如何设置Qt QStateMachine动画时长

Question

我正在尝试学习Qt框架。我的QStateMachine代码做了正确的事情(按下按钮可以改变聊天窗口弹出窗口的大小)。我不能改变动画的速度来获得一个很好的视觉过渡。有什么建议吗？

代码如下：

MainWindow::MainWindow()
{
   widget.setupUi( this );

   // chat window - Chat button opens
   ChatWindowClosedState = new QState();
   ChatWindowOpenState = new QState();

   ChatWindowOpenGeometry = widget.groupBox->geometry();
   ChatWindowClosedGeometry = widget.pushButton->geometry();
   ChatWindowClosedGeometry.translate( -ChatWindowClosedGeometry.width(), 0 );

   ChatWindowClosedState->assignProperty( widget.groupBox, "geometry", ChatWindowClosedGeometry );
   ChatWindowOpenState->assignProperty( widget.groupBox, "geometry", ChatWindowOpenGeometry );

   ChatWindowCloseTransition = ChatWindowClosedState->addTransition( widget.pushButton, SIGNAL( clicked() ), ChatWindowOpenState );
   ChatWindowCloseAnimation = new QPropertyAnimation( widget.pushButton, "geometry" );
   ChatWindowCloseAnimation->setDuration( 5000 );
   ChatWindowCloseTransition->addAnimation( ChatWindowCloseAnimation );

   ChatWindowOpenTransition = ChatWindowOpenState->addTransition( widget.pushButton, SIGNAL( clicked() ), ChatWindowClosedState );
   ChatWindowOpenAnimation = new QPropertyAnimation( widget.pushButton, "geometry" );
   ChatWindowOpenAnimation->setDuration( 5000 );
   ChatWindowOpenTransition->addAnimation( ChatWindowOpenAnimation );

   machine = new QStateMachine( this );
   machine->addState( ChatWindowClosedState );
   machine->addState( ChatWindowOpenState );
   machine->setInitialState( ChatWindowClosedState );
   machine->start();
}

Answer 1

代码

ChatWindowOpenAnimation = new QPropertyAnimation( widget.pushButton, "geometry" );

应该是

ChatWindowOpenAnimation = new QPropertyAnimation( widget.groupBox, "geometry" );

动画应用到了错误的小部件。