Text edit and maxLength

[vieraci]

Can text edit widget have maxLength like the line edit widget ?

[marcel]

No, but you can count the characters in it when the textChanged() signal is emitted and disable the input if the count reaches a certain limit.

Regards

[vermarajeev]

No, but you can count the characters in it when the textChanged() signal is emitted and disable the input if the count reaches a certain limit.

Regards

The other option would be to filter the event on TextEdit and checking QString(textEdit->text).length() to certain MAX limit.

Thanks

[oscar]

Just for convenience, here is an example of a QTextEdit child class implementing the missing maxLength feature.

Regards,
Oscar

#include <QtCore>
#include <QtGui>
#include "TextEdit.hpp"
 
TextEdit::TextEdit() : QPlainTextEdit() {
	connect(this, SIGNAL(textChanged()), this, SLOT(myTextChanged()));
}
 
TextEdit::TextEdit(int maxChar) : QPlainTextEdit() {
	this->maxChar = maxChar;
	connect(this, SIGNAL(textChanged()), this, SLOT(myTextChanged()));
}
 
int TextEdit::getMaxChar() {
	return maxChar;
}
 
void TextEdit::setMaxChar(int maxChar) {
	this->maxChar = maxChar;
}
 
void TextEdit::myTextChanged() {
	if (QPlainTextEdit::toPlainText().length()>maxChar) {
		QPlainTextEdit::setPlainText(QPlainTextEdit::toPlainText().left(QPlainTextEdit::toPlainText().length()-1));
		QPlainTextEdit::moveCursor(QTextCursor::End);
		QMessageBox::information(NULL, QString::fromUtf8("Warning"),
					  QString::fromUtf8("Warning: no more then ") + QString::number(maxChar) + QString::fromUtf8(" characters in this field"),
							  QString::fromUtf8("Ok"));
	}
}

#include <QtCore>
#include <QtGui>
#include "TextEdit.hpp"

TextEdit::TextEdit() : QPlainTextEdit() {
	connect(this, SIGNAL(textChanged()), this, SLOT(myTextChanged()));
}

TextEdit::TextEdit(int maxChar) : QPlainTextEdit() {
	this->maxChar = maxChar;
	connect(this, SIGNAL(textChanged()), this, SLOT(myTextChanged()));
}

int TextEdit::getMaxChar() {
	return maxChar;
}

void TextEdit::setMaxChar(int maxChar) {
	this->maxChar = maxChar;
}

void TextEdit::myTextChanged() {
	if (QPlainTextEdit::toPlainText().length()>maxChar) {
		QPlainTextEdit::setPlainText(QPlainTextEdit::toPlainText().left(QPlainTextEdit::toPlainText().length()-1));
		QPlainTextEdit::moveCursor(QTextCursor::End);
		QMessageBox::information(NULL, QString::fromUtf8("Warning"),
					  QString::fromUtf8("Warning: no more then ") + QString::number(maxChar) + QString::fromUtf8(" characters in this field"),
							  QString::fromUtf8("Ok"));
	}
}

To copy to clipboard, switch view to plain text mode 

[enrique.fe]

It works!

int maximum = 500;
if (ui.textEdit->toPlainText().length() > maximum) {
ui.textEdit->textCursor().deletePreviousChar();
}