Specifying font for many Text-elements in Qt QML

Question

I have a widget specified through a QML file. This widget contains a top levelRectangle which contains two Columns. Each of these Columns

Answer 1

One possible solution is to write a function, that iterates over the children of a passed element (for example a Column). In this function all the properties can be set:

import QtQuick 1.0

    Rectangle {
    Row {
        spacing: 10

        Column {
            id: col1

            Text {
                property bool useStyle: true
                text: "Foo1"
            }
            Text {
                property bool useStyle: true
                text: "Bar1"
            }
            Text {
                property bool useStyle: true
                text: "Baz1"
            }
        }

        Column {
            id: col2

            Text {
                property bool useStyle: true
                text: "Foo2"
            }
            Text {
                text: "not styled"
            }
            Text {
                property bool useStyle: true
                text: "Baz2"
            }
        }
    }

    function setTextStyle(parentElement) {
        for (var i = 0; i < parentElement.children.length; ++i) {
            console.log("t", typeof parentElement.children[i]);
            if (parentElement.children[i].useStyle) {  // apply style?
                parentElement.children[i].color = "blue";
                parentElement.children[i].font.family = "Arial"
                parentElement.children[i].font.bold = true;
                parentElement.children[i].font.italic = true;
                parentElement.children[i].font.pixelSize = 12;
            }
        }
    }

    // set style
    Component.onCompleted: {
        setTextStyle(col1);
        setTextStyle(col2);
    }
}

Each element, that contains the property useStyle that is set to true, gets styled. This is shorter, than assigning the style manually, but you can still define which elements should get styled or not.

Answer 2

Another possibility is to write a new QML component, that inherits from Text an sets some properties by default:

StyledText.qml

import QtQuick 1.0

Text {
    // set default values
    color: "blue"
    font.family: "Arial"
    font.bold: true
    font.italic: true
    font.pixelSize: 12
}

main.qml

import QtQuick 1.0

Rectangle {
    Row {
        spacing: 10

        Column {
            StyledText {
                text: "Foo1"
            }
            StyledText {
                text: "Bar1"
            }
            StyledText {
                text: "Baz1"
            }
        }

        Column {
            StyledText {
                text: "Foo2"
            }
            StyledText {
                text: "Bar2"
            }
            StyledText {
                text: "Baz2"
            }
        }
    }
}

Answer 3

In Qt 5.6 (at least, probably earlier too), you can use Qt.font() to dynamically allocate a font object and refer to it elsewhere. So, this works:

property font myFont: Qt.font({
    family: fontfamily,
    bold: fontbold,
    italic: fontitalic,
    pixelSize: fontpixelsize
});

Text
{   
    color: fontcolor
    font: parent.myFont
}

More info on Qt.font() here: https://doc-snapshots.qt.io/qt5-5.6/qml-qtqml-qt.html#font-method