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// Copyright 2013 The Chromium Authors. All rights reserved.
// 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_view_base.h"
#include "content/browser/renderer_host/ui_events_helper.h"
#include "content/common/input_messages.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
#include "ui/events/event.h"
#include "ui/events/latency_info.h"
using blink::WebInputEvent;
using blink::WebTouchEvent;
using blink::WebTouchPoint;
using blink::WebMouseEvent;
using blink::WebMouseWheelEvent;
namespace content {
namespace {
// This value was determined experimentally. It was sufficient to not cause a
// fling on Android and Aura.
const int kPointerAssumedStoppedTimeMs = 100;
// SyntheticGestureTargetBase passes input events straight on to the renderer
// without going through a gesture recognition framework. There is thus no touch
// slop.
const float kTouchSlopInDips = 0.0f;
} // namespace
SyntheticGestureTargetBase::SyntheticGestureTargetBase(
RenderWidgetHostImpl* host)
: host_(host) {
DCHECK(host);
}
SyntheticGestureTargetBase::~SyntheticGestureTargetBase() {
}
void SyntheticGestureTargetBase::DispatchInputEventToPlatform(
const WebInputEvent& event) {
TRACE_EVENT1("input",
"SyntheticGestureTarget::DispatchInputEventToPlatform",
"type", WebInputEventTraits::GetName(event.type));
ui::LatencyInfo latency_info;
latency_info.AddLatencyNumber(ui::INPUT_EVENT_LATENCY_UI_COMPONENT, 0, 0);
if (WebInputEvent::isTouchEventType(event.type)) {
const WebTouchEvent& web_touch =
static_cast<const WebTouchEvent&>(event);
// Check that all touch pointers are within the content bounds.
if (web_touch.type == WebInputEvent::TouchStart) {
for (unsigned i = 0; i < web_touch.touchesLength; i++)
CHECK(web_touch.touches[i].state != WebTouchPoint::StatePressed ||
PointIsWithinContents(web_touch.touches[i].position.x,
web_touch.touches[i].position.y))
<< "Touch coordinates are not within content bounds on TouchStart.";
}
DispatchWebTouchEventToPlatform(web_touch, latency_info);
} else if (event.type == WebInputEvent::MouseWheel) {
const WebMouseWheelEvent& web_wheel =
static_cast<const WebMouseWheelEvent&>(event);
CHECK(PointIsWithinContents(web_wheel.x, web_wheel.y))
<< "Mouse wheel position is not within content bounds.";
DispatchWebMouseWheelEventToPlatform(web_wheel, latency_info);
} else if (WebInputEvent::isMouseEventType(event.type)) {
const WebMouseEvent& web_mouse =
static_cast<const WebMouseEvent&>(event);
CHECK(event.type != WebInputEvent::MouseDown ||
PointIsWithinContents(web_mouse.x, web_mouse.y))
<< "Mouse pointer is not within content bounds on MouseDown.";
DispatchWebMouseEventToPlatform(web_mouse, latency_info);
} else {
NOTREACHED();
}
}
void SyntheticGestureTargetBase::DispatchWebTouchEventToPlatform(
const blink::WebTouchEvent& web_touch,
const ui::LatencyInfo& latency_info) {
// We assume that platforms supporting touch have their own implementation of
// SyntheticGestureTarget to route the events through their respective input
// stack.
CHECK(false) << "Touch events not supported for this browser.";
}
void SyntheticGestureTargetBase::DispatchWebMouseWheelEventToPlatform(
const blink::WebMouseWheelEvent& web_wheel,
const ui::LatencyInfo& latency_info) {
host_->ForwardWheelEventWithLatencyInfo(web_wheel, latency_info);
}
void SyntheticGestureTargetBase::DispatchWebMouseEventToPlatform(
const blink::WebMouseEvent& web_mouse,
const ui::LatencyInfo& latency_info) {
host_->ForwardMouseEventWithLatencyInfo(web_mouse, latency_info);
}
void SyntheticGestureTargetBase::SetNeedsFlush() {
host_->SetNeedsFlush();
}
SyntheticGestureParams::GestureSourceType
SyntheticGestureTargetBase::GetDefaultSyntheticGestureSourceType() const {
return SyntheticGestureParams::MOUSE_INPUT;
}
base::TimeDelta SyntheticGestureTargetBase::PointerAssumedStoppedTime()
const {
return base::TimeDelta::FromMilliseconds(kPointerAssumedStoppedTimeMs);
}
float SyntheticGestureTargetBase::GetTouchSlopInDips() const {
return kTouchSlopInDips;
}
float SyntheticGestureTargetBase::GetMinScalingSpanInDips() const {
// The minimum scaling distance is only relevant for touch gestures and the
// base target doesn't support touch.
NOTREACHED();
return 0.0f;
}
bool SyntheticGestureTargetBase::PointIsWithinContents(int x, int y) const {
gfx::Rect bounds = host_->GetView()->GetViewBounds();
bounds -= bounds.OffsetFromOrigin(); // Translate the bounds to (0,0).
return bounds.Contains(x, y);
}
} // namespace content
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