When a key listener is added to a control, the control will take part in widget traversal. By default, all traversal keys (such as the tab key and so on) are delivered to the control. In order for a control to take part in traversal, it should listen for traversal events. Otherwise, the user can traverse into a control but not out. Note that native controls such as table and tree implement key traversal in the operating system. It is not necessary to add traversal listeners for these controls, unless you want to override the default traversal.
KeyListener, TraverseListener, Sample code and further information
| Modifier and Type | Field and Description |
|---|---|
| public char | |
| public boolean | doit
A flag indicating whether the operation should be allowed. |
| public int | |
| public int | keyLocation
depending on the event, the location of key specified by the keyCode or character. |
| pack-priv static final long | |
| public int | stateMask
the state of the keyboard modifier keys and mouse masks at the time the event was generated. |
| Access | Constructor and Description |
|---|---|
| public |
| Modifier and Type | Method and Description |
|---|---|
| public String | Returns: a string representation of the eventOverrides org. |
| character | back to summary |
|---|---|
public char character
| |
| doit | back to summary |
|---|---|
| public boolean doit A flag indicating whether the operation should be allowed.
Setting this field to | |
| keyCode | back to summary |
|---|---|
public int keyCode
| |
| keyLocation | back to summary |
|---|---|
| public int keyLocation depending on the event, the location of key specified by the
keyCode or character. The possible values for this field are
The location field can be used to differentiate key events that have the same key code and character but are generated by different keys on the keyboard. For example, a key down event with the key code equal to SWT.SHIFT can be generated by the left and the right shift keys on the keyboard. The location field can only be used to determine the location of the key code or character in the current event. It does not include information about the location of modifiers in the state mask.
| |
| serialVersionUID | back to summary |
|---|---|
| pack-priv static final long serialVersionUID | |
| stateMask | back to summary |
|---|---|
| public int stateMask the state of the keyboard modifier keys and mouse masks at the time the event was generated. | |
| KeyEvent | back to summary |
|---|---|
| public KeyEvent(Event e) Constructs a new instance of this class based on the information in the given untyped event.
| |
| toString | back to summary |
|---|---|
| public String toString() Overrides org. Returns a string containing a concise, human-readable description of the receiver. | |