/usr/share/help/cs/gnome-devel-demos/scale.vala.page is in gnome-devel-docs 3.28.0-1.
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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="scale.vala" xml:lang="cs">
<info>
<title type="text">Scale (Vala)</title>
<link type="guide" xref="beginner.vala#entry"/>
<link type="seealso" xref="grid.vala"/>
<link type="seealso" xref="label.vala"/>
<revision version="0.1" date="2012-06-07" status="draft"/>
<credit type="author copyright">
<name>Tiffany Antopolski</name>
<email its:translate="no">tiffany.antopolski@gmail.com</email>
<years>2012</years>
</credit>
<desc>Widget stupnice pro výběr hodnoty z nějakého rozsahu</desc>
</info>
<title>Scale</title>
<media type="image" mime="image/png" src="media/scale.png"/>
<p>Jezděte po stupnici!</p>
<code mime="text/x-csharp" style="numbered">/* Toto je aplikace. */
public class MyApplication : Gtk.Application {
Gtk.Scale h_scale;
Gtk.Scale v_scale;
Gtk.Label label;
/* Přepíše signál "activate" z GLib.Application. */
protected override void activate () {
var window = new Gtk.ApplicationWindow (this);
window.title = "Scale Example";
window.set_default_size (400, 300);
window.set_border_width (5);
h_scale = new Gtk.Scale.with_range (Gtk.Orientation.HORIZONTAL, 0.0, 100.0, 5.0);
h_scale.set_digits (0); //number of decimal places displayed
h_scale.set_valign (Gtk.Align.START); //horizontal alignment
var adjustment = new Gtk.Adjustment (42.0, 0.0, 100.0, 5.0, 10.0, 0.0);
v_scale = new Gtk.Scale (Gtk.Orientation.VERTICAL, adjustment);
v_scale.set_vexpand(true);
label = new Gtk.Label ("Move the scale handles...");
var grid = new Gtk.Grid ();
grid.set_column_spacing (10); //amount of space between columns
grid.set_column_homogeneous (true); //all columns same width
grid.attach (h_scale, 0, 0, 1, 1);
grid.attach_next_to (v_scale, h_scale, Gtk.PositionType.RIGHT, 1, 1);
grid.attach (label, 0, 1, 2, 1);
h_scale.value_changed.connect (scale_moved);
v_scale.value_changed.connect (scale_moved);
window.add (grid);
window.show_all ();
}
/* Funkce zpětného volání pro signál "value-changed".
* Parametr odkazuje na stupnici, která signál vyslala.
* Protože přistupujeme k hodnotě ne jedné, ale dvou stupnic,
* vytvoříme proměnné s instancemi rozsahů a parametr budeme
* ignorovat.
*/
void scale_moved (Gtk.Range range) {
label.set_text ("Horizontal scale is %.1f; vertical scale is %.1f.".printf (h_scale.get_value (), v_scale.get_value ()));
}
}
/* main vytvoří a spustí aplikaci. */
public int main (string[] args) {
return new MyApplication ().run (args);
}
</code>
<p>V této ukázce se používá následující:</p>
<list>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Scale.html">Gtk.Scale</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Adjustment.html">Gtk.Adjustment</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.PositionType.html">Gtk.PositionType</link></p></item>
<item><p><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Orientation.html">Gtk.Orientation</link></p></item>
</list>
</page>
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