[fenix] For https://github.com/mozilla-mobile/fenix/issues/6940: Fixes top dynamic toolbar behavior (https://github.com/mozilla-mobile/fenix/pull/9900)

app/src/main/java/org/mozilla/fenix/browser/BaseBrowserFragment.kt

@@ -19,7 +19,6 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.activityViewModels
 import androidx.lifecycle.lifecycleScope
 import androidx.navigation.fragment.findNavController
-import com.google.android.material.appbar.AppBarLayout
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.synthetic.main.fragment_browser.*
 import kotlinx.android.synthetic.main.fragment_browser.view.*
@@ -77,6 +76,7 @@ import org.mozilla.fenix.components.toolbar.BrowserInteractor
 import org.mozilla.fenix.components.toolbar.BrowserToolbarView
 import org.mozilla.fenix.components.toolbar.BrowserToolbarViewInteractor
 import org.mozilla.fenix.components.toolbar.DefaultBrowserToolbarController
+import org.mozilla.fenix.components.toolbar.SwipeRefreshScrollingViewBehavior
 import org.mozilla.fenix.components.toolbar.ToolbarIntegration
 import org.mozilla.fenix.downloads.DownloadNotificationBottomSheetDialog
 import org.mozilla.fenix.downloads.DownloadService
@@ -175,8 +175,6 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
 
         val toolbarHeight = resources.getDimensionPixelSize(R.dimen.browser_toolbar_height)
 
-        initializeEngineView(toolbarHeight)
-
         browserAnimator = BrowserAnimator(
             fragment = WeakReference(this),
             engineView = WeakReference(engineView),
@@ -510,6 +508,8 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
                     view = view
                 )
             }
+
+            initializeEngineView(toolbarHeight)
         }
     }
 
@@ -520,7 +520,7 @@ abstract class BaseBrowserFragment : Fragment(), UserInteractionHandler, Session
             val behavior = if (requireContext().settings().shouldUseBottomToolbar) {
                 EngineViewBottomBehavior(context, null)
             } else {
-                AppBarLayout.ScrollingViewBehavior(context, null)
+                SwipeRefreshScrollingViewBehavior(requireContext(), null, engineView, browserToolbarView)
             }
 
             (swipeRefresh.layoutParams as CoordinatorLayout.LayoutParams).behavior = behavior

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -23,7 +23,6 @@ import mozilla.components.feature.session.TrackingProtectionUseCases
 import mozilla.components.feature.sitepermissions.SitePermissions
 import mozilla.components.feature.tab.collections.TabCollection
 import mozilla.components.feature.tabs.WindowFeature
-import mozilla.components.lib.state.ext.consumeFrom
 import mozilla.components.support.base.feature.UserInteractionHandler
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
 import org.mozilla.fenix.FeatureFlags
@@ -103,10 +102,6 @@ class BrowserFragment : BaseBrowserFragment(), UserInteractionHandler {
                 owner = this,
                 view = view
             )
-
-            consumeFrom(browserFragmentStore) {
-                browserToolbarView.update(it)
-            }
         }
     }
 

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserInteractor.kt

@@ -31,4 +31,8 @@ open class BrowserInteractor(
     override fun onBrowserMenuDismissed(lowPrioHighlightItems: List<ToolbarMenu.Item>) {
         browserToolbarController.handleBrowserMenuDismissed(lowPrioHighlightItems)
     }
+
+    override fun onScrolled(offset: Int) {
+        browserToolbarController.handleScroll(offset)
+    }
 }

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarController.kt

@@ -48,6 +48,7 @@ import org.mozilla.fenix.utils.Do
  * An interface that handles the view manipulation of the BrowserToolbar, triggered by the Interactor
  */
 interface BrowserToolbarController {
+    fun handleScroll(offset: Int)
     fun handleToolbarPaste(text: String)
     fun handleToolbarPasteAndGo(text: String)
     fun handleToolbarItemInteraction(item: ToolbarMenu.Item)
@@ -139,6 +140,10 @@ class DefaultBrowserToolbarController(
         }
     }
 
+    override fun handleScroll(offset: Int) {
+        engineView.setVerticalClipping(offset)
+    }
+
     @ExperimentalCoroutinesApi
     @SuppressWarnings("ComplexMethod", "LongMethod")
     override fun handleToolbarItemInteraction(item: ToolbarMenu.Item) {

app/src/main/java/org/mozilla/fenix/components/toolbar/BrowserToolbarView.kt

@@ -23,6 +23,7 @@ import com.google.android.material.appbar.AppBarLayout.LayoutParams.SCROLL_FLAG_
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.android.extensions.LayoutContainer
 import kotlinx.android.synthetic.main.browser_toolbar_popup_window.view.*
+import kotlinx.android.synthetic.main.component_browser_top_toolbar.*
 import kotlinx.android.synthetic.main.component_browser_top_toolbar.view.*
 import mozilla.components.browser.domains.autocomplete.ShippedDomainsProvider
 import mozilla.components.browser.session.Session
@@ -48,6 +49,7 @@ interface BrowserToolbarViewInteractor {
     fun onBrowserToolbarMenuItemTapped(item: ToolbarMenu.Item)
     fun onTabCounterClicked()
     fun onBrowserMenuDismissed(lowPrioHighlightItems: List<ToolbarMenu.Item>)
+    fun onScrolled(offset: Int)
 }
 
 class BrowserToolbarView(
@@ -140,8 +142,17 @@ class BrowserToolbarView(
         with(container.context) {
             val sessionManager = components.core.sessionManager
 
+            if (!shouldUseBottomToolbar) {
+                val offsetChangedListener =
+                    AppBarLayout.OnOffsetChangedListener { _: AppBarLayout?, verticalOffset: Int ->
+                        interactor.onScrolled(verticalOffset)
+                    }
+
+                app_bar.addOnOffsetChangedListener(offsetChangedListener)
+            }
+
             view.apply {
-                setScrollFlagsForTopToolbar()
+                setScrollFlags()
 
                 elevation = TOOLBAR_ELEVATION.dpToFloat(resources.displayMetrics)
 
@@ -241,11 +252,6 @@ class BrowserToolbarView(
         }
     }
 
-    @Suppress("UNUSED_PARAMETER")
-    fun update(state: BrowserFragmentState) {
-        // Intentionally leaving this as a stub for now since we don't actually want to update currently
-    }
-
     fun expand() {
         if (settings.shouldUseBottomToolbar && FeatureFlags.dynamicBottomToolbar) {
             (view.layoutParams as CoordinatorLayout.LayoutParams).apply {
@@ -256,33 +262,38 @@ class BrowserToolbarView(
         }
     }
 
-    companion object {
+    /**
-        private const val TOOLBAR_ELEVATION = 16
-    }
-}
-
-/**
      * Dynamically sets scroll flags for the toolbar when the user does not have a screen reader enabled
      * Note that the bottom toolbar has a feature flag for being dynamic, so it may not get flags set.
      */
-fun BrowserToolbar.setScrollFlagsForTopToolbar() {
+    fun setScrollFlags(shouldDisableScroll: Boolean = false) {
-    // Don't set scroll flags for bottom toolbar
+        if (view.context.settings().shouldUseBottomToolbar) {
-    if (context.settings().shouldUseBottomToolbar) {
+            if (FeatureFlags.dynamicBottomToolbar && view.layoutParams is CoordinatorLayout.LayoutParams) {
-        if (FeatureFlags.dynamicBottomToolbar && layoutParams is CoordinatorLayout.LayoutParams) {
+                (view.layoutParams as CoordinatorLayout.LayoutParams).apply {
-            (layoutParams as CoordinatorLayout.LayoutParams).apply {
+                    behavior = BrowserToolbarBottomBehavior(view.context, null)
-                behavior = BrowserToolbarBottomBehavior(context, null)
                 }
             }
 
             return
         }
 
-    val params = layoutParams as AppBarLayout.LayoutParams
+        val params = view.layoutParams as AppBarLayout.LayoutParams
-    params.scrollFlags = when (context.settings().shouldUseFixedTopToolbar) {
+
-        true -> 0
+        params.scrollFlags = when (view.context.settings().shouldUseFixedTopToolbar || shouldDisableScroll) {
-        false -> {
+            true -> {
-            SCROLL_FLAG_SCROLL or SCROLL_FLAG_ENTER_ALWAYS or SCROLL_FLAG_SNAP or
+                // Force expand the toolbar so the user is not stuck with a hidden toolbar
-                SCROLL_FLAG_EXIT_UNTIL_COLLAPSED
+                expand()
+                0
             }
+            false -> {
+                SCROLL_FLAG_SCROLL or SCROLL_FLAG_ENTER_ALWAYS or SCROLL_FLAG_SNAP or SCROLL_FLAG_EXIT_UNTIL_COLLAPSED
+            }
+        }
+
+        view.layoutParams = params
+    }
+
+    companion object {
+        private const val TOOLBAR_ELEVATION = 16
     }
 }

app/src/main/java/org/mozilla/fenix/components/toolbar/SwipeRefreshScrollingViewBehavior.kt

@@ -0,0 +1,48 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+package org.mozilla.fenix.components.toolbar
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import com.google.android.material.appbar.AppBarLayout
+import mozilla.components.concept.engine.EngineView
+import mozilla.components.concept.engine.EngineView.InputResult.INPUT_RESULT_UNHANDLED
+import org.mozilla.fenix.ext.settings
+
+/**
+ * ScrollingViewBehavior that will setScrollFlags on BrowserToolbar based on EngineView touch handling
+ */
+class SwipeRefreshScrollingViewBehavior(
+    context: Context,
+    attrs: AttributeSet?,
+    private val engineView: EngineView,
+    private val browserToolbarView: BrowserToolbarView
+) : AppBarLayout.ScrollingViewBehavior(context, attrs) {
+    override fun onStartNestedScroll(
+        coordinatorLayout: CoordinatorLayout,
+        child: View,
+        directTargetChild: View,
+        target: View,
+        axes: Int,
+        type: Int
+    ): Boolean {
+
+        if (!browserToolbarView.view.context.settings().shouldUseBottomToolbar) {
+            val shouldDisable = engineView.getInputResult() == INPUT_RESULT_UNHANDLED
+            browserToolbarView.setScrollFlags(shouldDisable)
+        }
+
+        return super.onStartNestedScroll(
+            coordinatorLayout,
+            child,
+            directTargetChild,
+            target,
+            axes,
+            type
+        )
+    }
+}

app/src/main/java/org/mozilla/fenix/customtabs/ExternalAppBrowserFragment.kt

@@ -149,10 +149,6 @@ class ExternalAppBrowserFragment : BaseBrowserFragment(), UserInteractionHandler
                 }
             }
 
-            consumeFrom(browserFragmentStore) {
-                browserToolbarView.update(it)
-            }
-
             consumeFrom(components.core.customTabsStore) { state ->
                 getSessionById()
                     ?.let { session -> session.customTabConfig?.sessionToken }

app/src/main/res/layout/component_browser_top_toolbar.xml

@@ -2,7 +2,8 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<com.google.android.material.appbar.AppBarLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<com.google.android.material.appbar.AppBarLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     android:id="@+id/app_bar"
     android:layout_width="match_parent"
     android:layout_height="wrap_content">

app/src/main/res/layout/fragment_browser.xml

@@ -2,7 +2,8 @@
 <!-- This Source Code Form is subject to the terms of the Mozilla Public
    - License, v. 2.0. If a copy of the MPL was not distributed with this
    - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
-<androidx.coordinatorlayout.widget.CoordinatorLayout xmlns:android="http://schemas.android.com/apk/res/android"
+<androidx.coordinatorlayout.widget.CoordinatorLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto"
     xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/browserLayout"