I have a few inter-dependent combo boxes and, as new options come, new entries need to be added. I managed to reduce the number of entries by grouping certain family-like members, but now I need a new combobox, and it's getting cumbersome, plus it starts to look ugly. So I thought of adding a submenu. Currently, my way of populating the combo box(es) is through a struct with enum and std::string, something like this:
QComboBox *combo {new QComboBox(vbox)};
for(int i=0; i<struct.LIST_ALL; ++i)
combo->insertItem(i, struct.names[i].c_str());
If I need to add a submenu at a certain position, how do I proceed? The documentation for QComboBox doesn't seem to have anything related to a submenu. Am I going the wrong way?
This answers my question.
Related
I want my table to be not selectable, so that only check boxes or radio buttons could be selected, but not the cell itself. Now I have:
How can I fix this?
Solutions for QTableWidget can help too.
QTableView *test = new QTableView();
test->setSelectionMode(QAbstractItemView::NoSelection);
gives the wanted result.
In a QTableWidget I can configure the rows to be resizable by the user on run time by setting the verticalHeader's resizeMode to Interactive like this:
table.verticalHeader().setResizeMode(QtGui.QHeaderView.Interactive)
How would I configure a similar behavior for QListWidget? Unfortunately the QListWidget resizeMode does not have an Interactive item and I haven't found anything similar.
The best would be to configure it for the whole list but when it's possible for single rows/items that would be ok, too.
As doc said:
This view does not display horizontal or vertical headers; to display
a list of items with a horizontal header, use QTreeView instead.
So you should use QTreeView (or QTreeWidget) with one column and maybe with specific style.
Another approach. There are no header, so you can provide some instrument (dialog window, slider or something else) where user will be able to change row height, to change row height you should just use setData() and set QSize() to Qt::SizeHintRole. For example:
ui->listWidget->model()->setData(ui->listWidget->currentIndex(),
QSize(40,40),Qt::SizeHintRole);
Aloha
I have a QTableWidget with two columns that are currently using a ComboboxDelegate (my subclass of QItemDelegate) to present options to the user. I'd like the choice in the first column to effect the options available in the second, for the current row only.
E.g have a list of cars in the first column, and in the second a list of colours which are available for that car. Other rows to have different cars selected and thus different colour choices available.
From what I can see, I can only set an item delegate per row or column, so I can't see how to change the options in the second column's delegate without affecting all the other rows.
Is this possible? I'd really like to avoid going to a full view/model separation as I have quite a bit of code looking at this QTableWidget already (and I'm under time pressure)
Well for those interested; I went back to my pre-delegate approach, which was to use QTableWidget::setItemWidget() to provide a combobox widget for each cell.
I subclassed qcombobox to take a reference to the table, and connected the combobox CurrentIndexChanged with a slot to update the table data.
(setting a widget in a cell does not affect the tablewidget data unless you do this).
Using a full combobox like this is more expensive than an itemdelegate, but my tables are very small so I can get away with it. The rendering of the combobox is not as nice as the delegate (the combobox is visible all the time instead of only during editing in the delegate's case), but with time I'm sure I can improve on this.
I want to delete a selected row from the table when I click on the delete button.
But I can't find anything regarding deleting rows in the Qt documentation. Any ideas?
You can use the bool QAbstractItemModel::removeRow(int row, const QModelIndex & parent = QModelIndex()) functionality for this.
Here you can find an example for all this.
Also, here is an inline quote from that documentation:
removeRows()
Used to remove rows and the items of data they contain
from all types of model. Implementations must call beginRemoveRows()
before inserting new columns into any underlying data structures, and
call endRemoveRows() immediately afterwards.
The second part of the task would be to connect the button's clicked signal to the slot executing the removal for you.
If you are removing multiple rows you can run into some complications using the removeRow() call. This operates on the row index, so you need to remove rows from the bottom up to keep the row indices from shifting as you remove them. This is how I did it in PyQt, don't know C++ but I imagine it is quite similar:
rows = set()
for index in self.table.selectedIndexes():
rows.add(index.row())
for row in sorted(rows, reverse=True):
self.table.removeRow(row)
Works perfectly for me! However one thing to know, in my case this function gets called when a user clicks on a specific cell (which has a pushbutton with an 'X'). Unfortunately when they click on that pushbutton it deselects the row, which then prevents it from getting removed. To fix this I just captured the row of the sender and appended it to the "remove_list" at the very beginning, before the "for loops". That looks like this:
rows.add(self.table.indexAt(self.sender().pos()).row())
You can use another way by deleting the row from database, then clear the model and fill it again, this solution is also safe when you are removing multiple rows.
I feel really silly asking this question but how do you add any data to a Combo Box? Like I want to display A,B and C as my dropbox strings but I have tried out many things, still my Combo Box does not display anything.
I have tried setting the 'Data' property with A;B;C..still it doesn't show this.
I tried this in my Oninitdialog() function:
CComboBox* pComboBox = (CComboBox*)GetDlgItem(IDC_SENSOR_LIST);
CString string;
for(int i=0;i<10; i++)
{
string.Format("String %d", ++i);
pComboBox->AddString(string);
}
..
still no change. It may be I might not be doing something really silly but not able to figure it out at the moment. Kindly help.
Cheers.
Make sure your combobox has a height that can hold all entries. The height of a combo box doesn't affect the combo box itself, but the dropdown list.
You can change it in the dialog editor:
Click on the down arrow of the combo box, now there should be a rectangle that allows you to change the height of the combobox dropdown list. Make it large enough to hold all entries.