[gtk+] gtk3-demo: Add a cursors demo

[Matthias Clasen <matthiasc src gnome org>]

commit 36006eb91824612cb25031101143fd70be68aa9d
Author: Matthias Clasen <mclasen redhat com>
Date:   Thu May 7 20:01:14 2015 -0400

    gtk3-demo: Add a cursors demo

 demos/gtk-demo/Makefile.am        |    1 +
 demos/gtk-demo/cursors.c          |  221 +++++++++++++++++++++++++++++++++++++
 demos/gtk-demo/demo.gresource.xml |    1 +
 3 files changed, 223 insertions(+), 0 deletions(-)
---
diff --git a/demos/gtk-demo/Makefile.am b/demos/gtk-demo/Makefile.am
index 183d109..d31e6be 100644
--- a/demos/gtk-demo/Makefile.am
+++ b/demos/gtk-demo/Makefile.am
@@ -17,6 +17,7 @@ demos =                                               \
        css_multiplebgs.c                       \
        css_pixbufs.c                           \
        css_shadows.c                           \
+       cursors.c                               \
        dialog.c                                \
        drawingarea.c                           \
        editable_cells.c                        \
diff --git a/demos/gtk-demo/cursors.c b/demos/gtk-demo/cursors.c
new file mode 100644
index 0000000..d6046ee
--- /dev/null
+++ b/demos/gtk-demo/cursors.c
@@ -0,0 +1,221 @@
+/* Cursors
+ *
+ * Demonstrates a useful set of available cursors.
+ */
+#include <gtk/gtk.h>
+
+static void
+set_cursor (GtkWidget *button, gpointer data)
+{
+  GtkWidget *toplevel;
+  GdkCursor *cursor = data;
+  GdkWindow *window;
+
+  toplevel = gtk_widget_get_toplevel (button);
+  window = gtk_widget_get_window (toplevel);
+  gdk_window_set_cursor (window, cursor);
+}
+
+static GtkWidget *
+add_section (GtkWidget   *box,
+             const gchar *heading)
+{
+  GtkWidget *label;
+  GtkWidget *section;
+
+  label = gtk_label_new (heading);
+  gtk_label_set_xalign (GTK_LABEL (label), 0.0);
+  gtk_widget_set_margin_top (label, 10);
+  gtk_widget_set_margin_bottom (label, 10);
+  gtk_box_pack_start (GTK_BOX (box), label, FALSE, TRUE, 0);
+  section = gtk_flow_box_new ();
+  gtk_widget_set_halign (section, GTK_ALIGN_START);
+  gtk_flow_box_set_selection_mode (GTK_FLOW_BOX (section), GTK_SELECTION_NONE);
+  gtk_flow_box_set_min_children_per_line (GTK_FLOW_BOX (section), 2);
+  gtk_flow_box_set_max_children_per_line (GTK_FLOW_BOX (section), 20);
+  gtk_box_pack_start (GTK_BOX (box), section, FALSE, TRUE, 0);
+
+  return section;
+}
+
+/* Map css cursor names to cursors commonly available in cursor themes */
+static const struct {
+  const char *css_name, *name;
+} name_map[] = {
+  { "default", "left_ptr" },
+  { "none", NULL },
+  { "help", "help" },
+  { "context-menu", "context-menu" },
+  { "pointer", "hand" },
+  { "progress", "left_ptr_watch" },
+  { "wait", "watch" },
+  { "cell", "crosshair" },
+  { "crosshair", "tcross" },
+  { "text", "xterm" },
+  { "vertical-text", "vertical-text" },
+  { "alias", "dnd-link" },
+  { "copy", "dnd-copy" },
+  { "move", "move" },
+  { "no-drop", "dnd-none" },
+  { "not-allowed", "crossed_circle" },
+  { "grab", "grab" },
+  { "grabbing", "grabbing" },
+  { "all-scroll", "all-scroll" },
+  { "col-resize", "h_double_arrow" },
+  { "row-resize", "v_double_arrow" },
+  { "n-resize", "top_side" },
+  { "e-resize", "right_side" },
+  { "s-resize", "bottom_side" },
+  { "w-resize", "left_side" },
+  { "ne-resize", "top_right_corner" },
+  { "nw-resize", "top_left_corner" },
+  { "sw-resize", "bottom_left_corner" },
+  { "se-resize", "bottom_right_corner" },
+  { "ew-resize", "h_double_arrow" },
+  { "ns-resize", "v_double_arrow" },
+  { "nesw-resize", "fd_double_arrow" },
+  { "nwse-resize", "bd_double_arrow" },
+  { "zoom-in", "zoom-in" },
+  { "zoome-out", "zoom-out" },
+  { NULL, NULL }
+};
+
+static const gchar *
+lookup_name (const gchar *css_name)
+{
+  gint i;
+
+  for (i = 0; name_map[i].css_name; i++)
+    {
+      if (g_strcmp0 (name_map[i].css_name, css_name) == 0)
+        return name_map[i].name;
+    }
+
+  return css_name;
+}
+
+static void
+add_button (GtkWidget   *section,
+            const gchar *css_name)
+{
+  GtkWidget *image, *button;
+  GdkDisplay *display;
+  GdkCursor *cursor;
+  const gchar *name;
+
+  name = lookup_name (css_name);
+
+  display = gtk_widget_get_display (section);
+  if (name == NULL)
+    cursor = gdk_cursor_new_for_display (display, GDK_BLANK_CURSOR);
+  else
+    cursor = gdk_cursor_new_from_name (display, name);
+  if (cursor == NULL)
+    image = gtk_image_new_from_icon_name ("image-missing", GTK_ICON_SIZE_MENU);
+  else
+    image = gtk_image_new_from_pixbuf (gdk_cursor_get_image (cursor));
+  gtk_widget_set_size_request (image, 24, 24);
+  button = gtk_button_new ();
+  gtk_container_add (GTK_CONTAINER (button), image);
+  gtk_style_context_add_class (gtk_widget_get_style_context (button), "image-button");
+  g_signal_connect (button, "clicked", G_CALLBACK (set_cursor), cursor);
+
+  gtk_widget_set_tooltip_text (button, css_name);
+  gtk_container_add (GTK_CONTAINER (section), button);
+}
+
+GtkWidget *
+do_cursors (GtkWidget *do_widget)
+{
+  static GtkWidget *window = NULL;
+
+  if (!window)
+    {
+      GtkWidget *sw;
+      GtkWidget *box;
+      GtkWidget *section;
+
+      window = gtk_window_new (GTK_WINDOW_TOPLEVEL);
+      gtk_window_set_screen (GTK_WINDOW (window),
+                             gtk_widget_get_screen (do_widget));
+      gtk_window_set_title (GTK_WINDOW (window), "Cursors");
+      gtk_window_set_default_size (GTK_WINDOW (window), 500, 500);
+
+      g_signal_connect (window, "destroy",
+                        G_CALLBACK (gtk_widget_destroyed),
+                        &window);
+
+      sw = gtk_scrolled_window_new (NULL, NULL);
+      gtk_scrolled_window_set_policy (GTK_SCROLLED_WINDOW (sw),
+                                      GTK_POLICY_NEVER,
+                                      GTK_POLICY_AUTOMATIC);
+      gtk_container_add (GTK_CONTAINER (window), sw);
+      box = gtk_box_new (GTK_ORIENTATION_VERTICAL, 0);
+      g_object_set (box,
+                    "margin-start", 20,
+                    "margin-end", 20,
+                    "margin-bottom", 10,
+                    NULL);
+      gtk_container_add (GTK_CONTAINER (sw), box);
+
+      section = add_section (box, "General");
+      add_button (section, "default");
+      add_button (section, "none");
+
+      section = add_section (box, "Link & Status");
+      add_button (section, "context-menu");
+      add_button (section, "help");
+      add_button (section, "pointer");
+      add_button (section, "progress");
+      add_button (section, "wait");
+
+      section = add_section (box, "Selection");
+      add_button (section, "cell");
+      add_button (section, "crosshair");
+      add_button (section, "text");
+      add_button (section, "vertical-text");
+
+      section = add_section (box, "Drag & Drop");
+      add_button (section, "alias");
+      add_button (section, "copy");
+      add_button (section, "move");
+      add_button (section, "no-drop");
+      add_button (section, "not-allowed");
+      add_button (section, "grab");
+      add_button (section, "grabbing");
+
+      section = add_section (box, "Resize & Scrolling");
+      add_button (section, "all-scroll");
+      add_button (section, "col-resize");
+      add_button (section, "row-resize");
+      add_button (section, "n-resize");
+      add_button (section, "e-resize");
+      add_button (section, "s-resize");
+      add_button (section, "w-resize");
+      add_button (section, "ne-resize");
+      add_button (section, "nw-resize");
+      add_button (section, "se-resize");
+      add_button (section, "sw-resize");
+      add_button (section, "ew-resize");
+      add_button (section, "ns-resize");
+      add_button (section, "nesw-resize");
+      add_button (section, "nwse-resize");
+
+      section = add_section (box, "Zoom");
+      add_button (section, "zoom-in");
+      add_button (section, "zoom-out");
+    }
+
+  if (!gtk_widget_get_visible (window))
+    {
+      gtk_widget_show_all (window);
+    }
+  else
+    {
+      gtk_widget_destroy (window);
+      window = NULL;
+    }
+
+
+  return window;
+}
diff --git a/demos/gtk-demo/demo.gresource.xml b/demos/gtk-demo/demo.gresource.xml
index a970795..91db2a5 100644
--- a/demos/gtk-demo/demo.gresource.xml
+++ b/demos/gtk-demo/demo.gresource.xml
@@ -86,6 +86,7 @@
     <file>css_multiplebgs.c</file>
     <file>css_pixbufs.c</file>
     <file>css_shadows.c</file>
+    <file>cursors.c</file>
     <file>dialog.c</file>
     <file>drawingarea.c</file>
     <file>editable_cells.c</file>