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// Copyright (c) 2011 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.
#ifndef CHROME_RENDERER_EXTENSIONS_USER_SCRIPT_IDLE_SCHEDULER_H_
#define CHROME_RENDERER_EXTENSIONS_USER_SCRIPT_IDLE_SCHEDULER_H_
#pragma once
#include <queue>
#include <vector>
#include "base/memory/linked_ptr.h"
#include "base/memory/weak_ptr.h"
class ExtensionDispatcher;
class RenderView;
struct ExtensionMsg_ExecuteCode_Params;
namespace WebKit {
class WebFrame;
}
// Implements support for injecting scripts at "document idle". Currently,
// determining idleness is simple: it is whichever of the following happens
// first:
//
// a) When the initial DOM for a page is complete + kUserScriptIdleTimeout,
// b) or when the page has completely loaded including all subresources.
//
// The intent of this mechanism is to prevent user scripts from slowing down
// fast pages (run after load), while still allowing them to run relatively
// timely for pages with lots of slow subresources.
//
// NOTE: this class does not inherit from RenderViewObserver on purpose. The
// reason is that this object is per frame, and a frame can move across
// RenderViews thanks to adoptNode. So we have each RenderView's
// ExtensionHelper proxy these calls to the renderer process'
// ExtensionDispatcher, which contains the mapping from WebFrame to us.
class UserScriptIdleScheduler {
public:
UserScriptIdleScheduler(WebKit::WebFrame* frame,
ExtensionDispatcher* extension_dispatcher);
~UserScriptIdleScheduler();
void ExecuteCode(const ExtensionMsg_ExecuteCode_Params& params);
void DidFinishDocumentLoad();
void DidFinishLoad();
void DidStartProvisionalLoad();
private:
// Run user scripts, except if they've already run for this frame, or the
// frame has been destroyed.
void MaybeRun();
// Backend for the IPC Message ExecuteCode in addition to being used
// internally.
void ExecuteCodeImpl(const ExtensionMsg_ExecuteCode_Params& params);
// Get all child frames of parent_frame, returned by frames_vector.
bool GetAllChildFrames(WebKit::WebFrame* parent_frame,
std::vector<WebKit::WebFrame*>* frames_vector) const;
base::WeakPtrFactory<UserScriptIdleScheduler> weak_factory_;
// The Frame we will run scripts in.
WebKit::WebFrame* frame_;
// Whether we have already run scripts.
bool has_run_;
// This is only used if we're for the main frame.
std::queue<linked_ptr<ExtensionMsg_ExecuteCode_Params> >
pending_code_execution_queue_;
ExtensionDispatcher* extension_dispatcher_;
};
#endif // CHROME_RENDERER_EXTENSIONS_USER_SCRIPT_IDLE_SCHEDULER_H_
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