Summary:
fileselector_button and fileselector_entry should have almost same interfaces with fileselector.
Previously , we exposed them individually such as elm_fileselector_is_save_set().
Instead of adding the same APIs three times, we can reuse one fileselector's API using Eo interface.
This patch introduced fileselector interface and applied it to elm_fileselector.
Reviewers: seoz, raster
Reviewed By: raster
Differential Revision: https://phab.enlightenment.org/D475
fileselector_button initialize inwin mode using the configuration.
Fixed wrong information about default value in API documentation.
In addition, fixed test_fileselector_button.cpp not to show wrong information at initial time.
elm_widget_type_get() is not lowercase anymoe, rather "Elm_Win". As
other parts of the elementary source were using evas_object_type_get()
use it, and it still returns the legacy lowercase name.