如何在GTK3中向按钮添加图标？

Question

I am using Glade to generate C-based GUI's. I have a GtkButton in my UI and would like to display an icon on it.

In glade there seems to be an option on the General properties of the GtkButton called 'Label with optional image'. However, I can't get this to work.

On the main() I have:

button = gtk_builder_get_object (builder, "start_button");
button = gtk_button_new_from_icon_name ("document-new-symbolic", GTK_ICON_SIZE_BUTTON);

In the same folder where i run the binary file, I have a small document-new-symbolic.png. On the docs it says that "If the icon name isn't known, a “broken image” icon will be displayed instead." However, in my case, just the normal button appears without any icon.

What is going on? Why is the icon not displayed?

Answer 1

Try

GtkWidget *image = gtk_image_new_from_file("document-new-symbolic.png");
gtk_button_set_image(button, image);