Qt Signal Slot Event Loop

Today we will learn about a variation of the Observer design patternthat is used prominently within Qt, called signals and slots.

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• Qt Signals And Slots Without Event Loop
• Qt Signal Slot Event Loop 288

• Build complex application behaviours using signals and slots, and override widget event handling with custom events. As already described, every interaction the user has with a Qt application causes an Event. There are multiple types of event, each representing a difference type of interaction — e.g. Mouse or keyboard events.
• An event in Qt is an object which represents something interesting that happened; the main difference between an event and a signal is that events are targeted to a specific object in our application (which decides what to do with that event), while signals are emitted 'in the wild'.

Creates a connection from the timeout signal to slot to be placed in a specific event loop of context, and returns a handle to the connection. This method is provided for convenience. It's equivalent to calling QObject::connect(timer, &QTimer::timeout, context, slot, connectionType).

• Observer and Publish/Subscribe Pattern
• Observers as callback functions
• Observers using signals
• Qt signals
• Examples
• Exercise

GitHub Invitation URL:exercise13

Steps:

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1. Clone the assignment for today after accepting the GitHubinvitation at the link above. The repository contains four files:

• traffic_light.h defines a Qt widget that uses three radio buttons tosimulate a traffic light.
• traffic_light.cpp is the implementation of the traffic light
• main.ccp sets up the application and starts the event loop
• CMakeLists.txt is the build configuration for the example

1. Add code to the TrafficLight class to add a slot called toggle tochange the light currently lit. The sequence should gored->green->yellow->red repeating after that. You will need to addsome internal members to the TrafficLight class to accomplish this.
2. Read the documentation forQTimer and, in the mainfunction of main.cpp, add code to setup and start a timer thatgoes off every one second, resulting in the traffic light beingtoggled. This will require connecting a signal from the timer to theslot implemented in step 2.
3. Build and run your application. Does the light change in the correctsequence?
4. Now, use git to commit the source files changed to the localrepository.
5. Use git push to synchronize the repository with that onGitHub.
6. Finally, post the screenshot of output of your program to Canvas.

Qt Signals And Slots Without Event Loop

1. Add code to the TrafficLight class to add a slot called toggle tochange the light currently lit. The sequence should gored->green->yellow->red repeating after that. You will need to addsome internal members to the TrafficLight class to accomplish this.
2. Read the documentation forQTimer and, in the mainfunction of main.cpp, add code to setup and start a timer thatgoes off every one second, resulting in the traffic light beingtoggled. This will require connecting a signal from the timer to theslot implemented in step 2.
3. Build and run your application. Does the light change in the correctsequence?
4. Now, use git to commit the source files changed to the localrepository.
5. Use git push to synchronize the repository with that onGitHub.
6. Finally, post the screenshot of output of your program to Canvas.

Qt Signals And Slots Without Event Loop

Qt Signal Slot Event Loop 288

You have completed the Exercise.