Interface HasKeyPreview

public interface HasKeyPreview

A class that implements this interface receives a preview of keyboard events before they are passed to the focused widget.

Methods

onKeyDownPreview(char, int)	Called when a key-down event is received.
onKeyPressPreview(char, int)	Called when a key-press event is received.
onKeyUpPreview(char, int)	Called when a key-up event is received.

public boolean onKeyDownPreview(char key, int modifiers)

Called when a key-down event is received.

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)

Called when a key-press event is received.

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)

Called when a key-up event is received.

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.