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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.c" xml:lang="de">
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<info>
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<title type="text">Scale (C)</title>
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<link type="guide" xref="c#entry"/>
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<link type="seealso" xref="grid.c"/>
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<link type="seealso" xref="label.c"/>
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<revision version="0.2" date="2012-07-04" status="draft"/>
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<credit type="author copyright">
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<name>Monica Kochofar</name>
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<email its:translate="no">monicakochofar@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/scale2.png"/>
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Slide the scales!
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#include <gtk/gtk.h>
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/* This is the callback function.
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* It is a handler function which reacts to the signal.
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* In this case, it will notify the user the value of their scale as a label.
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*/
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static void
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hscale_moved (GtkRange *range,
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gpointer user_data)
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{
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GtkWidget *label = user_data;
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/* Get the value of the range, and convert it into a string which will be
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* used as a new label for the horizontal scale.
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* %.0f - stands for a double that will have 0 decimal places.
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*/
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gdouble pos = gtk_range_get_value (range);
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/* Note: Using g_strdup_printf returns a string that must be freed.
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* (In which is done below)
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*/
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gchar *str = g_strdup_printf ("Horizontal scale is %.0f", pos);
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gtk_label_set_text (GTK_LABEL (label), str);
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g_free(str);
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}
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/* This is the second callback function. It is a handler function which
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* reacts to the signal. It does the same thing as the function above, except with
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* the vertical scale.
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*/
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vscale_moved (GtkRange *range,
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gpointer user_data)
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{
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GtkWidget *label = user_data;
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gdouble pos = gtk_range_get_value (range);
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/* %.1f - stands for a double that will have 1 decimal place */
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gchar *str = g_strdup_printf ("Vertical scale is %.1f", pos);
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gtk_label_set_text (GTK_LABEL (label), str);
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g_free (str);
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}
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static void
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activate (GtkApplication *app,
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gpointer user_data)
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{
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/* Declare variables */
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GtkWidget *window;
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GtkWidget *h_scale;
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GtkWidget *v_scale;
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GtkWidget *hlabel;
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GtkWidget *vlabel;
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GtkWidget *grid;
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/* The Adjustment object represents a value
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* which has an associated lower and upper bound.
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*/
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GtkAdjustment *hadjustment;
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GtkAdjustment *vadjustment;
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/* Create a window with a title and a default size */
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window = gtk_application_window_new (app);
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gtk_window_set_title (GTK_WINDOW (window), "Scale Example");
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gtk_window_set_default_size (GTK_WINDOW (window), 400, 300);
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gtk_container_set_border_width (GTK_CONTAINER (window), 5);
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/* Two labels to be shown in the window */
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hlabel = gtk_label_new ("Move the scale handle...");
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vlabel = gtk_label_new ("Move the scale handle...");
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/* gtk_adjustment_new takes six parameters, three of which
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* may be difficult to understand:
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* step increment- move the handle with the arrow keys on your keyboard to see.
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* page increment - move the handle by clicking away from it
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* on the scale to see.
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* page size - not used here.
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*/
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hadjustment = gtk_adjustment_new (0, 0, 100, 5, 10, 0);
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vadjustment = gtk_adjustment_new (50, 0, 100, 5, 10, 0);
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/* Create the Horizontal scale, making sure the
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* digits used have no decimals.
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*/
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h_scale = gtk_scale_new (GTK_ORIENTATION_HORIZONTAL, hadjustment);
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gtk_scale_set_digits (GTK_SCALE (h_scale), 0);
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/* Allow it to expand horizontally (if there's space), and
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* set the vertical alignment
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*/
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gtk_widget_set_hexpand (h_scale, TRUE);
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gtk_widget_set_valign (h_scale, GTK_ALIGN_START);
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/* Connecting the "value-changed" signal for the horizontal scale
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* to the appropriate callback function.
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* take note that GtkRange is part of GtkScale's Object Hierarchy.
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*/
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g_signal_connect (h_scale,
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"value-changed",
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G_CALLBACK (hscale_moved),
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hlabel);
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/* Create the Vertical scale. This time, we will see what happens
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* when the digits arent initially set.
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*/
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v_scale = gtk_scale_new (GTK_ORIENTATION_VERTICAL, vadjustment);
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gtk_widget_set_vexpand (v_scale, TRUE);
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/* Connecting the "value-changed" signal for the vertical scale to
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* the appropriate callback function.
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*/
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g_signal_connect (v_scale,
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"value-changed",
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G_CALLBACK (vscale_moved),
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vlabel);
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/* Create a grid and arrange everything accordingly */
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grid = gtk_grid_new ();
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gtk_grid_set_column_spacing (GTK_GRID (grid), 10);
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gtk_grid_set_column_homogeneous (GTK_GRID (grid), TRUE);
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gtk_grid_attach (GTK_GRID (grid), h_scale, 0, 0, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), v_scale, 1, 0, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), hlabel, 0, 1, 1, 1);
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gtk_grid_attach (GTK_GRID (grid), vlabel, 1, 1, 1, 1);
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gtk_container_add (GTK_CONTAINER (window), grid);
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gtk_widget_show_all (window);
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}
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int
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main (int argc, char **argv)
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{
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GtkApplication *app;
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int status;
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app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
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g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
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status = g_application_run (G_APPLICATION (app), argc, argv);
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g_object_unref (app);
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return status;
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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://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkScale.html">GtkScale</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkRange.html">GtkRange</link> </item>
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<item><link href="http://developer.gnome.org/gtk3/stable/GtkAdjustment.html">GtkAdjustment</link> </item>
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<item><link href="http://developer.gnome.org/glib/stable/glib-String-Utility-Functions.html#g-strdup-printf">String Utility Functions</link> </item>
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</list>
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</page>
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