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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="spinbutton.c" xml:lang="sv">
<info>
<title type="text">SpinButton (C)</title>
<link type="guide" xref="c#entry"/>
<link type="seealso" xref="scale.c"/>
<link type="seealso" xref="label.c"/>
<link type="seealso" xref="grid.c"/>
<revision version="0.2" date="2012-07-05" status="draft"/>
<credit type="author copyright">
<name>Monica Kochofar</name>
<email its:translate="no">monicakochofar@gmail.com</email>
<years>2012</years>
</credit>
<desc>Erhåll ett heltal eller ett flyttal</desc>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Sebastian Rasmussen</mal:name>
<mal:email>sebras@gmail.com</mal:email>
<mal:years>2019</mal:years>
</mal:credit>
<mal:credit xmlns:mal="http://projectmallard.org/1.0/" type="translator copyright">
<mal:name>Anders Jonsson</mal:name>
<mal:email>anders.jonsson@norsjovallen.se</mal:email>
<mal:years>2021</mal:years>
</mal:credit>
</info>
<title>SpinButton</title>
<media type="image" mime="image/png" src="media/spinbutton.png"/>
<p>Välj ett tal genom att mata in det eller genom att klicka på knapparna -/+!</p>
<code mime="text/x-csrc" style="numbered">
#include <gtk/gtk.h>
/* This is the callback function.
* It is a handler function which reacts to the signal.
* In this case, it will notify the user the value of their spinbutton
* as a label.
*/
static void
spin_clicked (GtkSpinButton *spinbutton,
gpointer user_data)
{
GtkWidget *label = user_data;
gint value = gtk_spin_button_get_value_as_int (spinbutton);
/* %d - Is used when printing integers.
* Note: Using g_strdup_printf returns a string that must be freed.
* (In which is done below)
*/
gchar *str = g_strdup_printf ("The number you selected is %d.", value);
gtk_label_set_text (GTK_LABEL (label), str);
g_free(str);
}
static void
activate (GtkApplication *app,
gpointer user_data)
{
/* Declare variables */
GtkWidget *window;
GtkWidget *label;
GtkWidget *grid;
GtkWidget *spin_button;
GtkAdjustment *adjustment;
/* Create a window with a title, a border width, and a default size */
window = gtk_application_window_new (app);
gtk_window_set_title (GTK_WINDOW (window), "SpinButton Example");
gtk_window_set_default_size (GTK_WINDOW (window), 210, 70);
gtk_container_set_border_width (GTK_CONTAINER (window), 5);
/* Create a label to be shown in the window */
label = gtk_label_new ("Choose a number");
/* Create an adjustment representing an adjustable bounded value */
adjustment = gtk_adjustment_new (0, 0, 100, 1, 0, 0);
/* Create a spin button that is to be as wide as possible */
spin_button = gtk_spin_button_new (adjustment, 1, 0);
gtk_widget_set_hexpand (spin_button, TRUE);
/* Connecting the "value-changed" signal for the spinbutton
* to the appropriate callback function.
*/
g_signal_connect (spin_button,
"value-changed",
G_CALLBACK (spin_clicked),
label);
/* Create a grid and arrange everything accordingly */
grid = gtk_grid_new ();
gtk_grid_set_column_spacing (GTK_GRID (grid), 10);
gtk_grid_set_column_homogeneous (GTK_GRID (grid), TRUE);
gtk_grid_attach (GTK_GRID (grid), spin_button, 0, 0, 1, 1);
gtk_grid_attach (GTK_GRID (grid), label, 0, 1, 1, 1);
gtk_container_add (GTK_CONTAINER (window), grid);
gtk_widget_show_all (window);
}
int
main (int argc, char **argv)
{
GtkApplication *app;
int status;
app = gtk_application_new ("org.gtk.example", G_APPLICATION_FLAGS_NONE);
g_signal_connect (app, "activate", G_CALLBACK (activate), NULL);
status = g_application_run (G_APPLICATION (app), argc, argv);
g_object_unref (app);
return status;
}
</code>
<p>I detta exempel använde vi följande:</p>
<list>
<item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkApplication.html">GtkApplication</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/3.4/GtkWindow.html">GtkWindow</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkSpinButton.html">GtkSpinButton</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkLabel.html">GtkLabel</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkAdjustment.html">GtkAdjustment</link></p></item>
<item><p><link href="http://developer.gnome.org/gtk3/stable/GtkGrid.html">GtkGrid</link></p></item>
</list>
</page>
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