ios/web/web_state/web_state_observer.cc

   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 "ios/web/public/web_state/web_state_observer.h"
   6
   7 #include "ios/web/public/load_committed_details.h"
   8 #include "ios/web/public/web_state/web_state.h"
   9
  10 namespace web {
  11
  12 int WebStateObserver::kInvalidFormKeyCode = -1;
  13
  14 WebStateObserver::WebStateObserver(WebState* web_state) : web_state_(nullptr) {
  15   Observe(web_state);
  16 }
  17
  18 WebStateObserver::WebStateObserver() : web_state_(nullptr) {
  19 }
  20
  21 WebStateObserver::~WebStateObserver() {
  22   if (web_state_)
  23     web_state_->RemoveObserver(this);
  24 }
  25
  26 void WebStateObserver::Observe(WebState* web_state) {
  27   if (web_state == web_state_) {
  28     // Early exit to avoid infinite loops if we're in the middle of a callback.
  29     return;
  30   }
  31   if (web_state_)
  32     web_state_->RemoveObserver(this);
  33   web_state_ = web_state;
  34   if (web_state_)
  35     web_state_->AddObserver(this);
  36 }
  37
  38 void WebStateObserver::ResetWebState() {
  39   web_state_->RemoveObserver(this);
  40   web_state_ = nullptr;
  41 }
  42
  43 }  // namespace web