TreeCellEditorPainter.java example

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JDK-master
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package javax.swing.plaf.nimbus;

import java.awt.*;
import java.awt.geom.*;
import java.awt.image.*;
import javax.swing.*;
import javax.swing.Painter;


final class TreeCellEditorPainter extends AbstractRegionPainter {
    //package private integers representing the available states that
    //this painter will paint. These are used when creating a new instance
    //of TreeCellEditorPainter to determine which region/state is being painted
    //by that instance.
    static final int BACKGROUND_DISABLED = 1;
    static final int BACKGROUND_ENABLED = 2;
    static final int BACKGROUND_ENABLED_FOCUSED = 3;
    static final int BACKGROUND_SELECTED = 4;


    private int state; //refers to one of the static final ints above
    private PaintContext ctx;

    //the following 4 variables are reused during the painting code of the layers
    private Path2D path = new Path2D.Float();
    private Rectangle2D rect = new Rectangle2D.Float(0, 0, 0, 0);
    private RoundRectangle2D roundRect = new RoundRectangle2D.Float(0, 0, 0, 0, 0, 0);
    private Ellipse2D ellipse = new Ellipse2D.Float(0, 0, 0, 0);

    //All Colors used for painting are stored here. Ideally, only those colors being used
    //by a particular instance of TreeCellEditorPainter would be created. For the moment at least,
    //however, all are created for each instance.
    private Color color1 = decodeColor("nimbusBlueGrey", 0.0f, -0.017358616f, -0.11372548f, 0);
    private Color color2 = decodeColor("nimbusFocus", 0.0f, 0.0f, 0.0f, 0);


    //Array of current component colors, updated in each paint call
    private Object[] componentColors;

    public TreeCellEditorPainter(PaintContext ctx, int state) {
        super();
        this.state = state;
        this.ctx = ctx;
    }

    @Override
    protected void doPaint(Graphics2D g, JComponent c, int width, int height, Object[] extendedCacheKeys) {
        //populate componentColors array with colors calculated in getExtendedCacheKeys call
        componentColors = extendedCacheKeys;
        //generate this entire method. Each state/bg/fg/border combo that has
        //been painted gets its own KEY and paint method.
        switch(state) {
            case BACKGROUND_ENABLED: paintBackgroundEnabled(g); break;
            case BACKGROUND_ENABLED_FOCUSED: paintBackgroundEnabledAndFocused(g); break;

        }
    }
        


    @Override
    protected final PaintContext getPaintContext() {
        return ctx;
    }

    private void paintBackgroundEnabled(Graphics2D g) {
        path = decodePath1();
        g.setPaint(color1);
        g.fill(path);

    }

    private void paintBackgroundEnabledAndFocused(Graphics2D g) {
        path = decodePath2();
        g.setPaint(color2);
        g.fill(path);

    }



    private Path2D decodePath1() {
        path.reset();
        path.moveTo(decodeX(0.0f), decodeY(0.0f));
        path.lineTo(decodeX(0.0f), decodeY(3.0f));
        path.lineTo(decodeX(3.0f), decodeY(3.0f));
        path.lineTo(decodeX(3.0f), decodeY(0.0f));
        path.lineTo(decodeX(0.2f), decodeY(0.0f));
        path.lineTo(decodeX(0.2f), decodeY(0.2f));
        path.lineTo(decodeX(2.8f), decodeY(0.2f));
        path.lineTo(decodeX(2.8f), decodeY(2.8f));
        path.lineTo(decodeX(0.2f), decodeY(2.8f));
        path.lineTo(decodeX(0.2f), decodeY(0.0f));
        path.lineTo(decodeX(0.0f), decodeY(0.0f));
        path.closePath();
        return path;
    }

    private Path2D decodePath2() {
        path.reset();
        path.moveTo(decodeX(0.0f), decodeY(0.0f));
        path.lineTo(decodeX(0.0f), decodeY(3.0f));
        path.lineTo(decodeX(3.0f), decodeY(3.0f));
        path.lineTo(decodeX(3.0f), decodeY(0.0f));
        path.lineTo(decodeX(0.24000001f), decodeY(0.0f));
        path.lineTo(decodeX(0.24000001f), decodeY(0.24000001f));
        path.lineTo(decodeX(2.7600007f), decodeY(0.24000001f));
        path.lineTo(decodeX(2.7600007f), decodeY(2.7599998f));
        path.lineTo(decodeX(0.24000001f), decodeY(2.7599998f));
        path.lineTo(decodeX(0.24000001f), decodeY(0.0f));
        path.lineTo(decodeX(0.0f), decodeY(0.0f));
        path.closePath();
        return path;
    }




}