QApplication::clipboard not read textCursor cut

[patrik08]

1- If i cut text on QTextEdit subclass ...
QClipboard *netag = QApplication::clipboard();
QString textclip = netag->text(QClipboard::Selection);

QClipboard cant not read null string .... why?

2- If i take text from TextEdit::keyPressEvent(QKeyEvent *e)

QTextCursor tabact = textCursor();
QString actual = tabact.selectedText();

can read is ok but on console newline ("\n") are on unknow char (?) and

QStringList line = actual.split("\n"); can not split . why? only one line result if select 2 or more line...

void TextEdit::IndentText(const  QString text , int x )
{
const QChar Nline('\n');
 
QClipboard  *netag = QApplication::clipboard();
QString textclip = netag->text(QClipboard::Selection); 
 
QStringList line = textclip.split(Nline);
QStringList newline;
     for (int i = 0; i < line.size(); ++i) {   
      QString onel = QString("\t%1").arg(line.at(i));
      newline.append(onel);
     }
 
qDebug() << "### line!!!   "  << line.size();  /* not correct */
const QString reformat = newline.join(Nline);
 
    netag->clear();
    netag->setText(reformat);
    paste();
}
 
void TextEdit::keyPressEvent(QKeyEvent *e)
{
 
     if (e->key() == Qt::Key_Tab) {
 
            QTextCursor tabact = textCursor();
            int stabstart = tabact.selectionStart();
            int stabstop = tabact.selectionEnd();
            const QString actual = tabact.selectedText();
            if (actual.size() > 3) {
                IndentText(actual,1);
                cut();
                qDebug() << "### stabstart   "  << stabstart; 
                qDebug() << "### stabstop   "  << stabstart; 
                return;
            }
      }

void TextEdit::IndentText(const  QString text , int x )
{
const QChar Nline('\n');

QClipboard  *netag = QApplication::clipboard();
QString textclip = netag->text(QClipboard::Selection); 

QStringList line = textclip.split(Nline);
QStringList newline;
     for (int i = 0; i < line.size(); ++i) {   
      QString onel = QString("\t%1").arg(line.at(i));
      newline.append(onel);
     }
   
qDebug() << "### line!!!   "  << line.size();  /* not correct */
const QString reformat = newline.join(Nline);
   
    netag->clear();
    netag->setText(reformat);
    paste();
}

void TextEdit::keyPressEvent(QKeyEvent *e)
{

     if (e->key() == Qt::Key_Tab) {

            QTextCursor tabact = textCursor();
            int stabstart = tabact.selectionStart();
            int stabstop = tabact.selectionEnd();
            const QString actual = tabact.selectedText();
            if (actual.size() > 3) {
                IndentText(actual,1);
                cut();
                qDebug() << "### stabstart   "  << stabstart; 
                qDebug() << "### stabstop   "  << stabstart; 
                return;
            }
      }

To copy to clipboard, switch view to plain text mode 

[Matt Smith]

I am having similar problems, trying to write a routine to turn a block of text, with multiple lines, into a HTML list:

QString listString = EDITOR->textCursor().selectedText();
 
  if( !listString.isEmpty() ) {
    QStringList stringList = listString.split( QChar( QChar::LineSeparator ) );
    for( int a = 0; a < stringList.count(); a++ ) {
      stringList[a].prepend( "<li>" );
      stringList[a].append( "</li>" );
    }
    listString = stringList.join( "\n" );
    listString.prepend( "<ul>" );
    listString.append( "</ul" );
    EDITOR->insertPlainText( listString );
  }

QString listString = EDITOR->textCursor().selectedText();

  if( !listString.isEmpty() ) {
    QStringList stringList = listString.split( QChar( QChar::LineSeparator ) );
    for( int a = 0; a < stringList.count(); a++ ) {
      stringList[a].prepend( "<li>" );
      stringList[a].append( "</li>" );
    }
    listString = stringList.join( "\n" );
    listString.prepend( "<ul>" );
    listString.append( "</ul" );
    EDITOR->insertPlainText( listString );
  }

To copy to clipboard, switch view to plain text mode 

This also didn't work:

QString listString = EDITOR->textCursor().selectedText();
 
  if( !listString.isEmpty() ) {
    listString.prepend( "<ol><li>" );
    listString.replace( QChar( QChar::LineSeparator ),
			QString( "</li>%1<li>" ).arg( QChar( QChar::LineSeparator ) ) );
    listString.append( "</li></ol>" );
    EDITOR->insertPlainText( listString );
  }

QString listString = EDITOR->textCursor().selectedText();

  if( !listString.isEmpty() ) {
    listString.prepend( "<ol><li>" );
    listString.replace( QChar( QChar::LineSeparator ),
			QString( "</li>%1<li>" ).arg( QChar( QChar::LineSeparator ) ) );
    listString.append( "</li></ol>" );
    EDITOR->insertPlainText( listString );
  }

To copy to clipboard, switch view to plain text mode 

It treats the whole block as a single line, so that the list is opened and closed as expected, but contains only one element, i.e. the whole selection. However, the newlines themselves do appear when the listString is inserted back into the QTextEdit.

Does anyone know the cause of this, and if there is any way round it?

[wysota]

This seems to work:

#include <QString>
#include <QStringList>
#include <QApplication>
#include <QTextEdit>
#include <QClipboard>
#include <QTextDocumentFragment>
#include <QMimeData>
 
class TextEdit : public QTextEdit {
  Q_OBJECT
public:
  TextEdit(QWidget *parent=0) : QTextEdit(parent){
    connect(this, SIGNAL(selectionChanged()), SLOT(updateClipboard()));
  }
private slots:
  void updateClipboard(){
    qDebug("CALLED");
    QClipboard *clip = QApplication::clipboard();
    QString text = textCursor().selection().toPlainText();
    QStringList slist = text.split("\n");
    QString result = "<ul>\n";
    foreach(QString elem, slist){
      result+="<li>"+elem.trimmed()+"</li>\n";
    }
    result+="</ul>";
    QMimeData *data = new QMimeData;
    data->setHtml(result);
    data->setText(result);
    clip->setMimeData(data);
  }
};
 
#include "main.moc"
 
int main(int argc, char **argv){
  QApplication app(argc, argv);
  TextEdit t;
  t.show();
  return app.exec();
}

#include <QString>
#include <QStringList>
#include <QApplication>
#include <QTextEdit>
#include <QClipboard>
#include <QTextDocumentFragment>
#include <QMimeData>

class TextEdit : public QTextEdit {
  Q_OBJECT
public:
  TextEdit(QWidget *parent=0) : QTextEdit(parent){
    connect(this, SIGNAL(selectionChanged()), SLOT(updateClipboard()));
  }
private slots:
  void updateClipboard(){
    qDebug("CALLED");
    QClipboard *clip = QApplication::clipboard();
    QString text = textCursor().selection().toPlainText();
    QStringList slist = text.split("\n");
    QString result = "<ul>\n";
    foreach(QString elem, slist){
      result+="<li>"+elem.trimmed()+"</li>\n";
    }
    result+="</ul>";
    QMimeData *data = new QMimeData;
    data->setHtml(result);
    data->setText(result);
    clip->setMimeData(data);
  }
};

#include "main.moc"

int main(int argc, char **argv){
  QApplication app(argc, argv);
  TextEdit t;
  t.show();
  return app.exec();
}

To copy to clipboard, switch view to plain text mode 

Maybe the difference is that I use selection() instead of selectedText().