QPointerEvent throws error

jsulm

@curiosity You probably need to tell the compiler which overload you want to connect, see https://wiki.qt.io/New_Signal_Slot_Syntax#Overload

curiosity

@JonB
these are errors in QtCreator. i am yet to compile.

jsulm

@curiosity Well, then compile.
Code model can produce false errors in QtCreator.

curiosity

@jsulm

i am trying to print the edited text(values entered by the user) onto the console. but still getting this error

Christian Ehrlicher

SIGNAL(&QLineEdit::textEdited)

really?

You should read the Qt signals and slot documentation and also re-read the wiki page which @jsulm already pointed you to.

curiosity

@Christian-Ehrlicher

connect(echoComboBox, &QComboBox::editTextChanged(echoLineEdit),
        this, [=](const QString &edited){qDebug() << edited;});

i made the above change. but signal is giving error
"call to non static function without an object argument". editTextChanged has qstring . i tried with qsting and qlineEdit as arg. its giving same error with both

jsulm

@curiosity Please read the documentation! What you're doing is simply wrong and not even valid C++!
You do not pass parameters when calling connect! Parameters are passed to the signal when it is emitted and then from the signal to slot.

connect(echoComboBox, &QComboBox::editTextChanged,
        this, [=](const QString &edited){qDebug() << edited;});

curiosity

@jsulm

thanks for correcting.

i am trying to echo the text entered by the user into QCombobox in the next line.

connect(echoComboBox, &QComboBox::currentTextChanged,this, &Window::onCurrentTextChanged);

    auto text = echoComboBox->currentText();
 passwordLineEdit = new QLineEdit;

    passwordLineEdit->setPlaceholderText("Password entered is : ");     //But this line is displayed in a new window. and password is not echoed.

passwordLineEdit->show();

    echoComboBox->show();

JonB

@curiosity said in QPointerEvent throws error:

//But this line is displayed in a new window

You have created a new QLineEdit but not put it anywhere (e.g. on an existing window), so where do you expect it to go? I do not know why you are choosing to create a new QLineEdit dynamically, but give it a parent and/or place it on some widget's layout.

I really don't know what you are doing with a combobox."i am trying to echo the text entered by the user into QCombobox" --- what text is being entered how by user into combobox. Why in the world would you have a combobox, to choose an existing item from, if you want a user to enter a line of text for a password?

passwordLineEdit->setPlaceholderText("Password entered is : "); //But this line is displayed in a new window. and password is not echoed.

"Password is not echoed", what do you mean or expect? All you have done here is set the placeholder text of a QLineEdit to a fixed string. I see nothing in your code which perhaps copes/displays the auto text = echoComboBox->currentText(); anywhere.

@jsulm gave you sample code for picking up changed edited text. All you have to do is change his lambda slot to (preferably using his signal) to call a method of you own, like you show with &Window::onCurrentTextChanged, and write the code in that to access the current text or the text parameter sent from void QComboBox::editTextChanged(const QString &text) signal.

jsulm

@curiosity said in QPointerEvent throws error:

auto text = echoComboBox->currentText();
passwordLineEdit = new QLineEdit;
passwordLineEdit->setPlaceholderText("Password entered is : ");

Please think about this code and why it can't do what you want it to do and why you get a new window.
@JonB gave you all needed hints.

curiosity

@jsulm @JonB

echoLayout->addWidget(passwordLabel, 2, 0);
echoLayout->addWidget(passwordLineEdit, 2, 1, 2, 3 );
this is added to the grid layout

QObject::connect(echoComboBox, &QComboBox::editTextChanged, this, [=](const QString &text) {
Window::onCurrentTextChanged(text);
});

void onCurrentTextChanged(const QString &text)
{
    passwordLineEdit->setPlaceholderText("Password entered is : ");
    passwordLineEdit->setText(text);  //Is this the right way to set the text   received from above signal. }

value entered is still not reflecting

jsulm

@curiosity said in QPointerEvent throws error:

QObject::connect(echoComboBox, &QComboBox::editTextChanged, this, [=](const QString &text) {
Window::onCurrentTextChanged(text);
});

There is no need for a lambda, just connect onCurrentTextChanged directly to the signal.

curiosity

@curiosity

JonB

@curiosity said in QPointerEvent throws error:

value entered is still not reflecting

Not sure where you are at now. Yes, calling passwordLineEdit->setText(text); should set the text from the string. Check what is in the string. Check you are getting the signal by putting a qDebug() or something in the slot so that you know it is being called.

curiosity

@JonB
Ialready checked by planting a breakpoint in onCurrentTextChanged . on running and entering the text in the place holder i was expecting to hit the breakpoint, but it didnt hit.
this is my connect statement

connect(echoComboBox,&QComboBox::editTextChanged, this, &Window::onCurrentTextChanged);

void onCurrentTextChanged(const QString &text)
{
    qDebug() << QString(" entered text is ")<<  text;

//nothing is printed here in the application tab in qtcreator. it is not even hitting this breakpoint
passwordLineEdit->setPlaceholderText("Password entered is : ");
passwordLineEdit->setText(text);
passwordLineEdit->show();
passwordLineEdit->setEchoMode(QLineEdit::PasswordEchoOnEdit);

Christian Ehrlicher

@curiosity said in QPointerEvent throws error:

void onCurrentTextChanged(const QString &text)...

This is a free function... How does this even compile?

Please provide your full relevant code which actually compiles.

curiosity

@Christian-Ehrlicher
but i am using this as a slot. Please check the connect statement

Christian Ehrlicher

void MainWindow::onCurrentTextChanged() and void onCurrentTextChanged() are two different functions. Provide your full code including the header.

curiosity

This post is deleted!

Christian Ehrlicher

And now please format your code with the code (</>) tags so it is readable for others.
Your header does not match the source - this does not compile. And then you have a local variable echoLabel but connect the member later on...