Examples of org.eclipse.swt.layout.FormLayout

org.eclipse.swt.layout.FormLayout
Instances of this class control the position and size of the children of a composite control by using FormAttachments to optionally configure the left, top, right and bottom edges of each child.
The following example code creates a FormLayout and then sets it into a Shell:
```
 Display display = new Display (); Shell shell = new Shell(display); FormLayout layout = new FormLayout(); layout.marginWidth = 3; layout.marginHeight = 3; shell.setLayout(layout); 
```
To use a FormLayout, create a FormData with FormAttachment for each child of Composite. The following example code attaches button1 to the top and left edge of the composite and button2 to the right edge of button1 and the top and right edges of the composite:
```
 FormData data1 = new FormData(); data1.left = new FormAttachment(0, 0); data1.top = new FormAttachment(0, 0); button1.setLayoutData(data1); FormData data2 = new FormData(); data2.left = new FormAttachment(button1); data2.top = new FormAttachment(0, 0); data2.right = new FormAttachment(100, 0); button2.setLayoutData(data2); 
```
Each side of a child control can be attached to a position in the parent composite, or to other controls within the Composite by creating instances of FormAttachment and setting them into the top, bottom, left, and right fields of the child's FormData.

If a side is not given an attachment, it is defined as not being attached to anything, causing the child to remain at its preferred size. If a child is given no attachment on either the left or the right or top or bottom, it is automatically attached to the left and top of the composite respectively. The following code positions button1 and button2 but relies on default attachments:
```
 FormData data2 = new FormData(); data2.left = new FormAttachment(button1); data2.right = new FormAttachment(100, 0); button2.setLayoutData(data2); 
```
IMPORTANT: Do not define circular attachments. For example, do not attach the right edge of button1 to the left edge of button2 and then attach the left edge of button2 to the right edge of button1. This will over constrain the layout, causing undefined behavior. The algorithm will terminate, but the results are undefined.
@see FormData @see FormAttachment @since 2.0

     */
    public void createControl(Composite parent) {
        widgetFactory = new FeaturePanelWidgetFactory();
        tabbedPropertyComposite = new FeaturePanelComposite(parent, widgetFactory, hasTitleBar);
        widgetFactory.paintBordersFor(tabbedPropertyComposite);
        tabbedPropertyComposite.setLayout(new FormLayout());
        FormData formData = new FormData();
        formData.left = new FormAttachment(0, 0);
        formData.right = new FormAttachment(100, 0);
        formData.top = new FormAttachment(0, 0);
        formData.bottom = new FormAttachment(100, 0);

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        super();
    }


    @Override
    public void createPartControl( Composite parent ) {
        FormLayout layout = new FormLayout();
        parent.setLayout(layout);


        locationEntry = new LocationEntry(this);
        Control control = locationEntry.createControl(parent);
        FormData data = new FormData();

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  public FeaturePanelList(Composite parent,
          FeaturePanelWidgetFactory factory) {
    super(parent, SWT.NO_FOCUS);
    this.factory = factory;
    removeAll();
    setLayout(new FormLayout());
    initColours();
    initAccessible();
    topNavigationElement = new TopNavigationElement(this);
    bottomNavigationElement = new BottomNavigationElement(this);

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    /**
     * Create the main composite.
     */
    protected void createMainComposite() {
        mainComposite = factory.createComposite(this, SWT.NO_FOCUS | SWT.NO_SCROLL);
        mainComposite.setLayout(new FormLayout());
        FormData formData = new FormData();
        formData.left = new FormAttachment(0, 0);
        formData.right = new FormAttachment(100, 0);
        formData.top = new FormAttachment(0, 0);
        formData.bottom = new FormAttachment(100, 0);

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            data.top = new FormAttachment(0, 0);
            title.setLayoutData(data);
        }


        leftComposite = factory.createComposite(mainComposite, SWT.NO_FOCUS);
        leftComposite.setLayout(new FormLayout());


        scrolledComposite = factory.createScrolledComposite(mainComposite, SWT.H_SCROLL
                | SWT.V_SCROLL | SWT.NO_FOCUS);


        FormData formData = new FormData();
        formData.left = new FormAttachment(leftComposite, 0);
        formData.right = new FormAttachment(100, 0);
        if (displayTitle) {
            formData.top = new FormAttachment(title, 0);
        } else {
            formData.top = new FormAttachment(0, 0);
        }
        formData.bottom = new FormAttachment(100, 0);
        scrolledComposite.setLayoutData(formData);


        formData = new FormData();
        formData.left = new FormAttachment(0, 0);
        formData.right = new FormAttachment(scrolledComposite, 0);
        if (displayTitle) {
            formData.top = new FormAttachment(title, 0);
        } else {
            formData.top = new FormAttachment(0, 0);
        }
        formData.bottom = new FormAttachment(100, 0);
        leftComposite.setLayoutData(formData);


        tabComposite = factory.createComposite(scrolledComposite, SWT.NO_FOCUS);
        tabComposite.setLayout(new FormLayout());


        scrolledComposite.setContent(tabComposite);
        scrolledComposite.setAlwaysShowScrollBars(false);
        scrolledComposite.setExpandVertical(true);
        scrolledComposite.setExpandHorizontal(true);

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        factory.getColors().initializeSectionToolBarColors();
        setBackground(factory.getColors().getBackground());
        setForeground(factory.getColors().getForeground());


        FormLayout layout = new FormLayout();
        layout.marginWidth = 1;
        layout.marginHeight = 2;
        setLayout(layout);


        Font font;

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     * @param parent the composite parent.
     * @return the composite.
     */
    public Composite createFlatFormComposite( Composite parent ) {
        Composite composite = createComposite(parent);
        FormLayout layout = new FormLayout();
        layout.marginWidth = 5 + 2;
        layout.marginHeight = 4;
        layout.spacing = 6 + 1;
        composite.setLayout(layout);
        return composite;

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  protected Composite createTitleArea(Composite parent) {
    // Create the title area which will contain
    // a title, message, and image.
    int margins = 2;
    titleArea = new Composite(parent, SWT.NONE);
    FormLayout layout = new FormLayout();
    layout.marginHeight = 0;
    layout.marginWidth = margins;
    titleArea.setLayout(layout);

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        });
        
        Composite buttonComposite = new Composite(listComposite, SWT.NONE);
        buttonComposite.setLayoutData(new GridData(SWT.LEFT, SWT.TOP, false, false));
        buttonComposite.setLayout(new FormLayout());
        
        listAddButton = new Button(buttonComposite, SWT.PUSH);
        listAddButton.setText("Add");
        FormData data = new FormData();
        data.left = new FormAttachment(0, standardPadding);

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        label.setText(Messages.StylingConstants_label_anchor);
        label.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, false));
        label.setToolTipText(Messages.StylingConstants_tooltip_anchor);
        Composite anchorComposite = new Composite(graphicComposite, SWT.NONE);
        anchorComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
        anchorComposite.setLayout(new FormLayout());
        anchorXViewer = new ComboExpressionViewer(anchorComposite, SWT.SINGLE);
        anchorXViewer.setOptions(getAnchorList());
        FormData data = new FormData();
        data.left = new FormAttachment(0, 0);
        data.top = new FormAttachment(0, 0);
        data.bottom = new FormAttachment(100, 0);
        anchorXViewer.getControl().setLayoutData(data);
        anchorXViewer.getControl().setToolTipText(Messages.StylingConstants_tooltip_anchor);
        label = new Label(anchorComposite, SWT.NONE);
        label.setText("X");
        data = new FormData();
        data.left = new FormAttachment(anchorXViewer.getControl(), 4);
        data.bottom = new FormAttachment(anchorXViewer.getControl(), 0, SWT.BOTTOM) ;
        label.setLayoutData(data);
        label.setToolTipText(Messages.StylingConstants_tooltip_anchor);
        anchorYViewer = new ComboExpressionViewer(anchorComposite, SWT.SINGLE);
        anchorYViewer.setOptions(getAnchorList());
        data = new FormData();
        data.left = new FormAttachment(label, 4);
        data.top = new FormAttachment(anchorXViewer.getControl(), 0, SWT.TOP);
        data.bottom = new FormAttachment(anchorXViewer.getControl(), 0, SWT.BOTTOM);
        data.right = new FormAttachment(100, 0);
        anchorYViewer.getControl().setLayoutData(data);
        anchorYViewer.getControl().setToolTipText(Messages.StylingConstants_tooltip_anchor);
        
        label = new Label(graphicComposite, SWT.NONE);
        label.setText(Messages.StylingConstants_label_displacement);
        label.setLayoutData(new GridData(SWT.LEFT, SWT.FILL, false, false));
        label.setToolTipText(Messages.StylingConstants_tooltip_displacement);
        Composite displacementComposite = new Composite(graphicComposite, SWT.NONE);
        displacementComposite.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, false));
        displacementComposite.setLayout(new FormLayout());
        displacementXViewer = new ComboExpressionViewer(displacementComposite, SWT.SINGLE);
        displacementXViewer.setOptions(getDisplacementList());
        data = new FormData();
        data.left = new FormAttachment(0, 0);
        data.top = new FormAttachment(0, 0);

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