Java Tutorial/SWT/ScrolledComposite

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Create a ScrolledComposite with wrapping content

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * Create a ScrolledComposite with wrapping content.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.ControlAdapter;
import org.eclipse.swt.events.ControlEvent;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Label;
import org.eclipse.swt.widgets.Shell;
public class ScrolledCompositeCreate {
  public static void main(String[] args) {
    Display display = new Display();
    Image image1 = display.getSystemImage(SWT.ICON_WORKING);
    Image image2 = display.getSystemImage(SWT.ICON_QUESTION);
    Image image3 = display.getSystemImage(SWT.ICON_ERROR);
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final ScrolledComposite scrollComposite = new ScrolledComposite(shell, SWT.V_SCROLL
        | SWT.BORDER);
    final Composite parent = new Composite(scrollComposite, SWT.NONE);
    for (int i = 0; i <= 50; i++) {
      Label label = new Label(parent, SWT.NONE);
      if (i % 3 == 0)
        label.setImage(image1);
      if (i % 3 == 1)
        label.setImage(image2);
      if (i % 3 == 2)
        label.setImage(image3);
    }
    RowLayout layout = new RowLayout(SWT.HORIZONTAL);
    layout.wrap = true;
    parent.setLayout(layout);
    scrollComposite.setContent(parent);
    scrollComposite.setExpandVertical(true);
    scrollComposite.setExpandHorizontal(true);
    scrollComposite.addControlListener(new ControlAdapter() {
      public void controlResized(ControlEvent e) {
        Rectangle r = scrollComposite.getClientArea();
        scrollComposite.setMinSize(parent.ruputeSize(r.width, SWT.DEFAULT));
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}





Create the ScrolledComposite to scroll horizontally and vertically

  1. SWT.H_SCROLL: horizontal scrolling.
  2. SWT.V_SCROLL: vertical scrolling.
  3. SWT.H_SCROLL | SWT.V_SCROLL: enable both.



import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ScrollCompisiteHoriVertical {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("SashForm Test");
    shell.setLayout(new FillLayout());
//  Create the ScrolledComposite to scroll horizontally and vertically
    ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
    Composite child = new Composite(sc, SWT.NONE);
    child.setLayout(new FillLayout());
    new Button(child, SWT.PUSH).setText("One");
    new Button(child, SWT.PUSH).setText("Two");
    child.setSize(400, 400);
    sc.setContent(child);
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}





Create two ScrolledComposites that scroll in tandem

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * Create two ScrolledComposites that scroll in tandem.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.ScrollBar;
import org.eclipse.swt.widgets.Shell;
public class ScrolledCompositeInTandem {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    final ScrolledComposite sc1 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
        | SWT.V_SCROLL);
    Button button1 = new Button(sc1, SWT.PUSH);
    button1.setText("Button 1");
    button1.setSize(400, 300);
    sc1.setContent(button1);
    final ScrolledComposite sc2 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
        | SWT.V_SCROLL);
    Button button2 = new Button(sc2, SWT.PUSH);
    button2.setText("Button 2");
    button2.setSize(300, 400);
    sc2.setContent(button2);
    final ScrollBar vBar1 = sc1.getVerticalBar();
    final ScrollBar vBar2 = sc2.getVerticalBar();
    final ScrollBar hBar1 = sc1.getHorizontalBar();
    final ScrollBar hBar2 = sc2.getHorizontalBar();
    SelectionListener listener1 = new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        int x = hBar1.getSelection() * (hBar2.getMaximum() - hBar2.getThumb())
            / Math.max(1, hBar1.getMaximum() - hBar1.getThumb());
        int y = vBar1.getSelection() * (vBar2.getMaximum() - vBar2.getThumb())
            / Math.max(1, vBar1.getMaximum() - vBar1.getThumb());
        sc2.setOrigin(x, y);
      }
    };
    SelectionListener listener2 = new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        int x = hBar2.getSelection() * (hBar1.getMaximum() - hBar1.getThumb())
            / Math.max(1, hBar2.getMaximum() - hBar2.getThumb());
        int y = vBar2.getSelection() * (vBar1.getMaximum() - vBar1.getThumb())
            / Math.max(1, vBar2.getMaximum() - vBar2.getThumb());
        sc1.setOrigin(x, y);
      }
    };
    vBar1.addSelectionListener(listener1);
    hBar1.addSelectionListener(listener1);
    vBar2.addSelectionListener(listener2);
    hBar2.addSelectionListener(listener2);
    shell.setSize(400, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





If the window is too small, scrollbars will appear.

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * ScrolledComposite example snippet: scroll a control in a scrolled composite
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ScrollBarAuto {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    // this button has a minimum size of 400 x 400. If the window is resized to be big
    // enough to show more than 400 x 400, the button will grow in size. If the window
    // is made too small to show 400 x 400, scrollbars will appear.
    ScrolledComposite c2 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    Button b2 = new Button(c2, SWT.PUSH);
    b2.setText("expanding button");
    c2.setContent(b2);
    c2.setExpandHorizontal(true);
    c2.setExpandVertical(true);
    c2.setMinWidth(400);
    c2.setMinHeight(400);
    shell.setSize(600, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Scroll a widget into view on focus in

/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ******************************************************************************/
// package org.eclipse.swt.snippets;
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
/*
 * Scroll a widget into view on focus in
 * 
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 * 
 * @since 3.0
 */
public class ScrollWidgetViewFocusIn {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new GridLayout());
    Button b1 = new Button(shell, SWT.PUSH);
    b1.setText("top");
    b1.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
    final ScrolledComposite sc = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL
        | SWT.V_SCROLL);
    sc.setLayoutData(new GridData(SWT.FILL, SWT.FILL, true, true, 1, 1));
    Composite c = new Composite(sc, SWT.NONE);
    c.setLayout(new GridLayout(10, true));
    for (int i = 0; i < 300; i++) {
      Button b = new Button(c, SWT.PUSH);
      b.setText("Button " + i);
    }
    Button b2 = new Button(shell, SWT.PUSH);
    b2.setText("bottom");
    b2.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, false, false, 1, 1));
    sc.setContent(c);
    sc.setExpandHorizontal(true);
    sc.setExpandVertical(true);
    sc.setMinSize(c.ruputeSize(SWT.DEFAULT, SWT.DEFAULT));
    Listener listener = new Listener() {
      public void handleEvent(Event e) {
        Control child = (Control) e.widget;
        Rectangle bounds = child.getBounds();
        Rectangle area = sc.getClientArea();
        Point origin = sc.getOrigin();
        if (origin.x > bounds.x)
          origin.x = Math.max(0, bounds.x);
        if (origin.y > bounds.y)
          origin.y = Math.max(0, bounds.y);
        if (origin.x + area.width < bounds.x + bounds.width)
          origin.x = Math.max(0, bounds.x + bounds.width - area.width);
        if (origin.y + area.height < bounds.y + bounds.height)
          origin.y = Math.max(0, bounds.y + bounds.height - area.height);
        sc.setOrigin(origin);
      }
    };
    Control[] controls = c.getChildren();
    for (int i = 0; i < controls.length; i++) {
      controls[i].addListener(SWT.Activate, listener);
    }
    shell.setSize(300, 500);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Scrollbars appear if the window is resized to be too small to show part of the button

/*******************************************************************************
 * Copyright (c) 2000, 2004 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
//package org.eclipse.swt.snippets;
/*
 * ScrolledComposite example snippet: scroll a control in a scrolled composite
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ScollCompositeControl {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setLayout(new FillLayout());
    // this button is always 400 x 400. Scrollbars appear if the window is
    // resized to be
    // too small to show part of the button
    ScrolledComposite c1 = new ScrolledComposite(shell, SWT.BORDER | SWT.H_SCROLL | SWT.V_SCROLL);
    Button b1 = new Button(c1, SWT.PUSH);
    b1.setText("fixed size button");
    b1.setSize(400, 400);
    c1.setContent(b1);
    shell.setSize(600, 300);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}





Setting Minimum Size for a Child Control

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ScrolledCompositeMiniSize {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("SashForm Test");
    shell.setLayout(new FillLayout());
    // Create the ScrolledComposite to scroll horizontally and vertically
    ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
    Composite child = new Composite(sc, SWT.NONE);
    child.setLayout(new FillLayout());
    new Button(child, SWT.PUSH).setText("One");
    new Button(child, SWT.PUSH).setText("Two");
    sc.setMinSize(400, 400);
    // Expand both horizontally and vertically
    sc.setExpandHorizontal(true);
    sc.setExpandVertical(true);
    sc.setContent(child);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}





Setting the Child Control"s Size

import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.ScrolledComposite;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.ruposite;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class ScrolledCompositeChildSize {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setText("SashForm Test");
    shell.setLayout(new FillLayout());
//  Create the ScrolledComposite to scroll horizontally and vertically
    ScrolledComposite sc = new ScrolledComposite(shell, SWT.H_SCROLL | SWT.V_SCROLL);
    Composite child = new Composite(sc, SWT.NONE);
    child.setLayout(new FillLayout());
    new Button(child, SWT.PUSH).setText("One");
    new Button(child, SWT.PUSH).setText("Two");
    child.setSize(400, 400);
    sc.setContent(child);
    
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch()) {
        display.sleep();
      }
    }
    display.dispose();
  }
}


Источник — «http://jexp.ru/index.php?title=Java_Tutorial/SWT/ScrolledComposite&oldid=3038»