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/*******************************************************************************
* Copyright (c) 2004, 2008 John Krasnay 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:
* John Krasnay - initial API and implementation
*******************************************************************************/
package org.eclipse.vex.core.internal.core;
/**
* Represents a device that can display graphics. This class is subclassed for each target system.
*/
public abstract class DisplayDevice {
public static final DisplayDevice NULL = new DisplayDevice() {
@Override
public int getHorizontalPPI() {
return 0;
}
@Override
public int getVerticalPPI() {
return 0;
}
};
/**
* Class constructor.
*/
public DisplayDevice() {
}
/**
* Returns the current display device.
*/
public static DisplayDevice getCurrent() {
return current;
}
/**
* Returns the horizontal resolution of the device, in pixels-per-inch.
*/
public abstract int getHorizontalPPI();
/**
* Returns the horizontal resolution of the device, in pixels-per-inch.
*/
public abstract int getVerticalPPI();
/**
* Sets the current display device. This is typically called by the platform-specific widget;
*
* @param current
* The device to use as the current device.
*/
public static void setCurrent(final DisplayDevice current) {
DisplayDevice.current = current;
}
// ======================================================= PRIVATE
private static DisplayDevice current = NULL;
}
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