lambda-ui

A lambda driven UI creation collection with support for Eclipse SWT, JFace, Databinding to help to reduce/eliminate boilerplate UI code.

SWT sample

Conventional UI code:

private Text text;

public void createUIConventional(Composite parent) {
	parent.setLayout(GridLayoutFactory.swtDefaults().numColumns(3).create());

	Label label = new Label(parent, SWT.NONE);
	label.setText("Selection");

	ComboViewer viewer = new ComboViewer(parent, SWT.BORDER | SWT.SINGLE | SWT.READ_ONLY);
	customizeComboViewer(viewer);
	viewer.getCombo().setLayoutData(new GridData(GridData.FILL_HORIZONTAL));

	Button button = new Button(parent, SWT.NONE);
	button.setText("Apply");
	button.addSelectionListener(new SelectionAdapter() {
		@Override
		public void widgetSelected(SelectionEvent e) {
			text.setText("Selection:  " + viewer.getCombo().getText());
		}
	});

	text = new Text(parent, SWT.READ_ONLY | SWT.BORDER);
	text.setLayoutData(
			GridDataFactory.swtDefaults().span(3, 1).grab(true, true).align(SWT.FILL, SWT.FILL).create());
}

With lambda support:

private SwtUI<Composite> root;

public void createUI(Composite parent) {
	root = SwtUI.wrap(parent);
	root.layout(GridLayoutFactory.swtDefaults().numColumns(3).create())//
			.child(() -> SwtUI.create(Label::new)//
					.text("Selection"))//
			.child(() -> ViewerUI.createViewer(ComboViewer::new, SWT.BORDER | SWT.SINGLE | SWT.READ_ONLY)//
					.id("selectionCombo")//
					.customizeViewer(this::customizeComboViewer)//
					.layoutData(new GridData(GridData.FILL_HORIZONTAL)))//
			.child(() -> SwtUI.create(Button::new)//
					.text("Apply")//
					.on(SWT.Selection, this::onButtonClick))//
			.child(() -> SwtUI.create(Text::new, SWT.READ_ONLY | SWT.BORDER)//
					.id("textField")//
					.layoutData(GridDataFactory.swtDefaults().span(3, 1).grab(true, true).align(SWT.FILL, SWT.FILL)
							.create()));
}

private void onButtonClick(Event evt) {
	Text tf = root.find("textField");
	ComboViewer viewer = root.findViewer("selectionCombo");
	tf.setText("Selection: " + viewer.getCombo().getText());
}

Both samples produce the following same output:

Databinding

A sub class (a bit enhanced) of the Eclipse XWT binding expressions are supported:

public void createUI(SwtUI<Composite> root) {
	Person person = new Person();
	person.setFirstName("John");
	person.setLastName("Doe");
	root.bindingMaster(person);

	root.layout(GridLayoutFactory.swtDefaults().numColumns(2).create())//
			.child(() -> SwtUI.create(Label::new)//
					.text("First Name"))//
			.child(() -> SwtUI.create(Text::new, SWT.BORDER)//
					.layoutData(new GridData(GridData.FILL_HORIZONTAL))//
					.text(SWT.Modify, "{Binding path=firstName, delay=200}"))//
			.child(() -> SwtUI.create(Label::new)//
					.text("Last Name"))//
			.child(() -> SwtUI.create(Text::new, SWT.BORDER)//
					.layoutData(new GridData(GridData.FILL_HORIZONTAL))//
					.text(SWT.Modify, "{path=lastName, delay=200}"))//
			.child(() -> SwtUI.create(Label::new)//
					.text("Complete Name"))//
			.child(() -> SwtUI.create(Text::new, SWT.BORDER)//
					.layoutData(new GridData(GridData.FILL_HORIZONTAL))//
					.text("Name: {path=firstName} {path=lastName}")//
	);
}

Databinding Features (supported at the moment)

• Simple property value bindings
• multi bindings
• auto-conversion of values (from/to)
• delayed widget properties bindings

Binding expressions

Examples:

• "{Binding path=beanPropertyName, delay=200}": binds the property of the widget to the bean property called 'beanPropertyName', when a two-way-binding is set (default), changes from the widget to the bean are transferred delayed (200 ms here)

• "{path=beanPropertyName, delay=200}": same as above, but shortened as the 'Binding' qualifier of the expression is optional

• "Name: {path=firstName} {path=lastName}": a computed/multi binding which will be automatically constructed using both props called firstName and lastName