[Parameter Name Hints] added language combobox

platform/lang-impl/src/com/intellij/codeInsight/hints/settings/ParameterNameHintsConfigurable.form

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <form xmlns="http://www.intellij.com/uidesigner/form/" version="1" bind-to-class="com.intellij.codeInsight.hints.settings.ParameterNameHintsConfigurable">
-  <grid id="27dc6" binding="myConfigurable" layout-manager="GridLayoutManager" row-count="3" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+  <grid id="27dc6" binding="myConfigurable" layout-manager="GridLayoutManager" row-count="4" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
     <margin top="0" left="0" bottom="0" right="0"/>
     <constraints>
       <xy x="20" y="20" width="2069" height="400"/>
@@ -11,7 +11,7 @@
       <grid id="dda71" layout-manager="GridLayoutManager" row-count="1" column-count="1" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
         <margin top="0" left="0" bottom="0" right="0"/>
         <constraints>
-          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+          <grid row="2" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
         </constraints>
         <properties/>
         <border type="none"/>
@@ -54,9 +54,38 @@
       </grid>
       <vspacer id="ca768">
         <constraints>
-          <grid row="2" column="0" row-span="1" col-span="1" vsize-policy="6" hsize-policy="1" anchor="0" fill="2" indent="0" use-parent-layout="false"/>
+          <grid row="3" column="0" row-span="1" col-span="1" vsize-policy="6" hsize-policy="1" anchor="0" fill="2" indent="0" use-parent-layout="false"/>
         </constraints>
       </vspacer>
+      <grid id="8ca84" layout-manager="GridLayoutManager" row-count="1" column-count="3" same-size-horizontally="false" same-size-vertically="false" hgap="-1" vgap="-1">
+        <margin top="0" left="0" bottom="0" right="0"/>
+        <constraints>
+          <grid row="1" column="0" row-span="1" col-span="1" vsize-policy="3" hsize-policy="3" anchor="0" fill="3" indent="0" use-parent-layout="false"/>
+        </constraints>
+        <properties/>
+        <border type="none"/>
+        <children>
+          <component id="4be87" class="com.intellij.ui.components.JBLabel">
+            <constraints>
+              <grid row="0" column="0" row-span="1" col-span="1" vsize-policy="0" hsize-policy="0" anchor="0" fill="0" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties>
+              <text value="Language:"/>
+            </properties>
+          </component>
+          <hspacer id="5eb47">
+            <constraints>
+              <grid row="0" column="2" row-span="1" col-span="1" vsize-policy="1" hsize-policy="6" anchor="0" fill="1" indent="0" use-parent-layout="false"/>
+            </constraints>
+          </hspacer>
+          <component id="6747b" class="com.intellij.openapi.ui.ComboBox" binding="myCurrentLanguageCombo" custom-create="true">
+            <constraints>
+              <grid row="0" column="1" row-span="1" col-span="1" vsize-policy="0" hsize-policy="2" anchor="0" fill="0" indent="0" use-parent-layout="false"/>
+            </constraints>
+            <properties/>
+          </component>
+        </children>
+      </grid>
     </children>
   </grid>
 </form>

platform/lang-impl/src/com/intellij/codeInsight/hints/settings/ParameterNameHintsConfigurable.java

@@ -15,6 +15,7 @@
  */
 package com.intellij.codeInsight.hints.settings;
 
+import com.intellij.codeInsight.hints.InlayParameterHintsExtension;
 import com.intellij.codeInsight.hints.filtering.MatcherConstructor;
 import com.intellij.lang.Language;
 import com.intellij.openapi.editor.Document;
@@ -23,15 +24,20 @@ import com.intellij.openapi.editor.event.DocumentAdapter;
 import com.intellij.openapi.editor.event.DocumentEvent;
 import com.intellij.openapi.fileTypes.FileTypes;
 import com.intellij.openapi.project.Project;
+import com.intellij.openapi.ui.ComboBox;
 import com.intellij.openapi.ui.DialogWrapper;
 import com.intellij.openapi.util.TextRange;
 import com.intellij.openapi.util.text.StringUtil;
 import com.intellij.ui.EditorTextField;
+import com.intellij.ui.ListCellRendererWrapper;
+import com.intellij.util.containers.JBIterable;
+import org.jdesktop.swingx.combobox.ListComboBoxModel;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import javax.swing.*;
 import java.awt.*;
+import java.util.Collection;
 import java.util.List;
 import java.util.Set;
 import java.util.stream.Collectors;
@@ -39,6 +45,7 @@ import java.util.stream.Collectors;
 public class ParameterNameHintsConfigurable extends DialogWrapper {
   public JPanel myConfigurable;
   private EditorTextField myEditorTextField;
+  private ComboBox<Language> myCurrentLanguageCombo;
 
   private final Set<String> myDefaultBlackList;
   private final Language myLanguage;
@@ -107,6 +114,19 @@ public class ParameterNameHintsConfigurable extends DialogWrapper {
         updateOkEnabled();
       }
     });
+    
+    Collection<Language> allLanguages = Language.getRegisteredLanguages();
+    JBIterable<Language> languagesWithHintsSupport = JBIterable.from(allLanguages)
+      .filter((lang) -> !InlayParameterHintsExtension.INSTANCE.forKey(lang).isEmpty());
+
+    ListComboBoxModel<Language> model = new ListComboBoxModel<>(languagesWithHintsSupport.toList());
+    myCurrentLanguageCombo = new ComboBox<>(model);
+    myCurrentLanguageCombo.setRenderer(new ListCellRendererWrapper<Language>() {
+      @Override
+      public void customize(JList list, Language value, int index, boolean selected, boolean hasFocus) {
+        setText(value.getDisplayName());
+      }
+    });
   }
 
   private EditorTextField createEditor(@NotNull Set<String> blacklist, @Nullable String newPreselectedItem) {