Library: Port 'Flow Box' to Python (#744)

Affected by #745

Author: gregorni

src/Library/demos/Flow Box/main.py

@@ -0,0 +1,36 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+from gi.repository import Adw, Gtk
+import workbench
+
+flowbox = workbench.builder.get_object("flowbox")
+
+
+def add_emoji(_flowbox, unicode):
+    item = Adw.Bin(
+        child=Gtk.Label(
+            vexpand=True,
+            hexpand=True,
+            label=unicode,
+            css_classes=["emoji"],
+        ),
+        width_request=100,
+        height_request=100,
+        css_classes=["card"],
+    )
+    _flowbox.append(item)
+
+
+for code in range(128513, 128591):
+    add_emoji(flowbox, chr(code))
+
+
+def on_item_selected(_flowbox, item):
+    # FlowBoxChild -> AdwBin -> Label
+    emoji = item.get_child().get_child().get_label()
+    print("Unicode:", emoji.encode("unicode-escape"))
+
+
+flowbox.connect("child-activated", on_item_selected)