Port 'Animation' to Python (#29)

* Port 'Animation' to Python

---------

Co-authored-by: Roland Lötscher <[email protected]>
Co-authored-by: Sonny Piers <[email protected]>

src/Animation/main.js

@@ -41,11 +41,10 @@ const animation_spring = new Adw.SpringAnimation({
   value_to: 1,
   spring_params: params,
   target: target_spring,
+  initial_velocity: 1.0, // If amplitude of oscillation < epsilon, animation stops
+  epsilon: 0.001,
+  clamp: false,
 });
-animation_spring.initial_velocity = 1.0;
-// If amplitude of oscillation < epsilon, animation stops
-animation_spring.epsilon = 0.001;
-animation_spring.clamp = false;
 
 button_spring.connect("clicked", () => {
   animation_spring.play();

src/Animation/main.py

@@ -0,0 +1,67 @@
+import gi
+
+gi.require_version("Gtk", "4.0")
+gi.require_version("Adw", "1")
+
+from gi.repository import Gsk, Graphene, Adw
+import workbench
+
+
+button_timed = workbench.builder.get_object("button_timed")
+progress_bar = workbench.builder.get_object("progress_bar")
+target_timed = Adw.PropertyAnimationTarget.new(progress_bar, "fraction")
+
+animation_timed = Adw.TimedAnimation(
+    widget=progress_bar,
+    value_from=0,
+    value_to=1,
+    duration=1500,
+    easing=Adw.Easing.EASE_IN_OUT_CUBIC,
+    target=target_timed,
+)
+
+button_timed.connect("clicked", lambda _: animation_timed.play())
+animation_timed.connect("done", lambda _: animation_timed.reset())
+
+button_spring = workbench.builder.get_object("button_spring")
+ball = workbench.builder.get_object("ball")
+
+
+def get_end_position(widget):
+    parent_width = widget.get_parent().get_width()
+    width = ball.get_width()
+
+    return parent_width - width
+
+
+def move_widget(widget, x, y):
+    transform = Gsk.Transform.new()
+    p = Graphene.Point().init(x, y)
+    transform = transform.translate(p)
+    widget.allocate(widget.get_width(), widget.get_height(), -1, transform)
+
+
+def animation_cb(value):
+    end = get_end_position(ball)
+    x = Adw.lerp(0, end, value)
+    move_widget(ball, x, 0)
+
+
+target_spring = Adw.CallbackAnimationTarget.new(animation_cb)
+params = Adw.SpringParams.new(
+    damping_ratio=0.5,
+    mass=1.0,
+    stiffness=50.0,
+)
+animation_spring = Adw.SpringAnimation(
+    widget=ball,
+    value_from=0,
+    value_to=1,
+    spring_params=params,
+    target=target_spring,
+    initial_velocity=1.0,  # If amplitude of oscillation < epsilon, animation stops
+    epsilon=0.001,
+    clamp=False,
+)
+
+button_spring.connect("clicked", lambda _: animation_spring.play())