Returns whether the given level of translucency is supported by the underlying system.

Description

Demo Code

/*/*from w ww. j a v  a  2s. c  o m*/
 * Copyright (c) 2008, 2017, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */
import java.awt.*;
import javax.swing.JRootPane;
import sun.awt.AWTAccessor;
import sun.awt.SunToolkit;

public class Main{
    /**
     * Returns whether the given level of translucency is supported by
     * the underlying system.
     *
     * Note that this method may sometimes return the value
     * indicating that the particular level is supported, but
     * the native windowing system may still not support the
     * given level of translucency (due to the bugs in
     * the windowing system).
     *
     * @param translucencyKind a kind of translucency support
     *                         (either PERPIXEL_TRANSPARENT,
     *                         TRANSLUCENT, or PERPIXEL_TRANSLUCENT)
     * @return whether the given translucency kind is supported
     */
    public static boolean isTranslucencySupported(
            Translucency translucencyKind) {
        switch (translucencyKind) {
        case PERPIXEL_TRANSPARENT:
            return isWindowShapingSupported();
        case TRANSLUCENT:
            return isWindowOpacitySupported();
        case PERPIXEL_TRANSLUCENT:
            return isWindowTranslucencySupported();
        }
        return false;
    }
    /**
     * Returns whether the windowing system supports changing the shape
     * of top-level windows.
     * Note that this method may sometimes return true, but the native
     * windowing system may still not support the concept of
     * shaping (due to the bugs in the windowing system).
     */
    public static boolean isWindowShapingSupported() {
        Toolkit curToolkit = Toolkit.getDefaultToolkit();
        if (!(curToolkit instanceof SunToolkit)) {
            return false;
        }
        return ((SunToolkit) curToolkit).isWindowShapingSupported();
    }
    /**
     * Returns whether the windowing system supports changing the opacity
     * value of top-level windows.
     * Note that this method may sometimes return true, but the native
     * windowing system may still not support the concept of
     * translucency (due to the bugs in the windowing system).
     */
    private static boolean isWindowOpacitySupported() {
        Toolkit curToolkit = Toolkit.getDefaultToolkit();
        if (!(curToolkit instanceof SunToolkit)) {
            return false;
        }
        return ((SunToolkit) curToolkit).isWindowOpacitySupported();
    }
    private static boolean isWindowTranslucencySupported() {
        /*
         * Per-pixel alpha is supported if all the conditions are TRUE:
         *    1. The toolkit is a sort of SunToolkit
         *    2. The toolkit supports translucency in general
         *        (isWindowTranslucencySupported())
         *    3. There's at least one translucency-capable
         *        GraphicsConfiguration
         */

        Toolkit curToolkit = Toolkit.getDefaultToolkit();
        if (!(curToolkit instanceof SunToolkit)) {
            return false;
        }

        if (!((SunToolkit) curToolkit).isWindowTranslucencySupported()) {
            return false;
        }

        GraphicsEnvironment env = GraphicsEnvironment
                .getLocalGraphicsEnvironment();

        // If the default GC supports translucency return true.
        // It is important to optimize the verification this way,
        // see CR 6661196 for more details.
        if (isTranslucencyCapable(env.getDefaultScreenDevice()
                .getDefaultConfiguration())) {
            return true;
        }

        // ... otherwise iterate through all the GCs.
        GraphicsDevice[] devices = env.getScreenDevices();

        for (int i = 0; i < devices.length; i++) {
            GraphicsConfiguration[] configs = devices[i]
                    .getConfigurations();
            for (int j = 0; j < configs.length; j++) {
                if (isTranslucencyCapable(configs[j])) {
                    return true;
                }
            }
        }

        return false;
    }
    /**
     * Verifies whether a given GraphicsConfiguration supports
     * the PERPIXEL_TRANSLUCENT kind of translucency.
     * All windows that are intended to be used with the {@link #setWindowOpaque}
     * method must be created using a GraphicsConfiguration for which this method
     * returns true.
     * <p>Note that some native systems enable the per-pixel translucency
     * mode for any window created using a translucency-capable
     * graphics configuration. However, it is highly recommended to always
     * invoke the setWindowOpaque() method for these windows, at least
     * for the sake of cross-platform compatibility reasons.
     *
     * @param gc GraphicsConfiguration
     * @throws NullPointerException if the gc argument is null
     * @return whether the given GraphicsConfiguration supports
     *         the translucency effects.
     */
    public static boolean isTranslucencyCapable(GraphicsConfiguration gc) {
        if (gc == null) {
            throw new NullPointerException(
                    "The gc argument should not be null");
        }
        /*
        return gc.isTranslucencyCapable();
         */
        Toolkit curToolkit = Toolkit.getDefaultToolkit();
        if (!(curToolkit instanceof SunToolkit)) {
            return false;
        }
        return ((SunToolkit) curToolkit).isTranslucencyCapable(gc);
    }
}
Returns whether the given level of translucency is supported by the underlying system. - Java java.awt

Description

Demo Code

Related Tutorials
