Animation in Label[SOLVED]

[felipe.c.sousa]

I want do a animation for one label up. I use Qanimation but i have some problems when the text is to grow.

[messi]

This is not an explanation of your problem. No details, no answer.

[felipe.c.sousa]

@void Principal::up()
{
QDesktopWidget *desktop = new QDesktopWidget();
QPropertyAnimation *animation = new QPropertyAnimation(ui->lbTexto, "geometry");
animation->setDuration(18000);
animation->setStartValue(QRect(0, this->height(), this->width(), ui->lbTexto->height()));
animation->setEndValue(QRect(0, 0 - centralWidget()->height(), this->width(), ui->lbTexto->height()));
animation->setEasingCurve(QEasingCurve::Linear);
animation->setLoopCount(1);
connect(animation,SIGNAL(finished()),this,SLOT(down()));
animation->start();

}

void Principal::down()
{
QPropertyAnimation *animation = new QPropertyAnimation(ui->lbTexto, "geometry");
animation->setDuration(10);
animation->setStartValue(QRect(0, 0, this->width(), ui->lbTexto->height()));
animation->setEndValue(QRect(0, this->height(), this->width(), ui->lbTexto->height()));
animation->setLoopCount(1);
connect(animation,SIGNAL(finished()),this,SLOT(up()));
animation->start();
}@

i want something like "marquee" in HTML. But that do not work.

[messi]

Can you tell us what is not working?
Compile problem, runtime problem, visual problem, ....

I can give at least this advise. Create a member QPropertyAnimation mAnimation;
Initialize it in the constructor once.
Use then the memberfunction mAnimation->setDirection() to set the animation direction to move it up or down.

You also created an endless loop between up and down

in the down function
animation->setDuration(10);
The animation is set to 10ms. I would suggest 1000 or the same value as up().

setLoopCount(1); is not necessary to call because by default it is 1.

[felipe.c.sousa]

i have visual problems, because i can not do a flux to up and down, with the time they go upper then the first time.

[messi]

Here I wrote you a 5min solution for you. It is not running that smoth because of QPropertyAnimation. I personally would use QTimeLine and QWidget::move() because with QTimeLine you can set you the Duration and the UpdateIntervall.

@#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

class QLabel;
class QPushButton;
class QPropertyAnimation;

class Widget : public QWidget
{
Q_OBJECT

public:
explicit Widget(QWidget *parent = 0);
~Widget();

public slots:
void startStopAnimaiton();
void changeDirection();

private:
QLabel* mMovingLabel;
QPushButton* mStartButton;
QPropertyAnimation* mMoveAnimation;
};

#endif // WIDGET_H@

@#include <QLabel>
#include <QPropertyAnimation>
#include <QPushButton>
#include <QRect>
#include "Widget.h"

Widget::Widget(QWidget *parent) :
QWidget(parent)
{
mStartButton = new QPushButton(this);
mStartButton->setText("Start");

mMovingLabel = new QLabel;
mMovingLabel->setText("Moving down");
mMovingLabel->move(400, 100);
mMovingLabel->show();

mMoveAnimation = new QPropertyAnimation(mMovingLabel, "geometry");
mMoveAnimation->setDuration(5000);
mMoveAnimation->setStartValue( QRect( QPoint(400, 100), mMovingLabel->size()) );
mMoveAnimation->setEndValue( QRect( QPoint(400, 800), mMovingLabel->size()) );

connect( mStartButton, SIGNAL(clicked()), this, SLOT(startStopAnimaiton()) );
connect( mMoveAnimation, SIGNAL(finished()), this, SLOT(changeDirection()) );

}

Widget::~Widget()
{

}

void Widget::startStopAnimaiton()
{
if( mMoveAnimation->state() == QVariantAnimation::Running)
{
mMoveAnimation->stop();
mStartButton->setText("Start");
}
else
{
mMoveAnimation->start();
mStartButton->setText("Stop");
}
}

void Widget::changeDirection()
{
if( mMoveAnimation->direction() == QVariantAnimation::Forward)
{
mMoveAnimation->setDirection(QVariantAnimation::Backward);
mMovingLabel->setText("Moving up");
}
else
{
mMoveAnimation->setDirection(QVariantAnimation::Forward);
mMovingLabel->setText("Moving down");
}

mMoveAnimation->start();
}@

[felipe.c.sousa]

Oh, i dont know the "QVariantAnimation::Backward" i can do, change the endvalue relanting the value with the size of my widget. thanks