Tizen Developers

Hi,

I don't face such direct way to change the button's background color. 

You can try to use the image button as a workaround.

Another, as button is inherit from the layout, possible you can define a customer style for button, example an edc group with bg part and text part. Then use the api elm_layout_file_set() to set the customized style on the button.

Additional info, regarding how to customizing widgets, https://developer.tizen.org/documentation/guides/native-application/ui/ui-control/widget-preferences#customize

I am crosslinking it to :

http://stackoverflow.com/questions/24730499/how-to-add-background-to-elementaryefl-widget

Also villains from IRC asked " Could there be a *_user_style_push() function added to buttons and labels, like entry has?"

Unfortunately it is impossible to change the color of the default button on Tizen 2.4 because button color is hardcoded in the default button theme. This issue will be fixed in Tizen 3.0 by introducing color_classes into the theme which will allow you to use edje_object_color_class_set() API (or similar new API) to change colors used in standard widget. On Tizen 2.4 however you need to implement your own button style for this. This can be done by implementing EDC group named "elm/button/base/your_button", adding your extension to the theme:

elm_theme_extension_add(nullptr, "path_to_your_theme.edj");

and setting your style to the button:

Evas_Object *button = elm_button_add(parent);
elm_object_style_set(button, "your_button");

Implementing your own style is not a simple task. You have to be familiar with EDC and also there are some undocumented features that your implementation should have such as a program to pass the "clicked" event from the to the widget:

program {
	name: "clicked";
	signal: "mouse,clicked,*";
	source: "*";
	action: SIGNAL_EMIT "elm,action,click" "";
}

If you are really going to implement your own style you should get access to Gerrit (if you don't have it yet) to be able to explore how the default theme is implemented (see Tizen 2.4 or Tizen 3.0 theme repository).

Please see the code snippet I added implementing a custom button style.

Thanks, chaging theme is the more logicial way to change a widget color, I got it confirmed from EFL upstream  developer.