Added action which disables Kotlin signatures icons.

idea/src/META-INF/plugin.xml

@@ -63,7 +63,10 @@
          <add-to-group group-id="CodeMenu" anchor="last"/>
      </action>
 
-
+     <group id="EditorGutterKotlinPopupMenu">
+       <action id="ShowKotlinSignatures" class="org.jetbrains.jet.plugin.codeInsight.ShowKotlinSignaturesAction"/>
+       <add-to-group group-id="EditorGutterPopupMenu" anchor="last" />
+     </group>
   </actions>
 
   <extensions defaultExtensionNs="com.intellij">

idea/src/org/jetbrains/jet/plugin/codeInsight/KotlinSignatureInJavaMarkerProvider.java

@@ -17,11 +17,14 @@
 package org.jetbrains.jet.plugin.codeInsight;
 
 import com.intellij.codeHighlighting.Pass;
+import com.intellij.codeInsight.daemon.DaemonCodeAnalyzer;
 import com.intellij.codeInsight.daemon.GutterIconNavigationHandler;
 import com.intellij.codeInsight.daemon.LineMarkerInfo;
 import com.intellij.codeInsight.daemon.LineMarkerProvider;
 import com.intellij.codeInsight.navigation.NavigationUtil;
+import com.intellij.ide.util.PropertiesComponent;
 import com.intellij.openapi.fileEditor.OpenFileDescriptor;
+import com.intellij.openapi.project.Project;
 import com.intellij.openapi.vfs.VirtualFile;
 import com.intellij.psi.*;
 import com.intellij.util.Function;
@@ -40,6 +43,8 @@ import java.util.List;
  * @since 3 August 2012
  */
 public class KotlinSignatureInJavaMarkerProvider implements LineMarkerProvider {
+    private static final String SHOW_MARKERS_PROPERTY = "kotlin.signature.markers.enabled";
+
     private static final Function<PsiElement,String> TOOLTIP_PROVIDER = new Function<PsiElement, String>() {
         @Override
         public String fun(PsiElement element) {
@@ -112,7 +117,7 @@ public class KotlinSignatureInJavaMarkerProvider implements LineMarkerProvider {
     @Override
     @Nullable
     public LineMarkerInfo getLineMarkerInfo(@NotNull PsiElement element) {
-        if (findKotlinSignatureAnnotation(element) != null) {
+        if (isMarkersEnabled(element.getProject()) && findKotlinSignatureAnnotation(element) != null) {
             return new LineMarkerInfo<PsiMethod>((PsiMethod) element, element.getTextOffset(), JetIcons.SMALL_LOGO, Pass.UPDATE_ALL,
                                                  TOOLTIP_PROVIDER, NAVIGATION_HANDLER);
         }
@@ -122,4 +127,13 @@ public class KotlinSignatureInJavaMarkerProvider implements LineMarkerProvider {
     @Override
     public void collectSlowLineMarkers(@NotNull List<PsiElement> elements, @NotNull Collection<LineMarkerInfo> result) {
     }
+
+    public static boolean isMarkersEnabled(@NotNull Project project) {
+        return PropertiesComponent.getInstance(project).getBoolean(SHOW_MARKERS_PROPERTY, true);
+    }
+
+    public static void setMarkersEnabled(@NotNull Project project, boolean value) {
+        PropertiesComponent.getInstance(project).setValue(SHOW_MARKERS_PROPERTY, Boolean.toString(value));
+        DaemonCodeAnalyzer.getInstance(project).restart();
+    }
 }

idea/src/org/jetbrains/jet/plugin/codeInsight/ShowKotlinSignaturesAction.java

@@ -0,0 +1,53 @@
+/*
+ * Copyright 2010-2012 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.jet.plugin.codeInsight;
+
+import com.intellij.lang.java.JavaLanguage;
+import com.intellij.openapi.actionSystem.AnActionEvent;
+import com.intellij.openapi.actionSystem.LangDataKeys;
+import com.intellij.openapi.actionSystem.ToggleAction;
+import com.intellij.openapi.project.Project;
+import com.intellij.psi.PsiFile;
+
+public class ShowKotlinSignaturesAction extends ToggleAction {
+    public ShowKotlinSignaturesAction() {
+        super("Show Kotlin Signatures");
+    }
+
+    @Override
+    public boolean isSelected(AnActionEvent e) {
+        Project project = e.getProject();
+        return project != null && KotlinSignatureInJavaMarkerProvider.isMarkersEnabled(project);
+    }
+
+    @Override
+    public void update(AnActionEvent e) {
+        super.update(e);
+        e.getPresentation().setVisible(false);
+        PsiFile psiFile = e.getData(LangDataKeys.PSI_FILE);
+        if (psiFile != null && psiFile.getLanguage() == JavaLanguage.INSTANCE) {
+            e.getPresentation().setVisible(true);
+        }
+    }
+
+    @Override
+    public void setSelected(AnActionEvent e, boolean state) {
+        Project project = e.getProject();
+        assert project != null;
+        KotlinSignatureInJavaMarkerProvider.setMarkersEnabled(project, state);
+    }
+}