problem to send a double through a TextInput

[cosmoff]

Hello everyone,

Like I said, I would like to retrieve a double from a TextInput but I retrieve only the rounded value.

I show you my code :

Rectangle{
                color : "green"
                height : parent.height/4
                width : parent.width

                TextInput{

                    id: idTextInput
                    inputMethodHints: Qt.ImhFormattedNumbersOnly
                    padding : 20
                    text: controller.value
                    font.pixelSize: 13
                    font.bold: false
                    color: "black"
                    anchors.verticalCenter: parent.verticalCenter
                    anchors.horizontalCenter: parent.horizontalCenter
                    validator: DoubleValidator{bottom: 0 ;
                                              top: 100;
                                              decimals : 3
                                              notation: DoubleValidator.StandardNotation}


                    onAccepted: {
                        controller.newValuefromTextInput( parseFloat(text) )
                        controller.value = parseFloat(idTextInput.text)
                        console.log("value  = " + text)
                    }


                }
            }

and the methode newValuefromTextInput from controller is :

void Controller::newValuefromTextInput(double v)
{
    qDebug() << "value = " << v ;
}

Do you have an idea of the problem?

Thanks

[Pradeep P N]

Hi @cosmoff

Code looks fine, it do print the double value in the C++

• QML

        TextInput {
            id: idTextInput

            focus: true
            anchors.fill: parent
            verticalAlignment: TextInput.AlignVCenter
            font {
                pointSize: 15;
                bold: true;
            }

            validator: DoubleValidator {
                top: 100; // 100 is the maximum acceptable value (More than 100 its not acceptable & onAccepted will not be called). 
                bottom: 0;
                decimals: 3;
                notation: DoubleValidator.StandardNotation
            }

            onAccepted: {
                console.log("value  = " + text)
                cppObject.doubleValueQML(idTextInput.text)

            }
        }

• main.cpp

    engine.rootContext()->setContextProperty("cppObject", &cppClass);

• MyClass.h & MyClass.cpp - I am using public slots function to QML

public slots:
    void doubleValueQML(double value);


void MyClass::doubleValueQML(double value)
{
    qDebug() << Q_FUNC_INFO << value << endl;
}

Output:

QML debugging is enabled. Only use this in a safe environment.
qml: value  = 100.000
void MyClass::doubleValueQML(double) 100 

qml: value  = 99.99
void MyClass::doubleValueQML(double) 99.99 

qml: value  = 99.100
void MyClass::doubleValueQML(double) 99.1 

qml: value  = 99.001
void MyClass::doubleValueQML(double) 99.001 

qml: value  = 99.999
void MyClass::doubleValueQML(double) 99.999 

All the best.

[cosmoff]

@Pradeep-P-N

thanks for your answer,

I do not understand how you code can work because you insert a string in your function MyClass::doubleValueQML(double) which need a double. So I put a parseFloat() But like I said the function seems to round the value

[Pradeep P N]

@cosmoff said in problem to send a double through a TextInput:

parseFloat

I tried both the ways, It works properly even with parseFloat(idTextInput.text)

            onAccepted: {
                console.log("value  = " + text)
                cppObject.doubleValueQML(parseFloat(idTextInput.text))
            }

• Output:

QML debugging is enabled. Only use this in a safe environment.
qml: value  = 11.11
void MySpinBoxValue::doubleValueQML(double) 11.11 

qml: value  = 22.22
void MySpinBoxValue::doubleValueQML(double) 22.22 

qml: value  = 99.100
void MySpinBoxValue::doubleValueQML(double) 99.1 

qml: value  = 99.999
void MySpinBoxValue::doubleValueQML(double) 99.999 

[cosmoff]

@Pradeep-P-N
Yes I understood my problem. In fact, because of validator I cannot fill the textInput with the character ' . ' for the float like 70.5 but only 70,5 and so Qt does not understand the character ' , '

Do you have an idea why my validator do not want the character ' . '

[J.Hilk]

@cosmoff said in problem to send a double through a TextInput:

Do you have an idea why my validator do not want the character ' . '

localization issues.

I know of 3 ways to solve this.

• setting the locale property appropriately: https://doc.qt.io/qt-5/qml-qtquick-doublevalidator.html#locale-prop
• reimplementing valueFromText, with your own parser
• replacing the , with in your onAccepted method

onAccepted: {
                        var modifiedText = text.replace(",",".")
                        controller.newValuefromTextInput( parseFloat(modifiedText) )
                        controller.value = parseFloat(modifiedText)
                        console.log("value  = " + text)
                    }

[cosmoff]

@J.Hilk

yes it works with : var modifiedText = text.replace(",",".")

thanks a lot