I need to iterate through the QTreeview list with buttons the way it natively does via the keyboard arrow keys. I can get it to jump to the last item with this code, but it won't iterate through the list, it just jumps to the last item.
for( int i = 0; i < ui->TList_Tree->topLevelItemCount(); ++i )
{
ui->TList_Tree->setCurrentIndex(ui->TList_Tree->currentIndex().sibling(i,0));
}
I'm sure I'm missing something simple here.
My comments above missed the rather obvious QTreeView::indexAbove and QTreeView::indexBelow. So your button that that moves the cursor down should connect to code that does something along the lines of...
QModelIndex index = ui->TList_Tree->indexBelow(ui->TList_Tree->currentIndex());
if (index.isValid())
ui->TList_Tree->setCurrentIndex(index);
Did a quick check and this appears to do what you want.
Related
I'm trying to get PgDown clicks on a QTableView to scroll down a variable number of rows. I talk to my subclassed QSortFilterProxyModel which talks to the subclassed QAbstractTableModel to figure out what the next row is. That's all fine and dandy but I believe I'm faced with two caveats:
1: The row number inside the view doesn't do much. I need a QPoint on the screen to scroll to, and I'm not sure how to derive that from a cell.
2: I can create an index in the QSortFilterProxyModel but this generally causes crashes, as the parent is different... or I'm missing something.
int nextRow = getModel()->nextRow( indexAt( rect().topLeft() ) );
QModelIndex nextIndex = getModel()->index( nextRow, 0 );
scrollTo( nextIndex, QAbstractItemView::PositionAtTop );
Okay, I figured this out:
QModelIndex nextIndex = getModel()->index( nextRow, 0 );
scrollTo( nextIndex, QAbstractItemView::PositionAtTop );
I was having the QSortFilterProxyModel create and index which was a big no-no. I have issues when I have hidden rows, but should hopefully be able to figure that out.
I am loading .ui files via QUiloader, and showing the GUI in my application.
QWidget *mywidget = loader.load(file, this);
QList<QWidget*> wlist = mywidget.findChildren<QWidget *>()
I would like to know what is the text on QPushbutton. I know there is a method text() to get a text from Pushbutton, but it is not accessible when I do:
QString btext = wlist.at(1).text();
Any idea how I can get the text from QPushbutton, and other Widgets, when they grouped as QWidget?
Thanks.
You should search for QPushButtons instead of QWidgets:
QList<QPushButton*> blist = widget.findChildren<QPushButton*>();
Still your code wouldn't compile. The last line should read:
QString btext = blist.at(1)->text();
Using -> since you are accessing a pointer, not the widget. Also you should check if the findChildren() function actually returnes enough buttons. You would get a crash or assertions when accessing a list item by an invalid index.
Also please note that at(1) does not return the first but the second item in the list (lists start from 0).
Update: If you search for QWidgets and cast each of them you need to take care of getting a nullptr:
QList<QWidget*> wlist = widget.findChildren<QWidget*>();
foreach (QWidget* w, wlist)
{
QPushButton* b = dynamic_cast<QPushButton*>(w);
// If "w" is not a button "b" is nullptr
if (b)
{
QString btext = b->text();
}
}
I have a QDomDocument called doc and I need to make a QStringList of each of its top-level children. So far I have this:
QDomNodeList nodes = doc.childNodes();
for(int i = 0; i < nodes.size(); i++)
{
QDomText text = nodes.at(i).toText();
//do something here...
}
However, I cannot find any way to convert this to a QString. This is my first time ever working with The QDom* classes, so I'm pretty confused, and going by the docs there doesn't seem like much can be done with QDomText. Can anyone please offer some advice? Thanks in advance!
The parent QDomElement has a method QDomElement::text() returning the contents of the text node. Operating on the QDomElement level and using text() should be the most simple and standard way to get the element text.
Alternatively, you can call QDomCharacterData::data() (QDomCharacterData is a baseclass of QDomText) in cases where you go down to the QDomText node level.
This a very simple problem to which I can find no solution:
This is my code:
qint32 pos = ui->twShow->verticalScrollBar()->value();
ui->twShow->blockSignals(true);
//Code for updating the contents QTableWidget twShow, this is done by erasing all cells and adding them again, in case it matters.
ui->twShow->blockSignals(false);
if (pos > 0){
ui->twShow->verticalScrollBar()->setValue(pos);
}
What I want to accomplish is simply to maintain the vertical scroll position. However the setValue function ignores the value pos (I've checked by printing the value before and after the instruction and both times its cero).
I have also tried:
QScrollBar *bar = ui->twShow->verticalScrollBar();
// Same code as before
ui->twShow->setVerticalScrollBar(bar); //This line crashes de program
However the last line crashes the program (which I've checked by commenting it, and it works fine).
Any advice would be greatly appreciated...
Thank you very much
QTableWidget * tw;
int desiredRow;
// before update
desiredRow = tw->row(tw->itemAt(1,1));
...
// update code
...
tw->scrollToItem( tw->item( desiredRow, 0),
QAbstractItemView::EnsureVisible | QAbstractItemView::PositionAtTop );
QAbstractItemView::EnsureVisible = 0.
The 'or' flag converts the result to an integer which is not allowed as parameter of the scrollToItem method. On the other hand enums are not intended to be used as combined flags.
i want to set my font as bold in particular row column position of my tablewidget.
I did like this but getting break.
QFont font("Helvetica", 12, QFont::Bold);
overviewTable->item(2,2)->setFont(font);
Please Help
I think everything is ok. Here what docs said:
void QTableWidgetItem::setFont ( const QFont & font )
Sets the font used to display the item's text to the given font.
Maybe your overviewTable const?
ADDED:
This variant works fine for my Qt 4.6:
tableWidget = new QTableWidget(12, 3, this);
for (int i = 0; i < 12; i++) {
for (int j = 0; j < 3; j++) {
QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
(i+1)*(j+1)));
tableWidget->setItem(i, j, newItem);
}
}
QFont font;
font.setBold(true);
tableWidget->item(2, 2)->setFont(font);
Maybe you are getting break because you didn't call setItem() to set an item for the cell (2, 2) before you use overviewTable->item(2,2). As the Qt document says,
QTableWidgetItem * QTableWidget::item(int row, int column) const
Returns the item for the given row and column if one has been set;
otherwise returns 0.
That is, your overviewTable->item(2,2) probably returns 0, thus causes a Segmentation fault in the setFont() call.
So your means to setting font is completely right. You just need to call setItem() at first as mosg's answer suggests.
ADDED:
if your overviewTable is a QTableWidget created in Qt Designer, then in the Designer a double-click on a cell (just to enter its editing mode, no need to actually enter anything) will have the effect of calling setItem() for that cell. Later in your code you can directly using the item() function without having to call setItem() first.