How to set orientation of text in horizontal header ?

andre

Yes, you do know what text to draw, as you have access to the logicalIndex. Reference the implementation of QHeaderView for how drawing is implemented there. The paintSection method in that class -uses- should use the exact same data that you have available in your implementation of paintSection.

Anticross

In Assistant i find only this:
void QHeaderView::paintSection ( QPainter * painter, const QRect & rect, int logicalIndex ) const [virtual protected]

Paints the section specified by the given logicalIndex, using the given painter and rect.

Normally, you do not have to call this function.

andre

I mean: open up the source code of QHeaderView to take a peek on how this works in Qt, and use that solution as inspiration on how your own implementation may work. Since we're all developers here, I assume you're not afraid to read source code?

Anticross

Thanks, Andre, I will look at it.

Anticross

I modified my paintSection function like this:
@if(m_orientation == Qt::Horizontal)
{
//////////////////////////////////////////////////////////////////////////
if (!rect.isValid())
return;
// get the state of the section
QStyleOptionHeader opt;
initStyleOption(&opt);
QStyle::State state = QStyle::State_None;
if (isEnabled())
state |= QStyle::State_Enabled;
if (window()->isActiveWindow())
state |= QStyle::State_Active;

  if (isSortIndicatorShown() && sortIndicatorSection() == logicalIndex)
   opt.sortIndicator = (sortIndicatorOrder() == Qt::AscendingOrder)
   ? QStyleOptionHeader::SortDown : QStyleOptionHeader::SortUp;

  // setup the style options structure
  opt.rect = rect;
  opt.section = logicalIndex;
  opt.state |= state;

  opt.iconAlignment = Qt::AlignVCenter;

  opt.text = model()->headerData(logicalIndex, m_orientation,
   Qt::DisplayRole).toString();

  QPointF oldBO = painter->brushOrigin();


  // the section position
  int visual = visualIndex(logicalIndex);
  Q_ASSERT(visual != -1);
  if (count() == 1)
   opt.position = QStyleOptionHeader::OnlyOneSection;
  else if (visual == 0)
   opt.position = QStyleOptionHeader::Beginning;
  else if (visual == count() - 1)
   opt.position = QStyleOptionHeader::End;
  else
   opt.position = QStyleOptionHeader::Middle;

  // the selected position

  // draw the section
  painter->rotate(90); // Actually the rotation
  style()->drawControl(QStyle::CE_Header, &opt, painter, this);

  painter->setBrushOrigin(oldBO);
  //////////////////////////////////////////////////////////////////////////
 }
 else
  QHeaderView::paintSection (painter,rect,logicalIndex );@

And now I need to resize header to it's contents. So how can I resize header to max length string size ? And it's rotates all my header not each item by 90 degree.

Anticross

I find solution to draw text by searching a forum:
@painter->save();
painter->translate(rect.x(), rect.y());
painter->rotate(90); // or 270
painter->drawText(0, 0, model()->headerData(logicalIndex, m_orientation,Qt::DisplayRole).toString());
painter->restore();@
"Link":http://developer.qt.nokia.com/faq/answer/how_can_i_draw_vertical_text
But if I draw text by this method I lost my header control and get only text. I mean no system styled header and just text on flat panel. And I still need to resize header by it's content.

andre

I would modify your previous version of the code (from the post from yesterday) around line 47. What I would do, is first draw a section without text, by modifying the opt variable:

@
//replacing lines 47 - 50

//store the header text
QString headerText = opt.text;
//reset the header text to no text
opt.text = QString();
//draw the control (unrotated!)
style()->drawControl(QStyle::CE_Header, &opt, painter, this);

painter.save();
painter->translate(rect.x(), rect.y());
painter->rotate(90); // or 270
painter->drawText(0, 0, headerText);
painter->restore();
@

That should take care of the actual drawing.

As for the re-sizing, I think you need to reimplement sizeHint() to return the right size.

Anticross

I write the following code and I have no result. I have a header without any text at all. I think that save and restore functions for painter has no effect after calling drawControl function. So I thinking about some modifications to draw with QStyle::CE_HeaderSection but can't find any typical examples or any other ideas. I tried to draw replacing QStyle::CE_Header by QStyle::CE_HeaderSection and also have no text in header.

Anticross

How can I get the painter for each item of my header to rotate it ? This must be the way to solve this task. I also tried to use custom style with same code, but also has no result. ("Style examle":http://developer.qt.nokia.com/faq/answer/how_can_i_display_vertical_text_in_the_section_of_a_qheaderview) It will be useful to have such function for QHeaderView like setVerticalText(bool). Maybe it possible to realize it in next Qt release.

Anticross

I found some way to solve this in table widget which I use:
@QHeaderView * header = m_ui->tableWidget->horizontalHeader();

int columnCnt = m_ui->tableWidget->columnCount();
int width = header->width()/columnCnt;
int height = header->height();

for(int i = 0; i<columnCnt; i++)
{
QTableWidgetItem * item = m_ui->tableWidget->horizontalHeaderItem(i);

if(item == NULL)
continue;

QVariant data = item->data(Qt::DisplayRole);

if (data.isValid())
{
QString text=data.toString();
item->setData(Qt::DisplayRole, "");
QPixmap original_button(width, height);
QPainter original_button_painter(&original_button);
/* QHeaderView::paintSection(&original_button_painter, QRect(0, 0, width, height), i);*/

QPixmap pix(width, height);
QPainter p(&pix);
p.drawPixmap(0, 0, original_button);

QRect new_r(0, 0, height, width);
QMatrix m;
m.translate(0, height);
m.rotate(-90);
p.setWorldMatrix(m, true);
p.drawText(new_r, Qt::AlignCenter, text);

item->setIcon(pix);
item->setSizeHint(QSize( height, width ));
}
}@
This code I place on my dialog which holds table widget in ui file. So the only one question is how to set true sizes of the text? It looks smaller then text in vertical header. Waiting for your code critic and propositions.