 | This article may be confusing or unclear to readers.(May 2017) |
The Binding properties pattern is combining multiple observers to force properties in different objects to be synchronized or coordinated in some way. This pattern was first described as a technique by Victor Porton. [1] [2] This pattern comes under concurrency patterns.
As an alternative to the aspect-oriented implementation of mutual properties, property binding can be proposed. In LibPropC++ C++ library it is implemented too. [3]
Some weakness in the LibPropC++ (with property binding):
There are two types of binding. One-way binding should be applied when one of the properties is read-only. In other cases, two-way binding must be applied. [2] [3]
Infinite loops can be eliminated by blocking the signal, or comparing the assigned value with the property value before assignment, or eliminating unnecessary assignments. [2] [3]
Binding properties of different types can be achieved through type conversions. [2] [3]
Binding properties with transformations can be achieved through reducing the transformation function to the problem of binding properties, and the function can be imaginary consider as Type Conversions. [2] [3]
Properties are being kept synchronized automatically. Between library calls they always have the values expressed by the EqualityConstraints. [3]
Property changes watching mechanism acquires some resources. [3]
Code sketch for one-way binding may look like as follows:
bind_multiple_one_way(src_obj,src_prop,dst_objs[],dst_props[]){for(i,j)in(dst_objs,dst_props){bind_properties_one_way(src_obj,src_prop,i,j);}}Two-way binding can be expressed as follows (in C++):
// In this pseudo-code are not taken into the account initial values assignmentsbind_two_way(prop1,prop2){bind(prop1,prop2);bind(prop2,prop1);}Accomplishing the binding (i.e. connecting the property change notification in an event handler) may be like as follows:
on_property_change(src_prop,dst_prop){block_signal(src_obj,on_property_change);dst_prop:=src_prop;unblock_signal(src_obj,on_property_change);}
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