How to draw vertical text via QTextEdit

[nifei]

hi, i need to draw text in both vertical layout and horizontal layout. like

[aamer4yu]

If your drawing yourself, you can rotate the painter , easiest way i guess

[nifei]

If your drawing yourself, you can rotate the painter , easiest way i guess

I want to draw the text from top to bottom on QTextDocument and call QTextCocument : : drawContents(QPainter *).

BTW, what is the relationship between QTextDocument, QTextEdit, QTextFormat and QTextTable/ QTextList , .etc? I'm new to these classes.

[jryannel]

As the previous poster said, use rotate the painter. Look in the analog clock example for how todo this.

In Qt instead of rotating/scaling (e.g. transforming) objects, we transform the painter. It's much easier like this as soon as you get used to;-)

This might also help you:
- http://doc.trolltech.com/qq/qq24-textlayouts.html

- Juergen

[nifei]

As the previous poster said, use rotate the painter. Look in the analog clock example for how todo this.

In Qt instead of rotating/scaling (e.g. transforming) objects, we transform the painter. It's much easier like this as soon as you get used to;-)

This might also help you:
- http://doc.trolltech.com/qq/qq24-textlayouts.html

- Juergen

Thanks for your suggestion and the linked article, that is a little complicated for my project. May be rotate QPainter is the only way to draw vertical text. I supposed to edit the whole text via QTextDocument and render them to QPainter, if rotating/translating the QPainter, all the text will be rotated or translated.

i think i have to draw the contents of QTextDocument twice, once drawing horizontal text, then rotating the QPainter and drawing the vertical text. is that right?

[wagmare]

Thanks for your suggestion and the linked article, that is a little complicated for my project. May be rotate QPainter is the only way to draw vertical text. I supposed to edit the whole text via QTextDocument and render them to QPainter, if rotating/translating the QPainter, all the text will be rotated or translated.

i think i have to draw the contents of QTextDocument twice, once drawing horizontal text, then rotating the QPainter and drawing the vertical text. is that right?

it is a little suggestion ... libqxt-0.4 is having the property to rotate your widget . especially pushButton , lineEdit ... etc ... in the designer level itself ..
get the source and add it to your qt library ..

[nifei]

it is a little suggestion ... libqxt-0.4 is having the property to rotate your widget . especially pushButton , lineEdit ... etc ... in the designer level itself ..
get the source and add it to your qt library ..

l don't think we can use libqxt-0.4 library...for me the key problem is not how to draw vertical text now, but how to draw both vertical and horizontal text in one time. i hope this is feasible.

[nifei]

I traced through QTextDocument : : drawContents (QPainter*) in hopes of QTextFormat's properties being used to control the painter, as i found QTextFormat : : setProperty ( int, QVariant) and guessed we could set QTextFormat : : UserProperty as vertical or horizontal then use this property when using the painter. however, i got lost.

My ideas is to re-implement QTextDocument : : drawContents (QPainter * ) or other functions to get the QTextFormat's properties that have been set by users, According to the UserProperty rotate the painter or not. is this a bad idea?

CustomTextDocument::someFunction(QPainter *painter, QTextFormat *format)
// format might be sub class of QTextFormat, for example, QBlockTextFormat
{
    if (format.property(QTextFormat::UserProperty).toInt() == CustomTextDocument::Vertical)
           {
               painter->save();
               painter->translate( xoff, yoff);// to correct the text's position
               painter->rotate(90);
               QTextDocument::someFunctioin(painter, format);
               // call the basic class's function to draw the text, however rotated.
               painter->restore();
           }
     else
               QTextDocument::someFunction(painter, format);
              // if no vertical text is needed, call basic class's function
}

CustomTextDocument::someFunction(QPainter *painter, QTextFormat *format)
// format might be sub class of QTextFormat, for example, QBlockTextFormat
{
    if (format.property(QTextFormat::UserProperty).toInt() == CustomTextDocument::Vertical)
           {
               painter->save();
               painter->translate( xoff, yoff);// to correct the text's position
               painter->rotate(90);
               QTextDocument::someFunctioin(painter, format);
               // call the basic class's function to draw the text, however rotated.
               painter->restore();
           }
     else
               QTextDocument::someFunction(painter, format);
              // if no vertical text is needed, call basic class's function
}

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[steno]

So I have this code snippet to draw vertical text in a QTextEdit. However, I have 2 problems with this code. The cursor doesn't update when moved, the cursor doesn't blink, and when text is selected it doesn't draw the selection. Any ideas?

void TextEdit::paintEvent(QPaintEvent *e)
{
    QPainter painter(viewport());
 
    painter.rotate(-90);
    painter.translate(-viewport()->rect().height(),0);
 
    QAbstractTextDocumentLayout::Selection selection;
    selection.cursor = textCursor();
    selection.format = textCursor().charFormat();
 
    QAbstractTextDocumentLayout::PaintContext ctx;
    ctx.cursorPosition = textCursor().position();
    ctx.selections.append(selection);
 
    document()->documentLayout()->draw(&painter,ctx);
}

void TextEdit::paintEvent(QPaintEvent *e)
{
    QPainter painter(viewport());

    painter.rotate(-90);
    painter.translate(-viewport()->rect().height(),0);

    QAbstractTextDocumentLayout::Selection selection;
    selection.cursor = textCursor();
    selection.format = textCursor().charFormat();

    QAbstractTextDocumentLayout::PaintContext ctx;
    ctx.cursorPosition = textCursor().position();
    ctx.selections.append(selection);

    document()->documentLayout()->draw(&painter,ctx);
}

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