174 lines
5.3 KiB
C
174 lines
5.3 KiB
C
#ifndef ELM_WIDGET_SCROLLER_H
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#define ELM_WIDGET_SCROLLER_H
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#include "elm_interface_scrollable.h"
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#include "elm_widget_layout.h"
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/**
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* @addtogroup Widget
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* @{
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*
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* @section elm-scroller-class The Elementary Scroller Class
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*
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* Elementary, besides having the @ref Scroller widget, exposes its
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* foundation -- the Elementary Scroller Class -- in order to create
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* other widgets which are a scroller with some more logic on top.
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*/
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/**
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* @def ELM_SCROLLER_CLASS
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*
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* Use this macro to cast whichever subclass of
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* #Elm_Scroller_Smart_Class into it, so to access its fields.
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_CLASS(x) ((Elm_Scroller_Smart_Class *)x)
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/**
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* @def ELM_SCROLLER_DATA
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*
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* Use this macro to cast whichever subdata of
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* #Elm_Scroller_Smart_Data into it, so to access its fields.
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_DATA(x) ((Elm_Scroller_Smart_Data *)x)
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/**
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* @def ELM_SCROLLER_SMART_CLASS_VERSION
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*
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* Current version for Elementary scroller @b base smart class, a value
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* which goes to _Elm_Scroller_Smart_Class::version.
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_SMART_CLASS_VERSION 1
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/**
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* @def ELM_SCROLLER_SMART_CLASS_INIT
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*
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* Initializer for a whole #Elm_Scroller_Smart_Class structure, with
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* @c NULL values on its specific fields.
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*
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* @param smart_class_init initializer to use for the "base" field
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* (#Evas_Smart_Class).
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*
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* @see EVAS_SMART_CLASS_INIT_NULL
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* @see EVAS_SMART_CLASS_INIT_NAME_VERSION
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* @see ELM_SCROLLER_SMART_CLASS_INIT_NULL
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* @see ELM_SCROLLER_SMART_CLASS_INIT_NAME_VERSION
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_SMART_CLASS_INIT(smart_class_init) \
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{smart_class_init, ELM_SCROLLER_SMART_CLASS_VERSION}
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/**
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* @def ELM_SCROLLER_SMART_CLASS_INIT_NULL
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*
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* Initializer to zero out a whole #Elm_Scroller_Smart_Class structure.
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*
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* @see ELM_SCROLLER_SMART_CLASS_INIT_NAME_VERSION
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* @see ELM_SCROLLER_SMART_CLASS_INIT
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_SMART_CLASS_INIT_NULL \
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ELM_SCROLLER_SMART_CLASS_INIT(EVAS_SMART_CLASS_INIT_NULL)
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/**
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* @def ELM_SCROLLER_SMART_CLASS_INIT_NAME_VERSION
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*
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* Initializer to zero out a whole #Elm_Scroller_Smart_Class structure and
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* set its name and version.
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*
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* This is similar to #ELM_SCROLLER_SMART_CLASS_INIT_NULL, but it will
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* also set the version field of #Elm_Scroller_Smart_Class (base field)
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* to the latest #ELM_SCROLLER_SMART_CLASS_VERSION and name it to the
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* specific value.
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*
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* It will keep a reference to the name field as a <c>"const char *"</c>,
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* i.e., the name must be available while the structure is
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* used (hint: static or global variable!) and must not be modified.
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*
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* @see ELM_SCROLLER_SMART_CLASS_INIT_NULL
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* @see ELM_SCROLLER_SMART_CLASS_INIT
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*
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* @ingroup Widget
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*/
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#define ELM_SCROLLER_SMART_CLASS_INIT_NAME_VERSION(name) \
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ELM_SCROLLER_SMART_CLASS_INIT \
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(ELM_LAYOUT_SMART_CLASS_INIT_NAME_VERSION(name))
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/**
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* Elementary scroller base smart class. This inherits directly from
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* #Elm_Layout_Smart_Class and is meant to build widgets extending the
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* behavior of a scroller.
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*
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* All of the functions listed on @ref Scroller namespace will work for
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* objects deriving from #Elm_Scroller_Smart_Class.
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*/
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typedef struct _Elm_Scroller_Smart_Class
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{
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Elm_Layout_Smart_Class base;
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int version; /**< Version of this smart class definition */
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} Elm_Scroller_Smart_Class;
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/**
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* Base widget smart data extended with scroller instance data.
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*/
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typedef struct _Elm_Scroller_Smart_Data Elm_Scroller_Smart_Data;
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struct _Elm_Scroller_Smart_Data
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{
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Elm_Layout_Smart_Data base; /* base widget smart data as
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* first member obligatory, as
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* we're inheriting from it */
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const Elm_Scrollable_Smart_Interface *s_iface;
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Evas_Object *hit_rect;
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Evas_Object *g_layer;
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Evas_Object *content;
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Eina_Bool min_w : 1;
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Eina_Bool min_h : 1;
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};
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/**
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* @}
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*/
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EAPI extern const char ELM_SCROLLER_SMART_NAME[];
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EAPI const Elm_Scroller_Smart_Class *elm_scroller_smart_class_get(void);
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#define ELM_SCROLLER_DATA_GET(o, sd) \
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Elm_Scroller_Smart_Data * sd = evas_object_smart_data_get(o)
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#define ELM_SCROLLER_DATA_GET_OR_RETURN(o, ptr) \
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ELM_SCROLLER_DATA_GET(o, ptr); \
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if (!ptr) \
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{ \
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CRITICAL("No widget data for object %p (%s)", \
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o, evas_object_type_get(o)); \
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return; \
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}
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#define ELM_SCROLLER_DATA_GET_OR_RETURN_VAL(o, ptr, val) \
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ELM_SCROLLER_DATA_GET(o, ptr); \
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if (!ptr) \
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{ \
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CRITICAL("No widget data for object %p (%s)", \
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o, evas_object_type_get(o)); \
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return val; \
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}
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#define ELM_SCROLLER_CHECK(obj) \
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if (!obj || !elm_widget_type_check \
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((obj), ELM_SCROLLER_SMART_NAME, __func__)) \
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return
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#endif
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