Design Pattern

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Design Pattern

Command

user interface toolkits

support undo operations

parameterize requests

Composite

Chain of responsibility

used in our project

implementation

representing requests

request objects

qt's event system

a single handler function

hard-coded operation invocation

connecting successors

implementing the successor chain

define new links

use existing links

consequences

liabilities

unhandled maybe

benefits

flexibility in assigning responsibilities

Reduce coupling

collaborations

participants

Client

ConcreteHandler

Handler

structure

applicability

request automatical ascertain

handler specified dymatically

request to one

multi handlers

motivation

help facility

Intent

decouple requests

receiver

sender