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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/magnifier_key_scroller.h"
#include <utility>
#include "ash/accelerators/key_hold_detector.h"
#include "ash/accessibility/magnifier/fullscreen_magnifier_controller.h"
#include "ash/constants/ash_switches.h"
#include "ash/keyboard/keyboard_util.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 = base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kAshEnableMagnifierKeyScroller);
return (magnifier_key_scroller_enabled || has_switch) &&
Shell::Get()->fullscreen_magnifier_controller()->IsEnabled();
}
// static
void MagnifierKeyScroller::SetEnabled(bool enabled) {
magnifier_key_scroller_enabled = enabled;
}
// static
std::unique_ptr<ui::EventHandler> MagnifierKeyScroller::CreateHandler() {
// Uses `new` due to private constructor.
std::unique_ptr<KeyHoldDetector::Delegate> delegate(
new MagnifierKeyScroller());
return std::make_unique<KeyHoldDetector>(std::move(delegate));
}
bool MagnifierKeyScroller::ShouldProcessEvent(const ui::KeyEvent* event) const {
return IsEnabled() && keyboard_util::IsArrowKeyCode(event->key_code());
}
bool MagnifierKeyScroller::IsStartEvent(const ui::KeyEvent* event) const {
return event->type() == ui::EventType::kKeyPressed &&
event->flags() & ui::EF_SHIFT_DOWN;
}
bool MagnifierKeyScroller::ShouldStopEventPropagation() const {
return true;
}
void MagnifierKeyScroller::OnKeyHold(const ui::KeyEvent* event) {
FullscreenMagnifierController* controller =
Shell::Get()->fullscreen_magnifier_controller();
switch (event->key_code()) {
case ui::VKEY_UP:
controller->SetScrollDirection(FullscreenMagnifierController::SCROLL_UP);
break;
case ui::VKEY_DOWN:
controller->SetScrollDirection(
FullscreenMagnifierController::SCROLL_DOWN);
break;
case ui::VKEY_LEFT:
controller->SetScrollDirection(
FullscreenMagnifierController::SCROLL_LEFT);
break;
case ui::VKEY_RIGHT:
controller->SetScrollDirection(
FullscreenMagnifierController::SCROLL_RIGHT);
break;
default:
NOTREACHED() << "Unknown keyboard_code:" << event->key_code();
}
}
void MagnifierKeyScroller::OnKeyUnhold(const ui::KeyEvent* event) {
FullscreenMagnifierController* controller =
Shell::Get()->fullscreen_magnifier_controller();
controller->SetScrollDirection(FullscreenMagnifierController::SCROLL_NONE);
}
MagnifierKeyScroller::MagnifierKeyScroller() = default;
MagnifierKeyScroller::~MagnifierKeyScroller() = default;
} // namespace ash
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