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Class distans.TwoAltPanels

java.lang.Object
   |
   +----java.awt.Component
           |
           +----java.awt.Container
                   |
                   +----java.awt.Panel
                           |
                           +----distans.TwoAltPanels

public class TwoAltPanels
extends Panel
implements ShowPanelInterface

This class displays QuestionPAges of type ALT. Because all subquestions can't be showned at the same screen A card system is used for displaying two at a time. This class also take care of taking the information from the text fields and putting it into the data structures.

ad: A refernece to a student answer object, this is only used by the ReadAnswer Applet
ap: An array with the AltPanels.
cardNo: The number of the current card beeing displayed, 0-
noOfPanels: The number of AltPanels on each card, even though the name of this class says two more than two could be possible.
pd: A reference to the page currently beeing displayed, the PageData must be of type ALT

TwoAltPanels(): Constructor adds the two AltPanels using a flowLayout

addNotify()
initRead(): Sets the AltPanels to not editabel, used when working with ReadAnswerApplet
putPage(PageData): Call this method to display the first card of a new page.
putPage(PageData, AnswerData)
saveCurrentCard(): Saves the information of the current card in PageData
show(): Not used just calls the super class (Panel)
showCurrentCard(): Shows the current card by changing the text in the two AltPanels.
showNextCard(): Saves the information of the old card in the data structures and displays the next card.
showPrevCard(): Saves the information of the old card in the data structures and displays the previous card.
validateAndHide(): Calls validateCard and hides the Panel
validateCard(): Saves the current card by calling saveCurrentCard()

noOfPanels

 static final int noOfPanels

The number of AltPanels on each card, even though the name of this class says two more than two could be possible.

 private AltPanel ap[]

An array with the AltPanels.

 private PageData pd

A reference to the page currently beeing displayed, the PageData must be of type ALT

 private AnswerData ad

A refernece to a student answer object, this is only used by the ReadAnswer Applet

cardNo

 private int cardNo

The number of the current card beeing displayed, 0-

TwoAltPanels

 public TwoAltPanels()

Constructor adds the two AltPanels using a flowLayout

putPage

 public void putPage(PageData pd,
                     AnswerData ad)

putPage

 public void putPage(PageData pd)

Call this method to display the first card of a new page. The old page current card is saved with a call to vaildateCard.

show

 public void show()

Not used just calls the super class (Panel)

Overrides:: show in class Component

validateCard

 public void validateCard()

Saves the current card by calling saveCurrentCard()

showCurrentCard

 private void showCurrentCard()

Shows the current card by changing the text in the two AltPanels. The text displayed depends if it should display text for editing/creating pages or the students answers.

showNextCard

 public void showNextCard()

Saves the information of the old card in the data structures and displays the next card.

saveCurrentCard

 private boolean saveCurrentCard()

Saves the information of the current card in PageData

Returns:: false if not all the text fields in the two AltPanels are filled, true otherwise

showPrevCard

 public void showPrevCard()

Saves the information of the old card in the data structures and displays the previous card.

validateAndHide

 public void validateAndHide()

Calls validateCard and hides the Panel

See Also:: validateCard

initRead

 public void initRead()

Sets the AltPanels to not editabel, used when working with ReadAnswerApplet

addNotify

 public void addNotify()

Overrides:: addNotify in class Panel

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