components/webui_generator/view.cc

   1 // Copyright 2015 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 "components/webui_generator/view.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/scoped_ptr.h"
   9 #include "components/webui_generator/view_model.h"
  10
  11 namespace webui_generator {
  12
  13 View::View(const std::string& id)
  14     : parent_(NULL),
  15       id_(id),
  16       ready_children_(0),
  17       view_model_ready_(false),
  18       ready_(false),
  19       weak_factory_(this) {
  20 }
  21
  22 View::~View() {
  23 }
  24
  25 void View::Init() {
  26   CreateAndAddChildren();
  27
  28   if (!IsRootView())
  29     path_ = parent_->path() + "$";
  30
  31   path_ += id_;
  32   view_model_.reset(CreateViewModel());
  33   view_model_->SetView(this);
  34
  35   for (auto& id_child : children_)
  36     id_child.second->Init();
  37
  38   if (children_.empty())
  39     OnChildrenReady();
  40 }
  41
  42 bool View::IsRootView() const {
  43   return !parent_;
  44 }
  45
  46 ViewModel* View::GetViewModel() const {
  47   return view_model_.get();
  48 }
  49
  50 void View::OnViewModelReady() {
  51   view_model_ready_ = true;
  52   if (ready_children_ == static_cast<int>(children_.size()))
  53     OnReady();
  54 }
  55
  56 View* View::GetChild(const std::string& id) const {
  57   auto it = children_.find(id);
  58   if (it == children_.end())
  59     return nullptr;
  60
  61   return it->second;
  62 }
  63
  64 void View::OnReady() {
  65   if (ready_)
  66     return;
  67
  68   ready_ = true;
  69   if (!IsRootView())
  70     parent_->OnChildReady(this);
  71 }
  72
  73 void View::UpdateContext(const base::DictionaryValue& diff) {
  74   DCHECK(ready_);
  75   view_model_->UpdateContext(diff);
  76 }
  77
  78 void View::HandleEvent(const std::string& event) {
  79   DCHECK(ready_);
  80   view_model_->OnEvent(event);
  81 }
  82
  83 void View::AddChild(View* child) {
  84   DCHECK(children_.find(child->id()) == children_.end());
  85   DCHECK(!child->id().empty());
  86   children_.set(child->id(), make_scoped_ptr(child));
  87   child->set_parent(this);
  88 }
  89
  90 void View::OnChildReady(View* child) {
  91   ++ready_children_;
  92   if (ready_children_ == static_cast<int>(children_.size()))
  93     OnChildrenReady();
  94 }
  95
  96 void View::OnChildrenReady() {
  97   view_model_->OnChildrenReady();
  98   if (view_model_ready_)
  99     OnReady();
 100 }
 101
 102 }  // namespace webui_generator