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 <vector>
   8
   9 #include "ash/metrics/user_metrics_recorder.h"
  10 #include "ash/root_window_controller.h"
  11 #include "ash/session/session_state_delegate.h"
  12 #include "ash/shell.h"
  13 #include "ash/system/tray/system_tray_delegate.h"
  14 #include "ash/wm/mru_window_tracker.h"
  15 #include "ash/wm/overview/window_selector.h"
  16 #include "ash/wm/window_state.h"
  17 #include "ash/wm/window_util.h"
  18 #include "base/metrics/histogram.h"
  19 #include "ui/aura/window.h"
  20
  21 namespace ash {
  22
  23 WindowSelectorController::WindowSelectorController() {
  24 }
  25
  26 WindowSelectorController::~WindowSelectorController() {
  27 }
  28
  29 // static
  30 bool WindowSelectorController::CanSelect() {
  31   // Don't allow a window overview if the screen is locked or a modal dialog is
  32   // open or running in kiosk app session.
  33   return Shell::GetInstance()->session_state_delegate()->
  34              IsActiveUserSessionStarted() &&
  35          !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
  36          !Shell::GetInstance()->IsSystemModalWindowOpen() &&
  37          Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
  38              user::LOGGED_IN_KIOSK_APP;
  39 }
  40
  41 void WindowSelectorController::ToggleOverview() {
  42   if (IsSelecting()) {
  43     OnSelectionEnded();
  44   } else {
  45     // Don't start overview if window selection is not allowed.
  46     if (!CanSelect())
  47       return;
  48
  49     std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
  50         mru_window_tracker()->BuildMruWindowList();
  51     // Don't enter overview mode with no windows.
  52     if (windows.empty())
  53       return;
  54
  55     window_selector_.reset(new WindowSelector(windows, this));
  56     OnSelectionStarted();
  57   }
  58 }
  59
  60 bool WindowSelectorController::IsSelecting() {
  61   return window_selector_.get() != NULL;
  62 }
  63
  64 // TODO(flackr): Make WindowSelectorController observe the activation of
  65 // windows, so we can remove WindowSelectorDelegate.
  66 void WindowSelectorController::OnSelectionEnded() {
  67   window_selector_.reset();
  68   last_selection_time_ = base::Time::Now();
  69 }
  70
  71 void WindowSelectorController::OnSelectionStarted() {
  72   if (!last_selection_time_.is_null()) {
  73     UMA_HISTOGRAM_LONG_TIMES(
  74         "Ash.WindowSelector.TimeBetweenUse",
  75         base::Time::Now() - last_selection_time_);
  76   }
  77 }
  78
  79 }  // namespace ash