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Event driven programming is commonly used for GUI applications where events like button clicks or text changes trigger event handler functions. Key aspects include event handlers that contain code to execute in response to events, trigger functions that determine which handler to run, and event loops that constantly check for events. This approach provides flexibility by allowing programmers to control where code runs and what specific user actions it will respond to.
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Ch 3 event driven programming
The document discusses event-driven programming and how it relates to graphical user interfaces and the Alice programming language. Event-driven programming involves event listeners detecting event triggers and responding by running event handler methods. In Alice, programmers can select different event types from a menu and specify event handlers by dragging method tiles. Events are important for creating interactive worlds and are widely used in modern programming languages.
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Object-oriented analysis and design (OOAD) is a popular approach for analyzing, designing, and developing applications using the object-oriented paradigm. It involves modeling a system as a group of interacting objects at various levels of abstraction. Key concepts in OOAD include objects, classes, attributes, methods, encapsulation, inheritance, polymorphism, and relationships like association, aggregation, and composition. Common OOAD techniques include use case diagrams, which show interactions between actors and the system, and class diagrams, which describe the structure and behavior of system objects and their relationships.
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This document defines and explains the key elements of a sequence diagram:
- Sequence diagrams show the interactions between objects through messages over time.
- Objects are represented by vertical lifelines and may send/receive synchronous, asynchronous, reflexive, return, create, and destroy messages.
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Abstract:
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Also
http://federico.galassi.net/
http://www.webtechcon.it
Follow me on Twitter!
https://twitter.com/federicogalassi
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C# supports event-driven programming like in Windows applications. Events are generated by event producers and consumed by event subscribers. The key components of the C# event model are delegates, which define the signature of event handler methods, event generating objects that maintain subscriber lists and raise events, and event handling objects that subscribe to events and contain handler methods. The document provides examples of how to create each type of component to implement custom event processing in C# programs.
Unit 6 Java
The document discusses object oriented programming concepts like events, event sources, event classes, event listeners, and the delegation event model. It describes how events like mouse clicks and keyboard presses are handled in Java. It provides details on common event classes like MouseEvent and KeyEvent. It also discusses components of the AWT class hierarchy like labels, buttons, text fields, and scrollbars, and how to handle user interface events with them.
JAVA PROGRAMMING- GUI Programming with Swing - The Swing Buttons
JAVA PROGRAMMING- GUI Programming with Swing - The Swing ButtonsJyothishmathi Institute of Technology and Science Karimnagar
GUI Programming with Swing – Introduction, limitations of AWT, MVC architecture, components, containers. Understanding Layout Managers, Flow Layout, Border Layout, Grid Layout, Card Layout, Grid Bag Layout.
Event Handling- The Delegation event model- Events, Event sources, Event Listeners, Event classes, Handling mouse and keyboard events, Adapter classes, Inner classes, Anonymous Inner classes.
A Simple Swing Application, Applets – Applets and HTML, Security Issues, Applets and Applications, passing parameters to applets. Creating a Swing Applet, Painting in Swing, A Paint example, Exploring Swing Controls- JLabel and Image Icon, JText Field,
The Swing Buttons-JButton, JToggle Button, JCheck Box, JRadio Button, JTabbed Pane, JScroll Pane, JList, JCombo Box, Swing Menus, Dialogs.
Event Handling in JAVA
This document provides an overview of event handling in Java. It discusses key concepts like events, event sources, event listeners, and different types of events like action events, item events, key events, mouse events, and window events. For each event type, it describes the relevant listener interface and event class, including their common methods. It explains how events are generated by sources and handled by registered listener objects using the delegation event model in Java.
Advance Java Programming(CM5I) Event handling
The document discusses event handling in Java. It defines key terms like events, event sources, and event listeners. Events describe changes in state of objects, like user interactions. Event sources generate events, while event listeners receive notifications of events. The delegation event model is described where sources generate events that are sent to registered listeners. Important event classes like ActionEvent and listener interfaces are listed. The steps to handle events, which include implementing listener interfaces and registering components with listeners, are outlined.
Event handling
The document discusses Java event handling and the delegation event model. It describes key concepts like events, sources that generate events, and listeners that handle events. It provides examples of registering components as listeners and implementing listener interfaces. The delegation event model joins sources, listeners, and events by notifying listeners when sources generate events.
Proposed Event Processing Definitions ,September 20, 2006
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Lesson 07 Actions and Commands in WPF
Routed events allow events to invoke handlers on multiple listeners in an element tree. Routed events are backed by the RoutedEvent class and processed by the WPF event system. Events can route from element to root (bubbling), only at the source element (direct), or from root to element (tunneling). Attached events allow handlers to be attached to child elements. Event triggers and setters in styles allow sharing handlers across multiple elements. Commands specify actions and use a command source to invoke a command target through a command binding. Custom commands implement the ICommand interface. Triggers in styles, templates, and templates apply setters or animations when property values or events change.
Ajp notes-chapter-03
This document provides an overview of event handling in Java. It discusses the delegation event model where a source generates an event and sends it to one or more listeners. It describes event sources, event listeners, common event classes like ActionEvent, MouseEvent, and KeyEvent. It explains the roles of sources that generate events, listeners that receive event notifications, and event classes that represent specific types of events.
tL20 event handling
The document discusses Java event handling and various listener interfaces. It describes the delegation event model where an event source generates an event and sends it to registered listeners. It outlines common listener interfaces like ActionListener, ItemListener, KeyListener, MouseListener, and WindowListener. It provides details on the methods in each interface and how to write classes that implement the listener interfaces.
event-handling.pptx
The document discusses event handling in Java. It describes how events are generated from user interactions with GUI components and handled via the delegation event model. This model involves events, event sources that generate events, and event listeners that receive and process events. The document lists some important event classes like ActionEvent and MouseEvent, and listener interfaces. It also provides details on how to register listeners with sources and implement event handling in classes.
Events1
Event handling in Java uses the delegation event model. There are two main types of events - foreground events which require direct user interaction, and background events which do not. The delegation model defines key participants in event handling - the source which generates the event, and the listener which processes the event. Common event classes in Java include ActionEvent, WindowEvent, AdjustmentEvent, and KeyEvent. Listener interfaces define callback methods for the different event types.
Javascript Browser Events.pdf
An event is an action that occurs within a web page, such as user interactions like clicks or keyboard presses. JavaScript uses event handlers and listeners to respond to events. There are three main ways to attach event handlers: inline, DOM properties, and addEventListener(). The event object provides information about the event, like the element it occurred on. Events follow the DOM event flow of capturing and bubbling. Multiple listeners can be added for an event. Event delegation improves efficiency by listening for events on a parent rather than individual children.
event_handling.ppt
This document discusses event handling in Java. It explains that any GUI environment monitors events from inputs like mouse clicks and keyboard presses, and reports these events to running programs. Java takes an approach between Visual Basic and C++ by allowing programs to register event listeners to respond to specific events from sources like buttons. When an event occurs, the source sends a notification to all registered listeners of that event type using an event object.
Chap - 2 - Event Handling.pptx
This document discusses event handling in Java. It defines events as changes in the state of an object and categorizes them as foreground or background events. It explains that event handling uses a delegation model with sources that generate events and listeners that handle them. It provides an example of handling action events from buttons by implementing an ActionListener interface and attaching it to the buttons. The example displays text indicating which button was clicked.
Dr Jammi Ashok - Introduction to Java Material (OOPs)
Event handling is a fundamental part of Java programming that allows programs to respond to user interactions. There are three main components to Java's event model: events, event sources, and event listeners. Events are objects that describe state changes in sources like user interface elements. Sources generate events when their internal state changes, like a button being clicked. Listeners must register with sources to receive notifications about specific event types and contain methods to process those events.
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Event+driven+programming key+features
- 1. Event Driven Programming Key Features
- 2. Event Driven Programs Typically used for most modern day software applications examples include: word processing, spreadsheets, drawing packages etc. Usually used for GUIs where many types of events are generated i.e. clicking on a button or another object
- 3. Key features Event Handlers Trigger Functions Events Event Loops Forms Flexibility Service oriented Suitability for GUIs Simplicity of programming Time Driven
- 4. Event Handlers VB.Net uses subroutines for event handling, with the name of the object followed by the name of the event – see below: Event Event Handler
- 5. ByVal means it is passing the variable by value. sender is an object of type System.Object. All objects in .NET inheirit from System.Object, as such it is passing the control that is causing the event to fire. e is an object of type System.EventArgs where EventArgs is the Class for event arguments or, the arguments the event is passed. It contains information you need to process the event. The information available depends on the type of event that was raised. Since the members available through the "e" argument depend on the kind of action that raised the event, it is important to use an event that provides the information you're interested in.
- 7. Trigger functions These are used along with the object’s name to determine with event handler to run Every object has a range of trigger functions, one for each possible event that can happen to it. For example, txtText could have an event handler for the following triggers: GotFocus, TextChanged etc... Temporal triggers mean triggers set off by duration of time State triggers are when the current situation causes a certain set of procedures to run What is the trigger here??
- 8. Event Loops Event Driven Programs have event loops built into the environment. The loops keep testing the interface to detect whether anything has happened, such as clicking on a button or typing into a textbox etc. Event Loops are also known as event listeners
- 9. Flexibility Programmers have erroneous control over where to place code and how to start it. Every object has a good choice of events that a program can respond to. These events give an excellent level of control over exactly what the program will respond to when the user does something