For #5509 - Show the toolbar and floating buttons when a11y services …

…are enabled

app/src/main/java/org/mozilla/focus/browser/DisplayToolbar.kt

@@ -7,7 +7,12 @@ package org.mozilla.focus.browser
 import android.content.Context
 import android.util.AttributeSet
 import com.google.android.material.appbar.AppBarLayout
-import kotlinx.android.synthetic.main.browser_display_toolbar.view.*
+import com.google.android.material.appbar.AppBarLayout.LayoutParams.SCROLL_FLAG_ENTER_ALWAYS
+import com.google.android.material.appbar.AppBarLayout.LayoutParams.SCROLL_FLAG_SCROLL
+import com.google.android.material.appbar.AppBarLayout.LayoutParams.SCROLL_FLAG_SNAP
+import kotlinx.android.synthetic.main.browser_display_toolbar.view.browserToolbar
+import kotlinx.android.synthetic.main.browser_display_toolbar.view.urlbar
+import org.mozilla.focus.utils.Settings
 
 /**
  * The toolbar of the BrowserFragment; displaying the URL and other controls.
@@ -16,12 +21,23 @@ class DisplayToolbar(
     context: Context,
     attrs: AttributeSet
 ) : AppBarLayout(context, attrs), AppBarLayout.OnOffsetChangedListener {
+
     init {
         addOnOffsetChangedListener(this)
     }
 
     @Suppress("MagicNumber") // A mathematical expression - No need to add constants for 100% and 50%.
     override fun onOffsetChanged(appBarLayout: AppBarLayout, verticalOffset: Int) {
+
+        if (Settings.getInstance(context).isAccessibilityEnabled()) {
+            (urlbar.layoutParams as LayoutParams).scrollFlags = LayoutParams.SCROLL_FLAG_NO_SCROLL
+            browserToolbar.alpha = 1f
+            return
+        } else {
+            (urlbar.layoutParams as LayoutParams).scrollFlags =
+                SCROLL_FLAG_SCROLL or SCROLL_FLAG_ENTER_ALWAYS or SCROLL_FLAG_SNAP
+        }
+
         // When scrolling the toolbar away we want to fade out the content on the toolbar
         // with an alpha animation. This will avoid that the text clashes with the status bar.
 

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

@@ -4,9 +4,11 @@
 
 package org.mozilla.focus.utils
 
+import android.accessibilityservice.AccessibilityServiceInfo
 import android.content.Context
 import android.content.SharedPreferences
 import android.content.res.Resources
+import android.view.accessibility.AccessibilityManager
 import androidx.preference.PreferenceManager
 import mozilla.components.concept.engine.Engine
 import mozilla.components.concept.engine.EngineSession
@@ -18,7 +20,7 @@ import org.mozilla.focus.searchsuggestions.SearchSuggestionsPreferences
 /**
  * A simple wrapper for SharedPreferences that makes reading preference a little bit easier.
  */
-@Suppress("TooManyFunctions") // This class is designed to have a lot of (simple) functions
+@Suppress("TooManyFunctions", "LargeClass") // This class is designed to have a lot of (simple) functions
 class Settings private constructor(
     private val context: Context
 ) {
@@ -35,6 +37,26 @@ class Settings private constructor(
         }
     }
 
+    private val accessibilityManager =
+        context.getSystemService(Context.ACCESSIBILITY_SERVICE) as AccessibilityManager?
+
+    /**
+     * Check each active accessibility service to see if it can perform gestures, if any can,
+     * then it is *likely* a switch service is enabled.
+     */
+    private val switchServiceIsEnabled: Boolean
+        get() {
+            accessibilityManager?.getEnabledAccessibilityServiceList(0)?.let { activeServices ->
+                for (service in activeServices) {
+                    if (service.capabilities.and(AccessibilityServiceInfo.CAPABILITY_CAN_PERFORM_GESTURES) == 1) {
+                        return true
+                    }
+                }
+            }
+
+            return false
+        }
+
     private val preferencesListener = EngineSharedPreferencesListener(context)
 
     private val preferences: SharedPreferences = PreferenceManager.getDefaultSharedPreferences(context).apply {
@@ -210,6 +232,12 @@ class Settings private constructor(
             false
         )
 
+    /**
+     * This is automatically inferred based on the current system status. Not a setting in our app.
+     */
+    fun isAccessibilityEnabled() =
+        accessibilityManager?.isTouchExplorationEnabled ?: false || switchServiceIsEnabled
+
     fun userHasToggledSearchSuggestions(): Boolean =
         preferences.getBoolean(SearchSuggestionsPreferences.TOGGLED_SUGGESTIONS_PREF, false)
 

app/src/main/java/org/mozilla/focus/widget/FloatingActionButtonBehavior.java

@@ -14,6 +14,8 @@
 import android.util.AttributeSet;
 import android.view.View;
 
+import org.mozilla.focus.utils.Settings;
+
 /**
  * A Behavior implementation that will hide/show a FloatingActionButton based on whether an AppBarLayout
  * is visible or not.
@@ -58,7 +60,7 @@ public void onDependentViewRemoved(CoordinatorLayout parent, FloatingActionButto
 
     @Override
     public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
-        if (verticalOffset == 0 && !visible) {
+        if ((verticalOffset == 0 && !visible) || Settings.getInstance(appBarLayout.getContext()).isAccessibilityEnabled()) {
             showButton();
         } else if (Math.abs(verticalOffset) >= appBarLayout.getTotalScrollRange() && visible) {
             hideButton();

app/src/main/java/org/mozilla/focus/widget/FloatingEraseButton.java

@@ -9,7 +9,6 @@
 import com.google.android.material.floatingactionbutton.FloatingActionButton;
 import android.util.AttributeSet;
 import android.view.View;
-import android.view.accessibility.AccessibilityManager;
 import android.view.animation.AnimationUtils;
 
 import org.mozilla.focus.R;
@@ -32,17 +31,11 @@ public FloatingEraseButton(Context context, AttributeSet attrs, int defStyleAttr
     public void updateSessionsCount(int tabCount) {
         final CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) getLayoutParams();
         final FloatingActionButtonBehavior behavior = (FloatingActionButtonBehavior) params.getBehavior();
-        AccessibilityManager accessibilityManager = (AccessibilityManager) getContext().getSystemService(Context.ACCESSIBILITY_SERVICE);
 
         keepHidden = tabCount != 1;
 
         if (behavior != null) {
-            if (accessibilityManager != null && accessibilityManager.isTouchExplorationEnabled()) {
-                // Always display erase button if Talk Back is enabled
-                behavior.setAutoHideEnabled(false);
-            } else {
-                behavior.setAutoHideEnabled(!keepHidden);
-            }
+            behavior.setAutoHideEnabled(!keepHidden);
         }
 
         if (keepHidden) {

app/src/main/java/org/mozilla/focus/widget/FloatingSessionsButton.java

@@ -70,13 +70,7 @@ public void updateSessionsCount(int tabCount) {
             if (behavior != null) {
                 behavior.setAutoHideEnabled(shouldBeVisible);
             }
-
-            if (shouldBeVisible) {
-                show();
-                invalidate();
-            } else {
-                hide();
-            }
+            invalidate();
         }
     }