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

#ifndef TB_WIDGET_ANIMATION_H
#define TB_WIDGET_ANIMATION_H

#include "../tb_widgets_listener.h"
#include "../animation/tb_animation.h"

namespace tb {

/** Don't use 0.0 for opacity animations since that may break focus code.
    At the moment a window should appear and start fading in from opacity 0,
    it would also attempt setting the focus to it, but if opacity is 0 it will
    think focus should not be set in that window and fail. */
#define TB_ALMOST_ZERO_OPACITY 0.001f

/** Base class for widget animations. This animation object will
    be deleted automatically if the widget is deleted. */
class TBWidgetAnimationObject : public TBAnimationObject, public TBLinkOf<TBWidgetAnimationObject>
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBWidgetAnimationObject, TBAnimationObject);

    TBWidgetAnimationObject(TBWidget *widget);
    virtual ~TBWidgetAnimationObject();
public:
    TBWidget *m_widget;
};

/** Animate the opacity of the target widget. */
class TBWidgetAnimationOpacity : public TBWidgetAnimationObject
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBWidgetAnimationOpacity, TBWidgetAnimationObject);

    TBWidgetAnimationOpacity(TBWidget *widget, float src_opacity, float dst_opacity, bool die);
    virtual void OnAnimationStart();
    virtual void OnAnimationUpdate(float progress);
    virtual void OnAnimationStop(bool aborted);
private:
    float m_src_opacity;
    float m_dst_opacity;
    bool m_die;
};

/** Animate the rectangle of the target widget. */
class TBWidgetAnimationRect : public TBWidgetAnimationObject
{
public:
    // For safe typecasting
    TBOBJECT_SUBCLASS(TBWidgetAnimationRect, TBWidgetAnimationObject);

    enum MODE {
        /** Animate from source to dest. */
        MODE_SRC_TO_DST,
        /** Animate from current + delta to current. */
        MODE_DELTA_IN,
        /** Animate from current to current + delta. */
        MODE_DELTA_OUT
    };
    /** Animate the widget between the given source and dest rectangle. */
    TBWidgetAnimationRect(TBWidget *widget, const TBRect &src_rect, const TBRect &dst_rect);
    /** Animate the widget between rectangles based on the current widget
        rectangle and a delta. The reference rectangle will be taken from
        the target widget on the first OnAnimationUpdate. */
    TBWidgetAnimationRect(TBWidget *widget, const TBRect &delta_rect, MODE mode);
    virtual void OnAnimationStart();
    virtual void OnAnimationUpdate(float progress);
    virtual void OnAnimationStop(bool aborted);
private:
    TBRect m_src_rect;
    TBRect m_dst_rect;
    TBRect m_delta_rect;
    MODE m_mode;
};

class TBWidgetsAnimationManager : public TBWidgetListener
{
public:
    /** Init the widgets animation manager. */
    static void Init();

    /** Shutdown the widgets animation manager. */
    static void Shutdown();

    /** Abort all animations that are running for the given widget. */
    static void AbortAnimations(TBWidget *widget);

    /** Abort all animations matching the given type that are running for the given widget.
        This example will abort all opacity animations:
            AbortAnimations(widget, TBTypedObject::GetTypeId<TBWidgetAnimationOpacity>()) */
    static void AbortAnimations(TBWidget *widget, TB_TYPE_ID type_id);

private:
    // == TBWidgetListener ==================
    virtual void OnWidgetDelete(TBWidget *widget);
    virtual bool OnWidgetDying(TBWidget *widget);
    virtual void OnWidgetAdded(TBWidget *parent, TBWidget *child);
    virtual void OnWidgetRemove(TBWidget *parent, TBWidget *child);
};

}; // namespace tb

#endif // TB_WIDGET_ANIMATION_H