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bind-constraint: Add width and height binding

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Allow using the BindConstraint to bind width and height of a source
actor.

Also, add a test for the BindConstraint showing all types of usages
for this constraint class.
This commit is contained in:
Emmanuele Bassi
2010-06-28 17:18:35 +01:00
parent b3ffe602a2
commit 32ad63efef
5 changed files with 204 additions and 23 deletions
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105
clutter/clutter-bind-constraint.c
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@ -25,11 +25,56 @@
/**
* SECTION:clutter-bind-constraint
* @Title: ClutterBindConstraint
* @Short_Description: A constraint binding the position of an actor
* @Short_Description: A constraint binding the position or size of an actor
*
* #ClutterBindConstraint is a #ClutterConstraint that binds the position of
* the #ClutterActor to which it is applied to the the position of another
* #ClutterActor.
* #ClutterBindConstraint is a #ClutterConstraint that binds the
* position or the size of the #ClutterActor to which it is applied
* to the the position or the size of another #ClutterActor, or
* "source".
*
* An offset can be applied to the constraint, to avoid overlapping. The offset
* can also be animated. For instance, the following code will set up three
* actors to be bound to the same origin:
*
* |[
* /* source */
* rect[0] = clutter_rectangle_new_with_color (&red_color);
* clutter_actor_set_position (rect[0], x_pos, y_pos);
* clutter_actor_set_size (rect[0], 100, 100);
*
* /* second rectangle */
* rect[1] = clutter_rectangle_new_with_color (&green_color);
* clutter_actor_set_size (rect[1], 100, 100);
* clutter_actor_set_opacity (rect[1], 0);
*
* constraint = clutter_bind_constraint_new (rect[0], CLUTTER_BIND_X, 0.0);
* clutter_actor_add_constraint_with_name (rect[1], "green-x", constraint);
* constraint = clutter_bind_constraint_new (rect[0], CLUTTER_BIND_Y, 0.0);
* clutter_actor_add_constraint_with_name (rect[1], "green-y", constraint);
*
* /* third rectangle */
* rect[2] = clutter_rectangle_new_with_color (&blue_color);
* clutter_actor_set_size (rect[2], 100, 100);
* clutter_actor_set_opacity (rect[2], 0);
*
* constraint = clutter_bind_constraint_new (rect[0], CLUTTER_BIND_X, 0.0);
* clutter_actor_add_constraint_with_name (rect[2], "blue-x", constraint);
* constraint = clutter_bind_constraint_new (rect[0], CLUTTER_BIND_Y, 0.0);
* ]|
*
* The following code animates the second and third rectangles to "expand"
* them horizontally from underneath the first rectangle:
*
* |[
* clutter_actor_animate (rect[1], CLUTTER_EASE_OUT_CUBIC, 250,
* "@constraints.green-x.offset", 100.0,
* "opacity", 255,
* NULL);
* clutter_actor_animate (rect[2], CLUTTER_EASE_OUT_CUBIC, 250,
* "@constraints.blue-x.offset", 200.0,
* "opacity", 255,
* NULL);
* ]|
*
* #ClutterBindConstraint is available since Clutter 1.4
*/
@ -79,8 +124,9 @@ G_DEFINE_TYPE (ClutterBindConstraint,
CLUTTER_TYPE_CONSTRAINT);
static void
update_actor_position (ClutterBindConstraint *bind)
update_actor_coords (ClutterBindConstraint *bind)
{
gfloat source_width, source_height;
ClutterVertex source_position;
ClutterActor *actor;
@ -97,6 +143,7 @@ update_actor_position (ClutterBindConstraint *bind)
source_position.x = clutter_actor_get_x (bind->source);
source_position.y = clutter_actor_get_y (bind->source);
source_position.z = clutter_actor_get_depth (bind->source);
clutter_actor_get_size (bind->source, &source_width, &source_height);
switch (bind->coordinate)
{
@ -111,20 +158,32 @@ update_actor_position (ClutterBindConstraint *bind)
case CLUTTER_BIND_Z:
clutter_actor_set_depth (actor, source_position.z + bind->offset);
break;
case CLUTTER_BIND_WIDTH:
clutter_actor_set_width (actor, source_width + bind->offset);
break;
case CLUTTER_BIND_HEIGHT:
clutter_actor_set_height (actor, source_height + bind->offset);
break;
}
}
static void
source_position_changed (GObject *gobject,
GParamSpec *pspec,
ClutterBindConstraint *bind)
source_allocation_changed (ClutterActor *source,
const ClutterActorBox *allocation,
ClutterAllocationFlags flags,
ClutterBindConstraint *bind)
{
if (strcmp (pspec->name, "x") == 0 ||
strcmp (pspec->name, "y") == 0 ||
strcmp (pspec->name, "depth") == 0)
{
update_actor_position (bind);
}
update_actor_coords (bind);
}
static void
source_depth_changed (GObject *gobject,
GParamSpec *pspec,
ClutterBindConstraint *bind)
{
update_actor_coords (bind);
}
static void
@ -308,21 +367,27 @@ clutter_bind_constraint_set_source (ClutterBindConstraint *constraint,
G_CALLBACK (source_destroyed),
constraint);
g_signal_handlers_disconnect_by_func (old_source,
G_CALLBACK (source_position_changed),
G_CALLBACK (source_allocation_changed),
constraint);
g_signal_handlers_disconnect_by_func (old_source,
G_CALLBACK (source_depth_changed),
constraint);
}
constraint->source = source;
if (constraint->source != NULL)
{
g_signal_connect (constraint->source, "notify",
G_CALLBACK (source_position_changed),
g_signal_connect (constraint->source, "allocation-changed",
G_CALLBACK (source_allocation_changed),
constraint);
g_signal_connect (constraint->source, "notify::depth",
G_CALLBACK (source_depth_changed),
constraint);
g_signal_connect (constraint->source, "destroy",
G_CALLBACK (source_destroyed),
constraint);
update_actor_position (constraint);
update_actor_coords (constraint);
}
g_object_notify (G_OBJECT (constraint), "source");
@ -366,7 +431,7 @@ clutter_bind_constraint_set_coordinate (ClutterBindConstraint *constraint,
constraint->coordinate = coordinate;
update_actor_position (constraint);
update_actor_coords (constraint);
g_object_notify (G_OBJECT (constraint), "coordinate");
}
@ -410,7 +475,7 @@ clutter_bind_constraint_set_offset (ClutterBindConstraint *constraint,
constraint->offset = offset;
update_actor_position (constraint);
update_actor_coords (constraint);
g_object_notify (G_OBJECT (constraint), "offset");
}