How to draw text in QQuickItem?

literA2

Hi, I'm having this problem also.

I need to render a text on my custom geometry, I don't want to use QPainter because of the blurry text issue in iOS (using QQuickPaintedItem class).

Please advise. TIA.

seyed

I need it too, because performance.
I looked at Qt's source code (qquicktextnode.cpp) and I found following lines. Perhaps it helps someone...

QSGGlyphNode *QQuickTextNode::addGlyphs(const QPointF &position, const QGlyphRun &glyphs, const QColor &color,
                                 QQuickText::TextStyle style, const QColor &styleColor,
                                 QSGNode *parentNode)
{
    QSGRenderContext *sg = QQuickItemPrivate::get(m_ownerElement)->sceneGraphRenderContext();
    QRawFont font = glyphs.rawFont();
    bool preferNativeGlyphNode = m_useNativeRenderer;
    if (!preferNativeGlyphNode) {
        QRawFontPrivate *fontPriv = QRawFontPrivate::get(font);
        if (fontPriv->fontEngine->hasUnreliableGlyphOutline())
            preferNativeGlyphNode = true;
        else
            preferNativeGlyphNode = !QFontDatabase().isSmoothlyScalable(font.familyName(), font.styleName());
    }

    QSGGlyphNode *node = sg->sceneGraphContext()->createGlyphNode(sg, preferNativeGlyphNode);

    node->setOwnerElement(m_ownerElement);
    node->setGlyphs(position + QPointF(0, glyphs.rawFont().ascent()), glyphs);
    node->setStyle(style);
    node->setStyleColor(styleColor);
    node->setColor(color);
    node->update();

    /* We flag the geometry as static, but we never call markVertexDataDirty
       or markIndexDataDirty on them. This is because all text nodes are
       discarded when a change occurs. If we start appending/removing from
       existing geometry, then we also need to start marking the geometry as
       dirty.
     */
    node->geometry()->setIndexDataPattern(QSGGeometry::StaticPattern);
    node->geometry()->setVertexDataPattern(QSGGeometry::StaticPattern);

    if (parentNode == 0)
        parentNode = this;
    parentNode->appendChildNode(node);

    return node;
}

devel

I'm making a custom QQuickItem too. And it needs to accept a delegate that'll appear in the specific position.

So, is it the right solution to expose a QRect property and do a QML wrapper that creates and positions that sub-item with a Loader?

Or it's somehow possible to attach other items directly to one of QSGNode of a custom QQuickItem?

vladstelmahovsky

@Alexey the only way is to use QQuickText and use private classes