Index: content/browser/renderer_host/render_widget_host_input_event_router.cc |
diff --git a/content/browser/renderer_host/render_widget_host_input_event_router.cc b/content/browser/renderer_host/render_widget_host_input_event_router.cc |
index fe73293b46648e74e62ba09a7c44d459d65bf308..091506016280e2ced7d67c6a169b856f704b10d0 100644 |
--- a/content/browser/renderer_host/render_widget_host_input_event_router.cc |
+++ b/content/browser/renderer_host/render_widget_host_input_event_router.cc |
@@ -285,10 +285,32 @@ void RenderWidgetHostInputEventRouter::RouteMouseWheelEvent( |
target, &transformed_point)) |
return; |
} else { |
- target = FindEventTarget( |
- root_view, |
- gfx::Point(event->PositionInWidget().x, event->PositionInWidget().y), |
- &transformed_point); |
+ if (root_view->wheel_scroll_latching_enabled()) { |
bokan
2017/06/15 15:47:17
Nit: make this an else if in the outer block
sahel
2017/06/16 14:56:20
Done.
|
+ if (event->phase == blink::WebMouseWheelEvent::kPhaseBegan) { |
+ wheel_target_.target = |
+ FindEventTarget(root_view, |
+ gfx::Point(event->PositionInWidget().x, |
+ event->PositionInWidget().y), |
+ &transformed_point); |
+ wheel_target_.delta = |
+ transformed_point - gfx::Point(event->PositionInWidget().x, |
+ event->PositionInWidget().y); |
+ target = wheel_target_.target; |
+ } else { |
+ if (wheel_target_.target) { |
+ target = wheel_target_.target; |
+ transformed_point = gfx::Point(event->PositionInWidget().x, |
+ event->PositionInWidget().y) + |
+ wheel_target_.delta; |
+ } |
+ } |
+ |
+ } else { // !root_view->wheel_scroll_latching_enabled() |
+ target = FindEventTarget( |
+ root_view, |
+ gfx::Point(event->PositionInWidget().x, event->PositionInWidget().y), |
+ &transformed_point); |
+ } |
} |
if (!target) |
@@ -296,6 +318,11 @@ void RenderWidgetHostInputEventRouter::RouteMouseWheelEvent( |
event->SetPositionInWidget(transformed_point.x(), transformed_point.y()); |
target->ProcessMouseWheelEvent(*event, latency); |
+ if (root_view->wheel_scroll_latching_enabled() && |
bokan
2017/06/15 15:47:17
Nit: doesn't hurt to clear this even if latching i
sahel
2017/06/16 14:56:20
Done.
|
+ (event->phase == blink::WebMouseWheelEvent::kPhaseEnded || |
+ event->momentum_phase == blink::WebMouseWheelEvent::kPhaseEnded)) { |
+ wheel_target_.target = nullptr; |
+ } |
} |
void RenderWidgetHostInputEventRouter::RouteGestureEvent( |