Add preference dependency to gesture input related options

Bug: 8613600
Change-Id: I279d3264080aede59203205c45763c7f8ff08ae6

java/res/xml/prefs.xml

@@ -93,12 +93,14 @@
         <!-- TODO: Move these two options to the advanced settings. -->
         <CheckBoxPreference
             android:key="pref_gesture_floating_preview_text"
+            android:dependency="gesture_input"
             android:title="@string/gesture_floating_preview_text"
             android:summary="@string/gesture_floating_preview_text_summary"
             android:persistent="true"
             android:defaultValue="true" />
         <CheckBoxPreference
             android:key="pref_gesture_preview_trail"
+            android:dependency="gesture_input"
             android:title="@string/gesture_preview_trail"
             android:persistent="true"
             android:defaultValue="true" />

java/src/com/android/inputmethod/latin/SettingsFragment.java

@@ -232,10 +232,6 @@ public final class SettingsFragment extends InputMethodSettingsFragment
         } else if (key.equals(Settings.PREF_SHOW_LANGUAGE_SWITCH_KEY)) {
             setPreferenceEnabled(Settings.PREF_INCLUDE_OTHER_IMES_IN_LANGUAGE_SWITCH_LIST,
                     Settings.readShowsLanguageSwitchKey(prefs));
-        } else if (key.equals(Settings.PREF_GESTURE_INPUT)) {
-            final boolean gestureInputEnabled = Settings.readGestureInputEnabled(prefs, res);
-            setPreferenceEnabled(Settings.PREF_GESTURE_PREVIEW_TRAIL, gestureInputEnabled);
-            setPreferenceEnabled(Settings.PREF_GESTURE_FLOATING_PREVIEW_TEXT, gestureInputEnabled);
         } else if (key.equals(Settings.PREF_SHOW_SETUP_WIZARD_ICON)) {
             LauncherIconVisibilityManager.updateSetupWizardIconVisibility(getActivity());
         }