Migrate the FlutterPubspecNotificationProvider to the new EditorNotificationProvider API

This is progress on flutter#7830

Author: jwren

flutter-idea/src/io/flutter/editor/FlutterPubspecNotificationProvider.java

@@ -6,12 +6,10 @@
 package io.flutter.editor;
 
 import com.intellij.openapi.fileEditor.FileEditor;
-import com.intellij.openapi.project.DumbAware;
 import com.intellij.openapi.project.Project;
-import com.intellij.openapi.util.Key;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.ui.EditorNotificationPanel;
-import com.intellij.ui.EditorNotifications;
+import com.intellij.ui.EditorNotificationProvider;
 import com.intellij.ui.HyperlinkLabel;
 import icons.FlutterIcons;
 import io.flutter.FlutterUtils;
@@ -23,24 +21,13 @@
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
+import java.util.function.Function;
 
-public class FlutterPubspecNotificationProvider extends EditorNotifications.Provider<EditorNotificationPanel> implements DumbAware {
-  private static final Key<EditorNotificationPanel> KEY = Key.create("flutter.pubspec");
-
-  public FlutterPubspecNotificationProvider(@NotNull Project project) {
-  }
-
-  @NotNull
-  @Override
-  public Key<EditorNotificationPanel> getKey() {
-    return KEY;
-  }
-
+public final class FlutterPubspecNotificationProvider implements EditorNotificationProvider {
   @Nullable
   @Override
-  public EditorNotificationPanel createNotificationPanel(@NotNull VirtualFile file,
-                                                         @NotNull FileEditor fileEditor,
-                                                         @NotNull Project project) {
+  public Function<? super @NotNull FileEditor, ? extends @Nullable JComponent> collectNotificationData(@NotNull Project project,
+                                                                                                       @NotNull VirtualFile file) {
     // We only show this notification inside of local pubspec files.
     if (!PubRoot.isPubspec(file) || !file.isInLocalFileSystem()) {
       return null;
@@ -57,22 +44,25 @@ public EditorNotificationPanel createNotificationPanel(@NotNull VirtualFile file
       return null;
     }
 
-    if (FlutterSdk.getFlutterSdk(project) == null) {
+    final FlutterSdk flutterSdk = FlutterSdk.getFlutterSdk(project);
+    if (flutterSdk == null) {
       return null;
     }
 
-    return new FlutterPubspecActionsPanel(project, file);
+    return fileEditor -> new FlutterPubspecActionsPanel(fileEditor, project, flutterSdk);
   }
 
   static class FlutterPubspecActionsPanel extends EditorNotificationPanel {
-    @NotNull final Project project;
     @NotNull final VirtualFile myFile;
+    @NotNull final Project myProject;
+    @NotNull final FlutterSdk myFlutterSdk;
 
-    FlutterPubspecActionsPanel(@NotNull Project project, @NotNull VirtualFile file) {
+    FlutterPubspecActionsPanel(@NotNull FileEditor fileEditor, @NotNull Project project, @NotNull FlutterSdk flutterSdk) {
       super(UIUtils.getEditorNotificationBackgroundColor());
 
-      this.project = project;
-      myFile = file;
+      myFile = fileEditor.getFile();
+      myProject = project;
+      myFlutterSdk = flutterSdk;
 
       icon(FlutterIcons.Flutter);
       text("Flutter commands");
@@ -86,44 +76,35 @@ static class FlutterPubspecActionsPanel extends EditorNotificationPanel {
       label.setToolTipText("Upgrade referenced packages to the latest versions");
 
       // If the SDK is the right version, add a 'flutter pub outdated' command.
-      final FlutterSdk sdk = FlutterSdk.getFlutterSdk(project);
-      if (sdk != null && sdk.getVersion().isPubOutdatedSupported()) {
+      if (myFlutterSdk.getVersion().isPubOutdatedSupported()) {
         // "flutter.pub.outdated"
         label = createActionLabel("Pub outdated", this::runPubOutdated);
         label.setToolTipText("Analyze packages to determine which ones can be upgraded");
       }
 
-      myLinksPanel.add(new JSeparator(SwingConstants.VERTICAL));
+      if (myLinksPanel != null) {
+        myLinksPanel.add(new JSeparator(SwingConstants.VERTICAL));
+      }
       label = createActionLabel("Flutter doctor", "flutter.doctor");
       label.setToolTipText("Validate installed tools and their versions");
     }
 
     private void runPubGet(boolean upgrade) {
-      final FlutterSdk sdk = FlutterSdk.getFlutterSdk(project);
-      if (sdk == null) {
-        return;
-      }
-
       final PubRoot root = PubRoot.forDirectory(myFile.getParent());
       if (root != null) {
         if (!upgrade) {
-          sdk.startPubGet(root, project);
+          myFlutterSdk.startPubGet(root, myProject);
         }
         else {
-          sdk.startPubUpgrade(root, project);
+          myFlutterSdk.startPubUpgrade(root, myProject);
         }
       }
     }
 
     private void runPubOutdated() {
-      final FlutterSdk sdk = FlutterSdk.getFlutterSdk(project);
-      if (sdk == null) {
-        return;
-      }
-
       final PubRoot root = PubRoot.forDirectory(myFile.getParent());
       if (root != null) {
-        sdk.startPubOutdated(root, project);
+        myFlutterSdk.startPubOutdated(root, myProject);
       }
     }
   }