package org.tigris.swidgets;

import java.awt.*;
import java.awt.event.*;
import javax.swing.border.Border;

/**
 * Various utilities to aid components that are aware of their
 * horizontal/vertical orientation.  The Singleton pattern is used to
 * ensure that only one instance of a horizontal and one instance of a
 * vertical <code>Orientation</code> exist.<p>
 *
 * Operations performed using length or breadth are transposed to
 * width and height depending on whether this is a vertical or
 * horizontal orientation.<p>
 *
 * Horizontal treats length as width, breadth as height and position
 * as x.<p>
 *
 * Vertical treats length as height, breadth as width and position as
 * y.<p>
 *
 *<pre>
 *    HORIZONTAL                                          VERTICAL
 *
 *                                                    A
 *                                                    |
 *                                                 position = y
 *                                                    |
 *                                                    V
 *                +-------------+   A                 +-------------+   A
 *                |             |   |                 |             |   |
 * <--position--> |             | breadth = height    |             | length =
 *    = x         |             |   |                 |             |   |height
 *                +-------------+   V                 +-------------+   V
 *                 <-- length-->                       <--breadth-->
 *                    = width                             = width
 *</pre>
 *
 * @author Bob Tarling
 */
public class Vertical extends Orientation {

    private static final Vertical VERTICAL = new Vertical();

    protected Vertical() {
    }

    /**
     * Get an instance of an <code>Orientation</code> object.
     *
     * @parameter orientation value representing the type of
     * orientation required, HORIZONTAL or VERTICAL.
     * @return An instance of <code>Orientation</code>.
     */
    public static Orientation getInstance() {
        return VERTICAL;
    }

    /**
     * Get an instance of an <code>Orientation</code> perpendicular to
     * this instance.<p>
     *
     * If called on a horizontal instance then a vertical instance is
     * returned.<p>
     *
     * If called on a vertical instance then a horizontal instance is
     * returned.<p>
     *
     * @return A vertical or horizontal orientation.
     */
    public Orientation getPerpendicular() {
        return Horizontal.getInstance();
    }

    /**
     * Get the length of a <code>Dimension</code>.
     *
     * @parameter dim The <code>Dimension</code> of which to determine
     * the length
     * @return The length of the <code>Dimension</code>.
     */
    public int getLength(Dimension dim) {
        return (int) dim.getHeight();
    }

    /**
     * Get the length of a <code>Component</code>.
     *
     * @parameter comp The <code>Component</code> of which to
     * determine the length
     * @return The length of the <code>Component</code>.
     */
    public int getLength(Component comp) {
        return comp.getHeight();
    }
    
    /**
     * Get the usable length of a <code>Container</code> minus its
     * <code>insets</code>.
     *
     * @parameter cont The <code>Container</code> of which to
     * determine the length
     * @return The length of the <code>Component</code>.
     */
    public int getLengthMinusInsets(Container cont) {
        Insets insets = cont.getInsets();
        return cont.getHeight() - (insets.top + insets.bottom);
    }

    /**
     * Get the breadth of a <code>Dimension</code>.
     *
     * @parameter dim The <code>Dimension</code> of which to determine
     * the breadth
     * @return The breadth of the <code>Dimension</code>.
     */
    public int getBreadth(Dimension dim) {
        return (int) dim.getWidth();
    }

    /**
     * Get the breadth of a <code>Component</code>.
     *
     * @parameter comp The <code>Component</code> of which to
     * determine the breadth
     * @return The breadth of the <code>Component</code>.
     */
    public int getBreadth(Component comp) {
        return comp.getWidth();
    }

    /**
     * Get the position of a <code>Point</code>.
     *
     * @parameter point The <code>Point</code> of which to determine
     * the position
     * @return The position of the <code>Point</code>.
     */
    public int getPosition(Point point) {
        return (int) point.getY();
    }

    /**
     * Get the offset of a <code>Point</code>.
     *
     * @parameter point The <code>Point</code> of which to determine the offset.
     * @return The position of the <code>Point</code>.
     */
    public int getOffset(Point point) {
        return (int) point.getX();
    }

    /**
     * Determines the last usable position in a
     * <code>Container</code>. This takes into account the
     * <code>Insets</code> of the <code>Container</code>.
     *
     * @parameter cont the <code>Container</code> from which to
     * determine the last usable position.
     * @return The offset of the <code>Container</code>.
     */
    public int getLastUsablePosition(Container cont) {
        return cont.getHeight() - cont.getInsets().bottom;
    }

    /**
     * Determines the first usable offset in a
     * <code>Container</code>. This takes into account the
     * <code>Insets</code> of the <code>Container</code>.
     *
     * @parameter cont the <code>Container</code> from which to
     * determine the first usable position.
     * @return The offset of the <code>Container</code>.
     */
    public int getFirstUsableOffset(Container cont) {
        return cont.getInsets().top;
    }

    
    /**
     * Generate a new <code>Point</code> object from position and offset values.
     *
     * @parameter position the required position of the new <code>Point</code>.
     * @parameter offset the required offset of the new <code>Point</code>.
     * @return The newly created <code>Point</code> object.
     */
    public Point newPoint(int position, int offset) {
        return new Point(offset, position);
    }

    
    /**
     * Get the position of a <code>Component</code>.
     *
     * @parameter comp The <code>Component</code> of which to
     * determine the position
     * @return The position of the <code>Component</code>.
     */
    public int getPosition(Component comp) {
        return comp.getY();
    }

    /**
     * Get the position of a <code>MouseEvent</code>.
     *
     * @parameter me The <code>MouseEvent</code> of which to determine
     * the position
     * @return The position of the <code>MouseEvent</code>.
     */
    public int getPosition(MouseEvent me) {
        return me.getY();
    }

    /**
     * Create a new <code>Dimension</code> from an existing
     * <code>Dimension</code> with its length increased by a given
     * value.
     *
     * @parameter original The <code>Dimension</code> to be added to.
     * @parameter add The amount to add to the <code>Dimension</code>.
     * @return The resulting <code>Dimension</code>.
     */
    public Dimension addLength(Dimension original, int add) {
        double width = original.getWidth();
        double height = original.getHeight() + add;
        return new Dimension((int) width, (int) height);
    }

    /**
     * Create a new <code>Point</code> from an existing
     * <code>Point</code> with its position increased by a given
     * value.
     *
     * @parameter original The <code>Point</code> to be added to.
     * @parameter add The amount to add to the <code>Point</code>.
     * @return The resulting <code>Point</code>.
     */
    public Point addToPosition(Point original, int add) {
        double x = original.getX();
        double y = original.getY() + add;
        return new Point((int) x, (int) y);
    }

    /**
     * Create a new <code>Dimension</code> from an existing
     * <code>Dimension</code> with its length changed to a given
     * value.
     *
     * @parameter original The <code>Dimension</code> to be added to.
     * @parameter length The length to assign to the new
     * <code>Dimension</code>.
     * @return             The resulting <code>Dimension</code>.
     */
    public Dimension setLength(Dimension original, int length) {
        return new Dimension((int) original.getWidth(), length);
    }

    /**
     * Create a new <code>Dimension</code> from an existing
     * <code>Dimension</code> with its length changed to the length of
     * another given <code>Dimension</code>.
     *
     * @parameter original The <code>Dimension</code> to be added to.
     * @parameter length The <code>Dimension</code> whose length is to
     * be assigned to the new <code>Dimension</code>.
     * @return             The resulting <code>Dimension</code>.
     */
    public Dimension setLength(Dimension original, Dimension length) {
        return new Dimension((int) original.getWidth(),
			     (int) length.getHeight());
    }

    /**
     * Create a new <code>Dimension</code> from an existing
     * <code>Dimension</code> with its breadth changed to a given
     * value.
     *
     * @parameter original The <code>Dimension</code> to be added to.
     * @parameter breadth The breadth to assign to the new
     * <code>Dimension</code>.
     * @return             The resulting <code>Dimension</code>.
     */
    public Dimension setBreadth(Dimension original, int breadth) {
        return new Dimension(breadth, (int) original.getHeight());
    }

    /**
     * Create a new <code>Dimension</code> from an existing
     * <code>Dimension</code> with its breadth changed to the breadth
     * of another given <code>Dimension</code>.
     *
     * @parameter original The <code>Dimension</code> to be added to.
     * @parameter breadth The <code>Dimension</code> whose breadth is
     * to be assigned to the new <code>Dimension</code>.
     * @return             The resulting <code>Dimension</code>.
     */
    public Dimension setBreadth(Dimension original, Dimension breadth) {
        return new Dimension((int) breadth.getWidth(),
			     (int) original.getHeight());
    }

    /**
     * Create a new <code>Point</code> from an existing
     * <code>Point</code> with its position changed to a given value.
     *
     * @parameter original The <code>Point</code> whose position is to
     * be modified.
     * @parameter position The value to assign as the new position.
     * @return             The resulting <code>Point</code>.
     */
    public Point setPosition(Point original, int position) {
        return new Point((int) original.getX(), position);
    }
    
    /**
     * Get a cursor object pointing in the same direction as the orientation.
     *
     * @return The resulting <code>Cursor</code>.
     */
    public Cursor getCursor() {
        return new Cursor(Cursor.N_RESIZE_CURSOR);
    }
    
    /**
     * Get an arrow button pointing to the start of the orientation.
     *
     * @return The resulting <code>ArrowButton</code>.
     */
    public ArrowButton getStartArrowButton() {
        return new ArrowButton(ArrowButton.NORTH, (Border) null);
    }
    
    /**
     * Get an arrow button pointing to the end of the orientation.
     *
     * @return The resulting <code>ArrowButton</code>.
     */
    public ArrowButton getEndArrowButton() {
        return new ArrowButton(ArrowButton.SOUTH, (Border) null);
    }
}