[gnome-devel-docs] tutorials C: Spinbutton sample/page

[Tiffany Antopolski <antopolski src gnome org>]

commit 5791ba344569ddf2e4e358af9c4afd64cc6040d3
Author: Monica Kochofar <monicakochofar gmail com>
Date:   Thu Jul 5 21:02:20 2012 -0400

    tutorials C: Spinbutton sample/page

 platform-demos/C/samples/spinbutton.c |   94 +++++++++++++++++++++++++++++++++
 platform-demos/C/spinbutton.c.page    |   40 ++++++++++++++
 2 files changed, 134 insertions(+), 0 deletions(-)
---
diff --git a/platform-demos/C/samples/spinbutton.c b/platform-demos/C/samples/spinbutton.c
new file mode 100644
index 0000000..3682e87
--- /dev/null
+++ b/platform-demos/C/samples/spinbutton.c
@@ -0,0 +1,94 @@
+#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;
+}
diff --git a/platform-demos/C/spinbutton.c.page b/platform-demos/C/spinbutton.c.page
new file mode 100644
index 0000000..cf19128
--- /dev/null
+++ b/platform-demos/C/spinbutton.c.page
@@ -0,0 +1,40 @@
+<?xml version='1.0' encoding='UTF-8'?>
+<page xmlns="http://projectmallard.org/1.0/";
+      xmlns:xi="http://www.w3.org/2001/XInclude";
+      type="guide" style="task"
+      id="spinbutton.c">
+  <info>
+    <link type="guide" xref="beginner.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>monicakochofar gmail com</email>
+      <years>2012</years>
+    </credit>
+
+    <desc>Retrieve an integer or floating point number</desc>
+  </info>
+
+  <title>SpinButton</title>
+
+   <media type="image" mime="image/png" src="media/spinbutton.png"/>
+    <p>Choose a number, by entering it or by clicking on the -/+ buttons!</p>
+
+      <code mime="text/x-csrc" style="numbered">
+<xi:include href="samples/spinbutton.c" parse="text"><xi:fallback/></xi:include></code>
+<p>
+  In this sample we used the following:
+</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>