diff options
Diffstat (limited to 'examples/webenginewidgets/printme/doc/src/printme.qdoc')
| -rw-r--r-- | examples/webenginewidgets/printme/doc/src/printme.qdoc | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/examples/webenginewidgets/printme/doc/src/printme.qdoc b/examples/webenginewidgets/printme/doc/src/printme.qdoc index cac69aa41..91aecf6de 100644 --- a/examples/webenginewidgets/printme/doc/src/printme.qdoc +++ b/examples/webenginewidgets/printme/doc/src/printme.qdoc @@ -55,9 +55,11 @@ Now we can implement the \c{PrintHandler::printDocument()} slot, which is called in response to the \l{QPrintPreviewDialog::paintRequested} signal. To do actual painting on a printer, we call the \l QWebEngineView::print() - function. Because this call is asynchronous, we need to use - a local event loop. We begin the local event loop by calling - \l{QEventLoop::exec()}. + function. Printing is an async operation in Chromium, but not in Qt, so we + run a local event loop using \l{QEventLoop::exec()} to make sure printing + is done before returning. User input is blocked, since clicking on a button + while we're waiting for the print to finish can mess up the internal state + and cause a crash. \quotefromfile webenginewidgets/printme/printhandler.cpp \skipto PrintHandler::printDocument( @@ -66,7 +68,8 @@ To get notified about the result of printing job, we implement \c{PrintHandler::printFinished()} slot as handler of \l QWebEngineView::printFinished() signal. We check for \c{success} and - report any errors that occurred. + report any errors that occurred. Finally, we call \l{QEventLoop::quit()} + to exit out of the local event loop. \quotefromfile webenginewidgets/printme/printhandler.cpp \skipto PrintHandler::printFinished( |