src/ash/wm/overview/window_selector_controller.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/wm/overview/window_selector_controller.h"
   6
   7 #include "ash/metrics/user_metrics_recorder.h"
   8 #include "ash/root_window_controller.h"
   9 #include "ash/session_state_delegate.h"
  10 #include "ash/shell.h"
  11 #include "ash/system/tray/system_tray_delegate.h"
  12 #include "ash/wm/mru_window_tracker.h"
  13 #include "ash/wm/overview/window_selector.h"
  14 #include "ash/wm/window_state.h"
  15 #include "ash/wm/window_util.h"
  16 #include "base/metrics/histogram.h"
  17 #include "ui/aura/window.h"
  18
  19 namespace ash {
  20
  21 WindowSelectorController::WindowSelectorController() {
  22 }
  23
  24 WindowSelectorController::~WindowSelectorController() {
  25 }
  26
  27 // static
  28 bool WindowSelectorController::CanSelect() {
  29   // Don't allow a window overview if the screen is locked or a modal dialog is
  30   // open or running in kiosk app session.
  31   return !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
  32          !Shell::GetInstance()->IsSystemModalWindowOpen() &&
  33          Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
  34              user::LOGGED_IN_KIOSK_APP;
  35 }
  36
  37 void WindowSelectorController::ToggleOverview() {
  38   if (IsSelecting()) {
  39     OnSelectionCanceled();
  40   } else {
  41     // Don't start overview if window selection is not allowed.
  42     if (!CanSelect())
  43       return;
  44
  45     std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
  46         mru_window_tracker()->BuildMruWindowList();
  47     // Don't enter overview mode with no windows.
  48     if (windows.empty())
  49       return;
  50
  51     window_selector_.reset(
  52         new WindowSelector(windows, WindowSelector::OVERVIEW, this));
  53     OnSelectionStarted();
  54   }
  55 }
  56
  57 void WindowSelectorController::HandleCycleWindow(
  58     WindowSelector::Direction direction) {
  59   if (!CanSelect())
  60     return;
  61
  62   if (!IsSelecting()) {
  63     std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
  64         mru_window_tracker()->BuildMruWindowList();
  65     // Don't cycle with no windows.
  66     if (windows.empty())
  67       return;
  68
  69     window_selector_.reset(
  70         new WindowSelector(windows, WindowSelector::CYCLE, this));
  71     OnSelectionStarted();
  72   }
  73   window_selector_->Step(direction);
  74 }
  75
  76 bool WindowSelectorController::IsSelecting() {
  77   return window_selector_.get() != NULL;
  78 }
  79
  80 void WindowSelectorController::OnWindowSelected(aura::Window* window) {
  81   wm::ActivateWindow(window);
  82   window_selector_.reset();
  83   last_selection_time_ = base::Time::Now();
  84   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(false);
  85 }
  86
  87 void WindowSelectorController::OnSelectionCanceled() {
  88   window_selector_.reset();
  89   last_selection_time_ = base::Time::Now();
  90   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(false);
  91 }
  92
  93 void WindowSelectorController::OnSelectionStarted() {
  94   Shell::GetInstance()->mru_window_tracker()->SetIgnoreActivations(true);
  95   Shell* shell = Shell::GetInstance();
  96   shell->metrics()->RecordUserMetricsAction(UMA_WINDOW_SELECTION);
  97   if (!last_selection_time_.is_null()) {
  98     UMA_HISTOGRAM_LONG_TIMES(
  99         "Ash.WindowSelector.TimeBetweenUse",
 100         base::Time::Now() - last_selection_time_);
 101   }
 102 }
 103
 104 }  // namespace ash