Example usage for org.eclipse.swt.widgets Button setText

List of usage examples for org.eclipse.swt.widgets Button setText

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Introduction

In this page you can find the example usage for org.eclipse.swt.widgets Button setText.

Prototype

public void setText(String text)

Source Link

Document

Sets the receiver's text.

Usage

From source file:org.eclipse.swt.snippets.Snippet354.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 354");
    shell.setLayout(new GridLayout(1, false));

    Menu appMenuBar = display.getMenuBar();
    if (appMenuBar == null) {
        appMenuBar = new Menu(shell, SWT.BAR);
        shell.setMenuBar(appMenuBar);//from   w  w w.j a  v  a 2 s.c om
    }
    MenuItem file = new MenuItem(appMenuBar, SWT.CASCADE);
    file.setText("File");
    Menu dropdown = new Menu(appMenuBar);
    file.setMenu(dropdown);
    MenuItem exit = new MenuItem(dropdown, SWT.PUSH);
    exit.setText("Exit");
    exit.addSelectionListener(widgetSelectedAdapter(e -> display.dispose()));

    Listener keyDownFilter = event -> System.out.println("Key event!");
    display.addFilter(SWT.KeyDown, keyDownFilter);
    display.addFilter(SWT.KeyUp, keyDownFilter);

    ArmListener armListener = e -> System.out.println(e);

    Menu systemMenu = display.getSystemMenu();
    if (systemMenu != null) {
        systemMenu.addMenuListener(new MenuListener() {
            @Override
            public void menuHidden(MenuEvent e) {
                System.out.println("App menu closed");
            }

            @Override
            public void menuShown(MenuEvent e) {
                System.out.println("App menu opened");
            }
        });

        MenuItem sysItem = getItem(systemMenu, SWT.ID_QUIT);
        sysItem.addArmListener(armListener);
        sysItem.addSelectionListener(widgetSelectedAdapter(e -> System.out.println("Quit selected")));
        sysItem = getItem(systemMenu, SWT.ID_HIDE_OTHERS);
        sysItem.addArmListener(armListener);
        sysItem.addSelectionListener(widgetSelectedAdapter(e -> {
            System.out.println("Hide others selected -- and blocked!");
            e.doit = false;
        }));
        sysItem = getItem(systemMenu, SWT.ID_HIDE);
        sysItem.addArmListener(armListener);
        sysItem.addSelectionListener(widgetSelectedAdapter(e -> {
            System.out.println("Hide selected -- and blocked!");
            e.doit = false;
        }));
        sysItem = getItem(systemMenu, SWT.ID_PREFERENCES);
        sysItem.addArmListener(armListener);
        sysItem.addSelectionListener(widgetSelectedAdapter(e -> System.out.println("Preferences selected")));
        sysItem = getItem(systemMenu, SWT.ID_ABOUT);
        sysItem.addArmListener(armListener);
        sysItem.addSelectionListener(widgetSelectedAdapter(e -> System.out.println("About selected")));

        int prefsIndex = systemMenu.indexOf(getItem(systemMenu, SWT.ID_PREFERENCES));
        MenuItem newAppMenuItem = new MenuItem(systemMenu, SWT.CASCADE, prefsIndex + 1);
        newAppMenuItem.setText("SWT-added item");
        newAppMenuItem.setAccelerator(SWT.MOD1 | 'i');
        newAppMenuItem.addArmListener(armListener);
        newAppMenuItem.addSelectionListener(
                widgetSelectedAdapter(e -> System.out.println("SWT-added item selected")));
        Menu subMenu = new Menu(systemMenu);

        for (int i = 0; i < 4; i++) {
            MenuItem subItem = new MenuItem(subMenu, SWT.PUSH);
            subItem.setText("Item " + i);
        }
        newAppMenuItem.setMenu(subMenu);
    }
    Button b = new Button(shell, SWT.PUSH);
    b.setText("Test");
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet282.java

public static void main(String[] args) {
    final Display display = new Display();
    final Clipboard clipboard = new Clipboard(display);
    final Shell shell = new Shell(display, SWT.SHELL_TRIM);
    shell.setText("Snippet 282");
    shell.setLayout(new GridLayout());
    shell.setText("Clipboard ImageTransfer");

    final Button imageButton = new Button(shell, SWT.NONE);
    GridData gd = new GridData(SWT.FILL, SWT.FILL, true, true);
    gd.minimumHeight = 400;/*from   w  w w.  j  ava  2s .  c  o  m*/
    gd.minimumWidth = 600;
    imageButton.setLayoutData(gd);

    final Text imageText = new Text(shell, SWT.BORDER);
    imageText.setLayoutData(new GridData(SWT.FILL, SWT.BEGINNING, true, false));

    Composite buttons = new Composite(shell, SWT.NONE);
    buttons.setLayout(new GridLayout(4, true));
    Button button = new Button(buttons, SWT.PUSH);
    button.setText("Open");
    button.addListener(SWT.Selection, event -> {
        FileDialog dialog = new FileDialog(shell, SWT.OPEN);
        dialog.setText("Open an image file or cancel");
        String string = dialog.open();
        if (string != null) {
            imageButton.setText("");
            Image image = imageButton.getImage();
            if (image != null)
                image.dispose();
            image = new Image(display, string);
            imageButton.setImage(image);
            imageText.setText(string);
        }
    });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Copy");
    button.addListener(SWT.Selection, event -> {
        Image image = imageButton.getImage();
        if (image != null) {
            ImageTransfer imageTransfer = ImageTransfer.getInstance();
            TextTransfer textTransfer = TextTransfer.getInstance();
            clipboard.setContents(new Object[] { image.getImageData(), imageText.getText() },
                    new Transfer[] { imageTransfer, textTransfer });
        }
    });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Paste");
    button.addListener(SWT.Selection, event -> {
        ImageData imageData = (ImageData) clipboard.getContents(ImageTransfer.getInstance());
        if (imageData != null) {
            imageButton.setText("");
            Image image = imageButton.getImage();
            if (image != null)
                image.dispose();
            image = new Image(display, imageData);
            imageButton.setImage(image);
        } else {
            imageButton.setText("No image");
            imageButton.setImage(null);
        }
        String text = (String) clipboard.getContents(TextTransfer.getInstance());
        if (text != null) {
            imageText.setText(text);
        } else {
            imageText.setText("");
        }
    });

    button = new Button(buttons, SWT.PUSH);
    button.setText("Clear");
    button.addListener(SWT.Selection, event -> {
        imageButton.setText("");
        Image image = imageButton.getImage();
        if (image != null)
            image.dispose();
        imageButton.setImage(null);
        imageText.setText("");
    });

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:YetAnotherBorderLayout.java

public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new YetAnotherBorderLayout());
    Button b1 = new Button(shell, SWT.PUSH);
    b1.setText("North");
    b1.setLayoutData(BorderData.NORTH);/*w w  w  .ja v a2 s .co  m*/
    Button b2 = new Button(shell, SWT.PUSH);
    b2.setText("South");
    b2.setLayoutData(BorderData.SOUTH);
    Button b3 = new Button(shell, SWT.PUSH);
    b3.setText("East");
    b3.setLayoutData(BorderData.EAST);
    Button b4 = new Button(shell, SWT.PUSH);
    b4.setText("West");
    b4.setLayoutData(BorderData.WEST);
    Button b5 = new Button(shell, SWT.PUSH);
    b5.setText("Center");
    b5.setLayoutData(BorderData.CENTER);
    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet223.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.setText("ExpandBar Example");
    ExpandBar bar = new ExpandBar(shell, SWT.V_SCROLL);
    Image image = display.getSystemImage(SWT.ICON_QUESTION);

    // First item
    Composite composite = new Composite(bar, SWT.NONE);
    GridLayout layout = new GridLayout();
    layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 10;
    layout.verticalSpacing = 10;// ww w  .  j a va2s. c o m
    composite.setLayout(layout);
    Button button = new Button(composite, SWT.PUSH);
    button.setText("SWT.PUSH");
    button = new Button(composite, SWT.RADIO);
    button.setText("SWT.RADIO");
    button = new Button(composite, SWT.CHECK);
    button.setText("SWT.CHECK");
    button = new Button(composite, SWT.TOGGLE);
    button.setText("SWT.TOGGLE");
    ExpandItem item0 = new ExpandItem(bar, SWT.NONE, 0);
    item0.setText("What is your favorite button");
    item0.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
    item0.setControl(composite);
    item0.setImage(image);

    // Second item
    composite = new Composite(bar, SWT.NONE);
    layout = new GridLayout(2, false);
    layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 10;
    layout.verticalSpacing = 10;
    composite.setLayout(layout);
    Label label = new Label(composite, SWT.NONE);
    label.setImage(display.getSystemImage(SWT.ICON_ERROR));
    label = new Label(composite, SWT.NONE);
    label.setText("SWT.ICON_ERROR");
    label = new Label(composite, SWT.NONE);
    label.setImage(display.getSystemImage(SWT.ICON_INFORMATION));
    label = new Label(composite, SWT.NONE);
    label.setText("SWT.ICON_INFORMATION");
    label = new Label(composite, SWT.NONE);
    label.setImage(display.getSystemImage(SWT.ICON_WARNING));
    label = new Label(composite, SWT.NONE);
    label.setText("SWT.ICON_WARNING");
    label = new Label(composite, SWT.NONE);
    label.setImage(display.getSystemImage(SWT.ICON_QUESTION));
    label = new Label(composite, SWT.NONE);
    label.setText("SWT.ICON_QUESTION");
    ExpandItem item1 = new ExpandItem(bar, SWT.NONE, 1);
    item1.setText("What is your favorite icon");
    item1.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
    item1.setControl(composite);
    item1.setImage(image);

    // Third item
    composite = new Composite(bar, SWT.NONE);
    layout = new GridLayout(2, true);
    layout.marginLeft = layout.marginTop = layout.marginRight = layout.marginBottom = 10;
    layout.verticalSpacing = 10;
    composite.setLayout(layout);
    label = new Label(composite, SWT.NONE);
    label.setText("Scale");
    new Scale(composite, SWT.NONE);
    label = new Label(composite, SWT.NONE);
    label.setText("Spinner");
    new Spinner(composite, SWT.BORDER);
    label = new Label(composite, SWT.NONE);
    label.setText("Slider");
    new Slider(composite, SWT.NONE);
    ExpandItem item2 = new ExpandItem(bar, SWT.NONE, 2);
    item2.setText("What is your favorite range widget");
    item2.setHeight(composite.computeSize(SWT.DEFAULT, SWT.DEFAULT).y);
    item2.setControl(composite);
    item2.setImage(image);

    item1.setExpanded(true);
    bar.setSpacing(8);
    shell.setSize(400, 350);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    image.dispose();
    display.dispose();
}

From source file:GridLayoutSimpleDmo.java

public static void main(String[] args) {
    Display display = new Display();
    final Shell shell = new Shell(display);

    GridLayout gridLayout = new GridLayout(4, false);
    gridLayout.verticalSpacing = 8;//  w  ww.  jav  a 2s  .  c  o m

    shell.setLayout(gridLayout);

    Label label = new Label(shell, SWT.NULL);
    label.setText("Title: ");

    Text title = new Text(shell, SWT.SINGLE | SWT.BORDER);
    GridData gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.horizontalSpan = 3;
    title.setLayoutData(gridData);

    label = new Label(shell, SWT.NULL);
    label.setText("Author(s): ");

    Text authors = new Text(shell, SWT.SINGLE | SWT.BORDER);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL);
    gridData.horizontalSpan = 3;
    authors.setLayoutData(gridData);

    label = new Label(shell, SWT.NULL);
    label.setText("Cover: ");

    gridData = new GridData();
    gridData.verticalSpan = 3;
    label.setLayoutData(gridData);

    CLabel cover = new CLabel(shell, SWT.NULL);

    gridData = new GridData(GridData.FILL_HORIZONTAL);
    gridData.horizontalSpan = 1;
    gridData.verticalSpan = 3;
    gridData.heightHint = 100;
    gridData.widthHint = 100;

    cover.setLayoutData(gridData);

    label = new Label(shell, SWT.NULL);
    label.setText("Pages");

    Text pages = new Text(shell, SWT.SINGLE | SWT.BORDER);
    pages.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

    label = new Label(shell, SWT.NULL);
    label.setText("Publisher");

    Text publisher = new Text(shell, SWT.SINGLE | SWT.BORDER);
    publisher.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));

    label = new Label(shell, SWT.NULL);
    label.setText("Rating");

    Combo rating = new Combo(shell, SWT.READ_ONLY);
    rating.setLayoutData(new GridData(GridData.HORIZONTAL_ALIGN_FILL));
    rating.add("5");
    rating.add("4");
    rating.add("3");
    rating.add("2");
    rating.add("1");

    label = new Label(shell, SWT.NULL);
    label.setText("Abstract:");

    Text bookAbstract = new Text(shell, SWT.WRAP | SWT.MULTI | SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    gridData = new GridData(GridData.HORIZONTAL_ALIGN_FILL | GridData.VERTICAL_ALIGN_FILL);
    gridData.horizontalSpan = 3;
    gridData.grabExcessVerticalSpace = true;

    bookAbstract.setLayoutData(gridData);

    Button enter = new Button(shell, SWT.PUSH);
    enter.setText("Enter");

    gridData = new GridData();
    gridData.horizontalSpan = 4;
    gridData.horizontalAlignment = GridData.END;
    enter.setLayoutData(gridData);

    title.setText("Professional Java Interfaces with SWT/JFace");
    authors.setText("Jack Li Guojie");
    pages.setText("500pp");
    publisher.setText("John Wiley & Sons");
    cover.setBackground(new Image(display, "yourFile.gif"));
    bookAbstract.setText("SWT/JFace. ");

    shell.setSize(450, 400);
    shell.open();

    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            display.sleep();
        }
    }
    display.dispose();
}

From source file:StyledTextEmbebControls.java

public static void main(String[] args) {
    final Display display = new Display();
    Font font = new Font(display, "Tahoma", 32, SWT.NORMAL);
    final Shell shell = new Shell(display);
    shell.setLayout(new GridLayout());
    styledText = new StyledText(shell, SWT.WRAP | SWT.BORDER);
    styledText.setFont(font);/*from  w  w w .  ja va2  s . c o  m*/
    styledText.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    styledText.setText(text);
    controls = new Control[2];
    Button button = new Button(styledText, SWT.PUSH);
    button.setText("Button 1");
    controls[0] = button;
    Combo combo = new Combo(styledText, SWT.NONE);
    combo.add("item 1");
    combo.add("another item");
    controls[1] = combo;
    offsets = new int[controls.length];
    int lastOffset = 0;
    for (int i = 0; i < controls.length; i++) {
        int offset = text.indexOf("\uFFFC", lastOffset);
        offsets[i] = offset;
        addControl(controls[i], offsets[i]);
        lastOffset = offset + 1;
    }

    // use a verify listener to keep the offsets up to date
    styledText.addVerifyListener(new VerifyListener() {
        public void verifyText(VerifyEvent e) {
            int start = e.start;
            int replaceCharCount = e.end - e.start;
            int newCharCount = e.text.length();
            for (int i = 0; i < offsets.length; i++) {
                int offset = offsets[i];
                if (start <= offset && offset < start + replaceCharCount) {
                    // this widget is being deleted from the text
                    if (controls[i] != null && !controls[i].isDisposed()) {
                        controls[i].dispose();
                        controls[i] = null;
                    }
                    offset = -1;
                }
                if (offset != -1 && offset >= start)
                    offset += newCharCount - replaceCharCount;
                offsets[i] = offset;
            }
        }
    });

    // reposition widgets on paint event
    styledText.addPaintObjectListener(new PaintObjectListener() {
        public void paintObject(PaintObjectEvent event) {
            StyleRange style = event.style;
            int start = style.start;
            for (int i = 0; i < offsets.length; i++) {
                int offset = offsets[i];
                if (start == offset) {
                    Point pt = controls[i].getSize();
                    int x = event.x + MARGIN;
                    int y = event.y + event.ascent - 2 * pt.y / 3;
                    controls[i].setLocation(x, y);
                    break;
                }
            }
        }
    });

    shell.setSize(400, 400);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    font.dispose();
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet21.java

public static void main(String[] args) {
    Display display = new Display();
    final Color red = display.getSystemColor(SWT.COLOR_RED);
    final Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    Shell shell = new Shell(display);
    shell.setText("Snippet 21");
    Button b = new Button(shell, SWT.PUSH);
    Rectangle clientArea = shell.getClientArea();
    b.setBounds(clientArea.x + 10, clientArea.y + 10, 100, 32);
    b.setText("Button");
    shell.setDefaultButton(b);// ww  w.  j av a 2 s  .  co m
    final Canvas c = new Canvas(shell, SWT.BORDER);
    c.setBounds(10, 50, 100, 32);
    c.addListener(SWT.Traverse, e -> {
        switch (e.detail) {
        /* Do tab group traversal */
        case SWT.TRAVERSE_ESCAPE:
        case SWT.TRAVERSE_RETURN:
        case SWT.TRAVERSE_TAB_NEXT:
        case SWT.TRAVERSE_TAB_PREVIOUS:
        case SWT.TRAVERSE_PAGE_NEXT:
        case SWT.TRAVERSE_PAGE_PREVIOUS:
            e.doit = true;
            break;
        }
    });
    c.addListener(SWT.FocusIn, e -> c.setBackground(red));
    c.addListener(SWT.FocusOut, e -> c.setBackground(blue));
    c.addListener(SWT.KeyDown, e -> System.out.println("KEY"));
    Text t = new Text(shell, SWT.SINGLE | SWT.BORDER);
    t.setBounds(10, 85, 100, 32);

    Text r = new Text(shell, SWT.MULTI | SWT.BORDER);
    r.setBounds(10, 120, 100, 32);

    c.setFocus();
    shell.setSize(200, 200);
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:org.eclipse.swt.examples.accessibility.AccessibleTableExample.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout());
    shell.setText("Accessible Table Example");

    Group group = new Group(shell, SWT.NONE);
    group.setText("Tables With Accessible Cell Children");
    group.setLayout(new GridLayout());

    new Label(group, SWT.NONE).setText("CTable with column headers");

    table1 = new CTable(group, SWT.MULTI | SWT.FULL_SELECTION | SWT.BORDER);
    table1.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    table1.setHeaderVisible(true);//  w w w.  java2  s.com
    table1.setLinesVisible(true);
    for (int col = 0; col < 3; col++) {
        CTableColumn column = new CTableColumn(table1, SWT.NONE);
        column.setText("Col " + col);
        column.setWidth(50);
    }
    for (int row = 0; row < 4; row++) {
        CTableItem item = new CTableItem(table1, SWT.NONE);
        item.setText(new String[] { "C0R" + row, "C1R" + row, "C2R" + row });
    }

    Composite btnGroup = new Composite(group, SWT.NONE);
    btnGroup.setLayout(new FillLayout(SWT.VERTICAL));
    Button btn = new Button(btnGroup, SWT.PUSH);
    btn.setText("Add rows");
    btn.addSelectionListener(widgetSelectedAdapter(e -> {
        int currSize = table1.getItemCount();
        int colCount = table1.getColumnCount();
        CTableItem item = new CTableItem(table1, SWT.NONE);
        String[] cells = new String[colCount];

        for (int i = 0; i < colCount; i++) {
            cells[i] = "C" + i + "R" + currSize;
        }
        item.setText(cells);
    }));
    btn = new Button(btnGroup, SWT.PUSH);
    btn.setText("Remove rows");
    btn.addSelectionListener(widgetSelectedAdapter(e -> {
        int currSize = table1.getItemCount();
        if (currSize > 0) {
            table1.remove(currSize - 1);
        }
    }));
    btn = new Button(btnGroup, SWT.PUSH);
    btn.setText("Remove selected rows");
    btn.addSelectionListener(widgetSelectedAdapter(e -> {
        CTableItem[] selectedItems = table1.getSelection();
        for (CTableItem selectedItem : selectedItems) {
            selectedItem.dispose();
        }
    }));
    btn = new Button(btnGroup, SWT.PUSH);
    btn.setText("Add column");
    btn.addSelectionListener(widgetSelectedAdapter(e -> {
        int currSize = table1.getColumnCount();
        CTableColumn item = new CTableColumn(table1, SWT.NONE);
        item.setText("Col " + currSize);
        item.setWidth(50);
    }));
    btn = new Button(btnGroup, SWT.PUSH);
    btn.setText("Remove last column");

    btn.addSelectionListener(widgetSelectedAdapter(e -> {
        int colCount = table1.getColumnCount();
        if (colCount > 0) {
            CTableColumn column = table1.getColumn(colCount - 1);
            column.dispose();
        }
    }));

    new Label(group, SWT.NONE).setText("CTable used as a list");

    CTable table2 = new CTable(group, SWT.MULTI | SWT.FULL_SELECTION | SWT.BORDER);
    table2.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true));
    table2.setLinesVisible(true);
    for (String element : itemText) {
        CTableItem item = new CTableItem(table2, SWT.NONE);
        item.setText(element);
    }

    shell.pack();
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:org.eclipse.swt.snippets.Snippet296.java

public static void main(String[] args) {
    final Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("Snippet 296");
    shell.setBounds(10, 10, 300, 300);/*w w w .jav a 2  s  .  c  om*/
    final ScrolledComposite sc = new ScrolledComposite(shell, SWT.VERTICAL);
    sc.setBounds(10, 10, 280, 200);
    final int clientWidth = sc.getClientArea().width;

    final Tree tree = new Tree(sc, SWT.NONE);
    for (int i = 0; i < 99; i++) {
        TreeItem item = new TreeItem(tree, SWT.NONE);
        item.setText("item " + i);
        new TreeItem(item, SWT.NONE).setText("child");
    }
    sc.setContent(tree);
    int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
    tree.setSize(clientWidth, prefHeight);
    /*
     * The following listener ensures that the Tree is always large
     * enough to not need to show its own vertical scrollbar.
     */
    tree.addTreeListener(new TreeListener() {
        @Override
        public void treeExpanded(TreeEvent e) {
            int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
            tree.setSize(clientWidth, prefHeight);
        }

        @Override
        public void treeCollapsed(TreeEvent e) {
            int prefHeight = tree.computeSize(SWT.DEFAULT, SWT.DEFAULT).y;
            tree.setSize(clientWidth, prefHeight);
        }
    });
    /*
     * The following listener ensures that a newly-selected item
     * in the Tree is always visible.
     */
    tree.addSelectionListener(widgetSelectedAdapter(e -> {
        TreeItem[] selectedItems = tree.getSelection();
        if (selectedItems.length > 0) {
            Rectangle itemRect = selectedItems[0].getBounds();
            Rectangle area = sc.getClientArea();
            Point origin = sc.getOrigin();
            if (itemRect.x < origin.x || itemRect.y < origin.y
                    || itemRect.x + itemRect.width > origin.x + area.width
                    || itemRect.y + itemRect.height > origin.y + area.height) {
                sc.setOrigin(itemRect.x, itemRect.y);
            }
        }
    }));
    /*
     * The following listener scrolls the Tree one item at a time
     * in response to MouseWheel events.
     */
    tree.addListener(SWT.MouseWheel, event -> {
        Point origin = sc.getOrigin();
        if (event.count < 0) {
            origin.y = Math.min(origin.y + tree.getItemHeight(), tree.getSize().y);
        } else {
            origin.y = Math.max(origin.y - tree.getItemHeight(), 0);
        }
        sc.setOrigin(origin);
    });

    Button downButton = new Button(shell, SWT.PUSH);
    downButton.setBounds(10, 220, 120, 30);
    downButton.setText("Down 10px");
    downButton.addListener(SWT.Selection, event -> sc.setOrigin(0, sc.getOrigin().y + 10));
    Button upButton = new Button(shell, SWT.PUSH);
    upButton.setBounds(140, 220, 120, 30);
    upButton.setText("Up 10px");
    upButton.addListener(SWT.Selection, event -> sc.setOrigin(0, sc.getOrigin().y - 10));
    shell.open();
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch())
            display.sleep();
    }
    display.dispose();
}

From source file:BorderLayoutSWT.java

public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);

    shell.setLayout(new BorderLayout());

    Button buttonWest = new Button(shell, SWT.PUSH);
    buttonWest.setText("West");
    buttonWest.setLayoutData(new BorderLayout.BorderData(BorderLayout.WEST));

    Button buttonEast = new Button(shell, SWT.PUSH);
    buttonEast.setText("East");
    buttonEast.setLayoutData(new BorderLayout.BorderData(BorderLayout.EAST));

    Button buttonNorth = new Button(shell, SWT.PUSH);
    buttonNorth.setText("North");
    buttonNorth.setLayoutData(new BorderLayout.BorderData(BorderLayout.NORTH));

    Button buttonSouth = new Button(shell, SWT.PUSH);
    buttonSouth.setText("South");
    buttonSouth.setLayoutData(new BorderLayout.BorderData(BorderLayout.SOUTH));

    Text text = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL | SWT.H_SCROLL);
    text.setText("Center");
    text.setLayoutData(new BorderLayout.BorderData(BorderLayout.CENTER));

    shell.pack();/*  ww w .  j a v  a2 s. c o m*/
    shell.open();
    // textUser.forceFocus();

    // Set up the event loop.
    while (!shell.isDisposed()) {
        if (!display.readAndDispatch()) {
            // If no more entries in event queue
            display.sleep();
        }
    }

    display.dispose();

}