I am trying to count how many buttons have been checked
void pracownik2::on_pushButton_4_clicked()
{
this->setWindowTitle("EKRAN");
QWidget *centralWidget = new QWidget;
int licznik=1;
QString licz;
QString kolumny = ui->lineEdit->text();
QString wiersze = ui->lineEdit_2->text();
QPushButton *button[wiersze.toInt()][kolumny.toInt()];
QGridLayout *controlsLayout = new QGridLayout;
for(int i=0;i<wiersze.toInt();i++)
{
for(int j=0;j<kolumny.toInt();j++)
{
licz = QString::number(licznik);
licznik++;
button[i][j] = new QPushButton(licz);
button[i][j]->setCheckable(1);
controlsLayout->addWidget(button[i][j], i, j);
}
}
QPushButton *okej = new QPushButton("Zatwierdź");
QPushButton *anul = new QPushButton("Anuluj");
controlsLayout->addWidget(okej, wiersze.toInt(), 0);
controlsLayout->addWidget(anul, wiersze.toInt(), 1);
controlsLayout->setHorizontalSpacing(0);
controlsLayout->setVerticalSpacing(0);
centralWidget->setLayout(controlsLayout);
setCentralWidget(centralWidget);
for(int i=0;i<wiersze.toInt();i++)
{
for(int j=0;j<kolumny.toInt();j++)
{
connect(button[i][j],SIGNAL(toggled(bool)),this,SLOT(tescik()));
}
}
connect(anul,SIGNAL(clicked()),this,SLOT(close()));
connect(okej,SIGNAL(clicked()),this,SLOT(okay2()));
}
void pracownik2::tescik()
{
miejsca++;
}
void pracownik2::okay2()
{
QString m=QString::number(miejsca);
QMessageBox::information(this,"elo","wybranych miejsc: " + m);
}
If i check buttons number 1,2,3 and press okay button it shows that 3 buttons have been checked BUT if I check button number 1 and uncheck it and press okay it shows that 2 buttons have been checked. How to make my variable increment only if I check button, not also when I uncheck it?
I'm sorry for the code edit, just couldn't make it look better
The signal toggled has a boolean parameter, add it to your slot, and adjust count according to it. Change connect:
connect(button[i][j],SIGNAL(toggled(bool)),this,SLOT(tescik(bool)));
And change slot:
void pracownik2::tescik(bool t) {
if (t) miejsca++;
else miejsca--;
}
Related
I would like to delete row where QPushButton is clicked how it is possible to I think it is reasonable to use slots but how to do it don't know , if you have any ideas how to get a row of selected button please share, thanks.
It is my table
It is a code where i add rows to my QTableWidget
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
for(int i = 0; i<20;i++)
ui->tableWidget->insertRow(ui->tableWidget->rowCount());
QVector<QString>vec;
vec<<"first"<<"sec"<<"third"<<"for"<<"fif"<<"first"<<"sec"
<<"third"<<"for"<<"fif";
vec<<"first"<<"sec"<<"third"<<"for"<<"fif"<<"first"<<"sec"
<<"third"<<"for"<<"fif";
for(int i = 0; i<ui->tableWidget->rowCount();i++)
{
for(int j = 0; j<ui->tableWidget->columnCount();j++)
{
if(j == 0)
{
QWidget* pWidget = new QWidget();
QPushButton* btn_edit = new QPushButton();
btn_edit->setText("Remove");
QHBoxLayout* pLayout = new QHBoxLayout(pWidget);
pLayout->addWidget(btn_edit);
pLayout->setAlignment(Qt::AlignCenter);
pLayout->setContentsMargins(0, 0, 0, 0);
pWidget->setLayout(pLayout);
ui->tableWidget->setCellWidget(i, j, pWidget);
continue;
}
QTableWidgetItem*item = new QTableWidgetItem(vec[i]);
item->setFlags(item->flags() ^ Qt::ItemIsEditable);
ui->tableWidget->setItem(i, j, item);
}
}
}
This task can be solved using the removeRow() method but before we must get the row. First of all we will connect all the buttons to a slot inside the loop as shown below:
*.h
private slots:
void onClicked();
*.cpp
[...]
QPushButton* btn_edit = new QPushButton();
btn_edit->setText("Remove");
connect(btn_edit, &QPushButton::clicked, this, &MainWindow::onClicked);
[...]
In the slot we can get the button that emits the signal through the sender() method, then we get QWidget parent (created with the name pWidget), this is the widget that is added to the QTableWidget and its position is relative to it, then we use the method indexAt() to get the QModelIndex associated with the cell, and this has the information of the row through the method row(). All of the above is implemented in the following lines:
void MainWindow::onClicked()
{
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);
}
}
Note: The setCurrentCell() method is used to set the focus since the last cell that has it has been deleted.
The complete example can be found in the following link.
When you are creating QPushButton just add :
btn_delete = new QPushButton("Remove", ui->tableWidget);
btn_delete->setObjectName(QString("%1").arg(ui->tableWidget->rowCount()));
connect(btn_delete, SIGNAL(clicked()), this, SLOT(CellButtonDeleteClicked()));
And create function CellButtonDeleteClicked()
void CellButtonDeleteClicked()
{
// by this line I can get the sender of signal
QPushButton *pb = qobject_cast<QPushButton *>(QObject::sender());
int row = pb->objectName().toInt();
ui->tableWidget->removeRow(row);
}
I would like to get a number of a QTableWidget row after selecting some topic in comboBox how it is possible to get the row, thanks.
void MainWindow::metto_stringa(int i)
{
QWidget *w = qobject_cast<QWidget *>(sender()->parent());
if(w)
{
int row = ui->tableWidget->indexAt(w->pos()).row();
ui->lineEdit->setText(QString::number( row ));
}
// ui->lineEdit->setText(QString::number( i ));
}
else if(i == 3)
{
// ui->tableWidget->setCellWidget(ui->tableWidget->rowCount(), i, "");
QString s = "Normal";
QComboBox *combo = new QComboBox;
combo->addItem("Below normal");
combo->addItem("Normal");
combo->addItem("Above normal");
combo->addItem("High");
combo->addItem("Real time");
connect(combo,SIGNAL(currentIndexChanged(int)),this,
SLOT(metto_stringa(int)));
ui->tableWidget->setCellWidget(ui->tableWidget->rowCount()-1, i,combo);
/* ui->tableWidget->setCellWidget(i,4,combo);
QTableWidgetItem*item = new QTableWidgetItem(s);
item->setFlags(item->flags() ^ Qt::ItemIsEditable);
ui->tableWidget->setItem(ui->tableWidget->rowCount()-1, i,
item);*/
continue;
}
In this case you should not use the parent of the QComboBox, you must use the same sender()
void MainWindow::metto_stringa(int index)
{
QWidget *w = qobject_cast<QWidget *>(sender());
if(w)
{
int row = ui->tableWidget->indexAt(w->pos()).row();
ui->lineEdit->setText(QString::number(row));
}
}
In the question I answered before I commented that you must access the widget that you use in the setCellWidget() function, in the previous case the widget had the following form:
QWidget <--- QPushButton
parent() sender()
ie you owe to that widget so we take advantage of sender() and parent() in the previous case. In the current case QComboBox is added directly.
In a for loop, I can construct a string.
foreach (...) {
QString str = "pushButton" + QString::number(count);
// this gives pushButton1
// Now I want to get the button widget that has this string as it's variable name
// and modify it in some way, e.g. change it's button caption
str->setText("New Title");
count ++;
}
Is this possible? if so, then how
edited: here's how i created the buttons
for (int i=0; i<total; i++) {
QPushButton *btn = new QPushButton();
btn->setObjectName("pushButton" + QString::number(i));
ui->horizontalLayout->addWidget(btn);
}
You can get the button through the parent and objectName, in your case the parent is this, so you should use the following:
QWidget* p = ui->horizontalLayout->parentWidget();
for(int count=0; count<total; count++){
const QString str = "pushButton" + QString::number(count);
QPushButton* btn = p->findChild<QPushButton *>(str);
btn->setText("someText");
}
In one of my windows I made a button responsible for creating dynamic array of buttons. After they are made I can't make 'anul' button close the window
Here's the code
QWidget *centralWidget = new QWidget;
int licznik=1;
QString licz;
QString kolumny = ui->lineEdit->text();
QString wiersze = ui->lineEdit_2->text();
QPushButton *button[wiersze.toInt()][kolumny.toInt()];
QGridLayout *controlsLayout = new QGridLayout;
for(int i=0;i<wiersze.toInt();i++)
{
for(int j=0;j<kolumny.toInt();j++)
{
licz = QString::number(licznik);
licznik++;
button[i][j] = new QPushButton(licz);
button[i][j]->setCheckable(1);
controlsLayout->addWidget(button[i][j], i, j);
}
}
QPushButton *okej = new QPushButton("Zatwierdź");
QPushButton *anul = new QPushButton("Anuluj");
if(anul->isDown() == true)
this->close();
controlsLayout->addWidget(okej, wiersze.toInt(), 0);
controlsLayout->addWidget(anul, wiersze.toInt(), 1);
controlsLayout->setHorizontalSpacing(0);
controlsLayout->setVerticalSpacing(0);
centralWidget->setLayout(controlsLayout);
setCentralWidget(centralWidget);
I also tried to change this->close() with centralWidget->close()
This code is executed one time only.
if(anul->isDown() == true)
this->close();
What you want is to connect the clicked() signal of the button to a function (slot)
connect(anul, SIGNAL(clicked()), this,SLOT(close()))
I'm working on a project where i'm trying to add a QPushButton into a QTableView.
also i want to connect that button to open a document from a database. So far i added the button and i wrote the connect statement for it but when i click on the button nothing happened.
here is my code
void MainWindow::DocumentTable()
{
tableview = new QTableView;
query = new QSqlQueryModel(this);
signalMapper = new QSignalMapper(this);
foreach(it,treeWidget->selectedItems())
{
for (int col=0; col< it->columnCount(); ++col)
{
qDebug() << col << it->text(col);
QSqlQuery qry;
qry.prepare("select * from document where Folno=:Folno");
qry.bindValue(":Folno", it->text(col));
qry.exec();
query->setQuery(qry);
tableview->setModel(query);
tableview->setEditTriggers(QAbstractItemView::NoEditTriggers);
for (int i = 0; i< 1000; i++)
{
button= new QPushButton("Open Document");
tableview->setIndexWidget(tableview->model()->index(i, 0), button);
signalMapper->setMapping(button, i);
}
connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(imageFROMdatabase()));
tableview->show();
Docwidget= new QDockWidget(this);
Docwidget->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
Docwidget->setWidget(tableview);
addDockWidget(Qt::RightDockWidgetArea,Docwidget);
Docwidget->show();
if(!query->submit())
{
QMessageBox::warning(0,"Error",query->lastError().text());
}
db.close();
}
}
}
and this is the slot function
void MainWindow::imageFROMdatabase()
{
QSqlQuery imageQuery;
imageQuery.prepare("SELECT * from doc_page where doc_no=:doc_no and f_number=:f_number");
imageQuery.bindValue(":doc_no", 1);
imageQuery.bindValue(":f_number",1);
imageQuery.exec();
imageQuery.next();
if( imageQuery.lastError().isValid())
{
QMessageBox::warning(0,"Error",imageQuery.lastError().text());
// QSqlDatabase::database().rollback();
}
else
{
// QByteArray ba1 = imageQuery.value(1).toByteArray();
QPixmap pic;
pic.loadFromData( ba);
scrollArea = new QScrollArea;
scrollArea->setBackgroundRole(QPalette::Dark);
scrollArea->setEnabled(true);
QString fileName = QFileDialog::getOpenFileName(this,"Open Image File",QDir::currentPath());
QImage image(fileName);
scene = new QGraphicsScene();
view = new QGraphicsView(scene);
item = new QGraphicsPixmapItem(QPixmap::fromImage(image));
scene->addItem(item);
xwidget= new QDockWidget(this);
xwidget->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
xwidget->setWidget(view);
addDockWidget(Qt::RightDockWidgetArea,xwidget);
xwidget->show();
db.close();
}
}
please tell if anything wrong in these codes.
The slot method is not same as signal method. They should have exact equal signatures. qDebug() should have generated some warnings for you. Read outputs carefully. imageFROMDatabase() method should accept an integer as its input too. Signals are not real functions. They are used to trigger another function which is matched in signature with them.
connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(imageFROMdatabase()));
Change it like this :
connect(signalMapper, SIGNAL(mapped(int)), this, SLOT(imageFROMdatabase(int)));
ans also :
void MainWindow::imageFROMdatabase( int x ) { ... }
Also if the signals and slots are not in a thread read the manual enum Qt::ConnectionType