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A class that implements this interface receives a preview of keyboard events before they are passed to the focused widget.
KeyboardListener| Method Summary | |
boolean |
onKeyDownPreview(char key,
int modifiers)
Called when a key-down event is received. |
boolean |
onKeyPressPreview(char key,
int modifiers)
Called when a key-press event is received. |
boolean |
onKeyUpPreview(char key,
int modifiers)
Called when a key-up event is received. |
| Method Detail |
public boolean onKeyDownPreview(char key,
int modifiers)
key - the physical key that was depressed. Constants for this value
are defined in this interface with the KEYCODE prefix.modifiers - the modifier keys pressed at when the event occurred. This
value is a combination of the bits defined by
KeyboardListener.MODIFIER_SHIFT,
KeyboardListener.MODIFIER_CTRL, and
KeyboardListener.MODIFIER_ALT.
public boolean onKeyPressPreview(char key,
int modifiers)
key - the Unicode character that was generated by the keyboard action.modifiers - the modifier keys pressed at when the event occurred. This
value is a combination of the bits defined by
KeyboardListener.MODIFIER_SHIFT,
KeyboardListener.MODIFIER_CTRL, and
KeyboardListener.MODIFIER_ALT.
public boolean onKeyUpPreview(char key,
int modifiers)
key - the physical key that was released. Constants for this value are
defined in this interface with the KEYCODE prefix.modifiers - the modifier keys pressed at when the event occurred. This
value is a combination of the bits defined by
KeyboardListener.MODIFIER_SHIFT,
KeyboardListener.MODIFIER_CTRL, and
KeyboardListener.MODIFIER_ALT.
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