1// Copyright 2014 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 "chrome/browser/ui/app_list/app_list_shower_views.h"
6
7#include "base/bind.h"
8#include "base/message_loop/message_loop.h"
9#include "chrome/browser/apps/scoped_keep_alive.h"
10#include "chrome/browser/profiles/profile.h"
11#include "chrome/browser/ui/app_list/app_list_shower_delegate.h"
12#include "chrome/browser/ui/app_list/app_list_view_delegate.h"
13#include "ui/app_list/views/app_list_view.h"
14#include "ui/gfx/geometry/point.h"
15#include "ui/gfx/screen.h"
16
17AppListShower::AppListShower(AppListShowerDelegate* delegate)
18    : delegate_(delegate),
19      profile_(NULL),
20      app_list_(NULL),
21      window_icon_updated_(false) {
22}
23
24AppListShower::~AppListShower() {
25}
26
27void AppListShower::ShowForProfile(Profile* requested_profile) {
28  // If the app list is already displaying |profile| just activate it (in case
29  // we have lost focus).
30  if (IsAppListVisible() && (requested_profile == profile_)) {
31    Show();
32    return;
33  }
34
35  if (!HasView()) {
36    CreateViewForProfile(requested_profile);
37  } else if (requested_profile != profile_) {
38    profile_ = requested_profile;
39    UpdateViewForNewProfile();
40  }
41
42  keep_alive_.reset(new ScopedKeepAlive);
43  if (!IsAppListVisible())
44    delegate_->MoveNearCursor(app_list_);
45  Show();
46}
47
48gfx::NativeWindow AppListShower::GetWindow() {
49  if (!IsAppListVisible())
50    return NULL;
51  return app_list_->GetWidget()->GetNativeWindow();
52}
53
54void AppListShower::CreateViewForProfile(Profile* requested_profile) {
55  profile_ = requested_profile;
56  app_list_ = MakeViewForCurrentProfile();
57  delegate_->OnViewCreated();
58}
59
60void AppListShower::DismissAppList() {
61  if (HasView()) {
62    Hide();
63    delegate_->OnViewDismissed();
64    // This can be reached by pressing the dismiss accelerator. To prevent
65    // events from being processed with a destroyed dispatcher, delay the reset
66    // of the keep alive.
67    ResetKeepAliveSoon();
68  }
69}
70
71void AppListShower::HandleViewBeingDestroyed() {
72  app_list_ = NULL;
73  profile_ = NULL;
74
75  // We may end up here as the result of the OS deleting the AppList's
76  // widget (WidgetObserver::OnWidgetDestroyed). If this happens and there
77  // are no browsers around then deleting the keep alive will result in
78  // deleting the Widget again (by way of CloseAllSecondaryWidgets). When
79  // the stack unravels we end up back in the Widget that was deleted and
80  // crash. By delaying deletion of the keep alive we ensure the Widget has
81  // correctly been destroyed before ending the keep alive so that
82  // CloseAllSecondaryWidgets() won't attempt to delete the AppList's Widget
83  // again.
84  ResetKeepAliveSoon();
85}
86
87bool AppListShower::IsAppListVisible() const {
88  return app_list_ && app_list_->GetWidget()->IsVisible();
89}
90
91void AppListShower::WarmupForProfile(Profile* profile) {
92  DCHECK(!profile_);
93  CreateViewForProfile(profile);
94  app_list_->Prerender();
95}
96
97bool AppListShower::HasView() const {
98  return !!app_list_;
99}
100
101app_list::AppListView* AppListShower::MakeViewForCurrentProfile() {
102  // The app list view manages its own lifetime.
103  app_list::AppListView* view =
104      new app_list::AppListView(delegate_->GetViewDelegateForCreate());
105  gfx::Point cursor = gfx::Screen::GetNativeScreen()->GetCursorScreenPoint();
106  view->InitAsBubbleAtFixedLocation(NULL,
107                                    0,
108                                    cursor,
109                                    views::BubbleBorder::FLOAT,
110                                    false /* border_accepts_events */);
111  return view;
112}
113
114void AppListShower::UpdateViewForNewProfile() {
115  app_list_->SetProfileByPath(profile_->GetPath());
116}
117
118void AppListShower::Show() {
119  app_list_->GetWidget()->Show();
120  if (!window_icon_updated_) {
121    app_list_->GetWidget()->GetTopLevelWidget()->UpdateWindowIcon();
122    window_icon_updated_ = true;
123  }
124  app_list_->GetWidget()->Activate();
125}
126
127void AppListShower::Hide() {
128  app_list_->GetWidget()->Hide();
129}
130
131void AppListShower::ResetKeepAliveSoon() {
132  if (base::MessageLoop::current()) {  // NULL in tests.
133    base::MessageLoop::current()->PostTask(
134        FROM_HERE,
135        base::Bind(&AppListShower::ResetKeepAlive, base::Unretained(this)));
136    return;
137  }
138  ResetKeepAlive();
139}
140
141void AppListShower::ResetKeepAlive() {
142  keep_alive_.reset();
143}
144