CS341 Week 05: OOP in Visual Programming

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Questions and Answers

What is the primary role of polymorphism in UI components?

To provide multiple implementations for a base class method. (correct)

To encapsulate data within a class.

To unify the interface of different components.

To extend the functionality of a base class.

Which concept allows for the hiding of complex implementations behind simplified representations in controls?

Encapsulation

Inheritance

Abstraction (correct)

Composition

In event handling for forms, what is the purpose of the OnMouseEnter method in the CustomButton class?

To change the button's background color when the mouse hovers over it. (correct)

To record the time duration of mouse interaction.

To finalize the button's appearance after interaction.

To suppress mouse events for the button.

What is an example of encapsulation in custom controls?

Storing internal state within private fields and exposing it through public properties. Signup and view all the answers

Which of the following best describes the role of inheritance in the CustomButton class?

To provide a base class for creating various button types. Signup and view all the answers

When implementing a blinking label, which OOP concept would likely be the most relevant?

Composition Signup and view all the answers

Which aspect of a watermark functionality is most influenced by abstraction?

The simplification of the watermark's configuration process. Signup and view all the answers

How does composition enhance the modularity of custom controls in C#?

By enabling individual components to be modified independently. Signup and view all the answers

What is the main purpose of the `ValidateInput` method in the `EmailEntryControl` class?

To check if the input contains a valid email address format Signup and view all the answers

How does the `PhoneEntryControl` class validate input?

By parsing it into a long integer Signup and view all the answers

What key principle does `BaseEntryControl` illustrate in its design?

Inheritance and abstraction for common behavior Signup and view all the answers

What event does the `SearchButton` in the `SearchBox` trigger when clicked?

SearchClicked Signup and view all the answers

Which UI component is used to capture the search text in the `SearchBox` class?

TextBox Signup and view all the answers

In the `SearchBox` class, what action does invoking `SearchClicked` perform?

Notifies subscribers about the search request Signup and view all the answers

Which aspect of UI control does ‘composition’ enhance in the `SearchBox` implementation?

Creation of a composite UI element Signup and view all the answers

What would most likely happen if `ValidateInput` in `EmailEntryControl` does not include the check for ' @ '?

More emails would be accepted as valid Signup and view all the answers

What is the primary purpose of the BlinkingLabel class in the provided code?

To simulate blinking behavior using color changes Signup and view all the answers

Which method is responsible for toggling the blink behavior in the BlinkingLabel class?

ToggleBlink Signup and view all the answers

What concept is primarily demonstrated by the BlinkingLabel class when it overrides ForeColor?

Polymorphism Signup and view all the answers

In the context of the BaseEntryControl class, what is the main purpose of the ValidateInput method?

To enforce specific input validation based on derived classes Signup and view all the answers

What does the blinkTimer in the BlinkingLabel class primarily control?

The interval at which the label's color changes Signup and view all the answers

What is the role of the originalColor variable in the BlinkingLabel class?

To restore the label's color after stopping the blink Signup and view all the answers

What advantage does the abstract keyword provide to the BaseEntryControl class?

It indicates that the class cannot be instantiated directly and must be derived Signup and view all the answers

How does the inputTextBox variable serve the BaseEntryControl class?

It allows user input to be captured and managed. Signup and view all the answers

Study Notes

Course Information

Course Title: CS341: Visual Programming
Week: 05
Topic: OOP in Visual Programming
Instructor: Reda M. Hussien
Assistant Professor of Information Systems
Faculty of Computers and Information
Kafr El-Sheikh University

Object-Oriented Programming (OOP) in Visual Programming

OOP in visual programming uses graphical elements (blocks or icons) to represent classes, objects, and OOP concepts
This simplifies programming by allowing direct manipulation of visual representations

OOP Concepts in C# for Custom Controls

Encapsulation: Data fields and methods are nested within blocks
Inheritance: Linking or duplicating class blocks to show relationships
Polymorphism: Overriding methods through editing blocks
Abstraction: Hiding complex implementations behind simplified visual interfaces
Composition: Combines multiple components to create a new one

Custom Controls in C#

Custom controls in C# allow for reusable UI components with encapsulated logic
Using OOP concepts like encapsulation, inheritance, polymorphism, and abstraction, developers can create flexible and modular controls

Encapsulation Example: Custom Button with Hover Effect

The hoverColor field is encapsulated within the CustomButton class and exposed through the HoverColor property
This property manages the hover color behavior within the control

Inheritance Example: Enhanced TextBox with Watermark

Inherits from the TextBox class to add watermark functionality
The WatermarkText property encapsulates the watermark

Polymorphism Example: Blinking Label

The BlinkingLabel overrides the ForeColor property dynamically to simulate blinking behavior

Abstraction Example: Base Entry Control

BaseEntryControl defines common behavior for data entry controls (e.g., validation logic)
The validation logic is abstracted and implemented in derived classes (e.g., EmailEntryControl, PhoneEntryControl)

SearchBox control combines a TextBox and Button to provide a search UI
The behavior is achieved through composition

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Description

This quiz covers Object-Oriented Programming (OOP) concepts in Visual Programming, focusing on how C# utilizes graphical elements for building custom controls. You'll explore encapsulation, inheritance, polymorphism, abstraction, and composition as they relate to visual programming. Test your understanding and apply these key concepts in a practical context.