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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "content/browser/renderer_host/input/synthetic_gesture_target_base.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
#include "content/browser/renderer_host/render_widget_host_view_base.h"
#include "content/browser/renderer_host/ui_events_helper.h"
#include "third_party/blink/public/common/input/web_input_event.h"
#include "ui/events/blink/web_input_event_traits.h"
#include "ui/events/event.h"
#include "ui/latency/latency_info.h"
using blink::WebInputEvent;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
using blink::WebGestureEvent;
namespace content {
namespace {
// This value was determined experimentally. It was sufficient to not cause a
// fling on Android and Aura.
const int kPointerAssumedStoppedTimeMs = 100;
} // namespace
SyntheticGestureTargetBase::SyntheticGestureTargetBase(
RenderWidgetHostImpl* host)
: host_(host) {
DCHECK(host);
}
SyntheticGestureTargetBase::~SyntheticGestureTargetBase() {
}
void SyntheticGestureTargetBase::DispatchInputEventToPlatform(
const WebInputEvent& event) {
TRACE_EVENT1("input", "SyntheticGestureTarget::DispatchInputEventToPlatform",
"type", WebInputEvent::GetName(event.GetType()));
ui::LatencyInfo latency_info;
latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT);
if (WebInputEvent::IsTouchEventType(event.GetType())) {
const WebTouchEvent& web_touch =
static_cast<const WebTouchEvent&>(event);
// Check that all touch pointers are within the content bounds.
for (unsigned i = 0; i < web_touch.touches_length; i++) {
if (web_touch.touches[i].state == WebTouchPoint::State::kStatePressed &&
!PointIsWithinContents(web_touch.touches[i].PositionInWidget())) {
LOG(WARNING)
<< "Touch coordinates are not within content bounds on TouchStart.";
return;
}
}
DispatchWebTouchEventToPlatform(web_touch, latency_info);
} else if (event.GetType() == WebInputEvent::Type::kMouseWheel) {
const WebMouseWheelEvent& web_wheel =
static_cast<const WebMouseWheelEvent&>(event);
if (!PointIsWithinContents(web_wheel.PositionInWidget())) {
LOG(WARNING) << "Mouse wheel position is not within content bounds.";
return;
}
if (web_wheel.delta_units != ui::ScrollGranularity::kScrollByPercentage)
DispatchWebMouseWheelEventToPlatform(web_wheel, latency_info);
else {
// Percentage-based mouse wheel scrolls are implemented in the UI layer by
// converting a native event's wheel tick amount to a percentage and
// setting that directly on WebMouseWheelEvent (i.e. it does not read the
// ui::MouseWheelEvent). However, when dispatching a synthetic
// ui::MouseWheelEvent, the created WebMouseWheelEvent will copy values
// from the ui::MouseWheelEvent. ui::MouseWheelEvent does
// not have a float value for delta, so that codepath ends up truncating.
// So instead, dispatch the WebMouseWheelEvent directly through the
// RenderWidgetHostInputEventRouter attached to the RenderWidgetHostImpl.
DCHECK(host_->delegate());
DCHECK(host_->delegate()->IsWidgetForPrimaryMainFrame(host_));
DCHECK(host_->delegate()->GetInputEventRouter());
std::unique_ptr<WebInputEvent> wheel_evt_ptr = web_wheel.Clone();
host_->delegate()->GetInputEventRouter()->RouteMouseWheelEvent(
host_->GetView(),
static_cast<WebMouseWheelEvent*>(wheel_evt_ptr.get()), latency_info);
}
} else if (WebInputEvent::IsMouseEventType(event.GetType())) {
const WebMouseEvent& web_mouse =
static_cast<const WebMouseEvent&>(event);
if (event.GetType() == WebInputEvent::Type::kMouseDown &&
!PointIsWithinContents(web_mouse.PositionInWidget())) {
LOG(WARNING)
<< "Mouse pointer is not within content bounds on MouseDown.";
return;
}
DispatchWebMouseEventToPlatform(web_mouse, latency_info);
} else if (WebInputEvent::IsPinchGestureEventType(event.GetType())) {
const WebGestureEvent& web_pinch =
static_cast<const WebGestureEvent&>(event);
// Touchscreen pinches should be injected as touch events.
DCHECK_EQ(blink::WebGestureDevice::kTouchpad, web_pinch.SourceDevice());
if (event.GetType() == WebInputEvent::Type::kGesturePinchBegin &&
!PointIsWithinContents(web_pinch.PositionInWidget())) {
LOG(WARNING)
<< "Pinch coordinates are not within content bounds on PinchBegin.";
return;
}
DispatchWebGestureEventToPlatform(web_pinch, latency_info);
} else if (WebInputEvent::IsFlingGestureEventType(event.GetType())) {
const WebGestureEvent& web_fling =
static_cast<const WebGestureEvent&>(event);
// Touchscreen swipe should be injected as touch events.
DCHECK_EQ(blink::WebGestureDevice::kTouchpad, web_fling.SourceDevice());
if (event.GetType() == WebInputEvent::Type::kGestureFlingStart &&
!PointIsWithinContents(web_fling.PositionInWidget())) {
LOG(WARNING)
<< "Fling coordinates are not within content bounds on FlingStart.";
return;
}
DispatchWebGestureEventToPlatform(web_fling, latency_info);
} else {
NOTREACHED();
}
}
base::TimeDelta SyntheticGestureTargetBase::PointerAssumedStoppedTime()
const {
return base::Milliseconds(kPointerAssumedStoppedTimeMs);
}
float SyntheticGestureTargetBase::GetSpanSlopInDips() const {
// * 2 because span is the distance between two touch points in a pinch-zoom
// gesture so we're accounting for movement in two points.
return 2.f * GetTouchSlopInDips();
}
int SyntheticGestureTargetBase::GetMouseWheelMinimumGranularity() const {
return host_->GetView()->GetMouseWheelMinimumGranularity();
}
void SyntheticGestureTargetBase::WaitForTargetAck(
SyntheticGestureParams::GestureType type,
content::mojom::GestureSourceType source,
base::OnceClosure callback) const {
host_->WaitForInputProcessed(type, source, std::move(callback));
}
bool SyntheticGestureTargetBase::PointIsWithinContents(
gfx::PointF point) const {
gfx::Rect bounds = host_->GetView()->GetViewBounds();
bounds -= bounds.OffsetFromOrigin(); // Translate the bounds to (0,0).
return bounds.Contains(point.x(), point.y());
}
} // namespace content
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