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Editing: _gtktemplate.py
# Copyright 2015 Dustin Spicuzza <dustin@virtualroadside.com> # 2018 Nikita Churaev <lamefun.x0r@gmail.com> # 2018 Christoph Reiter <reiter.christoph@gmail.com> # # This library is free software; you can redistribute it and/or # modify it under the terms of the GNU Lesser General Public # License as published by the Free Software Foundation; either # version 2.1 of the License, or (at your option) any later version. # # This library is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU # Lesser General Public License for more details. # # You should have received a copy of the GNU Lesser General Public # License along with this library; if not, write to the Free Software # Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 # USA import os from collections import abc from functools import partial from gi.repository import GLib, GObject, Gio def _extract_handler_and_args(obj_or_map, handler_name): handler = None if isinstance(obj_or_map, abc.Mapping): handler = obj_or_map.get(handler_name, None) else: handler = getattr(obj_or_map, handler_name, None) if handler is None: raise AttributeError('Handler %s not found' % handler_name) args = () if isinstance(handler, abc.Sequence): if len(handler) == 0: raise TypeError("Handler %s tuple can not be empty" % handler) args = handler[1:] handler = handler[0] elif not callable(handler): raise TypeError('Handler %s is not a method, function or tuple' % handler) return handler, args def define_builder_scope(): from gi.repository import Gtk class BuilderScope(GObject.GObject, Gtk.BuilderScope): def __init__(self, scope_object=None): super().__init__() self._scope_object = scope_object def do_create_closure(self, builder, func_name, flags, obj): current_object = builder.get_current_object() or self._scope_object if not self._scope_object: current_object = builder.get_current_object() if func_name not in current_object.__gtktemplate_methods__: return None current_object.__gtktemplate_handlers__.add(func_name) handler_name = current_object.__gtktemplate_methods__[func_name] else: current_object = self._scope_object handler_name = func_name swapped = int(flags & Gtk.BuilderClosureFlags.SWAPPED) if swapped: raise RuntimeError( "%r not supported" % GObject.ConnectFlags.SWAPPED) return None handler, args = _extract_handler_and_args(current_object, handler_name) if obj: p = partial(handler, *args, swap_data=obj) else: p = partial(handler, *args) p.__gtk_template__ = True return p return BuilderScope def connect_func(builder, obj, signal_name, handler_name, connect_object, flags, cls): if handler_name not in cls.__gtktemplate_methods__: return method_name = cls.__gtktemplate_methods__[handler_name] template_inst = builder.get_object(cls.__gtype_name__) template_inst.__gtktemplate_handlers__.add(handler_name) handler = getattr(template_inst, method_name) after = int(flags & GObject.ConnectFlags.AFTER) swapped = int(flags & GObject.ConnectFlags.SWAPPED) if swapped: raise RuntimeError( "%r not supported" % GObject.ConnectFlags.SWAPPED) if connect_object is not None: if after: func = obj.connect_object_after else: func = obj.connect_object func(signal_name, handler, connect_object) else: if after: func = obj.connect_after else: func = obj.connect func(signal_name, handler) def register_template(cls): from gi.repository import Gtk bound_methods = {} bound_widgets = {} for attr_name, obj in list(cls.__dict__.items()): if isinstance(obj, CallThing): setattr(cls, attr_name, obj._func) handler_name = obj._name if handler_name is None: handler_name = attr_name if handler_name in bound_methods: old_attr_name = bound_methods[handler_name] raise RuntimeError( "Error while exposing handler %r as %r, " "already available as %r" % ( handler_name, attr_name, old_attr_name)) else: bound_methods[handler_name] = attr_name elif isinstance(obj, Child): widget_name = obj._name if widget_name is None: widget_name = attr_name if widget_name in bound_widgets: old_attr_name = bound_widgets[widget_name] raise RuntimeError( "Error while exposing child %r as %r, " "already available as %r" % ( widget_name, attr_name, old_attr_name)) else: bound_widgets[widget_name] = attr_name cls.bind_template_child_full(widget_name, obj._internal, 0) cls.__gtktemplate_methods__ = bound_methods cls.__gtktemplate_widgets__ = bound_widgets if Gtk._version == "4.0": BuilderScope = define_builder_scope() cls.set_template_scope(BuilderScope()) else: cls.set_connect_func(connect_func, cls) base_init_template = cls.init_template cls.__dontuse_ginstance_init__ = \ lambda s: init_template(s, cls, base_init_template) # To make this file work with older PyGObject we expose our init code # as init_template() but make it a noop when we call it ourselves first cls.init_template = cls.__dontuse_ginstance_init__ def init_template(self, cls, base_init_template): self.init_template = lambda: None if self.__class__ is not cls: raise TypeError( "Inheritance from classes with @Gtk.Template decorators " "is not allowed at this time") self.__gtktemplate_handlers__ = set() base_init_template(self) for widget_name, attr_name in self.__gtktemplate_widgets__.items(): self.__dict__[attr_name] = self.get_template_child(cls, widget_name) for handler_name, attr_name in self.__gtktemplate_methods__.items(): if handler_name not in self.__gtktemplate_handlers__: raise RuntimeError( "Handler '%s' was declared with @Gtk.Template.Callback " "but was not present in template" % handler_name) class Child(object): def __init__(self, name=None, **kwargs): self._name = name self._internal = kwargs.pop("internal", False) if kwargs: raise TypeError("Unhandled arguments: %r" % kwargs) class CallThing(object): def __init__(self, name, func): self._name = name self._func = func class Callback(object): def __init__(self, name=None): self._name = name def __call__(self, func): return CallThing(self._name, func) def validate_resource_path(path): """Raises GLib.Error in case the resource doesn't exist""" try: Gio.resources_get_info(path, Gio.ResourceLookupFlags.NONE) except GLib.Error: # resources_get_info() doesn't handle overlays but we keep using it # as a fast path. # https://gitlab.gnome.org/GNOME/pygobject/issues/230 Gio.resources_lookup_data(path, Gio.ResourceLookupFlags.NONE) class Template(object): def __init__(self, **kwargs): self.string = None self.filename = None self.resource_path = None if "string" in kwargs: self.string = kwargs.pop("string") elif "filename" in kwargs: self.filename = kwargs.pop("filename") elif "resource_path" in kwargs: self.resource_path = kwargs.pop("resource_path") else: raise TypeError( "Requires one of the following arguments: " "string, filename, resource_path") if kwargs: raise TypeError("Unhandled keyword arguments %r" % kwargs) @classmethod def from_file(cls, filename): return cls(filename=filename) @classmethod def from_string(cls, string): return cls(string=string) @classmethod def from_resource(cls, resource_path): return cls(resource_path=resource_path) Callback = Callback Child = Child def __call__(self, cls): from gi.repository import Gtk if not isinstance(cls, type) or not issubclass(cls, Gtk.Widget): raise TypeError("Can only use @Gtk.Template on Widgets") if "__gtype_name__" not in cls.__dict__: raise TypeError( "%r does not have a __gtype_name__. Set it to the name " "of the class in your template" % cls.__name__) if hasattr(cls, "__gtktemplate_methods__"): raise TypeError("Cannot nest template classes") if self.string is not None: data = self.string if not isinstance(data, bytes): data = data.encode("utf-8") bytes_ = GLib.Bytes.new(data) cls.set_template(bytes_) register_template(cls) return cls elif self.resource_path is not None: validate_resource_path(self.resource_path) cls.set_template_from_resource(self.resource_path) register_template(cls) return cls else: assert self.filename is not None file_ = Gio.File.new_for_path(os.fspath(self.filename)) bytes_ = GLib.Bytes.new(file_.load_contents()[1]) cls.set_template(bytes_) register_template(cls) return cls __all__ = ["Template"]
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