I'm using a QTableWidget for a simple table. Now each cell should contain two numbers, but I don't want them to be left to right, but for readability on top of each other. I'm using Qt 5.8.
Hence, I tried something like this:
QTableWidget* table=new QTableWidget;
auto item = new QTableWidgetItem(QString("%1\n%2").arg(1).arg(2));
table->setItem(0, 0, item);
Interestingly, the outcome was that the newline \n was completely ignored. I obtain a cell containing 12. Replacing \n by <br> didn't helped.
Any idea, what I'm doing wrong/missing?
This should work, just try to resize the height of your row to give the item enough space.
Related
I'm making a sort of an Excel-type application in which I can load a tab-delimited text file and I am able to edit cells... etc
It's useable but I have an issue related to me allowing the user to "freeze" a number of columns/rows. ("Frozen" rows/columns can only be one of the first ones and are then "frozen", i.e. always displayed even when scrolling)
The whole frozen Col/Row is working but I would like the user to be able to scroll slightly past the last Col/Row in order to be able to only ever display full cells.
Right now when reaching the end of the scrollbar I end up with a partial leftmost column and topmost row because it's only displaying up to the last full col/row and not going a wee bit further for all content to be displayed fully.
I've tried doing adding some space to the maximum scrollbar value once everything is loaded in the table but it seems to have no effect :
table->horizontalScrollBar()->setMaximum(table->horizontalScrollBar()->maximum() + t->horizontalScrollBar()->singleStep()*2);
I tried multiple values too.
(Edit) There may be some Qt code that "snaps" the QTableView viewport back to the edge of the last cell automatically...
(Edit2) I connected verticalScrollbar's rangeChanged() signal to a custom slot with the following code:
void MyTableView::onRangeChanged(int min, int max) {
QScrollBar *sender = verticalScrollBar();
int newVMax = max + 20;
sender->blockSignals(true);
sender->setRange(min, newVMax);
sender->blockSignals(false);
}
Sadly there is definitely a snapback mechanic when scrolling to the end of verticalScrollbar...
Gif of snap back issue
(Edit3) The snap back may be related to:
void QHeaderViewPrivate::setScrollOffset(const QScrollBar *scrollBar, QAbstractItemView::ScrollMode scrollMode)
{
Q_Q(QHeaderView);
if (scrollMode == QAbstractItemView::ScrollPerItem) {
if (scrollBar->maximum() > 0 && scrollBar->value() == scrollBar->maximum())
q->setOffsetToLastSection();
else
q->setOffsetToSectionPosition(scrollBar->value());
} else {
q->setOffset(scrollBar->value());
}
}
mainly:
if (scrollBar->maximum() > 0 && scrollBar->value() == scrollBar->maximum())
q->setOffsetToLastSection();
I have a column in my table which looks like below.
ResourceIdentifier
------------------
arn:aws:ec2:us-east-1:7XXXXXX1:instance/i-09TYTYTY79716
arn:aws:glue:us-east-1:5XXXXXX85:devEndpoint/etl-endpoint
i-075656565f7fea3
i-02c3434343f22
qa-271111145-us-east-1-raw
prod-95756565631-us-east-1-raw
prod-957454551631-us-east-1-isin-repository
i-02XXXXXXf0
I want a new column called 'Trimmed Resource Identifier' which looks at ResourceIdentifier and if the value starts with "arn", then returns value after last "/", else returns the whole string.
For eg.
arn:aws:ec2:us-east-1:7XXXXXX1:instance/i-09TYTYTY79716 ---> i-09TYTYTY797168
i-02XXXXXXf0 --> i-02XXXXXXf0
How do I do this ? I tried creating a new column called "first 3 letters" by extracting first 3 letters of the ResourceIdentifier column but I am getting stuck at the step of adding conditional column. Please see the image below.
Is there a way I can do all of this in one step using DAX instead of creating a new intermediate column ?
Many Thanks
The GUI is too simple to do exactly what you want but go ahead and use it to create the next step, which we can then modify to work properly.
Filling out the GUI like this
will produce a line of code that looks like this (turn on the Formula Bar under the View tab in the query editor if you don't see this formula).
= Table.AddColumn(#"Name of Previous Step Here", "Custom",
each if Text.StartsWith([ResourceIdentifier], "arn") then "output" else [ResourceIdentifier])
The first three letters bit is already handled with the operator I chose, so all that remains is to change the "output" placeholder to what we actually want. There's a handy Text.AfterDelimiter function we can use for this.
Text.AfterDelimiter([ResourceIdentifier], "/", {0, RelativePosition.FromEnd})
This tells it to take the text after the first / (starting from the end). Replace "output" with this expression and you should be good to go.
The problem im getting is if type something in my entry box it first fills index 1 and 2 of the listbox before finally typing into the 3rd index.
def country_get(event):
listbox.delete(3)
listbox.insert(3, country_label.cget('text') + event.widget.get() + '\n')
title_text=StringVar()
entry_country=Entry(master, bg="wheat3", fg="dark slate gray", textvariable=title_text)
entry_country.bind('<KeyRelease>', country_get)
entry_country.grid(row=4, column=1)
I want to be able to type at any index of the listbox whether it be the 3rd or 5th, without having anything at the previous index's.
You can't do what you want. The listbox isn't designed to have empty rows. If you want empty rows, you will need to insert empty strings.
Depending on how many entries I'm using or need, i just insert empty strings like so:
listbox.insert(0, "")
listbox.insert(1, "")
listbox.insert(2, "")
listbox.insert(3, "")
listbox.insert(4, "")
It appears that the listbox is empty when it fact it is just filled with empty strings. There are most likely other ways to get around this, but for what I need my program to do, this is what worked for me.
How can I create a QTableView multiline cell?
I'm filling the table using the code bellow.
But Whem GetDescription() returns a long string, the content is terminated with ...
There is some way to automatic break the line?
QStandardItemModel * model = new QStandardItemModel(logos.size(), 2, this);
model->setHorizontalHeaderItem(0, new QStandardItem(QString("")));
model->setHorizontalHeaderItem(1, new QStandardItem(QString("Nome")));
model->setHorizontalHeaderItem(2, new QStandardItem(QString("Descrição")));
int row = 0;
foreach(Item * item, items)
{
QStandardItem* check = new QStandardItem(true);
check->setCheckable(true);
model->setItem(row, 0, check);
QStandardItem *nameItem = new QStandardItem(QString(item->GetName()));
nameItem->setEditable(false);
model->setItem(row, 1, nameItem);
QStandardItem *descriptionItem = new QStandardItem(item->GetDescription());
descriptionItem->setEditable(false);
descriptionItem->setToolTip(logo->GetDescription());
model->setItem(row, 2, descriptionItem);
row++;
}
ui->tableView->setModel(model);
ui->tableView->resizeColumnToContents(0);
ui->tableView->resizeColumnToContents(1);
ui->tableView->horizontalHeader()->setSectionResizeMode(0, QHeaderView::Fixed);
ui->tableView->horizontalHeader()->setSectionResizeMode(1, QHeaderView::Fixed);
ui->tableView->horizontalHeader()->setSectionResizeMode(2, QHeaderView::Stretch);
ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
I think word wrapping is what you're looking for. Make sure that you've enabled wordwrap for the QTableView, then manually resize the rows to fit their contents. That will replace the ellipse with the text.
As you mentioned in your answer, you can set the QHeaderView to resize to contents automatically, but if you do a lot of adding and removing this will slow things down. I prefer to manually resize with a large addition/subtraction, particularly since the user might find it annoying to be unable to resize it themselves.
Here's some example code that enables word wrap, sets the ellipse to appear in the middle (my preference), and then manually resizes the row height to fit the contents at word boundaries:
ui->tableView->setWordWrap(true);
ui->tableView->setTextElideMode(Qt::ElideMiddle);
ui->tableView->resizeRowsToContents();
I only add to my code:
ui->tableView->verticalHeader()->setSectionResizeMode(QHeaderView::ResizeToContents);
As far as I know, the only way to implement multiline text drawing in cells is implementing own delegate.
You can derive from QItemDelegate.
You'll have to
implement own sizeHint function, based on QFontMetrics
and override drawDisplay function to actually display text. You can use QPainter::drawText to display multiline text. So, you don't have to care about drawing focus and selection rectangles and own painting function will be simple.
tableView->resizeRowsToContents();
I am having trouble to put new line in QTableWidgetItem. Here is the code :
QTableWidget* item = new QTableWidgetItem;
item->setText("Line1 \n Line2");
With this code the item text is not displayed in two lines, i.e it seems that \n character is ignored.
I have a workaround to do this, with using QPlainTextEdit and the function setCellWidget, in that case everything work as expected but is more ugly, and I prefer not to make additional widget just to show text in multiple lines.
I think your code is fine to separate lines. But you should change the size of each row to show multi-lines.
And after resizing row's height:
You see it's OK.