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	/*
	* Copyright (c) 2002, 2013, 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.
	*/

	package javax.swing.plaf.synth;

	import java.beans.*;
	import javax.swing.*;
	import javax.swing.plaf.*;
	import java.awt.*;


	/**
	* Provides the Synth L&F UI delegate for
	* {@link javax.swing.JViewport}.
	*
	* @since 1.7
	*/
	public class SynthViewportUI extends ViewportUI
	implements PropertyChangeListener, SynthUI {
	private SynthStyle style;

	/**
	* Creates a new UI object for the given component.
	*
	* @param c component to create UI object for
	* @return the UI object
	*/
	public static ComponentUI createUI(JComponent c) {
	return new SynthViewportUI();
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void installUI(JComponent c) {
	super.installUI(c);
	installDefaults(c);
	installListeners(c);
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void uninstallUI(JComponent c) {
	super.uninstallUI(c);
	uninstallListeners(c);
	uninstallDefaults(c);
	}

	/**
	* Installs defaults for a viewport.
	*
	* @param c a {@code JViewport} object
	*/
	protected void installDefaults(JComponent c) {
	updateStyle(c);
	}

	private void updateStyle(JComponent c) {
	SynthContext context = getContext(c, ENABLED);

	// Note: JViewport is special cased as it does not allow for
	// a border to be set. JViewport.setBorder is overriden to throw
	// an IllegalArgumentException. Refer to SynthScrollPaneUI for
	// details of this.
	SynthStyle newStyle = SynthLookAndFeel.getStyle(context.getComponent(),
	context.getRegion());
	SynthStyle oldStyle = context.getStyle();

	if (newStyle != oldStyle) {
	if (oldStyle != null) {
	oldStyle.uninstallDefaults(context);
	}
	context.setStyle(newStyle);
	newStyle.installDefaults(context);
	}
	this.style = newStyle;
	context.dispose();
	}

	/**
	* Installs listeners into the viewport.
	*
	* @param c a {@code JViewport} object
	*/
	protected void installListeners(JComponent c) {
	c.addPropertyChangeListener(this);
	}

	/**
	* Uninstalls listeners from the viewport.
	*
	* @param c a {@code JViewport} object
	*/
	protected void uninstallListeners(JComponent c) {
	c.removePropertyChangeListener(this);
	}

	/**
	* Uninstalls defaults from a viewport.
	*
	* @param c a {@code JViewport} object
	*/
	protected void uninstallDefaults(JComponent c) {
	SynthContext context = getContext(c, ENABLED);
	style.uninstallDefaults(context);
	context.dispose();
	style = null;
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public SynthContext getContext(JComponent c) {
	return getContext(c, SynthLookAndFeel.getComponentState(c));
	}

	private SynthContext getContext(JComponent c, int state) {
	return SynthContext.getContext(c, style, state);
	}

	private Region getRegion(JComponent c) {
	return SynthLookAndFeel.getRegion(c);
	}

	/**
	* Notifies this UI delegate to repaint the specified component.
	* This method paints the component background, then calls
	* the {@link #paint(SynthContext,Graphics)} method.
	*
	* <p>In general, this method does not need to be overridden by subclasses.
	* All Look and Feel rendering code should reside in the {@code paint} method.
	*
	* @param g the {@code Graphics} object used for painting
	* @param c the component being painted
	* @see #paint(SynthContext,Graphics)
	*/
	@Override
	public void update(Graphics g, JComponent c) {
	SynthContext context = getContext(c);

	SynthLookAndFeel.update(context, g);
	context.getPainter().paintViewportBackground(context,
	g, 0, 0, c.getWidth(), c.getHeight());
	paint(context, g);
	context.dispose();
	}

	/**
	* Paints the border. The method is never called,
	* because the {@code JViewport} class does not support a border.
	* This implementation does nothing.
	*
	* @param context a component context
	* @param g the {@code Graphics} to paint on
	* @param x the X coordinate
	* @param y the Y coordinate
	* @param w width of the border
	* @param h height of the border
	*/
	@Override
	public void paintBorder(SynthContext context, Graphics g, int x,
	int y, int w, int h) {
	}

	/**
	* Paints the specified component according to the Look and Feel.
	* <p>This method is not used by Synth Look and Feel.
	* Painting is handled by the {@link #paint(SynthContext,Graphics)} method.
	*
	* @param g the {@code Graphics} object used for painting
	* @param c the component being painted
	* @see #paint(SynthContext,Graphics)
	*/
	@Override
	public void paint(Graphics g, JComponent c) {
	SynthContext context = getContext(c);

	paint(context, g);
	context.dispose();
	}

	/**
	* Paints the specified component. This implementation does nothing.
	*
	* @param context context for the component being painted
	* @param g the {@code Graphics} object used for painting
	* @see #update(Graphics,JComponent)
	*/
	protected void paint(SynthContext context, Graphics g) {
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void propertyChange(PropertyChangeEvent e) {
	if (SynthLookAndFeel.shouldUpdateStyle(e)) {
	updateStyle((JComponent)e.getSource());
	}
	}
	}

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