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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2016 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ---------------
* VTextIcon.java
* ---------------
*/
package org.jpedal.examples.viewer.gui;
import java.awt.Component;
import java.awt.FontMetrics;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
import javax.swing.Icon;
/**
VTextIcon is an Icon implementation which draws a short string vertically.
It's useful for JTabbedPanes with LEFT or RIGHT tabs but can be used in any
component which supports Icons, such as JLabel or JButton
You can provide a hint to indicate whether to rotate the string
to the left or right, or not at all, and it checks to make sure
that the rotation is legal for the given string
(for example, Chinese/Japanese/Korean scripts have special rules when
drawn vertically and should never be rotated)
*/
public class VTextIcon implements Icon, PropertyChangeListener {
final String fLabel;
String[] fCharStrings; // for efficiency, break the fLabel into one-char strings to be passed to drawString
int[] fCharWidths; // Roman characters should be centered when not rotated (Japanese fonts are monospaced)
int[] fPosition; // Japanese half-height characters need to be shifted when drawn vertically
int fWidth, fHeight, fCharHeight, fDescent; // Cached for speed
final int fRotation;
final Component fComponent;
static final int POSITION_NORMAL = 0;
static final int POSITION_TOP_RIGHT = 1;
static final int POSITION_FAR_TOP_RIGHT = 2;
//public static final int ROTATE_DEFAULT = 0x00;
public static final int ROTATE_NONE = 0x01;
public static final int ROTATE_LEFT = 0x02;
public static final int ROTATE_RIGHT = 0x04;
/**
* Creates a VTextIcon for the specified component
* with the specified label.
* It sets the orientation to the provided value if it's legal for the string
* @see #verifyRotation
*/
public VTextIcon(final Component component, final String label, final int rotateHint) {
fComponent = component;
fLabel = label;
fRotation = verifyRotation(label, rotateHint);
calcDimensions();
fComponent.addPropertyChangeListener(this);
}
@Override
public String toString(){
return fLabel;
}
/**
* Checks for changes to the font on the fComponent
* so that it can invalidate the layout if the size changes
*/
@Override
public void propertyChange(final PropertyChangeEvent e) {
final String prop = e.getPropertyName();
if("font".equals(prop)) {
recalcDimensions();
}
}
/**
* Calculates the dimensions. If they've changed,
* invalidates the component
*/
void recalcDimensions() {
final int wOld = fWidth;
final int hOld = fHeight;
calcDimensions();
if (wOld != fWidth || hOld != fHeight) {
fComponent.invalidate();
}
}
void calcDimensions() {
final FontMetrics fm = fComponent.getFontMetrics(fComponent.getFont());
fCharHeight = fm.getAscent() + fm.getDescent();
fDescent = fm.getDescent();
if (fRotation == ROTATE_NONE) {
final int len = fLabel.length();
final char[] data = new char[len];
fLabel.getChars(0, len, data, 0);
// if not rotated, width is that of the widest char in the string
fWidth = 0;
// we need an array of one-char strings for drawString
fCharStrings = new String[len];
fCharWidths = new int[len];
fPosition = new int[len];
char ch;
for (int i = 0; i < len; i++) {
ch = data[i];
fCharWidths[i] = fm.charWidth(ch);
if (fCharWidths[i] > fWidth) {
fWidth = fCharWidths[i];
}
fCharStrings[i] = new String(data, i, 1);
// small kana and punctuation
if (sDrawsInTopRight.indexOf(ch) >= 0) // if ch is in sDrawsInTopRight
{
fPosition[i] = POSITION_TOP_RIGHT;
} else if (sDrawsInFarTopRight.indexOf(ch) >= 0) {
fPosition[i] = POSITION_FAR_TOP_RIGHT;
} else {
fPosition[i] = POSITION_NORMAL;
}
}
// and height is the font height * the char count, + one extra leading at the bottom
fHeight = fCharHeight * len + fDescent;
}
else {
// if rotated, width is the height of the string
fWidth = fCharHeight;
// and height is the width, plus some buffer space
fHeight = fm.stringWidth(fLabel) + 2*kBufferSpace;
}
}
/**
* Draw the icon at the specified location. Icon implementations
* may use the Component argument to get properties useful for
* painting, e.g. the foreground or background color.
*/
@Override
public void paintIcon(final Component c, final Graphics g, final int x, final int y) {
// We don't insist that it be on the same Component
g.setColor(c.getForeground());
g.setFont(c.getFont());
if (fRotation == ROTATE_NONE) {
int yPos = y + fCharHeight;
for (int i = 0; i < fCharStrings.length; i++) {
// Special rules for Japanese - "half-height" characters (like ya, yu, yo in combinations)
// should draw in the top-right quadrant when drawn vertically
// - they draw in the bottom-left normally
final int tweak;
switch (fPosition[i]) {
case POSITION_NORMAL:
// Roman fonts should be centered. Japanese fonts are always monospaced.
g.drawString(fCharStrings[i], x+((fWidth-fCharWidths[i])/2), yPos);
break;
case POSITION_TOP_RIGHT:
tweak = fCharHeight/3; // Should be 2, but they aren't actually half-height
g.drawString(fCharStrings[i], x+(tweak/2), yPos-tweak);
break;
case POSITION_FAR_TOP_RIGHT:
tweak = fCharHeight - fCharHeight/3;
g.drawString(fCharStrings[i], x+(tweak/2), yPos-tweak);
break;
}
yPos += fCharHeight;
}
}
else if (fRotation == ROTATE_LEFT) {
g.translate(x+fWidth,y+fHeight);
((Graphics2D)g).rotate(-NINETY_DEGREES);
g.drawString(fLabel, kBufferSpace, -fDescent);
((Graphics2D)g).rotate(NINETY_DEGREES);
g.translate(-(x+fWidth),-(y+fHeight));
}
else if (fRotation == ROTATE_RIGHT) {
g.translate(x,y);
((Graphics2D)g).rotate(NINETY_DEGREES);
g.drawString(fLabel, kBufferSpace, -fDescent);
((Graphics2D)g).rotate(-NINETY_DEGREES);
g.translate(-x,-y);
}
}
/**
* Returns the icon's width.
*
* @return an int specifying the fixed width of the icon.
*/
@Override
public int getIconWidth() {
return fWidth;
}
/**
* Returns the icon's height.
*
* @return an int specifying the fixed height of the icon.
*/
@Override
public int getIconHeight() {
return fHeight;
}
/**
verifyRotation
returns the best rotation for the string (ROTATE_NONE, ROTATE_LEFT, ROTATE_RIGHT)
This is public static so you can use it to test a string without creating a VTextIcon
from http://www.unicode.org/unicode/reports/tr9/tr9-3.html
When setting text using the Arabic script in vertical lines,
it is more common to employ a horizontal baseline that
is rotated by 90 degrees counterclockwise so that the characters
are ordered from top to bottom. Latin text and numbers
may be rotated 90 degrees clockwise so that the characters
are also ordered from top to bottom.
Rotation rules
- Roman can rotate left, right, or none - default right (counterclockwise)
- CJK can't rotate
- Arabic must rotate - default left (clockwise)
from the online edition of _The Unicode Standard, Version 3.0_, file ch10.pdf page 4
Ideographs are found in three blocks of the Unicode Standard...
U+4E00-U+9FFF, U+3400-U+4DFF, U+F900-U+FAFF
Hiragana is U+3040-U+309F, katakana is U+30A0-U+30FF
from http://www.unicode.org/unicode/faq/writingdirections.html
East Asian scripts are frequently written in vertical lines
which run from top-to-bottom and are arrange columns either
from left-to-right (Mongolian) or right-to-left (other scripts).
Most characters use the same shape and orientation when displayed
horizontally or vertically, but many punctuation characters
will change their shape when displayed vertically.
Letters and words from other scripts are generally rotated through
ninety degree angles so that they, too, will read from top to bottom.
That is, letters from left-to-right scripts will be rotated clockwise
and letters from right-to-left scripts counterclockwise, both
through ninety degree angles.
Unlike the bidirectional case, the choice of vertical layout
is usually treated as a formatting style; therefore,
the Unicode Standard does not define default rendering behavior
for vertical text nor provide directionality controls designed to override such behavior
*/
public static int verifyRotation(final String label, final int rotateHint) {
boolean hasCJK = false;
boolean hasMustRotate = false; // Arabic, etc
final int len = label.length();
final char[] data = new char[len];
char ch;
label.getChars(0, len, data, 0);
for (int i = 0; i < len; i++) {
ch = data[i];
if ((ch >= '\u4E00' && ch <= '\u9FFF') ||
(ch >= '\u3400' && ch <= '\u4DFF') ||
(ch >= '\uF900' && ch <= '\uFAFF') ||
(ch >= '\u3040' && ch <= '\u309F') ||
(ch >= '\u30A0' && ch <= '\u30FF') ) {
hasCJK = true;
}
if ((ch >= '\u0590' && ch <= '\u05FF') || // Hebrew
(ch >= '\u0600' && ch <= '\u06FF') || // Arabic
(ch >= '\u0700' && ch <= '\u074F') ) // Syriac
{
hasMustRotate = true;
}
}
// If you mix Arabic with Chinese, you're on your own
if (hasCJK) {
return DEFAULT_CJK;
}
final int legal = hasMustRotate ? LEGAL_MUST_ROTATE : LEGAL_ROMAN;
if ((rotateHint & legal) > 0) {
return rotateHint;
}
// The hint wasn't legal, or it was zero
return hasMustRotate ? DEFAULT_MUST_ROTATE : DEFAULT_ROMAN;
}
// The small kana characters and Japanese punctuation that draw in the top right quadrant:
// small a, i, u, e, o, tsu, ya, yu, yo, wa (katakana only) ka ke
static final String sDrawsInTopRight =
"\u3041\u3043\u3045\u3047\u3049\u3063\u3083\u3085\u3087\u308E" + // hiragana
"\u30A1\u30A3\u30A5\u30A7\u30A9\u30C3\u30E3\u30E5\u30E7\u30EE\u30F5\u30F6"; // katakana
static final String sDrawsInFarTopRight = "\u3001\u3002"; // comma, full stop
static final int DEFAULT_CJK = ROTATE_NONE;
static final int LEGAL_ROMAN = ROTATE_NONE | ROTATE_LEFT | ROTATE_RIGHT;
static final int DEFAULT_ROMAN = ROTATE_RIGHT;
static final int LEGAL_MUST_ROTATE = ROTATE_LEFT | ROTATE_RIGHT;
static final int DEFAULT_MUST_ROTATE = ROTATE_LEFT;
static final double NINETY_DEGREES = Math.toRadians(90.0);
static final int kBufferSpace = 5;
}