|
1
23
24 package swingwt.awt;
25
26 import swingwt.awt.font.*;
27 import swingwt.awt.geom.*;
28
29 import swingwtx.swing.SwingUtilities;
30
31 public class FontMetrics {
32
33 protected Font font;
34
35
36 protected org.eclipse.swt.graphics.GC gc = null;
37
38 protected org.eclipse.swt.graphics.Image im = null;
39
40 protected FontMetrics(Font font) { this.font = font; }
41
42 private void checkGC() {
43 SwingUtilities.invokeSync(new Runnable  () {
44 public void run() {
45 if (gc != null) return;
46 im = new org.eclipse.swt.graphics.Image(swingwtx.swing.SwingWTUtils.getDisplay(), 100, 100);
47 gc = new org.eclipse.swt.graphics.GC(im);
48 }
49 });
50 }
51
52 public Font getFont() { return font; }
53 public int getLeading() { return 0; }
54 public int getAscent() {
55 final int[] ret = new int[1];
56 SwingUtilities.invokeSync(new Runnable () {
57 public void run() {
58 checkGC();
59 ret[0] = gc.stringExtent("I").y;
60 }
61 });
62 return ret[0];
63 }
64 public int getDescent() { return 0; }
65 public int getHeight() { return getLeading() + getAscent() + getDescent(); }
66 public int getMaxAscent() { return getAscent(); }
67 public int getMaxDescent() { return getDescent(); }
68 public int getMaxDecent() { return getMaxDescent(); }
69 public int getMaxAdvance() { return -1; }
70 public int charWidth(int ch) { return charWidth((char)ch); }
71 public int charWidth(char ch) {
72 if (ch < 256) {
73 return getWidths()[ch];
74 }
75 char data[] = {ch};
76 return charsWidth(data, 0, 1);
77 }
78 public int stringWidth(final String str) {
79 final int[] ret = new int[1];
80 SwingUtilities.invokeSync(new Runnable () {
81 public void run() {
82 checkGC();
83 ret[0] = gc.stringExtent(str).x;
84 }
85 });
86 return ret[0];
87 }
88 public int charsWidth(char data[], int off, int len) {
89 return stringWidth(new String (data, off, len));
90 }
91 public int bytesWidth(byte data[], int off, int len) {
92 return stringWidth(new String (data).substring(off, off+len));
93 }
94 public int[] getWidths() {
95 int widths[] = new int[256];
96 for (char ch = 0 ; ch < 256 ; ch++) {
97 widths[ch] = charWidth(ch);
98 }
99 return widths;
100 }
101 public boolean hasUniformLineMetrics() { return false; }
102
103 public LineMetrics getLineMetrics( String str, Graphics context) {
104 return new LineMetrics(str.length(), getHeight());
105 }
106
107 public LineMetrics getLineMetrics( String str,
108 int beginIndex, int limit,
109 Graphics context) {
110 return new LineMetrics(limit - beginIndex, getHeight());
111 }
112
113 public LineMetrics getLineMetrics(char [] chars,
114 int beginIndex, int limit,
115 Graphics context) {
116 return getLineMetrics(
117 new String (chars), beginIndex, limit, context);
118 }
119 public Rectangle2D getStringBounds(final String str, Graphics context) {
120 final Rectangle[] ret = new Rectangle[1];
121 SwingUtilities.invokeSync(new Runnable () {
122 public void run() {
123 checkGC();
124 org.eclipse.swt.graphics.Point p = gc.stringExtent(str);
125 ret[0] = new Rectangle(p.x, p.y);
126 }
127 });
128 return ret[0];
129 }
130 public Rectangle2D getStringBounds( String str,
131 int beginIndex, int limit,
132 Graphics context) {
133 return getStringBounds(str, context);
134 }
135 public Rectangle2D getStringBounds( char [] chars,
136 int beginIndex, int limit,
137 Graphics context) {
138 return getStringBounds(new String (chars), context);
139 }
140 public Rectangle2D getMaxCharBounds(Graphics context) {
141 return new Rectangle(0, 0);
142 }
143 public String toString() {
144 return getClass().getName() +
145 "[font=" + getFont() +
146 "ascent=" + getAscent() +
147 ", descent=" + getDescent() +
148 ", height=" + getHeight() + "]";
149 }
150
151 }
152 |
Popular Tags |
Java API By Example, From Geeks To Geeks.