I need a piece of code to check that the user has selected at least one row in a QTableWidget
The QTableWidget can be referenced using ui->tableWidget.
I'm trying to check there are selecting, if not, display a message box, if so, moving on to code I have written.
Thanks.
You can obtain the selected rows from the selection model like:
QItemSelectionModel *selectionModel = ui->tableWidget->selectionModel();
QModelIndexList *selectedRows = selectionModel->selectedRows();
if (selectedRows.size() > 0) {
// There is at lease one selected row.
}
Related
I'm retrieving a set of results from the database and I want to populate the QComboBox with the resulting columns from the database (each row of the QComboBox should have the same columns as database result) and after that I would like to be able to retrieve from one row of the QComboBox a specific column and use it further in the app. I'm thinking if it would be possible to add the QTableView to QComboBox. I'm want to do this because I want to add more meaning to the results in a way that some result columns are just plain numbers and other are the description information.
I found out that it would be possible to concatenate the result and populate the QComboBox but this will leave me with only one value for each row to work with and I have to explode the string to obtain the exact part that it is needed to work with.
The popup that comes by default is a QListView, this can be changed with any object that inherits from QAbstractItemView, and in this case a QTableView will be used for it to use the setView() method, the result when clicking only should return a item of the selected row, then to set the column to be displayed after being selected will use the method setModelColumn() indicating the position of the column, but before that the model is set to the QComboBox using the method setModel().
# my model
model = new QSqlTableModel;
model->setTable("person");
model->select();
# setModel
comboBox->setModel(model);
# select column
comboBox->setModelColumn(1);
QTableView *view = new QTableView(this);
comboBox->setView(view);
Note: The model is set to QComboBox, not to QTableView. Also you could have problems with the width of QTableView, so we must resize, in my case use the following:
view->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
view->setMinimumWidth(500);
The complete example can be found in the following link
The first row is selected by default, when I shift-select the last row I expect that all rows will be selected but no, it only selects the visible rows of the QTableView.
I have a QTableView displaying data from a database-model. It is configured to allow extended selection (ctrl, shift etc) and to select rows only (not cells). The content is changing based on other parameters, and whenever I update the model I select by default the first row of my QTableView.
ui->tableView->setModel(model);
ui->tableView->setColumnHidden(UidColumn, true);
ui->tableView->setSelectionMode(QAbstractItemView::ExtendedSelection);
ui->tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
ui->tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
ui->tableView->verticalHeader()->hide();
ui->tableView->setAlternatingRowColors(true);
// This is done whenever the content changes
QModelIndex index = model->index(0,0);
ui->tableView->setCurrentIndex(index);
I hide the vertical headers because nothing to display there, and I hide the first column because it is not relevant for the user.
The first row is displayed as selected, I even logged the changes of focus and the tableView->selectionModel()->selectedRows() is always good (i.e. returning QModelIndex(0,0)). But when I do the shift-click on the last row, it is like the first row was never selected at all.
If I manually select the first row (or any row), the next shift-click will work perfectly. If I do a ctrl-click, the multiselection works perfectly. It is like my default selection (done by the code) is ignored with shift-click.
The default QModelIndex(0,0) selects a cell that is part of the hidden column. Even if displayed as a selected row, apparently it messes up the shift-selection.
If I do not hide the first column, it works fine.
If I use QModelIndex index = model->index(0,1); it works fine.
A simpler solution is to do ui->tableView->selectRow(0);
I have a Qt project where I have a QStandardItemModel called stockModel. This model is linked to a QTableView called tvStock.
I have a button called btnDelete which has a clicked event set up as follows:
void StockItems::on_btnDelete_clicked()
{
//delete
}
How do I delete the selected row of tvStock from stockModel?
I assume I can start with this (but I'm not sure how to complete it):
stockModel->removeRow(/* What goes here? */);
Otherwise let me know if I'm completely on the wrong track.
Update:
I found and modified some code that allows to me to delete the row if the entire row's contents are selected:
QModelIndexList indexes = ui->tvStock->selectionModel()->selectedRows();
while (!indexes.isEmpty()) {
stockModel->removeRows(indexes.last().row(), 1);
indexes.removeLast();
}
Is there a way this code could be modified to delete the entire row if only one of the row items is selected?
Thanks!
I need help with customizing a QTableView, I have defined a QTableView as this example show, which I found on the internet:
model = new QStandardItemModel(2,3,this); //2 Rows and 3 Columns
model->setHorizontalHeaderItem(0, new QStandardItem(QString("ID")));
model->setHorizontalHeaderItem(1, new QStandardItem(QString("Name")));
model->setHorizontalHeaderItem(2, new QStandardItem(QString("Description")));
ui->tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
ui->tableView->setModel(model);
How can I define a size for each column separately i.e using percentages:
I would get first column 10% of the width second 50%, third 40%.
When I run the program and double click on a row in the QTableView, I can change the value of the cell clicked on , although I have defined a QTableView onDoubleclick method , I mean its like when you click on rename a file it highlights the text so you can modify, how can I disable that?
How to make the columns resizable, meaning can be resized by dragging their columns edge.
First: Use setColumnWidth() method after setModel(). For example:
//...
ui->tableView->setModel(model);
double ii = ui->tableView->columnWidth(0);
ui->tableView->setColumnWidth(1,0.4*ii);
ui->tableView->setColumnWidth(2,0.5*ii);
Third: To do this remove
ui->tableView->horizontalHeader()->setSectionResizeMode(QHeaderView::Stretch);
from your code.
I have problem getting selected rows from QTableWidget. I have table like this:
[id] [ key ]
0 test
1 pass
I want to get every row's key values. I tried QTableWidget->selectedIndexes(); but it says it's protected and I can't access that. When I tried QTableWidget->SelectionModel->selectedIndexes, I don't know how to loop through list and get the key values. Do anyone know better way how can I do it?
Regards.
I'm assuming that you set the selection behavior of your table widget to select rows.
You can always access the so-called "selection model" of any item view/widget. QTableWidget inherits from QAbstractItemView, which gives you access to this special model. This model can tell you the selected rows as a list of QModelIndex, which can then tell you the row. Once you've got them, you can access the table content, in your case the text in the column with index 1 (key column).
static const KEY_COLUMN = 1;
QList<QString> selectedKeys;
QItemSelectionModel *selectionModel = ui->tableWidget->selectionModel();
foreach(QModelIndex index, selectionModel->selectedRows())
selectedIDs << ui->tableWidget->item(index->row(), KEY_COLUMN)->text();
Because you are using QTableWidget, you probably want to be calling selectedItems(). Your results will be based on what you have set the selection behavior to, via setSelectionBehavior()
When you have a list of items, you can specifically get the second column item (if it wasn't selected already):
QTableWigetItem *keyItem = table->item(anItem->row(), 1);
QString val = keyItem->text();