Add key based scrolling on magnified screen for kiosk mode.

ash/accelerators/accelerator_controller.cc

 // Copyright (c) 2012 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.h"
 
 #include <algorithm>
 #include <cmath>
 #include <iostream>
 #include <string>
@@ skipping 218 matching lines @@
   } else if (ash::Shell::GetInstance()->
              partial_magnification_controller()->is_enabled()) {
     float scale = delta_index > 0 ? kDefaultPartialMagnifiedScale : 1;
     ash::Shell::GetInstance()->partial_magnification_controller()->
         SetScale(scale);
   }
 
   return true;
 }
 
+bool HandleMagnifyScreenScroll(
+    MagnificationController::ScrollDirection direction) {
+  MagnificationController* controller =
+      ash::Shell::GetInstance()->magnification_controller();
+  if (controller->IsEnabled()) {
+    controller->SetScrollDirection(direction);
+    return true;
+  }
+  return false;
+}
+
 bool HandleMediaNextTrack() {
   Shell::GetInstance()->media_delegate()->HandleMediaNextTrack();
   return true;
 }
 
 bool HandleMediaPlayPause() {
   Shell::GetInstance()->media_delegate()->HandleMediaPlayPause();
   return true;
 }
 
@@ skipping 542 matching lines @@
     actions_allowed_at_login_screen_.insert(
         kActionsAllowedAtLoginOrLockScreen[i]);
     actions_allowed_at_lock_screen_.insert(
         kActionsAllowedAtLoginOrLockScreen[i]);
   }
   for (size_t i = 0; i < kActionsAllowedAtLockScreenLength; ++i)
     actions_allowed_at_lock_screen_.insert(kActionsAllowedAtLockScreen[i]);
   for (size_t i = 0; i < kActionsAllowedAtModalWindowLength; ++i)
     actions_allowed_at_modal_window_.insert(kActionsAllowedAtModalWindow[i]);
   for (size_t i = 0; i < kReservedActionsLength; ++i)
-    reserved_actions_.insert(kReservedActions[i]);
+    AddReservedAction(kReservedActions[i]);
   for (size_t i = 0; i < kNonrepeatableActionsLength; ++i)
     nonrepeatable_actions_.insert(kNonrepeatableActions[i]);
   for (size_t i = 0; i < kActionsAllowedInAppModeLength; ++i)
     actions_allowed_in_app_mode_.insert(kActionsAllowedInAppMode[i]);
   for (size_t i = 0; i < kActionsNeedingWindowLength; ++i)
     actions_needing_window_.insert(kActionsNeedingWindow[i]);
 
   RegisterAccelerators(kAcceleratorData, kAcceleratorDataLength);
 
 #if !defined(NDEBUG)
   RegisterAccelerators(kDesktopAcceleratorData, kDesktopAcceleratorDataLength);
 #endif
 
   if (DebugShortcutsEnabled()) {
     RegisterAccelerators(kDebugAcceleratorData, kDebugAcceleratorDataLength);
     for (size_t i = 0; i < kReservedDebugActionsLength; ++i)
-      reserved_actions_.insert(kReservedDebugActions[i]);
+      AddReservedAction(kReservedDebugActions[i]);
   }
 
 #if defined(OS_CHROMEOS)
   keyboard_brightness_control_delegate_.reset(
       new KeyboardBrightnessController());
 #endif
 }
 
+void AcceleratorController::InstallMagnifierAccelerators() {
+  RegisterAccelerators(kMagnifierAcceleratorData,
+                       kMagnifierAcceleratorDataLength);
+  for (size_t i = 0; i < kMagnifierAcceleratorDataLength; i++)
+    AddReservedAction(kMagnifierAcceleratorData[i].action);
+}
+
+void AcceleratorController::UninstallMagnifierAccelerators() {
+  UnregisterAccelerators(kMagnifierAcceleratorData,
+                         kMagnifierAcceleratorDataLength);
+  for (size_t i = 0; i < kMagnifierAcceleratorDataLength; i++)
+    RemoveReservedAction(kMagnifierAcceleratorData[i].action);
+}
+
 void AcceleratorController::Register(const ui::Accelerator& accelerator,
                                      ui::AcceleratorTarget* target) {
   accelerator_manager_->Register(accelerator,
                                  ui::AcceleratorManager::kNormalPriority,
                                  target);
 }
 
 void AcceleratorController::Unregister(const ui::Accelerator& accelerator,
                                        ui::AcceleratorTarget* target) {
   accelerator_manager_->Unregister(accelerator, target);
@@ skipping 273 matching lines @@
     case DEBUG_TOGGLE_SHOW_FPS_COUNTER:
       ash::debug::ToggleShowFpsCounter();
       return true;
     case DEBUG_TOGGLE_SHOW_PAINT_RECTS:
       ash::debug::ToggleShowPaintRects();
       return true;
     case MAGNIFY_SCREEN_ZOOM_IN:
       return HandleMagnifyScreen(1);
     case MAGNIFY_SCREEN_ZOOM_OUT:
       return HandleMagnifyScreen(-1);
+    case MAGNIFY_SCREEN_UP:
+      return HandleMagnifyScreenScroll(MagnificationController::SCROLL_UP);
+    case MAGNIFY_SCREEN_DOWN:
+      return HandleMagnifyScreenScroll(MagnificationController::SCROLL_DOWN);
+    case MAGNIFY_SCREEN_LEFT:
+      return HandleMagnifyScreenScroll(MagnificationController::SCROLL_LEFT);
+    case MAGNIFY_SCREEN_RIGHT:
+      return HandleMagnifyScreenScroll(MagnificationController::SCROLL_RIGHT);
+    case MAGNIFY_SCREEN_STOP_SCROLL:
+      return HandleMagnifyScreenScroll(MagnificationController::SCROLL_NONE);
     case MEDIA_NEXT_TRACK:
       return HandleMediaNextTrack();
     case MEDIA_PLAY_PAUSE:
        return HandleMediaPlayPause();
     case MEDIA_PREV_TRACK:
        return HandleMediaPrevTrack();
     case POWER_PRESSED:  // fallthrough
     case POWER_RELEASED:
 #if defined(OS_CHROMEOS)
       if (!base::SysInfo::IsRunningOnChromeOS()) {
@@ skipping 64 matching lines @@
     ui::Accelerator accelerator(accelerators[i].keycode,
                                 accelerators[i].modifiers);
     accelerator.set_type(accelerators[i].trigger_on_press ?
                          ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED);
     Register(accelerator, this);
     accelerators_.insert(
         std::make_pair(accelerator, accelerators[i].action));
   }
 }
 
+void AcceleratorController::UnregisterAccelerators(
+    const AcceleratorData accelerators[],
+    size_t accelerators_length) {
+  for (size_t i = 0; i < accelerators_length; ++i) {
+    ui::Accelerator accelerator(accelerators[i].keycode,
+                                accelerators[i].modifiers);
+    accelerator.set_type(accelerators[i].trigger_on_press ?
+                         ui::ET_KEY_PRESSED : ui::ET_KEY_RELEASED);
+    Unregister(accelerator, this);
+    std::map<ui::Accelerator, int>::const_iterator it =
+        accelerators_.find(accelerator);
+    DCHECK(it != accelerators_.end());
+    accelerators_.erase(it);
+  }
+}
+
+void AcceleratorController::AddReservedAction(AcceleratorAction action) {
+  if (reserved_actions_.find(action) == reserved_actions_.end())
+    reserved_actions_.insert(action);
+}
+
+void AcceleratorController::RemoveReservedAction(AcceleratorAction action) {
+  std::set<int>::const_iterator it = reserved_actions_.find(action);
+  if (it != reserved_actions_.end())
+    reserved_actions_.erase(it);
+}
+
 void AcceleratorController::SetKeyboardBrightnessControlDelegate(
     scoped_ptr<KeyboardBrightnessControlDelegate>
     keyboard_brightness_control_delegate) {
   keyboard_brightness_control_delegate_ =
       keyboard_brightness_control_delegate.Pass();
 }
 
 bool AcceleratorController::CanHandleAccelerators() const {
   return true;
 }
 
 }  // namespace ash