如何抓取指向Qt中弹出对话框的指针，该对话框阻止了QTest中的UI线程

How to grab pointer to popup dialog in Qt which blocks the UI thread in QTest

本文关键字：对话框 QTest 线程 UI 中的 取指 何抓 Qt 指针      更新时间：2023-10-16

我正在使用QTest编写一个集成测试，其中一旦我单击小部件的视口，就会出现一个多行弹出的QInputDialog，它阻止了代码的进一步执行，需要手动取消对话框。这是代码：

void PartTest::testTypewriterAnnotTool()
{
Okular::Part part(nullptr, nullptr, QVariantList()); // It is the main widget of PDF reader comprising of viewport where PDF page is shown
part.openUrl(QUrl::fromLocalFile(QStringLiteral(KDESRCDIR "data/file1.pdf"))); // open file1.pdf
part.widget()->show();
QVERIFY(QTest::qWaitForWindowExposed(part.widget()));
// Width and height of pageView widget, the child of Part widget which shows the PDF page
const int width = part.m_pageView->horizontalScrollBar()->maximum() +
part.m_pageView->viewport()->width();
const int height = part.m_pageView->verticalScrollBar()->maximum() +
part.m_pageView->viewport()->height();
part.m_document->setViewportPage(0); // sets viewport page 0, i.e. page number 1
QMetaObject::invokeMethod(part.m_pageView, "slotToggleAnnotator", Q_ARG( bool, true )); // toggles and shows the annotation toolbar with all tools avaialable
QList<QToolButton *> toolbuttonList = part.m_pageView->findChildren<QToolButton *>(); // find a list of annotation toolbutton
// Check if the tooltip of 10th button is "Typewriter"
QToolButton* typewriterButton = toolbuttonList.at(9);
QCOMPARE( typewriterButton->toolTip(), QStringLiteral("Typewriter") );
typewriterButton->click(); // clicking and selecting typewriter annotation tool
QTest::mouseMove(part.m_pageView->viewport(), QPoint(width * 0.5, height * 0.2)); // leading mouse pointer to a specific point in the viewport
QTest::mouseClick(part.m_pageView->viewport(), Qt::LeftButton, Qt::NoModifier, QPoint(width * 0.5, height * 0.2)); // mouse left button click on the viewport and a popup dialog with 'add a new note' appears
}

我必须编写一个测试用例，在其中我必须抓住该弹出对话框并以编程方式关闭它。我正在尝试通过使用 QTimer 来实现这一点，我将在其中执行一个函数，在视口中单击 1 秒后抓取对话框，然后尝试像这样关闭它：

class PartTest
{
...
private:
Okular::part *m_part;
}
void PartTest::testTypewriterAnnotTool()
{
...
m_part = &part;
QTimer* mTimer = new QTimer(this);
mTimer->setSingleShot(true);
connect(mTimer, SIGNAL(timeout()), SLOT(testDialogClosed()));
mTimer->start(1000);
QTest::mouseClick(part.m_pageView->viewport(), Qt::LeftButton, Qt::NoModifier, QPoint(width * 0.5, height * 0.2));
}
void PartTest::testDialogClosed()
{
bool m_clicked = false;
QDialog *dialog = m_part->widget()->findChild<QDialog*>();
if (dialog)
{
QDialogButtonBox *buttonBox = dialog->findChild<QDialogButtonBox*>();
buttonBox->button(QDialogButtonBox::Cancel)->click();
m_clicked = true;
}
QVERIFY(m_clicked);
}

在这里，QVERIFY(m_clicked)测试用例总是"失败"，这意味着弹出窗口QInputDialog is not the child of Okular::Part，我没有办法抓取指向此对话框窗口的指针并关闭它。有什么帮助吗？

您可以枚举顶级小部件并通过以下方式找到对话框：

template <class P> QList<P> topLevelWidgets() {
QList<P> widgets
for (auto *w : QApplication::topLevelWidgets())
if (auto *t = qobject_cast<P>(w))
widgets << t;
return widgets;
}
template <class P> P topLevelWidget() {
auto w = topLevelWidgets<P>();
return (w.size() == 1) ? w.first() : nullptr;
}
void PartTest::testDialogClosed()
{
bool m_clicked = false;
if (auto *dialog = topLevelWidget<QDialog*>())
if (auto *buttonBox = dialog->findChild<QDialogButtonBox*>()) {
buttonBox->button(QDialogButtonBox::Cancel)->click();
m_clicked = true;
}
QVERIFY(m_clicked);
}
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