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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ash/accelerators/pre_target_accelerator_handler.h"
#include "ash/accelerators/accelerator_controller_impl.h"
#include "ash/shell.h"
#include "ash/wm/window_state.h"
#include "base/containers/contains.h"
#include "base/feature_list.h"
#include "ui/aura/window.h"
#include "ui/base/accelerators/accelerator.h"
#include "ui/events/event.h"
#include "ui/wm/core/window_util.h"
namespace ash {
PreTargetAcceleratorHandler::PreTargetAcceleratorHandler() = default;
PreTargetAcceleratorHandler::~PreTargetAcceleratorHandler() = default;
bool PreTargetAcceleratorHandler::ProcessAccelerator(
const ui::KeyEvent& key_event,
const ui::Accelerator& accelerator) {
aura::Window* target = static_cast<aura::Window*>(key_event.target());
// Callers should never supply null.
DCHECK(target);
// Special hardware keys like brightness and volume are handled in
// special way. However, some windows can override this behavior
// (e.g. Chrome v1 apps by default and Chrome v2 apps with
// permission) by setting a window property.
if (AcceleratorController::IsSystemKey(key_event.key_code()) &&
!CanConsumeSystemKeys(target, key_event)) {
// System keys are always consumed regardless of whether they trigger an
// accelerator to prevent windows from seeing unexpected key up events.
Shell::Get()->accelerator_controller()->Process(accelerator);
return true;
}
if (!ShouldProcessAcceleratorNow(target, key_event, accelerator))
return false;
return Shell::Get()->accelerator_controller()->Process(accelerator);
}
bool PreTargetAcceleratorHandler::CanConsumeSystemKeys(
aura::Window* target,
const ui::KeyEvent& event) {
// Uses the top level window so if the target is a web contents window the
// containing parent window will be checked for the property.
aura::Window* top_level = ::wm::GetToplevelWindow(target);
return top_level && WindowState::Get(top_level)->CanConsumeSystemKeys();
}
bool PreTargetAcceleratorHandler::ShouldProcessAcceleratorNow(
aura::Window* target,
const ui::KeyEvent& event,
const ui::Accelerator& accelerator) {
// Callers should never supply null.
DCHECK(target);
// On ChromeOS, If the accelerator is Search+<key(s)> then it must never be
// intercepted by apps or windows.
if (accelerator.IsCmdDown())
return true;
if (base::Contains(Shell::GetAllRootWindows(), target))
return true;
AcceleratorControllerImpl* accelerator_controller =
Shell::Get()->accelerator_controller();
// Reserved accelerators (such as Power button) always have a priority.
if (accelerator_controller->IsReserved(accelerator))
return true;
// A full screen window has a right to handle all key events including the
// reserved ones.
aura::Window* top_level = ::wm::GetToplevelWindow(target);
if (top_level && WindowState::Get(top_level)->IsFullscreen()) {
// On ChromeOS, fullscreen windows are either browser or apps, which
// send key events to a web content first, then will process keys
// if the web content didn't consume them.
return false;
}
// Handle preferred accelerators (such as ALT-TAB) before sending
// to the target.
return accelerator_controller->IsPreferred(accelerator);
}
} // namespace ash
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