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?

<p>Storing internal state within private fields and exposing it through public properties. (D)</p> Signup and view all the answers

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

<p>To provide a base class for creating various button types. (B)</p> Signup and view all the answers

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

<p>Composition (B)</p> Signup and view all the answers

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

<p>The simplification of the watermark's configuration process. (D)</p> Signup and view all the answers

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

<p>By enabling individual components to be modified independently. (C)</p> Signup and view all the answers

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

<p>To check if the input contains a valid email address format (D)</p> Signup and view all the answers

How does the PhoneEntryControl class validate input?

<p>By parsing it into a long integer (A)</p> Signup and view all the answers

What key principle does BaseEntryControl illustrate in its design?

<p>Inheritance and abstraction for common behavior (B)</p> Signup and view all the answers

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

<p>SearchClicked (A)</p> Signup and view all the answers

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

<p>TextBox (A)</p> Signup and view all the answers

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

<p>Notifies subscribers about the search request (A)</p> Signup and view all the answers

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

<p>Creation of a composite UI element (C)</p> Signup and view all the answers

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

<p>More emails would be accepted as valid (D)</p> Signup and view all the answers

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

<p>To simulate blinking behavior using color changes (D)</p> Signup and view all the answers

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

<p>ToggleBlink (A)</p> Signup and view all the answers

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

<p>Polymorphism (B)</p> Signup and view all the answers

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

<p>To enforce specific input validation based on derived classes (B)</p> Signup and view all the answers

What does the blinkTimer in the BlinkingLabel class primarily control?

<p>The interval at which the label's color changes (B)</p> Signup and view all the answers

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

<p>To restore the label's color after stopping the blink (B)</p> Signup and view all the answers

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

<p>It indicates that the class cannot be instantiated directly and must be derived (D)</p> Signup and view all the answers

How does the inputTextBox variable serve the BaseEntryControl class?

<p>It allows user input to be captured and managed. (D)</p> Signup and view all the answers

Flashcards

BaseEntryControl

A base class for data entry controls that handles validation logic.

ValidateInput()

A method that checks if the input data is valid.

EmailEntryControl

A derived class of BaseEntryControl that validates email addresses.

PhoneEntryControl

A derived class of BaseEntryControl that validates phone numbers.

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long.TryParse()

A method that attempts to parse text as a 64-bit integer.

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SearchBox

A custom control that combines a TextBox and a Button for searching.

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Composition

Combining existing controls to create a new control.

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UserControl

A class representing a reusable UI component.

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BlinkingLabel class

A class in C# to create a label that blinks.

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Timer component

A component in .NET used to schedule actions at specified intervals.

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IsBlinking property

Controls the blinking state of the label. True: blinks, False: doesn't blink.

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ForeColor property

Sets the text color of a control. Example: a label's text color.

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ToggleBlink() method

Changes the label's color to red or back to the original color.

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BaseEntryControl

Abstract class in Visual Programming, provides a template for Input controls.

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Value Property

Informs and sets the data content of the Text Box.

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ValidateInput() method

Checks if input in a control is valid according to specific rules.

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OOP in Visual Programming

Using visual elements to represent and manipulate OOP concepts like classes, objects, encapsulation, inheritance, etc.

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Encapsulation

Bundling data and methods that operate on that data within objects. This isolates details from the outside world.

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Inheritance

Creating new classes (child classes) that inherit properties and methods from existing classes (parent classes).

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Polymorphism

The ability of an object to take on many forms. This allows the same procedure to be used with objects of different classes.

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Abstraction

The simplified representation of an object by showing only essential data/methods, hiding details.

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Custom Controls (C#)

Reusable UI components with their own logic, coded in C#.

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Hover Effect

A visual change in a component (e.g., a button) when the mouse hovers over it.

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Composition

Combining existing controls to build a new control.

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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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Related Documents

CS341 Visual Programming Lecture 05 PDF

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.

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