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javax.swing
Class AbstractButton
java.lang.Object
java.awt.Component
java.awt.Container
javax.swing.JComponent
javax.swing.AbstractButton
-
All Implemented Interfaces:
-
ImageObserver
,
ItemSelectable
,
MenuContainer
,
Serializable
,
SwingConstants
-
Direct Known Subclasses:
-
JButton
,
JMenuItem
,
JToggleButton
-
public abstract class AbstractButton
- extends JComponent
- implements ItemSelectable, SwingConstants
Defines common behaviors for buttons and menu items. For further information see
How to Use Buttons, Check Boxes, and Radio Buttons
, a section in The Java Tutorial.
Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans
TM
has been added to the java.beans package. Please see
XMLEncoder
.
Nested Class Summary
|
protected class |
AbstractButton.AccessibleAbstractButton
This class implements accessibility support for the AbstractButton class. |
protected class |
AbstractButton.ButtonChangeListener
Extends ChangeListener to be serializable. |
Nested classes/interfaces inherited from class javax.swing.
JComponent
|
JComponent.AccessibleJComponent
|
Nested classes/interfaces inherited from class java.awt.
Container
|
Container.AccessibleAWTContainer
|
Nested classes/interfaces inherited from class java.awt.
Component
|
Component.AccessibleAWTComponent
,
Component.BltBufferStrategy
,
Component.FlipBufferStrategy
|
Fields inherited from interface javax.swing.
SwingConstants
|
BOTTOM
,
CENTER
,
EAST
,
HORIZONTAL
,
LEADING
,
LEFT
,
NEXT
,
NORTH
,
NORTH_EAST
,
NORTH_WEST
,
PREVIOUS
,
RIGHT
,
SOUTH
,
SOUTH_EAST
,
SOUTH_WEST
,
TOP
,
TRAILING
,
VERTICAL
,
WEST
|
Fields inherited from interface java.awt.image.
ImageObserver
|
ABORT
,
ALLBITS
,
ERROR
,
FRAMEBITS
,
HEIGHT
,
PROPERTIES
,
SOMEBITS
,
WIDTH
|
Method Summary
|
void |
addActionListener
(
ActionListener
l)
Adds an ActionListener to the button. |
void |
addChangeListener
(
ChangeListener
l)
Adds a ChangeListener to the button. |
protected void |
addImpl
(
Component
comp,
Object
constraints, int index)
Adds the specified component to this container at the specified index, refer to
Container.addImpl(Component, Object, int)
for a complete description of this method. |
void |
addItemListener
(
ItemListener
l)
Adds an ItemListener to the checkbox. |
protected int |
checkHorizontalKey
(int key,
String
exception)
Verify that key is a legal value for the horizontalAlignment properties. |
protected int |
checkVerticalKey
(int key,
String
exception)
Ensures that the key is a valid. |
protected void |
configurePropertiesFromAction
(
Action
a)
Factory method which sets the ActionEvent source's properties according to values from the Action instance. |
protected
ActionListener
|
createActionListener
()
|
protected
PropertyChangeListener
|
createActionPropertyChangeListener
(
Action
a)
Factory method which creates the PropertyChangeListener used to update the ActionEvent source as properties change on its Action instance. |
protected
ChangeListener
|
createChangeListener
()
Subclasses that want to handle ChangeEvents differently can override this to return another ChangeListener implementation. |
protected
ItemListener
|
createItemListener
()
|
void |
doClick
()
Programmatically perform a "click". |
void |
doClick
(int pressTime)
Programmatically perform a "click". |
protected void |
fireActionPerformed
(
ActionEvent
event)
Notifies all listeners that have registered interest for notification on this event type. |
protected void |
fireItemStateChanged
(
ItemEvent
event)
Notifies all listeners that have registered interest for notification on this event type. |
protected void |
fireStateChanged
()
Notifies all listeners that have registered interest for notification on this event type. |
Action
|
getAction
()
Returns the currently set Action for this ActionEvent source, or null if no Action is set. |
String
|
getActionCommand
()
Returns the action command for this button. |
ActionListener
[] |
getActionListeners
()
Returns an array of all the ActionListeners added to this AbstractButton with addActionListener(). |
ChangeListener
[] |
getChangeListeners
()
Returns an array of all the ChangeListeners added to this AbstractButton with addChangeListener(). |
Icon
|
getDisabledIcon
()
Returns the icon used by the button when it's disabled. |
Icon
|
getDisabledSelectedIcon
()
Returns the icon used by the button when it's disabled and selected. |
int |
getDisplayedMnemonicIndex
()
Returns the character, as an index, that the look and feel should provide decoration for as representing the mnemonic character. |
int |
getHorizontalAlignment
()
Returns the horizontal alignment of the icon and text. |
int |
getHorizontalTextPosition
()
Returns the horizontal position of the text relative to the icon. |
Icon
|
getIcon
()
Returns the default icon. |
int |
getIconTextGap
()
Returns the amount of space between the text and the icon displayed in this button. |
ItemListener
[] |
getItemListeners
()
Returns an array of all the ItemListeners added to this AbstractButton with addItemListener(). |
String
|
getLabel
()
Deprecated.
- Replaced by getText
|
Insets
|
getMargin
()
Returns the margin between the button's border and the label. |
int |
getMnemonic
()
Returns the keyboard mnemonic from the the current model. |
ButtonModel
|
getModel
()
Returns the model that this button represents. |
long |
getMultiClickThreshhold
()
Gets the amount of time (in milliseconds) required between mouse press events for the button to generate the corresponding action events. |
Icon
|
getPressedIcon
()
Returns the pressed icon for the button. |
Icon
|
getRolloverIcon
()
Returns the rollover icon for the button. |
Icon
|
getRolloverSelectedIcon
()
Returns the rollover selection icon for the button. |
Icon
|
getSelectedIcon
()
Returns the selected icon for the button. |
Object
[] |
getSelectedObjects
()
Returns an array (length 1) containing the label or null if the button is not selected. |
String
|
getText
()
Returns the button's text. |
ButtonUI
|
getUI
()
Returns the L&F object that renders this component. |
int |
getVerticalAlignment
()
Returns the vertical alignment of the text and icon. |
int |
getVerticalTextPosition
()
Returns the vertical position of the text relative to the icon. |
boolean |
imageUpdate
(
Image
img, int infoflags, int x, int y, int w, int h)
This is overridden to return false if the current Icon's Image is not equal to the passed in Image img. |
protected void |
init
(
String
text,
Icon
icon)
|
boolean |
isBorderPainted
()
Gets the borderPainted property. |
boolean |
isContentAreaFilled
()
Gets the contentAreaFilled property. |
boolean |
isFocusPainted
()
Gets the paintFocus property. |
boolean |
isRolloverEnabled
()
Gets the rolloverEnabled property. |
boolean |
isSelected
()
Returns the state of the button. |
protected void |
paintBorder
(
Graphics
g)
Paint the button's border if BorderPainted property is true and the button has a border. |
protected
String
|
paramString
()
Returns a string representation of this AbstractButton. |
void |
removeActionListener
(
ActionListener
l)
Removes an ActionListener from the button. |
void |
removeChangeListener
(
ChangeListener
l)
Removes a ChangeListener from the button. |
void |
removeItemListener
(
ItemListener
l)
Removes an ItemListener from the button. |
void |
setAction
(
Action
a)
Sets the Action for the ActionEvent source. |
void |
setActionCommand
(
String
actionCommand)
Sets the action command for this button. |
void |
setBorderPainted
(boolean b)
Sets the borderPainted property. |
void |
setContentAreaFilled
(boolean b)
Sets the contentAreaFilled property. |
void |
setDisabledIcon
(
Icon
disabledIcon)
Sets the disabled icon for the button. |
void |
setDisabledSelectedIcon
(
Icon
disabledSelectedIcon)
Sets the disabled selection icon for the button. |
void |
setDisplayedMnemonicIndex
(int index)
Provides a hint to the look and feel as to which character in the text should be decorated to represent the mnemonic. |
void |
setEnabled
(boolean b)
Enables (or disables) the button. |
void |
setFocusPainted
(boolean b)
Sets the paintFocus property, which must be true for the focus state to be painted. |
void |
setHorizontalAlignment
(int alignment)
Sets the horizontal alignment of the icon and text. |
void |
setHorizontalTextPosition
(int textPosition)
Sets the horizontal position of the text relative to the icon. |
void |
setIcon
(
Icon
defaultIcon)
Sets the button's default icon. |
void |
setIconTextGap
(int iconTextGap)
If both the icon and text properties are set, this property defines the space between them. |
void |
setLabel
(
String
label)
Deprecated.
- Replaced by setText(text)
|
void |
setLayout
(
LayoutManager
mgr)
Sets the layout manager for this container, refer to
Container.setLayout(LayoutManager)
for a complete description of this method. |
void |
setMargin
(
Insets
m)
Sets space for margin between the button's border and the label. |
void |
setMnemonic
(char mnemonic)
This method is now obsolete, please use setMnemonic(int) to set the mnemonic for a button. |
void |
setMnemonic
(int mnemonic)
Sets the keyboard mnemonic on the current model. |
void |
setModel
(
ButtonModel
newModel)
Sets the model that this button represents. |
void |
setMultiClickThreshhold
(long threshhold)
Sets the amount of time (in milliseconds) required between mouse press events for the button to generate the corresponding action events. |
void |
setPressedIcon
(
Icon
pressedIcon)
Sets the pressed icon for the button. |
void |
setRolloverEnabled
(boolean b)
Sets the rolloverEnabled property, which must be true for rollover effects to occur. |
void |
setRolloverIcon
(
Icon
rolloverIcon)
Sets the rollover icon for the button. |
void |
setRolloverSelectedIcon
(
Icon
rolloverSelectedIcon)
Sets the rollover selected icon for the button. |
void |
setSelected
(boolean b)
Sets the state of the button. |
void |
setSelectedIcon
(
Icon
selectedIcon)
Sets the selected icon for the button. |
void |
setText
(
String
text)
Sets the button's text. |
void |
setUI
(
ButtonUI
ui)
Sets the L&F object that renders this component. |
void |
setVerticalAlignment
(int alignment)
Sets the vertical alignment of the icon and text. |
void |
setVerticalTextPosition
(int textPosition)
Sets the vertical position of the text relative to the icon. |
void |
updateUI
()
Resets the UI property to a value from the current look and feel. |
Methods inherited from class javax.swing.
JComponent
|
addAncestorListener
,
addNotify
,
addVetoableChangeListener
,
computeVisibleRect
,
contains
,
createToolTip
,
disable
,
enable
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
fireVetoableChange
,
getAccessibleContext
,
getActionForKeyStroke
,
getActionMap
,
getAlignmentX
,
getAlignmentY
,
getAncestorListeners
,
getAutoscrolls
,
getBorder
,
getBounds
,
getClientProperty
,
getComponentGraphics
,
getComponentPopupMenu
,
getConditionForKeyStroke
,
getDebugGraphicsOptions
,
getDefaultLocale
,
getFontMetrics
,
getGraphics
,
getHeight
,
getInheritsPopupMenu
,
getInputMap
,
getInputMap
,
getInputVerifier
,
getInsets
,
getInsets
,
getListeners
,
getLocation
,
getMaximumSize
,
getMinimumSize
,
getNextFocusableComponent
,
getPopupLocation
,
getPreferredSize
,
getRegisteredKeyStrokes
,
getRootPane
,
getSize
,
getToolTipLocation
,
getToolTipText
,
getToolTipText
,
getTopLevelAncestor
,
getTransferHandler
,
getUIClassID
,
getVerifyInputWhenFocusTarget
,
getVetoableChangeListeners
,
getVisibleRect
,
getWidth
,
getX
,
getY
,
grabFocus
,
isDoubleBuffered
,
isLightweightComponent
,
isManagingFocus
,
isOpaque
,
isOptimizedDrawingEnabled
,
isPaintingTile
,
isRequestFocusEnabled
,
isValidateRoot
,
paint
,
paintChildren
,
paintComponent
,
paintImmediately
,
paintImmediately
,
print
,
printAll
,
printBorder
,
printChildren
,
printComponent
,
processComponentKeyEvent
,
processKeyBinding
,
processKeyEvent
,
processMouseEvent
,
processMouseMotionEvent
,
putClientProperty
,
registerKeyboardAction
,
registerKeyboardAction
,
removeAncestorListener
,
removeNotify
,
removeVetoableChangeListener
,
repaint
,
repaint
,
requestDefaultFocus
,
requestFocus
,
requestFocus
,
requestFocusInWindow
,
requestFocusInWindow
,
resetKeyboardActions
,
reshape
,
revalidate
,
scrollRectToVisible
,
setActionMap
,
setAlignmentX
,
setAlignmentY
,
setAutoscrolls
,
setBackground
,
setBorder
,
setComponentPopupMenu
,
setDebugGraphicsOptions
,
setDefaultLocale
,
setDoubleBuffered
,
setFocusTraversalKeys
,
setFont
,
setForeground
,
setInheritsPopupMenu
,
setInputMap
,
setInputVerifier
,
setMaximumSize
,
setMinimumSize
,
setNextFocusableComponent
,
setOpaque
,
setPreferredSize
,
setRequestFocusEnabled
,
setToolTipText
,
setTransferHandler
,
setUI
,
setVerifyInputWhenFocusTarget
,
setVisible
,
unregisterKeyboardAction
,
update
|
Methods inherited from class java.awt.
Container
|
add
,
add
,
add
,
add
,
add
,
addContainerListener
,
addPropertyChangeListener
,
addPropertyChangeListener
,
applyComponentOrientation
,
areFocusTraversalKeysSet
,
countComponents
,
deliverEvent
,
doLayout
,
findComponentAt
,
findComponentAt
,
getComponent
,
getComponentAt
,
getComponentAt
,
getComponentCount
,
getComponents
,
getComponentZOrder
,
getContainerListeners
,
getFocusTraversalKeys
,
getFocusTraversalPolicy
,
getLayout
,
getMousePosition
,
insets
,
invalidate
,
isAncestorOf
,
isFocusCycleRoot
,
isFocusCycleRoot
,
isFocusTraversalPolicyProvider
,
isFocusTraversalPolicySet
,
layout
,
list
,
list
,
locate
,
minimumSize
,
paintComponents
,
preferredSize
,
printComponents
,
processContainerEvent
,
processEvent
,
remove
,
remove
,
removeAll
,
removeContainerListener
,
setComponentZOrder
,
setFocusCycleRoot
,
setFocusTraversalPolicy
,
setFocusTraversalPolicyProvider
,
transferFocusBackward
,
transferFocusDownCycle
,
validate
,
validateTree
|
Methods inherited from class java.awt.
Component
|
action
,
add
,
addComponentListener
,
addFocusListener
,
addHierarchyBoundsListener
,
addHierarchyListener
,
addInputMethodListener
,
addKeyListener
,
addMouseListener
,
addMouseMotionListener
,
addMouseWheelListener
,
bounds
,
checkImage
,
checkImage
,
coalesceEvents
,
contains
,
createImage
,
createImage
,
createVolatileImage
,
createVolatileImage
,
disableEvents
,
dispatchEvent
,
enable
,
enableEvents
,
enableInputMethods
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
firePropertyChange
,
getBackground
,
getBounds
,
getColorModel
,
getComponentListeners
,
getComponentOrientation
,
getCursor
,
getDropTarget
,
getFocusCycleRootAncestor
,
getFocusListeners
,
getFocusTraversalKeysEnabled
,
getFont
,
getForeground
,
getGraphicsConfiguration
,
getHierarchyBoundsListeners
,
getHierarchyListeners
,
getIgnoreRepaint
,
getInputContext
,
getInputMethodListeners
,
getInputMethodRequests
,
getKeyListeners
,
getLocale
,
getLocation
,
getLocationOnScreen
,
getMouseListeners
,
getMouseMotionListeners
,
getMousePosition
,
getMouseWheelListeners
,
getName
,
getParent
,
getPeer
,
getPropertyChangeListeners
,
getPropertyChangeListeners
,
getSize
,
getToolkit
,
getTreeLock
,
gotFocus
,
handleEvent
,
hasFocus
,
hide
,
inside
,
isBackgroundSet
,
isCursorSet
,
isDisplayable
,
isEnabled
,
isFocusable
,
isFocusOwner
,
isFocusTraversable
,
isFontSet
,
isForegroundSet
,
isLightweight
,
isMaximumSizeSet
,
isMinimumSizeSet
,
isPreferredSizeSet
,
isShowing
,
isValid
,
isVisible
,
keyDown
,
keyUp
,
list
,
list
,
list
,
location
,
lostFocus
,
mouseDown
,
mouseDrag
,
mouseEnter
,
mouseExit
,
mouseMove
,
mouseUp
,
move
,
nextFocus
,
paintAll
,
postEvent
,
prepareImage
,
prepareImage
,
processComponentEvent
,
processFocusEvent
,
processHierarchyBoundsEvent
,
processHierarchyEvent
,
processInputMethodEvent
,
processMouseWheelEvent
,
remove
,
removeComponentListener
,
removeFocusListener
,
removeHierarchyBoundsListener
,
removeHierarchyListener
,
removeInputMethodListener
,
removeKeyListener
,
removeMouseListener
,
removeMouseMotionListener
,
removeMouseWheelListener
,
removePropertyChangeListener
,
removePropertyChangeListener
,
repaint
,
repaint
,
repaint
,
resize
,
resize
,
setBounds
,
setBounds
,
setComponentOrientation
,
setCursor
,
setDropTarget
,
setFocusable
,
setFocusTraversalKeysEnabled
,
setIgnoreRepaint
,
setLocale
,
setLocation
,
setLocation
,
setName
,
setSize
,
setSize
,
show
,
show
,
size
,
toString
,
transferFocus
,
transferFocusUpCycle
|
Methods inherited from class java.lang.
Object
|
clone
,
equals
,
finalize
,
getClass
,
hashCode
,
notify
,
notifyAll
,
wait
,
wait
,
wait
|
MODEL_CHANGED_PROPERTY
public static final String MODEL_CHANGED_PROPERTY
-
Identifies a change in the button model.
-
See Also:
-
Constant Field Values
TEXT_CHANGED_PROPERTY
public static final String TEXT_CHANGED_PROPERTY
-
Identifies a change in the button's text.
-
See Also:
-
Constant Field Values
MNEMONIC_CHANGED_PROPERTY
public static final String MNEMONIC_CHANGED_PROPERTY
-
Identifies a change to the button's mnemonic.
-
See Also:
-
Constant Field Values
MARGIN_CHANGED_PROPERTY
public static final String MARGIN_CHANGED_PROPERTY
-
Identifies a change in the button's margins.
-
See Also:
-
Constant Field Values
VERTICAL_ALIGNMENT_CHANGED_PROPERTY
public static final String VERTICAL_ALIGNMENT_CHANGED_PROPERTY
-
Identifies a change in the button's vertical alignment.
-
See Also:
-
Constant Field Values
HORIZONTAL_ALIGNMENT_CHANGED_PROPERTY
public static final String HORIZONTAL_ALIGNMENT_CHANGED_PROPERTY
-
Identifies a change in the button's horizontal alignment.
-
See Also:
-
Constant Field Values
VERTICAL_TEXT_POSITION_CHANGED_PROPERTY
public static final String VERTICAL_TEXT_POSITION_CHANGED_PROPERTY
-
Identifies a change in the button's vertical text position.
-
See Also:
-
Constant Field Values
HORIZONTAL_TEXT_POSITION_CHANGED_PROPERTY
public static final String HORIZONTAL_TEXT_POSITION_CHANGED_PROPERTY
-
Identifies a change in the button's horizontal text position.
-
See Also:
-
Constant Field Values
BORDER_PAINTED_CHANGED_PROPERTY
public static final String BORDER_PAINTED_CHANGED_PROPERTY
-
Identifies a change to having the border drawn, or having it not drawn.
-
See Also:
-
Constant Field Values
FOCUS_PAINTED_CHANGED_PROPERTY
public static final String FOCUS_PAINTED_CHANGED_PROPERTY
-
Identifies a change to having the border highlighted when focused, or not.
-
See Also:
-
Constant Field Values
ROLLOVER_ENABLED_CHANGED_PROPERTY
public static final String ROLLOVER_ENABLED_CHANGED_PROPERTY
-
Identifies a change from rollover enabled to disabled or back to enabled.
-
See Also:
-
Constant Field Values
CONTENT_AREA_FILLED_CHANGED_PROPERTY
public static final String CONTENT_AREA_FILLED_CHANGED_PROPERTY
-
Identifies a change to having the button paint the content area.
-
See Also:
-
Constant Field Values
ICON_CHANGED_PROPERTY
public static final String ICON_CHANGED_PROPERTY
-
Identifies a change to the icon that represents the button.
-
See Also:
-
Constant Field Values
PRESSED_ICON_CHANGED_PROPERTY
public static final String PRESSED_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the button has been pressed.
-
See Also:
-
Constant Field Values
SELECTED_ICON_CHANGED_PROPERTY
public static final String SELECTED_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the button has been selected.
-
See Also:
-
Constant Field Values
ROLLOVER_ICON_CHANGED_PROPERTY
public static final String ROLLOVER_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the cursor is over the button.
-
See Also:
-
Constant Field Values
ROLLOVER_SELECTED_ICON_CHANGED_PROPERTY
public static final String ROLLOVER_SELECTED_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the cursor is over the button and it has been selected.
-
See Also:
-
Constant Field Values
DISABLED_ICON_CHANGED_PROPERTY
public static final String DISABLED_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the button has been disabled.
-
See Also:
-
Constant Field Values
DISABLED_SELECTED_ICON_CHANGED_PROPERTY
public static final String DISABLED_SELECTED_ICON_CHANGED_PROPERTY
-
Identifies a change to the icon used when the button has been disabled and selected.
-
See Also:
-
Constant Field Values
model
protected ButtonModel model
-
The data model that determines the button's state.
changeListener
protected ChangeListener changeListener
-
The button model's changeListener.
actionListener
protected ActionListener actionListener
-
The button model's ActionListener.
itemListener
protected ItemListener itemListener
-
The button model's ItemListener.
changeEvent
protected transient ChangeEvent changeEvent
-
Only one ChangeEvent is needed per button instance since the event's only state is the source property. The source of events generated is always "this".
AbstractButton
public AbstractButton()
getText
public String getText()
-
Returns the button's text.
-
-
-
Returns:
-
the buttons text
-
See Also:
-
setText(java.lang.String)
setText
public void setText(String text)
-
Sets the button's text.
-
-
-
Parameters:
-
text - the string used to set the text
-
See Also:
-
getText()
isSelected
public boolean isSelected()
-
Returns the state of the button. True if the toggle button is selected, false if it's not.
-
-
-
Returns:
-
true if the toggle button is selected, otherwise false
setSelected
public void setSelected(boolean b)
-
Sets the state of the button. Note that this method does not trigger an actionEvent. Call doClick to perform a programatic action change.
-
-
-
Parameters:
-
b - true if the button is selected, otherwise false
doClick
public void doClick()
-
Programmatically perform a "click". This does the same thing as if the user had pressed and released the button.
-
-
doClick
public void doClick(int pressTime)
-
Programmatically perform a "click". This does the same thing as if the user had pressed and released the button. The button stays visually "pressed" for pressTime milliseconds.
-
-
-
Parameters:
-
pressTime - the time to "hold down" the button, in milliseconds
setMargin
public void setMargin(Insets m)
-
Sets space for margin between the button's border and the label. Setting to null will cause the button to use the default margin. The button's default Border object will use this value to create the proper margin. However, if a non-default border is set on the button, it is that Border object's responsibility to create the appropriate margin space (else this property will effectively be ignored).
-
-
-
Parameters:
-
m - the space between the border and the label
getMargin
public Insets getMargin()
-
Returns the margin between the button's border and the label.
-
-
-
Returns:
-
an Insets object specifying the margin between the botton's border and the label
-
See Also:
-
setMargin(java.awt.Insets)
getIcon
public Icon getIcon()
-
Returns the default icon.
-
-
-
Returns:
-
the default Icon
-
See Also:
-
setIcon(javax.swing.Icon)
setIcon
public void setIcon(Icon defaultIcon)
-
Sets the button's default icon. This icon is also used as the "pressed" and "disabled" icon if there is no explicitly set pressed icon.
-
-
-
Parameters:
-
defaultIcon - the icon used as the default image
-
See Also:
-
getIcon()
,
setPressedIcon(javax.swing.Icon)
getPressedIcon
public Icon getPressedIcon()
-
Returns the pressed icon for the button.
-
-
-
Returns:
-
the pressedIcon property
-
See Also:
-
setPressedIcon(javax.swing.Icon)
setPressedIcon
public void setPressedIcon(Icon pressedIcon)
-
Sets the pressed icon for the button.
-
-
-
Parameters:
-
pressedIcon - the icon used as the "pressed" image
-
See Also:
-
getPressedIcon()
getSelectedIcon
public Icon getSelectedIcon()
-
Returns the selected icon for the button.
-
-
-
Returns:
-
the selectedIcon property
-
See Also:
-
setSelectedIcon(javax.swing.Icon)
setSelectedIcon
public void setSelectedIcon(Icon selectedIcon)
-
Sets the selected icon for the button.
-
-
-
Parameters:
-
selectedIcon - the icon used as the "selected" image
-
See Also:
-
getSelectedIcon()
getRolloverIcon
public Icon getRolloverIcon()
-
Returns the rollover icon for the button.
-
-
-
Returns:
-
the rolloverIcon property
-
See Also:
-
setRolloverIcon(javax.swing.Icon)
setRolloverIcon
public void setRolloverIcon(Icon rolloverIcon)
-
Sets the rollover icon for the button.
-
-
-
Parameters:
-
rolloverIcon - the icon used as the "rollover" image
-
See Also:
-
getRolloverIcon()
getRolloverSelectedIcon
public Icon getRolloverSelectedIcon()
-
Returns the rollover selection icon for the button.
-
-
-
Returns:
-
the rolloverSelectedIcon property
-
See Also:
-
setRolloverSelectedIcon(javax.swing.Icon)
setRolloverSelectedIcon
public void setRolloverSelectedIcon(Icon rolloverSelectedIcon)
-
Sets the rollover selected icon for the button.
-
-
-
Parameters:
-
rolloverSelectedIcon - the icon used as the "selected rollover" image
-
See Also:
-
getRolloverSelectedIcon()
getDisabledIcon
public Icon getDisabledIcon()
-
Returns the icon used by the button when it's disabled. If no disabled icon has been set this will forward the call to the look and feel to construct an appropriate disabled Icon.
Some look and feels might not render the disabled Icon, in which case they will ignore this.
-
-
-
Returns:
-
the disabledIcon property
-
See Also:
-
getPressedIcon()
,
setDisabledIcon(javax.swing.Icon)
,
LookAndFeel.getDisabledIcon(javax.swing.JComponent, javax.swing.Icon)
setDisabledIcon
public void setDisabledIcon(Icon disabledIcon)
-
Sets the disabled icon for the button.
-
-
-
Parameters:
-
disabledIcon - the icon used as the disabled image
-
See Also:
-
getDisabledIcon()
getDisabledSelectedIcon
public Icon getDisabledSelectedIcon()
-
Returns the icon used by the button when it's disabled and selected. If no disabled selection icon has been set, this will forward the call to the LookAndFeel to construct an appropriate disabled Icon from the selection icon if it has been set and to getDisabledIcon() otherwise.
Some look and feels might not render the disabled selected Icon, in which case they will ignore this.
-
-
-
Returns:
-
the disabledSelectedIcon property
-
See Also:
-
getDisabledIcon()
,
setDisabledSelectedIcon(javax.swing.Icon)
,
LookAndFeel.getDisabledSelectedIcon(javax.swing.JComponent, javax.swing.Icon)
setDisabledSelectedIcon
public void setDisabledSelectedIcon(Icon disabledSelectedIcon)
-
Sets the disabled selection icon for the button.
-
-
-
Parameters:
-
disabledSelectedIcon - the icon used as the disabled selection image
-
See Also:
-
getDisabledSelectedIcon()
getVerticalAlignment
public int getVerticalAlignment()
-
Returns the vertical alignment of the text and icon.
-
-
-
Returns:
-
the verticalAlignment property, one of the following values:
-
SwingConstants.CENTER (the default)
-
SwingConstants.TOP
-
SwingConstants.BOTTOM
setVerticalAlignment
public void setVerticalAlignment(int alignment)
-
Sets the vertical alignment of the icon and text.
-
-
-
Parameters:
-
alignment - one of the following values:
-
SwingConstants.CENTER (the default)
-
SwingConstants.TOP
-
SwingConstants.BOTTOM
getHorizontalAlignment
public int getHorizontalAlignment()
-
Returns the horizontal alignment of the icon and text.
-
-
-
Returns:
-
the horizontalAlignment property, one of the following values:
-
SwingConstants.RIGHT (the default)
-
SwingConstants.LEFT
-
SwingConstants.CENTER
-
SwingConstants.LEADING
-
SwingConstants.TRAILING
setHorizontalAlignment
public void setHorizontalAlignment(int alignment)
-
Sets the horizontal alignment of the icon and text.
-
-
-
Parameters:
-
alignment - one of the following values:
-
SwingConstants.RIGHT (the default)
-
SwingConstants.LEFT
-
SwingConstants.CENTER
-
SwingConstants.LEADING
-
SwingConstants.TRAILING
getVerticalTextPosition
public int getVerticalTextPosition()
-
Returns the vertical position of the text relative to the icon.
-
-
-
Returns:
-
the verticalTextPosition property, one of the following values:
-
SwingConstants.CENTER (the default)
-
SwingConstants.TOP
-
SwingConstants.BOTTOM
setVerticalTextPosition
public void setVerticalTextPosition(int textPosition)
-
Sets the vertical position of the text relative to the icon.
-
-
-
Parameters:
-
textPosition - one of the following values:
-
SwingConstants.CENTER (the default)
-
SwingConstants.TOP
-
SwingConstants.BOTTOM
getHorizontalTextPosition
public int getHorizontalTextPosition()
-
Returns the horizontal position of the text relative to the icon.
-
-
-
Returns:
-
the horizontalTextPosition property, one of the following values:
-
SwingConstants.RIGHT
-
SwingConstants.LEFT
-
SwingConstants.CENTER
-
SwingConstants.LEADING
-
SwingConstants.TRAILING (the default)
setHorizontalTextPosition
public void setHorizontalTextPosition(int textPosition)
-
Sets the horizontal position of the text relative to the icon.
-
-
-
Parameters:
-
textPosition - one of the following values:
-
SwingConstants.RIGHT
-
SwingConstants.LEFT
-
SwingConstants.CENTER
-
SwingConstants.LEADING
-
SwingConstants.TRAILING (the default)
-
Throws:
-
IllegalArgumentException
- if textPosition is not one of the legal values listed above
getIconTextGap
public int getIconTextGap()
-
Returns the amount of space between the text and the icon displayed in this button.
-
-
-
Returns:
-
an int equal to the number of pixels between the text and the icon.
-
Since:
-
1.4
-
See Also:
-
setIconTextGap(int)
setIconTextGap
public void setIconTextGap(int iconTextGap)
-
If both the icon and text properties are set, this property defines the space between them.
The default value of this property is 4 pixels.
This is a JavaBeans bound property.
-
-
-
Since:
-
1.4
-
See Also:
-
getIconTextGap()
checkHorizontalKey
protected int checkHorizontalKey(int key,
String exception)
-
Verify that key is a legal value for the horizontalAlignment properties.
-
-
-
Parameters:
-
key - the property value to check, one of the following values:
-
SwingConstants.RIGHT (the default)
-
SwingConstants.LEFT
-
SwingConstants.CENTER
-
SwingConstants.LEADING
-
SwingConstants.TRAILING
-
exception - the IllegalArgumentException detail message
-
Throws:
-
IllegalArgumentException
- if key is not one of the legal values listed above
-
See Also:
-
setHorizontalTextPosition(int)
,
setHorizontalAlignment(int)
checkVerticalKey
protected int checkVerticalKey(int key,
String exception)
-
Ensures that the key is a valid. Throws an IllegalArgumentException exception otherwise.
-
-
-
Parameters:
-
key - the value to check, one of the following values:
-
SwingConstants.CENTER (the default)
-
SwingConstants.TOP
-
SwingConstants.BOTTOM
-
exception - a string to be passed to the IllegalArgumentException call if key is not one of the valid values listed above
-
Throws:
-
IllegalArgumentException
- if key is not one of the legal values listed above
setActionCommand
public void setActionCommand(String actionCommand)
-
Sets the action command for this button.
-
-
-
Parameters:
-
actionCommand - the action command for this button
getActionCommand
public String getActionCommand()
-
Returns the action command for this button.
-
-
-
Returns:
-
the action command for this button
setAction
public void setAction(Action a)
-
Sets the Action for the ActionEvent source. The new Action replaces any previously set Action but does not affect ActionListeners independently added with addActionListener. If the Action is already a registered ActionListener for the button, it is not re-registered.
A side-effect of setting the Action is that the ActionEvent source's properties are immediately set from the values in the Action (performed by the method configurePropertiesFromAction) and subsequently updated as the Action's properties change (via a PropertyChangeListener created by the method createActionPropertyChangeListener.
-
-
-
Parameters:
-
a - the Action for the AbstractButton, or null
-
Since:
-
1.3
-
See Also:
-
Action
,
getAction()
,
configurePropertiesFromAction(javax.swing.Action)
,
createActionPropertyChangeListener(javax.swing.Action)
getAction
public Action getAction()
-
Returns the currently set Action for this ActionEvent source, or null if no Action is set.
-
-
-
Returns:
-
the Action for this ActionEvent source, or null
-
Since:
-
1.3
-
See Also:
-
Action
,
setAction(javax.swing.Action)
configurePropertiesFromAction
protected void configurePropertiesFromAction(Action a)
-
Factory method which sets the ActionEvent source's properties according to values from the Action instance. The properties which are set may differ for subclasses. By default, the properties which get set are Text, Icon, Enabled, ToolTipText, ActionCommand, and Mnemonic.
If the Action passed in is null, the following things will occur:
-
the text is set to null,
-
the icon is set to null,
-
enabled is set to true,
-
the tooltip text is set to null
-
-
-
Parameters:
-
a - the Action from which to get the properties, or null
-
Since:
-
1.3
-
See Also:
-
Action
,
setAction(javax.swing.Action)
createActionPropertyChangeListener
protected PropertyChangeListener createActionPropertyChangeListener(Action a)
-
Factory method which creates the PropertyChangeListener used to update the ActionEvent source as properties change on its Action instance. Subclasses may override this in order to provide their own PropertyChangeListener if the set of properties which should be kept up to date differs from the default properties (Text, Icon, Enabled, ToolTipText, Mnemonic).
Note that PropertyChangeListeners should avoid holding strong references to the ActionEvent source, as this may hinder garbage collection of the ActionEvent source and all components in its containment hierarchy.
-
-
-
Parameters:
-
a - the new action for the button
-
Since:
-
1.3
-
See Also:
-
Action
,
setAction(javax.swing.Action)
isBorderPainted
public boolean isBorderPainted()
-
Gets the borderPainted property.
-
-
-
Returns:
-
the value of the borderPainted property
-
See Also:
-
setBorderPainted(boolean)
setBorderPainted
public void setBorderPainted(boolean b)
-
Sets the borderPainted property. If true and the button has a border, the border is painted. The default value for the borderPainted property is true.
-
-
-
Parameters:
-
b - if true and border property is not null, the border is painted
-
See Also:
-
isBorderPainted()
paintBorder
protected void paintBorder(Graphics g)
-
Paint the button's border if BorderPainted property is true and the button has a border.
-
-
Overrides:
-
paintBorder
in class
JComponent
-
-
Parameters:
-
g - the Graphics context in which to paint
-
See Also:
-
JComponent.paint(java.awt.Graphics)
,
JComponent.setBorder(javax.swing.border.Border)
isFocusPainted
public boolean isFocusPainted()
-
Gets the paintFocus property.
-
-
-
Returns:
-
the paintFocus property
-
See Also:
-
setFocusPainted(boolean)
setFocusPainted
public void setFocusPainted(boolean b)
-
Sets the paintFocus property, which must be true for the focus state to be painted. The default value for the paintFocus property is true. Some look and feels might not paint focus state; they will ignore this property.
-
-
-
Parameters:
-
b - if true, the focus state should be painted
-
See Also:
-
isFocusPainted()
isContentAreaFilled
public boolean isContentAreaFilled()
-
Gets the contentAreaFilled property.
-
-
-
Returns:
-
the contentAreaFilled property
-
See Also:
-
setContentAreaFilled(boolean)
setContentAreaFilled
public void setContentAreaFilled(boolean b)
-
Sets the contentAreaFilled property. If true the button will paint the content area. If you wish to have a transparent button, such as an icon only button, for example, then you should set this to false. Do not call setOpaque(false). The default value for the the contentAreaFilled property is true.
This function may cause the component's opaque property to change.
The exact behavior of calling this function varies on a component-by-component and L&F-by-L&F basis.
-
-
-
Parameters:
-
b - if true, the content should be filled; if false the content area is not filled
-
See Also:
-
isContentAreaFilled()
,
JComponent.setOpaque(boolean)
isRolloverEnabled
public boolean isRolloverEnabled()
-
Gets the rolloverEnabled property.
-
-
-
Returns:
-
the value of the rolloverEnabled property
-
See Also:
-
setRolloverEnabled(boolean)
setRolloverEnabled
public void setRolloverEnabled(boolean b)
-
Sets the rolloverEnabled property, which must be true for rollover effects to occur. The default value for the rolloverEnabled property is false. Some look and feels might not implement rollover effects; they will ignore this property.
-
-
-
Parameters:
-
b - if true, rollover effects should be painted
-
See Also:
-
isRolloverEnabled()
getMnemonic
public int getMnemonic()
-
Returns the keyboard mnemonic from the the current model.
-
-
-
Returns:
-
the keyboard mnemonic from the model
setMnemonic
public void setMnemonic(int mnemonic)
-
Sets the keyboard mnemonic on the current model. The mnemonic is the key which when combined with the look and feel's mouseless modifier (usually Alt) will activate this button if focus is contained somewhere within this button's ancestor window.
A mnemonic must correspond to a single key on the keyboard and should be specified using one of the VK_XXX keycodes defined in java.awt.event.KeyEvent. Mnemonics are case-insensitive, therefore a key event with the corresponding keycode would cause the button to be activated whether or not the Shift modifier was pressed.
If the character defined by the mnemonic is found within the button's label string, the first occurrence of it will be underlined to indicate the mnemonic to the user.
-
-
-
Parameters:
-
mnemonic - the key code which represents the mnemonic
-
See Also:
-
KeyEvent
,
setDisplayedMnemonicIndex(int)
setMnemonic
public void setMnemonic(char mnemonic)
-
This method is now obsolete, please use setMnemonic(int) to set the mnemonic for a button. This method is only designed to handle character values which fall between 'a' and 'z' or 'A' and 'Z'.
-
-
-
Parameters:
-
mnemonic - a char specifying the mnemonic value
-
See Also:
-
setMnemonic(int)
setDisplayedMnemonicIndex
public void setDisplayedMnemonicIndex(int index)
throws IllegalArgumentException
-
Provides a hint to the look and feel as to which character in the text should be decorated to represent the mnemonic. Not all look and feels may support this. A value of -1 indicates either there is no mnemonic, the mnemonic character is not contained in the string, or the developer does not wish the mnemonic to be displayed.
The value of this is updated as the properties relating to the mnemonic change (such as the mnemonic itself, the text...). You should only ever have to call this if you do not wish the default character to be underlined. For example, if the text was 'Save As', with a mnemonic of 'a', and you wanted the 'A' to be decorated, as 'Save
A
s', you would have to invoke setDisplayedMnemonicIndex(5) after invoking setMnemonic(KeyEvent.VK_A).
-
-
-
Parameters:
-
index - Index into the String to underline
-
Throws:
-
IllegalArgumentException
- will be thrown if index is >= length of the text, or < -1
-
Since:
-
1.4
-
See Also:
-
getDisplayedMnemonicIndex()
getDisplayedMnemonicIndex
public int getDisplayedMnemonicIndex()
-
Returns the character, as an index, that the look and feel should provide decoration for as representing the mnemonic character.
-
-
-
Returns:
-
index representing mnemonic character
-
Since:
-
1.4
-
See Also:
-
setDisplayedMnemonicIndex(int)
setMultiClickThreshhold
public void setMultiClickThreshhold(long threshhold)
-
Sets the amount of time (in milliseconds) required between mouse press events for the button to generate the corresponding action events. After the initial mouse press occurs (and action event generated) any subsequent mouse press events which occur on intervals less than the threshhold will be ignored and no corresponding action event generated. By default the threshhold is 0, which means that for each mouse press, an action event will be fired, no matter how quickly the mouse clicks occur. In buttons where this behavior is not desirable (for example, the "OK" button in a dialog), this threshhold should be set to an appropriate positive value.
-
-
-
Parameters:
-
threshhold - the amount of time required between mouse press events to generate corresponding action events
-
Throws:
-
IllegalArgumentException
- if threshhold < 0
-
Since:
-
1.4
-
See Also:
-
getMultiClickThreshhold()
getMultiClickThreshhold
public long getMultiClickThreshhold()
-
Gets the amount of time (in milliseconds) required between mouse press events for the button to generate the corresponding action events.
-
-
-
Returns:
-
the amount of time required between mouse press events to generate corresponding action events
-
Since:
-
1.4
-
See Also:
-
setMultiClickThreshhold(long)
getModel
public ButtonModel getModel()
-
Returns the model that this button represents.
-
-
-
Returns:
-
the model property
-
See Also:
-
setModel(javax.swing.ButtonModel)
setModel
public void setModel(ButtonModel newModel)
-
Sets the model that this button represents.
-
-
-
Parameters:
-
newModel - the new ButtonModel
-
See Also:
-
getModel()
getUI
public ButtonUI getUI()
-
Returns the L&F object that renders this component.
-
-
-
Returns:
-
the ButtonUI object
-
See Also:
-
setUI(javax.swing.plaf.ButtonUI)
setUI
public void setUI(ButtonUI ui)
-
Sets the L&F object that renders this component.
-
-
-
Parameters:
-
ui - the ButtonUI L&F object
-
See Also:
-
getUI()
updateUI
public void updateUI()
-
Resets the UI property to a value from the current look and feel. Subtypes of AbstractButton should override this to update the UI. For example, JButton might do the following:
setUI((ButtonUI)UIManager.getUI(
"ButtonUI", "javax.swing.plaf.basic.BasicButtonUI", this));
-
-
Overrides:
-
updateUI
in class
JComponent
-
-
See Also:
-
JComponent.setUI(javax.swing.plaf.ComponentUI)
,
UIManager.getLookAndFeel()
,
UIManager.getUI(javax.swing.JComponent)
addImpl
protected void addImpl(Component comp,
Object constraints,
int index)
-
Adds the specified component to this container at the specified index, refer to
Container.addImpl(Component, Object, int)
for a complete description of this method.
-
-
Overrides:
-
addImpl
in class
Container
-
-
Parameters:
-
comp - the component to be added
-
constraints - an object expressing layout constraints for this component
-
index - the position in the container's list at which to insert the component, where -1 means append to the end
-
Throws:
-
IllegalArgumentException
- if index is invalid
-
IllegalArgumentException
- if adding the container's parent to itself
-
IllegalArgumentException
- if adding a window to a container
-
Since:
-
1.5
-
See Also:
-
Container.add(Component)
,
Container.add(Component, int)
,
Container.add(Component, java.lang.Object)
,
LayoutManager
,
LayoutManager2
setLayout
public void setLayout(LayoutManager mgr)
-
Sets the layout manager for this container, refer to
Container.setLayout(LayoutManager)
for a complete description of this method.
-
-
Overrides:
-
setLayout
in class
Container
-
-
Parameters:
-
mgr - the specified layout manager
-
Since:
-
1.5
-
See Also:
-
Container.doLayout()
,
Container.getLayout()
addChangeListener
public void addChangeListener(ChangeListener l)
-
Adds a ChangeListener to the button.
-
-
-
Parameters:
-
l - the listener to be added
removeChangeListener
public void removeChangeListener(ChangeListener l)
-
Removes a ChangeListener from the button.
-
-
-
Parameters:
-
l - the listener to be removed
getChangeListeners
public ChangeListener[] getChangeListeners()
-
Returns an array of all the ChangeListeners added to this AbstractButton with addChangeListener().
-
-
-
Returns:
-
all of the ChangeListeners added or an empty array if no listeners have been added
-
Since:
-
1.4
fireStateChanged
protected void fireStateChanged()
-
Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created.
-
-
-
See Also:
-
EventListenerList
addActionListener
public void addActionListener(ActionListener l)
-
Adds an ActionListener to the button.
-
-
-
Parameters:
-
l - the ActionListener to be added
removeActionListener
public void removeActionListener(ActionListener l)
-
Removes an ActionListener from the button. If the listener is the currently set Action for the button, then the Action is set to null.
-
-
-
Parameters:
-
l - the listener to be removed
getActionListeners
public ActionListener[] getActionListeners()
-
Returns an array of all the ActionListeners added to this AbstractButton with addActionListener().
-
-
-
Returns:
-
all of the ActionListeners added or an empty array if no listeners have been added
-
Since:
-
1.4
createChangeListener
protected ChangeListener createChangeListener()
-
Subclasses that want to handle ChangeEvents differently can override this to return another ChangeListener implementation.
-
-
-
Returns:
-
the new ChangeListener
fireActionPerformed
protected void fireActionPerformed(ActionEvent event)
-
Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the event parameter.
-
-
-
Parameters:
-
event - the ActionEvent object
-
See Also:
-
EventListenerList
fireItemStateChanged
protected void fireItemStateChanged(ItemEvent event)
-
Notifies all listeners that have registered interest for notification on this event type. The event instance is lazily created using the event parameter.
-
-
-
Parameters:
-
event - the ItemEvent object
-
See Also:
-
EventListenerList
createActionListener
protected ActionListener createActionListener()
-
-
createItemListener
protected ItemListener createItemListener()
-
-
setEnabled
public void setEnabled(boolean b)
-
Enables (or disables) the button.
-
-
Overrides:
-
setEnabled
in class
JComponent
-
-
Parameters:
-
b - true to enable the button, otherwise false
-
See Also:
-
Component.isEnabled()
,
Component.isLightweight()
getLabel
@Deprecated
public StringgetLabel()
-
Deprecated.
- Replaced by getText
-
Returns the label text.
-
-
-
Returns:
-
a String containing the label
setLabel
@Deprecated
public void setLabel(String label)
-
Deprecated.
- Replaced by setText(text)
-
Sets the label text.
-
-
-
Parameters:
-
label - a String containing the text
addItemListener
public void addItemListener(ItemListener l)
-
Adds an ItemListener to the checkbox.
-
-
Specified by:
-
addItemListener
in interface
ItemSelectable
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Parameters:
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l - the ItemListener to be added
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See Also:
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ItemEvent
removeItemListener
public void removeItemListener(ItemListener l)
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Removes an ItemListener from the button.
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Specified by:
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removeItemListener
in interface
ItemSelectable
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Parameters:
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l - the ItemListener to be removed
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See Also:
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ItemEvent
getItemListeners
public ItemListener[] getItemListeners()
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Returns an array of all the ItemListeners added to this AbstractButton with addItemListener().
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Returns:
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all of the ItemListeners added or an empty array if no listeners have been added
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Since:
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1.4
getSelectedObjects
public Object[] getSelectedObjects()
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Returns an array (length 1) containing the label or null if the button is not selected.
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Specified by:
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getSelectedObjects
in interface
ItemSelectable
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Returns:
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an array containing 1 Object: the text of the button, if the item is selected; otherwise null
init
protected void init(String text,
Icon icon)
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imageUpdate
public boolean imageUpdate(Image img,
int infoflags,
int x,
int y,
int w,
int h)
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This is overridden to return false if the current Icon's Image is not equal to the passed in Image img.
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Specified by:
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imageUpdate
in interface
ImageObserver
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Overrides:
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imageUpdate
in class
Component
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Parameters:
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img - the Image to be compared
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infoflags - flags used to repaint the button when the image is updated and which determine how much is to be painted
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x - the x coordinate
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y - the y coordinate
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w - the width
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h - the height
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Returns:
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false if the infoflags indicate that the image is completely loaded; true otherwise.
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See Also:
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ImageObserver
,
Component.imageUpdate(java.awt.Image, int, int, int, int, int)
paramString
protected String paramString()
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Returns a string representation of this AbstractButton. This method is intended to be used only for debugging purposes, and the content and format of the returned string may vary between implementations. The returned string may be empty but may not be null.
Overriding paramString to provide information about the specific new aspects of the JFC components.
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Overrides:
-
paramString
in class
JComponent
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Returns:
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a string representation of this AbstractButton