#undef DVVAR
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#ifdef TOONZQT_EXPORTS
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#define DVAPI DV_EXPORT_API
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#define DVVAR DV_EXPORT_VAR
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#else
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#define DVAPI DV_IMPORT_API
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#define DVVAR DV_IMPORT_VAR
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#endif
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//====================================================
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//    Forward declarations
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class FreeLayout;
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class QPropertyAnimation;
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class QPushButton;
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class QTimer;
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//====================================================
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//****************************************************************************
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//    DvScrollWidget class
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//****************************************************************************
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/*!
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  \brief    The DvScrollWidget class is a QScrollArea-like container
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            widget for monodirectional scrolling.
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  \details  Unlike a QScrollArea, scrolling is enforced using directional
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  buttons
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            at the side of the content whose activation performs animated
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  scrolling
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            by half a widget in the represented direction.
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            Alternatively, free-scroll is available by default where mouse
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  events
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            are un-accepted by the content's child widgets.
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            The push buttons at the side of the content appear only when there
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  is
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            available content space in that direction. They are \a empty by
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  default,
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            but can be filled in or styled with a style sheet.
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            In the latter case, they are given an object name dependent on the
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            scroll orientation - in the form
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  <tt>Scroll<left down="" right="" up="">Button</left></tt>.
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  \note     The default size QSizePolicy for DvScrollWidget is \p Preferred in
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            the orientation direction, and \p Fixed in the other.
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  \sa       The FreeLayout class.
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*/
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class DVAPI DvScrollWidget final : public QFrame {
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  Q_OBJECT
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  QWidget *m_content;
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  QPushButton *m_scrollBackward, *m_scrollForward;
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  QPropertyAnimation *m_animation;
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  QEasingCurve m_clickEase, m_holdEase;
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  QTimer *m_backwardTimer, *m_forwardTimer;
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  int m_mousePos;
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  bool m_horizontal, m_pressed, m_heldRelease, m_heldClick;
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public:
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  DvScrollWidget(QWidget *parent = 0, Qt::Orientation = Qt::Horizontal);
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  ~DvScrollWidget() {}
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  /*! \remark Ownership is \a transferred to this class. Any previously set
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     widget
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        is deleted before being replaced. */
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  void setWidget(QWidget *widget);  //!< Sets the scrollable content widget.
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  /*! \note   Function setOrientation() restores the widget's size policy
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     to
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        \p Preferred in the specified direction, and \p Fixed in the other. */
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  void setOrientation(Qt::Orientation orientation);
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  Qt::Orientation getOrientation() const;
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  void setEasing(QEasingCurve clickEase, QEasingCurve holdPressEase);
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  void scroll(int dx, int duration = 0,
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              QEasingCurve easing = QEasingCurve(QEasingCurve::OutCubic));
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  void scrollTo(int pos, int duration = 0,
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                QEasingCurve easing = QEasingCurve(QEasingCurve::OutCubic));
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public slots:
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  void scrollBackward();
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  void scrollForward();
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protected:
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  void resizeEvent(QResizeEvent *re) override;
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  void mousePressEvent(QMouseEvent *me) override;
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  void mouseMoveEvent(QMouseEvent *me) override;
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  void mouseReleaseEvent(QMouseEvent *me) override;
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  void showEvent(QShowEvent *se) override;
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protected slots:
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  void updateButtonsVisibility();
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  void holdBackward();
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  void holdForward();
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  void releaseBackward();
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  void releaseForward();
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};
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#endif  // DVSCROLLWIDGET_H