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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.
#include <vector>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "content/public/renderer/render_view_observer.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebDOMEventListener.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebNode.h"
class PageClickListener;
// This class is responsible for tracking clicks on elements in web pages and
// notifiying the associated listener when a node is clicked.
// Compared to a simple WebDOMEventListener, it offers the added capability of
// notifying the listeners of whether the clicked node was already focused
// before it was clicked.
// This is useful for password/form autofill where we want to trigger a
// suggestion popup when a text input is clicked.
// It only notifies of WebInputElement that are text inputs being clicked, but
// could easily be changed to report click on any type of WebNode.
// There is one PageClickTracker per RenderView.
class PageClickTracker : public content::RenderViewObserver,
public WebKit::WebDOMEventListener {
explicit PageClickTracker(content::RenderView* render_view);
virtual ~PageClickTracker();
// Adds/removes a listener for getting notification when an element is
// clicked. Note that the order of insertion is important as a listener when
// notified can decide to stop the propagation of the event (so that listeners
// inserted after don't get the notification).
void AddListener(PageClickListener* listener);
void RemoveListener(PageClickListener* listener);
// RenderView::Observer implementation.
virtual void DidFinishDocumentLoad(WebKit::WebFrame* frame) OVERRIDE;
virtual void FrameDetached(WebKit::WebFrame* frame) OVERRIDE;
virtual void DidHandleMouseEvent(const WebKit::WebMouseEvent& event) OVERRIDE;
// WebKit::WebDOMEventListener implementation.
virtual void handleEvent(const WebKit::WebDOMEvent& event);
// Checks to see if a text field is losing focus and inform listeners if
// it is.
void HandleTextFieldMaybeLosingFocus(
const WebKit::WebNode& newly_clicked_node);
// The last node that was clicked and had focus.
WebKit::WebNode last_node_clicked_;
// Whether the last clicked node had focused before it was clicked.
bool was_focused_;
// The frames we are listening to for mouse events.
typedef std::vector<WebKit::WebFrame*> FrameList;
FrameList tracked_frames_;
// The listener getting the actual notifications.
ObserverList<PageClickListener> listeners_;