vgp.tutor.updatePanel

## Class MyClass_IP

- java.lang.Object
- - java.awt.Component
  - - java.awt.Container
    - - java.awt.Panel
      - - jv.object.PsPanel
        - - vgp.tutor.updatePanel.MyClass_IP

- All Implemented Interfaces:
    java.awt.event.ActionListener, java.awt.event.ItemListener, java.awt.event.TextListener, java.awt.image.ImageObserver, java.awt.MenuContainer, java.io.Serializable, java.util.EventListener, javax.accessibility.Accessible, PsUpdateIf

      public class MyClass_IP
      extends PsPanel
      implements java.awt.event.ActionListener, java.awt.event.ItemListener, java.awt.event.TextListener

  Tutorial info panel for combined use of Java1.1 Events and JavaView Update Mechanism. In the Java 1.1 event mechanism each widget may have registered listeners which are informed whenever the state of a widget chances. Java distinguishes between different types of events such as ActionEvent or ItemEvent, and listeners may register for a single or multiple events. Each listener must implement an interface corresponding to a specific event. This tutorial panel is both, an ActionListener and an ItemListener, and is able to register itself in widgets. The JavaView update mechnism forces panels to have a single parent. The parent registers itself using the method 'setParent' of the panel. Whenever the panel changes and its methods 'actionPerformed()' or 'itemStateChanged()' are called, it modifies the instance variables of the parent directly but must invoke the update method of its parent such that the parent initiate further recomputations of itself and its dependents. The strong coupling of a panel and its parent also allows the parent to inform the panel whenever the parent has changed. This is accomplished through the update method of the panel. This method should only be called from the parent and its superclasses and, usually, not from inside the panel.
  See Also:
    `PsObject`, `PsUpdateIf`, Serialized Form

- - ### Nested Class Summary

    - ### Nested classes/interfaces inherited from class java.awt.Component

      `java.awt.Component.BaselineResizeBehavior`

  - ### Field Summary

    - ### Fields inherited from class jv.object.PsPanel

      `BORDER_GROOVE, BORDER_LINE, BORDER_LINETOP, BORDER_NONE, BORDER_SUNK, BOUNDARY, BOUNDARY_EXT, CONFIG, CONFIG_EXT, INFO, INFO_EXT, LABEL, LABEL_EXT, MATERIAL, MATERIAL_EXT, ORIENT_GUIDE, ORIENT_HORIZONTAL, ORIENT_VERTICAL, TEXTURE, TEXTURE_EXT, VECTOR, VECTOR_EXT`

    - ### Fields inherited from class java.awt.Component

      `BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT`

    - ### Fields inherited from interface java.awt.image.ImageObserver

      `ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH`

  - ### Constructor Summary

    Constructors
    Constructor and Description
    `MyClass_IP()` Create and layout the widgets of the panel.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `actionPerformed(java.awt.event.ActionEvent event)` Handle action events invoked from buttons, menu items, text fields.
    `void` | `init()` Set values of variables.
    `void` | `itemStateChanged(java.awt.event.ItemEvent event)` Handle item state events invoked from choices, checkboxes, list items.
    `void` | `setParent(PsUpdateIf parent)` Set parent of panel which supplies the data inspected by the panel.
    `void` | `textValueChanged(java.awt.event.TextEvent event)` Handle any chances in text field.
    `boolean` | `update(java.lang.Object event)` Update the panel whenever the parent has changed somewhere else.

    - ### Methods inherited from class jv.object.PsPanel

      `addLabelComponent, addLine, addLine, addSubTitle, addTextField, addTitle, drawBorder, drawBorder, drawBorder, drawBorder, drawText, getFather, getInsets, getLanguage, getPanelVersion, getPreferredSize, getTitle, getTitle, getTitle, hasTitle, instanceOf, paint, removeTitle, select, setBackColor, setBorderType, setEnabled, setImage, setInsetSize, setInsetSizeHorizontal, setInsetSizeVertical, setLabel, setLabel, setOutOfDate, setPreferredSize, setSelectedCheckbox, setState, setText, setText, setTitle, setVisible, update`

    - ### Methods inherited from class java.awt.Panel

      `addNotify, getAccessibleContext`

    - ### Methods inherited from class java.awt.Container

      `add, add, add, add, add, addContainerListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, countComponents, deliverEvent, doLayout, findComponentAt, findComponentAt, getAlignmentX, getAlignmentY, getComponent, getComponentAt, getComponentAt, getComponentCount, getComponents, getComponentZOrder, getContainerListeners, getFocusTraversalKeys, getFocusTraversalPolicy, getLayout, getListeners, getMaximumSize, getMinimumSize, getMousePosition, insets, invalidate, isAncestorOf, isFocusCycleRoot, isFocusCycleRoot, isFocusTraversalPolicyProvider, isFocusTraversalPolicySet, isValidateRoot, layout, list, list, locate, minimumSize, paintComponents, preferredSize, print, printComponents, remove, remove, removeAll, removeContainerListener, removeNotify, setComponentZOrder, setFocusCycleRoot, setFocusTraversalKeys, setFocusTraversalPolicy, setFocusTraversalPolicyProvider, setFont, setLayout, transferFocusDownCycle, validate`

    - ### Methods inherited from class java.awt.Component

      `action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, bounds, checkImage, checkImage, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, disable, dispatchEvent, enable, enable, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, firePropertyChange, getBackground, getBaseline, getBaselineResizeBehavior, getBounds, getBounds, getColorModel, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMouseListeners, getMouseMotionListeners, getMousePosition, getMouseWheelListeners, getName, getParent, getPeer, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, isBackgroundSet, isCursorSet, isDisplayable, isDoubleBuffered, isEnabled, isFocusable, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isMaximumSizeSet, isMinimumSizeSet, isOpaque, isPreferredSizeSet, isShowing, isValid, isVisible, keyDown, keyUp, list, list, list, location, lostFocus, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, postEvent, prepareImage, prepareImage, printAll, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removePropertyChangeListener, removePropertyChangeListener, repaint, repaint, repaint, repaint, requestFocus, requestFocusInWindow, reshape, resize, resize, revalidate, setBackground, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeysEnabled, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setMaximumSize, setMinimumSize, setName, setPreferredSize, setSize, setSize, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle`

    - ### Methods inherited from class java.lang.Object

      `equals, getClass, hashCode, notify, notifyAll, wait, wait, wait`

    - ### Methods inherited from interface jv.object.PsUpdateIf

      `getName`

- - ### Constructor Detail

    - #### MyClass_IP

          public MyClass_IP()

      Create and layout the widgets of the panel.

  - ### Method Detail

    - #### init

          public void init()

      Set values of variables. Method is also used to reset the panel.
      Overrides:
        `init` in class `PsPanel`

    - #### setParent

          public void setParent(PsUpdateIf parent)

      Set parent of panel which supplies the data inspected by the panel.
      Specified by:
        `setParent` in interface `PsUpdateIf`
      Overrides:
        `setParent` in class `PsPanel`
      Parameters:
        `parent` - parent of this panel
      See Also:
        `PsPanel.getFather()`

    - #### update

          public boolean update(java.lang.Object event)

      Update the panel whenever the parent has changed somewhere else. Method is invoked from the parent or its superclasses.
      Specified by:
        `update` in interface `PsUpdateIf`
      Overrides:
        `update` in class `PsPanel`
      Parameters:
        `event` - carries a lot of information
      Returns:
        true if event has been handled, otherwise false
      See Also:
        `PsObject`, `PsUpdateIf.getFather()`, `PsUpdateIf.setParent(PsUpdateIf)`

    - #### actionPerformed

          public void actionPerformed(java.awt.event.ActionEvent event)

      Handle action events invoked from buttons, menu items, text fields.
      Specified by:
        `actionPerformed` in interface `java.awt.event.ActionListener`

    - #### itemStateChanged

          public void itemStateChanged(java.awt.event.ItemEvent event)

      Handle item state events invoked from choices, checkboxes, list items.
      Specified by:
        `itemStateChanged` in interface `java.awt.event.ItemListener`

    - #### textValueChanged

          public void textValueChanged(java.awt.event.TextEvent event)

      Handle any chances in text field. After any keystroke an event is sent, therefore, catching these events frees the user from pressing .
      Specified by:
        `textValueChanged` in interface `java.awt.event.TextListener`

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The software JavaView? is copyright protected. All Rights Reserved.
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