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