public static void setHexadecimalInputFilter(
JTextComponent textComponent, int maximumInputLength) {
PlainDocument plainDocument = (PlainDocument) textComponent.getDocument();
plainDocument.setDocumentFilter(new HexadecimalInputFilter(maximumInputLength));
String text = textComponent.getText();
text = trimHexadecimal(text);
if (text.length() > maximumInputLength) {
textComponent.setText(text.substring(text.length() - maximumInputLength, text.length()));
} else {
while (text.length() < maximumInputLength) {
text = "0" + text;
}
textComponent.setText(text);
}
}
@Override
protected Document createDefaultModel() {
PlainDocument d = (PlainDocument) super.createDefaultModel();
d.setDocumentFilter(
new DocumentFilter() {
@Override
public void insertString(FilterBypass fb, int offset, String string, AttributeSet attr)
throws BadLocationException {
replace(fb, offset, 0, string, attr);
}
@Override
public void remove(FilterBypass fb, int offset, int length) throws BadLocationException {
replace(fb, offset, length, "", null);
}
@Override
public void replace(
FilterBypass fb, int replOffset, int replLen, String string, AttributeSet attrs)
throws BadLocationException {
String s = JMathTextField.this.getText();
boolean insertedDummyChar = false;
boolean insertedBrackets = false;
String replStr = s.substring(replOffset, replOffset + replLen);
if (string.matches(" |\\)")
&& replOffset + 1 <= s.length()
&& s.substring(replOffset, replOffset + 1).equals(string)) {
JMathTextField.this.setCaretPosition(replOffset + 1);
return;
}
if (string.isEmpty() && replStr.equals(" ")) {
JMathTextField.this.setCaretPosition(replOffset);
return;
}
string = string.replace(" ", "");
if (string.isEmpty() && replStr.equals("(")) {
int count = 1;
while (replOffset + replLen < s.length()) {
replLen++;
replStr =
s.substring(
replOffset,
replOffset + replLen); // just update in case we need it later again
if (replStr.charAt(0) == '(') count++;
else if (replStr.charAt(0) == ')') count--;
if (count == 0) break;
}
} else if (string.isEmpty() && replStr.equals(")")) {
int count = -1;
while (replOffset > 0) {
replOffset--;
replLen++;
replStr = s.substring(replOffset, replOffset + replLen);
if (replStr.charAt(0) == '(') count++;
else if (replStr.charAt(0) == ')') count--;
if (count == 0) break;
}
}
if (string.matches("\\+|-|\\*|/|\\^|=")) {
if (s.substring(replOffset + replLen).matches("( *(\\+|-|∙|/|\\^|=|\\)).*)|")) {
string = string + "_";
insertedDummyChar = true;
} else if (s.substring(replOffset + replLen).matches(" .*")) {
string = "_" + string;
insertedDummyChar = true;
}
} else if (string.matches("\\(")) {
if (Utils.reveresedString(s.substring(0, replOffset))
.matches("( )*([^\\+\\-∙/\\^= ].*|)")
|| replStr.equals("_")) {
string = "(_)";
insertedDummyChar = true;
} else if (!replStr.isEmpty()) {
string = "(" + replStr + ")";
insertedBrackets = true;
} else return; // ignore this
} else if (string.matches("\\)")) return; // ignore that
// situation: A = B, press DEL -> make it A = _
if (string.isEmpty()
&& Utils.reveresedString(s.substring(0, replOffset))
.matches("( )*(\\+|-|∙|/|\\^|=).*")
&& !replStr.matches("_|\\+|-|∙|/|\\^|=")) {
string = "_";
insertedDummyChar = true;
} else if (string.isEmpty()
&& Utils.reveresedString(s.substring(0, replOffset))
.matches("( )*(\\+|-|∙|/|\\^|=).*")
&& replStr.equals("_")) {
while (s.substring(replOffset - 1, replOffset).equals(" ")) {
replOffset--;
replLen++;
}
replOffset--;
replLen++; // go just before the op
// just update in case we need it later again
// noinspection UnusedAssignment
replStr = s.substring(replOffset, replOffset + replLen);
}
setNewString(
fb, s.substring(0, replOffset) + string + s.substring(replOffset + replLen));
if (insertedDummyChar) {
int p = JMathTextField.this.getText().indexOf('_');
if (p >= 0) {
JMathTextField.this.setCaretPosition(p);
JMathTextField.this.moveCaretPosition(p + 1);
}
} else if (insertedBrackets) {
// move just before the ')'
if (JMathTextField.this.getCaretPosition() > 0)
JMathTextField.this.setCaretPosition(JMathTextField.this.getCaretPosition() - 1);
}
}
synchronized void setNewString(FilterBypass fb, String tempStr)
throws BadLocationException {
operatorTree = OTParser.parse(tempStr, null);
JMathTextField.this.updateByOpTree(fb);
}
});
return d;
}