Reorganized classes into separate files

pycmx/transition.py

@@ -0,0 +1,91 @@
+# pycmx
+# (c) 2018 Jamie Hardt
+
+
+class Transition:
+    """
+    A CMX transition: a wipe, dissolve or cut.
+    """
+
+    Cut = "C"
+    Dissolve = "D"
+    Wipe = "W"
+    KeyBackground = "KB"
+    Key = "K"
+    KeyOut = "KO"
+
+
+    def __init__(self, transition, operand):
+        self.transition = transition
+        self.operand = operand
+        self.name = ''
+
+
+    @property
+    def kind(self):
+        """
+        Return the kind of transition: Cut, Wipe, etc
+        """
+        if self.cut:
+            return Transition.Cut
+        elif self.dissolve:
+            return Transition.Dissolve
+        elif self.wipe:
+            return Transition.Wipe
+        elif self.key_background:
+            return Transition.KeyBackground
+        elif self.key_foreground:
+            return Transition.Key
+        elif self.key_out:
+            return Transition.KeyOut
+
+    @property
+    def cut(self):
+        "`True` if this transition is a cut."
+        return self.transition == 'C' 
+
+    @property
+    def dissolve(self):
+        "`True` if this traansition is a dissolve."
+        return self.transition == 'D'
+
+
+    @property
+    def wipe(self):
+        "`True` if this transition is a wipe."
+        return self.transition.startswith('W')
+
+
+    @property
+    def effect_duration(self):
+        """The duration of this transition, in frames of the record target.
+        
+        In the event of a key event, this is the duration of the fade in.
+        """
+        return int(self.operand)
+
+    @property
+    def wipe_number(self):
+        "Wipes are identified by a particular number."
+        if self.wipe:
+            return int(self.transition[1:])
+        else:
+            return None
+
+    @property
+    def key_background(self):
+        "`True` if this edit is a key background."
+        return self.transition == KeyBackground
+
+    @property
+    def key_foreground(self):
+        "`True` if this edit is a key foreground."
+        return self.transition == Key
+
+    @property
+    def key_out(self):
+        """
+        `True` if this edit is a key out. This material will removed from
+        the key foreground and replaced with the key background.
+        """
+        return self.transition == KeyOut