Bug 1663000 - Handle the event as if it's consumed in the root APZC in InputQueue::ReceiveTouchInput() if there's contents covered by the dynamic toolbar. r=geckoview-reviewers,botond,snorp

Differential Revision: https://phabricator.services.mozilla.com/D93917

gfx/layers/apz/src/AsyncPanZoomController.cpp

@@ -856,9 +856,14 @@ bool AsyncPanZoomController::ArePointerEventsConsumable(
   bool pannableX = aBlock->TouchActionAllowsPanningX() &&
                    aBlock->GetOverscrollHandoffChain()->CanScrollInDirection(
                        this, ScrollDirection::eHorizontal);
-  bool pannableY = aBlock->TouchActionAllowsPanningY() &&
-                   aBlock->GetOverscrollHandoffChain()->CanScrollInDirection(
-                       this, ScrollDirection::eVertical);
+  bool pannableY =
+      (aBlock->TouchActionAllowsPanningY() &&
+       (aBlock->GetOverscrollHandoffChain()->CanScrollInDirection(
+            this, ScrollDirection::eVertical) ||
+        // In the case of the root APZC with any dynamic toolbar, it
+        // shoule be pannable if there is room moving the dynamic
+        // toolbar.
+        (IsRootContent() && CanScrollDownwardsWithDynamicToolbar())));
 
   bool pannable;
 

gfx/layers/apz/src/InputQueue.cpp

@@ -178,6 +178,11 @@ nsEventStatus InputQueue::ReceiveTouchInput(
       INPQ_LOG("dropping event due to block %p being in slop\n", block);
       result = nsEventStatus_eConsumeNoDefault;
     } else {
+      // FIXME: Even if the event is consumed in a non-root APZC, if scroll
+      // positions in all relevant APZCs are at the bottom edge and if there are
+      // contents covered by the dynamic toolbar, we need to handle the event as
+      // if it's consumed in the root APZC so that GeckoView can tel the
+      // dynamic toolbar needs to move.
       result = nsEventStatus_eConsumeDoDefault;
     }
   } else if (block->UpdateSlopState(aEvent, false)) {

mobile/android/geckoview/src/androidTest/java/org/mozilla/geckoview/test/PanZoomControllerTest.kt

@@ -354,8 +354,6 @@ class PanZoomControllerTest : BaseSessionTest() {
         assertThat("The input result should be HANDLED_CONTENT in iframe_100_percent_height_scrollable.html",
                    value, equalTo(PanZoomController.INPUT_RESULT_HANDLED_CONTENT))
 
-        // Below cases don't work yet without event handlers
-        if (withEventHandler) {
         // The content height is greater than "screen height - the dynamic toolbar height".
         setupTouchEventDocument(ROOT_98VH_HTML_PATH, withEventHandler)
         value = sessionRule.waitForResult(sendDownEvent(50f, 50f))
@@ -381,7 +379,6 @@ class PanZoomControllerTest : BaseSessionTest() {
         // The input result should be handled in the iframe content initially.
         assertThat("The input result should be HANDLED_CONTENT initially in iframe_98vh_scrollable.html",
                    value, equalTo(PanZoomController.INPUT_RESULT_HANDLED_CONTENT))
-        }
 
         // The following test doesn't work either with/without event handlers.
         if (false) {