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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="colorbutton.py" xml:lang="fr">
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<info>
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<title type="text">ColorButton (Python)</title>
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<link type="guide" xref="beginner.py#color-selectors"/>
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<link type="next" xref="fontchooserwidget.py"/>
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<revision version="0.1" date="2012-06-03" 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>Un bouton pour ouvrir une boîte de dialogue de sélection de couleur</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Luc Rebert,</mal:name>
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<mal:email>traduc@rebert.name</mal:email>
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<mal:years>2011</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>Alain Lojewski,</mal:name>
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<mal:email>allomervan@gmail.com</mal:email>
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<mal:years>2011-2012</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>Luc Pionchon</mal:name>
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<mal:email>pionchon.luc@gmail.com</mal:email>
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<mal:years>2011</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>Bruno Brouard</mal:name>
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<mal:email>annoa.b@gmail.com</mal:email>
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<mal:years>2011-12</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>Luis Menina</mal:name>
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<mal:email>liberforce@freeside.fr</mal:email>
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<mal:years>2014</mal:years>
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</mal:credit>
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</info>
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<title>ColorButton</title>
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<media type="image" mime="image/png" src="media/colorbutton.png"/>
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Ce ColorButton ouvre une boîte de dialogue pour sélectionner une couleur et affiche dans le terminal les valeurs RVB de la couleur sélectionnée.
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<links type="sections"/>
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<section id="code">
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<title>Code utilisé pour générer cet exemple</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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def __init__(self, app):
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Gtk.Window.__init__(self, title="ColorButton", application=app)
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self.set_default_size(150, 50)
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self.set_border_width(10)
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# a colorbutton (which opens a dialogue window in
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# which we choose a color)
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self.button = Gtk.ColorButton()
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# with a default color (blue, in this instance)
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color = Gdk.RGBA()
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color.red = 0.0
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color.green = 0.0
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color.blue = 1.0
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color.alpha = 0.5
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self.button.set_rgba(color)
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# choosing a color in the dialogue window emits a signal
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self.button.connect("color-set", self.on_color_chosen)
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# a label
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label = Gtk.Label()
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label.set_text("Click to choose a color")
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# a grid to attach button and label
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grid = Gtk.Grid()
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grid.attach(self.button, 0, 0, 2, 1)
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grid.attach(label, 0, 1, 2, 1)
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self.add(grid)
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# if a new color is chosen, we print it as rgb(r,g,b) in the terminal
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def on_color_chosen(self, user_data):
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print("You chose the color: " + self.button.get_rgba().to_string())
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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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</section>
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<section id="methods">
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<title>Méthode utiles pour un composant graphique ColorButton</title>
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set_color(color) , where the color is defined as in the example, sets the color of the ColorButton, which by default is black. get_color() returns the color.
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In line 23 the "color-set" signal is connected to the callback function on_color_chosen() using widget.connect(signal, callback function) . See <link xref="signals-callbacks.py"/> for a more detailed explanation.
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</section>
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<section id="references">
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<title>Références API</title>
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Dans cet exemple, les éléments suivants sont utilisés :
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<list>
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<item><link href="http://developer.gnome.org/gtk3/unstable/GtkColorButton.html">GtkColorButton</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/unstable/GtkColorChooser.html">GtkColorChooser</link> </item>
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<item><link href="http://developer.gnome.org/gdk3/stable/gdk3-RGBA-Colors.html">RGBA Colors</link> </item>
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</list>
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</section>
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</page>
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