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accelerator_controller_registrar.cc
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accelerator_controller_registrar.cc
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// Copyright 2016 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 "ash/accelerators/accelerator_controller_registrar.h"
#include <limits>
#include "ash/accelerators/accelerator_controller.h"
#include "ash/accelerators/accelerator_ids.h"
#include "ash/accelerators/accelerator_router.h"
#include "ash/public/interfaces/event_properties.mojom.h"
#include "ash/shell.h"
#include "ash/window_manager.h"
#include "ash/wm/window_cycle_controller.h"
#include "ash/wm/window_util.h"
#include "base/logging.h"
#include "services/ui/common/accelerator_util.h"
#include "services/ui/public/cpp/property_type_converters.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/base/accelerators/accelerator_history.h"
namespace ash {
namespace {
// Callback from registering the accelerators.
void OnAcceleratorsAdded(const std::vector<ui::Accelerator>& accelerators,
bool added) {
// All our accelerators should be registered, so we expect |added| to be true.
DCHECK(added) << "Unexpected accelerator vector registration failure.";
}
} // namespace
AcceleratorControllerRegistrar::AcceleratorControllerRegistrar(
WindowManager* window_manager,
uint16_t id_namespace)
: window_cycle_complete_accelerator_(ui::VKEY_MENU,
ui::EF_NONE,
ui::Accelerator::KeyState::RELEASED),
window_cycle_cancel_accelerator_(ui::VKEY_ESCAPE, ui::EF_ALT_DOWN),
window_manager_(window_manager),
id_namespace_(id_namespace),
next_id_(0),
router_(new AcceleratorRouter) {
window_manager_->AddAcceleratorHandler(id_namespace, this);
RegisterWindowCycleAccelerators();
}
AcceleratorControllerRegistrar::~AcceleratorControllerRegistrar() {
window_manager_->RemoveAcceleratorHandler(id_namespace_);
if (!window_manager_->window_manager_client())
return;
// TODO(sky): consider not doing this. If we assume the destructor is called
// during shutdown, then this is unnecessary and results in a bunch of
// messages that are dropped.
for (uint16_t local_id : ids_) {
window_manager_->window_manager_client()->RemoveAccelerator(
ComputeAcceleratorId(id_namespace_, local_id));
}
}
ui::mojom::EventResult AcceleratorControllerRegistrar::OnAccelerator(
uint32_t id,
const ui::Event& event,
base::flat_map<std::string, std::vector<uint8_t>>* properties) {
const ui::Accelerator accelerator(*event.AsKeyEvent());
auto iter = accelerator_to_ids_.find(accelerator);
if (iter == accelerator_to_ids_.end()) {
// Because of timing we may have unregistered the accelerator already,
// ignore in that case.
return ui::mojom::EventResult::UNHANDLED;
}
const Ids& ids = iter->second;
AcceleratorController* accelerator_controller =
Shell::Get()->accelerator_controller();
const bool is_pre = GetAcceleratorLocalId(id) == ids.pre_id;
if (is_pre) {
// TODO(sky): this does not exactly match ash code. In particular ash code
// is called for *all* key events, where as this is only called for
// registered accelerators. This means the previous accelerator isn't the
// same as it was in ash. We need to figure out exactly what is needed of
// previous accelerator so that we can either register for the right set of
// accelerators, or make WS send the previous accelerator.
// http://crbug.com/630683.
accelerator_controller->accelerator_history()->StoreCurrentAccelerator(
accelerator);
if (HandleWindowCycleAccelerator(accelerator))
return ui::mojom::EventResult::HANDLED;
aura::Window* target_window = wm::GetFocusedWindow();
if (!target_window)
target_window = Shell::GetRootWindowForNewWindows();
DCHECK(target_window);
if (router_->ProcessAccelerator(target_window, *(event.AsKeyEvent()),
accelerator)) {
return ui::mojom::EventResult::HANDLED;
}
if (accelerator_controller->IsActionForAcceleratorEnabled(accelerator)) {
// We do have an accelerator for the key. Set a property so that the real
// target knows we have an accelerator.
(*properties)[mojom::kWillProcessAccelerator_KeyEventProperty] =
std::vector<uint8_t>();
}
return ui::mojom::EventResult::UNHANDLED;
}
DCHECK_EQ(GetAcceleratorLocalId(id), ids.post_id);
// NOTE: for post return value doesn't really matter.
return Shell::Get()->accelerator_controller()->Process(accelerator)
? ui::mojom::EventResult::HANDLED
: ui::mojom::EventResult::UNHANDLED;
}
void AcceleratorControllerRegistrar::OnAcceleratorsRegistered(
const std::vector<ui::Accelerator>& accelerators) {
std::vector<ui::mojom::WmAcceleratorPtr> accelerator_vector;
for (const ui::Accelerator& accelerator : accelerators)
AddAcceleratorToVector(accelerator, accelerator_vector);
window_manager_->window_manager_client()->AddAccelerators(
std::move(accelerator_vector),
base::Bind(OnAcceleratorsAdded, accelerators));
}
void AcceleratorControllerRegistrar::OnAcceleratorUnregistered(
const ui::Accelerator& accelerator) {
auto iter = accelerator_to_ids_.find(accelerator);
DCHECK(iter != accelerator_to_ids_.end());
Ids ids = iter->second;
accelerator_to_ids_.erase(iter);
ids_.erase(ids.pre_id);
ids_.erase(ids.post_id);
DCHECK_EQ(accelerator_to_ids_.size() * 2, ids_.size());
window_manager_->window_manager_client()->RemoveAccelerator(
ComputeAcceleratorId(id_namespace_, ids.pre_id));
window_manager_->window_manager_client()->RemoveAccelerator(
ComputeAcceleratorId(id_namespace_, ids.post_id));
}
void AcceleratorControllerRegistrar::AddAcceleratorToVector(
const ui::Accelerator& accelerator,
std::vector<ui::mojom::WmAcceleratorPtr>& accelerator_vector) {
Ids ids;
if (!GenerateIds(&ids)) {
LOG(ERROR) << "max number of accelerators registered, dropping request";
return;
}
DCHECK_EQ(0u, accelerator_to_ids_.count(accelerator));
accelerator_to_ids_[accelerator] = ids;
DCHECK_EQ(accelerator_to_ids_.size() * 2, ids_.size());
ui::mojom::EventMatcherPtr pre_event_matcher = ui::CreateKeyMatcher(
static_cast<ui::mojom::KeyboardCode>(accelerator.key_code()),
accelerator.modifiers());
pre_event_matcher->accelerator_phase =
ui::mojom::AcceleratorPhase::PRE_TARGET;
pre_event_matcher->type_matcher->type =
accelerator.key_state() == ui::Accelerator::KeyState::PRESSED
? ui::mojom::EventType::KEY_PRESSED
: ui::mojom::EventType::KEY_RELEASED;
ui::mojom::EventMatcherPtr post_event_matcher = pre_event_matcher.Clone();
post_event_matcher->accelerator_phase =
ui::mojom::AcceleratorPhase::POST_TARGET;
accelerator_vector.push_back(
ui::CreateAccelerator(ComputeAcceleratorId(id_namespace_, ids.pre_id),
std::move(pre_event_matcher)));
accelerator_vector.push_back(
ui::CreateAccelerator(ComputeAcceleratorId(id_namespace_, ids.post_id),
std::move(post_event_matcher)));
}
bool AcceleratorControllerRegistrar::GenerateIds(Ids* ids) {
if (ids_.size() + 2 >= std::numeric_limits<uint16_t>::max())
return false;
ids->pre_id = GetNextLocalAcceleratorId();
ids->post_id = GetNextLocalAcceleratorId();
return true;
}
uint16_t AcceleratorControllerRegistrar::GetNextLocalAcceleratorId() {
DCHECK_LT(ids_.size(), std::numeric_limits<uint16_t>::max());
// Common case is we never wrap once, so this is typically cheap. Additionally
// we expect there not to be too many accelerators.
while (ids_.count(next_id_) > 0)
++next_id_;
ids_.insert(next_id_);
return next_id_++;
}
void AcceleratorControllerRegistrar::RegisterWindowCycleAccelerators() {
std::vector<ui::Accelerator> accelerators;
accelerators.push_back(window_cycle_complete_accelerator_);
accelerators.push_back(window_cycle_cancel_accelerator_);
OnAcceleratorsRegistered(accelerators);
}
bool AcceleratorControllerRegistrar::HandleWindowCycleAccelerator(
const ui::Accelerator& accelerator) {
ash::WindowCycleController* window_cycle_controller =
Shell::Get()->window_cycle_controller();
if (!window_cycle_controller->IsCycling())
return false;
if (accelerator == window_cycle_complete_accelerator_) {
window_cycle_controller->CompleteCycling();
return true;
}
if (accelerator == window_cycle_cancel_accelerator_) {
window_cycle_controller->CancelCycling();
return true;
}
return false;
}
} // namespace ash