synthpainterimpl.java

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/*
 * @(#)SynthPainterImpl.java	1.8 08/05/29
 *
 * Copyright 2007 Sun Microsystems, Inc. All rights reserved.
 * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 */
package com.sun.java.swing.plaf.nimbus;

import java.awt.*;
import java.awt.geom.AffineTransform;
import java.awt.geom.NoninvertibleTransformException;
import java.awt.image.BufferedImage;
import java.util.*;
import javax.swing.*;
import javax.swing.plaf.synth.SynthContext;
import javax.swing.plaf.synth.SynthPainter;
import javax.swing.plaf.synth.SynthConstants;

import com.sun.java.swing.Painter;


/**
 *
 * @author rbair
 */
class SynthPainterImpl extends SynthPainter {
    private NimbusStyle style;

    SynthPainterImpl(NimbusStyle style) {
        this.style = style;
    }

    /**
     * Paint the provided painter using the provided transform at the specified
     * position and size. Handles if g is a non 2D Graphics by painting via a
     * BufferedImage.
     */
    private void paint(Painter p, SynthContext ctx, Graphics g, int x, int y,
                       int w, int h, AffineTransform transform) {
        if (p != null) {
            if (g instanceof Graphics2D){
                Graphics2D gfx = (Graphics2D)g;
                if (transform!=null){
                    gfx.transform(transform);
                }
                gfx.translate(x, y);
                p.paint(gfx, ctx.getComponent(), w, h);
                gfx.translate(-x, -y);
                if (transform!=null){
                    try {
                        gfx.transform(transform.createInverse());
                    } catch (NoninvertibleTransformException e) {
                        // this should never happen as we are in control of all
                        // calls into this method and only ever pass in simple
                        // transforms of rotate, flip and translates
                        e.printStackTrace();
                    }
                }
            } else {
                // use image if we are printing to a Java 1.1 PrintGraphics as
                // it is not a instance of Graphics2D
                BufferedImage img = new BufferedImage(w,h,
                        BufferedImage.TYPE_INT_ARGB);
                Graphics2D gfx = img.createGraphics();
                if (transform!=null){
                    gfx.transform(transform);
                }
                p.paint(gfx, ctx.getComponent(), w, h);
                gfx.dispose();
                g.drawImage(img,x,y,null);
                img = null;
            }
        }
    }

    private void paintBackground(SynthContext ctx, Graphics g, int x, int y,
                                 int w, int h, AffineTransform transform) {
        // if the background color of the component is 100% transparent
        // then we should not paint any background graphics. This is a solution
        // for there being no way of turning off Nimbus background painting as
        // basic components are all non-opaque by default.
        Component c = ctx.getComponent();
        Color bg = (c != null) ? c.getBackground() : null;
        if (bg == null || bg.getAlpha() > 0){
            Painter backgroundPainter = style.getBackgroundPainter(ctx);
            if (backgroundPainter != null) {
                paint(backgroundPainter, ctx, g, x, y, w, h,transform);
            }
        }
    }

    private void paintForeground(SynthContext ctx, Graphics g, int x, int y,
                                 int w, int h, AffineTransform transform) {
        Painter foregroundPainter = style.getForegroundPainter(ctx);
        if (foregroundPainter != null) {
            paint(foregroundPainter, ctx, g, x, y, w, h,transform);
        }
    }

    private void paintBorder(SynthContext ctx, Graphics g, int x, int y, int w,
                             int h, AffineTransform transform) {
        Painter borderPainter = style.getBorderPainter(ctx);
        if (borderPainter != null) {
            paint(borderPainter, ctx, g, x, y, w, h,transform);
        }
    }

    private void paintBackground(SynthContext ctx, Graphics g, int x, int y, int w, int h, int orientation) {
        Component c = ctx.getComponent();
        boolean ltr = c.getComponentOrientation().isLeftToRight();
        // Don't RTL flip JSpliders as they handle it internaly
        if (ctx.getComponent() instanceof JSlider) ltr = true;

        if (orientation == SwingConstants.VERTICAL && ltr) {
            AffineTransform transform = new AffineTransform();
            transform.scale(-1, 1);
            transform.rotate(Math.toRadians(90));
            paintBackground(ctx, g, y, x, h, w, transform);
        } else if (orientation == SwingConstants.VERTICAL) {
            AffineTransform transform = new AffineTransform();
            transform.rotate(Math.toRadians(90));
            transform.translate(0,-(x+w));
            paintBackground(ctx, g, y, x, h, w, transform);
        } else if (orientation == SwingConstants.HORIZONTAL && ltr) {
            paintBackground(ctx, g, x, y, w, h, null);
        } else {
            //horizontal and right-to-left orientation
            AffineTransform transform = new AffineTransform();
            transform.translate(x,y);
            transform.scale(-1, 1);
            transform.translate(-w,0);
            paintBackground(ctx, g, 0, 0, w, h, transform);
        }
    }

    private void paintBorder(SynthContext ctx, Graphics g, int x, int y, int w, int h, int orientation) {
        Component c = ctx.getComponent();
        boolean ltr = c.getComponentOrientation().isLeftToRight();
        if (orientation == SwingConstants.VERTICAL && ltr) {
            AffineTransform transform = new AffineTransform();
            transform.scale(-1, 1);
            transform.rotate(Math.toRadians(90));
            paintBorder(ctx, g, y, x, h, w, transform);
        } else if (orientation == SwingConstants.VERTICAL) {
            AffineTransform transform = new AffineTransform();
            transform.rotate(Math.toRadians(90));
            transform.translate(0, -(x + w));
            paintBorder(ctx, g, y, 0, h, w, transform);
        } else if (orientation == SwingConstants.HORIZONTAL && ltr) {
            paintBorder(ctx, g, x, y, w, h, null);
        } else {
            //horizontal and right-to-left orientation
            paintBorder(ctx, g, x, y, w, h, null);
        }
    }

    private void paintForeground(SynthContext ctx, Graphics g, int x, int y, int w, int h, int orientation) {
        Component c = ctx.getComponent();
        boolean ltr = c.getComponentOrientation().isLeftToRight();
        if (orientation == SwingConstants.VERTICAL && ltr) {
            AffineTransform transform = new AffineTransform();
            transform.scale(-1, 1);
            transform.rotate(Math.toRadians(90));
            paintForeground(ctx, g, y, x, h, w, transform);
        } else if (orientation == SwingConstants.VERTICAL) {
            AffineTransform transform = new AffineTransform();
            transform.rotate(Math.toRadians(90));
            transform.translate(0, -(x + w));
            paintForeground(ctx, g, y, 0, h, w, transform);
        } else if (orientation == SwingConstants.HORIZONTAL && ltr) {
            paintForeground(ctx, g, x, y, w, h, null);
        } else {
            //horizontal and right-to-left orientation
            paintForeground(ctx, g, x, y, w, h, null);
        }
    }

    /**
     * Paints the background of an arrow button. Arrow buttons are created by
     * some components, such as <code>JScrollBar</code>.
     *
     * @param context SynthContext identifying the <code>JComponent</code> and
     *        <code>Region</code> to paint to
     * @param g <code>Graphics</code> to paint to
     * @param x X coordinate of the area to paint to
     * @param y Y coordinate of the area to paint to
     * @param w Width of the area to paint to
     * @param h Height of the area to paint to
     */
    public void paintArrowButtonBackground(SynthContext context,
                                           Graphics g, int x, int y,
                                           int w, int h) {
        if (context.getComponent().getComponentOrientation().isLeftToRight()){
            paintBackground(context, g, x, y, w, h, null);
        } else {
            AffineTransform transform = new AffineTransform();
            transform.translate(x,y);
            transform.scale(-1, 1);
            transform.translate(-w,0);
            paintBackground(context, g, 0, 0, w, h, transform);
        }
    }

    /**
     * Paints the border of an arrow button. Arrow buttons are created by
     * some components, such as <code>JScrollBar</code>.
     *
     * @param context SynthContext identifying the <code>JComponent</code> and
     *        <code>Region</code> to paint to
     * @param g <code>Graphics</code> to paint to
     * @param x X coordinate of the area to paint to
     * @param y Y coordinate of the area to paint to
     * @param w Width of the area to paint to
     * @param h Height of the area to paint to
     */
    public void paintArrowButtonBorder(SynthContext context,
                                       Graphics g, int x, int y,
                                       int w, int h) {
        paintBorder(context, g, x, y, w, h, null);
    }

    /**
     * Paints the foreground of an arrow button. This method is responsible
     * for drawing a graphical representation of a direction, typically
     * an arrow. Arrow buttons are created by
     * some components, such as <code>JScrollBar</code>
     *
     * @param context SynthContext identifying the <code>JComponent</code> and
     *        <code>Region</code> to paint to
     * @param g <code>Graphics</code> to paint to
     * @param x X coordinate of the area to paint to
     * @param y Y coordinate of the area to paint to
     * @param w Width of the area to paint to
     * @param h Height of the area to paint to
     * @param direction One of SwingConstants.NORTH, SwingConstants.SOUTH
     *                  SwingConstants.EAST or SwingConstants.WEST
     */
    public void paintArrowButtonForeground(SynthContext context,
                                           Graphics g, int x, int y,
                                           int w, int h,
                                           int direction) {
        //assume that the painter is arranged with the arrow pointing... LEFT?
        String compName = context.getComponent().getName();
        boolean ltr = context.getComponent().
                getComponentOrientation().isLeftToRight();
        // The hard coding for spinners here needs to be replaced by a more
        // general method for disabling rotation
        if ("Spinner.nextButton".equals(compName) ||
                "Spinner.previousButton".equals(compName)) {
            if (ltr){
                paintForeground(context, g, x, y, w, h, null);
            } else {
                AffineTransform transform = new AffineTransform();
                transform.translate(w, 0);
                transform.scale(-1, 1);
                paintForeground(context, g, x, y, w, h, transform);
            }
        } else if (direction == SwingConstants.WEST) {
            paintForeground(context, g, x, y, w, h, null);
        } else if (direction == SwingConstants.NORTH) {
            if (ltr){
                AffineTransform transform = new AffineTransform();
                transform.scale(-1, 1);
                transform.rotate(Math.toRadians(90));
                paintForeground(context, g, y, 0, h, w, transform);
            } else {
                AffineTransform transform = new AffineTransform();
                transform.rotate(Math.toRadians(90));
                transform.translate(0, -(x + w));
                paintForeground(context, g, y, 0, h, w, transform);
            }
        } else if (direction == SwingConstants.EAST) {
            AffineTransform transform = new AffineTransform();
            transform.translate(w, 0);
            transform.scale(-1, 1);
            paintForeground(context, g, x, y, w, h, transform);
        } else if (direction == SwingConstants.SOUTH) {
            if (ltr){
                AffineTransform transform = new AffineTransform();
                transform.rotate(Math.toRadians(-90));
                transform.translate(-h, 0);
                paintForeground(context, g, y, x, h, w, transform);
            } else {
                AffineTransform transform = new AffineTransform();
                transform.scale(-1, 1);
                transform.rotate(Math.toRadians(-90));
                transform.translate(-(h+y), -(w+x));
                paintForeground(context, g, y, x, h, w, transform);
            }
        }
    }

    /**
     * Paints the background of a button.
     *
     * @param context SynthContext identifying the <code>JComponent</code> and
     *        <code>Region</code> to paint to
     * @param g <code>Graphics</code> to paint to
     * @param x X coordinate of the area to paint to
     * @param y Y coordinate of the area to paint to
     * @param w Width of the area to paint to
     * @param h Height of the area to paint to
     */
    public void paintButtonBackground(SynthContext context,
                                      Graphics g, int x, int y,
                                      int w, int h) {
        paintBackground(context, g, x, y, w, h, null);
    }

    /**
     * Paints the border of a button.
     *
     * @param context SynthContext identifying the <code>JComponent</code> and
     *        <code>Region</code> to paint to
     * @param g <code>Graphics</code> to paint to