/**
 * @defgroup Clock Clock
 * @ingroup Elementary
 *
 * @image html img/widget/clock/preview-00.png
 * @image latex img/widget/clock/preview-00.eps
 *
 * This is a @b digital clock widget. In its default theme, it has a
 * vintage "flipping numbers clock" appearance, which will animate
 * sheets of individual algarisms individually as time goes by.
 *
 * A newly created clock will fetch system's time (already
 * considering local time adjustments) to start with, and will tick
 * accordingly. It may or may not show seconds.
 *
 * Clocks have an @b edition  mode. When in it, the sheets will
 * display extra arrow indications on the top and bottom and the
 * user may click on them to raise or lower the time values. After
 * it's told to exit edition mode, it will keep ticking with that
 * new time set (it keeps the difference from local time).
 *
 * Also, when under edition mode, user clicks on the cited arrows
 * which are @b held for some time will make the clock to flip the
 * sheet, thus editing the time, continuously and automatically for
 * the user. The interval between sheet flips will keep growing in
 * time, so that it helps the user to reach a time which is distant
 * from the one set.
 *
 * The time display is, by default, in military mode (24h), but an
 * am/pm indicator may be optionally shown, too, when it will
 * switch to 12h.
 *
 * This widget inherits from the @ref Layout one, so that all the
 * functions acting on it also work for clock objects.
 *
 * This widget emits the following signals, besides the ones sent from
 * @ref Layout:
 * - @c "changed" - the clock's user changed the time
 *
 * Supported elm_object common APIs.
 * @li @ref elm_object_signal_emit
 * @li @ref elm_object_signal_callback_add
 * @li @ref elm_object_signal_callback_del
 *
 * Here is an example on its usage:
 * @li @ref clock_example
 */

/**
 * @addtogroup Clock
 * @{
 */

/**
 * Identifiers for which clock digits should be editable, when a
 * clock widget is in edition mode. Values may be OR-ed together to
 * make a mask, naturally.
 *
 * @see elm_clock_edit_set()
 * @see elm_clock_edit_mode_set()
 */
typedef enum
{
   ELM_CLOCK_EDIT_DEFAULT = 0, /**< Default value. Means that all digits are editable, when in edition mode. */
   ELM_CLOCK_EDIT_HOUR_DECIMAL = 1 << 0, /**< Decimal algarism of hours value should be editable */
   ELM_CLOCK_EDIT_HOUR_UNIT = 1 << 1, /**< Unit algarism of hours value should be editable */
   ELM_CLOCK_EDIT_MIN_DECIMAL = 1 << 2, /**< Decimal algarism of minutes value should be editable */
   ELM_CLOCK_EDIT_MIN_UNIT = 1 << 3, /**< Unit algarism of minutes value should be editable */
   ELM_CLOCK_EDIT_SEC_DECIMAL = 1 << 4, /**< Decimal algarism of seconds value should be editable */
   ELM_CLOCK_EDIT_SEC_UNIT = 1 << 5, /**< Unit algarism of seconds value should be editable */
   ELM_CLOCK_EDIT_ALL = (1 << 6) - 1 /**< All digits should be editable */
} Elm_Clock_Edit_Mode;

/**
 * Add a new clock widget to the given parent Elementary
 * (container) object
 *
 * @param parent The parent object
 * @return a new clock widget handle or @c NULL, on errors
 *
 * This function inserts a new clock widget on the canvas.
 *
 * @ingroup Clock
 */
EAPI Evas_Object      *elm_clock_add(Evas_Object *parent);

/**
 * Set a clock widget's time, programmatically
 *
 * @param obj The clock widget object
 * @param hrs The hours to set
 * @param min The minutes to set
 * @param sec The seconds to set
 *
 * This function updates the time that is showed by the clock
 * widget.
 *
 *  Values @b must be set within the following ranges:
 * - 0 - 23, for hours
 * - 0 - 59, for minutes
 * - 0 - 59, for seconds,
 *
 * even if the clock is not in "military" mode.
 *
 * @warning The behavior for values set out of those ranges is @b
 * undefined.
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_time_set(Evas_Object *obj, int hrs, int min, int sec);

/**
 * Get a clock widget's time values
 *
 * @param obj The clock object
 * @param[out] hrs Pointer to the variable to get the hours value
 * @param[out] min Pointer to the variable to get the minutes value
 * @param[out] sec Pointer to the variable to get the seconds value
 *
 * This function gets the time set for @p obj, returning
 * it on the variables passed as the arguments to function
 *
 * @note Use @c NULL pointers on the time values you're not
 * interested in: they'll be ignored by the function.
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_time_get(const Evas_Object *obj, int *hrs, int *min, int *sec);

/**
 * Set whether a given clock widget is under <b>edition mode</b> or
 * under (default) displaying-only mode.
 *
 * @param obj The clock object
 * @param edit @c EINA_TRUE to put it in edition, @c EINA_FALSE to
 * put it back to "displaying only" mode
 *
 * This function makes a clock's time to be editable or not <b>by
 * user interaction</b>. When in edition mode, clocks @b stop
 * ticking, until one brings them back to canonical mode. The
 * elm_clock_edit_mode_set() function will influence which digits
 * of the clock will be editable.
 *
 * @note am/pm sheets, if being shown, will @b always be editable
 * under edition mode.
 *
 * @see elm_clock_edit_get()
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_edit_set(Evas_Object *obj, Eina_Bool edit);

/**
 * Retrieve whether a given clock widget is under editing mode
 * or under (default) displaying-only mode.
 *
 * @param obj The clock object
 * @return @c EINA_TRUE, if it's in edition mode, @c EINA_FALSE otherwise
 *
 * This function retrieves whether the clock's time can be edited
 * or not by user interaction.
 *
 * @see elm_clock_edit_set() for more details
 *
 * @ingroup Clock
 */
EAPI Eina_Bool         elm_clock_edit_get(const Evas_Object *obj);

/**
 * Set what digits of the given clock widget should be editable
 * when in edition mode.
 *
 * @param obj The clock object
 * @param digedit Bit mask indicating the digits to be editable
 * (values in #Elm_Clock_Edit_Mode).
 *
 * @see elm_clock_edit_mode_get()
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_edit_mode_set(Evas_Object *obj, Elm_Clock_Edit_Mode digedit);

/**
 * Retrieve what digits of the given clock widget should be
 * editable when in edition mode.
 *
 * @param obj The clock object
 * @return Bit mask indicating the digits to be editable
 * (values in #Elm_Clock_Edit_Mode).
 *
 * @see elm_clock_edit_mode_set() for more details
 *
 * @ingroup Clock
 */
EAPI Elm_Clock_Edit_Mode elm_clock_edit_mode_get(const Evas_Object *obj);

/**
 * Set if the given clock widget must show hours in military or
 * am/pm mode
 *
 * @param obj The clock object
 * @param am_pm @c EINA_TRUE to put it in am/pm mode, @c EINA_FALSE
 * to military mode
 *
 * This function sets if the clock must show hours in military or
 * am/pm mode. In some countries like Brazil the military mode
 * (00-24h-format) is used, in opposition to the USA, where the
 * am/pm mode is more commonly used.
 *
 * @see elm_clock_show_am_pm_get()
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_show_am_pm_set(Evas_Object *obj, Eina_Bool am_pm);

/**
 * Get if the given clock widget shows hours in military or am/pm
 * mode
 *
 * @param obj The clock object
 * @return @c EINA_TRUE, if in am/pm mode, @c EINA_FALSE if in
 * military
 *
 * This function gets if the clock shows hours in military or am/pm
 * mode.
 *
 * @see elm_clock_show_am_pm_set() for more details
 *
 * @ingroup Clock
 */
EAPI Eina_Bool         elm_clock_show_am_pm_get(const Evas_Object *obj);

/**
 * Set if the given clock widget must show time with seconds or not
 *
 * @param obj The clock object
 * @param seconds @c EINA_TRUE to show seconds, @c EINA_FALSE otherwise
 *
 * This function sets if the given clock must show or not elapsed
 * seconds. By default, they are @b not shown.
 *
 * @see elm_clock_show_seconds_get()
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_show_seconds_set(Evas_Object *obj, Eina_Bool seconds);

/**
 * Get whether the given clock widget is showing time with seconds
 * or not
 *
 * @param obj The clock object
 * @return @c EINA_TRUE if it's showing seconds, @c EINA_FALSE otherwise
 *
 * This function gets whether @p obj is showing or not the elapsed
 * seconds.
 *
 * @see elm_clock_show_seconds_set()
 *
 * @ingroup Clock
 */
EAPI Eina_Bool         elm_clock_show_seconds_get(const Evas_Object *obj);

/**
 * Set the first interval on time updates for a user mouse button hold
 * on clock widgets' time edition.
 *
 * @param obj The clock object
 * @param interval The first interval value in seconds
 *
 * This interval value is @b decreased while the user holds the
 * mouse pointer either incrementing or decrementing a given the
 * clock digit's value.
 *
 * This helps the user to get to a given time distant from the
 * current one easier/faster, as it will start to flip quicker and
 * quicker on mouse button holds.
 *
 * The calculation for the next flip interval value, starting from
 * the one set with this call, is the previous interval divided by
 * 1.05, so it decreases a little bit.
 *
 * The default starting interval value for automatic flips is
 * @b 0.85 seconds.
 *
 * @see elm_clock_first_interval_get()
 *
 * @ingroup Clock
 */
EAPI void              elm_clock_first_interval_set(Evas_Object *obj, double interval);

/**
 * Get the first interval on time updates for a user mouse button hold
 * on clock widgets' time edition.
 *
 * @param obj The clock object
 * @return The first interval value, in seconds, set on it
 *
 * @see elm_clock_first_interval_set() for more details
 *
 * @ingroup Clock
 */
EAPI double            elm_clock_first_interval_get(const Evas_Object *obj);

/**
 * @}
 */