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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="image.py" xml:lang="de">
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<info>
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<title type="text">Bild (Python)</title>
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<link type="guide" xref="beginner.py#display-widgets"/>
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<link type="seealso" xref="properties.py"/>
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<link type="next" xref="strings.py"/>
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<revision version="0.2" date="2012-06-14" 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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<credit type="editor">
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<name>Sindhu S</name>
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<email its:translate="no">sindhus@live.in</email>
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<years>2014</years>
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</credit>
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<desc>A widget displaying an image</desc>
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<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
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<mal:name>Mario Blättermann</mal:name>
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<mal:email>mario.blaettermann@gmail.com</mal:email>
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<mal:years>2011, 2013</mal:years>
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</mal:credit>
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</info>
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<title>Bild</title>
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<media type="image" mime="image/png" src="media/image.png"/>
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This GtkApplication displays an image file from the current directory.
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<note>
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If the image file is not loaded successfully, the image will contain a
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"broken image" icon. <file>filename.png</file> needs to be in the
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current directory for this code to work.
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</note>
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<links type="section"/>
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<section id="code">
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<title>Code used to generate this example</title>
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from gi.repository import Gtk
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import sys
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class MyWindow(Gtk.ApplicationWindow):
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# create a window
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def __init__(self, app):
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Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
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self.set_default_size(300, 300)
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# create an image
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image = Gtk.Image()
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# set the content of the image as the file filename.png
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image.set_from_file("gnome-image.png")
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# add the image to the window
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self.add(image)
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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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Another way to obtain what we have in the example is to create the image as
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an instance of another class and add it to the instance of
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MyWindow in the do_activate(self) method:
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# a class to create a window
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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="Welcome to GNOME", application=app)
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self.set_default_size(300, 300)
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# a class to create an image
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class MyImage(Gtk.Image):
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def __init__(self):
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Gtk.Image.__init__(self)
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self.set_from_file("gnome-image.png")
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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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# create an instance of MyWindow
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win = MyWindow(self)
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# create an instance of MyImage and add it to the window
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win.add(MyImage())
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# show the window and everything on it
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win.show_all()
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<note>
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To use this code snippet, you will need to add the code that imports
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Gtk and GdkPixbuf from gi.repository
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and lines that instantiate the MyApplication window.
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</note>
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</section>
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<section id="methods">
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<title>Useful methods for an Image widget</title>
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<list>
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<item>
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To load an image over a network use
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set_from_pixbuf(pixbuf) , where pixbuf is a
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<link href="https://developer.gnome.org/gdk-pixbuf/unstable/index.html">
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GdkPixbuf</link>.
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from gi.repository import Gtk
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from gi.repository import GdkPixbuf
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import sys
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class MyWindow(Gtk.ApplicationWindow):
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# create a window
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def __init__(self, app):
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Gtk.Window.__init__(self, title="Welcome to GNOME", application=app)
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self.set_default_size(300, 300)
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# create a pixbuf from file filename="gnome-image.png", with width=32
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# and height=64 amd boolean preserve_aspect_ratio=False.
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pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_scale("gnome-image.png", 64, 128, False)
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# create an image
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image = Gtk.Image()
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# set the content of the image as the pixbuf
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image.set_from_pixbuf(pixbuf)
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# add the image to the window
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self.add(image)
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If preserve_aspect_ratio=True we can use
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new_from_file_at_size(filename, width, height) . If
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width or height is -1 , it is
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not constrained.
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For loading from an input stream, see new_from_stream()
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and new_from_stream_at_scale() in the documentation.
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</item>
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</list>
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</section>
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<section id="references">
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<title>API-Referenzen</title>
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In this sample we used the following:
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<list>
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<item>
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<link href="https://developer.gnome.org/gtk3/unstable/GtkImage.html"> GtkImage</link>
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</item>
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<item>
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<link href="https://developer.gnome.org/gtk3/unstable/GtkWindow.html"> GtkWindow</link>
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</item>
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</list>
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</section>
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</page>
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