Hi all,

I'd like to animate (show and hide) a widget when a toggle button is pressed.
I wrote this code:
Qt Code: 
  1. MainWindow::MainWindow
  2. {
  3.    [...]
  4.     //ui->widget->hide();//[1]
  5.     //ui->button->setChecked(false);//[2]
  6.    startgeometry = QRect(0,0,0,0);
  7.    connect(ui->button,SIGNAL(toggled(bool)),this,SLOT(togglePyShell(bool)));
  8. }
  9.  
  10. void MainWindow::togglePyShell(bool show)
  11. {
  12.     QRect formerGeometry = QRect(ui->widget->geometry());
  13.     if(startgeometry==QRect(0,0,0,0)){
  14.         startgeometry = formerGeometry;
  15.     }
  16.     if(show){
  17.         //ui->widget->show();//[3]
  18.         QPropertyAnimation *showAnimation = new QPropertyAnimation(ui->widget, "geometry");
  19.         showAnimation->setDuration(100); 
  20.         showAnimation->setEasingCurve(QEasingCurve::Linear);
  21.         showAnimation->setStartValue(formerGeometry);
  22.         showAnimation->setEndValue(startgeometry);
  23.         showAnimation->start(QPropertyAnimation::DeleteWhenStopped);
  24.     }else{
  25.         QPropertyAnimation *hideAnimation = new QPropertyAnimation(ui->widget, "geometry");
  26.         hideAnimation->setDuration(100); 
  27.         hideAnimation->setEasingCurve(QEasingCurve::Linear);
  28.         hideAnimation->setStartValue(formerGeometry);
  29.         QPoint endTopLeftCorner = QPoint(ui->widget->pos() + QPoint(0, ui->widget->height()));
  30.         QRect finalGeometry = QRect(endTopLeftCorner, QSize(ui->widget->width(), 0));
  31.         hideAnimation->setEndValue(finalGeometry);
  32.         hideAnimation->start(QPropertyAnimation::DeleteWhenStopped);
  33.         //ui->widget->hide();//[4]
  34.     }
  35. }
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It works if the widget is visible after costructor (and button pressed), but I'd like to start with the widget invisible (and button not checked).

I don't know how to hide the widget.
If i try to uncomment from [1] up to [4] or subset of them I have strange behaviour, because (i guess) I can't save original widget's size into startgeometry.

Any help is appreciated,
Thanks in advance.