javax.swing
Interface ButtonModel

All Superinterfaces:

ItemSelectable

All Known Implementing Classes:

DefaultButtonModel

public interface ButtonModel

extends ItemSelectable

State Model for buttons. This model is used for check boxes and radio buttons, which are special kinds of buttons, as well as for normal buttons. For check boxes and radio buttons, pressing the mouse selects the button. For normal buttons, pressing the mouse "arms" the button. Releasing the mouse over the button then initiates a button press, firing its action event. Releasing the mouse elsewhere disarms the button.

In use, a UI will invoke setSelected(boolean) when a mouse click occurs over a check box or radio button. It will invoke setArmed(boolean) when the mouse is pressed over a regular button and invoke setPressed(boolean) when the mouse is released. If the mouse travels outside the button in the meantime, setArmed(false) will tell the button not to fire when it sees setPressed. (If the mouse travels back in, the button will be rearmed.)

Note:
A button is triggered when it is both "armed" and "pressed".

Author:

Jeff Dinkins

Method Summary

void	addActionListener(ActionListener l) Adds an ActionListener to the button.
void	addChangeListener(ChangeListener l) Adds a ChangeListener to the button.
void	addItemListener(ItemListener l) Adds an ItemListener to the button.
String	getActionCommand() Returns the action command for this button.
int	getMnemonic() Gets the keyboard mnemonic for this model
boolean	isArmed() Indicates partial commitment towards pressing the button.
boolean	isEnabled() Indicates if the button can be selected or pressed by an input device (such as a mouse pointer).
boolean	isPressed() Indicates if button has been pressed.
boolean	isRollover() Indicates that the mouse is over the button.
boolean	isSelected() Indicates if the button has been selected.
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	setActionCommand(String s) Sets the actionCommand string that gets sent as part of the event when the button is pressed.
void	setArmed(boolean b) Marks the button as "armed".
void	setEnabled(boolean b) Enables or disables the button.
void	setGroup(ButtonGroup group) Identifies the group this button belongs to -- needed for radio buttons, which are mutually exclusive within their group.
void	setMnemonic(int key) Sets the keyboard mnemonic (shortcut key or accelerator key) for this button.
void	setPressed(boolean b) Sets the button to pressed or unpressed.
void	setRollover(boolean b) Sets or clears the button's rollover state
void	setSelected(boolean b) Selects or deselects the button.

Methods inherited from interface java.awt.ItemSelectable

getSelectedObjects

Method Detail

isArmed

public boolean isArmed()

Indicates partial commitment towards pressing the button.

Returns:

true if the button is armed, and ready to be pressed

See Also:

setArmed(boolean)

isSelected

public boolean isSelected()

Indicates if the button has been selected. Only needed for certain types of buttons - such as radio buttons and check boxes.

Returns:

true if the button is selected

isEnabled

public boolean isEnabled()

Indicates if the button can be selected or pressed by an input device (such as a mouse pointer). (Check boxes are selected, regular buttons are "pressed".)

Returns:

true if the button is enabled, and therefore selectable (or pressable)

isPressed

public boolean isPressed()

Indicates if button has been pressed.

Returns:

true if the button has been pressed

isRollover

public boolean isRollover()

Indicates that the mouse is over the button.

Returns:

true if the mouse is over the button

setArmed

public void setArmed(boolean b)

Marks the button as "armed". If the mouse button is released while it is over this item, the button's action event fires. If the mouse button is released elsewhere, the event does not fire and the button is disarmed.

Parameters:

b - true to arm the button so it can be selected

setSelected

public void setSelected(boolean b)

Selects or deselects the button.

Parameters:

b - true selects the button, false deselects the button.

setEnabled

public void setEnabled(boolean b)

Enables or disables the button.

Parameters:

b - true to enable the button

See Also:

isEnabled()

setPressed

public void setPressed(boolean b)

Sets the button to pressed or unpressed.

Parameters:

b - true to set the button to "pressed"

See Also:

isPressed()

setRollover

public void setRollover(boolean b)

Sets or clears the button's rollover state

Parameters:

b - true to turn on rollover

See Also:

isRollover()

setMnemonic

public void setMnemonic(int key)

Sets the keyboard mnemonic (shortcut key or accelerator key) for this button.

Parameters:

key - an int specifying the accelerator key

getMnemonic

public int getMnemonic()

Gets the keyboard mnemonic for this model

Returns:

an int specifying the accelerator key

See Also:

setMnemonic(int)

setActionCommand

public void setActionCommand(String s)

Sets the actionCommand string that gets sent as part of the event when the button is pressed.

Parameters:

s - the String that identifies the generated event

getActionCommand

public String getActionCommand()

Returns the action command for this button.

Returns:

the String that identifies the generated event

See Also:

setActionCommand(java.lang.String)

setGroup

public void setGroup(ButtonGroup group)

Identifies the group this button belongs to -- needed for radio buttons, which are mutually exclusive within their group.

Parameters:

group - the ButtonGroup this button belongs to

addActionListener

public void addActionListener(ActionListener l)

Adds an ActionListener to the button.

Parameters:

l - the listener to add

removeActionListener

public void removeActionListener(ActionListener l)

Removes an ActionListener from the button.

Parameters:

l - the listener to remove

addItemListener

public void addItemListener(ItemListener l)

Adds an ItemListener to the button.

Specified by:

addItemListener in interface ItemSelectable

Parameters:

l - the listener to add

See Also:

ItemEvent

removeItemListener

public void removeItemListener(ItemListener l)

Removes an ItemListener from the button.

Specified by:

removeItemListener in interface ItemSelectable

Parameters:

l - the listener to remove

See Also:

ItemEvent

addChangeListener

public void addChangeListener(ChangeListener l)

Adds a ChangeListener to the button.

Parameters:

l - the listener to add

removeChangeListener

public void removeChangeListener(ChangeListener l)

Removes a ChangeListener from the button.

Parameters:

l - the listener to remove