Make image bigger on enterEvent, maller on leaveEvent

[Globulus]

Hello!

I want QLabel, that contains image, make image bigger on enterEvent,
and smaller on leaveEvent. (animate it by QPropertyAnimation and QStateMachine ). For this purposes I subclassed QLabel, just like this:

class MyLabel : public QLabel
{
    Q_OBJECT
 
public:
    MyLabel(QWidget * parent = 0);
    ~MyLabel();
 
protected slots:
 
    virtual void enterEvent ( QEvent * event );
    virtual void leaveEvent ( QEvent * event );    
};
 
MyLabel::MyLabel(QWidget * parent) : QWidget(parent)
{
}
 
MyLabel::~MyLabel()
{
}
 
void MyLabel::enterEvent ( QEvent * event )
{
}
 
void MyLabel::leaveEvent ( QEvent * event )
{
}

class MyLabel : public QLabel
{
    Q_OBJECT
 
public:
    MyLabel(QWidget * parent = 0);
    ~MyLabel();
 
protected slots:
 
    virtual void enterEvent ( QEvent * event );
    virtual void leaveEvent ( QEvent * event );    
};
 
MyLabel::MyLabel(QWidget * parent) : QWidget(parent)
{
}
 
MyLabel::~MyLabel()
{
}
 
void MyLabel::enterEvent ( QEvent * event )
{
}
 
void MyLabel::leaveEvent ( QEvent * event )
{
}

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But what next - have no idea...

Tried something like :

void MyLabel::enterEvent ( QEvent * event )
{
 
 QPropertyAnimation *animation = new QPropertyAnimation(this, "geometry");
 animation->setDuration(600);
animation->setStartValue(QRect(this->geometry().x(), this->geometry().y(), 64, 64));
 animation->setEndValue(QRect(this->geometry().x(), this->geometry().y(), 128, 128));
animation->start();
}

void MyLabel::enterEvent ( QEvent * event )
{

 QPropertyAnimation *animation = new QPropertyAnimation(this, "geometry");
 animation->setDuration(600);
animation->setStartValue(QRect(this->geometry().x(), this->geometry().y(), 64, 64));
 animation->setEndValue(QRect(this->geometry().x(), this->geometry().y(), 128, 128));
animation->start();
}

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But that is not the idea, because this->geometry().x() returns 0....

[qlands]

Hi,

Try by adding the constructor

this->setScaledContents(true);

this->setScaledContents(true);

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Also, do work with x and y because this is the position of the object in its parent and usually is 0,0

So you can:

void mylabel::enterEvent(QEvent *)
{
    QPropertyAnimation *animation = new QPropertyAnimation(this, "geometry");
     animation->setDuration(600);
     animation->setStartValue(this->rect()); //Get the curren rectangle
     QRect final;
     final = this->rect(); //The final is = the current 
     final.setWidth(final.width()*4); //Make it bigger
     final.setHeight(final.height()*4); //Make it bigger
 
     animation->setEndValue(final); //Set the final
     animation->start();
}

void mylabel::enterEvent(QEvent *)
{
    QPropertyAnimation *animation = new QPropertyAnimation(this, "geometry");
     animation->setDuration(600);
     animation->setStartValue(this->rect()); //Get the curren rectangle
     QRect final;
     final = this->rect(); //The final is = the current 
     final.setWidth(final.width()*4); //Make it bigger
     final.setHeight(final.height()*4); //Make it bigger

     animation->setEndValue(final); //Set the final
     animation->start();
}

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Hope this helps.
Carlos

[Globulus]

Thanks, Carlos, for your help,but something is wrong...

qDebug() << this->rect();

Debug out is :

QRect(0,0 101x101) //one time enterEvent
QRect(0,0 242x242) //second time enterEvent

QRect(0,0 101x101) //one time enterEvent
QRect(0,0 242x242) //second time enterEvent

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It seems that, your code really made image bigger but,
position of the QLabel in its parent is 0,0.

So now, I need to get QLabel position on mainwindow from my MyLabel class.

Any ideas, I will be very grateful!

[qlands]

Yes, is re-sizes the label from 0,0, with it (top,left) where paint usually starts.

From what you said, the second time the rect is bigger that the first time... Did you make it smaller in the mouseLeave()?

If you want to re-size the image in the way that it looks as its blowing from the center, you may need to implement you own animation with a QTimer or QVariantAnimation and work out the position of the object in terms of x and Y when the object changes its size.

[Globulus]

If you want to re-size the image in the way that it looks as its blowing from the center, you may need to implement you own animation with a QTimer or QVariantAnimation and work out the position of the object in terms of x and Y when the object changes its size.

Yes, that's exactly what I want...