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DotsLed.java
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DotsLed.java
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/*******************************************************************************
* Copyright (c) 2019 Akuiteo (http://www.akuiteo.com).
* This program and the accompanying materials
* are made available under the terms of the Eclipse Public License 2.0
* which accompanies this distribution, and is available at
* https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
*
* Contributors:
* Laurent CARON (laurent.caron at gmail dot com) - initial API and implementation
* Frank DELPORTE - inspiration for his LED Number Display JavaFX widget
* (https://webtechie.be/2019/10/02/led-number-display-javafx-library-published-to-maven)
*******************************************************************************/
package org.eclipse.nebula.widgets.led;
import org.eclipse.swt.SWT;
import org.eclipse.swt.SWTException;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Composite;
/**
* Instances of this class represent a non-selectable user interface object that
* displays a double-dots character like it was displayed on a LED screen.
*
* <dl>
* <dt><b>Styles:</b></dt>
* <dd>SWT.BORDER</dd>
* <dt><b>Events:</b></dt>
* <dd>(none)</dd>
* </dl>
*/
public class DotsLed extends BaseLED {
private boolean areDotsLight;
/**
* Constructs a new instance of this class given its parent and a style value
* describing its behavior and appearance.
* <p>
* The style value is either one of the style constants defined in class
* <code>SWT</code> which is applicable to instances of this class, or must be
* built by <em>bitwise OR</em>'ing together (that is, using the
* <code>int</code> "|" operator) two or more of those <code>SWT</code> style
* constants. The class description lists the style constants that are
* applicable to the class. Style bits are also inherited from superclasses.
* </p>
*
* @param parent
* a composite control which will be the parent of the new instance
* (cannot be null)
* @param style
* the style of control to construct
*
* @exception IllegalArgumentException
* <ul>
* <li>ERROR_NULL_ARGUMENT - if the parent is null</li>
* </ul>
* @exception SWTException
* <ul>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the parent</li>
* <li>ERROR_INVALID_SUBCLASS - if this class is not an allowed
* subclass</li>
* </ul>
*
*/
public DotsLed(Composite parent, int style) {
super(parent, checkStyle(style));
}
private static int checkStyle(final int style) {
final int mask = SWT.BORDER;
int newStyle = style & mask;
newStyle |= SWT.DOUBLE_BUFFERED;
return newStyle;
}
/**
* @see org.eclipse.nebula.widgets.led.BaseLED#paintInternal()
*/
@Override
protected void paintInternal() {
final Rectangle clientArea = getClientArea();
final int x = clientArea.width / 2;
int y = (clientArea.height - 4 * DOT_DIAMETER) / 2;
gc.setBackground(areDotsLight ? selectedColor : idleColor);
gc.fillOval(x, y, DOT_DIAMETER, DOT_DIAMETER);
y += 2 * DOT_DIAMETER;
gc.fillOval(x, y, DOT_DIAMETER, DOT_DIAMETER);
}
/**
* @see org.eclipse.swt.widgets.Control#computeSize(int, int, boolean)
*/
@Override
public Point computeSize(int wHint, int hHint, boolean changed) {
int x = (wHint == SWT.DEFAULT) ? BaseLED.THIN_DEFAULT_WIDTH : wHint;
int y = (hHint == SWT.DEFAULT) ? BaseLED.DEFAULT_HEIGHT : hHint;
return new Point(x, y);
}
/**
* Switch on the two dots
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void switchOn() {
checkWidget();
areDotsLight = true;
redraw();
}
/**
* Switch off the two dots
*
* @exception SWTException
* <ul>
* <li>ERROR_WIDGET_DISPOSED - if the receiver has been
* disposed</li>
* <li>ERROR_THREAD_INVALID_ACCESS - if not called from the
* thread that created the receiver</li>
* </ul>
*/
public void switchOff() {
checkWidget();
areDotsLight = false;
redraw();
}
}