How to reuse the window (or close the current one) when hitting the Run button?-CodePudding

The

CodePudding user response：

If you are looking for an application focused way, that is also portable beyond intelij you could implement a "single instance approach" behaviour implementing your app as a single instance application, that closes the previous version.

As soon as the application starts it tries to open a specific, perhaps configurable, listening socket. Now there are two possibilities. Either the application manages to open the socket, or it does not manage to open the socket.

If the application manages to open the socket, the application continues normally. This is currently the only application instance that is running, and it is actually the first one started. (1st time you start the application). The application should listen to this socket and expect for a MAGIC_WORD. When the application receives the MAGIC_WORD from the socket, it should close all resources , close the socket and shutdown gracefully.

If the application does not manage to open the listening socket, then we assume that this port is already opened by a previous instance of the application, that is already running. In this case the newly started application connects to the open socket and sends a the MAGIC_WORD to the socked opened by the previous application instance and waits for the socket to be closed. At this time the newer application instance should continue by opening any potentially shared resources and then continues normally.

It would be better if instead of a socket a websocket is used and the shutdown of the first application is confirmed with a handshake.

PS: There are many different approaches to create a single instance application.