Formatting a QString

[icentenee]

A QString text should be displayed with differen colors and fonts.
It seems that coloring QString is not possible - like in other classes, e.g. QTextEdit (QTextEdit::setTextColor). How can I convert the QString to another class ?

[jacek]

QString just holds a string, it doesn't have any appearance. Where do you want to display that string?

[icentenee]

It's in a QTextEdit panel.
Currently the text is appended thru "tr(stringtext.toAscii().data())".
But this way there is no formatting possibility.

[jacek]

But this way there is no formatting possibility.
You can add rich text tags after it was translated.

Another possibility is to use QSyntaxHighlighter.

[icentenee]

How can I set a rich tag to a QString ?
"tr(stringtext.toAscii().data())" is a QString, and is put to the QTextEdit panel
with append - may be the attributes can be changed afterwards, when the text
is written out (inside the QTextEdit instance) ?

[jacek]

How can I set a rich tag to a QString ?
Something like this should work:
QString msg( tr(...) );
QString format( "<span style=\"...\">%1</span>" );
...
QString formattedMsg( format.arg( msg ) );


may be the attributes can be changed afterwards, when the text
is written out (inside the QTextEdit instance) ?
You should be able to change them through QTextDocument and QTextFormat.

[icentenee]

this try:
---------
QTextEditor txtEditor;
QString format( "<span style=\"style=color:#FF0000\">%1</span>" );
QString formattedMsg( format.arg(result_all) );
txtEditor.append( formattedMsg.toAscii().data() );

HTML is resolved, but there is no text formatting (coloring).
Seems that the string is simply output as ascii.

[jacek]

"<span style=\"style=color:#FF0000\">%1</span>"
Shouldn't it be: "<span style=\"color:#FF0000\">%1</span>"?

[icentenee]

Sorry, ok now, that was an edit error.
There is another possibility, with the QTextCursor class, I assume, for formatting
text sections.
Do you know about examples ?

[jacek]

include <QApplication>
#include <QPushButton>
#include <QTextCharFormat>
#include <QTextCursor>
#include <QTextEdit>
#include <QVBoxLayout>
#include <QWidget>

class Test : public QWidget
{
Q_OBJECT
public:
Test() : QWidget( 0 )
{
_textEdit = new QTextEdit();
QPushButton *b = new QPushButton( "Format" );
QVBoxLayout *l = new QVBoxLayout();

l->addWidget( _textEdit );
l->addWidget( b );
setLayout( l );

connect( b, SIGNAL( clicked() ), this, SLOT( format() ) );
}

private slots:
void format()
{
QTextCursor cur( _textEdit->document() );

// indent first paragraph
QTextBlockFormat f( cur.blockFormat() ); // note: you get a copy of the format
f.setIndent( 1 );
cur.setBlockFormat( f ); // here you replace the format used in document

// move to next paragraph
if( cur.movePosition( QTextCursor::NextBlock ) ) {

// select first line
cur.movePosition( QTextCursor::StartOfLine );
cur.movePosition( QTextCursor::EndOfLine, QTextCursor::KeepAnchor );
// note that what "line" means depends on the size of text edit --- resize the
// window to see how it behaves

// underline selected line
QTextCharFormat f( cur.charFormat() );
f.setFontUnderline( true );
cur.setCharFormat( f );
}
}

private:
QTextEdit *_textEdit;
};

int main( int argc, char **argv )
{
QApplication app( argc, argv );

Test t;
t.show();

return app.exec();
}

#include "main.moc"