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============
Gtk.Template
============
A GtkWidget subclass can use a
`GtkBuilder UI Definition <https://developer.gnome.org/gtk3/stable/GtkBuilder.html#BUILDER-UI>`__
XML document as a template to create child widgets and set its own
properties, without creating a GtkBuilder instance. This is implemented
for Python by PyGObject with Gtk.Template.
The subclass uses a ``@Gtk.Template`` decorator and declares a class
variable ``__gtype_name__`` with the value of the XML ``template``
element ``class`` attribute.
Child widgets are declared, typically with the same names as the XML
``object`` element ``id`` attributes, at the class level as instances
of ``Gtk.Template.Child``.
Signal handler methods, typically with the same names as the XML ``signal``
element ``handler`` attributes, use the ``@Gtk.Template.Callback`` decorator.
``Gtk.Template()`` takes a mandatory keyword argument passing the XML document
or its location, either ``string``, ``filename`` or ``resource_path``.
``Gtk.Template.Child()`` and ``Gtk.Template.Callback()`` optionally take
a ``name`` argument matching the value of the respective XML attribute,
in which case the Python attribute can have a different name.
Examples
--------
.. code-block:: python
xml = """\
<interface>
<template class="example1" parent="GtkBox">
<child>
<object class="GtkButton" id="hello_button">
<property name="label">Hello World</property>
<signal name="clicked" handler="hello_button_clicked" swapped="no" />
</object>
</child>
</template>
</interface>
"""
@Gtk.Template(string=xml)
class Foo(Gtk.Box):
__gtype_name__ = "example1"
hello_button = Gtk.Template.Child()
@Gtk.Template.Callback()
def hello_button_clicked(self, *args):
pass
Python attribute names that are different to the XML values:
.. code-block:: python
@Gtk.Template(string=xml)
class Foo(Gtk.Box):
__gtype_name__ = "example1"
my_button = Gtk.Template.Child("hello_button")
@Gtk.Template.Callback("hello_button_clicked")
def bar(self, *args):
pass
Subclasses that declare ``__gtype_name__`` can be used as objects in the XML:
.. code-block:: python
xml = """\
<interface>
<template class="example3" parent="GtkBox">
<child>
<object class="ExampleButton" id="hello_button">
<property name="label">Hello World</property>
<signal name="clicked" handler="hello_button_clicked" swapped="no" />
</object>
</child>
</template>
</interface>
"""
class HelloButton(Gtk.Button):
__gtype_name__ = "ExampleButton"
@Gtk.Template(string=xml)
class Foo(Gtk.Box):
__gtype_name__ = "example3"
hello_button = Gtk.Template.Child()
@Gtk.Template.Callback()
def hello_button_clicked(self, *args):
pass
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