src/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 ExitWarningLabel : public views::Label {
  42  public:
  43   ExitWarningLabel() {}
  44
  45   virtual ~ExitWarningLabel() {}
  46
  47  private:
  48   virtual void PaintText(gfx::Canvas* canvas,
  49                          const base::string16& text,
  50                          const gfx::Rect& text_bounds,
  51                          int flags) OVERRIDE {
  52     // Turn off subpixel rendering.
  53     views::Label::PaintText(canvas,
  54                             text,
  55                             text_bounds,
  56                             flags | gfx::Canvas::NO_SUBPIXEL_RENDERING);
  57   }
  58
  59   DISALLOW_COPY_AND_ASSIGN(ExitWarningLabel);
  60 };
  61
  62 class ExitWarningWidgetDelegateView : public views::WidgetDelegateView {
  63  public:
  64   ExitWarningWidgetDelegateView() : text_width_(0), width_(0), height_(0) {
  65     text_ = l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT);
  66     accessible_name_ =
  67         l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT_ACCESSIBLE);
  68     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  69     const gfx::FontList& font_list =
  70         rb.GetFontList(ui::ResourceBundle::LargeFont);
  71     text_width_ = gfx::GetStringWidth(text_, font_list);
  72     width_ = text_width_ + kHorizontalMarginAroundText;
  73     height_ = font_list.GetHeight() + kVerticalMarginAroundText;
  74     views::Label* label = new ExitWarningLabel;
  75     label->SetText(text_);
  76     label->SetHorizontalAlignment(gfx::ALIGN_CENTER);
  77     label->SetFontList(font_list);
  78     label->SetEnabledColor(kTextColor);
  79     label->SetDisabledColor(kTextColor);
  80     label->SetAutoColorReadabilityEnabled(false);
  81     AddChildView(label);
  82     SetLayoutManager(new views::FillLayout);
  83   }
  84
  85   virtual gfx::Size GetPreferredSize() OVERRIDE {
  86     return gfx::Size(width_, height_);
  87   }
  88
  89   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
  90     SkPaint paint;
  91     paint.setStyle(SkPaint::kFill_Style);
  92     paint.setColor(kWindowBackgroundColor);
  93     canvas->DrawRoundRect(GetLocalBounds(), kWindowCornerRadius, paint);
  94     views::WidgetDelegateView::OnPaint(canvas);
  95   }
  96
  97   virtual void GetAccessibleState(ui::AXViewState* state) OVERRIDE {
  98     state->name = accessible_name_;
  99     state->role = ui::AX_ROLE_ALERT;
 100   }
 101
 102  private:
 103   base::string16 text_;
 104   base::string16 accessible_name_;
 105   int text_width_;
 106   int width_;
 107   int height_;
 108
 109   DISALLOW_COPY_AND_ASSIGN(ExitWarningWidgetDelegateView);
 110 };
 111
 112 }  // namespace
 113
 114 ExitWarningHandler::ExitWarningHandler()
 115     : state_(IDLE),
 116       stub_timer_for_test_(false) {
 117 }
 118
 119 ExitWarningHandler::~ExitWarningHandler() {
 120   // Note: If a timer is outstanding, it is stopped in its destructor.
 121   Hide();
 122 }
 123
 124 void ExitWarningHandler::HandleAccelerator() {
 125   ShellDelegate* shell_delegate = Shell::GetInstance()->delegate();
 126   switch (state_) {
 127     case IDLE:
 128       state_ = WAIT_FOR_DOUBLE_PRESS;
 129       Show();
 130       StartTimer();
 131       Shell::GetInstance()->
 132           metrics()->RecordUserMetricsAction(UMA_ACCEL_EXIT_FIRST_Q);
 133       break;
 134     case WAIT_FOR_DOUBLE_PRESS:
 135       state_ = EXITING;
 136       CancelTimer();
 137       Hide();
 138       Shell::GetInstance()->
 139           metrics()->RecordUserMetricsAction(UMA_ACCEL_EXIT_SECOND_Q);
 140       shell_delegate->Exit();
 141       break;
 142     case EXITING:
 143       break;
 144     default:
 145       NOTREACHED();
 146       break;
 147   }
 148 }
 149
 150 void ExitWarningHandler::TimerAction() {
 151   Hide();
 152   if (state_ == WAIT_FOR_DOUBLE_PRESS)
 153     state_ = IDLE;
 154 }
 155
 156 void ExitWarningHandler::StartTimer() {
 157   if (stub_timer_for_test_)
 158     return;
 159   timer_.Start(FROM_HERE,
 160                base::TimeDelta::FromMilliseconds(kTimeOutMilliseconds),
 161                this,
 162                &ExitWarningHandler::TimerAction);
 163 }
 164
 165 void ExitWarningHandler::CancelTimer() {
 166   timer_.Stop();
 167 }
 168
 169 void ExitWarningHandler::Show() {
 170   if (widget_)
 171     return;
 172   aura::Window* root_window = Shell::GetTargetRootWindow();
 173   ExitWarningWidgetDelegateView* delegate = new ExitWarningWidgetDelegateView;
 174   gfx::Size rs = root_window->bounds().size();
 175   gfx::Size ps = delegate->GetPreferredSize();
 176   gfx::Rect bounds((rs.width() - ps.width()) / 2,
 177                    (rs.height() - ps.height()) / 3,
 178                    ps.width(), ps.height());
 179   views::Widget::InitParams params;
 180   params.type = views::Widget::InitParams::TYPE_POPUP;
 181   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 182   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 183   params.accept_events = false;
 184   params.can_activate = false;
 185   params.keep_on_top = true;
 186   params.remove_standard_frame = true;
 187   params.delegate = delegate;
 188   params.bounds = bounds;
 189   params.parent =
 190       Shell::GetContainer(root_window, kShellWindowId_SettingBubbleContainer);
 191   widget_.reset(new views::Widget);
 192   widget_->Init(params);
 193   widget_->SetContentsView(delegate);
 194   widget_->GetNativeView()->SetName("ExitWarningWindow");
 195   widget_->Show();
 196
 197   delegate->NotifyAccessibilityEvent(ui::AX_EVENT_ALERT, true);
 198 }
 199
 200 void ExitWarningHandler::Hide() {
 201   widget_.reset();
 202 }
 203
 204 }  // namespace ash