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// 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 "content/renderer/mouse_lock_dispatcher.h"
#include "base/check.h"
#include "third_party/blink/public/common/input/web_input_event.h"
namespace content {
MouseLockDispatcher::MouseLockDispatcher()
: pending_lock_request_(false),
pending_unlock_request_(false),
target_(nullptr) {}
MouseLockDispatcher::~MouseLockDispatcher() = default;
bool MouseLockDispatcher::LockMouse(
LockTarget* target,
blink::WebLocalFrame* requester_frame,
blink::WebWidgetClient::PointerLockCallback callback,
bool request_unadjusted_movement) {
if (MouseLockedOrPendingAction())
return false;
pending_lock_request_ = true;
target_ = target;
lock_mouse_callback_ = std::move(callback);
SendLockMouseRequest(requester_frame, request_unadjusted_movement);
return true;
}
bool MouseLockDispatcher::ChangeMouseLock(
LockTarget* target,
blink::WebLocalFrame* requester_frame,
blink::WebWidgetClient::PointerLockCallback callback,
bool request_unadjusted_movement) {
if (!mouse_lock_context_)
return false;
lock_mouse_callback_ = std::move(callback);
// Unretained is safe because |this| owns the mojo::Remote
mouse_lock_context_->RequestMouseLockChange(
request_unadjusted_movement,
base::BindOnce(&MouseLockDispatcher::OnChangeLockAck,
base::Unretained(this)));
return true;
}
void MouseLockDispatcher::FlushContextPipeForTesting() {
if (mouse_lock_context_)
mouse_lock_context_.FlushForTesting();
}
void MouseLockDispatcher::UnlockMouse(LockTarget* target) {
if (IsMouseLockedTo(target)) {
mouse_lock_context_.reset();
target->OnMouseLockLost();
}
}
void MouseLockDispatcher::OnLockTargetDestroyed(LockTarget* target) {
if (target == target_) {
UnlockMouse(target);
target_ = nullptr;
}
}
void MouseLockDispatcher::ClearLockTarget() {
OnLockTargetDestroyed(target_);
}
bool MouseLockDispatcher::IsMouseLockedTo(LockTarget* target) {
return mouse_lock_context_ && target_ == target;
}
bool MouseLockDispatcher::WillHandleMouseEvent(
const blink::WebMouseEvent& event) {
if (mouse_lock_context_ && target_)
return target_->HandleMouseLockedInputEvent(event);
return false;
}
void MouseLockDispatcher::OnChangeLockAck(
blink::mojom::PointerLockResult result) {
pending_lock_request_ = false;
if (lock_mouse_callback_) {
std::move(lock_mouse_callback_).Run(result);
}
}
void MouseLockDispatcher::OnLockMouseACK(
blink::mojom::PointerLockResult result,
mojo::PendingRemote<blink::mojom::PointerLockContext> context) {
DCHECK(!mouse_lock_context_ && pending_lock_request_);
pending_lock_request_ = false;
if (pending_unlock_request_ && !context) {
// We have sent an unlock request after the lock request. However, since
// the lock request has failed, the unlock request will be ignored by the
// browser side and there won't be any response to it.
pending_unlock_request_ = false;
}
if (context) {
mouse_lock_context_.Bind(std::move(context));
// The browser might unlock the mouse for many reasons including closing
// the tab, the user hitting esc, the page losing focus, and more.
mouse_lock_context_.set_disconnect_handler(base::BindOnce(
&MouseLockDispatcher::OnMouseLockLost, base::Unretained(this)));
}
if (lock_mouse_callback_)
std::move(lock_mouse_callback_).Run(result);
LockTarget* last_target = target_;
if (!mouse_lock_context_)
target_ = nullptr;
// Callbacks made after all state modification to prevent reentrant errors
// such as OnLockMouseACK() synchronously calling LockMouse().
if (last_target)
last_target->OnLockMouseACK(result ==
blink::mojom::PointerLockResult::kSuccess);
}
void MouseLockDispatcher::OnMouseLockLost() {
DCHECK(mouse_lock_context_ && !pending_lock_request_);
mouse_lock_context_.reset();
pending_unlock_request_ = false;
LockTarget* last_target = target_;
target_ = nullptr;
// Callbacks made after all state modification to prevent reentrant errors
// such as OnMouseLockLost() synchronously calling LockMouse().
if (last_target)
last_target->OnMouseLockLost();
}
} // namespace content
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