通过按下控制台窗口上的按钮删除创建的进度条

Question

我试图学习自己使用QT，所以仍在挣扎很多...如何通过按删除按钮来删除弹跳对象？我正在努力实施删除功能...

MainWindow::MainWindow(QWidget * parent): QMainWindow(parent) {

  setFixedSize(800, 600);
  int start;

  timer  = new QTimer(this);
  connect(timer , SIGNAL(timeout()), this, SLOT(step()));

  timer  -> setInterval(5);
  timer  -> start();

  QPushButton * sillyLabel  = new QPushButton(this);
  connect(sillyLabel , SIGNAL(clicked()), this, SLOT(doSomethingSilly()));

  sillyLabel  -> setText("Spawn Object");
  sillyLabel  -> setGeometry(400, 400, 200, 50);


  QPushButton * dLabel  = new QPushButton(this);
  connect(dLabel , SIGNAL(clicked()), this, SLOT(deleteSomethingSilly()));

  dLabel  -> setText("Delete Object");
  dLabel  -> setGeometry(200, 200, 200, 50);

MainWindow::~MainWindow() {

}

void MainWindow::doSomethingSilly() {
  QProgressBar * sillyobject = new QProgressBar(this);

  sillyobject -> setGeometry(400, 300, 80, 50);
  sillyobject -> show();
  sillyobject -> setValue(100);

  bouncyobject.push_back(sillyobject);

}

void MainWindow::deleteSomethingSilly() {


delete ?;

}

Answer 1

您必须将sillyobject在类标题内声明为私人指针（要在所有类成员内部访问），那么您只需删除指针以：

 delete sillyobject;

在您的标题文件中：

 (...)
 private :
 QProgressBar * sillyobject 
 (...)

然后

void MainWindow::doSomethingSilly() {
   sillyobject = new QProgressBar(this);

  sillyobject -> setGeometry(400, 300, 80, 50);
  sillyobject -> show();
  sillyobject -> setValue(100);

  bouncyobject.push_back(sillyobject);

}

：然后：

void MainWindow::deleteSomethingSilly() {


delete sillyobject;

}