A node for changing style properties (like color) for its
descendants. It stores a set of properties. There is no automatic change
propagation after a change of the property values, so the programmer can change
many properties and then call vcl_property_changed() to process
all changes at once.
It supports the object interface, the node interface, the container interface and the enclosure interface.
struct vcl_property * vcl_property_new (void)
Creates a property node with an empty set of properties.
void vcl_property_set (struct vcl_property * obj, int prop_id,
void *prop_data)
Sets the property with ID prop_id to value prop_data.
int vcl_property_get_count (struct vcl_property * obj)
Returns the size of the set of properties in obj.
int vcl_property_get_nth_type (struct vcl_property * obj, int n)
Returns the ID of the n-th property.
void * vcl_property_get_nth_value (struct vcl_property * obj, int n)
Returns the value of the n-th property.
void * vcl_property_get (struct vcl_property * obj, int prop_id)
Returns the value of the property with ID prop_id.
void vcl_property_changed (struct vcl_property * obj)
Causes the change propagation (and a drawing update).
Shortcuts to set common properties
VCL_PROP_FILL_COLOR void vcl_property_set_fill_color (void *prop, u32 color)
VCL_PROP_STROKE_COLOR void vcl_property_set_stroke_color (void *prop, u32 color)
VCL_PROP_STROKE_WIDTH void vcl_property_set_stroke_width (struct vcl_property * obj, double width)
VCL_PROP_STROKE_CAP_STYLE void vcl_property_set_stroke_cap_style (void *prop, uns cap_style)
VCL_PROP_STROKE_JOIN_STYLE void vcl_property_set_stroke_join_style (void *prop, uns join_style)