Design for ButtonApp4 Program

Main:

• Instance Variables: none

• Methods: none

• Responsibilities:

  • Set up the main window
  • Create main objects we need: Canvas, Model, 2 control panels
  • Lay out the main window (canvas, 2 control panels)

Canvas

• Instance Variables:

  • Pointer to Model

• Methods:

  • paintComponent() callback, overridden from JComponent
  • MouseListener callbacks, overriden from MouseListener
  • (setModel(), to avoid forward reference)

• Responsibilities:

  • Catch paintComponent() callback and delegate to Model
  • Catch mousePressed() callback and delegate to Model

• Uses:

  • Model: which does the redraw by calling Square
  • Model: which does the input by calling Square

Model:

• Instance Variables:

  • Application data: List of squares, boolean drawX
  • [and setX()]
  • Current square
  • [and getCurrent()]
  • Pointer to Canvas

• Methods:

  • drawModel()
  • doMouse()

• Responsibilities:

  • Keep list of Squares
  • Handle functions that iterate over list (drawModel, doMouse)
  • Remember current square (perhaps belongs in UI instead)
  • Maintain and handle drawX option

• Uses:

  • Canvas: to redraw after change drawX
  • Square: to redraw themselves
  • Square: to input themselves

Square (is a part of the "model" data)

• Instance Variables:

  • Pointer to Canvas
  • Info about the square: x, y, w, h

• Methods:

  • draw()
  • doAction()
  • boolean isInside()

• Responsibilities:

  • Initialize and maintain "application data"
  • Draw yourself (given g and isCurrent)
  • Know how to move left/right/bigger/smaller
  • Answer question is Point inside you?
  • Initialize to unique starting position

• Uses:

  • Canvas: for redrawing everything after move

ControlGlobal:

• (Inherited from ControlPanel)

  • Pointer to model

• Methods:

  • constructor()

• Responsibilities:

  • Set up JPanel
  • Create button

• Uses:

  • Model: just to pass to ButtonXXX constructors

ControlSingle:

• (Inherited from ControlPanel)

  • Pointer to model

• Methods:

  • constructor()

• Responsibilities:

  • Set up JPanel
  • Create buttons

• Uses:

  • Model: just to pass to Button* constructors

ButtonLeft, Right, Bigger, Smaller

• (Inherited from Button)

  • Pointer to model

• Methods:

  • actionPerformed() callback

• Responsibilities:

  • Set up the JButton
  • Provide the callback

• Uses:

  • Model: for getCurrent
  • Square: for action on getCurrent

ButtonX

• (Inherited from Button)

  • Pointer to model

• Instance Variables:

  • boolean buttonState

• Methods:

  • actionPerformed() callback

• Responsibilities:

  • Set up the JButton
  • Provide the callback
  • Remember current state of toggle

• Uses:

  • Model: to execute setX

Aggregation Hierarchy

Main

• Canvas

• Model

  • Square(s)

• ControlGlobal

  • ButtonX

• ControlSingle

  • ButtonBigger
  • ButtonLeft
  • ButtonRight
  • ButtonSmaller

Class Hierarchy

Main

Canvas

Model

Square

ControlPanel

• ControlGlobal
• ControlSingle

Button

• ArrowButton

  • ButtonLeft
  • ButtonRight

• TextButton

  • ButtonBigger
  • ButtonSmaller
  • ButtonX