Java Tutorial/SWT/SWT Cursor

Create a color cursor from a source and a mask

/*******************************************************************************
 * 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
 *******************************************************************************/
/*
 * Cursor example snippet: create a color cursor from a source and a mask
 *
 * 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.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 CursorFromSourceMask {
  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();
  }
}

Create a cursor from a source and a mask

/*******************************************************************************
 * 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
 *******************************************************************************/
/*
 * Cursor example snippet: create a cursor from a source and a mask
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/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 CursorFromMask {
  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, 60, 10, 20, 20);
        gc.drawString("mask: ", 10, 40);
        gc.drawImage(mask, 0, 0, 20, 20, 60, 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();
  }
}

Create Cursor from an Image

import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class CursorImageCreate {
  public static void main(String[] args) {
    final Display display = new Display();
    final Shell shell = new Shell(display);
    shell.setSize(150, 150);
    
    Cursor cursor = new Cursor(display, new Image(display,"yourFile.gif").getImageData(), 0, 0);
    shell.setCursor(cursor);
    shell.open();
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    display.dispose();
  }
}

Set Cursor to Control

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.Shell;
public class CursorSetControl {
  public static void main(String[] args) {
    Display display = new Display();
    
    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.setCursor(cursor);
    
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    display.dispose();
  }
}

Use transparent image to hide Cursor

/*******************************************************************************
 * Copyright (c) 2000, 2006 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
 *******************************************************************************/
/* 
 * Cursor snippet: Hide the Cursor over a control.
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/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.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Shell;
public class CursorHideControl {
  public static void main(String[] args) {
    Display display = new Display();
    Shell shell = new Shell(display);
    shell.setBounds(10, 10, 200, 200);
    Canvas canvas = new Canvas(shell, SWT.BORDER);
    canvas.setBounds(10, 50, 150, 100);
    canvas.addPaintListener(new PaintListener() {
      public void paintControl(PaintEvent e) {
        e.gc.drawString("hide Cursor here", 10, 10);
      }
    });
    // create a cursor with a transparent image
    Color white = display.getSystemColor(SWT.COLOR_WHITE);
    Color black = display.getSystemColor(SWT.COLOR_BLACK);
    PaletteData palette = new PaletteData(new RGB[] { white.getRGB(), black.getRGB() });
    ImageData sourceData = new ImageData(16, 16, 1, palette);
    sourceData.transparentPixel = 0;
    Cursor cursor = new Cursor(display, sourceData, 0, 0);
    shell.open();
    canvas.setCursor(cursor);
    while (!shell.isDisposed()) {
      if (!display.readAndDispatch())
        display.sleep();
    }
    cursor.dispose();
    display.dispose();
  }
}