Purge the App Launcher code from Windows.

chrome/browser/ui/views/app_list/win/activation_tracker_win.cc

-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "chrome/browser/ui/views/app_list/win/activation_tracker_win.h"
-
-#include "base/time/time.h"
-#include "chrome/browser/ui/app_list/app_list_shower_views.h"
-#include "chrome/browser/ui/views/app_list/win/app_list_service_win.h"
-#include "ui/app_list/app_list_switches.h"
-#include "ui/app_list/views/app_list_view.h"
-#include "ui/views/widget/widget.h"
-
-namespace {
-
-const wchar_t kJumpListClassName[] = L"DV2ControlHost";
-const wchar_t kTrayClassName[] = L"Shell_TrayWnd";
-const int kFocusCheckIntervalMS = 250;
-
-}  // namespace
-
-ActivationTrackerWin::ActivationTrackerWin(AppListServiceWin* service)
-    : service_(service),
-      taskbar_has_focus_(false) {
-  service_->shower().app_list()->AddObserver(this);
-}
-
-ActivationTrackerWin::~ActivationTrackerWin() {
-  DCHECK(service_->shower().app_list());
-  service_->shower().app_list()->RemoveObserver(this);
-  timer_.Stop();
-}
-
-void ActivationTrackerWin::OnActivationChanged(views::Widget* /*widget*/,
-                                               bool active) {
-  if (active) {
-    timer_.Stop();
-    return;
-  }
-
-  taskbar_has_focus_ = false;
-  timer_.Start(FROM_HERE,
-               base::TimeDelta::FromMilliseconds(kFocusCheckIntervalMS), this,
-               &ActivationTrackerWin::MaybeDismissAppList);
-}
-
-void ActivationTrackerWin::OnViewHidden() {
-  timer_.Stop();
-}
-
-void ActivationTrackerWin::MaybeDismissAppList() {
-  if (!ShouldDismissAppList())
-    return;
-
-  service_->DismissAppList();
-}
-
-bool ActivationTrackerWin::ShouldDismissAppList() {
-  // The app launcher should be hidden when it loses focus, except for the cases
-  // necessary to allow the launcher to be pinned or closed via the taskbar
-  // context menu. This will return true to dismiss the app launcher unless one
-  // of the following conditions are met:
-  // - the switch preventing app list dismissal on blur is active, or
-  // - the app launcher is focused, or
-  // - the taskbar's jump list is focused, or
-  // - the taskbar is focused with the right mouse button pressed.
-
-  if (app_list::switches::ShouldNotDismissOnBlur())
-    return false;
-
-  // Remember if the taskbar had focus without the right mouse button being
-  // down.
-  bool taskbar_had_focus = taskbar_has_focus_;
-  taskbar_has_focus_ = false;
-
-  // First get the taskbar and jump lists windows (the jump list is the
-  // context menu which the taskbar uses).
-  HWND jump_list_hwnd = FindWindow(kJumpListClassName, NULL);
-  HWND taskbar_hwnd = FindWindow(kTrayClassName, NULL);
-
-  // First work out if the left or right button is currently down.
-  int swapped = GetSystemMetrics(SM_SWAPBUTTON);
-  int left_button = swapped ? VK_RBUTTON : VK_LBUTTON;
-  bool left_button_down = GetAsyncKeyState(left_button) < 0;
-  int right_button = swapped ? VK_LBUTTON : VK_RBUTTON;
-  bool right_button_down = GetAsyncKeyState(right_button) < 0;
-
-  // Now get the window that currently has focus.
-  HWND focused_hwnd = GetForegroundWindow();
-  if (!focused_hwnd) {
-    // Sometimes the focused window is NULL. This can happen when the focus is
-    // changing due to a mouse button press. Dismiss the launcher if and only if
-    // no button is being pressed.
-    return !right_button_down && !left_button_down;
-  }
-
-  while (focused_hwnd) {
-    // If the focused window is the right click menu (called a jump list) or
-    // the app list, don't hide the launcher.
-    HWND app_list_hwnd = service_->shower().app_list()->GetHWND();
-    if (focused_hwnd == jump_list_hwnd || focused_hwnd == app_list_hwnd)
-      return false;
-
-    if (focused_hwnd == taskbar_hwnd) {
-      // If the focused window is the taskbar, and the right button is down,
-      // don't hide the launcher as the user might be bringing up the menu.
-      if (right_button_down)
-        return false;
-
-      // There is a short period between the right mouse button being down
-      // and the menu gaining focus, where the taskbar has focus and no button
-      // is down. If the taskbar is observed in this state one time, the
-      // launcher is not dismissed. If it happens for two consecutive timer
-      // ticks, it is dismissed.
-      if (!taskbar_had_focus) {
-        taskbar_has_focus_ = true;
-        return false;
-      }
-      return true;
-    }
-    focused_hwnd = GetParent(focused_hwnd);
-  }
-
-  // If we get here, the focused window is not the taskbar, its context menu, or
-  // the app list.
-  return true;
-}