gnome-devel-docs 3.28.0-1 / usr / share / help / de / gnome-devel-demos / scrolledwindow.py.page

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<?xml version="1.0" encoding="utf-8"?>
<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="scrolledwindow.py" xml:lang="de">
  <info>
    <title type="text">ScrolledWindow (Python)</title>
    <link type="guide" xref="beginner.py#scrolling"/>
    <link type="next" xref="paned.py"/>
    <revision version="0.1" date="2012-05-26" status="draft"/>

    <credit type="author copyright">
      <name>Marta Maria Casetti</name>
      <email its:translate="no">mmcasetti@gmail.com</email>
      <years>2012</years>
    </credit>

    <desc>Adds scrollbars to its child widget</desc>
  
    <mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
      <mal:name>Mario Blättermann</mal:name>
      <mal:email>mario.blaettermann@gmail.com</mal:email>
      <mal:years>2011, 2013</mal:years>
    </mal:credit>
  </info>

  <title>ScrolledWindow</title>
  <media type="image" mime="image/png" src="media/scrolledwindow.png"/>
  <p>An image in a scrolled window.</p>

  <links type="section"/>

  <section id="code">
    <title>Code used to generate this example</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="ScrolledWindow Example", application=app)
        self.set_default_size(200, 200)

        # the scrolledwindow
        scrolled_window = Gtk.ScrolledWindow()
        scrolled_window.set_border_width(10)
        # there is always the scrollbar (otherwise: AUTOMATIC - only if needed
        # - or NEVER)
        scrolled_window.set_policy(
            Gtk.PolicyType.ALWAYS, Gtk.PolicyType.ALWAYS)

        # an image - slightly larger than the window...
        image = Gtk.Image()
        image.set_from_file("gnome-image.png")

        # add the image to the scrolledwindow
        scrolled_window.add_with_viewport(image)

        # add the scrolledwindow to the window
        self.add(scrolled_window)


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 ScrolledWindow widget</title>
    <list>
      <item><p><code>set_policy(hscrollbar_policy, vscrollbar_policy)</code> where each of the arguments is one of <code>Gtk.Policy.AUTOMATIC, Gtk.Policy.ALWAYS, Gtk.Policy.NEVER</code> regulates whether the horizontal and vertical scrollbars should appear: with <code>AUTOMATIC</code> they appear only if needed, <code>ALWAYS</code> and <code>NEVER</code> are self-explanatory.</p></item>
      <item><p><code>add_with_viewport(widget)</code> is used to add the Gtk.Widget <code>widget</code> without native scrolling capabilities inside the window.</p></item>
      <item><p><code>set_placement(window_placement)</code> sets the placement of the contents with respect to the scrollbars for the scrolled window. The options for the argument are <code>Gtk.CornerType.TOP_LEFT</code> (default: the scrollbars are on the bottom and on the right of the window), <code>Gtk.CornerType.TOP_RIGHT, Gtk.CornerType.BOTTOM_LEFT, Gtk.CornerType.BOTTOM_RIGHT</code>.</p></item>
      <item><p><code>set_hadjustment(adjustment)</code> and <code>set_vadjustment(adjustment)</code> set the Gtk.Adjustment <code>adjustment</code>. This is the representation of a value with a lower and upper bound, together with step and page increments, and a page size, and it is constructed as <code>Gtk.Adjustment(value, lower, upper, step_increment, page_increment, page_size)</code> where the fields are of type <code>float</code>. (Note that <code>step_increment</code> is not used in this case, it can be set to <code>0</code>.)</p></item>
    </list>
  </section>
  <section id="references">
    <title>API-Referenzen</title>
    <p>In this sample we used the following:</p>
    <list>
      <item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkScrolledWindow.html">GtkScrolledWindow</link></p></item>
      <item><p><link href="http://developer.gnome.org/gtk3/unstable/gtk3-Standard-Enumerations.html">Standard-Aufzählungen</link></p></item>
      <item><p><link href="http://developer.gnome.org/gtk3/unstable/GtkImage.html">GtkImage</link></p></item>
    </list>
  </section>
</page>

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