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

#ifndef TB_TOGGLE_CONTAINER_H
#define TB_TOGGLE_CONTAINER_H

#include "tb_widgets_common.h"

namespace tb {

/** TBToggleContainer is a widget that toggles a property when its value
    change between 0 and 1. TOGGLE specifies what property will toggle.
    This is useful f.ex to toggle a whole group of child widgets depending
    on the value of some other widget. By connecting the TBToggleContainer
    with a widget connection, this can happen completly automatically. */
class TBToggleContainer : public TBWidget
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBToggleContainer, TBWidget);

    TBToggleContainer();

    /** Defines what should toggle when the value changes. */
    enum TOGGLE {
        TOGGLE_NOTHING,		///< Nothing happens (the default)
        TOGGLE_ENABLED,		///< Enabled/disabled state
        TOGGLE_OPACITY,		///< Opacity 1/0
        TOGGLE_EXPANDED		///< Expanded/collapsed (In parent axis direction)
    };

    /** Set what should toggle when the value changes. */
    void SetToggle(TOGGLE toggle);
    TOGGLE GetToggle() const { return m_toggle; }

    /** Set if the toggle state should be inverted. */
    void SetInvert(bool invert);
    bool GetInvert() const { return m_invert; }

    /** Get the current value, after checking the invert mode. */
    bool GetIsOn() const { return m_invert ? !m_value : !!m_value; }

    /** Set the value of this widget. 1 will turn on the toggle, 0 will turn it off (or
        the opposite if the invert mode is set). */
    virtual void SetValue(int value);
    virtual int GetValue() { return m_value; }

    virtual void OnInflate(const INFLATE_INFO &info);
private:
    void UpdateInternal();
    TOGGLE m_toggle;
    bool m_invert;
    int m_value;
};

/** TBSectionHeader is just a thin wrapper for a TBButton that is in toggle
    mode with the skin TBSectionHeader by default. It is used as the clickable
    header in TBSection that toggles the section. */
class TBSectionHeader : public TBButton
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBSectionHeader, TBButton);

    TBSectionHeader();

    virtual bool OnEvent(const TBWidgetEvent &ev);
};

/** TBSection is a widget with a header that when clicked toggles its children
    on and off (using a internal TBToggleContainer with TOGGLE_EXPANDED).

    The header is a TBSectionHeader.

    The skin names of the internal widgets are:
        TBSection				- This widget itself.
        TBSection.layout		- The layout that wraps the header and the container.
        TBSection.container		- The toggle container with the children that expands/collapses.
*/

class TBSection : public TBWidget
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBSection, TBWidget);

    TBSection();
    ~TBSection();

    TBLayout *GetLayout() { return &m_layout; }
    TBSectionHeader *GetHeader() { return &m_header; }
    TBToggleContainer *GetContainer() { return &m_toggle_container; }

    /** Set if the section should be scrolled into view after next layout. */
    void SetPendingScrollIntoView(bool pending_scroll) { m_pending_scroll = pending_scroll; }

    /** Set the text of the text field. */
    virtual bool SetText(const char *text) { return m_header.SetText(text); }
    virtual bool GetText(TBStr &text) { return m_header.GetText(text); }
    using TBWidget::GetText; ///< Make all versions in base class available.

    virtual void SetValue(int value);
    virtual int GetValue() { return m_toggle_container.GetValue(); }

    // ATOMIC BEGIN
    virtual void AddToggleChild(TBWidget *child, WIDGET_Z z = WIDGET_Z_TOP, WIDGET_INVOKE_INFO info = WIDGET_INVOKE_INFO_NORMAL);
    virtual void AddToggleChildRelative(TBWidget *child, WIDGET_Z_REL z, TBWidget *reference, WIDGET_INVOKE_INFO info = WIDGET_INVOKE_INFO_NORMAL);
    virtual void RemoveToggleChild(TBWidget* child);
    virtual void DeleteAllToggleChildren();
    virtual TBWidget* GetFirstToggleChild();
    virtual TBWidget* GetToggleWidgetById(const TBID &id);
    // ATOMIC END

    virtual TBWidget *GetContentRoot() { return m_toggle_container.GetContentRoot(); }
    virtual void OnProcessAfterChildren();

    virtual PreferredSize OnCalculatePreferredSize(const SizeConstraints &constraints);
private:
    TBLayout m_layout;
    TBSectionHeader m_header;
    TBToggleContainer m_toggle_container;
    bool m_pending_scroll;

    // ATOMIC BEGIN
    TBLayout m_toggle_container_layout;
    // ATOMIC END
};

}; // namespace tb

#endif // TB_TOGGLE_CONTAINER_H