public boolean prev() {
if (offset > 0) {
--offset;
return true;
}
if (line.previous() != null) {
line = line.previous();
offset = line.length();
return true;
}
return false;
}
/**
* Appends the given line to this block.
*
* @param line Line to append.
*/
public void appendLine(final Line line) {
if (this.lineTail == null) {
this.lines = this.lineTail = line;
} else {
this.lineTail.nextEmpty = line.isEmpty;
line.prevEmpty = this.lineTail.isEmpty;
line.previous = this.lineTail;
this.lineTail.next = line;
this.lineTail = line;
}
}
/**
* Removes the given line from this block.
*
* @param line Line to remove.
*/
public void removeLine(final Line line) {
if (line.previous == null) {
this.lines = line.next;
} else {
line.previous.next = line.next;
}
if (line.next == null) {
this.lineTail = line.previous;
} else {
line.next.previous = line.previous;
}
line.previous = line.next = null;
}
public final Line getPreviousLine() {
return line.previous();
}
public boolean atStart() {
if (line.previous() != null) return false;
if (offset > 0) return false;
return true;
}