属性和 QGraphicsSimpleTextItem

Question

我想知道我们是否可以在继承 QGraphicsSimpleTextItem 的类中使用属​​性来制作动画？

我正在画这个按钮：

它是由：

• 一个圆，继承QGraphicsObject并覆盖几何属性

• 一个椭圆，基本相同，但以圆为父

• 一个文本，继承QObject和QGraphicsSimpleTextItem

对于前两个，动画有效。但关于最后一个，我有以下错误：

QPropertyAnimation: you're trying to animate a non-existing property localisation of your QObject
QPropertyAnimation: you're trying to animate a non-existing property localisation of your QObject
QPropertyAnimation: you're trying to animate a non-existing property sizePolicy of your QObject
QPropertyAnimation: you're trying to animate a non-existing property sizePolicy of your QObject

这是我的课程“MyText”：

class MyTextOk : public QObject, public QGraphicsSimpleTextItem
{
    Q_PROPERTY(QPointF localisation READ localisation WRITE setLocalisation)
    Q_PROPERTY(QFont sizePolicy READ sizePolicy WRITE setSizePolicy)
public:
    explicit MyTextOk(QGraphicsObject *parent = 0);
    ~MyTextOk();

    QPointF localisation() const;
    void setLocalisation(const QPointF &value);

    QFont sizePolicy() const;
    void setSizePolicy(const QFont &value);

private:
    QRectF boundingRect() const;

protected :
    QPointF point;
    QFont font;
};

还有我的 .ccp

QVariant myFontInterpolator(const QFont &start, const QFont &end, qreal progress)
{
    if (progress<0.5)
    {
        int a = (1-progress)*50 + progress*45;
        QFont rt(start);
        rt.setPointSize(a);
        return rt;
    }
    else
    {
        int a = (1-progress)*45 + progress*50;
        QFont rt(start);
        rt.setPointSize(a);
        return rt;
    }
        Q_UNUSED(end)
}

MyTextOk::MyTextOk(QGraphicsObject *parent)
    : QObject(parent), QGraphicsSimpleTextItem(parent)
{
    point = QPointF(-40,-45);
    this->setText("Ok");
    this->setPos(point);
    this->setBrush(QBrush(Qt::white));
    font = QFont("Colibri",50);
    this->setFont(font);

    qRegisterAnimationInterpolator<QFont>(myFontInterpolator);
}

MyTextOk::~MyTextOk()
{

}

QPointF MyTextOk::localisation() const
{
    return point;
}

void MyTextOk::setLocalisation(const QPointF &value)
{
    if(point!=value)
    {
        point = value;
        update();
    }
}

QFont MyTextOk::sizePolicy() const
{
    return font;
}

void MyTextOk::setSizePolicy(const QFont &value)
{
    if(font!=value)
    {
        font=value;
        update();
    }
}

QRectF MyTextOk::boundingRect() const
{
    return QRectF(0,0,0,0);
}

我在我的 MainWindow 中制作动画：

void MainWindow::lancerAnimBoutonRond()
{
    animationBoutonRondTaille = new QPropertyAnimation(roundButton, "geometry");

    animationBoutonRondTaille->setDuration(300);
    animationBoutonRondTaille->setKeyValueAt(0, QRectF(-90, -90, 180, 180));
    animationBoutonRondTaille->setKeyValueAt(0.5, QRectF(-85,-85,170,170));
    animationBoutonRondTaille->setKeyValueAt(1, QRectF(-90, -90, 180, 180));

    animationBoutonRondTaille -> start();

    animationBoutonRondEllipse = new QPropertyAnimation(whiteShadow, "geometry");

    animationBoutonRondEllipse->setDuration(300);
    animationBoutonRondEllipse->setKeyValueAt(0,QRectF(-70,-80,140,80));
    animationBoutonRondEllipse->setKeyValueAt(0.5,QRectF(-65,-75,130,90));
    animationBoutonRondEllipse->setKeyValueAt(1,QRectF(-70,-80,140,80));

    animationBoutonRondEllipse->start(); // These two work

    animationBoutonRondOk = new QPropertyAnimation(textOk,"localisation");

    animationBoutonRondOk->setDuration(300);
    animationBoutonRondOk->setKeyValueAt(0,QPointF(-40,-45));
    animationBoutonRondOk->setKeyValueAt(0.5,QPointF(-35, -40));
    animationBoutonRondOk->setKeyValueAt(1,QPointF(-40, -45));

    animationBoutonRondOk->start(); //error : QPropertyAnimation: you're trying to animate a non-existing property localisation of your QObject

    animationBoutonRondOkTaille = new QPropertyAnimation(textOk,"sizePolicy");

    animationBoutonRondOkTaille->setDuration(300);
    animationBoutonRondOkTaille->setStartValue(QFont("Colibri",50));
    animationBoutonRondOkTaille->setEndValue(QFont("Colibri",50));

    animationBoutonRondOkTaille->start();  //error : 'QPropertyAnimation: you're trying to animate a non-existing property sizePolicy of your QObject'

}

我不知道是否可以命名我的“自己的”属性，但我不能（？）覆盖font 和pos 属性，因为我继承了QGraphicsSimpleTextItem 并使用@ 987654330@和setPos()

如果你想尝试，你可以找到所有代码here。

感谢您的宝贵时间。

Answer 1

问题解决了。

MyTextOk 类定义中的Q_OBJECT 宏丢失。放置后，代码运行正常。

您可以找到我的按钮 here 的工作示例。