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#pragma once
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#ifndef DOCKLAYOUT_H
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#define DOCKLAYOUT_H
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#include "tcommon.h"
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#include <qwidget></qwidget>
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#include <qaction></qaction>
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#include <deque></deque>
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#include <vector></vector>
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#include <qlayout></qlayout>
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#include <qframe></qframe>
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#include "docklayout.h"
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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 DockLayout;
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class DockWidget;
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class DockPlaceholder;
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class DockSeparator;
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class DockDecoAllocator;
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class Region;
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//========================================================================
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//--------------------------
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//    Docking Lock Check
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//--------------------------
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//! Singleton for docking system lock.
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class DVAPI DockingCheck {
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  bool m_enabled;
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  QAction *m_toggle;
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  DockingCheck() : m_enabled(false), m_toggle(0) {}
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public:
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  static DockingCheck *instance();
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  void setToggle(QAction *toggle);
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  bool isEnabled() const { return m_enabled; }
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  void setIsEnabled(bool on);
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};
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//========================================================================
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//-------------------
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//    Dock Layout
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//-------------------
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//! DockLayout inherits the abstract QLayout to provide a docking system for
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//! widgets.
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/*!
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  \b IMPORTANT NOTE: Observe that the addWidget() method expects only widgets of
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  type DockWidget, so any other
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  widget type added to this kind of Layout will cause a run-time error.
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  \sa DockWidget and DockSeparator classes.
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*/
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class DVAPI DockLayout final : public QLayout {
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  std::vector<qlayoutitem *=""> m_items;</qlayoutitem>
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  std::deque<region *=""> m_regions;</region>
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  DockWidget
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      *m_maximizedDock;  // Let the layout know if there is a maximized widget
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  // Decoration-related allocator (separators)
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  DockDecoAllocator *m_decoAllocator;
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public:
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  DockLayout();
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  virtual ~DockLayout();
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  // QLayout item handling (see Qt reference)
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  int count(void) const override;
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  void addItem(QLayoutItem *item) override;
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  QSize sizeHint() const override;
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  QSize minimumSize() const override;
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  QSize maximumSize() const override;
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  QLayoutItem *itemAt(int) const override;
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  QWidget *widgetAt(int) const;
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  QLayoutItem *takeAt(int) override;
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  void setGeometry(const QRect &rect) override;
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  void update();        // Re-applies partition found
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  void redistribute();  // Calculates partition
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  void applyTransform(const QTransform &transform);  // Applies tranformation to
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                                                     // known parition - Da
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                                                     // rimuovere, non serve...
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  DockWidget *getMaximized() { return m_maximizedDock; }
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  void setMaximized(
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      DockWidget *item,
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      bool state = true);  // Let DockLayout handle maximization requests
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  // Docking and undocking methods.
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  Region *dockItem(DockWidget *item, Region *r = 0, int idx = 0);
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  void dockItem(DockWidget *item, DockPlaceholder *place);
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  void dockItem(DockWidget *item, DockWidget *target, int regionSide);
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  bool undockItem(DockWidget *item);
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  void calculateDockPlaceholders(DockWidget *item);
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  // Query methods
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  Region *rootRegion() const {
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    return m_regions.size() ? m_regions.front() : 0;
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  }
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  const std::deque<region *=""> ®ions() const { return m_regions; }</region>
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  Region *region(int i) const { return m_regions[i]; }
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  Region *find(DockWidget *item) const;
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  QWidget *containerOf(QPoint point) const;
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  // Save and load DockLayout states
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  typedef std::pair<std::vector<qrect>, QString> State;</std::vector<qrect>
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  State saveState();
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  bool restoreState(const State &state);
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  // Decorations allocator
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  void setDecoAllocator(DockDecoAllocator *decoAllocator);
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private:
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  void applyGeometry();
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  inline void updateSeparatorCursors();
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  Region *dockItemPrivate(DockWidget *item, Region *r, int idx);
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  // Insertion and removal check - called internally by dock/undockItem
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  bool isPossibleInsertion(DockWidget *item, Region *parentRegion,
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                           int insertionIdx);
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  bool isPossibleRemoval(DockWidget *item, Region *parentRegion,
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                         int removalIdx);
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  // Internal save function
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  void writeRegion(Region *r, QString &hierarchy);
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};
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//========================================================================
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//-----------------------
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//    Dock Widget
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//-----------------------
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//! Dockable widgets are widget containers handled by DockLayout class.
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/*!
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  DockLayouts accept only dock widgets of this class; so if you want to
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  place a given widget under this kind of layout, a DockWidget shell for
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  it must be allocated first. The following class implements base dock
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  widgets, with native floating decorations and no docked title bar.
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  It is encouraged to reimplement all the essential functions for custom aspect
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  and behaviour.
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  \sa DockLayout and DockPlaceholder classes.
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*/
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class DVAPI DockWidget : public QFrame {
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  friend class DockLayout;  // DockLayout is granted access to placeholders'
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                            // privates
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  friend class DockPlaceholder;  // As above.
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  // friend Region;          //Regions need access to m_saveIndex field.
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public:
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  void maximizeDock();
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  bool getCanFixWidth() { return m_canFixWidth; }
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  void setCanFixWidth(bool fixed) { m_canFixWidth = fixed; }
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protected:
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  // Private attributes for dragging purposes
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  bool m_floating;   // Whether this window is floating or docked
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  bool m_dragging;   // Whether this window is being dragged
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  bool m_undocking;  // Still docked, but after a mouse button press on a title
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                     // bar.
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  // NOTE: m_dragging ==> !m_undocking; m_dragging=>m_floating.
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  // Private infos for resizing purposes
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  bool m_resizing;   // Whether this window is being resized
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  int m_marginType;  // Type of resize to consider
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  // Maximization
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  bool m_maximized;
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  // Level Strip and Style Editor use a fixed width on 
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  // window resize to minimize user frustration
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  // This variable is only used by Level Strip right now.
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  // This is only true if the level strip is vertical.
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  bool m_canFixWidth = false;
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private:
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  QPoint m_dragInitialPos;
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  QPoint m_dragMouseInitialPos;
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  // Widget and Layout links
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  DockLayout *m_parentLayout;
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  // Decoration-related allocator (placeholders)
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  DockDecoAllocator *m_decoAllocator;
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  int m_saveIndex;
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protected:
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  // Protected infos for docking purposes
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  std::vector<dockplaceholder *=""> m_placeholders;</dockplaceholder>
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  DockPlaceholder *m_selectedPlace;
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public:
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  DockWidget(QWidget *parent = 0, Qt::WindowFlags flags = Qt::Tool);
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  virtual ~DockWidget();
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  // Returns the DockLayout owning \b this dock widget
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  DockLayout *parentLayout() const { return m_parentLayout; }
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  bool isFloating() const { return m_floating; }
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  bool isMaximized() const { return m_maximized; }
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  // Query functions
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  QWidget *hoveredWidget(QMouseEvent *me);
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  DockPlaceholder *placeAdjacentTo(DockWidget *dockWidget, int boundary);
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  DockPlaceholder *placeOfSeparator(DockSeparator *);
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  const std::vector<dockplaceholder *=""> &placeholders() const {</dockplaceholder>
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    return m_placeholders;
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  }
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  // Re-implementable functions for custom dock widgets.
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  //! Returns the minimum size of the dock widget when docked. This function
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  //! should be
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  //! reimlemented whenever minimum size changes between floating and docked
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  //! appearance.
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  virtual QSize getDockedMinimumSize() { return minimumSize(); }
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  //! Returns the maximum size of the dock widget when docked. This function
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  //! should be
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  //! reimlemented whenever minimum size changes between floating and docked
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  //! appearance.
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  virtual QSize getDockedMaximumSize() { return maximumSize(); }
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  //! This function is called in order to show the dock widget in its floating
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  //! status. No show() or update()
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  //! is needed in its body.
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  //! It can be reimplemented to build custom-styled dock widgets.
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  virtual void setFloatingAppearance() { setWindowFlags(Qt::Tool); }
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  //! This function is called in order to show the dock widget in its docked
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  //! status. No show() or update()
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  //! is needed in its body.
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  //! It can be reimplemented to build custom-styled dock widgets.
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  virtual void setDockedAppearance() {}
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  virtual bool isDragGrip(QPoint p);
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  virtual int isResizeGrip(QPoint) {
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    return 0;  // Native deco widgets handle margins and resizes on their own
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  }
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  enum {
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    leftMargin   = 0x1,
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    rightMargin  = 0x2,
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    topMargin    = 0x4,
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    bottomMargin = 0x8
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  };
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  // Placeholders-related methods
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  virtual void selectDockPlaceholder(QMouseEvent *me);
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  void clearDockPlaceholders();
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  // Decorations allocator
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  void setDecoAllocator(DockDecoAllocator *decoAllocator);
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  // reimpremented in FlipbookPanel
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  virtual void onDock(bool docked) {}
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private:
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  // Event handling
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  // Basic events
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  bool event(QEvent *e) override;
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  void mousePressEvent(QMouseEvent *me) override;
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  void mouseReleaseEvent(QMouseEvent *me) override;
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  void mouseMoveEvent(QMouseEvent *me) override;
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  void hoverMoveEvent(QHoverEvent *he);
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protected:
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  // Customizable events
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  void wheelEvent(QWheelEvent *we) override;
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  void mouseDoubleClickEvent(QMouseEvent *me) override;
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  virtual void windowTitleEvent(QEvent *) {}
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};
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//========================================================================
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//---------------------
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//    DockSeparator
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//---------------------
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//! Separators are interposition widgets among docked DockWidgets of a
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//! DockLayout.
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/*!
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  A DockSeparator has the role of separating sister Regions; it is always owned
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  by a parent
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  Region and inherits its subdivision (here separation) direction. It also
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  provides basical
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  interaction with the user, allowing itself to be shifted along separation
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  direction until
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  geometric constraints are met.
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  DockSeparator class can be inherited to build custom separators - in that
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  case, a
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  heir of DockDecoAllocator class allocating the new separator class must be
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  assigned to
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  the DockLayout.
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  It is also possible to specify the Separators' thickness used in a DockLayout
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  through the
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  QLayout::setSpacing(int) method.
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  \b NOTE: Observe that Separators' geometry is owned by the DockLayout to which
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  it belongs; it
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  is discouraged (but not forbidden) to manually modify it. You may, for
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  example, modify the
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  geometry of a DockSeparator when dragging a dock widget over it.
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  In any case, the layout will automatically regenerate Separators' geometry at
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  each update of
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  the layout.
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  \sa DockLayout and DockWidget classes.
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*/
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class DockSeparator : public QWidget {
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  friend class DockLayout;  // Layout updates each DockSeparator during
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                            // DockLayout::applyGeometry()
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  friend class Region;      // Region may update a DockSeparator's parent during
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                            // removeItem()
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  DockLayout *m_owner;
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  // Event-related infos
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  bool m_pressed;
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  QPoint m_oldOrigin;
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  QPoint m_oldPos;
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  // Structural infos
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  Region *m_parentRegion;
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  int m_index;
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  bool m_orientation;
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  // Constraint infos
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  double m_leftBound;
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  double m_rightBound;
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public:
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  DockSeparator(DockLayout *owner, bool orientation, Region *parentRegion);
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  virtual ~DockSeparator() {}
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  // Structural getters
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  bool getOrientation() const { return m_orientation; }
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  Region *getParentRegion() const { return m_parentRegion; }
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  int getIndex() const { return m_index; }
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  // Public setters
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  void shift(int dx);
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private:
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  void calculateBounds();
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  void mousePressEvent(QMouseEvent *me) override;
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  void mouseReleaseEvent(QMouseEvent *me) override;
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  void mouseMoveEvent(QMouseEvent *me) override;
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};
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//========================================================================
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//---------------------------
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//    Dock Placeholder
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//---------------------------
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//! A dock placeholder contains the necessary informations about a possible
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//! docking solution.
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/*!
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  Dock placeholders are top-level widgets used by a DockLayout to draw docking
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  solutions for a dragged DockWidget. They are actually generated when
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  dragging of a DockWidget begins: if it belongs to a parent DockLayout, docking
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  possibilities are calculated and stored into the layout.
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  Placeholders selection and activation depend on the dragged dock window and
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  therefore
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  are of its own responsibility.
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  You may, however, inherit this class to provide custom placeholders; in this
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  case,
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  a DockDecoAllocator class reimplementing allocation of placeholders must be
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  assigned to
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  the owner dock widget.
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  \sa DockLayout and DockWidget classes
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*/
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class DockPlaceholder : public QWidget {
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  friend class DockLayout;  // DockLayout is granted access to placeholders'
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                            // privates
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  // Docking informations - private
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  Region *m_region;
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  int m_idx;
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  // Docking informations - public
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  int m_attributes;
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  // Owner
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  DockSeparator *m_separator;
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  DockWidget *m_owner;
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public:
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  DockPlaceholder(DockWidget *owner, Region *r, int idx, int attributes = 0);
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  virtual ~DockPlaceholder() {}
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  // Member access methods
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  //! Returns DockSeparator on which docking takes place (if any)
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  DockSeparator *getSeparator() const;
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  //! Returns dockWidget owner
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  DockWidget *getDockWidget() const { return m_owner; }
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  //! Returns Region owner
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  Region *getParentRegion() const { return m_region; }
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  //! Returns insertion index into parent region
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  int getInsertionIdx() const { return m_idx; }
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  enum {
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    left    = 0,
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    right   = 1,
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    top     = 2,
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    bottom  = 3,
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    sepHor  = 4,
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    sepVert = 5,
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    root    = 6
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  };
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  int getAttribute() const { return m_attributes; }
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  void setAttribute(int attribute) { m_attributes = attribute; }
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  // Geometry functions
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  QRect parentGeometry() const;
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  virtual void buildGeometry();
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  // Query functions
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  //! A root placeholder is passed only if no item is currently docked (special
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  //! case)
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  bool isRoot() const { return m_attributes == root; }
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  DockPlaceholder *parentPlaceholder();
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  DockPlaceholder *greatestPlaceholder();
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  DockPlaceholder *childPlaceholder(QPoint p);
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  DockPlaceholder *smallestPlaceholder(QPoint p);
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private:
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  //! Let wheel events also be propagated to owner dock widget
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  void wheelEvent(QWheelEvent *we) override { m_owner->wheelEvent(we); }
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};
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//===========================================
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//--------------------
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//    Class Region
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//--------------------
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//! Regions represent any rectangular space inside a DockLayout.
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//! Normally there is no reason to deal with Regions, unless you want to
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//! build complex docking systems or manually dock widgets into your code.
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/*!
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  Regions are rectangular areas of the DockLayout's contentsRect() which
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  can be either subdiveded into subRegions (all in a given \b subdivision
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  \b direction) or contain a DockWidget.
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  Every subRegion, if present, has opposite subdivision direction with
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  respect to parent one. In addition, regions possess lists of separators
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  and placeholders found along its subdivision direction.
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  Region informations are owned by the DockLayout who allocates it; however,
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  they are read-only accessible by the user.
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  \sa DockLayout, DockWidget, DockSeparator and DockPlaceholder classes.
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*/
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class Region {
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  friend class DockLayout;     // Layout is the main operating class over
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                               // rectangular regions - need full access
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  friend class DockSeparator;  // Separators need access to extremal sizes
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                               // methods when moving themselves
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  DockLayout *m_owner;
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  DockWidget *m_item;
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  Region *m_parent;
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  std::deque<region *=""> m_childList;</region>
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  std::deque<dockseparator *=""> m_separators;</dockseparator>
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  std::vector<dockplaceholder *=""> m_placeholders;</dockplaceholder>
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  QRectF m_rect;
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  bool m_orientation;
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  int m_minimumSize[2];
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  int m_maximumSize[2];
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  int m_saveIndex;
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public:
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  Region(DockLayout *owner, DockWidget *item = 0)
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      : m_owner(owner), m_item(item), m_parent(0), m_orientation(0) {}
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  ~Region();
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  enum { inf = 1000000 };
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  enum { horizontal = 0, vertical = 1 };
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  enum { left = 0x1, right = 0x2, top = 0x4, bottom = 0x8 };
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  // Getters - public
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  bool getOrientation() const { return m_orientation; }
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  QRectF getGeometry() const { return m_rect; }
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  QSizeF getSize() const { return QSizeF(m_rect.width(), m_rect.height()); }
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  Region *getParent() const { return m_parent; }
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  DockWidget *getItem() const { return m_item; }
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  const std::deque<region *=""> &getChildList() const { return m_childList; }</region>
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  Region *childRegion(int i) const { return m_childList[i]; }
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  const std::deque<dockseparator *=""> &separators() const { return m_separators; }</dockseparator>
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  DockSeparator *separator(int i) const { return m_separators[i]; }
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  std::vector<dockplaceholder *=""> &placeholders() { return m_placeholders; }</dockplaceholder>
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  DockPlaceholder *placeholder(int i) const { return m_placeholders[i]; }
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  unsigned int find(const Region *subRegion) const;
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  bool checkWidgetsToBeFixedWidth(std::vector<qwidget *=""> &widgets);</qwidget>
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private:
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  // Setters - private
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  void setOrientation(bool orientation) { m_orientation = orientation; }
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  void setGeometry(const QRectF &rect) { m_rect = rect; }
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  void setSize(const QSizeF &size) { m_rect.setSize(size); }
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  void setParent(Region *parent) { m_parent = parent; }
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  void setItem(DockWidget *item) { m_item = item; }
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  // Insertion and removal methods
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  void insertSubRegion(Region *subregion, int idx);
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  Region *insertItem(DockWidget *item, int idx);
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  void removeItem(DockWidget *item);
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  void insertSeparator(DockSeparator *sep);
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  void removeSeparator();
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  // Extremal region sizes
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  //! Returns cached occupied space in \b this region along given \b direction.
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  inline int getMaximumSize(bool direction) const {
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    return m_maximumSize[direction];
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  }
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  //! Returns cached occupied space in \b this region along given \b direction.
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  inline int getMinimumSize(bool direction) const {
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    return m_minimumSize[direction];
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  }
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  bool addItemSize(DockWidget *item);
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  bool subItemSize(DockWidget *item);
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  void calculateExtremalSizes();
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  int calculateMinimumSize(bool direction, bool recalcChildren);
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  int calculateMaximumSize(bool direction, bool recalcChildren);
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  // Redistribution function.
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  // The main feature of a Region consists of the redistribute() method, which
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  // extracts the optimal layout among the branching regions with \b this
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  // root. However, only the full redistribute() method in DockLayout is made
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  // public.
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  void redistribute();
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  void restoreGeometry();
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  // void updateSeparators();
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};
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//========================================================================
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//----------------------
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//    Dock Allocator
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//----------------------
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//! DockDecoAllocator class handles the allocation of decoration elements used
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//! by our dock manager.
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/*!
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  In order to implement custom appearances for the docking system, it
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  is possible to customize both DockSeparator and DockPlaceholder classes. Since
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  allocation of such objects is handled internally by the docking system,
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  it is necessary to reimplement allocator functions whenever decoration
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  classes change.
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  In order to assign a DockDecoAllocator to a DockLayout or DockWidget, the
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  respective 'setDecoAllocator' methods are provided.
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  \sa DockLayout, DockWidget, DockSeparator and DockPlaceholder classes.
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*/
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class DockDecoAllocator {
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  friend class DockLayout;
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public:
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  DockDecoAllocator() {}
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  virtual ~DockDecoAllocator() {}
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  // Customizabile allocators
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  virtual DockSeparator *newSeparator(DockLayout *owner, bool orientation,
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                                      Region *parentRegion);
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  virtual DockPlaceholder *newPlaceholder(DockWidget *owner, Region *r, int idx,
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                                          int attributes);
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private:
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  DockPlaceholder *newPlaceBuilt(DockWidget *owner, Region *r, int idx,
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                                 int attributes);
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};
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#endif  // SIMPLEQTTEST_H