Java/SWT JFace Eclipse/Cursor

Cursor: create a color cursor from an image file

/*
 * Cursor example snippet: create a color cursor from an image file
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.FileDialog;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class Snippet118 {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setSize(150, 150);
    final Cursor[] cursor = new Cursor[1];
    Button button = new Button(shell, SWT.PUSH);
    button.setText("Change cursor");
    Point size = button.ruputeSize(SWT.DEFAULT, SWT.DEFAULT);
    button.setSize(size);
    button.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        FileDialog dialog = new FileDialog(shell);
        dialog.setFilterExtensions(new String[] { "*.ico", "*.gif",
            "*.*" });
        String name = dialog.open();
        if (name == null)
          return;
        ImageData image = new ImageData(name);
        Cursor oldCursor = cursor[0];
        cursor[0] = new Cursor(display, image, 0, 0);
        shell.setCursor(cursor[0]);
        if (oldCursor != null)
          oldCursor.dispose();
      }
    });
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    if (cursor[0] != null)
      cursor[0].dispose();
    display.dispose();
  }
}

Cursor: create a color cursor from a source and a mask

/*
 * Cursor example snippet: create a color cursor from a source and a mask
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Snippet119 {
  static byte[] srcData = { (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x00, (byte) 0x00, (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x11, (byte) 0x10, (byte) 0x00, (byte) 0x01, (byte) 0x10,
      (byte) 0x00, (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x00,
      (byte) 0x22, (byte) 0x01, (byte) 0x10, (byte) 0x33, (byte) 0x00,
      (byte) 0x11, (byte) 0x10, (byte) 0x02, (byte) 0x22, (byte) 0x01,
      (byte) 0x10, (byte) 0x33, (byte) 0x30, (byte) 0x01, (byte) 0x10,
      (byte) 0x22, (byte) 0x22, (byte) 0x01, (byte) 0x10, (byte) 0x33,
      (byte) 0x33, (byte) 0x01, (byte) 0x10, (byte) 0x22, (byte) 0x22,
      (byte) 0x01, (byte) 0x10, (byte) 0x33, (byte) 0x33, (byte) 0x01,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x01, (byte) 0x11,
      (byte) 0x11, (byte) 0x01, (byte) 0x10, (byte) 0x11, (byte) 0x11,
      (byte) 0x10, (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x01,
      (byte) 0x10, (byte) 0x11, (byte) 0x11, (byte) 0x10, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00, (byte) 0x00,
      (byte) 0x00, (byte) 0x00, (byte) 0x10, (byte) 0x44, (byte) 0x44,
      (byte) 0x01, (byte) 0x10, (byte) 0x55, (byte) 0x55, (byte) 0x01,
      (byte) 0x10, (byte) 0x44, (byte) 0x44, (byte) 0x01, (byte) 0x10,
      (byte) 0x55, (byte) 0x55, (byte) 0x01, (byte) 0x10, (byte) 0x04,
      (byte) 0x44, (byte) 0x01, (byte) 0x10, (byte) 0x55, (byte) 0x50,
      (byte) 0x01, (byte) 0x11, (byte) 0x00, (byte) 0x44, (byte) 0x01,
      (byte) 0x10, (byte) 0x55, (byte) 0x00, (byte) 0x11, (byte) 0x11,
      (byte) 0x10, (byte) 0x00, (byte) 0x01, (byte) 0x10, (byte) 0x00,
      (byte) 0x01, (byte) 0x11, (byte) 0x11, (byte) 0x11, (byte) 0x11,
      (byte) 0x00, (byte) 0x00, (byte) 0x11, (byte) 0x11, (byte) 0x11, };
  static byte[] mskData = { (byte) 0x03, (byte) 0xc0, (byte) 0x1f,
      (byte) 0xf8, (byte) 0x3f, (byte) 0xfc, (byte) 0x7f, (byte) 0xfe,
      (byte) 0x7f, (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0xff,
      (byte) 0xff, (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0x7f,
      (byte) 0xff, (byte) 0xff, (byte) 0x7f, (byte) 0xfe, (byte) 0x7f,
      (byte) 0xfe, (byte) 0x7f, (byte) 0xfe, (byte) 0x3f, (byte) 0xfc,
      (byte) 0x1f, (byte) 0xf8, (byte) 0x03, (byte) 0xc0 };
  public static void main(String[] args) {
    Display display = new Display();
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    Color yellow = display.getSystemColor(SWT.COLOR_YELLOW);
    Color red = display.getSystemColor(SWT.COLOR_RED);
    Color green = display.getSystemColor(SWT.COLOR_GREEN);
    Color blue = display.getSystemColor(SWT.COLOR_BLUE);
    // Create a source ImageData of depth 4
    PaletteData palette = new PaletteData(new RGB[] { black.getRGB(),
        white.getRGB(), yellow.getRGB(), red.getRGB(), blue.getRGB(),
        green.getRGB() });
    ImageData sourceData = new ImageData(16, 16, 4, palette, 1, srcData);
    // Create a mask ImageData of depth 1 (monochrome)
    palette = new PaletteData(new RGB[] { black.getRGB(), white.getRGB(), });
    ImageData maskData = new ImageData(16, 16, 1, palette, 1, mskData);
    // Set mask
    sourceData.maskData = maskData.data;
    sourceData.maskPad = maskData.scanlinePad;
    // Create cursor
    Cursor cursor = new Cursor(display, sourceData, 10, 10);
    // Remove mask to draw them separately just to show what they look like
    sourceData.maskData = null;
    sourceData.maskPad = -1;
    Shell shell = new Shell(display);
    final Image source = new Image(display, sourceData);
    final Image mask = new Image(display, maskData);
    shell.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        GC gc = e.gc;
        int x = 10, y = 10;
        String stringSource = "source: ";
        String stringMask = "mask: ";
        gc.drawString(stringSource, x, y);
        gc.drawString(stringMask, x, y + 30);
        x += Math.max(gc.stringExtent(stringSource).x, gc
            .stringExtent(stringMask).x);
        gc.drawImage(source, x, y);
        gc.drawImage(mask, x, y + 30);
      }
    });
    shell.setSize(150, 150);
    shell.open();
    shell.setCursor(cursor);
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    source.dispose();
    mask.dispose();
    display.dispose();
  }
}

Cursor: create a cursor from a source and a mask

/*
 * Cursor example snippet: create a cursor from a source and a mask
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class Snippet92 {
public static void main (String [] args) {
  Display display = new Display();
  Color white = display.getSystemColor (SWT.COLOR_WHITE);
  Color black = display.getSystemColor (SWT.COLOR_BLACK);
  
  //Create a source ImageData of depth 1 (monochrome)
  PaletteData palette = new PaletteData (new RGB [] {white.getRGB(), black.getRGB(),});
  ImageData sourceData = new ImageData (20, 20, 1, palette);
  for (int i = 0; i < 10; i ++) {
    for (int j = 0; j < 20; j++) {
      sourceData.setPixel(i, j, 1);
    }
  }
  
  //Create a mask ImageData of depth 1 (monochrome)
  palette = new PaletteData (new RGB [] {white.getRGB(), black.getRGB(),});
  ImageData maskData = new ImageData (20, 20, 1, palette);
  for (int i = 0; i < 20; i ++) {
    for (int j = 0; j < 10; j++) {
      maskData.setPixel(i, j, 1);
    }
  }
  //Create cursor
  Cursor cursor = new Cursor(display, sourceData, maskData, 10, 10);
  
  Shell shell = new Shell(display);
  final Image source = new Image (display,sourceData);
  final Image mask = new Image (display, maskData);
  //Draw source and mask just to show what they look like
  shell.addPaintListener(new PaintListener() {
    public void paintControl(PaintEvent e) {
      GC gc = e.gc;
      gc.drawString("source: ", 10, 10);
      gc.drawImage(source, 0, 0, 20, 20, 50, 10, 20, 20);
      gc.drawString("mask: ",10, 40);
      gc.drawImage(mask, 0, 0, 20, 20, 50, 40, 20, 20);
    }
  });
  shell.setSize(150, 150);
  shell.open();
  shell.setCursor(cursor);
  
  while (!shell.isDisposed()) {
    if (!display.readAndDispatch())
      display.sleep();
  }
  cursor.dispose();
  source.dispose();
  mask.dispose();
  display.dispose();
}
}

Cursor: set the hand cursor into a control

/*
 * Cursor example snippet: set the hand cursor into a control
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
public class Snippet44 {
  public static void main(String[] args) {
    Display display = new Display();
    final Cursor cursor = new Cursor(display, SWT.CURSOR_HAND);
    Shell shell = new Shell(display);
    shell.open();
    final Button b = new Button(shell, 0);
    b.setBounds(10, 10, 200, 200);
    b.addListener(SWT.Selection, new Listener() {
      public void handleEvent(Event e) {
        b.setCursor(cursor);
      }
    });
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    display.dispose();
  }
}

display busy cursor during long running task

/*
 * BusyIndicator example snippet: display busy cursor during long running task
 *
 * For a list of all SWT example snippets see
 * http://dev.eclipse.org/viewcvs/index.cgi/%7Echeckout%7E/platform-swt-home/dev.html#snippets
 */
import org.eclipse.swt.SWT;
import org.eclipse.swt.custom.BusyIndicator;
import org.eclipse.swt.events.SelectionAdapter;
import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.layout.GridData;
import org.eclipse.swt.layout.GridLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Text;
public class Snippet130 {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setLayout(new GridLayout());
    final Text text = new Text(shell, SWT.MULTI | SWT.BORDER | SWT.V_SCROLL);
    text.setLayoutData(new GridData(GridData.FILL_BOTH));
    final int[] nextId = new int[1];
    Button b = new Button(shell, SWT.PUSH);
    b.setText("invoke long running job");
    b.addSelectionListener(new SelectionAdapter() {
      public void widgetSelected(SelectionEvent e) {
        Runnable longJob = new Runnable() {
          boolean done = false;
          int id;
          public void run() {
            Thread thread = new Thread(new Runnable() {
              public void run() {
                id = nextId[0]++;
                display.syncExec(new Runnable() {
                  public void run() {
                    if (text.isDisposed())
                      return;
                    text
                        .append("\nStart long running task "
                            + id);
                  }
                });
                for (int i = 0; i < 100000; i++) {
                  if (display.isDisposed())
                    return;
                  System.out
                      .println("do task that takes a long time in a separate thread "
                          + id);
                }
                if (display.isDisposed())
                  return;
                display.syncExec(new Runnable() {
                  public void run() {
                    if (text.isDisposed())
                      return;
                    text
                        .append("\nCompleted long running task "
                            + id);
                  }
                });
                done = true;
                display.wake();
              }
            });
            thread.start();
            while (!done && !shell.isDisposed()) {
              if (!display.readAndDispatch())
                display.sleep();
            }
          }
        };
        BusyIndicator.showWhile(display, longJob);
      }
    });
    shell.setSize(250, 150);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    display.dispose();
  }
}