/*
 * Copyright (c) 2010, 2018, 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 javafx.scene.control;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;

import javafx.application.Application;
import javafx.beans.property.DoubleProperty;
import javafx.beans.property.DoublePropertyBase;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.ObjectPropertyBase;
import javafx.beans.property.StringProperty;
import javafx.beans.value.WritableValue;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.collections.ObservableSet;
import javafx.css.CssParser;
import javafx.scene.Node;
import javafx.scene.Parent;
import javafx.scene.Scene;
import javafx.scene.layout.Pane;
import javafx.stage.PopupWindow;
import com.sun.javafx.application.PlatformImpl;
import javafx.css.CssMetaData;
import javafx.css.PseudoClass;
import com.sun.javafx.css.StyleManager;
import com.sun.javafx.scene.NodeHelper;
import com.sun.javafx.scene.ParentHelper;
import javafx.css.Styleable;
import javafx.css.StyleableStringProperty;
import javafx.css.converter.StringConverter;
import com.sun.javafx.scene.control.Logging;
import com.sun.javafx.scene.layout.PaneHelper;
import com.sun.javafx.stage.PopupWindowHelper;
import javafx.css.StyleableProperty;
import javafx.stage.Window;
import com.sun.javafx.logging.PlatformLogger;
import com.sun.javafx.logging.PlatformLogger.Level;

/**
 * An extension of PopupWindow that allows for CSS styling.
 * @since JavaFX 2.0
 */
public class PopupControl extends PopupWindow implements Skinnable, Styleable {

    /**
     * Sentinel value which can be passed to a control's setMinWidth(), setMinHeight(),
     * setMaxWidth() or setMaxHeight() methods to indicate that the preferred dimension
     * should be used for that max and/or min constraint.
     */
    public static final double USE_PREF_SIZE = Double.NEGATIVE_INFINITY;

     /**
      * Sentinel value which can be passed to a control's setMinWidth(), setMinHeight(),
      * setPrefWidth(), setPrefHeight(), setMaxWidth(), setMaxHeight() methods
      * to reset the control's size constraint back to it's intrinsic size returned
      * by computeMinWidth(), computeMinHeight(), computePrefWidth(), computePrefHeight(),
      * computeMaxWidth(), or computeMaxHeight().
      */
    public static final double USE_COMPUTED_SIZE = -1;

    static {
        // Ensures that the default application user agent stylesheet is loaded
        if (Application.getUserAgentStylesheet() == null) {
            PlatformImpl.setDefaultPlatformUserAgentStylesheet();
        }
    }

    /**
     * We need a special root node, except we can't replace the special
     * root node already in the PopupControl. So we'll set our own
     * special almost-root node that is a child of the root.
     *
     * This special root node is responsible for mapping the id, styleClass,
     * and style defined on the PopupControl such that CSS will read the
     * values from the PopupControl, and then apply CSS state to that
     * special node. The node will then be able to pass cssSet calls
     * along, such that any subclass of PopupControl will be able to
     * use the Styleable properties  and we'll be able to style it from
     * CSS, in such a way that it participates and applies to the skin,
     * exactly the way that normal Skin's work for normal Controls.
     * @since JavaFX 2.1
     */
    protected CSSBridge bridge;

    /**
     * Create a new empty PopupControl.
     */
    public PopupControl() {
        super();
        this.bridge = new CSSBridge();
        setAnchorLocation(AnchorLocation.CONTENT_TOP_LEFT);
        PopupWindowHelper.getContent(this).add(bridge);
    }

    // TODO the fact that PopupWindow uses a group for auto-moving things
    // around means that the scene resize semantics don't work if the
    // child is a resizable. I will need to replicate those semantics
    // here sometime, such that if the Skin provides a resizable, it is
    // given to match the popup window's width & height.

    /**
     * The id of this {@code PopupControl}. This simple string identifier is useful for
     * finding a specific Node within the scene graph. While the id of a Node
     * should be unique within the scene graph, this uniqueness is not enforced.
     * This is analogous to the "id" attribute on an HTML element
     * (<a href="http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier">CSS ID Specification</a>).
     *
     * @return the id property
     * @defaultValue null
     */
    public final StringProperty idProperty() { return bridge.idProperty(); }

    /**
     * Sets the id of this {@code PopupControl}. This simple string identifier is useful for
     * finding a specific Node within the scene graph. While the id of a Node
     * should be unique within the scene graph, this uniqueness is not enforced.
     * This is analogous to the "id" attribute on an HTML element
     * (<a href="http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier">CSS ID Specification</a>).
     *
     * @param value  the id assigned to this {@code PopupControl} using the {@code setId}
     *         method or {@code null}, if no id has been assigned.
     * @defaultValue null
     */
    public final void setId(String value) { idProperty().set(value); }

    /**
     * The id of this {@code PopupControl}. This simple string identifier is useful for
     * finding a specific Node within the scene graph. While the id of a Node
     * should be unique within the scene graph, this uniqueness is not enforced.
     * This is analogous to the "id" attribute on an HTML element
     * (<a href="http://www.w3.org/TR/CSS21/syndata.html#value-def-identifier">CSS ID Specification</a>).
     *
     * @return the id assigned to this {@code PopupControl} using the {@code setId}
     *         method or {@code null}, if no id has been assigned.
     * @defaultValue null
     */
    @Override public final String getId() { return idProperty().get(); }

    /**
     * Returns the list of String identifiers that make up the styleClass
     * for this PopupControl.
     */
    @Override public final ObservableList<String> getStyleClass() { return bridge.getStyleClass(); }

    /**
     * A string representation of the CSS style associated with this
     * specific {@code PopupControl}. This is analogous to the "style" attribute of an
     * HTML element. Note that, like the HTML style attribute, this
     * variable contains style properties and values and not the
     * selector portion of a style rule.
     * @param value The inline CSS style to use for this {@code PopupControl}.
     *         {@code null} is implicitly converted to an empty String.
     * @defaultValue empty string
     */
    public final void setStyle(String value) { styleProperty().set(value); }

    // TODO: javadoc copied from property for the sole purpose of providing a return tag
    /**
     * A string representation of the CSS style associated with this
     * specific {@code PopupControl}. This is analogous to the "style" attribute of an
     * HTML element. Note that, like the HTML style attribute, this
     * variable contains style properties and values and not the
     * selector portion of a style rule.
     * @defaultValue empty string
     * @return The inline CSS style associated with this {@code PopupControl}.
     *         If this {@code PopupControl} does not have an inline style,
     *         an empty String is returned.
     */
    @Override public final String getStyle() { return styleProperty().get(); }
    public final StringProperty styleProperty() { return bridge.styleProperty(); }

    /**
     * Skin is responsible for rendering this {@code PopupControl}. From the
     * perspective of the {@code PopupControl}, the {@code Skin} is a black box.
     * It listens and responds to changes in state in a {@code PopupControl}.
     * <p>
     * There is a one-to-one relationship between a {@code PopupControl} and its
     * {@code Skin}. Every {@code Skin} maintains a back reference to the
     * {@code PopupControl}.
     * <p>
     * A skin may be null.
     */
    @Override public final ObjectProperty<Skin<?>> skinProperty() {
        return skin;
    }

    @Override public final void setSkin(Skin<?> value) {
        skinProperty().setValue(value);
    }

    @Override public final Skin<?> getSkin() {
        return skinProperty().getValue();
    }

    private final ObjectProperty<Skin<?>> skin = new ObjectPropertyBase<Skin<?>>() {
        // We store a reference to the oldValue so that we can handle
        // changes in the skin properly in the case of binding. This is
        // only needed because invalidated() does not currently take
        // a reference to the old value.
        private Skin<?> oldValue;

        @Override
        public void set(Skin<?> v) {

            if (v == null
                    ? oldValue == null
                    : oldValue != null && v.getClass().equals(oldValue.getClass()))
                return;

            super.set(v);

        }

        @Override protected void invalidated() {
            Skin<?> skin = get();

            // Collect the name of the currently installed skin class. We do this
            // so that subsequent updates from CSS to the same skin class will not
            // result in reinstalling the skin
            currentSkinClassName = skin == null ? null : skin.getClass().getName();

            // if someone calls setSkin, we need to make it look like they
            // called set on skinClassName in order to keep CSS from overwriting
            // the skin.
            skinClassNameProperty().set(currentSkinClassName);

            // Let CSS know that this property has been manually changed
            // Dispose of the old skin
            if (oldValue != null) {
                oldValue.dispose();
            }

            // Get the new value, and save it off as the new oldValue
            oldValue = getValue();

            prefWidthCache = -1;
            prefHeightCache = -1;
            minWidthCache = -1;
            minHeightCache = -1;
            maxWidthCache = -1;
            maxHeightCache = -1;
            skinSizeComputed = false;

            final Node n = getSkinNode();
            if (n != null) {
                bridge.getChildren().setAll(n);
            } else {
                bridge.getChildren().clear();
            }

            // calling NodeHelper.reapplyCSS() as the styleable properties may now
            // be different, as we will now be able to return styleable properties
            // belonging to the skin. If NodeHelper.reapplyCSS() is not called, the
            // getCssMetaData() method is never called, so the
            // skin properties are never exposed.
            NodeHelper.reapplyCSS(bridge);

            // DEBUG: Log that we've changed the skin
            final PlatformLogger logger = Logging.getControlsLogger();
            if (logger.isLoggable(Level.FINEST)) {
                logger.finest("Stored skin[" + getValue() + "] on " + this);
            }
        }

        @Override
        public Object getBean() {
            return PopupControl.this;
        }

        @Override
        public String getName() {
            return "skin";
        }
    };
    /**
     * Keeps a reference to the name of the class currently acting as the skin.
     */
    private String currentSkinClassName = null;
    /**
     * A property that acts as a proxy between the skin property and css.
     */
    private StringProperty skinClassName = null;
    private StringProperty skinClassNameProperty() {
        if (skinClassName == null) {
            skinClassName = new StyleableStringProperty() {

                @Override
                public void set(String v) {
                    // do not allow the skin to be set to null through CSS
                    if (v == null || v.isEmpty() || v.equals(get())) return;
                    super.set(v);
                }

                @Override
                public void invalidated() {

                    //
                    // if the current skin is not null, then
                    // see if then check to see if the current skin's class name
                    // is the same as skinClassName. If it is, then there is
                    // no need to load the skin class. Note that the only time
                    // this would be the case is if someone called setSkin since
                    // the skin would be set ahead of the skinClassName
                    // (skinClassName is set from the skinProperty's invalidated
                    // method, so the skin would be set, then the skinClassName).
                    // If the skinClassName is set first (via CSS), then this
                    // invalidated method won't get called unless the value
                    // has changed (thus, we won't reload the same skin).
                    //
                    if (get() != null) {
                        if (!get().equals(currentSkinClassName)) {
                            Control.loadSkinClass(PopupControl.this, get());
                        }
                        // CSS should not set skin to null
                        //                    } else {
                        //                        setSkin(null);
                    }
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "skinClassName";
                }

                @Override
                public CssMetaData<CSSBridge,String> getCssMetaData() {
                    return SKIN;
                }

            };
        }
        return skinClassName;
    }

    /**
     * Gets the Skin's node, or returns null if there is no Skin.
     * Convenience method for getting the node of the skin. This is null-safe,
     * meaning if skin is null then it will return null instead of throwing
     * a NullPointerException.
     *
     * @return The Skin's node, or null.
     */
    private Node getSkinNode() {
        return getSkin() == null ? null : getSkin().getNode();
    }

    /**
     * Property for overriding the control's computed minimum width.
     * This should only be set if the control's internally computed minimum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinWidth(forHeight)</code> will return the control's internally
     * computed minimum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     */
    private DoubleProperty minWidth;

    /**
     * Property for overriding the control's computed minimum width.
     * This should only be set if the control's internally computed minimum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinWidth(forHeight)</code> will return the control's internally
     * computed minimum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     * @param value the minimum width
     */
    public final void setMinWidth(double value) { minWidthProperty().set(value); }

    /**
     * Property for overriding the control's computed minimum width.
     * This should only be set if the control's internally computed minimum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinWidth(forHeight)</code> will return the control's internally
     * computed minimum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     * @return the minimum width
     */
    public final double getMinWidth() { return minWidth == null ? USE_COMPUTED_SIZE : minWidth.get(); }
    public final DoubleProperty minWidthProperty() {
        if (minWidth == null) {
            minWidth = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "minWidth";
                }
            };
        }
        return minWidth;
    }


    /**
     * Property for overriding the control's computed minimum height.
     * This should only be set if the control's internally computed minimum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinHeight(forWidth)</code> will return the control's internally
     * computed minimum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     */
    private DoubleProperty minHeight;

    /**
     * Property for overriding the control's computed minimum height.
     * This should only be set if the control's internally computed minimum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinHeight(forWidth)</code> will return the control's internally
     * computed minimum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     * @param value the minimum height
     */
    public final void setMinHeight(double value) { minHeightProperty().set(value); }

    /**
     * Property for overriding the control's computed minimum height.
     * This should only be set if the control's internally computed minimum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMinHeight(forWidth)</code> will return the control's internally
     * computed minimum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMinHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     * @return the minimum height
     */
    public final double getMinHeight() { return minHeight == null ? USE_COMPUTED_SIZE : minHeight.get(); }
    public final DoubleProperty minHeightProperty() {
        if (minHeight == null) {
            minHeight = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "minHeight";
                }
            };
        }
        return minHeight;
    }

    /**
     * Convenience method for overriding the control's computed minimum width and height.
     * This should only be called if the control's internally computed minimum size
     * doesn't meet the application's layout needs.
     *
     * @see #setMinWidth
     * @see #setMinHeight
     * @param minWidth  the override value for minimum width
     * @param minHeight the override value for minimum height
     */
    public void setMinSize(double minWidth, double minHeight) {
        setMinWidth(minWidth);
        setMinHeight(minHeight);
    }

    /**
     * Property for overriding the control's computed preferred width.
     * This should only be set if the control's internally computed preferred width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefWidth(forHeight)</code> will return the control's internally
     * computed preferred width.
     */
    private DoubleProperty prefWidth;

    /**
     * Property for overriding the control's computed preferred width.
     * This should only be set if the control's internally computed preferred width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefWidth(forHeight)</code> will return the control's internally
     * computed preferred width.
     * @param value the preferred width
     */
    public final void setPrefWidth(double value) { prefWidthProperty().set(value); }

    /**
     * Property for overriding the control's computed preferred width.
     * This should only be set if the control's internally computed preferred width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefWidth(forHeight)</code> will return the control's internally
     * computed preferred width.
     * @return the preferred width
     */
    public final double getPrefWidth() { return prefWidth == null ? USE_COMPUTED_SIZE : prefWidth.get(); }
    public final DoubleProperty prefWidthProperty() {
        if (prefWidth == null) {
            prefWidth = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "prefWidth";
                }
            };
        }
        return prefWidth;
    }

    /**
     * Property for overriding the control's computed preferred height.
     * This should only be set if the control's internally computed preferred height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefHeight(forWidth)</code> will return the control's internally
     * computed preferred width.
     *
     */
    private DoubleProperty prefHeight;

    /**
     * Property for overriding the control's computed preferred height.
     * This should only be set if the control's internally computed preferred height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefHeight(forWidth)</code> will return the control's internally
     * computed preferred width.
     *
     * @param value the preferred height
     */
    public final void setPrefHeight(double value) { prefHeightProperty().set(value); }

    /**
     * Property for overriding the control's computed preferred height.
     * This should only be set if the control's internally computed preferred height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getPrefHeight(forWidth)</code> will return the control's internally
     * computed preferred width.
     *
     * @return the preferred height
     */
    public final double getPrefHeight() { return prefHeight == null ? USE_COMPUTED_SIZE : prefHeight.get(); }
    public final DoubleProperty prefHeightProperty() {
        if (prefHeight == null) {
            prefHeight = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "prefHeight";
                }
            };
        }
        return prefHeight;
    }

    /**
     * Convenience method for overriding the control's computed preferred width and height.
     * This should only be called if the control's internally computed preferred size
     * doesn't meet the application's layout needs.
     *
     * @see #setPrefWidth
     * @see #setPrefHeight
     * @param prefWidth the override value for preferred width
     * @param prefHeight the override value for preferred height
     */
    public void setPrefSize(double prefWidth, double prefHeight) {
        setPrefWidth(prefWidth);
        setPrefHeight(prefHeight);
    }

    /**
     * Property for overriding the control's computed maximum width.
     * This should only be set if the control's internally computed maximum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxWidth(forHeight)</code> will return the control's internally
     * computed maximum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     */
    private DoubleProperty maxWidth;

    /**
     * Property for overriding the control's computed maximum width.
     * This should only be set if the control's internally computed maximum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxWidth(forHeight)</code> will return the control's internally
     * computed maximum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     * @param value the maximum width
     */
    public final void setMaxWidth(double value) { maxWidthProperty().set(value); }

    /**
     * Property for overriding the control's computed maximum width.
     * This should only be set if the control's internally computed maximum width
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxWidth(forHeight)</code> will return the control's internally
     * computed maximum width.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxWidth(forHeight)</code> to return the control's preferred width,
     * enabling applications to easily restrict the resizability of the control.
     * @return the maximum width
     */
    public final double getMaxWidth() { return maxWidth == null ? USE_COMPUTED_SIZE : maxWidth.get(); }
    public final DoubleProperty maxWidthProperty() {
        if (maxWidth == null) {
            maxWidth = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "maxWidth";
                }
            };
        }
        return maxWidth;
    }

    /**
     * Property for overriding the control's computed maximum height.
     * This should only be set if the control's internally computed maximum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxHeight(forWidth)</code> will return the control's internally
     * computed maximum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     */
    private DoubleProperty maxHeight;

    /**
     * Property for overriding the control's computed maximum height.
     * This should only be set if the control's internally computed maximum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxHeight(forWidth)</code> will return the control's internally
     * computed maximum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     * @param value the maximum height
     */
    public final void setMaxHeight(double value) { maxHeightProperty().set(value); }

    /**
     * Property for overriding the control's computed maximum height.
     * This should only be set if the control's internally computed maximum height
     * doesn't meet the application's layout needs.
     * <p>
     * Defaults to the <code>USE_COMPUTED_SIZE</code> flag, which means that
     * <code>getMaxHeight(forWidth)</code> will return the control's internally
     * computed maximum height.
     * <p>
     * Setting this value to the <code>USE_PREF_SIZE</code> flag will cause
     * <code>getMaxHeight(forWidth)</code> to return the control's preferred height,
     * enabling applications to easily restrict the resizability of the control.
     *
     * @return the maximum height
     */
    public final double getMaxHeight() { return maxHeight == null ? USE_COMPUTED_SIZE : maxHeight.get(); }
    public final DoubleProperty maxHeightProperty() {
        if (maxHeight == null) {
            maxHeight = new DoublePropertyBase(USE_COMPUTED_SIZE) {
                @Override public void invalidated() {
                    if (isShowing()) bridge.requestLayout();
                }

                @Override
                public Object getBean() {
                    return PopupControl.this;
                }

                @Override
                public String getName() {
                    return "maxHeight";
                }
            };
        }
        return maxHeight;
    }

    /**
     * Convenience method for overriding the control's computed maximum width and height.
     * This should only be called if the control's internally computed maximum size
     * doesn't meet the application's layout needs.
     *
     * @see #setMaxWidth
     * @see #setMaxHeight
     * @param maxWidth  the override value for maximum width
     * @param maxHeight the override value for maximum height
     */
    public void setMaxSize(double maxWidth, double maxHeight) {
        setMaxWidth(maxWidth);
        setMaxHeight(maxHeight);
    }

    /**
     * Cached prefWidth, prefHeight, minWidth, minHeight. These
     * results are repeatedly sought during the layout pass,
     * and caching the results leads to a significant decrease
     * in overhead.
     */
    private double prefWidthCache = -1;
    private double prefHeightCache = -1;
    private double minWidthCache = -1;
    private double minHeightCache = -1;
    private double maxWidthCache = -1;
    private double maxHeightCache = -1;
    private boolean skinSizeComputed = false;

    /**
     * Called during layout to determine the minimum width for this node.
     * Returns the value from <code>minWidth(forHeight)</code> unless
     * the application overrode the minimum width by setting the minWidth property.
     *
     * @param height the height
     * @see #setMinWidth
     * @return the minimum width that this node should be resized to during layout
     */
    public final double minWidth(double height) {
        double override = getMinWidth();
        if (override == USE_COMPUTED_SIZE) {
            if (minWidthCache == -1) minWidthCache = recalculateMinWidth(height);
            return minWidthCache;
        } else if (override == USE_PREF_SIZE) {
            return prefWidth(height);
        }
        return override;
    }

    /**
     * Called during layout to determine the minimum height for this node.
     * Returns the value from <code>minHeight(forWidth)</code> unless
     * the application overrode the minimum height by setting the minHeight property.
     *
     * @param width The width
     * @see #setMinHeight
     * @return the minimum height that this node should be resized to during layout
     */
    public final double minHeight(double width) {
        double override = getMinHeight();
        if (override == USE_COMPUTED_SIZE) {
            if (minHeightCache == -1) minHeightCache = recalculateMinHeight(width);
            return minHeightCache;
        } else if (override == USE_PREF_SIZE) {
            return prefHeight(width);
        }
        return override;
    }


    /**
     * Called during layout to determine the preferred width for this node.
     * Returns the value from <code>prefWidth(forHeight)</code> unless
     * the application overrode the preferred width by setting the prefWidth property.
     *
     * @param height the height
     * @see #setPrefWidth
     * @return the preferred width that this node should be resized to during layout
     */
    public final double prefWidth(double height) {
        double override = getPrefWidth();
        if (override == USE_COMPUTED_SIZE) {
            if (prefWidthCache == -1) prefWidthCache = recalculatePrefWidth(height);
            return prefWidthCache;
        } else if (override == USE_PREF_SIZE) {
            return prefWidth(height);
        }
        return override;
    }

    /**
     * Called during layout to determine the preferred height for this node.
     * Returns the value from <code>prefHeight(forWidth)</code> unless
     * the application overrode the preferred height by setting the prefHeight property.
     *
     * @param width the width
     * @see #setPrefHeight
     * @return the preferred height that this node should be resized to during layout
     */
    public final double prefHeight(double width) {
        double override = getPrefHeight();
        if (override == USE_COMPUTED_SIZE) {
            if (prefHeightCache == -1) prefHeightCache = recalculatePrefHeight(width);
            return prefHeightCache;
        } else if (override == USE_PREF_SIZE) {
            return prefHeight(width);
        }
        return override;
    }

    /**
     * Called during layout to determine the maximum width for this node.
     * Returns the value from <code>maxWidth(forHeight)</code> unless
     * the application overrode the maximum width by setting the maxWidth property.
     *
     * @param height the height
     * @see #setMaxWidth
     * @return the maximum width that this node should be resized to during layout
     */
    public final double maxWidth(double height) {
        double override = getMaxWidth();
        if (override == USE_COMPUTED_SIZE) {
            if (maxWidthCache == -1) maxWidthCache = recalculateMaxWidth(height);
            return maxWidthCache;
        } else if (override == USE_PREF_SIZE) {
            return prefWidth(height);
        }
        return override;
    }

    /**
     * Called during layout to determine the maximum height for this node.
     * Returns the value from <code>maxHeight(forWidth)</code> unless
     * the application overrode the maximum height by setting the maxHeight property.
     *
     * @param width the width
     * @see #setMaxHeight
     * @return the maximum height that this node should be resized to during layout
     */
    public final double maxHeight(double width) {
        double override = getMaxHeight();
        if (override == USE_COMPUTED_SIZE) {
            if (maxHeightCache == -1) maxHeightCache = recalculateMaxHeight(width);
            return maxHeightCache;
        } else if (override == USE_PREF_SIZE) {
            return prefHeight(width);
        }
        return override;
    }

    // Implementation of the Resizable interface.
    // Because only the skin can know the min, pref, and max sizes, these
    // functions are implemented to delegate to skin. If there is no skin then
    // we simply return 0 for all the values since a Control without a Skin
    // doesn't render
    private double recalculateMinWidth(double height) {
        recomputeSkinSize();
        return getSkinNode() == null ? 0 : getSkinNode().minWidth(height);
    }
    private double recalculateMinHeight(double width) {
        recomputeSkinSize();
        return getSkinNode() == null ? 0 : getSkinNode().minHeight(width);
    }
    private double recalculateMaxWidth(double height) {
        recomputeSkinSize();
        return getSkinNode() == null ? 0 : getSkinNode().maxWidth(height);
    }
    private double recalculateMaxHeight(double width) {
        recomputeSkinSize();
        return getSkinNode() == null ? 0 : getSkinNode().maxHeight(width);
    }
    private double recalculatePrefWidth(double height) {
        recomputeSkinSize();
        return getSkinNode() == null? 0 : getSkinNode().prefWidth(height);
    }
    private double recalculatePrefHeight(double width) {
        recomputeSkinSize();
        return getSkinNode() == null? 0 : getSkinNode().prefHeight(width);
    }

    private void recomputeSkinSize() {
        if (!skinSizeComputed) {
            // RT-14094, RT-16754: We need the skins of the popup
            // and it children before the stage is visible so we
            // can calculate the popup position based on content
            // size.
            bridge.applyCss();
            skinSizeComputed = true;
        }
    }
//    public double getBaselineOffset() { return getSkinNode() == null? 0 : getSkinNode().getBaselineOffset(); }

    /**
     * Create a new instance of the default skin for this control. This is called to create a skin for the control if
     * no skin is provided via CSS {@code -fx-skin} or set explicitly in a sub-class with {@code  setSkin(...)}.
     *
     * @return  new instance of default skin for this control. If null then the control will have no skin unless one
     *          is provided by css.
     * @since JavaFX 8.0
     */
    protected Skin<?> createDefaultSkin() {
        return null;
    }

    /***************************************************************************
     *                                                                         *
     *                         StyleSheet Handling                             *
     *                                                                         *
     **************************************************************************/

    private static final CssMetaData<CSSBridge,String> SKIN =
            new CssMetaData<CSSBridge,String>("-fx-skin",
                    StringConverter.getInstance()) {

                @Override
                public boolean isSettable(CSSBridge cssBridge) {
                    return !cssBridge.popupControl.skinProperty().isBound();
                }

                @Override
                public StyleableProperty<String> getStyleableProperty(CSSBridge cssBridge) {
                    return (StyleableProperty<String>)(WritableValue<String>)cssBridge.popupControl.skinClassNameProperty();
                }
            };

    private static final List<CssMetaData<? extends Styleable, ?>> STYLEABLES;
    static {
        final List<CssMetaData<? extends Styleable, ?>> styleables =
                new ArrayList<CssMetaData<? extends Styleable, ?>>();
        Collections.addAll(styleables,
                SKIN
        );
        STYLEABLES = Collections.unmodifiableList(styleables);
    }

    /**
     * @return The CssMetaData associated with this class, which may include the
     * CssMetaData of its superclasses.
     * @since JavaFX 8.0
     */
    public static List<CssMetaData<? extends Styleable, ?>> getClassCssMetaData() {
        return STYLEABLES;
    }

    /**
     * {@inheritDoc}
     * @since JavaFX 8.0
     */
    @Override
    public List<CssMetaData<? extends Styleable, ?>> getCssMetaData() {
        return getClassCssMetaData();
    }

    /**
     * @param pseudoClass the pseudo class
     * @param active the active state
     * @see Node#pseudoClassStateChanged(javafx.css.PseudoClass, boolean)
     * @since JavaFX 8.0
     */
    public final void pseudoClassStateChanged(PseudoClass pseudoClass, boolean active) {
        bridge.pseudoClassStateChanged(pseudoClass, active);
    }

    /**
     * {@inheritDoc}
     * @return "PopupControl"
     * @since JavaFX 8.0
     */
    @Override
    public String getTypeSelector() {
        return "PopupControl";
    }

    /**
     * {@inheritDoc}
     *
     * {@literal A PopupControl's styles are based on the popup "owner" which is the}
     * {@link javafx.stage.PopupWindow#getOwnerNode() ownerNode} or,
     * if the ownerNode is not set, the root of the
     * {@link javafx.stage.PopupWindow#getOwnerWindow() ownerWindow's}
     * scene. If the popup has not been shown, both ownerNode and ownerWindow will be null and {@code null} will be returned.
     *
     * {@literal Note that the PopupWindow's scene root is not returned because
     * there is no way to guarantee that the PopupWindow's scene root would
     * properly return the ownerNode or ownerWindow.}
     *
     * @return {@link javafx.stage.PopupWindow#getOwnerNode()}, {@link javafx.stage.PopupWindow#getOwnerWindow()},
     * or null.
     * @since JavaFX 8.0
     */
    @Override
    public Styleable getStyleableParent() {

        final Node ownerNode = getOwnerNode();
        if (ownerNode != null) {
            return ownerNode;

        } else {

            final Window ownerWindow = getOwnerWindow();
            if (ownerWindow != null) {

                final Scene ownerScene = ownerWindow.getScene();
                if (ownerScene != null) {
                    return ownerScene.getRoot();
                }
            }
        }

        return bridge.getParent();

    }

    /**
     * {@inheritDoc}
     * @since JavaFX 8.0
     */
    @Override
    public final ObservableSet<PseudoClass> getPseudoClassStates() {
        return FXCollections.emptyObservableSet();
    }

    /** {@inheritDoc} */
    @Override public Node getStyleableNode() {
        return bridge;
    }

    /**
     * The link between the popup window and the scenegraph.
     *
     * @since JavaFX 2.1
     */
    protected class CSSBridge extends Pane {

        private final PopupControl popupControl = PopupControl.this;

        {
            // To initialize the class helper at the begining each constructor of this class
            CSSBridgeHelper.initHelper(this);
        }

        /**
         * Requests a layout pass to be performed before the next scene is
         * rendered. This is batched up asynchronously to happen once per
         * "pulse", or frame of animation.
         * <p>
         * If this parent is either a layout root or unmanaged, then it will be
         * added directly to the scene's dirty layout list, otherwise requestLayout
         * will be invoked on its parent.
         */
        @Override public void requestLayout() {
            prefWidthCache = -1;
            prefHeightCache = -1;
            minWidthCache = -1;
            minHeightCache = -1;
            maxWidthCache = -1;
            maxHeightCache = -1;
            //skinSizeComputed = false; -- RT-33073 disabled this
            super.requestLayout();
        }

        /**
         * This method should be treated as final and should not be overridden by any subclasses of CSSBridge.
         * @return the styleable parent
         */
        @Override
        public Styleable getStyleableParent() {
            return PopupControl.this.getStyleableParent();
        }

        @Override
        public List<CssMetaData<? extends Styleable, ?>> getCssMetaData() {
            return PopupControl.this.getCssMetaData();
        }

        /*
         * Note: This method MUST only be called via its accessor method.
         */
        private List<String> doGetAllParentStylesheets() {
            Styleable styleable = getStyleableParent();
            if (styleable instanceof Parent) {
                return ParentHelper.getAllParentStylesheets((Parent)styleable);
            }
            return null;
        }

        /*
         * Note: This method MUST only be called via its accessor method.
         */
        private void doProcessCSS() {
            CSSBridgeHelper.superProcessCSS(this);

            if (getSkin() == null) {
                // try to create default skin
                final Skin<?> defaultSkin = createDefaultSkin();
                if (defaultSkin != null) {
                    skinProperty().set(defaultSkin);
                    CSSBridgeHelper.superProcessCSS(this);
                } else {
                    final String msg = "The -fx-skin property has not been defined in CSS for " + this +
                            " and createDefaultSkin() returned null.";
                    final List<CssParser.ParseError> errors = StyleManager.getErrors();
                    if (errors != null) {
                        CssParser.ParseError error = new CssParser.ParseError(msg);
                        errors.add(error); // RT-19884
                    }
                    Logging.getControlsLogger().severe(msg);
                }
            }
        }

    }

    /*
     * Used to access internal methods of CSSBridge.
     */
    static final class CSSBridgeHelper extends PaneHelper {
        private static final CSSBridgeHelper theInstance;

        static {
            theInstance = new CSSBridgeHelper();
        }

        private static CSSBridgeHelper getInstance() {
            return theInstance;
        }

        public static void initHelper(CSSBridge cssBridge) {
            setHelper(cssBridge, getInstance());
        }

        public static void superProcessCSS(Node node) {
            ((CSSBridgeHelper) getHelper(node)).superProcessCSSImpl(node);
        }

        void superProcessCSSImpl(Node node) {
            super.processCSSImpl(node);
        }

        @Override
        protected void processCSSImpl(Node node) {
            ((CSSBridge) node).doProcessCSS();
        }

        @Override
        protected List<String> getAllParentStylesheetsImpl(Parent parent) {
            return ((CSSBridge) parent).doGetAllParentStylesheets();
        }
    }

}