/**
* Converts a y co-ordinate to a line index.
*
* @param y The y co-ordinate
*/
public int yToLine(int y) {
FontMetrics fm = painter.getFontMetrics();
int height = fm.getHeight();
return Math.max(0, Math.min(getLineCount() - 1, y / height + firstLine));
}
/**
* Converts an x co-ordinate to an offset within a line.
*
* @param line The line
* @param x The x co-ordinate
*/
public int xToOffset(int line, int x) {
TokenMarker tokenMarker = getTokenMarker();
/* Use painter's cached info for speed */
FontMetrics fm = painter.getFontMetrics();
getLineText(line, lineSegment);
char[] segmentArray = lineSegment.array;
int segmentOffset = lineSegment.offset;
int segmentCount = lineSegment.count;
int width = horizontalOffset;
if (tokenMarker == null) {
for (int i = 0; i < segmentCount; i++) {
char c = segmentArray[i + segmentOffset];
int charWidth;
if (c == '\t') charWidth = (int) painter.nextTabStop(width, i) - width;
else charWidth = fm.charWidth(c);
if (painter.isBlockCaretEnabled()) {
if (x - charWidth <= width) return i;
} else {
if (x - charWidth / 2 <= width) return i;
}
width += charWidth;
}
return segmentCount;
} else {
Token tokens;
if (painter.currentLineIndex == line && painter.currentLineTokens != null)
tokens = painter.currentLineTokens;
else {
painter.currentLineIndex = line;
tokens = painter.currentLineTokens = tokenMarker.markTokens(lineSegment, line);
}
int offset = 0;
Toolkit toolkit = painter.getToolkit();
Font defaultFont = painter.getFont();
SyntaxStyle[] styles = painter.getStyles();
for (; ; ) {
byte id = tokens.id;
if (id == Token.END) return offset;
if (id == Token.NULL) fm = painter.getFontMetrics();
else fm = styles[id].getFontMetrics(defaultFont);
int length = tokens.length;
for (int i = 0; i < length; i++) {
char c = segmentArray[segmentOffset + offset + i];
int charWidth;
if (c == '\t') charWidth = (int) painter.nextTabStop(width, offset + i) - width;
else charWidth = fm.charWidth(c);
if (painter.isBlockCaretEnabled()) {
if (x - charWidth <= width) return offset + i;
} else {
if (x - charWidth / 2 <= width) return offset + i;
}
width += charWidth;
}
offset += length;
tokens = tokens.next;
}
}
}
/**
* Converts a line index to a y co-ordinate.
*
* @param line The line
*/
public int lineToY(int line) {
FontMetrics fm = painter.getFontMetrics();
return (line - firstLine) * fm.getHeight() - (fm.getLeading() + fm.getMaxDescent());
}