public class MyClass_IP extends PsPanel implements java.awt.event.ActionListener, java.awt.event.ItemListener, java.awt.event.TextListener
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 mechanism 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 recomputation 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.
PsObject
,
PsUpdateIf
,
Serialized FormBORDER_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
Constructor and Description |
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MyClass_IP()
Create and layout the widgets of the panel.
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Modifier and Type | Method and Description |
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void |
actionPerformed(java.awt.event.ActionEvent event)
Handle action events invoked from buttons, menu items, text fields.
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void |
init()
Set values of variables.
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void |
itemStateChanged(java.awt.event.ItemEvent event)
Handle item state events invoked from choices, checkboxes, list items.
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void |
setParent(PsUpdateIf parent)
Set parent of panel which supplies the data inspected by the panel.
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void |
textValueChanged(java.awt.event.TextEvent event)
Handle any chances in text field.
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boolean |
update(java.lang.Object event)
Update the panel whenever the parent has changed somewhere else.
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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
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
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
equals, getClass, hashCode, notify, notifyAll, wait, wait, wait
getName
public void init()
public void setParent(PsUpdateIf parent)
setParent
in interface PsUpdateIf
setParent
in class PsPanel
parent
- parent of this panelPsPanel.getFather()
public boolean update(java.lang.Object event)
update
in interface PsUpdateIf
update
in class PsPanel
event
- carries a lot of informationPsObject
,
PsUpdateIf.getFather()
,
PsUpdateIf.setParent(PsUpdateIf)
public void actionPerformed(java.awt.event.ActionEvent event)
actionPerformed
in interface java.awt.event.ActionListener
public void itemStateChanged(java.awt.event.ItemEvent event)
itemStateChanged
in interface java.awt.event.ItemListener
public void textValueChanged(java.awt.event.TextEvent event)
<enter>
.textValueChanged
in interface java.awt.event.TextListener
"