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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ash/accelerators/magnifier_key_scroller.h"
      6 
      7 #include "ash/accelerators/key_hold_detector.h"
      8 #include "ash/ash_switches.h"
      9 #include "ash/magnifier/magnification_controller.h"
     10 #include "ash/shell.h"
     11 #include "base/command_line.h"
     12 
     13 namespace ash {
     14 namespace {
     15 bool magnifier_key_scroller_enabled = false;
     16 }
     17 
     18 // static
     19 bool MagnifierKeyScroller::IsEnabled() {
     20   bool has_switch = false;
     21 #if defined(OS_CHROMEOS)
     22   has_switch = CommandLine::ForCurrentProcess()->HasSwitch(
     23       switches::kAshEnableMagnifierKeyScroller);
     24 #endif
     25 
     26   return (magnifier_key_scroller_enabled || has_switch) &&
     27       ash::Shell::GetInstance()->magnification_controller()->IsEnabled();
     28 }
     29 
     30 // static
     31 void MagnifierKeyScroller::SetEnabled(bool enabled) {
     32   magnifier_key_scroller_enabled = enabled;
     33 }
     34 
     35 // static
     36 scoped_ptr<ui::EventHandler> MagnifierKeyScroller::CreateHandler() {
     37   scoped_ptr<KeyHoldDetector::Delegate> delegate(new MagnifierKeyScroller());
     38   return scoped_ptr<ui::EventHandler>(new KeyHoldDetector(delegate.Pass()));
     39 }
     40 
     41 bool MagnifierKeyScroller::ShouldProcessEvent(const ui::KeyEvent* event) const {
     42   return IsEnabled() &&
     43       (event->key_code() == ui::VKEY_UP ||
     44        event->key_code() == ui::VKEY_DOWN ||
     45        event->key_code() == ui::VKEY_LEFT ||
     46        event->key_code() == ui::VKEY_RIGHT);
     47 }
     48 
     49 bool MagnifierKeyScroller::IsStartEvent(const ui::KeyEvent* event) const {
     50   return event->type() == ui::ET_KEY_PRESSED &&
     51       event->flags() & ui::EF_SHIFT_DOWN;
     52 }
     53 
     54 void MagnifierKeyScroller::OnKeyHold(const ui::KeyEvent* event) {
     55   MagnificationController* controller =
     56       Shell::GetInstance()->magnification_controller();
     57   switch (event->key_code()) {
     58     case ui::VKEY_UP:
     59       controller->SetScrollDirection(MagnificationController::SCROLL_UP);
     60       break;
     61     case ui::VKEY_DOWN:
     62       controller->SetScrollDirection(MagnificationController::SCROLL_DOWN);
     63       break;
     64     case ui::VKEY_LEFT:
     65       controller->SetScrollDirection(MagnificationController::SCROLL_LEFT);
     66       break;
     67     case ui::VKEY_RIGHT:
     68       controller->SetScrollDirection(MagnificationController::SCROLL_RIGHT);
     69       break;
     70     default:
     71       NOTREACHED() << "Unknown keyboard_code:" << event->key_code();
     72   }
     73 }
     74 
     75 void MagnifierKeyScroller::OnKeyUnhold(const ui::KeyEvent* event) {
     76   MagnificationController* controller =
     77       Shell::GetInstance()->magnification_controller();
     78   controller->SetScrollDirection(MagnificationController::SCROLL_NONE);
     79 }
     80 
     81 MagnifierKeyScroller::MagnifierKeyScroller() {}
     82 
     83 MagnifierKeyScroller::~MagnifierKeyScroller() {}
     84 
     85 }  // namespace ash
     86