The
actionPerformed
event handler is a special user-defined
Function
that can be added to a component when it is created
and that will be called automatically with a single
ActionEvent
argument as described below.
An
actionPerformed
event handler can only be added via
addEventHandler
after a component is created,
but an existing
actionPerformed
event handler can be assigned new values.
Assigning
NULL
to
actionPerformed
disables its functionality until a
NULL
value is assigned to it.
The
actionPerformed
event handler is triggered in the following components under the
circumstances indicated:
| Button |
when the button is pressed
| | Canvas |
when a mouse click occurs
| | JButton |
when the button is pressed
| | JCanvas |
when a mouse click occurs
| | JCheckBox |
when the box is checked or unchecked
| | JCheckBoxMenuItem |
when the menu item is checked or unchecked
| | JFileChooser |
when the buttons within the file chooser are pressed
| | JMenuItem |
when the menu item is selected
| | JRadioButton |
when the button is set or unset
| | JRadioButtonMenuItem |
when the menu item is set or unset
| | JTextCanvas |
when a mouse click occurs
| | JTextField |
when the keyboard key corresponding to key code
yoix.swing.KeyCode.VK_ENTER
is pressed
| | TableColumn |
when a selection is made within the column
| | TextCanvas |
when a mouse click occurs
| | TextField |
when the keyboard key corresponding to key code
yoix.awt.KeyCode.VK_ENTER
is pressed
|
Additionally, components that have a
popup
field for accommodating one of
PopupMenu
or
JPopupMenu
use an
actionPerformed
event handler for menu item selection, in which case the
command
field of the
ActionEvent
contains the text of the selected menu item.
Similarly, components that have a
menubar
field also use the
actionPerformed
event handler for menu item selection.
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| Return: |
none
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| See Also: |
ActionEvent,
addEventHandler,
adjustmentValueChanged,
caretUpdate,
componentHidden,
componentMoved,
componentResized,
componentShown,
dragDropEnd,
dragEnter,
dragExit,
dragGestureRecognized,
dragMouseMoved,
dragOver,
drop,
dropActionChanged,
Event,
focusGained,
focusLost,
hyperlinkActivated,
hyperlinkEntered,
hyperlinkExited,
invocationAction,
invocationBrowse,
invocationChange,
invocationEdit,
invocationEditKey,
invocationRun,
invocationSelection,
itemStateChanged,
keyPressed,
keyReleased,
keyTyped,
mouseClicked,
mouseDragged,
mouseEntered,
mouseExited,
mouseMoved,
mousePressed,
mouseReleased,
mouseWheelMoved,
removeEventHandler,
stateChanged,
textValueChanged,
valueChanged,
windowActivated,
windowClosed,
windowClosing,
windowDeactivated,
windowDeiconified,
windowIconified,
windowOpened
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