ash/accelerators/exit_warning_handler.cc

   1 // Copyright 2013 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/exit_warning_handler.h"
   6
   7 #include "ash/metrics/user_metrics_recorder.h"
   8 #include "ash/shell.h"
   9 #include "ash/shell_delegate.h"
  10 #include "ash/shell_window_ids.h"
  11 #include "base/strings/utf_string_conversions.h"
  12 #include "base/time/time.h"
  13 #include "base/timer/timer.h"
  14 #include "grit/ash_strings.h"
  15 #include "ui/accessibility/ax_view_state.h"
  16 #include "ui/aura/window.h"
  17 #include "ui/base/l10n/l10n_util.h"
  18 #include "ui/base/resource/resource_bundle.h"
  19 #include "ui/gfx/canvas.h"
  20 #include "ui/gfx/font_list.h"
  21 #include "ui/gfx/text_utils.h"
  22 #include "ui/views/controls/label.h"
  23 #include "ui/views/layout/fill_layout.h"
  24 #include "ui/views/view.h"
  25 #include "ui/views/widget/widget.h"
  26 #include "ui/views/widget/widget_delegate.h"
  27
  28 namespace ash {
  29 namespace {
  30
  31 const int64 kTimeOutMilliseconds = 2000;
  32 // Color of the text of the warning message.
  33 const SkColor kTextColor = SK_ColorWHITE;
  34 // Color of the window background.
  35 const SkColor kWindowBackgroundColor = SkColorSetARGB(0xC0, 0x0, 0x0, 0x0);
  36 // Radius of the rounded corners of the window.
  37 const int kWindowCornerRadius = 2;
  38 const int kHorizontalMarginAroundText = 100;
  39 const int kVerticalMarginAroundText = 100;
  40
  41 class ExitWarningWidgetDelegateView : public views::WidgetDelegateView {
  42  public:
  43   ExitWarningWidgetDelegateView() : text_width_(0), width_(0), height_(0) {
  44 #ifdef OS_CHROMEOS
  45     text_ = l10n_util::GetStringUTF16(IDS_ASH_SIGN_OUT_WARNING_POPUP_TEXT);
  46     accessible_name_ = l10n_util::GetStringUTF16(
  47         IDS_ASH_SIGN_OUT_WARNING_POPUP_TEXT_ACCESSIBLE);
  48 #else
  49     text_ = l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT);
  50     accessible_name_ =
  51         l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT_ACCESSIBLE);
  52 #endif
  53     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  54     const gfx::FontList& font_list =
  55         rb.GetFontList(ui::ResourceBundle::LargeFont);
  56     text_width_ = gfx::GetStringWidth(text_, font_list);
  57     width_ = text_width_ + kHorizontalMarginAroundText;
  58     height_ = font_list.GetHeight() + kVerticalMarginAroundText;
  59     views::Label* label = new views::Label();
  60     label->SetText(text_);
  61     label->SetHorizontalAlignment(gfx::ALIGN_CENTER);
  62     label->SetFontList(font_list);
  63     label->SetEnabledColor(kTextColor);
  64     label->SetDisabledColor(kTextColor);
  65     label->SetAutoColorReadabilityEnabled(false);
  66     label->SetSubpixelRenderingEnabled(false);
  67     AddChildView(label);
  68     SetLayoutManager(new views::FillLayout);
  69   }
  70
  71   virtual gfx::Size GetPreferredSize() const OVERRIDE {
  72     return gfx::Size(width_, height_);
  73   }
  74
  75   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
  76     SkPaint paint;
  77     paint.setStyle(SkPaint::kFill_Style);
  78     paint.setColor(kWindowBackgroundColor);
  79     canvas->DrawRoundRect(GetLocalBounds(), kWindowCornerRadius, paint);
  80     views::WidgetDelegateView::OnPaint(canvas);
  81   }
  82
  83   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE {
  84     state->name = accessible_name_;
  85     state->role = ui::AX_ROLE_ALERT;
  86   }
  87
  88  private:
  89   base::string16 text_;
  90   base::string16 accessible_name_;
  91   int text_width_;
  92   int width_;
  93   int height_;
  94
  95   DISALLOW_COPY_AND_ASSIGN(ExitWarningWidgetDelegateView);
  96 };
  97
  98 }  // namespace
  99
 100 ExitWarningHandler::ExitWarningHandler()
 101     : state_(IDLE),
 102       stub_timer_for_test_(false) {
 103 }
 104
 105 ExitWarningHandler::~ExitWarningHandler() {
 106   // Note: If a timer is outstanding, it is stopped in its destructor.
 107   Hide();
 108 }
 109
 110 void ExitWarningHandler::HandleAccelerator() {
 111   ShellDelegate* shell_delegate = Shell::GetInstance()->delegate();
 112   switch (state_) {
 113     case IDLE:
 114       state_ = WAIT_FOR_DOUBLE_PRESS;
 115       Show();
 116       StartTimer();
 117       Shell::GetInstance()->
 118           metrics()->RecordUserMetricsAction(UMA_ACCEL_EXIT_FIRST_Q);
 119       break;
 120     case WAIT_FOR_DOUBLE_PRESS:
 121       state_ = EXITING;
 122       CancelTimer();
 123       Hide();
 124       Shell::GetInstance()->
 125           metrics()->RecordUserMetricsAction(UMA_ACCEL_EXIT_SECOND_Q);
 126       shell_delegate->Exit();
 127       break;
 128     case EXITING:
 129       break;
 130     default:
 131       NOTREACHED();
 132       break;
 133   }
 134 }
 135
 136 void ExitWarningHandler::TimerAction() {
 137   Hide();
 138   if (state_ == WAIT_FOR_DOUBLE_PRESS)
 139     state_ = IDLE;
 140 }
 141
 142 void ExitWarningHandler::StartTimer() {
 143   if (stub_timer_for_test_)
 144     return;
 145   timer_.Start(FROM_HERE,
 146                base::TimeDelta::FromMilliseconds(kTimeOutMilliseconds),
 147                this,
 148                &ExitWarningHandler::TimerAction);
 149 }
 150
 151 void ExitWarningHandler::CancelTimer() {
 152   timer_.Stop();
 153 }
 154
 155 void ExitWarningHandler::Show() {
 156   if (widget_)
 157     return;
 158   aura::Window* root_window = Shell::GetTargetRootWindow();
 159   ExitWarningWidgetDelegateView* delegate = new ExitWarningWidgetDelegateView;
 160   gfx::Size rs = root_window->bounds().size();
 161   gfx::Size ps = delegate->GetPreferredSize();
 162   gfx::Rect bounds((rs.width() - ps.width()) / 2,
 163                    (rs.height() - ps.height()) / 3,
 164                    ps.width(), ps.height());
 165   views::Widget::InitParams params;
 166   params.type = views::Widget::InitParams::TYPE_POPUP;
 167   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 168   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 169   params.accept_events = false;
 170   params.keep_on_top = true;
 171   params.remove_standard_frame = true;
 172   params.delegate = delegate;
 173   params.bounds = bounds;
 174   params.parent =
 175       Shell::GetContainer(root_window, kShellWindowId_SettingBubbleContainer);
 176   widget_.reset(new views::Widget);
 177   widget_->Init(params);
 178   widget_->SetContentsView(delegate);
 179   widget_->GetNativeView()->SetName("ExitWarningWindow");
 180   widget_->Show();
 181
 182   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 183 }
 184
 185 void ExitWarningHandler::Hide() {
 186   widget_.reset();
 187 }
 188
 189 }  // namespace ash