[fenix] For https://github.com/mozilla-mobile/fenix/issues/2477 - Adds accessibility setting to force enable zoom

app/src/main/java/org/mozilla/fenix/FeatureFlags.kt

@@ -54,4 +54,6 @@ object FeatureFlags {
      * Allows Progressive Web Apps to be installed to the device home screen.
      */
     val progressiveWebApps = nightly or debug
+
+    val forceZoomPreference = nightly or debug
 }

app/src/main/java/org/mozilla/fenix/settings/AccessibilityFragment.kt

@@ -8,6 +8,7 @@ import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import androidx.preference.PreferenceFragmentCompat
 import androidx.preference.SwitchPreference
+import org.mozilla.fenix.FeatureFlags
 import org.mozilla.fenix.R
 import org.mozilla.fenix.ext.components
 import org.mozilla.fenix.ext.getPreferenceKey
@@ -25,6 +26,23 @@ class AccessibilityFragment : PreferenceFragmentCompat() {
         (activity as AppCompatActivity).title = getString(R.string.preferences_accessibility)
         (activity as AppCompatActivity).supportActionBar?.show()
 
+        val forceZoomPreference = findPreference<SwitchPreference>(
+            getPreferenceKey(R.string.pref_key_accessibility_force_enable_zoom)
+        )
+        forceZoomPreference?.isVisible = FeatureFlags.forceZoomPreference
+
+        if (FeatureFlags.forceZoomPreference) {
+            forceZoomPreference?.setOnPreferenceChangeListener<Boolean> { preference, shouldForce ->
+                val settings = preference.context.settings()
+                val components = preference.context.components
+
+                settings.forceEnableZoom = shouldForce
+                components.core.engine.settings.forceUserScalableContent = shouldForce
+
+                true
+            }
+        }
+
         val textSizePreference = findPreference<TextPercentageSeekBarPreference>(
             getPreferenceKey(R.string.pref_key_accessibility_font_scale)
         )

app/src/main/java/org/mozilla/fenix/utils/Settings.kt

@@ -77,6 +77,11 @@ class Settings private constructor(
     override val preferences: SharedPreferences =
         appContext.getSharedPreferences(FENIX_PREFERENCES, MODE_PRIVATE)
 
+    var forceEnableZoom by booleanPreference(
+        appContext.getPreferenceKey(R.string.pref_key_accessibility_force_enable_zoom),
+        default = false
+    )
+
     var adjustCampaignId by stringPreference(
         appContext.getPreferenceKey(R.string.pref_key_adjust_campaign),
         default = ""

app/src/main/res/values/preference_keys.xml

@@ -12,6 +12,7 @@
     <string name="pref_key_accessibility" translatable="false">pref_key_accessibility</string>
     <string name="pref_key_accessibility_auto_size" translatable="false">pref_key_accessibility_auto_size</string>
     <string name="pref_key_accessibility_font_scale" translatable="false">pref_key_accessibility_font_scale</string>
+    <string name="pref_key_accessibility_force_enable_zoom" translatable="false">pref_key_accessibility_force_enable_zoom</string>
     <string name="pref_key_language" translatable="false">pref_key_language</string>
     <string name="pref_key_data_choices" translatable="false">pref_key_data_choices</string>
     <string name="pref_key_privacy_link" translatable="false">pref_key_privacy_link</string>

app/src/main/res/values/static_strings.xml

@@ -24,4 +24,10 @@
 
     <!--suppress CheckTagEmptyBody This is a default value for places where we don't want a string set-->
     <string name="empty_string" translatable="false"></string>
+
+
+    <!-- Title for Accessibility Force Enable Zoom Preference -->
+    <string name="preference_accessibility_force_enable_zoom" translatable="false">Zoom on all websites</string>
+    <!-- Summary for Accessibility Force Enable Zoom Preference -->
+    <string name="preference_accessibility_force_enable_zoom_summary" translatable="false">Enable to allow pinch and zoom, even on websites that prevent this gesture.</string>
 </resources>

app/src/main/res/xml/accessibility_preferences.xml

@@ -24,4 +24,12 @@
         app:min="0"
         app:seekBarIncrement="1"
         app:showSeekBarValue="true" />
+    <SwitchPreference
+        android:defaultValue="false"
+        android:key="@string/pref_key_accessibility_force_enable_zoom"
+        android:summary="@string/preference_accessibility_force_enable_zoom_summary"
+        android:title="@string/preference_accessibility_force_enable_zoom"
+        app:isPreferenceVisible="false"
+        app:allowDividerAbove="true"
+        app:iconSpaceReserved="false" />
 </PreferenceScreen>