Method setNeedsDisplay

snap_drawing/src/snap_drawing/cpp/Layers/Layer.cpp:595–608

}

void Layer::setNeedsDisplay() {
    if (_isDrawing) {
        return;
    }

    if (!_needsDisplay) {
        _needsDisplay = true;

        _cachedForeground.clear();
        _cachedContent.clear();

        setChildNeedsDisplay();
    }
}

bool Layer::needsDisplay() const {
    return _needsDisplay;