12/24/2023 0 Comments Qt slot machine program![]() ![]() States can be nested inside of other states, and the current configuration of the state machine consists of the set of states which are currently active. The state graph in the State Machine framework is hierarchical. Qt's event system is used to drive the state machines. The framework integrates tightly with Qt's meta-object system for example, transitions between states can be triggered by signals, and states can be configured to set properties and invoke methods on QObjects. The State Machine framework provides an API and execution model that can be used to effectively embed the elements and semantics of statecharts in Qt applications. With statecharts, this information is easy to express. A key characteristic of event-driven systems (such as Qt applications) is that behavior often depends not only on the last or current event, but also the events that preceded it. This is done by defining the possible states that the system can be in, and how the system can move from one state to another ( transitions between states). Statecharts provide a graphical way of modeling how a system reacts to stimuli. The semantics of state machine execution are based on State Chart XML (SCXML). The concepts and notation are based on those from Harel's Statecharts, which is also the basis of UML state diagrams. The State Machine framework provides classes for creating and executing state graphs.
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