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<page xmlns="http://projectmallard.org/1.0/" xmlns:its="http://www.w3.org/2005/11/its" xmlns:xi="http://www.w3.org/2001/XInclude" type="guide" style="task" id="spinner.py" xml:lang="el">
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<info>
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<title type="text">Μετρητής (Python)</title>
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<link type="guide" xref="beginner.py#display-widgets"/>
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<link type="next" xref="progressbar.py"/>
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<revision version="0.2" date="2012-06-12" status="draft"/>
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<credit type="author copyright">
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<name>Marta Maria Casetti</name>
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<email its:translate="no">mmcasetti@gmail.com</email>
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<years>2012</years>
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</credit>
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<desc>Κίνηση μετρητή</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Ελληνική μεταφραστική ομάδα GNOME</mal:name>
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<mal:email>team@gnome.gr</mal:email>
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<mal:years>2012-2015</mal:years>
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</mal:credit>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Δημήτρης Σπίγγος</mal:name>
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<mal:email>dmtrs32@gmail.com</mal:email>
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<mal:years>2012, 2013</mal:years>
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</mal:credit>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Μαρία Θουκιδίδου</mal:name>
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<mal:email>marablack3@gmail.com</mal:email>
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<mal:years>2014</mal:years>
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</mal:credit>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Θάνος Τρυφωνίδης</mal:name>
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<mal:email>tomtryf@gmail.com</mal:email>
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<mal:years>2014, 2015</mal:years>
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</mal:credit>
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</info>
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<title>Μετρητής</title>
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<media type="image" mime="image/png" src="media/spinner.png"/>
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Αυτός ο μετρητής σταματά και ξεκινά πατώντας το πλήκτρο διαστήματος.
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<links type="section"/>
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<section id="code">
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<title>Ο χρησιμοποιούμενος κώδικας για παραγωγή αυτού παραδείγματος</title>
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from gi.repository import Gtk
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from gi.repository import Gdk
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import sys
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class MyWindow(Gtk.ApplicationWindow):
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# a window
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def __init__(self, app):
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Gtk.Window.__init__(self, title="Spinner Example", application=app)
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self.set_default_size(200, 200)
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self.set_border_width(30)
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# a spinner
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self.spinner = Gtk.Spinner()
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# that by default spins
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self.spinner.start()
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# add the spinner to the window
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self.add(self.spinner)
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# event handler
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# a signal from the keyboard (space) controls if the spinner stops/starts
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def do_key_press_event(self, event):
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# keyname is the symbolic name of the key value given by the event
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keyname = Gdk.keyval_name(event.keyval)
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# if it is "space"
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if keyname == "space":
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# and the spinner is active
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if self.spinner.get_property("active"):
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# stop the spinner
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self.spinner.stop()
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# if the spinner is not active
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else:
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# start it again
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self.spinner.start()
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# stop the signal emission
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return True
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class MyApplication(Gtk.Application):
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def __init__(self):
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Gtk.Application.__init__(self)
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def do_activate(self):
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win = MyWindow(self)
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win.show_all()
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def do_startup(self):
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Gtk.Application.do_startup(self)
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app = MyApplication()
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exit_status = app.run(sys.argv)
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sys.exit(exit_status)
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<note>Το Gdk.keyval_name(event.keyval) μετατρέπει την τιμή κλειδιού event.keyval σε ένα συμβολικό όνομα. Τα ονόματα και οι αντίστοιχες τιμές κλειδιού μπορούν να βρεθούν <link href="http://git.gnome.org/browse/gtk+/tree/gdk/gdkkeysyms.h">εδώ</link>, αλλά για παράδειγμα το GDK_KEY_BackSpace γίνεται η συμβολοσειρά "BackSpace" . </note>
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</section>
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<section id="references">
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<title>Αναφορές API</title>
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Σε αυτό το παράδειγμα χρησιμοποιήσαμε τα παρακάτω:
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<list>
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<item><link href="http://developer.gnome.org/gtk3/unstable/GtkSpinner.html">GtkSpinner</link> </item>
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<item><link href="http://developer.gnome.org/gdk/stable/gdk-Keyboard-Handling.html">Key Values</link> </item>
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</list>
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</section>
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</page>
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