archive

mine/utils/animatedscrollable.py

@@ -0,0 +1,76 @@
+# Author: Yousef EL-Darsh
+# License (SPDX): CC-BY-NC-ND-4.0
+
+from functools import partial
+
+from fabric.widgets.scrolledwindow import ScrolledWindow
+
+from utils.animator import Animator, cubic_bezier
+
+
+class AnimatedScrollable(ScrolledWindow):
+    def __init__(
+        self,
+        bezier_curve: tuple[float, float, float, float] = (0.2, 1, 0.8, 1.0),
+        duration: float = 0.3,
+        **kwargs,
+    ):
+        super().__init__(**kwargs)
+        self._last_req = -1
+        self._last_height = -1
+        self._is_visible_state = False
+        _, min_height = self.min_content_size
+        _, max_height = self.max_content_size
+
+        self.height_animator = Animator(
+            duration=duration,
+            timing_function=partial(cubic_bezier, *bezier_curve),
+            min_value=min_height,
+            max_value=max_height,
+            notify_value=self.on_animator_change,
+            tick_widget=self,
+        )
+
+    def on_animator_change(self, animator: Animator, *_):
+        value = round(animator.value)
+
+        if value == self._last_height:
+            return
+
+        self._last_height = value
+
+        if value < 1:
+            if self._is_visible_state:
+                self.hide()
+                self._is_visible_state = False
+        else:
+            if not self._is_visible_state:
+                self.show()
+                self._is_visible_state = True
+
+        self.set_min_content_height(value)
+
+    def do_animate(
+        self,
+        from_height: int = 0,
+        to_height: int = -1,
+    ):
+        if to_height == -1:
+            return
+
+        self._last_height = from_height
+
+        self.height_animator.pause()
+        self.height_animator.min_value = from_height
+        self.height_animator.max_value = to_height
+        self.height_animator.play()
+        return
+
+    def animate_size(self, height: int = -1):
+        self._last_req = height
+        return self.do_animate(self.min_content_size[1], height)
+
+    def do_get_preferred_height(self):
+        value = self.height_animator.value
+        value = 0 if value < 0 else value
+        return value, value