Display shortcut modifiers in menu

Prepend relevant meta key names (such as Ctrl+) to the shortcut
displayed in a menu.

Do not prepend "Menu+" if the device does not have a hardware Menu key.

Bug: 31045453
Test: run ApiDemos (MenuInflateFromXml), select "Shortcuts", observe
  Ctrl+ prepended to shortcuts.

Change-Id: I1a38bd1baf069dd1adb24a26f89c6db6390b8b8d
(cherry picked from commit 0cc2c6b190695ef78029c7b05a175fb3bb7e4098)

3 files changed, 56 insertions, 25 deletions

diff --git a/core/java/com/android/internal/view/menu/MenuItemImpl.java b/core/java/com/android/internal/view/menu/MenuItemImpl.java
index 9d012de33089..0c5ea6327dff 100644
--- a/core/java/com/android/internal/view/menu/MenuItemImpl.java
+++ b/core/java/com/android/internal/view/menu/MenuItemImpl.java
@@ -23,6 +23,7 @@ import android.content.ActivityNotFoundException;
 import android.content.Context;
 import android.content.Intent;
 import android.content.res.ColorStateList;
+import android.content.res.Resources;
 import android.graphics.PorterDuff;
 import android.graphics.drawable.Drawable;
 import android.util.Log;
@@ -33,6 +34,7 @@ import android.view.LayoutInflater;
 import android.view.MenuItem;
 import android.view.SubMenu;
 import android.view.View;
+import android.view.ViewConfiguration;
 import android.view.ViewDebug;
 import android.widget.LinearLayout;
 
@@ -108,13 +110,6 @@ public final class MenuItemImpl implements MenuItem {
     private CharSequence mContentDescription;
     private CharSequence mTooltipText;
 
-    private static String sLanguage;
-    private static String sPrependShortcutLabel;
-    private static String sEnterShortcutLabel;
-    private static String sDeleteShortcutLabel;
-    private static String sSpaceShortcutLabel;
-
-
     /**
      * Instantiates this menu item.
      *
@@ -130,20 +125,6 @@ public final class MenuItemImpl implements MenuItem {
     MenuItemImpl(MenuBuilder menu, int group, int id, int categoryOrder, int ordering,
             CharSequence title, int showAsAction) {
 
-        String lang = menu.getContext().getResources().getConfiguration().locale.toString();
-        if (sPrependShortcutLabel == null || !lang.equals(sLanguage)) {
-            sLanguage = lang;
-            // This is instantiated from the UI thread, so no chance of sync issues
-            sPrependShortcutLabel = menu.getContext().getResources().getString(
-                    com.android.internal.R.string.prepend_shortcut_label);
-            sEnterShortcutLabel = menu.getContext().getResources().getString(
-                    com.android.internal.R.string.menu_enter_shortcut_label);
-            sDeleteShortcutLabel = menu.getContext().getResources().getString(
-                    com.android.internal.R.string.menu_delete_shortcut_label);
-            sSpaceShortcutLabel = menu.getContext().getResources().getString(
-                    com.android.internal.R.string.menu_space_shortcut_label);
-        }
-
         mMenu = menu;
         mId = id;
         mGroup = group;
@@ -353,19 +334,45 @@ public final class MenuItemImpl implements MenuItem {
             return "";
         }
 
-        StringBuilder sb = new StringBuilder(sPrependShortcutLabel);
+        final Resources res = mMenu.getContext().getResources();
+
+        StringBuilder sb = new StringBuilder();
+        if (ViewConfiguration.get(mMenu.getContext()).hasPermanentMenuKey()) {
+            // Only prepend "Menu+" if there is a hardware menu key.
+            sb.append(res.getString(
+                com.android.internal.R.string.prepend_shortcut_label));
+        }
+
+        final int modifiers =
+            mMenu.isQwertyMode() ? mShortcutAlphabeticModifiers : mShortcutNumericModifiers;
+        appendModifier(sb, modifiers, KeyEvent.META_META_ON, res.getString(
+            com.android.internal.R.string.menu_meta_shortcut_label));
+        appendModifier(sb, modifiers, KeyEvent.META_CTRL_ON, res.getString(
+            com.android.internal.R.string.menu_ctrl_shortcut_label));
+        appendModifier(sb, modifiers, KeyEvent.META_ALT_ON, res.getString(
+            com.android.internal.R.string.menu_alt_shortcut_label));
+        appendModifier(sb, modifiers, KeyEvent.META_SHIFT_ON, res.getString(
+            com.android.internal.R.string.menu_shift_shortcut_label));
+        appendModifier(sb, modifiers, KeyEvent.META_SYM_ON, res.getString(
+            com.android.internal.R.string.menu_sym_shortcut_label));
+        appendModifier(sb, modifiers, KeyEvent.META_FUNCTION_ON, res.getString(
+            com.android.internal.R.string.menu_function_shortcut_label));
+
         switch (shortcut) {
 
             case '\n':
-                sb.append(sEnterShortcutLabel);
+                sb.append(res.getString(
+                    com.android.internal.R.string.menu_enter_shortcut_label));
                 break;
 
             case '\b':
-                sb.append(sDeleteShortcutLabel);
+                sb.append(res.getString(
+                    com.android.internal.R.string.menu_delete_shortcut_label));
                 break;
 
             case ' ':
-                sb.append(sSpaceShortcutLabel);
+                sb.append(res.getString(
+                    com.android.internal.R.string.menu_space_shortcut_label));
                 break;
 
             default:
@@ -376,6 +383,12 @@ public final class MenuItemImpl implements MenuItem {
         return sb.toString();
     }
 
+    private static void appendModifier(StringBuilder sb, int mask, int modifier, String label) {
+        if ((mask & modifier) == modifier) {
+            sb.append(label);
+        }
+    }
+
     /**
      * @return Whether this menu item should be showing shortcuts (depends on
      *         whether the menu should show shortcuts and whether this item has
diff --git a/core/res/res/values/strings.xml b/core/res/res/values/strings.xml
index dc937e63c11e..20cc44d55b6f 100644
--- a/core/res/res/values/strings.xml
+++ b/core/res/res/values/strings.xml
@@ -2447,6 +2447,18 @@
     <string name="more_item_label">More</string>
     <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the MENU button together with the shortcut to invoke the item. For example, if the shortcut to open a new tab in browser is MENU and B together, then this would be prepended to the letter "B" -->
     <string name="prepend_shortcut_label">Menu+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the META key together with the shortcut to invoke the item. -->
+    <string name="menu_meta_shortcut_label">Meta+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the CTRL key together with the shortcut to invoke the item. -->
+    <string name="menu_ctrl_shortcut_label">Ctrl+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the ALT key together with the shortcut to invoke the item. -->
+    <string name="menu_alt_shortcut_label">Alt+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the SHIFT key together with the shortcut to invoke the item. -->
+    <string name="menu_shift_shortcut_label">Shift+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the SYM key together with the shortcut to invoke the item. -->
+    <string name="menu_sym_shortcut_label">Sym+</string>
+    <!-- Prepended to the shortcut for a menu item to indicate that the user should hold the FUNCTION key together with the shortcut to invoke the item. -->
+    <string name="menu_function_shortcut_label">Function+</string>
     <!-- Displayed in place of the regular shortcut letter when a menu item has Menu+space for the shortcut. -->
     <string name="menu_space_shortcut_label">space</string>
     <!-- Displayed in place of the regular shortcut letter when a menu item has Menu+enter for the shortcut. -->
diff --git a/core/res/res/values/symbols.xml b/core/res/res/values/symbols.xml
index 97116f54e7c9..30193a81d778 100644
--- a/core/res/res/values/symbols.xml
+++ b/core/res/res/values/symbols.xml
@@ -528,9 +528,15 @@
   <java-symbol type="string" name="delete" />
   <java-symbol type="string" name="deleteText" />
   <java-symbol type="string" name="grant_permissions_header_text" />
+  <java-symbol type="string" name="menu_alt_shortcut_label" />
+  <java-symbol type="string" name="menu_ctrl_shortcut_label" />
   <java-symbol type="string" name="menu_delete_shortcut_label" />
   <java-symbol type="string" name="menu_enter_shortcut_label" />
+  <java-symbol type="string" name="menu_function_shortcut_label" />
+  <java-symbol type="string" name="menu_meta_shortcut_label" />
   <java-symbol type="string" name="menu_space_shortcut_label" />
+  <java-symbol type="string" name="menu_shift_shortcut_label" />
+  <java-symbol type="string" name="menu_sym_shortcut_label" />
   <java-symbol type="string" name="notification_title" />
   <java-symbol type="string" name="permission_request_notification_with_subtitle" />
   <java-symbol type="string" name="prepend_shortcut_label" />