xy.reflect.ui.resource.jdk-apidocs.javax.swing.AbstractButton.html Maven / Gradle / Ivy

Defines common behaviors for buttons and menu items.

Buttons can be configured, and to some degree controlled, by Actions. Using an Action with a button has many benefits beyond directly configuring a button. Refer to Swing Components Supporting Action for more details, and you can find more information in How to Use Actions, a section in The Java Tutorial.

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.

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()

setHideActionText

public void setHideActionText(boolean hideActionText)

Sets the hideActionText property, which determines whether the button displays text from the Action. This is useful only if an Action has been installed on the button.

Parameters:

hideActionText - true if the button's text property should not reflect that of the Action; the default is false

Since:

1.6

See Also:

Swing Components Supporting Action

getHideActionText

public boolean getHideActionText()

Returns the value of the hideActionText property, which determines whether the button displays text from the Action. This is useful only if an Action has been installed on the button.

Returns:

true if the button's text property should not reflect that of the Action; the default is false

Since:

1.6

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

Throws:

IllegalArgumentException - if the alignment is not one of the legal values listed above

getHorizontalAlignment

public int getHorizontalAlignment()

Returns the horizontal alignment of the icon and text. AbstractButton's default is SwingConstants.CENTER, but subclasses such as JCheckBox may use a different default.

Returns:

the horizontalAlignment property, one of the following values:

• SwingConstants.RIGHT
• SwingConstants.LEFT
• SwingConstants.CENTER
• SwingConstants.LEADING
• SwingConstants.TRAILING

setHorizontalAlignment

public void setHorizontalAlignment(int alignment)

Sets the horizontal alignment of the icon and text. AbstractButton's default is SwingConstants.CENTER, but subclasses such as JCheckBox may use a different default.

Parameters:

alignment - the alignment value, one of the following values:

• SwingConstants.RIGHT
• SwingConstants.LEFT
• SwingConstants.CENTER
• SwingConstants.LEADING
• SwingConstants.TRAILING

Throws:

IllegalArgumentException - if the alignment is not one of the valid values

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 the key argument is a legal value for the horizontalAlignment and horizontalTextPosition properties. Valid values are:

• SwingConstants.RIGHT
• SwingConstants.LEFT
• SwingConstants.CENTER
• SwingConstants.LEADING
• SwingConstants.TRAILING

Parameters:

key - the property value to check

exception - the message to use in the IllegalArgumentException that is thrown for an invalid value

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)

Verify that the key argument is a legal value for the vertical properties. Valid values are:

• SwingConstants.CENTER
• SwingConstants.TOP
• SwingConstants.BOTTOM

Parameters:

key - the property value to check

exception - the message to use in the IllegalArgumentException that is thrown for an invalid value

Throws:

IllegalArgumentException - if key is not one of the legal values listed above

removeNotify

public void removeNotify()

Notifies this component that it no longer has a parent component. When this method is invoked, any KeyboardActions set up in the the chain of parent components are removed.

Overrides:

removeNotify in class JComponent

Since:

1.6

See Also:

JComponent.registerKeyboardAction(java.awt.event.ActionListener, java.lang.String, javax.swing.KeyStroke, int)

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. 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.

Setting the Action results in immediately changing all the properties described in Swing Components Supporting Action. Subsequently, the button's properties are automatically updated as the Action's properties change.

This method uses three other methods to set and help track the Action's property values. It uses the configurePropertiesFromAction method to immediately change the button's properties. To track changes in the Action's property values, this method registers the PropertyChangeListener returned by createActionPropertyChangeListener. The default PropertyChangeListener invokes the actionPropertyChanged method when a property in the Action changes.

Parameters:

a - the Action for the AbstractButton, or null

Since:

1.3

See Also:

Action, getAction(), configurePropertiesFromAction(javax.swing.Action), createActionPropertyChangeListener(javax.swing.Action), actionPropertyChanged(javax.swing.Action, java.lang.String)

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)

Sets the properties on this button to match those in the specified Action. Refer to Swing Components Supporting Action for more details as to which properties this sets.

Parameters:

a - the Action from which to get the properties, or null

Since:

1.3

See Also:

Action, setAction(javax.swing.Action)

actionPropertyChanged

protected void actionPropertyChanged(Action action,
                                     String propertyName)

Updates the button's state in response to property changes in the associated action. This method is invoked from the PropertyChangeListener returned from createActionPropertyChangeListener. Subclasses do not normally need to invoke this. Subclasses that support additional Action properties should override this and configurePropertiesFromAction.

Refer to the table at Swing Components Supporting Action for a list of the properties this method sets.

Parameters:

action - the Action associated with this button

propertyName - the name of the property that changed

Since:

1.6

See Also:

Action, configurePropertiesFromAction(javax.swing.Action)

createActionPropertyChangeListener

protected PropertyChangeListener createActionPropertyChangeListener(Action a)

Creates and returns a PropertyChangeListener that is responsible for listening for changes from the specified Action and updating the appropriate properties.

Warning: If you subclass this do not create an anonymous inner class. If you do the lifetime of the button will be tied to that of the Action.

Parameters:

a - the button's action

Since:

1.3

See Also:

Actions, 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 As', 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 String getLabel()

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

Parameters:

l - the ItemListener to be added

See Also:

ItemEvent

removeItemListener

public void removeItemListener(ItemListener l)

Removes an ItemListener from the button.

Specified by:

removeItemListener in interface ItemSelectable

Parameters:

l - the ItemListener to be removed

See Also:

ItemEvent

getItemListeners

public ItemListener[] getItemListeners()

Returns an array of all the ItemListeners added to this AbstractButton with addItemListener().

Returns:

all of the ItemListeners added or an empty array if no listeners have been added

Since:

1.4

getSelectedObjects

public Object[] getSelectedObjects()

Returns an array (length 1) containing the label or null if the button is not selected.

Specified by:

getSelectedObjects in interface ItemSelectable

Returns:

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)

imageUpdate

public 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.

Specified by:

imageUpdate in interface ImageObserver

Overrides:

imageUpdate in class Component

Parameters:

img - the Image to be compared

infoflags - flags used to repaint the button when the image is updated and which determine how much is to be painted

x - the x coordinate

y - the y coordinate

w - the width

h - the height

Returns:

false if the infoflags indicate that the image is completely loaded; true otherwise.

See Also:

ImageObserver, Component.imageUpdate(java.awt.Image, int, int, int, int, int)

paramString

protected String paramString()

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.

Overrides:

paramString in class JComponent

Returns:

a string representation of this AbstractButton