#19 expose home/end for TField

[nikiroo-utils.git] / src / jexer / bits / Cell.java

/*
 * Jexer - Java Text User Interface
 *
 * The MIT License (MIT)
 *
 * Copyright (C) 2017 Kevin Lamonte
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * @author Kevin Lamonte [kevin.lamonte@gmail.com]
 * @version 1
 */
package jexer.bits;

/**
 * This class represents a single text cell on the screen.
 */
public final class Cell extends CellAttributes {

    /**
     * The character at this cell.
     */
    private char ch;

    /**
     * Getter for cell character.
     *
     * @return cell character
     */
    public char getChar() {
        return ch;
    }

    /**
     * Setter for cell character.
     *
     * @param ch new cell character
     */
    public void setChar(final char ch) {
        this.ch = ch;
    }

    /**
     * Reset this cell to a blank.
     */
    @Override
    public void reset() {
        super.reset();
        ch = ' ';
    }

    /**
     * Check to see if this cell has default attributes: white foreground,
     * black background, no bold/blink/reverse/underline/protect, and a
     * character value of ' ' (space).
     *
     * @return true if this cell has default attributes.
     */
    public boolean isBlank() {
        if ((getForeColor().equals(Color.WHITE))
            && (getBackColor().equals(Color.BLACK))
            && !isBold()
            && !isBlink()
            && !isReverse()
            && !isUnderline()
            && !isProtect()
            && (ch == ' ')
        ) {
            return true;
        }

        return false;
    }

    /**
     * Comparison check.  All fields must match to return true.
     *
     * @param rhs another Cell instance
     * @return true if all fields are equal
     */
    @Override
    public boolean equals(final Object rhs) {
        if (!(rhs instanceof Cell)) {
            return false;
        }

        Cell that = (Cell) rhs;

        if (ch == that.ch) {
            return super.equals(rhs);
        }
        return false;
    }

    /**
     * Hashcode uses all fields in equals().
     *
     * @return the hash
     */
    @Override
    public int hashCode() {
        int A = 13;
        int B = 23;
        int hash = A;
        hash = (B * hash) + super.hashCode();
        hash = (B * hash) + (int)ch;
        return hash;
    }

    /**
     * Set my field values to that's field.
     *
     * @param rhs an instance of either Cell or CellAttributes
     */
    @Override
    public void setTo(final Object rhs) {
        // Let this throw a ClassCastException
        CellAttributes thatAttr = (CellAttributes) rhs;
        super.setTo(thatAttr);

        if (rhs instanceof Cell) {
            Cell that = (Cell) rhs;
            this.ch = that.ch;
        }
    }

    /**
     * Set my field attr values to that's field.
     *
     * @param that a CellAttributes instance
     */
    public void setAttr(final CellAttributes that) {
        super.setTo(that);
    }

    /**
     * Public constructor sets default values of the cell to blank.
     *
     * @see #isBlank()
     * @see #reset()
     */
    public Cell() {
        reset();
    }

    /**
     * Public constructor sets the character.  Attributes are the same as
     * default.
     *
     * @param ch character to set to
     * @see #reset()
     */
    public Cell(final char ch) {
        reset();
        this.ch = ch;
    }

    /**
     * Make human-readable description of this Cell.
     *
     * @return displayable String
     */
    @Override
    public String toString() {
        return String.format("fore: %s back: %s bold: %s blink: %s ch %c",
            getForeColor(), getBackColor(), isBold(), isBlink(), ch);
    }
}