Word wrap in QListView

[jiveaxe]

Well, I have some new and some code to post.

Following marcel's suggestion I have modified the stardelegate example removing the editor and related parts. I have changed the parameter passed to StarRating (from int, the rating, to QString, the text to wordwrap) and used the code from this post; in this way the tableWidget contains a rich text column and long text is wrapped but it overlaps rows below: the cell height is not updated to enclose the multi-line text (hoping i was clear!).

Then i have made a new copy of the source code and substituted QTableWidget with QListWidget; after some editing i have obtained a working application but without wordwrap (it used a horizontal scrollbar if text is too long).

My questions are:
1) how disable scrollbar in qlistwidget and fix the width forcing word wrap?
2) how change row height according wordwrapping?

The application, like Star Delegate example, has 2 classes:
- TextDelegate.
- TextPainter.

Here the code (sorry for the long post):

textdelegate.h

#ifndef TEXTDELEGATE_H
#define TEXTDELEGATE_H
 
#include <QItemDelegate>
 
class TextDelegate : public QItemDelegate
{
	Q_OBJECT
 
	public:
		TextDelegate(QWidget *parent = 0) : QItemDelegate(parent) {}
 
		void paint(QPainter *painter, const QStyleOptionViewItem &option,
				   const QModelIndex &index) const;
		QSize sizeHint(const QStyleOptionViewItem &option,
					   const QModelIndex &index) const;
};
 
#endif

#ifndef TEXTDELEGATE_H
#define TEXTDELEGATE_H

#include <QItemDelegate>

class TextDelegate : public QItemDelegate
{
	Q_OBJECT

	public:
		TextDelegate(QWidget *parent = 0) : QItemDelegate(parent) {}

		void paint(QPainter *painter, const QStyleOptionViewItem &option,
				   const QModelIndex &index) const;
		QSize sizeHint(const QStyleOptionViewItem &option,
					   const QModelIndex &index) const;
};

#endif

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textdelegate.cpp

#include <QtGui>
 
#include "textdelegate.h"
#include "textpainter.h"
 
void TextDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
						 const QModelIndex &index) const
{
	if (qVariantCanConvert<TextPainter>(index.data())) {
		TextPainter textPainter = qVariantValue<TextPainter>(index.data());
 
		if (option.state & QStyle::State_Selected)
			painter->fillRect(option.rect, option.palette.highlight());
 
		textPainter.paint(painter, option, TextPainter::ReadOnly);
	} else {
		QItemDelegate::paint(painter, option, index);
	}
}
 
QSize TextDelegate::sizeHint(const QStyleOptionViewItem &option,
							 const QModelIndex &index) const
{
	if (qVariantCanConvert<TextPainter>(index.data())) {
		TextPainter textPainter = qVariantValue<TextPainter>(index.data());
		return textPainter.sizeHint();
	} else {
		return QItemDelegate::sizeHint(option, index);
	}
}

#include <QtGui>

#include "textdelegate.h"
#include "textpainter.h"

void TextDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option,
						 const QModelIndex &index) const
{
	if (qVariantCanConvert<TextPainter>(index.data())) {
		TextPainter textPainter = qVariantValue<TextPainter>(index.data());

		if (option.state & QStyle::State_Selected)
			painter->fillRect(option.rect, option.palette.highlight());

		textPainter.paint(painter, option, TextPainter::ReadOnly);
	} else {
		QItemDelegate::paint(painter, option, index);
	}
}

QSize TextDelegate::sizeHint(const QStyleOptionViewItem &option,
							 const QModelIndex &index) const
{
	if (qVariantCanConvert<TextPainter>(index.data())) {
		TextPainter textPainter = qVariantValue<TextPainter>(index.data());
		return textPainter.sizeHint();
	} else {
		return QItemDelegate::sizeHint(option, index);
	}
}

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textpainter.h

#ifndef TEXTPAINTER_H
#define TEXTPAINTER_H
 
#include <QMetaType>
#include <QString>
 
class TextPainter
{
	public:
		enum EditMode { Editable, ReadOnly };
 
		TextPainter(QString text = "");
 
		void paint(QPainter *painter, const QStyleOptionViewItem &option, EditMode mode) const;
		QSize sizeHint() const;
 
	private:
 
		QString itemText;
};
 
Q_DECLARE_METATYPE(TextPainter)
 
#endif

#ifndef TEXTPAINTER_H
#define TEXTPAINTER_H

#include <QMetaType>
#include <QString>

class TextPainter
{
	public:
		enum EditMode { Editable, ReadOnly };

		TextPainter(QString text = "");

		void paint(QPainter *painter, const QStyleOptionViewItem &option, EditMode mode) const;
		QSize sizeHint() const;

	private:

		QString itemText;
};

Q_DECLARE_METATYPE(TextPainter)

#endif

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textpainter.cpp

#include <QtGui>
 
#include "textpainter.h"
 
const int PaintingScaleFactor = 20;
 
TextPainter::TextPainter(QString text)
{
	itemText = text;
}
 
QSize TextPainter::sizeHint() const
{
	return PaintingScaleFactor * QSize(itemText.length()/2-2, 1);
}
 
void TextPainter::paint(QPainter *painter, const QStyleOptionViewItem &option, EditMode mode) const
{
	if (mode == Editable) {
		painter->setBrush(option.palette.highlight());
	} else {
		painter->setBrush(option.palette.foreground());
	}
 
 
	painter->save();
	QTextDocument doc;
	doc.setHtml(itemText);
	QAbstractTextDocumentLayout::PaintContext context;
	doc.setPageSize( option.rect.size());
	painter->translate(option.rect.x(), option.rect.y()-20);
	doc.documentLayout()->draw(painter, context);
	painter->restore();
}

#include <QtGui>

#include "textpainter.h"

const int PaintingScaleFactor = 20;

TextPainter::TextPainter(QString text)
{
	itemText = text;
}

QSize TextPainter::sizeHint() const
{
	return PaintingScaleFactor * QSize(itemText.length()/2-2, 1);
}

void TextPainter::paint(QPainter *painter, const QStyleOptionViewItem &option, EditMode mode) const
{
	if (mode == Editable) {
		painter->setBrush(option.palette.highlight());
	} else {
		painter->setBrush(option.palette.foreground());
	}


	painter->save();
	QTextDocument doc;
	doc.setHtml(itemText);
	QAbstractTextDocumentLayout::PaintContext context;
	doc.setPageSize( option.rect.size());
	painter->translate(option.rect.x(), option.rect.y()-20);
	doc.documentLayout()->draw(painter, context);
	painter->restore();
}

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