[gnome-devel-docs] Added image viewer demo in C.

[Jonh Wendell <jwendell src gnome org>]

commit e356d38f243beadc54a40f272cfb402727c9b7ab
Author: Patricia Santana Cruz <patriciasantanacruz gmail com>
Date:   Fri Dec 3 17:31:32 2010 +0100

    Added image viewer demo in C.

 demos/image_viewer/firefox_test.jpg |  Bin 0 -> 20774 bytes
 demos/image_viewer/gtk_test.png     |  Bin 0 -> 29313 bytes
 demos/image_viewer/image_viewer.c   |   88 +++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 0 deletions(-)
---
diff --git a/demos/image_viewer/firefox_test.jpg b/demos/image_viewer/firefox_test.jpg
new file mode 100644
index 0000000..32d00e9
Binary files /dev/null and b/demos/image_viewer/firefox_test.jpg differ
diff --git a/demos/image_viewer/gtk_test.png b/demos/image_viewer/gtk_test.png
new file mode 100644
index 0000000..33c3e55
Binary files /dev/null and b/demos/image_viewer/gtk_test.png differ
diff --git a/demos/image_viewer/image_viewer.c b/demos/image_viewer/image_viewer.c
new file mode 100644
index 0000000..b34df0b
--- /dev/null
+++ b/demos/image_viewer/image_viewer.c
@@ -0,0 +1,88 @@
+#include <gtk/gtk.h>
+
+typedef struct _AppWidgets AppWidgets;
+
+struct _AppWidgets
+{
+   GtkWidget *window;
+   GtkWidget *image;
+};
+
+void on_open_button_clicked (GtkWidget *button, gpointer data);
+
+int main( int   argc,
+          char *argv[] )
+{
+    GtkWidget *scroll_window = NULL;
+    GtkWidget *open_button = NULL;
+    GtkWidget *hbox = NULL;
+    GtkWidget *vbox;
+    AppWidgets app_widgets;
+ 
+    gtk_init (&argc, &argv);
+    
+    app_widgets.window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+    gtk_window_set_default_size (GTK_WINDOW (app_widgets.window), 400, 400);
+    gtk_window_set_title (GTK_WINDOW (app_widgets.window), "Image Viewer Demo");
+    g_signal_connect (app_widgets.window, "destroy", G_CALLBACK (gtk_main_quit), NULL);
+
+    /* Sets the image.*/
+    app_widgets.image = gtk_image_new_from_file ("gtk_test.png");
+
+    /* Make window scrollable. */
+    scroll_window = gtk_scrolled_window_new (NULL, NULL); 
+    gtk_scrolled_window_add_with_viewport (GTK_SCROLLED_WINDOW (scroll_window), app_widgets.image);
+    gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (scroll_window), GTK_POLICY_AUTOMATIC, GTK_POLICY_AUTOMATIC);
+
+    /* Button's box. */
+    hbox = gtk_hbox_new (FALSE,5);
+
+    open_button = gtk_button_new_with_label( "Open...");
+    gtk_box_pack_start (GTK_BOX (hbox), open_button, TRUE, TRUE, 0);
+    g_signal_connect (open_button, "clicked",
+                      G_CALLBACK (on_open_button_clicked), &app_widgets);
+
+    /* Main window layout. */
+    vbox = gtk_vbox_new (FALSE,0);
+
+    gtk_box_pack_start (GTK_BOX (vbox), scroll_window, TRUE, TRUE, 0);
+    gtk_box_pack_start (GTK_BOX (vbox), hbox, FALSE, FALSE, 0);
+
+    gtk_container_add (GTK_CONTAINER (app_widgets.window), vbox);
+
+    gtk_widget_show_all  (app_widgets.window);
+    
+    gtk_main ();
+    
+    return 0;
+}
+void on_open_button_clicked (GtkWidget *button, gpointer data)
+{
+   GtkWidget *file_chooser_dialog = NULL;
+   GtkFileFilter *filter = NULL;
+   GFile *file = NULL;
+   char *filename;
+   AppWidgets *app_widgets = (AppWidgets *) data;
+
+   file_chooser_dialog = gtk_file_chooser_dialog_new ("Open file",
+                                         GTK_WINDOW (app_widgets->window),
+                                         GTK_FILE_CHOOSER_ACTION_OPEN,
+                                         GTK_STOCK_CANCEL, GTK_RESPONSE_CANCEL,
+                                         GTK_STOCK_OPEN, GTK_RESPONSE_ACCEPT,
+                                         NULL);
+
+   /* Show just image files. */
+   filter = gtk_file_filter_new ();
+   gtk_file_filter_add_pixbuf_formats (filter);
+   gtk_file_chooser_add_filter (GTK_FILE_CHOOSER (file_chooser_dialog), filter); 
+
+   if (gtk_dialog_run (GTK_DIALOG (file_chooser_dialog)) == GTK_RESPONSE_ACCEPT)
+   {
+      file = gtk_file_chooser_get_file (GTK_FILE_CHOOSER (file_chooser_dialog));
+      filename = g_file_get_basename (file);
+      gtk_image_set_from_file (GTK_IMAGE (app_widgets->image), filename);
+      
+      g_free (filename);
+   }
+   gtk_widget_destroy (file_chooser_dialog);
+}