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

#ifndef TB_POPUP_WINDOW_H
#define TB_POPUP_WINDOW_H

#include "tb_window.h"
#include "tb_widgets_listener.h"

namespace tb {

/** TBPopupAlignment describes the preferred alignment of a popup
    relative to a target widget or a given point.

    It calculates the rect to be used to match these preferences
    for any given popup and target. */
class TBPopupAlignment
{
public:
    static const int UNSPECIFIED = TB_INVALID_DIMENSION;

    /** Align relative to the target widget. */
    TBPopupAlignment(TB_ALIGN align = TB_ALIGN_BOTTOM)
        : pos_in_root(UNSPECIFIED, UNSPECIFIED)
        , align(align)
        , expand_to_target_width(true) {}

    /** Align relative to the given position (coordinates relative to the root widget). */
    TBPopupAlignment(const TBPoint &pos_in_root, TB_ALIGN align = TB_ALIGN_BOTTOM)
        : pos_in_root(pos_in_root)
        , align(align)
        , expand_to_target_width(true) {}

    /** Align relative to the given position (coordinates relative to the root widget).
        Applies an additional offset. */
    TBPopupAlignment(const TBPoint &pos_in_root, const TBPoint &pos_offset)
        : pos_in_root(pos_in_root)
        , pos_offset(pos_offset)
        , align(TB_ALIGN_BOTTOM)
        , expand_to_target_width(true) {}

    /** Calculate a good rect for the given popup window using its preferred size and
        the preferred alignment information stored in this class. */
    TBRect GetAlignedRect(TBWidget *popup, TBWidget *target) const;

    TBPoint pos_in_root;
    TBPoint pos_offset;

    TB_ALIGN align;
    /** If true, the width of the popup will be at least the same as the target widget
        if the alignment is TB_ALIGN_TOP or TB_ALIGN_BOTTOM. */
    bool expand_to_target_width;
};

/** TBPopupWindow is a popup window that redirects any child widgets events
    through the given target. It will automatically close on click events that
    are not sent through this popup. */

class TBPopupWindow : public TBWindow, private TBWidgetListener
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBPopupWindow, TBWindow);

    TBPopupWindow(TBWidget *target);
    ~TBPopupWindow();

    bool Show(const TBPopupAlignment &alignment);

    virtual TBWidget *GetEventDestination() { return m_target.Get(); }

    virtual bool OnEvent(const TBWidgetEvent &ev);
private:
    TBWidgetSafePointer m_target;
    // TBWidgetListener
    virtual void OnWidgetFocusChanged(TBWidget *widget, bool focused);
    virtual bool OnWidgetInvokeEvent(TBWidget *widget, const TBWidgetEvent &ev);
    virtual void OnWidgetDelete(TBWidget *widget);
    virtual bool OnWidgetDying(TBWidget *widget);
};

}; // namespace tb

#endif // TB_POPUP_WINDOW_H