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/shell.h"
   8 #include "ash/shell_delegate.h"
   9 #include "ash/shell_window_ids.h"
  10 #include "base/strings/utf_string_conversions.h"
  11 #include "base/time/time.h"
  12 #include "base/timer/timer.h"
  13 #include "grit/ash_strings.h"
  14 #include "ui/aura/window.h"
  15 #include "ui/base/accessibility/accessible_view_state.h"
  16 #include "ui/base/l10n/l10n_util.h"
  17 #include "ui/base/resource/resource_bundle.h"
  18 #include "ui/gfx/canvas.h"
  19 #include "ui/gfx/font.h"
  20 #include "ui/views/controls/label.h"
  21 #include "ui/views/layout/fill_layout.h"
  22 #include "ui/views/view.h"
  23 #include "ui/views/widget/widget.h"
  24 #include "ui/views/widget/widget_delegate.h"
  25
  26 namespace ash {
  27 namespace {
  28
  29 const int64 kTimeOutMilliseconds = 2000;
  30 // Color of the text of the warning message.
  31 const SkColor kTextColor = SK_ColorWHITE;
  32 // Color of the window background.
  33 const SkColor kWindowBackgroundColor = SkColorSetARGB(0xC0, 0x0, 0x0, 0x0);
  34 // Radius of the rounded corners of the window.
  35 const int kWindowCornerRadius = 2;
  36 const int kHorizontalMarginAroundText = 100;
  37 const int kVerticalMarginAroundText = 100;
  38
  39 class ExitWarningLabel : public views::Label {
  40  public:
  41   ExitWarningLabel() {}
  42
  43   virtual ~ExitWarningLabel() {}
  44
  45  private:
  46   virtual void PaintText(gfx::Canvas* canvas,
  47                          const string16& text,
  48                          const gfx::Rect& text_bounds,
  49                          int flags) OVERRIDE {
  50     // Turn off subpixel rendering.
  51     views::Label::PaintText(canvas,
  52                             text,
  53                             text_bounds,
  54                             flags | gfx::Canvas::NO_SUBPIXEL_RENDERING);
  55   }
  56
  57   DISALLOW_COPY_AND_ASSIGN(ExitWarningLabel);
  58 };
  59
  60 class ExitWarningWidgetDelegateView : public views::WidgetDelegateView {
  61  public:
  62   ExitWarningWidgetDelegateView() : text_width_(0), width_(0), height_(0) {
  63     text_ = l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT);
  64     accessible_name_ =
  65         l10n_util::GetStringUTF16(IDS_ASH_EXIT_WARNING_POPUP_TEXT_ACCESSIBLE);
  66     ui::ResourceBundle& rb = ui::ResourceBundle::GetSharedInstance();
  67     font_ = rb.GetFont(ui::ResourceBundle::LargeFont);
  68     text_width_ = font_.GetStringWidth(text_);
  69     width_ = text_width_ + kHorizontalMarginAroundText;
  70     height_ = font_.GetHeight() + kVerticalMarginAroundText;
  71     views::Label* label = new ExitWarningLabel;
  72     label->SetText(text_);
  73     label->SetHorizontalAlignment(gfx::ALIGN_CENTER);
  74     label->SetFont(font_);
  75     label->SetEnabledColor(kTextColor);
  76     label->SetDisabledColor(kTextColor);
  77     label->SetAutoColorReadabilityEnabled(false);
  78     AddChildView(label);
  79     SetLayoutManager(new views::FillLayout);
  80   }
  81
  82   virtual gfx::Size GetPreferredSize() OVERRIDE {
  83     return gfx::Size(width_, height_);
  84   }
  85
  86   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE {
  87     SkPaint paint;
  88     paint.setStyle(SkPaint::kFill_Style);
  89     paint.setColor(kWindowBackgroundColor);
  90     canvas->DrawRoundRect(GetLocalBounds(), kWindowCornerRadius, paint);
  91     views::WidgetDelegateView::OnPaint(canvas);
  92   }
  93
  94   virtual void GetAccessibleState(ui::AccessibleViewState* state) OVERRIDE {
  95     state->name = accessible_name_;
  96     state->role = ui::AccessibilityTypes::ROLE_ALERT;
  97   }
  98
  99  private:
 100   base::string16 text_;
 101   base::string16 accessible_name_;
 102   gfx::Font font_;
 103   int text_width_;
 104   int width_;
 105   int height_;
 106
 107   DISALLOW_COPY_AND_ASSIGN(ExitWarningWidgetDelegateView);
 108 };
 109
 110 }  // namespace
 111
 112 ExitWarningHandler::ExitWarningHandler()
 113     : state_(IDLE),
 114       stub_timer_for_test_(false) {
 115 }
 116
 117 ExitWarningHandler::~ExitWarningHandler() {
 118   // Note: If a timer is outstanding, it is stopped in its destructor.
 119   Hide();
 120 }
 121
 122 void ExitWarningHandler::HandleAccelerator() {
 123   ShellDelegate* shell_delegate = Shell::GetInstance()->delegate();
 124   switch (state_) {
 125     case IDLE:
 126       state_ = WAIT_FOR_DOUBLE_PRESS;
 127       Show();
 128       StartTimer();
 129       shell_delegate->RecordUserMetricsAction(UMA_ACCEL_EXIT_FIRST_Q);
 130       break;
 131     case WAIT_FOR_DOUBLE_PRESS:
 132       state_ = EXITING;
 133       CancelTimer();
 134       Hide();
 135       shell_delegate->RecordUserMetricsAction(UMA_ACCEL_EXIT_SECOND_Q);
 136       shell_delegate->Exit();
 137       break;
 138     case EXITING:
 139       break;
 140     default:
 141       NOTREACHED();
 142       break;
 143   }
 144 }
 145
 146 void ExitWarningHandler::TimerAction() {
 147   Hide();
 148   if (state_ == WAIT_FOR_DOUBLE_PRESS)
 149     state_ = IDLE;
 150 }
 151
 152 void ExitWarningHandler::StartTimer() {
 153   if (stub_timer_for_test_)
 154     return;
 155   timer_.Start(FROM_HERE,
 156                base::TimeDelta::FromMilliseconds(kTimeOutMilliseconds),
 157                this,
 158                &ExitWarningHandler::TimerAction);
 159 }
 160
 161 void ExitWarningHandler::CancelTimer() {
 162   timer_.Stop();
 163 }
 164
 165 void ExitWarningHandler::Show() {
 166   if (widget_)
 167     return;
 168   aura::Window* root_window = Shell::GetTargetRootWindow();
 169   ExitWarningWidgetDelegateView* delegate = new ExitWarningWidgetDelegateView;
 170   gfx::Size rs = root_window->bounds().size();
 171   gfx::Size ps = delegate->GetPreferredSize();
 172   gfx::Rect bounds((rs.width() - ps.width()) / 2,
 173                    (rs.height() - ps.height()) / 3,
 174                    ps.width(), ps.height());
 175   views::Widget::InitParams params;
 176   params.type = views::Widget::InitParams::TYPE_POPUP;
 177   params.opacity = views::Widget::InitParams::TRANSLUCENT_WINDOW;
 178   params.ownership = views::Widget::InitParams::WIDGET_OWNS_NATIVE_WIDGET;
 179   params.accept_events = false;
 180   params.can_activate = false;
 181   params.keep_on_top = true;
 182   params.remove_standard_frame = true;
 183   params.delegate = delegate;
 184   params.bounds = bounds;
 185   params.parent = Shell::GetContainer(
 186       root_window,
 187       internal::kShellWindowId_SettingBubbleContainer);
 188   widget_.reset(new views::Widget);
 189   widget_->Init(params);
 190   widget_->SetContentsView(delegate);
 191   widget_->GetNativeView()->SetName("ExitWarningWindow");
 192   widget_->Show();
 193
 194   delegate->NotifyAccessibilityEvent(ui::AccessibilityTypes::EVENT_ALERT, true);
 195 }
 196
 197 void ExitWarningHandler::Hide() {
 198   widget_.reset();
 199 }
 200
 201 }  // namespace ash