/*
* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
*
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*/
package javax.swing.text.html;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Insets;
import java.awt.Polygon;
import java.awt.Rectangle;
import java.awt.Shape;
import java.util.HashMap;
import java.util.Map;
import javax.swing.border.AbstractBorder;
import javax.swing.text.AttributeSet;
import javax.swing.text.View;
import javax.swing.text.html.CSS.Attribute;
import javax.swing.text.html.CSS.BorderStyle;
import javax.swing.text.html.CSS.BorderWidthValue;
import javax.swing.text.html.CSS.ColorValue;
import javax.swing.text.html.CSS.CssValue;
import javax.swing.text.html.CSS.LengthValue;
import javax.swing.text.html.CSS.Value;
/**
* CSS-style borders for HTML elements.
*
* @author Sergey Groznyh
*/
class CSSBorder extends AbstractBorder {
/** Indices for the attribute groups. */
final static int COLOR = 0, STYLE = 1, WIDTH = 2;
/** Indices for the box sides within the attribute group. */
final static int TOP = 0, RIGHT = 1, BOTTOM = 2, LEFT = 3;
/** The attribute groups. */
final static Attribute[][] ATTRIBUTES = {
{ Attribute.BORDER_TOP_COLOR, Attribute.BORDER_RIGHT_COLOR,
Attribute.BORDER_BOTTOM_COLOR, Attribute.BORDER_LEFT_COLOR, },
{ Attribute.BORDER_TOP_STYLE, Attribute.BORDER_RIGHT_STYLE,
Attribute.BORDER_BOTTOM_STYLE, Attribute.BORDER_LEFT_STYLE, },
{ Attribute.BORDER_TOP_WIDTH, Attribute.BORDER_RIGHT_WIDTH,
Attribute.BORDER_BOTTOM_WIDTH, Attribute.BORDER_LEFT_WIDTH, },
};
/** Parsers for the border properties. */
final static CssValue PARSERS[] = {
new ColorValue(), new BorderStyle(), new BorderWidthValue(null, 0),
};
/** Default values for the border properties. */
final static Object[] DEFAULTS = {
Attribute.BORDER_COLOR, // marker: value will be computed on request
PARSERS[1].parseCssValue(Attribute.BORDER_STYLE.getDefaultValue()),
PARSERS[2].parseCssValue(Attribute.BORDER_WIDTH.getDefaultValue()),
};
/** Attribute set containing border properties. */
final AttributeSet attrs;
/**
* Initialize the attribute set.
*/
CSSBorder(AttributeSet attrs) {
this.attrs = attrs;
}
/**
* Return the border color for the given side.
*/
private Color getBorderColor(int side) {
Object o = attrs.getAttribute(ATTRIBUTES[COLOR][side]);
ColorValue cv;
if (o instanceof ColorValue) {
cv = (ColorValue) o;
} else {
// Marker for the default value. Use 'color' property value as the
// computed value of the 'border-color' property (CSS2 8.5.2)
cv = (ColorValue) attrs.getAttribute(Attribute.COLOR);
if (cv == null) {
cv = (ColorValue) PARSERS[COLOR].parseCssValue(
Attribute.COLOR.getDefaultValue());
}
}
return cv.getValue();
}
/**
* Return the border width for the given side.
*/
private int getBorderWidth(int side) {
int width = 0;
BorderStyle bs = (BorderStyle) attrs.getAttribute(
ATTRIBUTES[STYLE][side]);
if ((bs != null) && (bs.getValue() != Value.NONE)) {
// The 'border-style' value of "none" forces the computed value
// of 'border-width' to be 0 (CSS2 8.5.3)
LengthValue bw = (LengthValue) attrs.getAttribute(
ATTRIBUTES[WIDTH][side]);
if (bw == null) {
bw = (LengthValue) DEFAULTS[WIDTH];
}
width = (int) bw.getValue(true);
}
return width;
}
/**
* Return an array of border widths in the TOP, RIGHT, BOTTOM, LEFT order.
*/
private int[] getWidths() {
int[] widths = new int[4];
for (int i = 0; i < widths.length; i++) {
widths[i] = getBorderWidth(i);
}
return widths;
}
/**
* Return the border style for the given side.
*/
private Value getBorderStyle(int side) {
BorderStyle style =
(BorderStyle) attrs.getAttribute(ATTRIBUTES[STYLE][side]);
if (style == null) {
style = (BorderStyle) DEFAULTS[STYLE];
}
return style.getValue();
}
/**
* Return border shape for {@code side} as if the border has zero interior
* length. Shape start is at (0,0); points are added clockwise.
*/
private Polygon getBorderShape(int side) {
Polygon shape = null;
int[] widths = getWidths();
if (widths[side] != 0) {
shape = new Polygon(new int[4], new int[4], 0);
shape.addPoint(0, 0);
shape.addPoint(-widths[(side + 3) % 4], -widths[side]);
shape.addPoint(widths[(side + 1) % 4], -widths[side]);
shape.addPoint(0, 0);
}
return shape;
}
/**
* Return the border painter appropriate for the given side.
*/
private BorderPainter getBorderPainter(int side) {
Value style = getBorderStyle(side);
return borderPainters.get(style);
}
/**
* Return the color with brightness adjusted by the specified factor.
*
* The factor values are between 0.0 (no change) and 1.0 (turn into white).
* Negative factor values decrease brigthness (ie, 1.0 turns into black).
*/
static Color getAdjustedColor(Color c, double factor) {
double f = 1 - Math.min(Math.abs(factor), 1);
double inc = (factor > 0 ? 255 * (1 - f) : 0);
return new Color((int) (c.getRed() * f + inc),
(int) (c.getGreen() * f + inc),
(int) (c.getBlue() * f + inc));
}
/* The javax.swing.border.Border methods. */
public Insets getBorderInsets(Component c, Insets insets) {
int[] widths = getWidths();
insets.set(widths[TOP], widths[LEFT], widths[BOTTOM], widths[RIGHT]);
return insets;
}
public void paintBorder(Component c, Graphics g,
int x, int y, int width, int height) {
if (!(g instanceof Graphics2D)) {
return;
}
Graphics2D g2 = (Graphics2D) g.create();
int[] widths = getWidths();
// Position and size of the border interior.
int intX = x + widths[LEFT];
int intY = y + widths[TOP];
int intWidth = width - (widths[RIGHT] + widths[LEFT]);
int intHeight = height - (widths[TOP] + widths[BOTTOM]);
// Coordinates of the interior corners, from NW clockwise.
int[][] intCorners = {
{ intX, intY },
{ intX + intWidth, intY },
{ intX + intWidth, intY + intHeight },
{ intX, intY + intHeight, },
};
// Draw the borders for all sides.
for (int i = 0; i < 4; i++) {
Value style = getBorderStyle(i);
Polygon shape = getBorderShape(i);
if ((style != Value.NONE) && (shape != null)) {
int sideLength = (i % 2 == 0 ? intWidth : intHeight);
// "stretch" the border shape by the interior area dimension
shape.xpoints[2] += sideLength;
shape.xpoints[3] += sideLength;
Color color = getBorderColor(i);
BorderPainter painter = getBorderPainter(i);
double angle = i * Math.PI / 2;
g2.setClip(g.getClip()); // Restore initial clip
g2.translate(intCorners[i][0], intCorners[i][1]);
g2.rotate(angle);
g2.clip(shape);
painter.paint(shape, g2, color, i);
g2.rotate(-angle);
g2.translate(-intCorners[i][0], -intCorners[i][1]);
}
}
g2.dispose();
}
/* Border painters. */
interface BorderPainter {
/**
* The painter should paint the border as if it were at the top and the
* coordinates of the NW corner of the interior area is (0, 0). The
* caller is responsible for the appropriate affine transformations.
*
* Clip is set by the caller to the exact border shape so it's safe to
* simply draw into the shape's bounding rectangle.
*/
void paint(Polygon shape, Graphics g, Color color, int side);
}
/**
* Painter for the "none" and "hidden" CSS border styles.
*/
static class NullPainter implements BorderPainter {
public void paint(Polygon shape, Graphics g, Color color, int side) {
// Do nothing.
}
}
/**
* Painter for the "solid" CSS border style.
*/
static class SolidPainter implements BorderPainter {
public void paint(Polygon shape, Graphics g, Color color, int side) {
g.setColor(color);
g.fillPolygon(shape);
}
}
/**
* Defines a method for painting strokes in the specified direction using
* the given length and color patterns.
*/
abstract static class StrokePainter implements BorderPainter {
/**
* Paint strokes repeatedly using the given length and color patterns.
*/
void paintStrokes(Rectangle r, Graphics g, int axis,
int[] lengthPattern, Color[] colorPattern) {
boolean xAxis = (axis == View.X_AXIS);
int start = 0;
int end = (xAxis ? r.width : r.height);
while (start < end) {
for (int i = 0; i < lengthPattern.length; i++) {
if (start >= end) {
break;
}
int length = lengthPattern[i];
Color c = colorPattern[i];
if (c != null) {
int x = r.x + (xAxis ? start : 0);
int y = r.y + (xAxis ? 0 : start);
int width = xAxis ? length : r.width;
int height = xAxis ? r.height : length;
g.setColor(c);
g.fillRect(x, y, width, height);
}
start += length;
}
}
}
}
/**
* Painter for the "double" CSS border style.
*/
static class DoublePainter extends StrokePainter {
public void paint(Polygon shape, Graphics g, Color color, int side) {
Rectangle r = shape.getBounds();
int length = Math.max(r.height / 3, 1);
int[] lengthPattern = { length, length };
Color[] colorPattern = { color, null };
paintStrokes(r, g, View.Y_AXIS, lengthPattern, colorPattern);
}
}
/**
* Painter for the "dotted" and "dashed" CSS border styles.
*/
static class DottedDashedPainter extends StrokePainter {
final int factor;
DottedDashedPainter(int factor) {
this.factor = factor;
}
public void paint(Polygon shape, Graphics g, Color color, int side) {
Rectangle r = shape.getBounds();
int length = r.height * factor;
int[] lengthPattern = { length, length };
Color[] colorPattern = { color, null };
paintStrokes(r, g, View.X_AXIS, lengthPattern, colorPattern);
}
}
/**
* Painter that defines colors for "shadow" and "light" border sides.
*/
abstract static class ShadowLightPainter extends StrokePainter {
/**
* Return the "shadow" border side color.
*/
static Color getShadowColor(Color c) {
return CSSBorder.getAdjustedColor(c, -0.3);
}
/**
* Return the "light" border side color.
*/
static Color getLightColor(Color c) {
return CSSBorder.getAdjustedColor(c, 0.7);
}
}
/**
* Painter for the "groove" and "ridge" CSS border styles.
*/
static class GrooveRidgePainter extends ShadowLightPainter {
final Value type;
GrooveRidgePainter(Value type) {
this.type = type;
}
public void paint(Polygon shape, Graphics g, Color color, int side) {
Rectangle r = shape.getBounds();
int length = Math.max(r.height / 2, 1);
int[] lengthPattern = { length, length };
Color[] colorPattern =
((side + 1) % 4 < 2) == (type == Value.GROOVE) ?
new Color[] { getShadowColor(color), getLightColor(color) } :
new Color[] { getLightColor(color), getShadowColor(color) };
paintStrokes(r, g, View.Y_AXIS, lengthPattern, colorPattern);
}
}
/**
* Painter for the "inset" and "outset" CSS border styles.
*/
static class InsetOutsetPainter extends ShadowLightPainter {
Value type;
InsetOutsetPainter(Value type) {
this.type = type;
}
public void paint(Polygon shape, Graphics g, Color color, int side) {
g.setColor(((side + 1) % 4 < 2) == (type == Value.INSET) ?
getShadowColor(color) : getLightColor(color));
g.fillPolygon(shape);
}
}
/**
* Add the specified painter to the painters map.
*/
static void registerBorderPainter(Value style, BorderPainter painter) {
borderPainters.put(style, painter);
}
/** Map the border style values to the border painter objects. */
static Map<Value, BorderPainter> borderPainters =
new HashMap<Value, BorderPainter>();
/* Initialize the border painters map with the pre-defined values. */
static {
registerBorderPainter(Value.NONE, new NullPainter());
registerBorderPainter(Value.HIDDEN, new NullPainter());
registerBorderPainter(Value.SOLID, new SolidPainter());
registerBorderPainter(Value.DOUBLE, new DoublePainter());
registerBorderPainter(Value.DOTTED, new DottedDashedPainter(1));
registerBorderPainter(Value.DASHED, new DottedDashedPainter(3));
registerBorderPainter(Value.GROOVE, new GrooveRidgePainter(Value.GROOVE));
registerBorderPainter(Value.RIDGE, new GrooveRidgePainter(Value.RIDGE));
registerBorderPainter(Value.INSET, new InsetOutsetPainter(Value.INSET));
registerBorderPainter(Value.OUTSET, new InsetOutsetPainter(Value.OUTSET));
}
}