// ================================================================================
// ==      This file is a part of Turbo Badger. (C) 2011-2014, Emil Segerås      ==
// ==                     See tb_core.h for more information.                    ==
// ================================================================================

#ifndef TB_TAB_CONTAINER_H
#define TB_TAB_CONTAINER_H

#include "tb_widgets_common.h"

namespace tb {

class TBTabContainer;

/** TBTabLayout is a TBLayout used in TBTabContainer to apply
    some default properties on any TBButton added to it. */
class TBTabLayout : public TBLayout
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBTabLayout, TBLayout);

    TBTabLayout(TBTabContainer *tabContainer) 
        : tabContainer_(tabContainer) {}

    virtual void OnChildAdded(TBWidget *child);
    virtual void OnChildRemove(TBWidget *child);

    virtual PreferredSize OnCalculatePreferredContentSize(const SizeConstraints &constraints);
private:
    TBTabContainer *tabContainer_;
};

/** TBTabContainer - A container with tabs for multiple pages. */

class TBTabContainer : public TBWidget
{
    friend class TBTabLayout;
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBTabContainer, TBWidget);

    TBTabContainer();
    ~TBTabContainer();

    /** Set along which axis the content should layouted.
        Use SetAlignment instead for more choice! Also, calling
        SetAxis directly does not update the current alignment. */
    virtual void SetAxis(AXIS axis);
    virtual AXIS GetAxis() const { return m_root_layout.GetAxis(); }

    /** Set alignment of the tabs. */
    void SetAlignment(TB_ALIGN align);
    TB_ALIGN GetAlignment() const { return m_align; }

    /** Set which page should be selected and visible. */
    virtual void SetValue(int value);
    virtual int GetValue() { return m_current_page; }

    /** Set which page should be selected and visible. */
    void SetCurrentPage(int index) { SetValue(index); }
    int GetCurrentPage() { return GetValue(); }
    int GetNumPages();

    /** Return the widget that is the current page, or nullptr if none is active. */
    TBWidget *GetCurrentPageWidget() const;

    virtual void OnInflate(const INFLATE_INFO &info);
    virtual bool OnEvent(const TBWidgetEvent &ev);
    virtual void OnProcess();

    virtual TBWidget *GetContentRoot() { return &m_content_root; }
    TBLayout *GetTabLayout() { return &m_tab_layout; }
protected:
    TBLayout m_root_layout;
    TBTabLayout m_tab_layout;
    TBWidget m_content_root;
    bool m_need_page_update;
    int m_current_page;
    TB_ALIGN m_align;
};

};

#endif // TB_TAB_CONTAINER_H