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// Copyright 2017 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "base/run_loop.h"
#include "base/task/single_thread_task_runner.h"
#include "build/build_config.h"
#include "components/input/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/public/test/browser_test.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/public/test/hit_test_region_observer.h"
#include "content/shell/browser/shell.h"
#include "third_party/blink/public/common/input/synthetic_web_input_event_builders.h"
#include "ui/events/gesture_detection/gesture_configuration.h"
#if BUILDFLAG(IS_ANDROID)
#include "content/browser/renderer_host/render_widget_host_view_android.h"
#endif
using blink::WebMouseWheelEvent;
namespace {
void GiveItSomeTime() {
base::RunLoop run_loop;
base::SingleThreadTaskRunner::GetCurrentDefault()->PostDelayedTask(
FROM_HERE, run_loop.QuitClosure(), base::Milliseconds(20));
run_loop.Run();
}
const char kWheelEventLatchingDataURL[] = R"HTML(
<!DOCTYPE html>
<meta name='viewport' content='width=device-width, minimum-scale=1'>
<style>
body {
height: 10000px;
}
%23scrollableDiv {
position: absolute;
left: 50px;
top: 100px;
width: 200px;
height: 200px;
overflow: scroll;
background: red;
}
%23nestedDiv {
width: 200px;
height: 8000px;
opacity: 0;
}
</style>
<div id='scrollableDiv'>
<div id='nestedDiv'></div>
</div>
<script>
var scrollableDiv = document.getElementById('scrollableDiv');
var scrollableDivWheelEventCounter = 0;
var documentWheelEventCounter = 0;
scrollableDiv.addEventListener('wheel',
function(e) {
scrollableDivWheelEventCounter++;
e.stopPropagation();
});
document.scrollingElement.addEventListener('wheel',
function(e) { documentWheelEventCounter++; });
</script>)HTML";
} // namespace
namespace content {
class WheelScrollLatchingBrowserTest : public ContentBrowserTest {
public:
WheelScrollLatchingBrowserTest() {
ui::GestureConfiguration::GetInstance()->set_scroll_debounce_interval_in_ms(
0);
}
~WheelScrollLatchingBrowserTest() override {}
protected:
RenderWidgetHostImpl* GetWidgetHost() {
return RenderWidgetHostImpl::From(
web_contents()->GetRenderViewHost()->GetWidget());
}
WebContentsImpl* web_contents() const {
return static_cast<WebContentsImpl*>(shell()->web_contents());
}
input::RenderWidgetHostInputEventRouter* GetRouter() {
return web_contents()->GetInputEventRouter();
}
RenderWidgetHostViewBase* GetRootView() {
return static_cast<RenderWidgetHostViewBase*>(web_contents()
->GetPrimaryFrameTree()
.root()
->current_frame_host()
->GetView());
}
void LoadURL(const std::string& page_data) {
const GURL data_url("data:text/html;charset=utf-8," + page_data);
EXPECT_TRUE(NavigateToURL(shell(), data_url));
RenderWidgetHostImpl* host = GetWidgetHost();
host->GetView()->SetSize(gfx::Size(600, 600));
// The page is loaded in the renderer, wait for a new frame to arrive.
// That's equivalent to hit test data being ready.
HitTestRegionObserver hittest_observer(host->GetFrameSinkId());
hittest_observer.WaitForHitTestData();
}
};
// Start scrolling by mouse wheel on the document: the wheel event will be sent
// to the document's scrolling element, the scrollable div will be under the
// cursor after applying the scrolling. Continue scrolling by mouse wheel, since
// wheel scroll latching is enabled the wheel event will be still sent to the
// document's scrolling element and the document's scrolling element will
// continue scrolling.
IN_PROC_BROWSER_TEST_F(WheelScrollLatchingBrowserTest, WheelEventTarget) {
LoadURL(kWheelEventLatchingDataURL);
EXPECT_EQ(0, EvalJs(shell(), "documentWheelEventCounter"));
EXPECT_EQ(0, EvalJs(shell(), "scrollableDivWheelEventCounter"));
MainThreadFrameObserver frame_observer(GetWidgetHost());
auto input_msg_watcher = std::make_unique<InputMsgWatcher>(
GetWidgetHost(), blink::WebInputEvent::Type::kMouseWheel);
float scrollable_div_top =
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().top")
.ExtractDouble();
float x = (EvalJs(shell(), "scrollableDiv.getBoundingClientRect().left")
.ExtractDouble() +
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().right")
.ExtractDouble()) /
2;
float y = 0.1 * scrollable_div_top;
float delta_x = 0;
float delta_y = -0.6 * scrollable_div_top;
blink::WebMouseWheelEvent wheel_event =
blink::SyntheticWebMouseWheelEventBuilder::Build(
x, y, x, y, delta_x, delta_y, 0,
ui::ScrollGranularity::kScrollByPrecisePixel);
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseBegan;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
// Runs until we get the InputMsgAck callback.
EXPECT_EQ(blink::mojom::InputEventResultState::kSetNonBlocking,
input_msg_watcher->WaitForAck());
while (
EvalJs(shell(), "document.scrollingElement.scrollTop").ExtractDouble() <
-delta_y) {
frame_observer.Wait();
}
EXPECT_EQ(0, EvalJs(shell(), "scrollableDiv.scrollTop"));
EXPECT_EQ(1, EvalJs(shell(), "documentWheelEventCounter"));
EXPECT_EQ(0, EvalJs(shell(), "scrollableDivWheelEventCounter"));
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseChanged;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
while (
EvalJs(shell(), "document.scrollingElement.scrollTop").ExtractDouble() <
-2 * delta_y) {
frame_observer.Wait();
}
EXPECT_EQ(0, EvalJs(shell(), "scrollableDiv.scrollTop"));
EXPECT_EQ(2, EvalJs(shell(), "documentWheelEventCounter"));
EXPECT_EQ(0, EvalJs(shell(), "scrollableDivWheelEventCounter"));
}
// TODO(crbug.com/1248231, crbug.com/1313237): consider removing this test.
IN_PROC_BROWSER_TEST_F(WheelScrollLatchingBrowserTest,
DISABLED_WheelEventRetargetWhenTargetRemoved) {
LoadURL(kWheelEventLatchingDataURL);
EXPECT_EQ(0, EvalJs(shell(), "documentWheelEventCounter"));
EXPECT_EQ(0, EvalJs(shell(), "scrollableDivWheelEventCounter"));
auto update_msg_watcher = std::make_unique<InputMsgWatcher>(
GetWidgetHost(), blink::WebInputEvent::Type::kGestureScrollUpdate);
float scrollable_div_top =
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().top")
.ExtractDouble();
float x = (EvalJs(shell(), "scrollableDiv.getBoundingClientRect().left")
.ExtractDouble() +
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().right")
.ExtractDouble()) /
2;
float y = 1.1 * scrollable_div_top;
float delta_x = 0;
float delta_y = -0.6 * scrollable_div_top;
blink::WebMouseWheelEvent wheel_event =
blink::SyntheticWebMouseWheelEventBuilder::Build(
x, y, x, y, delta_x, delta_y, 0,
ui::ScrollGranularity::kScrollByPrecisePixel);
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseBegan;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
// Runs until we get the UpdateMsgAck callback.
EXPECT_EQ(blink::mojom::InputEventResultState::kConsumed,
update_msg_watcher->WaitForAck());
EXPECT_EQ(0, EvalJs(shell(), "document.scrollingElement.scrollTop"));
EXPECT_EQ(0, EvalJs(shell(), "documentWheelEventCounter"));
EXPECT_EQ(1, EvalJs(shell(), "scrollableDivWheelEventCounter"));
// Remove the scrollableDiv which is the current target for wheel events.
EXPECT_TRUE(
ExecJs(shell(), "scrollableDiv.parentNode.removeChild(scrollableDiv)"));
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseChanged;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
// Runs until we get the UpdateMsgAck callbacks.
EXPECT_EQ(blink::mojom::InputEventResultState::kConsumed,
update_msg_watcher->WaitForAck());
// Wait for the document event listenr to handle the second wheel event.
while (EvalJs(shell(), "documentWheelEventCounter") != 1) {
GiveItSomeTime();
}
EXPECT_EQ(1, EvalJs(shell(), "scrollableDivWheelEventCounter"));
}
// crbug.com/777258 Flaky everywhere.
IN_PROC_BROWSER_TEST_F(
WheelScrollLatchingBrowserTest,
DISABLED_WheelScrollingRelatchWhenLatchedScrollerRemoved) {
LoadURL(kWheelEventLatchingDataURL);
EXPECT_EQ(EvalJs(shell(), "document.scrollingElement.scrollTop"), 0);
EXPECT_EQ(EvalJs(shell(), "scrollableDiv.scrollTop"), 0);
float x = (EvalJs(shell(), "scrollableDiv.getBoundingClientRect().left")
.ExtractDouble() +
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().right")
.ExtractDouble()) /
2;
float y = (EvalJs(shell(), "scrollableDiv.getBoundingClientRect().top")
.ExtractDouble() +
EvalJs(shell(), "scrollableDiv.getBoundingClientRect().bottom")
.ExtractDouble()) /
2;
#if BUILDFLAG(IS_CHROMEOS)
bool precise = true;
#else
bool precise = false;
#endif
// Send a GSB event to start scrolling the scrollableDiv.
blink::WebGestureEvent gesture_scroll_begin(
blink::WebGestureEvent::Type::kGestureScrollBegin,
blink::WebInputEvent::kNoModifiers,
blink::WebInputEvent::GetStaticTimeStampForTests(),
blink::WebGestureDevice::kTouchpad);
gesture_scroll_begin.data.scroll_begin.delta_hint_units =
precise ? ui::ScrollGranularity::kScrollByPrecisePixel
: ui::ScrollGranularity::kScrollByPixel;
gesture_scroll_begin.data.scroll_begin.delta_x_hint = 0.f;
gesture_scroll_begin.data.scroll_begin.delta_y_hint = -20.f;
gesture_scroll_begin.SetPositionInWidget(gfx::PointF(x, y));
gesture_scroll_begin.SetPositionInScreen(gfx::PointF(x, y));
GetRootView()->ProcessGestureEvent(gesture_scroll_begin, ui::LatencyInfo());
// Send the first GSU event.
blink::WebGestureEvent gesture_scroll_update(gesture_scroll_begin);
gesture_scroll_update.SetType(
blink::WebGestureEvent::Type::kGestureScrollUpdate);
gesture_scroll_update.data.scroll_update.delta_units =
precise ? ui::ScrollGranularity::kScrollByPrecisePixel
: ui::ScrollGranularity::kScrollByPixel;
gesture_scroll_update.data.scroll_update.delta_x = 0.f;
gesture_scroll_update.data.scroll_update.delta_y = -20.f;
GetRootView()->ProcessGestureEvent(gesture_scroll_update, ui::LatencyInfo());
// Wait for the scrollableDiv to scroll.
while (EvalJs(shell(), "scrollableDiv.scrollTop") < 20) {
GiveItSomeTime();
}
// Remove the scrollableDiv which is the current scroller and send the second
// GSU.
EXPECT_TRUE(
ExecJs(shell(), "scrollableDiv.parentNode.removeChild(scrollableDiv)"));
GiveItSomeTime();
GetRootView()->ProcessGestureEvent(gesture_scroll_update, ui::LatencyInfo());
while (EvalJs(shell(), "document.scrollingElement.scrollTop") < 20) {
GiveItSomeTime();
}
}
const char kWheelRetargetIfPreventedByDefault[] = R"HTML(
<!DOCTYPE html>
<meta name='viewport' content='width=device-width, minimum-scale=1'>
<style>
%23blueDiv {
position: absolute;
left: 50px;
top: 100px;
width: 200px;
height: 200px;
display: block;
background: blue;
}
%23redDiv {
width: 200px;
height: 200px;
display: none;
background: red;
}
</style>
<body>
<div id='blueDiv'>
<div id='redDiv'></div>
</div>
</body>
<script>
var blueDiv = document.getElementById('blueDiv');
var redDiv = document.getElementById('redDiv');
var domTarget = 'noTarget';
var x = (blueDiv.getBoundingClientRect().left +
blueDiv.getBoundingClientRect().right) / 2;
var y = (blueDiv.getBoundingClientRect().top +
blueDiv.getBoundingClientRect().bottom) /2;
blueDiv.addEventListener('wheel', function(e) {
e.preventDefault();
domTarget = 'blueDiv';
redDiv.style.display = 'block';
});
redDiv.addEventListener('wheel', function(e) {
domTarget = 'redDiv';
e.stopPropagation();
});
</script>)HTML";
IN_PROC_BROWSER_TEST_F(WheelScrollLatchingBrowserTest,
WheelEventRetargetOnPreventDefault) {
LoadURL(kWheelRetargetIfPreventedByDefault);
float x = EvalJs(shell(), "x").ExtractDouble();
float y = EvalJs(shell(), "y").ExtractDouble();
// Send the first wheel event.
auto wheel_msg_watcher = std::make_unique<InputMsgWatcher>(
GetWidgetHost(), blink::WebInputEvent::Type::kMouseWheel);
blink::WebMouseWheelEvent wheel_event =
blink::SyntheticWebMouseWheelEventBuilder::Build(
x, y, x, y, 1, 1, 0, ui::ScrollGranularity::kScrollByPrecisePixel);
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseBegan;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
// Run until we get the callback, then check the target.
EXPECT_EQ(blink::mojom::InputEventResultState::kConsumed,
wheel_msg_watcher->WaitForAck());
EXPECT_EQ("blueDiv", EvalJs(shell(), "domTarget"));
// Send the second wheel event.
wheel_msg_watcher = std::make_unique<InputMsgWatcher>(
GetWidgetHost(), blink::WebInputEvent::Type::kMouseWheel);
wheel_event.phase = blink::WebMouseWheelEvent::kPhaseChanged;
GetRouter()->RouteMouseWheelEvent(GetRootView(), &wheel_event,
ui::LatencyInfo());
// Run until we get the callback, then check the target.
EXPECT_EQ(blink::mojom::InputEventResultState::kNotConsumed,
wheel_msg_watcher->WaitForAck());
EXPECT_EQ("redDiv", EvalJs(shell(), "domTarget"));
}
} // namespace content
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