state-machine

I have two widgets that can be checked, and a numeric entry field that should contain a value greater than zero. Whenever both widgets have been checked, and the numeric entry field contains a value greater than zero, a button should be enabled. I am struggling with defining a proper state machine for this situation. So far I have the following: QStateMachine *machine = new QStateMachine(this); QState *buttonDisabled = new QState(QState::ParallelStates); buttonDisabled->assignProperty(ui_->button, "enabled", false); QState *a = new QState(buttonDisabled); QState *aUnchecked = new QState(a);

Is it possible to send variables in the the transition? i.e. @car.crash!(:crashed_by => current_user) I have callbacks in my model but I need to send them the user who instigated the transition after_crash do |car, transition| # Log the car crashers name end I can't access current_user because I'm in the Model and not the Controller/View. And before you say it... I know I know. Don't try to access session variables in the model I get it. However, whenever you wish to create a callback that logs or audits something then it's quite likely you're going to want to know who caused it? Ordinarily I

I'd love to figure it out myself but I was wondering roughly what's the algorithm for converting a function with yield statements into a state machine for an enumerator? For example how does C# turn this: IEnumerator<string> strings(IEnumerable<string> args) { IEnumerator<string> enumerator2 = getAnotherEnumerator(); foreach(var arg in arg) { enumerator2.MoveNext(); yield return arg+enumerator.Current; } } into this: bool MoveNext() { switch (this.state) { case 0: this.state = -1; this.enumerator2 = getAnotherEnumerator(); this.argsEnumerator = this.args.GetEnumerator(); this.state = 1; while

I am currently learning java and would like to know how to control state in a OO way. I implemented a Pong app. If I wanted multiple states like gameplay and menu, and each one of these states had to execute start, stop and run how would I achieve this and how would I switch between these states. I know I could simply throw in a big switch statement but what's the best way to implement this? I want to be able to switch to the menu state in the gameplay state and vice versa. import java.applet.*; import java.awt.*; import java.awt.event.*; public class Pong extends Applet implements Runnable,

We have a system at my work that is basically a message-driven state machine. It takes in a variety of types of messages, looks up some context/state based on the message, then decides what to do, based on the message and the current state. Normally the result is a message being sent out of the system. Are there any good open-source frameworks for implementing a state machine in .NET? I've looked into the latest release of Windows Workflow, and it seems like it would be a good option; however, I have some concerns about the default persistence mechanisms (we need to report off the state

I am trying to wrap my mind around the best way to implement nested state transitions in a single threaded programming language (Actionscript). Say I have a structure like this behavior tree: Now imagine that each leaf node is a destination point on a website, like an image in a gallery, or a comment nested in a post view nested in a page view... And the goal is to be able to run animated transitions from leaf node to leaf node, by animating out the previous tree (from bottom to top), and animating in the current tree (from top to bottom). So, if we were at the bottom-left-most leaf node, and