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// Copyright 2014 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/magnifier_key_scroller.h"
#include <utility>
#include "ash/accelerators/key_hold_detector.h"
#include "ash/ash_switches.h"
#include "ash/magnifier/magnification_controller.h"
#include "ash/shell.h"
#include "base/command_line.h"
#include "ui/events/event.h"
namespace ash {
namespace {
bool magnifier_key_scroller_enabled = false;
}
// static
bool MagnifierKeyScroller::IsEnabled() {
bool has_switch = false;
#if defined(OS_CHROMEOS)
has_switch = base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshEnableMagnifierKeyScroller);
#endif
return (magnifier_key_scroller_enabled || has_switch) &&
ash::Shell::GetInstance()->magnification_controller()->IsEnabled();
}
// static
void MagnifierKeyScroller::SetEnabled(bool enabled) {
magnifier_key_scroller_enabled = enabled;
}
// static
scoped_ptr<ui::EventHandler> MagnifierKeyScroller::CreateHandler() {
scoped_ptr<KeyHoldDetector::Delegate> delegate(new MagnifierKeyScroller());
return scoped_ptr<ui::EventHandler>(new KeyHoldDetector(std::move(delegate)));
}
bool MagnifierKeyScroller::ShouldProcessEvent(const ui::KeyEvent* event) const {
return IsEnabled() &&
(event->key_code() == ui::VKEY_UP ||
event->key_code() == ui::VKEY_DOWN ||
event->key_code() == ui::VKEY_LEFT ||
event->key_code() == ui::VKEY_RIGHT);
}
bool MagnifierKeyScroller::IsStartEvent(const ui::KeyEvent* event) const {
return event->type() == ui::ET_KEY_PRESSED &&
event->flags() & ui::EF_SHIFT_DOWN;
}
bool MagnifierKeyScroller::ShouldStopEventPropagation() const {
return true;
}
void MagnifierKeyScroller::OnKeyHold(const ui::KeyEvent* event) {
MagnificationController* controller =
Shell::GetInstance()->magnification_controller();
switch (event->key_code()) {
case ui::VKEY_UP:
controller->SetScrollDirection(MagnificationController::SCROLL_UP);
break;
case ui::VKEY_DOWN:
controller->SetScrollDirection(MagnificationController::SCROLL_DOWN);
break;
case ui::VKEY_LEFT:
controller->SetScrollDirection(MagnificationController::SCROLL_LEFT);
break;
case ui::VKEY_RIGHT:
controller->SetScrollDirection(MagnificationController::SCROLL_RIGHT);
break;
default:
NOTREACHED() << "Unknown keyboard_code:" << event->key_code();
}
}
void MagnifierKeyScroller::OnKeyUnhold(const ui::KeyEvent* event) {
MagnificationController* controller =
Shell::GetInstance()->magnification_controller();
controller->SetScrollDirection(MagnificationController::SCROLL_NONE);
}
MagnifierKeyScroller::MagnifierKeyScroller() {}
MagnifierKeyScroller::~MagnifierKeyScroller() {}
} // namespace ash
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