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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="de">
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<info>
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<title type="text">Scale (Vala)</title>
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<link type="guide" xref="beginner.vala#entry"/>
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<link type="seealso" xref="grid.vala"/>
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<link type="seealso" xref="label.vala"/>
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<revision version="0.1" date="2012-06-07" status="draft"/>
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<credit type="author copyright">
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<name>Tiffany Antopolski</name>
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<email its:translate="no">tiffany.antopolski@gmail.com</email>
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<years>2012</years>
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</credit>
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<desc>A slider widget for selecting a value from a range</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>Scale</title>
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<media type="image" mime="image/png" src="media/scale.png"/>
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Slide the scales!
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/* This is the application. */
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public class MyApplication : Gtk.Application {
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Gtk.Scale h_scale;
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Gtk.Scale v_scale;
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Gtk.Label label;
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/* Override the 'activate' signal of GLib.Application. */
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protected override void activate () {
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var window = new Gtk.ApplicationWindow (this);
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window.title = "Scale Example";
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window.set_default_size (400, 300);
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window.set_border_width (5);
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h_scale = new Gtk.Scale.with_range (Gtk.Orientation.HORIZONTAL, 0.0, 100.0, 5.0);
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h_scale.set_digits (0); //number of decimal places displayed
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h_scale.set_valign (Gtk.Align.START); //horizontal alignment
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var adjustment = new Gtk.Adjustment (42.0, 0.0, 100.0, 5.0, 10.0, 0.0);
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v_scale = new Gtk.Scale (Gtk.Orientation.VERTICAL, adjustment);
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v_scale.set_vexpand(true);
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label = new Gtk.Label ("Move the scale handles...");
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var grid = new Gtk.Grid ();
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grid.set_column_spacing (10); //amount of space between columns
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grid.set_column_homogeneous (true); //all columns same width
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grid.attach (h_scale, 0, 0, 1, 1);
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grid.attach_next_to (v_scale, h_scale, Gtk.PositionType.RIGHT, 1, 1);
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grid.attach (label, 0, 1, 2, 1);
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h_scale.value_changed.connect (scale_moved);
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v_scale.value_changed.connect (scale_moved);
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window.add (grid);
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window.show_all ();
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}
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/* Callback function for "value-changed" signal.
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* The parameter refers to the scale which emitted the signal.
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* Since we are accessing the values of not one, but two scales,
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* we made the ranges instance variables, and ignore the
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* parameter.
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*/
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void scale_moved (Gtk.Range range) {
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label.set_text ("Horizontal scale is %.1f; vertical scale is %.1f.".printf (h_scale.get_value (), v_scale.get_value ()));
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}
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}
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/* main creates and runs the application. */
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public int main (string[] args) {
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return new MyApplication ().run (args);
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}
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In this sample we used the following:
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<list>
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<item><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Scale.html">Gtk.Scale</link> </item>
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<item><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Adjustment.html">Gtk.Adjustment</link> </item>
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<item><link href="http://www.valadoc.org/gtk+-3.0/Gtk.PositionType.html">Gtk.PositionType</link> </item>
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<item><link href="http://www.valadoc.org/gtk+-3.0/Gtk.Orientation.html">Gtk.Orientation</link> </item>
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</list>
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</page>
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