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 * 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.

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 * 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

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package javax.swing.plaf.nimbus;

import javax.swing.UIManager;

import java.awt.Color;

import java.beans.PropertyChangeSupport;

import java.beans.PropertyChangeListener;

/**

 * DerivedColor - A color implementation that is derived from a UIManager

 * defaults table color and a set of offsets. It can be rederived at any point

 * by calling rederiveColor(). For example when its parent color changes and it

 * value will update to reflect the new derived color. Property change events

 * are fired for the "rgb" property when the derived color changes.

 *

 * @author Jasper Potts

 */

class DerivedColor extends Color {

    private final String uiDefaultParentName;

    private final float hOffset, sOffset, bOffset;

    private final int aOffset;

    private int argbValue;

    DerivedColor(String uiDefaultParentName, float hOffset, float sOffset, float bOffset, int aOffset) {

        super(0);

        this.uiDefaultParentName = uiDefaultParentName;

        this.hOffset = hOffset;

        this.sOffset = sOffset;

        this.bOffset = bOffset;

        this.aOffset = aOffset;

    }

    public String getUiDefaultParentName() {

        return uiDefaultParentName;

    }

    public float getHueOffset() {

        return hOffset;

    }

    public float getSaturationOffset() {

        return sOffset;

    }

    public float getBrightnessOffset() {

        return bOffset;

    }

    public int getAlphaOffset() {

        return aOffset;

    }

    /**

     * Recalculate the derived color from the UIManager parent color and offsets

     */

    public void rederiveColor() {

        Color src = UIManager.getColor(uiDefaultParentName);

        if (src != null) {

            float[] tmp = Color.RGBtoHSB(src.getRed(), src.getGreen(), src.getBlue(), null);

            // apply offsets

            tmp[0] = clamp(tmp[0] + hOffset);

            tmp[1] = clamp(tmp[1] + sOffset);

            tmp[2] = clamp(tmp[2] + bOffset);

            int alpha = clamp(src.getAlpha() + aOffset);

            argbValue = (Color.HSBtoRGB(tmp[0], tmp[1], tmp[2]) & 0xFFFFFF) | (alpha << 24);

        } else {

            float[] tmp = new float[3];

            tmp[0] = clamp(hOffset);

            tmp[1] = clamp(sOffset);

            tmp[2] = clamp(bOffset);

            int alpha = clamp(aOffset);

            argbValue = (Color.HSBtoRGB(tmp[0], tmp[1], tmp[2]) & 0xFFFFFF) | (alpha << 24);

        }

    }

    /**

     * Returns the RGB value representing the color in the default sRGB {@link java.awt.image.ColorModel}. (Bits 24-31

     * are alpha, 16-23 are red, 8-15 are green, 0-7 are blue).

     *

     * @return the RGB value of the color in the default sRGB <code>ColorModel</code>.

     * @see java.awt.image.ColorModel#getRGBdefault

     * @see #getRed

     * @see #getGreen

     * @see #getBlue

     * @since JDK1.0

     */

    @Override public int getRGB() {

        return argbValue;

    }

    @Override

    public boolean equals(Object o) {

        if (this == o) return true;

        if (!(o instanceof DerivedColor)) return false;

        DerivedColor that = (DerivedColor) o;

        if (aOffset != that.aOffset) return false;

        if (Float.compare(that.bOffset, bOffset) != 0) return false;

        if (Float.compare(that.hOffset, hOffset) != 0) return false;

        if (Float.compare(that.sOffset, sOffset) != 0) return false;

        if (!uiDefaultParentName.equals(that.uiDefaultParentName)) return false;

        return true;

    }

    @Override

    public int hashCode() {

        int result = uiDefaultParentName.hashCode();

        result = 31 * result + hOffset != +0.0f ?

                Float.floatToIntBits(hOffset) : 0;

        result = 31 * result + sOffset != +0.0f ?

                Float.floatToIntBits(sOffset) : 0;

        result = 31 * result + bOffset != +0.0f ?

                Float.floatToIntBits(bOffset) : 0;

        result = 31 * result + aOffset;

        return result;

    }

    private float clamp(float value) {

        if (value < 0) {

            value = 0;

        } else if (value > 1) {

            value = 1;

        }

        return value;

    }

    private int clamp(int value) {

        if (value < 0) {

            value = 0;

        } else if (value > 255) {

            value = 255;

        }

        return value;

    }

    /**

     * Returns a string representation of this <code>Color</code>. This method

     * is intended to be used only for debugging purposes. The content and

     * format of the returned string might vary between implementations. The

     * returned string might be empty but cannot be <code>null</code>.

     *

     * @return a String representation of this <code>Color</code>.

     */

    @Override

    public String toString() {

        Color src = UIManager.getColor(uiDefaultParentName);

        String s = "DerivedColor(color=" + getRed() + "," + getGreen() + "," + getBlue() +

                " parent=" + uiDefaultParentName +

                " offsets=" + getHueOffset() + "," + getSaturationOffset() + ","

                + getBrightnessOffset() + "," + getAlphaOffset();

        return src == null ? s : s + " pColor=" + src.getRed() + "," + src.getGreen() + "," + src.getBlue();

    }

    static class UIResource extends DerivedColor implements javax.swing.plaf.UIResource {

        UIResource(String uiDefaultParentName, float hOffset, float sOffset,

                   float bOffset, int aOffset) {

            super(uiDefaultParentName, hOffset, sOffset, bOffset, aOffset);

        }

        @Override

        public boolean equals(Object o) {

            return (o instanceof UIResource) && super.equals(o);

        }

        @Override

        public int hashCode() {

            return super.hashCode() + 7;

        }

    }

}