下面列出了怎么用org.eclipse.swt.widgets.Listener的API类实例代码及写法，或者点击链接到github查看源代码。
private CursorLinePainter getCursorLinePainterInstalled(TextViewer viewer)
{
Listener[] listeners = viewer.getTextWidget().getListeners(3001/* StyledText.LineGetBackground */);
for (Listener listener : listeners)
{
if (listener instanceof TypedListener)
{
TypedListener typedListener = (TypedListener) listener;
if (typedListener.getEventListener() instanceof CursorLinePainter)
{
return (CursorLinePainter) typedListener.getEventListener();
}
}
}
return null;
}
private void createExpressionButton( Composite parent, final Text text )
{
Listener listener = new Listener( ) {
public void handleEvent( Event event )
{
updateButtons( );
}
};
ExpressionButtonUtil.createExpressionButton( parent,
text,
getExpressionProvider( ),
inputHandle.getElementHandle( ),
listener );
}
private void addMouseDownListener() {
addListener(SWT.MouseDown, new Listener() {
@Override
public void handleEvent(final Event event) {
for (final BreadcrumbItem item : Breadcrumb.this.items) {
if (item.getBounds().contains(event.x, event.y)) {
final boolean isToggle = (item.getStyle() & SWT.TOGGLE) != 0;
final boolean isPush = (item.getStyle() & SWT.PUSH) != 0;
if (isToggle || isPush) {
item.setSelection(!item.getSelection());
redraw();
update();
}
item.setData(IS_BUTTON_PRESSED, "*");
return;
}
}
}
});
}
private void renderTransparency(final Shell shell) {
Group group = new Group(shell, SWT.NONE);
group.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false, 6, 1));
group.setLayout(new GridLayout(1, false));
group.setText("Transparency");
final Scale transparencySlider = new Scale(group, SWT.HORIZONTAL);
transparencySlider.setMinimum(20);
transparencySlider.setMaximum(100);
transparencySlider.setPageIncrement(90);
transparencySlider.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
transparencySlider.setSelection(100);
transparencySlider.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
shell.setAlpha(255 * transparencySlider.getSelection() / 100);
}
});
}
private CCombo createSubprocessSourceCombo(final Composite outputMappingControl, final OutputMapping mapping) {
final CCombo subprocessSourceCombo = getWidgetFactory().createCCombo(outputMappingControl, SWT.BORDER);
for (final Data subprocessData : callActivityHelper.getCallActivityData()) {
subprocessSourceCombo.add(subprocessData.getName());
}
subprocessSourceCombo.setLayoutData(GridDataFactory.fillDefaults().grab(true, false).indent(15, 0).create());
subprocessSourceCombo.addListener(SWT.Modify, new Listener() {
@Override
public void handleEvent(final Event event) {
getEditingDomain().getCommandStack()
.execute(
new SetCommand(getEditingDomain(), mapping,
ProcessPackage.Literals.OUTPUT_MAPPING__SUBPROCESS_SOURCE, subprocessSourceCombo
.getText()));
}
});
if (mapping.getSubprocessSource() != null) {
subprocessSourceCombo.setText(mapping.getSubprocessSource());
}
return subprocessSourceCombo;
}
/**
* Creates an inplace tooltip.
*
* @param parent parent control.
*/
public GridToolTip(final Control parent)
{
super(parent, SWT.NONE);
shell = new Shell(parent.getShell(), SWT.NO_TRIM | SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
shell.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
shell.setForeground(shell.getDisplay().getSystemColor(SWT.COLOR_INFO_FOREGROUND));
parent.addListener(SWT.Dispose, new Listener()
{
public void handleEvent(Event arg0)
{
shell.dispose();
dispose();
}
});
shell.addListener(SWT.Paint, new Listener()
{
public void handleEvent(Event e)
{
onPaint(e.gc);
}
});
}
public ObservableCombo(Composite parent, GridData gridData) {
Composite container = new Composite(parent, SWT.NONE);
container.setLayout(new GridLayout(2, false));
combo = new Combo(container, SWT.READ_ONLY);
combo.setLayoutData(gridData);
combo.addSelectionListener(new SelectionAdapter() {
@Override
public void widgetSelected(SelectionEvent e) {
notifyObservers();
}
});
Button refresh = new Button(container, SWT.PUSH);
refresh.setText("Refresh");
refresh.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
updateOptionsDisplay();
}
});
}
/**
* @return a listener for the FocusOut event
*/
private Listener createFocusOutListener() {
return new Listener() {
@Override
public void handleEvent(final Event event) {
/*
* Async is needed to wait until focus reaches its new Control
*/
TextAssist.this.getDisplay().asyncExec(() -> {
if (TextAssist.this.isDisposed() || TextAssist.this.getDisplay().isDisposed()) {
return;
}
final Control control = TextAssist.this.getDisplay().getFocusControl();
if (control == null || control != text && control != table) {
popup.setVisible(false);
}
});
}
};
}
public void createContent( Composite parent )
{
controlTypeChooser = new Combo( parent, SWT.READ_ONLY | SWT.DROP_DOWN );
controlTypeChooser.setVisibleItemCount( 30 );
controlTypeChooser.addListener( SWT.Selection, new Listener( ) {
public void handleEvent( Event e )
{
List<Listener> listeners = DefaultParameterDialogControlTypeHelper.this.listeners.get( SWT.Selection );
if ( listeners == null )
return;
for ( int i = 0; i < listeners.size( ); i++ )
listeners.get( i ).handleEvent( e );
}
} );
}
/**
* Initialises this dialog's viewer after it has been laid out.
*/
private void initContent() {
listViewer.setInput(inputElement);
Listener listener = new Listener() {
@Override
public void handleEvent(Event e) {
if (updateInThread) {
if (filterJob != null) {
// cancel it if it was already in progress
filterJob.cancel();
}
filterJob = new FilterJob();
filterJob.start();
} else {
doFilterUpdate(new NullProgressMonitor());
}
}
};
filterPatternField.setText(filterPattern != null ? filterPattern : "");
filterPatternField.addListener(SWT.Modify, listener);
}
@Override
protected List<Control> renderControls() {
List<Control> controls = new LinkedList<>();
for (String choice : question.getChoices()) {
Button btn = new Button(root, SWT.RADIO);
btn.setText(choice);
btn.setSelection(choice.equals(question.getAnswer(document)));
btn.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
question.addAnswer(document, choice);
onQuestionChanged.accept(question);
}
});
controls.add(btn);
}
return controls;
}
public void addAndReorderListener(int eventType, Listener listener){
//have to 'reorder' listeners in eventTable. BidiLayout's listener should come first (before StyledText's one)
Listener[] listeners = styledText.getListeners(eventType);
Listener styledTextListener = null;
for (Listener listener2 : listeners) {
if (listener2.getClass().getSimpleName().startsWith("StyledText")){
styledTextListener = listener2;
break;
}
}
if (styledTextListener != null){
styledText.removeListener(eventType, styledTextListener);
}
styledText.addListener(eventType, listener);
if (styledTextListener != null){
styledText.addListener(eventType, styledTextListener);
}
}
/**
* Loads an image. Adds a dispose listener that disposes the image when the display is disposed
* @param display
* @param resource
* @return
*/
private static final Image getImage(Display display, String resource) {
InputStream stream = Resources.class.getResourceAsStream(resource);
try {
final Image image = new Image(display, stream);
display.addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event arg0) {
if (image != null && !image.isDisposed()) {
image.dispose();
}
}
});
return image;
} finally {
if (stream != null) {
try {
stream.close();
} catch (IOException e) {
// Ignore silently
}
}
}
}
private void attachListeners() {
listener = new Listener() {
public void handleEvent(Event event) {
switch (event.type) {
case SWT.Paint:
onPaint(event);
break;
case SWT.MouseDown:
onMouseDown(event);
break;
case SWT.MouseEnter:
BubbleRegistrant registrant = BubbleRegistry.getInstance().findRegistrant(getPoppedOverItem().getControlOrCustomElement());
registrant.dismissBubble();
registrant.bubble.setDisableAutoHide(false);
break;
default:
break;
}
}
};
popOverShell.addListener(SWT.Paint, listener);
popOverShell.addListener(SWT.MouseDown, listener);
popOverShell.addListener(SWT.MouseEnter, listener);
addAccessibilityHooks(parentControl);
}
/**
* Creates an inplace tooltip.
*
* @param parent parent control.
*/
public GridToolTip(final Control parent)
{
super(parent, SWT.NONE);
shell = new Shell(parent.getShell(), SWT.NO_TRIM | SWT.ON_TOP | SWT.NO_FOCUS | SWT.TOOL);
shell.setBackground(shell.getDisplay().getSystemColor(SWT.COLOR_INFO_BACKGROUND));
shell.setForeground(shell.getDisplay().getSystemColor(SWT.COLOR_INFO_FOREGROUND));
parent.addListener(SWT.Dispose, new Listener()
{
public void handleEvent(Event arg0)
{
shell.dispose();
dispose();
}
});
shell.addListener(SWT.Paint, new Listener()
{
public void handleEvent(Event e)
{
onPaint(e.gc);
}
});
}
public void testDisposeWithListeners() throws Exception {
asyncExec(new Runnable() {
public void run() {
comp.addListener(SWT.Dispose, new Listener() {
public void handleEvent(Event event) {
assertFalse(comp.isDisposed());
}
});
}
});
asyncExec(new Runnable() {
public void run() {
getShell().dispose();
}
});
while(getDisplay() != null && !getDisplay().isDisposed()) {
Thread.sleep(100);
}
}
@SuppressWarnings("unchecked")
public void addChild(UIControl control) {
Control handle = ((SWTControl<? extends Control>) control).getControl();
this.control = control;
this.item.setControl(handle);
handle.addListener(SWT.Resize, new Listener() {
public void handleEvent(Event event) {
onResize();
}
});
handle.getDisplay().asyncExec(new Runnable() {
public void run() {
onResize();
}
});
}
public MatchViewerBodyMenu(MatchViewPart view) {
this.view = view;
createMenu();
bodyMenu.addListener(SWT.Show, new Listener() {
public void handleEvent(Event event) {
updateActionState();
}
});
}
@Override
protected Control createMessageArea(Composite composite) {
// prevent creation of messageLabel by super implementation
String linkText = message;
message = null;
super.createMessageArea(composite);
message = linkText;
Link messageLink = new Link(composite, SWT.WRAP);
messageLink.setText(message);
GridDataFactory.fillDefaults().align(SWT.FILL, SWT.CENTER)
.grab(true, false).applyTo(messageLink);
messageLink.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
Shell shell = PlatformUI.getWorkbench()
.getActiveWorkbenchWindow().getShell();
PreferenceDialog pref = PreferencesUtil
.createPreferenceDialogOn(shell,
"org.eclipse.gef.dot.internal.ui.GraphvizPreferencePage", //$NON-NLS-1$
null, null);
if (pref != null) {
close();
pref.open();
}
}
});
return composite;
}
/**
* Remove selection listener
* @param listener A listener to remove
*/
public void removeSelectionListener(Listener listener) {
checkWidget();
if (listener == null) {
SWT.error (SWT.ERROR_NULL_ARGUMENT);
}
removeListener(SWT.Selection, listener);
}
private Button createUpdateConnectorButton(final Composite parent) {
final Button updateButton = getWidgetFactory().createButton(parent,
Messages.update, SWT.FLAT);
updateButton.setLayoutData(GridDataFactory.fillDefaults()
.minSize(IDialogConstants.BUTTON_WIDTH, SWT.DEFAULT).create());
updateButton.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(final Event event) {
updateConnectorAction();
}
});
return updateButton;
}
@Override
protected Control createDialogArea(Composite parent) {
Composite composite = (Composite) super.createDialogArea(parent);
Link messageLnk = new Link(composite,SWT.NONE);
messageLnk.setText(this.message);
messageLnk.addListener(SWT.Selection, new Listener() {
@Override
public void handleEvent(Event event) {
OpenCheatSheetAction ch = new OpenCheatSheetAction("org.eclipse.thym.ui.requirements.cordova");
ch.run();
}
});
return composite;
}
public static void main(String[] args) {
// Create the Vulkan instance
VkInstance instance = createInstance();
// Create SWT Display, Shell and VKCanvas
final Display display = new Display();
final Shell shell = new Shell(display, SWT.SHELL_TRIM | SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE);
shell.setLayout(new FillLayout());
shell.addListener(SWT.Traverse, new Listener() {
public void handleEvent(Event event) {
switch (event.detail) {
case SWT.TRAVERSE_ESCAPE:
shell.close();
event.detail = SWT.TRAVERSE_NONE;
event.doit = false;
break;
}
}
});
VKData data = new VKData();
data.instance = instance; // <- set Vulkan instance
final VKCanvas canvas = new VKCanvas(shell, SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE, data);
shell.setSize(800, 600);
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch())
display.sleep();
}
canvas.dispose();
display.dispose();
}
/**
*
*/
private void init( )
{
this.setSize( getParent( ).getClientArea( ).width,
getParent( ).getClientArea( ).height );
vListeners = new Vector<Listener>( );
}
public DateTimeDataElementComposite( Composite parent, int style,
DateTimeDataElement data, boolean isNullAllowed )
{
super( parent, SWT.NONE );
this.isNullAllowed = isNullAllowed;
placeComponents( style );
vListeners = new Vector<Listener>( );
setDataElement( data );
}
private void addMouseUpListener() {
addListener(SWT.MouseUp, new Listener() {
@Override
public void handleEvent(final Event event) {
for (final BreadcrumbItem item : Breadcrumb.this.items) {
if (item.getBounds().contains(event.x, event.y)) {
if (item.getData(IS_BUTTON_PRESSED) == null) {
// The button was not pressed
return;
}
item.setData(IS_BUTTON_PRESSED, null);
if ((item.getStyle() & SWT.PUSH) != 0) {
item.setSelection(false);
}
if ((item.getStyle() & (SWT.TOGGLE | SWT.PUSH)) != 0) {
item.fireSelectionEvent();
redraw();
update();
}
return;
}
}
}
});
}
private void createRow(final Composite parent, Composite panel,
final Text text) {
text.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
Button button = new Button(panel, SWT.BORDER);
button.setText("Browse...");
button.addListener(SWT.Selection, new Listener() {
public void handleEvent(Event arg0) {
try {
AST ast = AST.newAST(3);
SelectionDialog dialog = JavaUI.createTypeDialog(parent.getShell(),
new ProgressMonitorDialog(parent.getShell()), SearchEngine
.createWorkspaceScope(),
IJavaElementSearchConstants.CONSIDER_CLASSES, false);
dialog.setMessage("Select Mapper type (implementing )");
dialog.setBlockOnOpen(true);
dialog.setTitle("Select Mapper Type");
dialog.open();
if ((dialog.getReturnCode() == Window.OK)
&& (dialog.getResult().length > 0)) {
IType type = (IType) dialog.getResult()[0];
text.setText(type.getFullyQualifiedName());
setDirty(true);
}
} catch (JavaModelException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
});
}
/** {@inheritDoc} */
public void setEditingSupport(EditingSupport editingSupport)
{
currentEditingSupport = editingSupport;
if (!getColumn().isVisible()) {
return;
}
if (editingSupport instanceof CheckEditingSupport)
{
if (checkEditingSupport == null)
{
final int colIndex = getColumn().getParent().indexOf(getColumn());
getColumn().getParent().addListener(SWT.Selection, new Listener()
{
public void handleEvent(Event event)
{
if (event.detail == SWT.CHECK && event.index == colIndex)
{
GridItem item = (GridItem)event.item;
Object element = item.getData();
checkEditingSupport.setValue(element, new Boolean(item.getChecked(colIndex)));
}
}
});
}
checkEditingSupport = (CheckEditingSupport)editingSupport;
}
else
{
super.setEditingSupport(editingSupport);
}
}
/**
* creates a ComboVar populated with fields from the previous step.
* @param parentComposite - the composite in which the widget will be placed
* @param props - PropsUI props for L&F
* @param stepMeta - stepMeta of the current step
* @param formData - FormData to use for placement
*/
public static ComboVar createFieldDropDown(
Composite parentComposite, PropsUI props, BaseStepMeta stepMeta, FormData formData ) {
TransMeta transMeta = stepMeta.getParentStepMeta().getParentTransMeta();
ComboVar fieldDropDownCombo = new ComboVar( transMeta, parentComposite, SWT.SINGLE | SWT.LEFT | SWT.BORDER );
props.setLook( fieldDropDownCombo );
fieldDropDownCombo.addModifyListener( e -> stepMeta.setChanged() );
fieldDropDownCombo.setLayoutData( formData );
Listener focusListener = e -> {
String current = fieldDropDownCombo.getText();
fieldDropDownCombo.getCComboWidget().removeAll();
fieldDropDownCombo.setText( current );
try {
RowMetaInterface rmi = transMeta.getPrevStepFields( stepMeta.getParentStepMeta().getName() );
List ls = rmi.getValueMetaList();
for ( Object l : ls ) {
ValueMetaBase vmb = (ValueMetaBase) l;
fieldDropDownCombo.add( vmb.getName() );
}
} catch ( KettleStepException ex ) {
// can be ignored, since previous step may not be set yet.
stepMeta.logDebug( ex.getMessage(), ex );
}
};
fieldDropDownCombo.getCComboWidget().addListener( SWT.FocusIn, focusListener );
return fieldDropDownCombo;
}
/**
* Creates and initializes the tree viewer.
*
* @param parent
* the parent composite
* @return the tree viewer
* @see #doCreateTreeViewer(Composite, int)
*/
protected TreeViewer createTreeViewer( Composite parent )
{
TreeViewer treeViewer = super.createTreeViewer( parent );
Tree tree = treeViewer.getTree( );
assert ( tree != null );
for ( int i = 0; i < listeners.size( ); i++ )
{
int type = listeners.get( i ).type;
Listener listener = listeners.get( i ).listener;
tree.addListener( type, listener );
}
return treeViewer;
}