Works

max_opened_projects/src/main/java/org/intellij/sdk/maxOpenPrj/ProjectOpenCloseListener.java

@@ -3,13 +3,10 @@
 package org.intellij.sdk.maxOpenPrj;
 
 import com.intellij.openapi.Disposable;
-import com.intellij.openapi.actionSystem.CommonShortcuts;
 import com.intellij.openapi.components.ServiceManager;
-import com.intellij.openapi.project.DumbAwareAction;
 import com.intellij.openapi.project.Project;
 import com.intellij.openapi.project.ProjectManager;
 import com.intellij.openapi.project.ProjectManagerListener;
-import com.intellij.openapi.ui.Messages;
 import com.intellij.openapi.ui.popup.Balloon;
 import com.intellij.openapi.ui.popup.JBPopupFactory;
 import com.intellij.openapi.util.Disposer;
@@ -38,12 +35,9 @@ public class ProjectOpenCloseListener implements ProjectManagerListener, Disposa
     projectCountingService.incrProjectCount();
     // See if the total # of projects violates the limit.
     if (projectCountingService.projectLimitExceeded()) {
+      System.out.println("\n\nOpen limit transition called for: " + project.toString());
       // Transitioned to outside the limit
-//      Messages.showMessageDialog(
+      showBalloon("projectOpened", project, "Opening Project \"" + project.getName() + "\"", "The number of open projects exceeds the SDK plugin max_opened_projects limit.");
-//              "The number of open projects exceeds the SDK plugin max_opened_projects limit.",
-//              "Opening Project \"" + project.getName() + "\"",
-//              Messages.getErrorIcon());
-      showBalloon(project, "Opening Project \"" + project.getName() + "\"", "The number of open projects exceeds the SDK plugin max_opened_projects limit.");
     }
   }
 
@@ -62,44 +56,57 @@ public class ProjectOpenCloseListener implements ProjectManagerListener, Disposa
     projectCountingService.decrProjectCount();
     // See if the total # of projects no longer violates the limit.
     if (!projectCountingService.projectLimitExceeded() && previouslyOverCount) {
-      // Transitioned from above the limit to within the limit.
+      System.out.println("\n\nCLOSED limit transition called for: " + project.toString());
-//      Messages.showMessageDialog(
+      // Transitioned to within the limit.
-//              "The number of open projects does not exceed the SDK plugin max_opened_projects limit.",
+      showBalloon("projectClosed", project, "\"" + project.getName() + "\" Has Been Closed", "The number of open projects is below the SDK plugin max_opened_projects limit.");
-//              "\"" + project.getName() + "\" Has Been Closed",
-//              Messages.getErrorIcon());
-      showBalloon(project, "\"" + project.getName() + "\" Has Been Closed", "The number of open projects is below the SDK plugin max_opened_projects limit.");
     }
   }
 
+  /*
+  CLOSED limit transition called for: Project (name=testKotlin, containerState=DISPOSE_IN_PROGRESS, componentStore=/Users/jhake/Documents/source/scratch/testKotlin)
+  From: projectClosed - allProjects[2] = Project (name=conditional_operator_test, containerState=ACTIVE, componentStore=/Users/jhake/Documents/source/scratch/conditional_operator_test) , Open = true
+  From: projectClosed - allProjects[1] = Project (name=foobar, containerState=ACTIVE, componentStore=/Users/jhake/Documents/source/scratch/foobar) , Open = true
+  From: projectClosed - allProjects[0] = Project (name=SimpleTest, containerState=ACTIVE, componentStore=/Users/jhake/Documents/source/scratch/SimpleTest) , Open = true
+   */
+  private void showBalloon(String caller, Project project, String title, String message) {
+    // Ensure the project is open. If not, use the next youngest one in the project list
+    ProjectManager projectManager = ProjectManager.getInstance();
+    Project[] allProjects = projectManager.getOpenProjects();
+    Project validProject = allProjects[allProjects.length - 1];
+    if (validProject == null) {
+      return;
+    }
+    System.out.println(String.format("From: %s - validProject = %s", caller, validProject.toString()));
 
-  private void showBalloon(Project project, String title, String message) {
+    // Verify the place to put the balloon
+    final WindowManager manager = WindowManager.getInstance();
+    final JFrame frame = manager.getFrame(validProject);
+    JRootPane pane = frame.getRootPane();
+    if (pane == null) {
+      return;
+    }
+
+    // Construct and show the balloon
     JLabel component = new JLabel(message);
     final Balloon balloon = JBPopupFactory.getInstance().createBalloonBuilder(component)
             .setShadow(true)
             .setAnimationCycle(200)               // Was 0
             .setHideOnClickOutside(true)
-//            .setHideOnKeyOutside(true)
+            .setHideOnAction(false)
-            .setHideOnAction(true)                    // was false
             .setFillColor(UIUtil.getControlColor())
             .setTitle(title)                          // Added
             .setFadeoutTime(5000)                     // Added
             .createBalloon();
-//    DumbAwareAction.create(e -> balloon.hide())
+    Disposer.register(validProject, balloon);
-//            .registerCustomShortcutSet(CommonShortcuts.ESCAPE, component);
+    balloon.showInCenterOf(pane);
-    Disposer.register(project, balloon);
+
 //    final Balloon.Position position = QuickEditAction.getBalloonPosition(editor);
 //    RelativePoint point = JBPopupFactory.getInstance().guessBestPopupLocation(editor);
 //    if (position == Balloon.Position.above) {
 //      final Point p = point.getPoint();
 //      point = new RelativePoint(point.getComponent(), new Point(p.x, p.y - editor.getLineHeight()));
 //    }
-    ProjectManager PM = ProjectManager.getInstance();
+
-    Project[] AllProjects = PM.getOpenProjects();
-    Project prevProject = AllProjects[AllProjects.length - 1];
-    final WindowManager manager = WindowManager.getInstance();
-    final JFrame frame = prevProject != null ? manager.getFrame(prevProject) : manager.findVisibleFrame();
-    JRootPane pane = frame.getRootPane();
-    balloon.showInCenterOf(pane);
   }
 
   /**