CapturesToolWindow.java 文件源码

@Override
public void hierarchyChanged(HierarchyEvent hierarchyEvent) {
  if ((hierarchyEvent.getChangeFlags() & HierarchyEvent.SHOWING_CHANGED) != 0) {
    // We only want to listen to VFS_CHANGES events when the tool window is opened.
    if (myTree.isShowing()) {
      if (myConnection == null) {
        myConnection = myProject.getMessageBus().connect(myProject);
        myConnection.subscribe(VirtualFileManager.VFS_CHANGES, this);
      }
    }
    else {
      if (myConnection != null) {
        myConnection.disconnect();
        myConnection = null;
      }
    }
  }
}