How to create a separate instances of components contained in a plugin for every opened IntelliJ window?

Hi all,

im writing a plugin consisting of a tool window with a simple chat functionality. It contains an input area (ui.swing.TextField) and a JTextPane with the chat history. The problem that I'm facing is that regardless of the number of opened Intellij windows there is only one instance of each component created. Which means e.g. when I programatically insert something into the the input area in the second window, it gets inserted to the instance in the first window.

I assume this occurs because of the fact that tool windows get instantiated once for all the windows. Now I'm wondering what is the best way to solve the problem. I was considering using an <applicationListeners> which would determine whether a new window has been opened and if so create a new components accordingly. Is there maybe another solution that I've missed?

Thanks in advance.


Creating separate instances of components contained in a plugin for every opened IntelliJ window can be achieved by ensuring that each window operates independently with its own set of components. Here's a general approach:

Use Project Level Components: If your plugin components are intended to be project-specific (i.e., they operate on project-level data), then you should use project-level components. These components are scoped to each individual project opened in IntelliJ IDEA, ensuring that each window gets its own set of components.

Avoid Application-level Components: Components registered at the application level are shared across all windows and projects within IntelliJ IDEA. Therefore, you should avoid using application-level components if you want separate instances for each window.

Utilize ProjectService and ProjectComponent: If your plugin needs to maintain state or perform actions specific to each project, consider using ProjectService and ProjectComponent implementations. These allow you to manage project-specific resources and actions.

Handle Window Events: You may need to listen for window events to manage the lifecycle of your plugin components appropriately. For example, you can listen for window opening and closing events to create and destroy component instances as needed.

Consider Tool Windows: If your plugin provides tool windows or other UI elements, ensure that these are scoped appropriately to the project or window. You can use ToolWindowFactory to create project-specific tool windows.

Testing: Test your plugin in various scenarios where multiple windows are open to ensure that each window behaves independently and has its own set of components.


Thank you for your answer.