feat(desktop): now move widget with drag to any place of window

src/window/desktop/date.py

@@ -0,0 +1,52 @@
+from fabric.widgets.box import Box
+from fabric.widgets.datetime import DateTime
+
+from window.desktop.registry import DesktopWidgetRegistry
+
+
+class DesktopDateWidget(Box):
+    def __init__(self, **kwargs):
+        super().__init__(
+            name="date-widget",
+            h_expand=True,
+            v_expand=True,
+            justification="center",
+            h_align="center",
+            v_align="start",
+            orientation="v",
+            **kwargs,
+        )
+        self.top = Box(orientation="h", name="date-top", h_expand=True)
+        # Using a highly frequent interval (e.g. 10000ms/10s) causes the DateTime widget
+        # (which inherits from Gtk.Button) to repeatedly call set_label.
+        # In GTK3, repeatedly replacing a button's label can cause rendering glitches
+        # where the layout engine drops the child label's visibility after some time.
+        # Since this is just a date widget, we increase the interval to 100000ms (100 seconds)
+        # which easily avoids the continuous redraw glitch while keeping the date accurate.
+        date_interval = 100000
+        self.dateone = DateTime(formatters=["%a"], interval=date_interval, name="day")
+        self.datetwo = DateTime(formatters=["%b"], interval=date_interval, name="month")
+        self.datethree = DateTime(
+            formatters=["%-d"], interval=date_interval, name="date"
+        )
+        self.top.add(self.dateone)
+        self.top.add(self.datetwo)
+        self.add(self.top)
+        self.add(self.datethree)
+
+
+class DesktopDateContainer(Box):
+    def __init__(self, **kwargs):
+        super().__init__(
+            orientation="v",
+            name="date-container",
+            v_expand=True,
+            size=(170, 170),
+            v_align="center",
+            h_align="center",
+            children=[DesktopDateWidget()],
+            **kwargs,
+        )
+
+
+DesktopWidgetRegistry.register("date", DesktopDateContainer, (174, 174))