library: Port 'List View Widget' to Python

src/Library/demos/List View Widgets/main.py

@@ -0,0 +1,91 @@
+from typing import cast
+import gi
+
+gi.require_version("Gtk", "4.0")
+from gi.repository import Gtk
+import workbench
+
+list_view = workbench.builder.get_object("list_view")
+grid_view = workbench.builder.get_object("grid_view")
+add = workbench.builder.get_object("add")
+remove = workbench.builder.get_object("remove")
+
+item = 1
+
+
+def setup(_factory, list_item: Gtk.ListItem):
+    list_box = Gtk.Box(
+        width_request=160,
+        height_request=160,
+        css_classes=["card"],
+    )
+    label = Gtk.Label(
+        halign=Gtk.Align.CENTER,
+        hexpand=True,
+        valign=Gtk.Align.CENTER,
+    )
+    list_box.append(label)
+    list_item.set_child(list_box)
+
+
+def bind(_factory, list_item: Gtk.ListItem):
+    list_box = list_item.get_child()
+    # If you don't use typing / type checkers, you do not need to cast.
+    model_item = cast(Gtk.StringObject, list_item.get_item())
+    label_widget = cast(Gtk.Label, list_box.get_last_child())
+
+    label_widget.set_label(model_item.get_string())
+
+
+def items_changed(_list, position: int, removed: int, added: int):
+    print(
+        f"position: {position}, Item removed? {removed > 0}, Item added? {added > 0}",
+    )
+
+
+def selection_changed(model: Gtk.SingleSelection, _position, _n_items):
+    selected_item = model.get_selected()
+    # If you don't use typing / type checkers, you do not need to cast.
+    backend_model = cast(Gtk.StringList, model.get_model())
+    print(f"Model item selected from view: {backend_model.get_string(selected_item)}")
+
+
+# Model
+string_model = Gtk.StringList.new(
+    strings=["Default Item 1", "Default Item 2", "Default Item 3"],
+)
+
+model = Gtk.SingleSelection.new(model=string_model)
+
+factory_for_grid_view = Gtk.SignalListItemFactory.new()
+factory_for_grid_view.connect("setup", setup)
+factory_for_grid_view.connect("bind", bind)
+
+# View
+model.get_model().connect("items-changed", items_changed)
+
+model.connect("selection-changed", selection_changed)
+
+list_view.set_model(model)
+grid_view.set_model(model)
+grid_view.set_factory(factory_for_grid_view)
+
+
+def add_clicked(*args):
+    global item
+    new_item = f"New item {item}"
+    backend_model = cast(Gtk.StringList, model.get_model())
+    backend_model.append(new_item)
+    item += 1
+
+
+def remove_clicked(*args):
+    selected_item = model.get_selected()
+    backend_model = cast(Gtk.StringList, model.get_model())
+    backend_model.remove(selected_item)
+
+
+# Controller
+add.connect("clicked", add_clicked)
+
+remove.connect("clicked", remove_clicked)