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.
5 #include "chrome/browser/ui/views/app_list/win/activation_tracker_win.h"
7 #include "base/time/time.h"
8 #include "chrome/browser/ui/app_list/app_list_shower_views.h"
9 #include "chrome/browser/ui/views/app_list/win/app_list_service_win.h"
10 #include "ui/app_list/app_list_switches.h"
11 #include "ui/app_list/views/app_list_view.h"
12 #include "ui/views/widget/widget.h"
16 const wchar_t kJumpListClassName[] = L"DV2ControlHost";
17 const wchar_t kTrayClassName[] = L"Shell_TrayWnd";
18 const int kFocusCheckIntervalMS = 250;
22 ActivationTrackerWin::ActivationTrackerWin(AppListServiceWin* service)
24 taskbar_has_focus_(false) {
25 service_->shower().app_list()->AddObserver(this);
28 ActivationTrackerWin::~ActivationTrackerWin() {
29 DCHECK(service_->shower().app_list());
30 service_->shower().app_list()->RemoveObserver(this);
34 void ActivationTrackerWin::OnActivationChanged(views::Widget* /*widget*/,
41 taskbar_has_focus_ = false;
42 timer_.Start(FROM_HERE,
43 base::TimeDelta::FromMilliseconds(kFocusCheckIntervalMS), this,
44 &ActivationTrackerWin::MaybeDismissAppList);
47 void ActivationTrackerWin::OnViewHidden() {
51 void ActivationTrackerWin::MaybeDismissAppList() {
52 if (!ShouldDismissAppList())
55 service_->DismissAppList();
58 bool ActivationTrackerWin::ShouldDismissAppList() {
59 // The app launcher should be hidden when it loses focus, except for the cases
60 // necessary to allow the launcher to be pinned or closed via the taskbar
61 // context menu. This will return true to dismiss the app launcher unless one
62 // of the following conditions are met:
63 // - the switch preventing app list dismissal on blur is active, or
64 // - the app launcher is focused, or
65 // - the taskbar's jump list is focused, or
66 // - the taskbar is focused with the right mouse button pressed.
68 if (app_list::switches::ShouldNotDismissOnBlur())
71 // Remember if the taskbar had focus without the right mouse button being
73 bool taskbar_had_focus = taskbar_has_focus_;
74 taskbar_has_focus_ = false;
76 // First get the taskbar and jump lists windows (the jump list is the
77 // context menu which the taskbar uses).
78 HWND jump_list_hwnd = FindWindow(kJumpListClassName, NULL);
79 HWND taskbar_hwnd = FindWindow(kTrayClassName, NULL);
81 // First work out if the left or right button is currently down.
82 int swapped = GetSystemMetrics(SM_SWAPBUTTON);
83 int left_button = swapped ? VK_RBUTTON : VK_LBUTTON;
84 bool left_button_down = GetAsyncKeyState(left_button) < 0;
85 int right_button = swapped ? VK_LBUTTON : VK_RBUTTON;
86 bool right_button_down = GetAsyncKeyState(right_button) < 0;
88 // Now get the window that currently has focus.
89 HWND focused_hwnd = GetForegroundWindow();
91 // Sometimes the focused window is NULL. This can happen when the focus is
92 // changing due to a mouse button press. Dismiss the launcher if and only if
93 // no button is being pressed.
94 return !right_button_down && !left_button_down;
97 while (focused_hwnd) {
98 // If the focused window is the right click menu (called a jump list) or
99 // the app list, don't hide the launcher.
100 HWND app_list_hwnd = service_->shower().app_list()->GetHWND();
101 if (focused_hwnd == jump_list_hwnd || focused_hwnd == app_list_hwnd)
104 if (focused_hwnd == taskbar_hwnd) {
105 // If the focused window is the taskbar, and the right button is down,
106 // don't hide the launcher as the user might be bringing up the menu.
107 if (right_button_down)
110 // There is a short period between the right mouse button being down
111 // and the menu gaining focus, where the taskbar has focus and no button
112 // is down. If the taskbar is observed in this state one time, the
113 // launcher is not dismissed. If it happens for two consecutive timer
114 // ticks, it is dismissed.
115 if (!taskbar_had_focus) {
116 taskbar_has_focus_ = true;
121 focused_hwnd = GetParent(focused_hwnd);
124 // If we get here, the focused window is not the taskbar, its context menu, or