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