package com.onaro.util.jfc.mixedvalue;

import static com.onaro.util.jfc.mixedvalue.MixedValueConstants.*;

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

/**
 * An extension to {@link JTextField} allowing for a special "mixed" valued. Used when editing multiple values which are
 * not the same, though the user can set all of them to the same new value typed in to the field.
 * <p>
 * Once the user clics or types in the field, the mixed mode, if set, is cleared and the value clears.
 */
public class MixedValueTextField extends JTextField implements MouseListener, KeyListener {
    private static final long serialVersionUID = 1L;

    /**
     * Tells if the current value is this special "mixed".
     */
    private boolean mixed;

    /**
     * Keeps the standard forground color while showing the special "mixed" color.
     */
    private Color regularColor;

    /**
     * Font to use for the special "mixed" value.
     */
    private Font italicFont;

    /**
     * Standard font to use for any value but the special "mixed" value.
     */
    private Font plainFont;

    /**
     * Initializes this mixed-value text field. Records the default colors and fonts. Registers the listeners that will
     * clear the "mixed mode" once the user clicks or types in the field.
     */
    public MixedValueTextField() {
        this.regularColor = this.getForeground();
        italicFont = getFont().deriveFont(Font.ITALIC);
        plainFont = getFont().deriveFont(Font.PLAIN);

        addMouseListener(this);
        addKeyListener(this);
    }

    /**
     * Sets the mixed mode of this field. When set to true, the field will show "mixed" in italic, blue font.
     * @param mixed true if the field should enter the "mixed mode"
     */
    public void setMixed(boolean mixed) {
        if (this.mixed == mixed) return;
        this.mixed = mixed;

        if (mixed) {
            super.setText(MIXED_VALUE);
            setForeground(UIManager.getColor("mixedValue.color")); //$NON-NLS-1$
            setFont(italicFont);
        } else {
            setText(null);
            setForeground(regularColor);
            setFont(plainFont);
        }
    }

    /**
     * Tells if the field is currently in "mixed mode".
     * @return true if the field is in "mixed mode"
     */
    public boolean isMixed() {
        return mixed;
    }

    /**
     * Clears the "mixed mode" upon mouse-click.
     */
    public void mouseClicked(MouseEvent e) {
        setMixed(false);
    }

    public void mousePressed(MouseEvent e) {}

    public void mouseReleased(MouseEvent e) {}

    public void mouseEntered(MouseEvent e) {}

    public void mouseExited(MouseEvent e) {}

    public void keyTyped(KeyEvent e) {}

    /**
     * Clears the "mixed mode" upon key-press in the field (needed when the field is in focus due to usage of tabs.
     */
    public void keyPressed(KeyEvent e) {
        setMixed(false);
    }

    public void keyReleased(KeyEvent e) {}
}