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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 javax.swing.*;
	import javax.swing.text.JTextComponent;
	import javax.swing.border.*;
	import javax.swing.plaf.*;
	import javax.swing.plaf.basic.*;

	import java.beans.PropertyChangeListener;
	import java.beans.PropertyChangeEvent;

	import java.awt.*;
	import java.awt.event.ContainerListener;
	import java.awt.event.ContainerEvent;
	import java.awt.event.FocusListener;
	import java.awt.event.FocusEvent;

	/**
	* Provides the Synth L&F UI delegate for
	* {@link javax.swing.JScrollPane}.
	*
	* @author Scott Violet
	* @since 1.7
	*/
	public class SynthScrollPaneUI extends BasicScrollPaneUI
	implements PropertyChangeListener, SynthUI {
	private SynthStyle style;
	private boolean viewportViewHasFocus = false;
	private ViewportViewFocusHandler viewportViewFocusHandler;

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

	/**
	* 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().paintScrollPaneBackground(context,
	g, 0, 0, c.getWidth(), c.getHeight());
	paint(context, g);
	context.dispose();
	}

	/**
	* 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.
	*
	* @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) {
	Border vpBorder = scrollpane.getViewportBorder();
	if (vpBorder != null) {
	Rectangle r = scrollpane.getViewportBorderBounds();
	vpBorder.paintBorder(scrollpane, g, r.x, r.y, r.width, r.height);
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void paintBorder(SynthContext context, Graphics g, int x,
	int y, int w, int h) {
	context.getPainter().paintScrollPaneBorder(context, g, x, y, w, h);
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void installDefaults(JScrollPane scrollpane) {
	updateStyle(scrollpane);
	}

	private void updateStyle(JScrollPane c) {
	SynthContext context = getContext(c, ENABLED);
	SynthStyle oldStyle = style;

	style = SynthLookAndFeel.updateStyle(context, this);
	if (style != oldStyle) {
	Border vpBorder = scrollpane.getViewportBorder();
	if ((vpBorder == null) \|\|( vpBorder instanceof UIResource)) {
	scrollpane.setViewportBorder(new ViewportBorder(context));
	}
	if (oldStyle != null) {
	uninstallKeyboardActions(c);
	installKeyboardActions(c);
	}
	}
	context.dispose();
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void installListeners(JScrollPane c) {
	super.installListeners(c);
	c.addPropertyChangeListener(this);
	if (UIManager.getBoolean("ScrollPane.useChildTextComponentFocus")){
	viewportViewFocusHandler = new ViewportViewFocusHandler();
	c.getViewport().addContainerListener(viewportViewFocusHandler);
	Component view = c.getViewport().getView();
	if (view instanceof JTextComponent) {
	view.addFocusListener(viewportViewFocusHandler);
	}
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void uninstallDefaults(JScrollPane c) {
	SynthContext context = getContext(c, ENABLED);

	style.uninstallDefaults(context);
	context.dispose();

	if (scrollpane.getViewportBorder() instanceof UIResource) {
	scrollpane.setViewportBorder(null);
	}
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected void uninstallListeners(JComponent c) {
	super.uninstallListeners(c);
	c.removePropertyChangeListener(this);
	if (viewportViewFocusHandler != null) {
	JViewport viewport = ((JScrollPane) c).getViewport();
	viewport.removeContainerListener(viewportViewFocusHandler);
	if (viewport.getView()!= null) {
	viewport.getView().removeFocusListener(viewportViewFocusHandler);
	}
	viewportViewFocusHandler = null;
	}
	}

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

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

	private int getComponentState(JComponent c) {
	int baseState = SynthLookAndFeel.getComponentState(c);
	if (viewportViewFocusHandler!=null && viewportViewHasFocus){
	baseState = baseState \| FOCUSED;
	}
	return baseState;
	}

	public void propertyChange(PropertyChangeEvent e) {
	if (SynthLookAndFeel.shouldUpdateStyle(e)) {
	updateStyle(scrollpane);
	}
	}



	private class ViewportBorder extends AbstractBorder implements UIResource {
	private Insets insets;

	ViewportBorder(SynthContext context) {
	this.insets = (Insets)context.getStyle().get(context,
	"ScrollPane.viewportBorderInsets");
	if (this.insets == null) {
	this.insets = SynthLookAndFeel.EMPTY_UIRESOURCE_INSETS;
	}
	}

	@Override
	public void paintBorder(Component c, Graphics g, int x, int y,
	int width, int height) {
	JComponent jc = (JComponent)c;
	SynthContext context = getContext(jc);
	SynthStyle style = context.getStyle();
	if (style == null) {
	assert false: "SynthBorder is being used outside after the " +
	" UI has been uninstalled";
	return;
	}
	context.getPainter().paintViewportBorder(context, g, x, y, width,
	height);
	context.dispose();
	}

	@Override
	public Insets getBorderInsets(Component c, Insets insets) {
	if (insets == null) {
	return new Insets(this.insets.top, this.insets.left,
	this.insets.bottom, this.insets.right);
	}
	insets.top = this.insets.top;
	insets.bottom = this.insets.bottom;
	insets.left = this.insets.left;
	insets.right = this.insets.left;
	return insets;
	}

	@Override
	public boolean isBorderOpaque() {
	return false;
	}
	}

	/**
	* Handle keeping track of the viewport's view's focus
	*/
	private class ViewportViewFocusHandler implements ContainerListener,
	FocusListener{
	public void componentAdded(ContainerEvent e) {
	if (e.getChild() instanceof JTextComponent) {
	e.getChild().addFocusListener(this);
	viewportViewHasFocus = e.getChild().isFocusOwner();
	scrollpane.repaint();
	}
	}

	public void componentRemoved(ContainerEvent e) {
	if (e.getChild() instanceof JTextComponent) {
	e.getChild().removeFocusListener(this);
	}
	}

	public void focusGained(FocusEvent e) {
	viewportViewHasFocus = true;
	scrollpane.repaint();
	}

	public void focusLost(FocusEvent e) {
	viewportViewHasFocus = false;
	scrollpane.repaint();
	}
	}
	}

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