cef/libcef/browser/osr/motion_event_osr.cc

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// Copyright (c) 2017 The Chromium Embedded Framework Authors.
// Portions copyright (c) 2012 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 "libcef/browser/osr/motion_event_osr.h"
#include <algorithm>
#include "ui/events/base_event_utils.h"
#include "ui/events/gesture_detection/gesture_configuration.h"
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namespace {
ui::MotionEvent::ToolType CefPointerTypeToMotionEventToolType(
cef_pointer_type_t pointer_type) {
switch (pointer_type) {
case CEF_POINTER_TYPE_TOUCH:
return ui::MotionEvent::ToolType::FINGER;
case CEF_POINTER_TYPE_MOUSE:
return ui::MotionEvent::ToolType::MOUSE;
case CEF_POINTER_TYPE_PEN:
return ui::MotionEvent::ToolType::STYLUS;
case CEF_POINTER_TYPE_ERASER:
return ui::MotionEvent::ToolType::ERASER;
case CEF_POINTER_TYPE_UNKNOWN:
return ui::MotionEvent::ToolType::UNKNOWN;
}
DCHECK(false);
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return ui::MotionEvent::ToolType::UNKNOWN;
}
} // namespace
CefMotionEventOSR::CefMotionEventOSR() {
std::fill(id_map_, id_map_ + blink::WebTouchEvent::kTouchesLengthCap, -1);
}
CefMotionEventOSR::~CefMotionEventOSR() {}
int CefMotionEventOSR::GetSourceDeviceId(size_t pointer_index) const {
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if (IsValidIndex(pointer_index)) {
return pointer(pointer_index).source_device_id;
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} else {
return -1;
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}
}
// Returns true if the touch was valid.
bool CefMotionEventOSR::OnTouch(const CefTouchEvent& touch) {
int id = LookupId(touch.id);
bool pointer_id_is_active = id != -1;
if (touch.type == CEF_TET_PRESSED && pointer_id_is_active) {
// Ignore pressed events for already active touches.
return false;
} else if (touch.type != CEF_TET_PRESSED && !pointer_id_is_active) {
// When a window begins capturing touch events, we could have an active
// touch stream transfered to us, resulting in touch move or touch up
// events without associated touch down events. Ignore them.
return false;
}
switch (touch.type) {
case CEF_TET_PRESSED:
id = AddId(touch.id);
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if (id == -1) {
return false;
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}
if (!AddTouch(touch, id)) {
return false;
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}
break;
case CEF_TET_MOVED: {
// Discard if touch is stationary.
int index = FindPointerIndexOfId(id);
if (IsValidIndex(index) &&
(touch.x == GetX(index) && touch.y == GetY(index))) {
return false;
}
}
[[fallthrough]];
// No break.
case CEF_TET_RELEASED:
case CEF_TET_CANCELLED:
// Removing these touch points needs to be postponed until after the
// MotionEvent has been dispatched. This cleanup occurs in
// CleanupRemovedTouchPoints.
UpdateTouch(touch, id);
break;
}
UpdateCachedAction(touch, id);
set_unique_event_id(ui::GetNextTouchEventId());
set_flags(touch.modifiers);
set_event_time(base::TimeTicks::Now());
return true;
}
// We can't cleanup removed touch points immediately upon receipt of a
// TouchCancel or TouchRelease, as the MotionEvent needs to be able to report
// information about those touch events. Once the MotionEvent has been
// processed, we call CleanupRemovedTouchPoints to do the required
// book-keeping.
void CefMotionEventOSR::CleanupRemovedTouchPoints(const CefTouchEvent& event) {
if (event.type != CEF_TET_RELEASED && event.type != CEF_TET_CANCELLED) {
return;
}
DCHECK(GetPointerCount());
int id = LookupId(event.id);
int index_to_delete = FindPointerIndexOfId(id);
set_action_index(-1);
set_action(ui::MotionEvent::Action::NONE);
if (IsValidIndex(index_to_delete)) {
pointer(index_to_delete) = pointer(GetPointerCount() - 1);
PopPointer();
RemoveId(event.id);
}
}
// Reset unchanged touch point to StateStationary for touchmove and touchcancel.
void CefMotionEventOSR::MarkUnchangedTouchPointsAsStationary(
blink::WebTouchEvent* event,
const CefTouchEvent& cef_event) {
int id = LookupId(cef_event.id);
if (event->GetType() == blink::WebInputEvent::Type::kTouchMove ||
event->GetType() == blink::WebInputEvent::Type::kTouchCancel) {
for (size_t i = 0; i < event->touches_length; ++i) {
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if (event->touches[i].id != id) {
event->touches[i].state = blink::WebTouchPoint::State::kStateStationary;
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}
}
}
}
int CefMotionEventOSR::LookupId(int id) {
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if (id == -1) {
return -1;
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}
for (int i = 0; i < blink::WebTouchEvent::kTouchesLengthCap; i++) {
if (id_map_[i] == id) {
return i;
}
}
return -1;
}
int CefMotionEventOSR::AddId(int id) {
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if (id == -1 || LookupId(id) >= 0) {
return -1;
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}
for (int i = 0; i < blink::WebTouchEvent::kTouchesLengthCap; i++) {
if (id_map_[i] == -1) {
id_map_[i] = id;
return i;
}
}
return -1;
}
void CefMotionEventOSR::RemoveId(int id) {
for (int i = 0; i < blink::WebTouchEvent::kTouchesLengthCap; i++) {
if (id_map_[i] == id) {
id_map_[i] = -1;
}
}
}
bool CefMotionEventOSR::AddTouch(const CefTouchEvent& touch, int id) {
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if (GetPointerCount() == MotionEvent::MAX_TOUCH_POINT_COUNT) {
return false;
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}
PushPointer(GetPointerPropertiesFromTouchEvent(touch, id));
return true;
}
void CefMotionEventOSR::UpdateTouch(const CefTouchEvent& touch, int id) {
int index_to_update = FindPointerIndexOfId(id);
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if (IsValidIndex(index_to_update)) {
pointer(index_to_update) = GetPointerPropertiesFromTouchEvent(touch, id);
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}
}
void CefMotionEventOSR::UpdateCachedAction(const CefTouchEvent& touch, int id) {
DCHECK(GetPointerCount());
switch (touch.type) {
case CEF_TET_PRESSED:
if (GetPointerCount() == 1) {
set_action(ui::MotionEvent::Action::DOWN);
} else {
set_action(ui::MotionEvent::Action::POINTER_DOWN);
set_action_index(FindPointerIndexOfId(id));
}
break;
case CEF_TET_RELEASED:
if (GetPointerCount() == 1) {
set_action(ui::MotionEvent::Action::UP);
} else {
set_action(ui::MotionEvent::Action::POINTER_UP);
set_action_index(FindPointerIndexOfId(id));
}
break;
case CEF_TET_CANCELLED:
set_action(ui::MotionEvent::Action::CANCEL);
break;
case CEF_TET_MOVED:
set_action(ui::MotionEvent::Action::MOVE);
break;
}
}
bool CefMotionEventOSR::IsValidIndex(int index) const {
return (index >= 0) && (index < static_cast<int>(GetPointerCount()));
}
ui::PointerProperties CefMotionEventOSR::GetPointerPropertiesFromTouchEvent(
const CefTouchEvent& touch,
int id) {
ui::PointerProperties pointer_properties;
pointer_properties.x = touch.x;
pointer_properties.y = touch.y;
pointer_properties.raw_x = touch.x;
pointer_properties.raw_y = touch.y;
pointer_properties.id = id;
pointer_properties.pressure = touch.pressure;
pointer_properties.source_device_id = 0;
pointer_properties.SetAxesAndOrientation(touch.radius_x, touch.radius_y,
touch.rotation_angle);
if (!pointer_properties.touch_major) {
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float default_size;
switch (touch.pointer_type) {
case CEF_POINTER_TYPE_PEN:
case CEF_POINTER_TYPE_ERASER:
// Default size for stylus events is 1x1.
default_size = 1;
break;
default:
default_size =
2.f * ui::GestureConfiguration::GetInstance()->default_radius();
break;
}
pointer_properties.touch_major = pointer_properties.touch_minor =
default_size;
pointer_properties.orientation = 0;
}
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pointer_properties.tool_type =
CefPointerTypeToMotionEventToolType(touch.pointer_type);
return pointer_properties;
}