Separated Anim class, added undo delays.

1 files changed, 38 insertions, 0 deletions

diff --git a/anim.py b/anim.py
new file mode 100644
index 0000000..13a5cd2
--- /dev/null
+++ b/anim.py
@@ -0,0 +1,38 @@
+import gobject
+
+# Animation timer interval (in msec)
+_TIMER_INTERVAL = 20
+
+class Anim(object):
+    """Manages an animation."""
+    def __init__(self, update_func, end_anim_func):
+        """update_func is a function returns True if the animation should
+           continue, False otherwise.  end_anim_func is a function that takes a
+           boolean indicating whether the animation was stopped prematurely."""
+        self._update_func = update_func
+        self._end_anim_func = end_anim_func
+        self._animating = False
+
+    def start(self):
+        self._animating = True
+        self._update_func()
+        gobject.timeout_add(_TIMER_INTERVAL, self._timer)
+
+    def stop(self):
+        if self._animating:
+            self._end_anim(anim_stopped=True)
+
+    def _timer(self):
+        if not self._animating:
+            return False
+        if self._update_func():
+            return True
+        self._end_anim(anim_stopped=False)
+        return False
+
+    def _end_anim(self, anim_stopped):
+        self._animating = False
+        self._end_anim_func(anim_stopped=anim_stopped)
+
+
+