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<page xmlns="http://projectmallard.org/1.0/"
xmlns:xi="http://www.w3.org/2001/XInclude"
type="guide" style="task"
id="label.py">
<info>
<title type="text">Label (Python)</title>
<link type="guide" xref="beginner.py#display-widgets"/>
<link type="seealso" xref="properties.py" />
<link type="seealso" xref="strings.py" />
<link type="next" xref="properties.py" />
<revision version="0.2" date="2012-06-18" status="draft"/>
<credit type="author copyright">
<name>Marta Maria Casetti</name>
<email>mmcasetti@gmail.com</email>
<years>2012</years>
</credit>
<credit type="author">
<name>Sebastian Pölsterl</name>
<email>sebp@k-d-w.org</email>
<years>2012</years>
</credit>
<desc>A widget that displays a small to medium amount of text</desc>
</info>
<title>Label</title>
<media type="image" mime="image/png" src="media/label.png"/>
<p>A simple label</p>
<links type="section" />
<section id="code">
<title>Code used to generate this example</title>
<code mime="text/x-python" style="numbered"><xi:include href="samples/label.py" parse="text"><xi:fallback/></xi:include></code>
<p>Another way to obtain what we have in the example is to create the label as an instance of another class and add it to the instance of <code>MyWindow</code> in the <code>do_activate(self)</code> method:</p>
<code mime="text/x-python">
# a class to define a window
class MyWindow(Gtk.ApplicationWindow):
def __init__(self, app):
Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
self.set_default_size(200, 100)
# a class to define a label
class MyLabel(Gtk.Label):
def __init__(self):
Gtk.Label.__init__(self)
self.set_text("Hello GNOME!")
class MyApplication(Gtk.Application):
def __init__(self):
Gtk.Application.__init__(self)
def do_activate(self):
# create an instance of MyWindow
win = MyWindow(self)
# create an instance of MyLabel
label = MyLabel()
# and add it to the window
win.add(label)
# show the window and everything on it
win.show_all()</code>
</section>
<section id="methods">
<title>Useful methods for a Label widget</title>
<p>An explanation of how to deal with strings in GTK+ can be found in <link xref="strings.py" />.</p>
<list>
<item><p><code>set_line_wrap(True)</code> breaks lines if the text of the label exceeds the size of the widget.</p></item>
<item><p><code>set_justify(Gtk.Justification.LEFT)</code> (or <code>Gtk.Justification.RIGHT, Gtk.Justification.CENTER, Gtk.Justification.FILL</code>) sets the alignment of the lines in the text of the label relative to each other. The method has no effect on a single-line label.</p></item>
<item><p>For decorated text we can use <code>set_markup("text")</code>, where <code>"text"</code> is a text in the <link href="http://developer.gnome.org/pango/stable/PangoMarkupFormat.html">Pango Markup Language</link>. An example:</p>
<code mime="text/x-python"><![CDATA[
label.set_markup("Text can be <small>small</small>, <big>big</big>, "
"<b>bold</b>, <i>italic</i> and even point to somewhere "
"in the <a href=\"http://www.gtk.org\" "
"title=\"Click to find out more\">internets</a>.")]]></code>
</item>
</list>
</section>
<section id="references">
<title>API References</title>
<p>In this sample we used the following:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkLabel.html">GtkLabel</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkWindow.html">GtkWindow</link></p></item>
</list>
</section>
</page>
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