The AbstractButton Class
AbstractButton is an abstract base class for all button components
(JButton, JToggleButton, JCheckBox, JRadioButton, and JMenuItem and its subclasses). Since it
provides functionality common to all types of buttons, we’ll cover it
here before getting to the concrete button classes.
AbstractButton provides much of
the functionality associated with the interaction between the various
concrete button classes and their ButtonModel objects. As we mentioned earlier,
buttons in Swing can be made up of an image (Icon ), text, or both. The relative positions of the text and icon
are specified exactly as they are with the JLabel class.
Image buttons may specify as many as seven different
images, allowing the button to be displayed differently depending on its
current state. The seven icons are described in Table 5-5, with the other
properties defined by AbstractButton.
Properties
The AbstractButton class
defines the properties shown in Table 5-5.
Table 5-5. AbstractButton properties
Property | Data type | get | is | set | Default value |
|---|---|---|---|---|---|
action1.3 | Action | · | · | null | |
actionCommand | String | · | · | null | |
borderPaintedb | boolean | · | · | true | |
contentAreaFilledb | boolean | · | · | true | |
disabledIconb | Icon | · | · | null | |
disabledSelectedIconb | Icon | · | · | null | |
displayedMnemonicIndex1.4 | int | · | · | -1 | |
enabledo | boolean | · | · | true | |
focusPaintedb | boolean | · | · | true | |
horizontalAlignmentb | int | · | · | CENTER | |
horizontalTextPositionb | int | · | · | TRAILING1.4 | |
iconb | Icon | · | · | null | |
iconTextGap1.4 | int | · | · | 4 | |
labeld | String | · | · | Same as | |
marginb | Insets | · | · | null | |
mnemonicb | int | · | · | KeyEvent.VK_UNDEFINED ... |
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