text: // Copyright (c) 2009 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/renderer/user_script_idle_scheduler.h"
  
  #include "base/message_loop.h"
  #include "chrome/renderer/render_view.h"
  
  namespace {
  // The length of time to wait after the DOM is complete to try and run user
  // scripts.
  const int kUserScriptIdleTimeoutMs = 200;
  }
  
  UserScriptIdleScheduler::UserScriptIdleScheduler(RenderView* view,
                                                   WebKit::WebFrame* frame)
      : ALLOW_THIS_IN_INITIALIZER_LIST(method_factory_(this)), view_(view),
    frame_(frame), has_run_(false) {
  }
  
  void UserScriptIdleScheduler::DidFinishDocumentLoad() {
    MessageLoop::current()->PostDelayedTask(FROM_HERE,
        method_factory_.NewRunnableMethod(&UserScriptIdleScheduler::MaybeRun),
        kUserScriptIdleTimeoutMs);
  }
  
  void UserScriptIdleScheduler::DidFinishLoad() {
    // Ensure that running scripts does not keep any progress UI running.
    MessageLoop::current()->PostTask(FROM_HERE,
        method_factory_.NewRunnableMethod(&UserScriptIdleScheduler::MaybeRun));
  }
  
  void UserScriptIdleScheduler::Cancel() {
    view_ = NULL;
    frame_ = NULL;
  }
  
  void UserScriptIdleScheduler::MaybeRun() {
    if (!view_ || has_run())
      return;
  
    // Note: we must set this before calling OnUserScriptIdleTriggered, because
    // that may result in a synchronous call back into MaybeRun if there is a
    // pending task currently in the queue.
    // http://code.google.com/p/chromium/issues/detail?id=29644
    has_run_ = true;
  
    DCHECK(frame_);
    view_->OnUserScriptIdleTriggered(frame_);
    Cancel();
  }
  