c++ - QMessageBox使用快捷键多次打开

Question

我将 QMesssageBox 与 CTRL + N 快捷键内联(这意味着将打开新文件)。当我在对象动画时按住快捷键时。这是 Linux 的 UI 问题吗，因为我使用的是 Linux 操作系统，然后我在其他操作系统中尝试，但它没有发生，或者我忘记了任何代码？谢谢。

Answer 1

如果您的目标是一次最多出现一个 QMessageBox，您可以通过以下方式确保在代码中:

static QMessageBox * openMBox = NULL;

void MyClass :: showMessageBox()
{
   if (openMBox) return;  // don't open a new QMessageBox if we already have one open!

   openMBox = new QMessageBox(args here...);
   connect(openMBox, SIGNAL(buttonClicked(QAbstractButton*)), this, SLOT(userClickedButton(QAbstractButton*)));
   openMBox->show();
}

void MyClass :: userClickedButton(QAbstractButton * button)
{
   if (openMBox)
   {
      // [code to handle button-click result could go here]

      openMBox->deleteLater();
      openMBox = NULL;
   }
}

请注意，如果 openMBox 为 NULL(也就是说，仅当尚不存在消息框时)，showMessageBox() 才会实际创建一个新的 QMessageBox。

(The code calls deleteLater() in the userClickedButton() method instead of using the delete operator because it's likely that the userClickedButton() method is itself being called from within a method of the QMessageBox object, therefore we don't want to delete the QMessageBox object until later when it's not in the middle of a method-call)