I'm not sure if the title is correct but this is the situation:
When a row is selected and contains Application Status of FULL_MEMBER,
A pushButton is enabled else it is disabled.
You have to get the text of the item (cell) in the fifth column of the selected row, each time the selection changes.
Have a slot like this in your widget:
private slots:
void tableSelectionChanged();
In the widget constructor, connect it to the table widget signal itemSelectionChanged:
connect(ui->tableWidget, SIGNAL(itemSelectionChanged()), this, SLOT(tableSelectionChanged()));
The slot definition is like this:
//retrieve a list of all selected rows
QModelIndexList list = ui->tableWidget->selectionModel()->selectedRows();
if(list.size() > 0)
{
//retrieve the index of the first (and only, maybe?) selected row
int row = list[0].row();
const int col = 4; //Application Status column id
QTableWidgetItem * item = ui->tableWidget->item(row, col); //the item we want to inspect
ui->pushButton->setEnabled( item->text() == "FULL_MEMBER" );
}
Related
I am working with a qtableview that is filled by a model and has two columns. I can get the contents of a selected cell no problem but only want the contents of the second column even if the first column is clicked.
void MainWindow::on_tableView_clicked(const QModelIndex &index)
{
QString cellText;
if (index.isValid()) {
cellText = index.data().toString();
}
ui->lineEdit->setText(cellText);
}
the index looks like this for column 0:
QModelIndex(7,0,0x55f2e5d06b00,QStandardItemModel(0x55f2e5d09740))
And for column 1:
QModelIndex(8,1,0x55f2e5d06b00,QStandardItemModel(0x55f2e5d09740))
I tried to find a way to change the index for the cell that is clicked but I think there is no way to change it directly and I can not seem to find a way to tell my function to always use column 1 the second column.
Thanks for your time.
Code edited to reflect comment 1 below
{
QString cellText;
if (index.isValid()) {
QModelIndex idx = index;
idx = idx.sibling(idx.row(), 1);
cellText = idx.data().toString();
}
ui->lineEdit->setText(cellText);
}```
I have a QTableWidget and for all rows I set a setCellWidget at one column to a button.
I would like to connect this button to a function that delets this row.
I tried this code, which does not work, because if I simply click my button I do not set the current row to the row of the button.
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
QPushButton *b = new QPushButton("delete",this);
ui->tableWidget->setCellWidget(ui->tableWidget->rowCount()-1,0,b);
connect(d,SIGNAL(clicked(bool)),this,SLOT(deleteThisLine()));
...
void MainWindow::deleteThisLine()
{
int row = ui->tableWidget->currentRow();
ui->tableWidget->removeRow(row);
}
How can I connect my button to a function in a way that the function knows which button (at which row) was pressed?
To remove the row we must first get the row, if we are inserting widgets inside the cells the currentRow() method will not return the appropriate row, in many cases it will return the row of the last cell without widget that has been selected.
For that reason you must opt for another solution, for this case we will use the indexAt() method of QTableWidget, but for this we need to know the position in pixels of the cell. when one adds a widget to a cell, this cell will be the parent of the widget, so we can access from the button to the cell using the parent() method, and then get the position of the cell with respect to the QTableWidget and use it in indexAt(). To access the button we will use the sender().
When the current cell is removed the focus is lost, a possible solution is to place the focus again in another cell.
void MainWindow::deleteThisLine()
{
//sender(): QPushButton
QWidget *w = qobject_cast<QWidget *>(sender()->parent());
if(w){
int row = ui->tableWidget->indexAt(w->pos()).row();
ui->tableWidget->removeRow(row);
ui->tableWidget->setCurrentCell(0, 0);
}
}
Use this connection way to connect signal to a slot:
connect(ui->btnDelete, &QPushButton::clicked, this,&MainWindow::deleteRow);
And delete for example a row on call function:
void MainWindow::deleteRow()
{
int row = ui->tableWidget->currentRow();
ui->tableWidget->removeRow(row);
}
Create a custom class, where you pass the created push button object and the row index. From your custom push button class, handle the push button press event and emit a custom signal (it will carry the index number) handled from the object where your custom pushbutton is created. Some related code are below, to give you a hint:
.h
class mypushbutton {
explicit mypushbutton(QObject *parent = 0, QPushButton *pushbutton = 0, int index = 0);
signal:
void deleteRow(int index);
}
.cpp
mypushbutton() {
connect(pushbutton, SIGNAL(clicked(bool)), this, SLOT(actionButtonClick(bool)));
}
actionbuttonclicked() { emit deleteRow(index);}
I'm trying to put a MySQL table into a treeView.
Each entry has three values in the database - id, text, parentId.
This treeView needs to be editable so I really like the QSqlTableModel approach, as the functionality to save back to database is already built in.
Now, the treeView is showing all entries in the same line, of course, and I need a hierarchy. What would be the best way to build this hierarchy, while maintaining the editing and saving capabilities?
(I'm using MySQL.)
mainwindow.h
private: QSqlTableModel* goalModel;
mainwindow.cpp
(this makes a flat table hierarchy. the table is filtered based on which entry is clicked in another table)
void MainWindow::on_tableViewGoals_clicked(const QModelIndex &index)
{
goalModel = new QSqlTableModel(this);
goalModel->setTable("goals");
//Gets the id from the clicked entry to use as filter
QString idGoals = index.sibling(row,0).data().toString();
goalModel->setFilter( "id_goals=" + idGoals );
goalModel->setEditStrategy(QSqlTableModel::OnRowChange);
goalModel->select();
ui->treeView->setModel(goalModel);
...
I tried this. It's wrong, but I don't really know why. (the third column contains the parentId value, if the entry has it)
for (int row = 0; row < goalModel->rowCount(); ++row)
{
//if the entry has a value over 0 in the parentId column
if (goalModel->index(row,2).data().toInt() > 0)
{
//get number in column 2
int parentId;
parentId = goalModel->index(row,2).data().toInt();
QModelIndex newChild = goalModel->index(row,0);
//find QModelIndex row with matching number in column 0
for (int row = 0; row < goalModel->rowCount(); ++row)
{
if (goalModel->index(row,0).data().toInt() == parentId )
{
//make this entry that entry's child
QModelIndex newParent = goalModel->index(row,0);
newChild = goalModel->index(0,0,newParent);
}
}
}
}
All indexes are already made, so no need to make new ones, just assign a parent to all those who have one. How best to do that?
I want QTableWidget with the next behaviour:
It should be row selectable and only one row may be selected, I can do it with setSelectionBehavior(QAbstractItemView::SelectRows);
setSelectionMode(QAbstractItemView::SingleSelection)
Now I want row to be selected only when user click on item which is in first column. And selection should not change when user click on items which are in other column. How should I do it?
You need to subclass QTableWidget to reimplement mousePressEvent in this way
#include <QMouseEvent>
#include <QTableWidget>
class Table : public QTableWidget {
virtual void mousePressEvent(QMouseEvent * event) {
//the selectable column index
const int SELECTABLE_COLUMN = 0;
//retrieve the cell at pos
QModelIndex i = indexAt(event->pos());
//check if the item is in the desired column
if ( i.column() == SELECTABLE_COLUMN ) {
//behave as normal
QTableView::mousePressEvent(event);
}
//else nothing (ignore click event)
}
};
Notes
Works the same for QTableView
I have derived the class QTreeWidget and creating my own QtPropertyTree. In order to populate the tree with widgets (check boxes, buttons, etc) I am using the following code:
// in QtPropertyTree.cpp
QTreeWidgetItem topItem1 = new QTreeWidgetItem(this);
QTreeWidgetItem subItem = new QTreeWidgetItem(this);
int column1 = 0
int Column2 = 1;
QPushButton myButton = new QPushButton();
this->setIndexWidget(this->indexFromItem(this->subItem,column1), myButton);
QCheckBox myBox = new QCheckBox();
this->setIndexWidget(this->indexFromItem(this->subItem,column2), myBox);
This works fine, but the problem is that i want to avoid using the "indexFromItem" function since it is protected, and there are other classes that are populating the tree and need access to that funcion. Do you know any alternative to using that function?
You can try to use your QTreeWidget's model (QAbstractItemModel) to get the right index by the column and row numbers:
// Row value is 1 because I want to take the index of
// the second top level item in the tree.
const int row = 1;
[..]
QPushButton myButton = new QPushButton();
QModelIndex idx1 = this->model()->index(row, column1);
this->setIndexWidget(idx1, myButton);
QCheckBox myBox = new QCheckBox();
QModelIndex idx2 = this->model()->index(row, column2);
this->setIndexWidget(this->indexFromItem(idx2, myBox);
UPDATE
For sub items, the same approach can be used.
QModelIndex parentIdx = this->model()->index(row, column1);
// Get the index of the first child item of the second top level item.
QModelIndex childIdx = this->model()->index(0, column1, parentIdx);
The obvious solution is to de-protect indexFromItem like this:
class QtPropertyTree {
...
public:
QModelIndex publicIndexFromItem(QTreeWidgetItem * item, int column = 0) const
return indexFromItem (item, column) ;
}
} ;