Release audio/video on visibility change (OLPC#10659)

When visibility is lost, stop recording, live feeds, countdowns, etc.
Allows multiple camera-using apps to run simultaenously.

This doesn't quite work correctly, having 2 Records open and switching
from one to the other doesn't work as expected. Perhaps the events
are being delivered without strict order, or not enough time is being
given to the old Record to release its resources before activating the
new one.

1 files changed, 7 insertions, 0 deletions

diff --git a/record.py b/record.py
index e6c7bb3..5c06f20 100644
--- a/record.py
+++ b/record.py
@@ -68,6 +68,9 @@ class Record(activity.Activity):
         self.props.enable_fullscreen_mode = False
         Instance(self)
 
+        self.add_events(gtk.gdk.VISIBILITY_NOTIFY_MASK)
+        self.connect("visibility-notify-event", self._visibility_changed)
+
         #the main classes
         self.model = Model(self)
         self.ui_init()
@@ -101,6 +104,9 @@ class Record(activity.Activity):
         self.model.glive.stop()
         super(Record, self).close()
 
+    def _visibility_changed(self, widget, event):
+        self.model.set_visible(event.state != gtk.gdk.VISIBILITY_FULLY_OBSCURED)
+
     def _shared_cb(self, activity):
         self.model.collab.set_activity_shared()
 
@@ -373,6 +379,7 @@ class Record(activity.Activity):
             self._progress.hide()
             self._controls_hbox.set_child_packing(self._shutter_button, expand=True, fill=False, padding=0, pack_type=gtk.PACK_START)
             self._shutter_button.set_normal()
+            self._shutter_button.set_sensitive(True)
             self._shutter_button.show()
             self._media_view.show_live()
         elif state == constants.STATE_RECORDING: