ColorLayerUI.java

/*******************************************************************************
 * Copyright (c) 2016 Weasis Team 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:
 *     Nicolas Roduit - initial API and implementation
 *******************************************************************************/
package org.weasis.core.ui.util;

import java.awt.AlphaComposite;
import java.awt.Component;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.Graphics2D;
import java.awt.Point;
import java.awt.Window;

import javax.swing.JComponent;
import javax.swing.RootPaneContainer;
import javax.swing.Timer;

import org.jdesktop.jxlayer.JXLayer;
import org.jdesktop.jxlayer.plaf.AbstractLayerUI;
import org.weasis.core.api.gui.util.JMVUtils;
import org.weasis.core.api.gui.util.WinUtil;

@SuppressWarnings("serial")
public class ColorLayerUI extends AbstractLayerUI<JComponent> {

    protected static final float MAX_ALPHA = 0.75f;

    private final RootPaneContainer parent;
    protected final JXLayer<JComponent> xlayer;
    protected volatile float alpha;

    public ColorLayerUI(final JXLayer<JComponent> comp, RootPaneContainer parent) {
        if (parent == null || comp == null) {
            throw new IllegalArgumentException();
        }
        this.parent = parent;
        this.xlayer = comp;
    }

    public static ColorLayerUI createTransparentLayerUI(RootPaneContainer parent) {
        if (parent != null) {
            JXLayer<JComponent> layer = new JXLayer(parent.getContentPane());
            final ColorLayerUI ui = new ColorLayerUI(layer, parent);
            layer.setUI(ui);
            parent.setContentPane(layer);
            ui.showUI();
            return ui;
        }
        return null;
    }

    public static ColorLayerUI createTransparentLayerUI(Component parent) {
        if (parent != null) {
            return createTransparentLayerUI(WinUtil.getRootPaneContainer(parent));
        }
        return null;
    }

    public static void showCenterScreen(Window window, ColorLayerUI layer) {
        Container container = getContentPane(layer);
        if (container == null) {
            JMVUtils.showCenterScreen(window);
        } else {
            Dimension sSize = container.getSize();
            Dimension wSize = window.getSize();
            Point p = container.getLocationOnScreen();
            window.setLocation(p.x + ((sSize.width - wSize.width) / 2), p.y + ((sSize.height - wSize.height) / 2));
            window.setVisible(true);

            layer.hideUI();
        }
    }

    @Override
    protected void paintLayer(final Graphics2D g, final JXLayer<? extends JComponent> comp) {
        super.paintLayer(g, this.xlayer);
        g.setColor(comp.getBackground());
        g.setComposite(AlphaComposite.SrcOver.derive(alpha * MAX_ALPHA));
        g.fillRect(0, 0, comp.getWidth(), comp.getHeight());
    }

    public synchronized void showUI() {
        this.alpha = 0.0f;
        final Timer timer = new Timer(3, null);
        timer.setRepeats(true);
        timer.addActionListener(e -> {
            alpha = Math.min(alpha + 0.1f, 1.0F);
            if (alpha >= 1.0) {
                timer.stop();
            }
            xlayer.repaint();
        });
        this.xlayer.repaint();
        timer.start();

    }

    public synchronized void hideUI() {
        this.alpha = 1.0f;
        final Timer timer = new Timer(3, null);
        timer.setRepeats(true);
        timer.addActionListener(e -> {
            alpha = Math.max(alpha - 0.1f, 0.0F);
            if (alpha <= 0.0) {
                timer.stop();
                parent.setContentPane(xlayer.getView());
                return;
            }
            xlayer.repaint();
        });
        this.xlayer.repaint();
        timer.start();

    }

    public JXLayer<JComponent> getXlayer() {
        return xlayer;
    }

    public static Container getContentPane(ColorLayerUI layer) {
        if (layer != null && layer.parent != null) {
            return layer.parent.getRootPane();
        }
        return null;
    }

}