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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="fontchooserwidget.py" xml:lang="gl">
<info>
<title type="text">FontChooserWidget (Python)</title>
<link type="guide" xref="beginner.py#font-selectors"/>
<link type="seealso" xref="signals-callbacks.py"/>
<link type="next" xref="filechooserdialog.py"/>
<revision version="0.2" date="2012-05-05" status="draft"/>
<credit type="author copyright">
<name>Marta Maria Casetti</name>
<email its:translate="no">mmcasetti@gmail.com</email>
<years>2012</years>
</credit>
<desc>A widget to choose a font</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Fran Dieguez</mal:name>
<mal:email>frandieguez@gnome.org</mal:email>
<mal:years>2012-2013.</mal:years>
</mal:credit>
</info>
<title>FontChooserWidget</title>
<media type="image" mime="image/png" src="media/fontchooserwidget.png"/>
<p>A FontChooserWidget with a callback function.</p>
<links type="section"/>
<section id="code">
<title>Código usado para xerar este exemplo</title>
<code mime="text/x-python" style="numbered">from gi.repository import Gtk
import sys
class MyWindow(Gtk.ApplicationWindow):
def __init__(self, app):
Gtk.Window.__init__(self, title="FontChooserWidget", application=app)
# a font chooser
self.font_chooser = Gtk.FontChooserWidget()
# a default font
self.font_chooser.set_font("Sans")
# a text to preview the font
self.font_chooser.set_preview_text(
"This is an example of preview text!")
# connect signal from the font chooser to the callback function
self.font_chooser.connect("notify::font", self.font_cb)
# add the font chooser to the window
self.add(self.font_chooser)
# callback function:
def font_cb(self, event, user_data):
# print in the terminal
print("You chose the font " + self.font_chooser.get_font())
class MyApplication(Gtk.Application):
def __init__(self):
Gtk.Application.__init__(self)
def do_activate(self):
win = MyWindow(self)
win.show_all()
def do_startup(self):
Gtk.Application.do_startup(self)
app = MyApplication()
exit_status = app.run(sys.argv)
sys.exit(exit_status)
</code>
</section>
<section id="methods">
<title>Useful methods for a FontChooserWidget</title>
<p>In line 16 the <code>"notify::font"</code> signal from the widget is connected to the callback function <code>font_cb()</code> using <code><var>widget</var>.connect(<var>signal</var>, <var>callback function</var>)</code>. See <link xref="signals-callbacks.py"/> for a more detailed explanation.</p>
<list>
<item><p>To set the font which is initially selected, use <code>set_font(font)</code> (where <code>font</code> is the font name) or <code>set_font_desc(font)</code> (where <code>font</code> is the PangoFontDescription).</p></item>
<item><p>To get the selected font use <code>get_font()</code> or <code>get_font_desc()</code>.</p></item>
<item><p>To change the text which is shown in the preview area, use <code>set_preview_text()</code>. </p></item>
</list>
</section>
<section id="references">
<title>API References</title>
<p>Neste exemplo empregaremos o seguinte:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkFontChooserWidget.html">GtkFontChooserWidget</link></p></item>
</list>
</section>
</page>
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