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/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()->
  32              IsActiveUserSessionStarted() &&
  33          !Shell::GetInstance()->session_state_delegate()->IsScreenLocked() &&
  34          !Shell::GetInstance()->IsSystemModalWindowOpen() &&
  35          Shell::GetInstance()->system_tray_delegate()->GetUserLoginStatus() !=
  36              user::LOGGED_IN_KIOSK_APP;
  37 }
  38
  39 void WindowSelectorController::ToggleOverview() {
  40   if (IsSelecting()) {
  41     OnSelectionEnded();
  42   } else {
  43     // Don't start overview if window selection is not allowed.
  44     if (!CanSelect())
  45       return;
  46
  47     std::vector<aura::Window*> windows = ash::Shell::GetInstance()->
  48         mru_window_tracker()->BuildMruWindowList();
  49     // Don't enter overview mode with no windows.
  50     if (windows.empty())
  51       return;
  52
  53     window_selector_.reset(new WindowSelector(windows, this));
  54     OnSelectionStarted();
  55   }
  56 }
  57
  58 bool WindowSelectorController::IsSelecting() {
  59   return window_selector_.get() != NULL;
  60 }
  61
  62 // TODO(flackr): Make WindowSelectorController observe the activation of
  63 // windows, so we can remove WindowSelectorDelegate.
  64 void WindowSelectorController::OnSelectionEnded() {
  65   window_selector_.reset();
  66   last_selection_time_ = base::Time::Now();
  67 }
  68
  69 void WindowSelectorController::OnSelectionStarted() {
  70   if (!last_selection_time_.is_null()) {
  71     UMA_HISTOGRAM_LONG_TIMES(
  72         "Ash.WindowSelector.TimeBetweenUse",
  73         base::Time::Now() - last_selection_time_);
  74   }
  75 }
  76
  77 }  // namespace ash