From 219383657a4eaf967401984858ebb5c8efa5822d Mon Sep 17 00:00:00 2001 From: Itay Grudev Date: Tue, 9 Jun 2015 17:29:20 +0300 Subject: QApplication inherit macro --- README.md | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'README.md') diff --git a/README.md b/README.md index 31e1b86..7003edb 100644 --- a/README.md +++ b/README.md @@ -32,6 +32,24 @@ The ```Show Up``` signal ------------------------ The SingleApplication class implements a ```showUp()``` signal. You can bind to that signal to raise your application's window when a new instance had been started. +Note that since ```SingleApplication``` extends the ```QApplication``` class you can do the following: +```cpp +QObject::connect(QApplication::instance(), SIGNAL(showUp()), window, SLOT(raise())); // window is your QWindow instance +``` + +Using ```QApplication::instance()``` is a neat way to get the ```SingleApplication``` instance at any place in your program. + +Extending from other application classes +----------------------- + +```SingleApplication``` extends from the ```QApplication``` class by default , but you can easily change that to ```QGuiApplication``` or ```QCoreApplication``` from the ```singleapplication.h``` file, using the ```QAPPLICATION_CLASS``` macro. + +__Example:__ + +```cpp +#define QAPPLICATION_CLASS QCoreApplication +``` + Implementation -------------- The library is implemented with a QSharedMemory block which is thread safe and guarantees a race condition will not occur. It also uses a QLocalSocket to notify the main process that a new instance had been spawned and thus invoke the ```showUp()``` signal. -- cgit v1.2.1