Qt flickering animation

[tomrider]

Hi Everyone,
I have a problem creating a simple animation with Qt animation.
I have a small image located at the bottom right corner of the screen, i am trying to create animation that will enlarge the picture by streching it from the the top left corner of the image and streching it to the center of the screen.
I managed to do that, but, it's very notiable that qanimation makes it flicker (the right border of the picture, and it doesn't turns out good)
I also did that with no animation, but with a timer, and changing window geometry , but i had the same problem, seems that it's not refreshing fast enough, creating flickering in the right border of the picture.

here are the 2 examples:
1 - using property animation (geometery)

animation = new QPropertyAnimation(this, "geometry");
        animation->setDuration(555);
        animation->setEasingCurve(QEasingCurve::Linear);
        animation->setStartValue(QRect(availableScreenSize.width()-minWidth-WINDOW_PADDING,availableScreenSize.height()-minHeight-WINDOW_PADDING,minWidth,minHeight));
        animation->setEndValue(QRect(availableScreenSize.width()-maxWidth-WINDOW_PADDING,availableScreenSize.height()-maxHeight-WINDOW_PADDING,maxWidth,maxHeight));

animation = new QPropertyAnimation(this, "geometry");
        animation->setDuration(555);
        animation->setEasingCurve(QEasingCurve::Linear);
        animation->setStartValue(QRect(availableScreenSize.width()-minWidth-WINDOW_PADDING,availableScreenSize.height()-minHeight-WINDOW_PADDING,minWidth,minHeight));
        animation->setEndValue(QRect(availableScreenSize.width()-maxWidth-WINDOW_PADDING,availableScreenSize.height()-maxHeight-WINDOW_PADDING,maxWidth,maxHeight));

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2 - using a timer

#include "widget.h"
#include "ui_widget.h"
#include <QDesktopWidget>
#include <QDebug>
 
Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setStyleSheet("background:transparent;");
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool);
 
    availableScreenSize = qApp->desktop()->availableGeometry();
 
    //Growing from right to left
    this->setGeometry(availableScreenSize.width()-165,availableScreenSize.height()-95,160,90);
    //Growing from left to right
    //this->setGeometry(200,200,160,90);
 
    timeLine = new QTimeLine();
    timeLine->setDuration(2222);
    timeLine->setFrameRange(1, 800);
    connect(timeLine, SIGNAL(frameChanged(int)), this, SLOT(update()));
 
    counter = 0;
 
    timeLine->start();
}
 
Widget::~Widget()
{
    delete ui;
}
 
void Widget::paintEvent(QPaintEvent * /* event */)
{
    counter++;
    qDebug() << counter;
 
    qApp->processEvents();
    //Growing from right to left
    this->setGeometry(availableScreenSize.width()-165-this->width()-1,availableScreenSize.height()-95-this->height()-1,this->width()+1,this->height()+1);
 
    //Growing from left to right
    //this->setGeometry(200,200,this->width()+1,this->height()+1);
 
    if(timeLine->currentFrame() == 800)
    {
        qApp->exit(1);
    }
}

#include "widget.h"
#include "ui_widget.h"
#include <QDesktopWidget>
#include <QDebug>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
    this->setStyleSheet("background:transparent;");
    this->setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint | Qt::Tool);

    availableScreenSize = qApp->desktop()->availableGeometry();

    //Growing from right to left
    this->setGeometry(availableScreenSize.width()-165,availableScreenSize.height()-95,160,90);
    //Growing from left to right
    //this->setGeometry(200,200,160,90);

    timeLine = new QTimeLine();
    timeLine->setDuration(2222);
    timeLine->setFrameRange(1, 800);
    connect(timeLine, SIGNAL(frameChanged(int)), this, SLOT(update()));

    counter = 0;

    timeLine->start();
}

Widget::~Widget()
{
    delete ui;
}

void Widget::paintEvent(QPaintEvent * /* event */)
{
    counter++;
    qDebug() << counter;

    qApp->processEvents();
    //Growing from right to left
    this->setGeometry(availableScreenSize.width()-165-this->width()-1,availableScreenSize.height()-95-this->height()-1,this->width()+1,this->height()+1);

    //Growing from left to right
    //this->setGeometry(200,200,this->width()+1,this->height()+1);

    if(timeLine->currentFrame() == 800)
    {
        qApp->exit(1);
    }
}

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Now the weired thing here is that if the animation is from left 2 right - it looks smooth... once the direction is changed from right 2 left the entire right border is "jumpy" .

I'll appriciate any help that you can give me.
Thanks!