line spaceing in QTextDocument

Following my previous post, i`d need custom line spacing in a QTextDocument.

No proper solution was found here:
http://www.qtcentre.org/threads/1929...t-line-spacing

But after the post, an addition was supposedly made to Qt in 4.8.0:
https://bugreports.qt-project.org/browse/QTBUG-14470

Quote:

---

Status: Closed Closed
Priority: P2: Important P2: Important
Resolution: Done
Affects Version/s: 4.7.0
Fix Version/s: 4.8.0

---

However, the thread fails to mention what exactly was added/changed, and i am unable to find anything in Qt 4.8.1. :/

I figured i am supposed to layout every single paragraph in the document by subclassing this:
http://doc.qt.nokia.com/4.7-snapshot...entlayout.html

but i still wouldnt know how to change the line space...


Funny, Qt offers so much awesomeness, and then it`s these little things that you are left spending time on...:eek:

Hi,

you can iterate through the blocks of QTextDocument and set the line spacing with QTextBlock::blockFormat() + QTextBlockFormat::setLineHeight().

thanks!

It wont work though...
I decided to go bruteforce onthis:

Code:

---

testform::testform(QWidget *parent, Qt::WFlags flags)
	: QMainWindow(parent, flags)
{
	ui.setupUi(this);
 
 
	ui.textEdit->setText("asdfasdfasdf\r\nbbbbbbbbbbbbbbbbbbbb\r\nccccccccccccccccc\r\nddddddddddddddddddf");
 
	for(int i=0; i<ui.textEdit->document()->blockCount(); i++)
	{
		ui.textEdit->document()->findBlockByNumber(i).blockFormat().setLineHeight(12, QTextBlockFormat::LineDistanceHeight);
	}
}

---

But it doesnt work. :(

Of course it does not work. You have to set the modified format back to the document! blockFormat() simply returns a copy of the format, no pointer nor reference!

Code:

---

QTextEdit te;
    te.setText("asdfasdfasdf\nbbbbbbbbbbbbbbbbbbbb\nccccccccccccccccc\nddddddddddddddddddf");
    QTextCursor c(te.document());
    c.movePosition(QTextCursor::Start);
    do {
        QTextBlockFormat f = c.blockFormat();
        f.setLineHeight(12, QTextBlockFormat::LineDistanceHeight);
        c.setBlockFormat(f);
    } while (c.movePosition(QTextCursor::NextBlock));
    te.show();

---

ouch...yeah, that was it. That makes a great second post, doesnt it...:(

So now i have this code to render a document to the screen:

Code:

---

painter->translate(x, y);
		document()->setTextWidth(w);
		document()->setDefaultFont(painter->font());
 
 
		QTextCursor c(document());
		c.movePosition(QTextCursor::Start);
		do {
			QTextBlockFormat f = c.blockFormat();
			f.setLineHeight(h, QTextBlockFormat::LineDistanceHeight);
			c.setBlockFormat(f);
		} while (c.movePosition(QTextCursor::NextBlock));
 
 
		document()->drawContents(painter, QRect(0,0,w,h));

---

This works perfectly for single-line strings, but not when strings with linebreaks in it have been assigned:

Code:

---

document().setPlainText("aaaaa\nbbbbbbb\ncccccc");

---

any idea?:)

Quote:

---

Originally Posted by tuli

any idea?:)

---

Yes. The second parameter of drawContents clips the painting. So you have to alter "h" when you have more lines than one or just leave it empty.

h provide sufficient space, and

Quote:

---

document()->drawContents(painter);

---

provides same result... :/

Then please make a minimal compile able example which illustrate your problem.