GUI Components

JMU

GUI Components
An Introduction

Prof. David Bernstein
James Madison University

Computer Science Department

bernstdh@jmu.edu

What is a GUI Component?

To a User:
- A View (in the M-V-C)
To a Developer:
- A Model
- A Controller

Abstract Components

Model:
- N/A
View:
- Colors, fonts, ...
Controller:
- hasFocus, isEnabled, ...

Buttons

Model:
- Labels, icons
View:
Controller:
- MouseDown, MouseUp
- MouseOver, MouseOut, KeyPressed

Checkboxes/Radiobuttons

Model:
- Labels, icons, isSelected
View:
Controller:
- MouseClick

Listboxes/Comboboxes

Model:
- Alternatives, selectedItems
View:
Controller:
- MouseClick, KeyPressed

Sliders

Model:
- lowerBound, upperBound, value
View:
Controller:
- MouseDrag

Scrollbars

Model:
- Same as for sliders
View:
Controller:
- MouseDrag, MouseClick

Textfields/TextAreas

Model:
- See the discussion of the M-V-C
View:
- See the discussion of the M-V-C
Controller:
- See the discussion of the M-V-C