Highlight or color a word of string in tableview

AmrCoder

I have a table view in wich I want to highlight or color a word in it I use this code to make the table view

    QStandardItemModel *model = new QStandardItemModel();
    model->setHorizontalHeaderItem(0,new QStandardItem(QString("Name")));
    model->setHorizontalHeaderItem(1,new QStandardItem(QString("Email")));
    QFile file("a.txt"); // contains 7000 name / email , email lenght between 100 500 char
    file.open(QIODevice::ReadOnly | QIODevice::Text);
    QTextStream s(&file);
    while (!s.atEnd()) {
        QString name = s.readLine();
        QString e = s.readLine();
        if (e.contains("good")) {
            // here how to highelight this word !!!!!!!!!!!!!!!!
            // i try this
            int start = e.indexOf("good");
            int end = start + QString("good").size();
            e = e.insert(start,"<font color = \"red\">");
            e = e.insert(end,"</font>");
        }
    }
    ui->tableView->setModel(model);

I try also to add a PlainttextEdit in the column and use QTextCursor + QTextCharFormat to highlight the word
but it take a very very long time reach to 15 minute to show the table and it crashes I want to solve this by anyway to highlight or color the word prefered to highlight
is there any way to to this in qt
Thanks in advance

p3c0

@AmrCoder Did you try setForeground for QStandardItem?

VRonin

The default delegate does not support rich text, you have to implement a custom delegate.

Chapter 5 of "Advanced Qt Programming Creating Great Software with C++ and Qt 4" has a rich text delegate implementation (source code downloadable directly from here) but, imho it's not a great implementation

AmrCoder

ok thanks for your reply it helps me but I have a small problem when I search I got this code to set the delegate to my table view and use HTML code to color what I want from words inside the table I use this code

class HTMLDelegate : public QStyledItemDelegate
{
protected:
  void paint ( QPainter * painter, const QStyleOptionViewItem & option, const QModelIndex & index ) const;
  QSize sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const;
};

void HTMLDelegate::paint(QPainter* painter, const QStyleOptionViewItem & option, const QModelIndex &index) const
{
  QStyleOptionViewItemV4 options = option;
  initStyleOption(&options, index);

  painter->save();

  QTextDocument doc;
  doc.setHtml(options.text);

  options.text = "";
  options.widget->style()->drawControl(QStyle::CE_ItemViewItem, &options, painter);

  painter->translate(options.rect.left(), options.rect.top());
  QRect clip(0, 0, options.rect.width(), options.rect.height());
  doc.drawContents(painter, clip);

  painter->restore();
}

QSize HTMLDelegate::sizeHint ( const QStyleOptionViewItem & option, const QModelIndex & index ) const
{
  QStyleOptionViewItemV4 options = option;
  initStyleOption(&options, index);

  QTextDocument doc;
  doc.setHtml(options.text);
  doc.setTextWidth(options.rect.width());
  return QSize(doc.idealWidth(), doc.size().height());
}

but after i use this code i use this 2 properties for my tableview

ui->tableView->horizontalHeader()->setSectionResizeMode( QHeaderView::Stretch);
ui->tableView->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);

so the horizontal stracth so when i resize the tableview it stratched and resize the verticle to content each item with it's content maybe too long maybe short so it appeare like this
alt text
when i use the HTMLDelegate class and set it to my tableview like this

del = new HTMLDelegate();
ui->tableView->setItemDelegate(del);

it appeare like the this
alt text
so what edit i should do to make it have the same properties to use html to color the words and in the same time look like the first one

VRonin

add doc.setTextWidth(options.rect.width()); to paint()

AmrCoder

@VRonin Thank you working great