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examples/actor-model: Clean up and comment
This is an example so it ought to be a bit more didactic.
This commit is contained in:
Emmanuele Bassi
parent
365bd482fb
commit
bf0ca91662
@ -2,194 +2,14 @@
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#include <gio/gio.h>
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#include <clutter/clutter.h>
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/* {{{ MenuItem */
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#define EXAMPLE_TYPE_MENU_ITEM (example_menu_item_get_type ())
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G_DECLARE_FINAL_TYPE (ExampleMenuItem, example_menu_item, EXAMPLE, MENU_ITEM, ClutterText)
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struct _ExampleMenuItem
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{
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ClutterText parent_instance;
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gboolean is_selected;
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};
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struct _ExampleMenuItemClass
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{
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ClutterTextClass parent_class;
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};
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G_DEFINE_TYPE (ExampleMenuItem, example_menu_item, CLUTTER_TYPE_TEXT)
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enum {
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MENU_ITEM_PROP_SELECTED = 1,
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MENU_ITEM_N_PROPS
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};
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static GParamSpec *menu_item_props[MENU_ITEM_N_PROPS] = { NULL, };
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static void
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example_menu_item_set_selected (ExampleMenuItem *self,
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gboolean selected)
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{
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selected = !!selected;
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if (self->is_selected == selected)
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return;
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self->is_selected = selected;
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if (self->is_selected)
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clutter_text_set_color (CLUTTER_TEXT (self), CLUTTER_COLOR_LightSkyBlue);
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else
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clutter_text_set_color (CLUTTER_TEXT (self), CLUTTER_COLOR_White);
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g_object_notify_by_pspec (G_OBJECT (self), menu_item_props[MENU_ITEM_PROP_SELECTED]);
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}
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static void
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example_menu_item_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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switch (prop_id)
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{
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case MENU_ITEM_PROP_SELECTED:
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example_menu_item_set_selected (EXAMPLE_MENU_ITEM (gobject),
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g_value_get_boolean (value));
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break;
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}
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}
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static void
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example_menu_item_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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switch (prop_id)
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{
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case MENU_ITEM_PROP_SELECTED:
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g_value_set_boolean (value, EXAMPLE_MENU_ITEM (gobject)->is_selected);
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break;
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}
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}
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static void
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example_menu_item_class_init (ExampleMenuItemClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = example_menu_item_set_property;
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gobject_class->get_property = example_menu_item_get_property;
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menu_item_props[MENU_ITEM_PROP_SELECTED] =
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g_param_spec_boolean ("selected", NULL, NULL,
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FALSE,
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G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, MENU_ITEM_N_PROPS, menu_item_props);
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}
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static void
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example_menu_item_init (ExampleMenuItem *self)
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{
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ClutterText *text = CLUTTER_TEXT (self);
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ClutterActor *actor = CLUTTER_ACTOR (self);
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clutter_text_set_font_name (text, "Sans Bold 24px");
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clutter_text_set_color (text, CLUTTER_COLOR_White);
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clutter_actor_set_margin_left (actor, 12);
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clutter_actor_set_margin_right (actor, 12);
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}
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/* }}} */
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/* {{{ Menu */
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#define EXAMPLE_TYPE_MENU (example_menu_get_type ())
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G_DECLARE_FINAL_TYPE (ExampleMenu, example_menu, EXAMPLE, MENU, ClutterActor)
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struct _ExampleMenu
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{
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ClutterActor parent_instance;
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int current_idx;
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};
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struct _ExampleMenuClass
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{
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ClutterActorClass parent_class;
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};
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G_DEFINE_TYPE (ExampleMenu, example_menu, CLUTTER_TYPE_ACTOR)
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static void
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example_menu_class_init (ExampleMenuClass *klass)
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{
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}
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static void
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example_menu_init (ExampleMenu *self)
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{
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ClutterActor *actor = CLUTTER_ACTOR (self);
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ClutterLayoutManager *layout;
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layout = clutter_box_layout_new ();
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clutter_box_layout_set_orientation (CLUTTER_BOX_LAYOUT (layout), CLUTTER_ORIENTATION_VERTICAL);
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clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (layout), 12);
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clutter_actor_set_layout_manager (actor, layout);
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clutter_actor_set_background_color (actor, CLUTTER_COLOR_Black);
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self->current_idx = -1;
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}
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static ClutterActor *
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example_menu_select_item (ExampleMenu *self,
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int idx)
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{
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ClutterActor *item;
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if (idx == self->current_idx)
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return clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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item = clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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if (item != NULL)
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example_menu_item_set_selected ((ExampleMenuItem *) item, FALSE);
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if (idx < 0)
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idx = clutter_actor_get_n_children (CLUTTER_ACTOR (self)) - 1;
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else if (idx >= clutter_actor_get_n_children (CLUTTER_ACTOR (self)))
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idx = 0;
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self->current_idx = idx;
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item = clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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if (item != NULL)
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example_menu_item_set_selected ((ExampleMenuItem *) item, TRUE);
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return item;
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}
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static ClutterActor *
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example_menu_select_next (ExampleMenu *self)
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{
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return example_menu_select_item (self, self->current_idx + 1);
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}
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static ClutterActor *
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example_menu_select_prev (ExampleMenu *self)
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{
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return example_menu_select_item (self, self->current_idx - 1);
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}
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/* }}} */
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/* {{{ MenuItemModel */
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#define EXAMPLE_TYPE_MENU_ITEM_MODEL (example_menu_item_model_get_type ())
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/* This is our "model" of a Menu item; it has a "label" property, and
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* a "selected" state property. The user is supposed to operate on the
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* model instance, and change its state.
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*/
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#define EXAMPLE_TYPE_MENU_ITEM_MODEL (example_menu_item_model_get_type ())
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G_DECLARE_FINAL_TYPE (ExampleMenuItemModel, example_menu_item_model, EXAMPLE, MENU_ITEM_MODEL, GObject)
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@ -294,6 +114,204 @@ example_menu_item_model_init (ExampleMenuItemModel *self)
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}
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/* }}} */
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/* {{{ MenuItem */
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/* This is our "view" of a Menu item; it changes state depending on whether
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* the "selected" property is set. The "view" reflects the state of the
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* "model" instance, though it has no direct connection to it.
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*/
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#define EXAMPLE_TYPE_MENU_ITEM_VIEW (example_menu_item_view_get_type ())
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G_DECLARE_FINAL_TYPE (ExampleMenuItemView, example_menu_item_view, EXAMPLE, MENU_ITEM_VIEW, ClutterText)
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struct _ExampleMenuItemView
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{
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ClutterText parent_instance;
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gboolean is_selected;
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};
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struct _ExampleMenuItemViewClass
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{
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ClutterTextClass parent_class;
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};
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G_DEFINE_TYPE (ExampleMenuItemView, example_menu_item_view, CLUTTER_TYPE_TEXT)
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enum {
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MENU_ITEM_VIEW_PROP_SELECTED = 1,
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MENU_ITEM_VIEW_N_PROPS
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};
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static GParamSpec *menu_item_view_props[MENU_ITEM_VIEW_N_PROPS] = { NULL, };
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static void
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example_menu_item_view_set_selected (ExampleMenuItemView *self,
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gboolean selected)
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{
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selected = !!selected;
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if (self->is_selected == selected)
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return;
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self->is_selected = selected;
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if (self->is_selected)
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clutter_text_set_color (CLUTTER_TEXT (self), CLUTTER_COLOR_LightSkyBlue);
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else
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clutter_text_set_color (CLUTTER_TEXT (self), CLUTTER_COLOR_White);
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g_object_notify_by_pspec (G_OBJECT (self), menu_item_view_props[MENU_ITEM_VIEW_PROP_SELECTED]);
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}
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static void
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example_menu_item_view_set_property (GObject *gobject,
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guint prop_id,
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const GValue *value,
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GParamSpec *pspec)
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{
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switch (prop_id)
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{
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case MENU_ITEM_VIEW_PROP_SELECTED:
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example_menu_item_view_set_selected (EXAMPLE_MENU_ITEM_VIEW (gobject),
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g_value_get_boolean (value));
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break;
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}
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}
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static void
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example_menu_item_view_get_property (GObject *gobject,
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guint prop_id,
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GValue *value,
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GParamSpec *pspec)
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{
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switch (prop_id)
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{
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case MENU_ITEM_VIEW_PROP_SELECTED:
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g_value_set_boolean (value, EXAMPLE_MENU_ITEM_VIEW (gobject)->is_selected);
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break;
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}
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}
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static void
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example_menu_item_view_class_init (ExampleMenuItemViewClass *klass)
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{
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GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
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gobject_class->set_property = example_menu_item_view_set_property;
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gobject_class->get_property = example_menu_item_view_get_property;
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menu_item_view_props[MENU_ITEM_VIEW_PROP_SELECTED] =
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g_param_spec_boolean ("selected", NULL, NULL,
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FALSE,
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G_PARAM_READWRITE |
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G_PARAM_STATIC_STRINGS);
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g_object_class_install_properties (gobject_class, MENU_ITEM_VIEW_N_PROPS, menu_item_view_props);
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}
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static void
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example_menu_item_view_init (ExampleMenuItemView *self)
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{
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ClutterText *text = CLUTTER_TEXT (self);
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ClutterActor *actor = CLUTTER_ACTOR (self);
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clutter_text_set_font_name (text, "Sans Bold 24px");
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clutter_text_set_color (text, CLUTTER_COLOR_White);
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clutter_actor_set_margin_left (actor, 12);
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clutter_actor_set_margin_right (actor, 12);
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}
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/* }}} */
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/* {{{ Menu */
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/* This is our container actor, which binds the GListStore with the
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* ExampleMenuItemModel instances to the ExampleMenuItemView actors
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*/
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#define EXAMPLE_TYPE_MENU (example_menu_get_type ())
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G_DECLARE_FINAL_TYPE (ExampleMenu, example_menu, EXAMPLE, MENU, ClutterActor)
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struct _ExampleMenu
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{
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ClutterActor parent_instance;
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int current_idx;
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};
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struct _ExampleMenuClass
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{
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ClutterActorClass parent_class;
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};
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G_DEFINE_TYPE (ExampleMenu, example_menu, CLUTTER_TYPE_ACTOR)
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static void
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example_menu_class_init (ExampleMenuClass *klass)
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{
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}
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static void
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example_menu_init (ExampleMenu *self)
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{
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ClutterActor *actor = CLUTTER_ACTOR (self);
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ClutterLayoutManager *layout;
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layout = clutter_box_layout_new ();
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clutter_box_layout_set_orientation (CLUTTER_BOX_LAYOUT (layout), CLUTTER_ORIENTATION_VERTICAL);
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clutter_box_layout_set_spacing (CLUTTER_BOX_LAYOUT (layout), 12);
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clutter_actor_set_layout_manager (actor, layout);
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clutter_actor_set_background_color (actor, CLUTTER_COLOR_Black);
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self->current_idx = -1;
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}
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static ClutterActor *
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example_menu_select_item (ExampleMenu *self,
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int idx)
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{
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ClutterActor *item;
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/* Any change in the view is reflected into the model */
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if (idx == self->current_idx)
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return clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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item = clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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if (item != NULL)
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example_menu_item_view_set_selected ((ExampleMenuItemView *) item, FALSE);
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if (idx < 0)
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idx = clutter_actor_get_n_children (CLUTTER_ACTOR (self)) - 1;
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else if (idx >= clutter_actor_get_n_children (CLUTTER_ACTOR (self)))
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idx = 0;
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self->current_idx = idx;
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item = clutter_actor_get_child_at_index (CLUTTER_ACTOR (self), self->current_idx);
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if (item != NULL)
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example_menu_item_view_set_selected ((ExampleMenuItemView *) item, TRUE);
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return item;
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}
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static ClutterActor *
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example_menu_select_next (ExampleMenu *self)
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{
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return example_menu_select_item (self, self->current_idx + 1);
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}
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static ClutterActor *
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example_menu_select_prev (ExampleMenu *self)
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{
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return example_menu_select_item (self, self->current_idx - 1);
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}
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/* }}} */
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/* {{{ main */
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static gboolean
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on_key_press (ClutterActor *stage,
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@ -348,7 +366,7 @@ static ClutterActor *
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create_menu_item (gpointer item,
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gpointer data G_GNUC_UNUSED)
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{
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ClutterActor *res = g_object_new (EXAMPLE_TYPE_MENU_ITEM, NULL);
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ClutterActor *res = g_object_new (EXAMPLE_TYPE_MENU_ITEM_VIEW, NULL);
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/* The label goes from the model to the view */
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g_object_bind_property (item, "label",
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@ -368,6 +386,7 @@ create_menu_item (gpointer item,
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static ClutterActor *
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create_menu_actor (void)
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{
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/* Our store of menu item models */
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GListStore *model = g_list_store_new (EXAMPLE_TYPE_MENU_ITEM_MODEL);
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ClutterActor *menu = g_object_new (EXAMPLE_TYPE_MENU, NULL);
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int i;
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@ -387,18 +406,27 @@ create_menu_actor (void)
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g_free (label);
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}
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/* Bind the list of menu item models to the menu actor; this will
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* create ClutterActor views of each item in the model, and add them
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* to the menu actor
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*/
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clutter_actor_bind_model (menu, G_LIST_MODEL (model),
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create_menu_item,
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NULL, NULL);
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/* The actor owns the model */
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/* We don't need a pointer to the model any more, so we transfer ownership
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* to the menu actor; this means that the model will go away when the menu
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* actor is destroyed
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*/
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g_object_unref (model);
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/* Select the first item in the menu */
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example_menu_select_item ((ExampleMenu *) menu, 0);
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return menu;
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}
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/* The scrolling container for the menu */
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static ClutterActor *
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create_scroll_actor (void)
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{
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