Hide for old versions and add icons

Author: helin24

resources/META-INF/plugin.xml

@@ -333,7 +333,7 @@
     <toolWindow id="Flutter Widget Previewer"
                 anchor="right"
                 factoryClass="io.flutter.widgetpreviewer.WidgetPreviewerToolWindowFactory"
-                icon="FlutterIcons.Flutter" />
+                icon="FlutterIcons.WidgetPreviewer" />
     <!-- Having the projectService defined after the toolWindows allows them to all be picked up by the platform -->
     <!-- See https://github.com/flutter/flutter-intellij/issues/8029 -->
     <projectService serviceImplementation="io.flutter.view.InspectorView" overrides="false"/>

resources/icons/expui/widgetPreviewer.svg

@@ -9,6 +9,7 @@ private static Icon load(String path) {
     return IconLoader.getIcon(path, FlutterIcons.class);
   }
 
+  public static final Icon WidgetPreviewer = load("/icons/expui/widgetPreviewer.svg");
   public static final Icon DevToolsDeepLinks = load("/icons/expui/deepLinks.svg");
   public static final Icon DevTools = load("/icons/expui/devTools.svg");
   public static final Icon DevToolsExtensions = load("/icons/expui/extensions.svg");

resources/icons/expui/widgetPreviewer_dark.svg

@@ -62,6 +62,7 @@ public final class FlutterSdkVersion implements Comparable<FlutterSdkVersion> {
 
   @NotNull
   public static final FlutterSdkVersion MIN_SUPPORTS_WIDGET_PREVIEWER = new FlutterSdkVersion("3.37.0");
+  //public static final FlutterSdkVersion MIN_SUPPORTS_WIDGET_PREVIEWER = new FlutterSdkVersion("3.39.0");
 
   @NotNull
   public static final String UNKNOWN_VERSION = "unknown version";

src/icons/FlutterIcons.java

@@ -5,6 +5,8 @@
 import com.intellij.openapi.wm.ToolWindowFactory;
 import com.intellij.ui.content.Content;
 import com.intellij.ui.content.ContentFactory;
+import io.flutter.sdk.FlutterSdk;
+import kotlin.coroutines.Continuation;
 import org.jetbrains.annotations.NotNull;
 
 public class WidgetPreviewerToolWindowFactory implements ToolWindowFactory {
@@ -17,4 +19,16 @@ public void createToolWindowContent(@NotNull Project project, @NotNull ToolWindo
     Content content = contentFactory.createContent(widgetPreviewerPanel, "", false);
     toolWindow.getContentManager().addContent(content);
   }
+
+  @Override
+  public Object isApplicableAsync(@NotNull Project project, @NotNull Continuation<? super Boolean> $completion) {
+    // If we know for sure the Flutter SDK version is too old, we won't show options to open this tool window.
+    FlutterSdk sdk = FlutterSdk.getFlutterSdk(project);
+    if (sdk != null && !sdk.getVersion().canUseWidgetPreviewer()) {
+      return false;
+    }
+
+    // For other cases, let the panel handle SDK version issues (e.g. missing SDK version).
+    return true;
+  }
 }