Small fixes and lots of comments
This commit is contained in:
Sean Davis
parent
1f95800db7
commit
a418fb39b2
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@ -30,12 +30,13 @@ class CameraMugshotDialog(CameraDialog):
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__gtype_name__ = "CameraMugshotDialog"
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def finish_initializing(self, builder): # pylint: disable=E1002
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"""Set up the preferences dialog"""
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"""Set up the camera dialog"""
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super(CameraMugshotDialog, self).finish_initializing(builder)
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# Initialize Gst or nothing will work.
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Gst.init(None)
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# Code for other initialization actions should be added here.
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# Pack the video widget into the dialog.
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vbox = builder.get_object('camera_box')
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self.video_window = Gtk.DrawingArea()
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self.draw_handler = self.video_window.connect('draw', self.on_draw)
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@ -43,6 +44,7 @@ class CameraMugshotDialog(CameraDialog):
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vbox.pack_start(self.video_window, True, True, 0)
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self.video_window.show()
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# Prepare the camerabin element.
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self.camerabin = Gst.ElementFactory.make("camerabin", "camera-source")
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bus = self.camerabin.get_bus()
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bus.add_signal_watch()
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@ -51,41 +53,51 @@ class CameraMugshotDialog(CameraDialog):
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bus.connect("sync-message::element", self._on_sync_message)
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self.realized = False
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# Essential widgets
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self.record_button = builder.get_object('camera_record')
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self.apply_button = builder.get_object('camera_apply')
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self.show_all()
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# Store the temporary filename to be used.
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self.filename = None
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self.show_all()
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def on_draw(self, widget, ctx):
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"""Display a message that the camera is initializing on first draw.
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Afterwards, blank the drawing area to clear the message."""
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# Get the height and width of the drawing area.
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alloc = widget.get_allocation()
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height = alloc.height
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width = alloc.width
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font_size = 20
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ctx.set_source_rgb(255,255,255)
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ctx.select_font_face("Sans", cairo.FONT_SLANT_NORMAL,
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cairo.FONT_WEIGHT_NORMAL)
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ctx.set_font_size(20)
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ctx.move_to(10,(height-font_size)/2)
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ctx.show_text(_("Please wait while your"))
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ctx.move_to(10,(height-font_size)/2+20)
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ctx.show_text(_("camera is initialized."))
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widget.disconnect(self.draw_handler)
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self.draw_handler = widget.connect('draw', self.on_blank)
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def on_blank(self, widget, ctx):
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ctx.set_source_rgb(0,0,0)
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ctx.paint()
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# Set the font details.
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font_size = 20
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font_color = (255,255,255)
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font_name = "Sans"
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# Draw the message to the drawing area.
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ctx.set_source_rgb(*font_color)
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ctx.select_font_face(font_name, cairo.FONT_SLANT_NORMAL,
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cairo.FONT_WEIGHT_NORMAL)
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ctx.set_font_size(font_size)
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ctx.move_to(10,(height-font_size)/2)
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# Translators: This string is split for use with cairo. The complete string is "Please wait while your camera is initialized."
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ctx.show_text(_("Please wait while your"))
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ctx.move_to(10,(height-font_size)/2+font_size)
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# Translators: This string is split for use with cairo. The complete string is "Please wait while your camera is initialized."
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ctx.show_text(_("camera is initialized."))
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# Redefine on_draw to blank the drawing area next time.
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def on_draw(self, widget, ctx):
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ctx.set_source_rgb(0,0,0)
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ctx.paint()
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# Redefine on_draw once more to do nothing else.
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def on_draw(self, widget, ctx):
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pass
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def play(self):
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"""play - Start the camera streaming and display the output. It is
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necessary to start the camera playing before using most other functions.
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This function has no arguments
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"""
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"""Start the camera streaming and display the output. It is necessary
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to start the camera playing before using most other functions."""
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if not self.realized:
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self._set_video_window_id()
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if not self.realized:
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@ -94,175 +106,195 @@ class CameraMugshotDialog(CameraDialog):
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self.camerabin.set_state(Gst.State.PLAYING)
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def pause(self):
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"""pause - Pause the camera output. It will cause the image to
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"freeze". Use play() to start the camera playng again. Note that
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calling pause before play may cause errors on certain camera.
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This function has no arguments
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"""
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"""Pause the camera output. It will cause the image to "freeze".
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Use play() to start the camera playing again. Note that calling pause
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before play may cause errors on certain camera."""
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self.camerabin.set_state(Gst.State.PAUSED)
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def take_picture(self, filename):
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"""take_picture - grab a frame from the web cam and save it to
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~/Pictures/datestamp.png, where datestamp is the current datestamp.
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It's possible to add a prefix to the datestamp by setting the
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filename_prefix property.
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"""take_picture - grab a frame from the webcam and save it to
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'filename.
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If play is not called before take_picture,
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an error may occur. If take_picture is called immediately after play,
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the camera may not be fully initialized, and an error may occur.
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Connect to the signal "image-captured" to be alerted when the picture
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is saved.
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This function has no arguments
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returns - a string of the filename used to save the image
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"""
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is saved."""
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self.camerabin.set_property("location", filename)
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self.camerabin.emit("start-capture")
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#self.pause()
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return filename
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def stop(self):
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"""stop - Stop the camera streaming and display the output.
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This function has no arguments
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"""
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"""Stop the camera streaming and display the output."""
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self.camerabin.set_state(Gst.State.NULL)
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def _on_message(self, bus, message):
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""" _on_message - internal signal handler for bus messages.
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"""Internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent
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"""
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message: the message sent"""
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# Ignore if there is no message.
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if message is None:
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return
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# Get the message type.
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t = message.type
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# Initial load, wait until camera is ready before enabling capture.
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if t == Gst.MessageType.ASYNC_DONE:
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self.record_button.set_sensitive(True)
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if t == Gst.MessageType.ELEMENT:
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# Keep the camera working after several pictures are taken.
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if message.get_structure().get_name() == "image-captured":
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#work around to keep the camera working after lots
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#of pictures are taken
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self.camerabin.set_state(Gst.Sate.NULL)
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self.camerabin.set_state(Gst.State.PLAYING)
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self.emit("image-captured", self.filename)
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# Enable interface elements once the images are finished saving.
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elif message.get_structure().get_name() == "image-done":
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self.apply_button.set_sensitive(True)
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self.record_button.set_sensitive(True)
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self.pause()
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# Stop the stream if the EOS (end of stream) message is received.
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if t == Gst.MessageType.EOS:
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self.camerabin.set_state(Gst.State.NULL)
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# Capture and report any error received.
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elif t == Gst.MessageType.ERROR:
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err, debug = message.parse_error()
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print "Error: %s" % err, debug
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logger.error("%s" % err, debug)
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def _on_sync_message(self, bus, message):
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""" _on_sync_message - internal signal handler for bus messages.
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May be useful to extend in a base class to handle messages
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produced from custom behaviors.
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arguments -
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bus: the bus from which the message was sent, typically self.bux
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message: the message sent
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"""
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# Ignore empty messages.
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if message.get_structure() is None:
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return
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message_name = message.get_structure().get_name()
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# Embed the gstreamer element into our window.
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if message_name == "prepare-window-handle":
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imagesink = message.src
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imagesink.set_property("force-aspect-ratio", True)
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imagesink.set_window_handle(self.video_window.get_window().get_xid())
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def __on_video_window_realized(self, widget, data=None):
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"""__on_video_window_realized - internal signal handler, used
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to set up the xid for the drawing area in thread safe manner.
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Do not call directly.
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"""
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"""Internal signal handler, used to set up the xid for the drawing area
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in a thread safe manner. Do not call directly."""
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self._set_video_window_id()
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def _set_video_window_id(self):
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"""Set the window ID only if not previously configured."""
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if not self.realized and self.video_window.get_window() is not None:
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x = self.video_window.get_window().get_xid()
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self.realized = True
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def on_camera_record_clicked(self, widget):
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if self.filename: os.remove(self.filename)
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"""When the camera record/retry button is clicked:
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Record: Pause the video, start the capture, enable apply and retry.
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Retry: Restart the video stream."""
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# Remove any previous temporary file.
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if self.filename and os.path.isfile(self.filename):
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os.remove(self.filename)
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# Retry action.
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if self.apply_button.get_sensitive():
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# Retry mode
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.play()
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# Record (Capture) action.
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else:
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# Create a new temporary file.
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tmpfile = tempfile.NamedTemporaryFile(delete=False)
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tmpfile.close()
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self.filename = tmpfile.name
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# Capture the current image.
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self.take_picture(self.filename)
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# Set the record button to retry, and disable it until the capture
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# finishes.
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self.record_button.set_label(_("Retry"))
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self.record_button.set_sensitive(False)
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#self.apply_button.set_sensitive(True)
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def on_camera_apply_clicked(self, widget):
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"""When the camera Apply button is clicked, crop the current photo and
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emit a signal to let the main application know there is a new file
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available. Then close the camera dialog."""
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self.center_crop(self.filename)
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self.emit( "apply", self.filename )
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self.emit("apply", self.filename)
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self.hide()
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def on_camera_cancel_clicked(self, widget):
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"""When the Cancel button is clicked, just hide the dialog."""
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self.hide()
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def on_camera_mugshot_dialog_destroy(self, widget, data=None):
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"""When the application exits, remove the current temporary file and
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stop the gstreamer element."""
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# Clear away the temp file.
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os.remove(self.filename)
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#clean up the camera before exiting
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if self.filename and os.path.isfile(self.filename):
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os.remove(self.filename)
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# Clean up the camera before exiting
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self.camerabin.set_state(Gst.State.NULL)
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def on_camera_mugshot_dialog_hide(self, widget, data=None):
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"""When the dialog is hidden, pause the camera recording."""
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self.pause()
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def on_camera_mugshot_dialog_show(self, widget, data=None):
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"""When the dialog is shown, set the record button to record, disable
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the apply button, and start the camera."""
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self.record_button.set_label(Gtk.STOCK_MEDIA_RECORD)
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self.apply_button.set_sensitive(False)
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self.show_all()
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self.play()
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def center_crop(self, filename):
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"""Crop the specified file to square dimensions."""
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# Load the image into a Pixbuf.
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pixbuf = GdkPixbuf.Pixbuf.new_from_file(filename)
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# Get the image dimensions.
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height = pixbuf.get_height()
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width = pixbuf.get_width()
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start_x = 0
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start_y = 0
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# Calculate a balanced center.
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if width > height:
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start_x = (width-height)/2
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width = height
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else:
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start_y = (height-width)/2
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height = width
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# Create a new cropped pixbuf.
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new_pixbuf = pixbuf.new_subpixbuf(start_x, start_y, width, height)
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# Overwrite the temporary file with our new cropped image.
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new_pixbuf.savev(filename, "png", [], [])
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def on_camera_mugshot_dialog_delete_event(self, widget, data=None):
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"""Override the dialog delete event to just hide the window."""
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self.hide()
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return True
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# Signals used by CameraMugshotDialog:
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# image-captured: emitted when the camera is done capturing an image.
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# apply: emitted when the apply button has been pressed and there is a new file saved for use.
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__gsignals__ = {'image-captured' : (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE,
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(GObject.TYPE_PYOBJECT,)),
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'apply' : (GObject.SIGNAL_RUN_LAST, GObject.TYPE_NONE, (GObject.TYPE_STRING,))
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