Return Multiple Values to QML from C++

In some cases it is required to return several values from a C++ function to the QML code. In my case, I call the function that checks the syntax of the Qt script that is passed as a string. The QScriptSyntaxCheckResult class does that check for me. If an error is found inside the script, I want to get back the error message and the line and column where the error was detected. In this case a QVariantMap class is the elegant and effective solution. In my C++ code, I pack the values I want to return into an instance of a QVariantMap class:

QVariantMap QMLFile::checkScriptSyntax(QString input) const
{
    QScriptSyntaxCheckResult result = QScriptEngine::checkSyntax(input);

    QVariantMap value;
    value.insert("errorMessage", result.errorMessage());
    value.insert("errorLineNumber", result.errorLineNumber());
    value.insert("errorColumnNumber", result.errorColumnNumber());
    return value;
}

In my QML code, I can now access the values in the following manner, after opening a file that contains a Qt script and passing its contents to the C++ function:

onClicked: {
 var fileContent = QMLFile.getFileContents();
 var result = QMLFile.checkScriptSyntax(fileContent);

 if(result.errorMessage !== "")
 {
  console.log("Error on line " + result.errorLineNumber + ", column " + result.errorColumnNumber + " : " + result.errorMessage);
 }
 else
 {
  console.log("Script syntax is correct!");
 }
}

The result is further used in the ToolTipRectangle element, which is a Text element that appears when the mouse is hovered over the line which contains an error.

import QtQuick 1.1

Rectangle {

    property string toolTip : ""
    property bool showToolTip: false

    Rectangle{
        id: toolTipRectangle
        anchors.horizontalCenter: parent.horizontalCenter
        anchors.top: parent.bottom
        width: parent.toolTip.length * toolTipText.font.pixelSize / 2
        height: toolTipText.lineCount * (toolTipText.font.pixelSize + 5)
        z:100

        visible: parent.toolTip !== "" && parent.showToolTip
        color: "#ffffaa"
        border.color: "#0a0a0a"

        Text{
            id:toolTipText
            width: parent.parent.toolTip.length * toolTipText.font.pixelSize / 2
            height: toolTipText.lineCount * (toolTipText.font.pixelSize + 5)
            text: parent.parent.toolTip
            color:"black"
            wrapMode: Text.WordWrap
        }
    }

    MouseArea {
        id: toolTipArea
        anchors.fill: parent
        onEntered: {
            parent.showToolTip = true
        }
        onExited: {
            parent.showToolTip = false
        }
        hoverEnabled: true
    }
}

The end result looks like this:

Syntax check result

References:

Q_INVOKABLE member function: Valid argument types
Implementing tool tips in QML by Evgeny. Also posted on my website