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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.awt.*;
	import java.awt.event.*;
	import java.beans.*;
	import java.util.*;
	import javax.swing.*;
	import javax.swing.plaf.*;
	import javax.swing.plaf.basic.*;


	/**
	* Provides the Synth L&F UI delegate for
	* {@link javax.swing.JSplitPane}.
	*
	* @author Scott Violet
	* @since 1.7
	*/
	public class SynthSplitPaneUI extends BasicSplitPaneUI
	implements PropertyChangeListener, SynthUI {
	/**
	* Keys to use for forward focus traversal when the JComponent is
	* managing focus.
	*/
	private static Set<KeyStroke> managingFocusForwardTraversalKeys;

	/**
	* Keys to use for backward focus traversal when the JComponent is
	* managing focus.
	*/
	private static Set<KeyStroke> managingFocusBackwardTraversalKeys;

	/**
	* Style for the JSplitPane.
	*/
	private SynthStyle style;
	/**
	* Style for the divider.
	*/
	private SynthStyle dividerStyle;


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

	/**
	* Installs the UI defaults.
	*/
	@Override
	protected void installDefaults() {
	updateStyle(splitPane);

	setOrientation(splitPane.getOrientation());
	setContinuousLayout(splitPane.isContinuousLayout());

	resetLayoutManager();

	/* Install the nonContinuousLayoutDivider here to avoid having to
	add/remove everything later. */
	if(nonContinuousLayoutDivider == null) {
	setNonContinuousLayoutDivider(
	createDefaultNonContinuousLayoutDivider(),
	true);
	} else {
	setNonContinuousLayoutDivider(nonContinuousLayoutDivider, true);
	}

	// focus forward traversal key
	if (managingFocusForwardTraversalKeys==null) {
	managingFocusForwardTraversalKeys = new HashSet<KeyStroke>();
	managingFocusForwardTraversalKeys.add(
	KeyStroke.getKeyStroke(KeyEvent.VK_TAB, 0));
	}
	splitPane.setFocusTraversalKeys(KeyboardFocusManager.FORWARD_TRAVERSAL_KEYS,
	managingFocusForwardTraversalKeys);
	// focus backward traversal key
	if (managingFocusBackwardTraversalKeys==null) {
	managingFocusBackwardTraversalKeys = new HashSet<KeyStroke>();
	managingFocusBackwardTraversalKeys.add(
	KeyStroke.getKeyStroke(KeyEvent.VK_TAB, InputEvent.SHIFT_MASK));
	}
	splitPane.setFocusTraversalKeys(KeyboardFocusManager.BACKWARD_TRAVERSAL_KEYS,
	managingFocusBackwardTraversalKeys);
	}

	private void updateStyle(JSplitPane splitPane) {
	SynthContext context = getContext(splitPane, Region.SPLIT_PANE_DIVIDER,
	ENABLED);
	SynthStyle oldDividerStyle = dividerStyle;
	dividerStyle = SynthLookAndFeel.updateStyle(context, this);
	context.dispose();

	context = getContext(splitPane, ENABLED);
	SynthStyle oldStyle = style;

	style = SynthLookAndFeel.updateStyle(context, this);

	if (style != oldStyle) {
	Object value = style.get(context, "SplitPane.size");
	if (value == null) {
	value = Integer.valueOf(6);
	}
	LookAndFeel.installProperty(splitPane, "dividerSize", value);

	value = style.get(context, "SplitPane.oneTouchExpandable");
	if (value != null) {
	LookAndFeel.installProperty(splitPane, "oneTouchExpandable", value);
	}

	if (divider != null) {
	splitPane.remove(divider);
	divider.setDividerSize(splitPane.getDividerSize());
	}
	if (oldStyle != null) {
	uninstallKeyboardActions();
	installKeyboardActions();
	}
	}
	if (style != oldStyle \|\| dividerStyle != oldDividerStyle) {
	// Only way to force BasicSplitPaneDivider to reread the
	// necessary properties.
	if (divider != null) {
	splitPane.remove(divider);
	}
	divider = createDefaultDivider();
	divider.setBasicSplitPaneUI(this);
	splitPane.add(divider, JSplitPane.DIVIDER);
	}
	context.dispose();
	}

	/**
	* Installs the event listeners for the UI.
	*/
	@Override
	protected void installListeners() {
	super.installListeners();
	splitPane.addPropertyChangeListener(this);
	}

	/**
	* Uninstalls the UI defaults.
	*/
	@Override
	protected void uninstallDefaults() {
	SynthContext context = getContext(splitPane, ENABLED);

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

	context = getContext(splitPane, Region.SPLIT_PANE_DIVIDER, ENABLED);
	dividerStyle.uninstallDefaults(context);
	context.dispose();
	dividerStyle = null;

	super.uninstallDefaults();
	}


	/**
	* Uninstalls the event listeners from the UI.
	*/
	@Override
	protected void uninstallListeners() {
	super.uninstallListeners();
	splitPane.removePropertyChangeListener(this);
	}

	/**
	* {@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);
	}

	SynthContext getContext(JComponent c, Region region) {
	return getContext(c, region, getComponentState(c, region));
	}

	private SynthContext getContext(JComponent c, Region region, int state) {
	if (region == Region.SPLIT_PANE_DIVIDER) {
	return SynthContext.getContext(c, region, dividerStyle, state);
	}
	return SynthContext.getContext(c, region, style, state);
	}

	private int getComponentState(JComponent c, Region subregion) {
	int state = SynthLookAndFeel.getComponentState(c);

	if (divider.isMouseOver()) {
	state \|= MOUSE_OVER;
	}
	return state;
	}

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

	/**
	* Creates the default divider.
	*/
	@Override
	public BasicSplitPaneDivider createDefaultDivider() {
	SynthSplitPaneDivider divider = new SynthSplitPaneDivider(this);

	divider.setDividerSize(splitPane.getDividerSize());
	return divider;
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	protected Component createDefaultNonContinuousLayoutDivider() {
	return new Canvas() {
	public void paint(Graphics g) {
	paintDragDivider(g, 0, 0, getWidth(), getHeight());
	}
	};
	}

	/**
	* 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().paintSplitPaneBackground(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. 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) {
	// This is done to update package private variables in
	// BasicSplitPaneUI
	super.paint(g, splitPane);
	}

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

	private void paintDragDivider(Graphics g, int x, int y, int w, int h) {
	SynthContext context = getContext(splitPane,Region.SPLIT_PANE_DIVIDER);
	context.setComponentState(((context.getComponentState() \| MOUSE_OVER) ^
	MOUSE_OVER) \| PRESSED);
	Shape oldClip = g.getClip();
	g.clipRect(x, y, w, h);
	context.getPainter().paintSplitPaneDragDivider(context, g, x, y, w, h,
	splitPane.getOrientation());
	g.setClip(oldClip);
	context.dispose();
	}

	/**
	* {@inheritDoc}
	*/
	@Override
	public void finishedPaintingChildren(JSplitPane jc, Graphics g) {
	if(jc == splitPane && getLastDragLocation() != -1 &&
	!isContinuousLayout() && !draggingHW) {
	if(jc.getOrientation() == JSplitPane.HORIZONTAL_SPLIT) {
	paintDragDivider(g, getLastDragLocation(), 0, dividerSize - 1,
	splitPane.getHeight() - 1);
	} else {
	paintDragDivider(g, 0, getLastDragLocation(),
	splitPane.getWidth() - 1, dividerSize - 1);
	}
	}
	}
	}

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