* @defgroup Elm_Progressbar Progress bar
* @ingroup Elementary
* @image html progressbar_inheritance_tree.png
* @image latex progressbar_inheritance_tree.eps
* The progress bar is a widget for visually representing the
* progress status of a given job/task.
* A progress bar may be horizontal or vertical. It may display an
* icon besides it, as well as primary and @b units labels. The
* former is meant to label the widget as a whole, while the
* latter, which is formatted with floating point values (and thus
* accepts a <c>printf</c>-style format string, like <c>"%1.2f
* units"</c>), is meant to label the widget's <b>progress
* value</b>. Label, icon and unit strings/objects are @b optional
* for progress bars.
* A progress bar may be @b inverted, in which case it gets its
* values inverted, i.e., high values being on the left or top and
* low values on the right or bottom, for horizontal and vertical modes
* The @b span of the progress, as set by
* elm_progressbar_span_size_set(), is its length (horizontally or
* vertically), unless one puts size hints on the widget to expand
* on desired directions, by any container. That length will be
* scaled by the object or applications scaling factor.
* Applications can query the progress bar for its value with
* This widget inherits from the @ref Layout one, so that all the
* functions acting on it also work for progress bar objects.
* This widget emits the following signals, besides the ones sent from
* @ref Layout:
* @li @c "changed" - when the value is changed (since 1.7)
* @li @c "focused" - When the progressbar has received focus. (since 1.8)
* @li @c "unfocused" - When the progressbar has lost focus. (since 1.8)
* @li @c "language,changed" - the program's language changed (since 1.9)
* This widget has the following styles:
* - @c "default"
* - @c "wheel" (simple style, no text, no progression, only
* "pulse" effect is available)
* Default content parts of the progressbar widget that you can use for are:
* @li "icon" - An icon of the progressbar
* Default text parts of the progressbar widget that you can use for are:
* @li "default" - A label of the progressbar
* Supported elm_object common APIs.
* @li @ref elm_object_part_text_set
* @li @ref elm_object_part_text_get
* @li @ref elm_object_part_content_set
* @li @ref elm_object_part_content_get
* @li @ref elm_object_part_content_unset
* Here is an example on its usage:
* @li @ref progressbar_example