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// Copyright (c) 2010 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_PAGE_CLICK_TRACKER_H_
#define CHROME_RENDERER_PAGE_CLICK_TRACKER_H_
#include <vector>
#include "base/basictypes.h"
#include "base/observer_list.h"
#include "third_party/WebKit/WebKit/chromium/public/WebDOMEventListener.h"
#include "third_party/WebKit/WebKit/chromium/public/WebNode.h"
class PageClickListener;
class RenderView;
namespace WebKit {
class WebFrame;
class WebDOMEvent;
class WebMouseEvent;
}
// 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 WebKit::WebDOMEventListener {
public:
explicit PageClickTracker(RenderView* render_view);
virtual ~PageClickTracker();
// Starts reporting node clicks for |frame| on the listener previously
// specified with SetListener().
void StartTrackingFrame(WebKit::WebFrame* frame);
// Stops reporting node clicks for |frame|. |frame_detached| should be true
// if the frame has already been detached.
void StopTrackingFrame(WebKit::WebFrame* frame, bool frame_detached);
// Called after the mouse event |event| has been processed by WebKit.
void DidHandleMouseEvent(const WebKit::WebMouseEvent& event);
// 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);
private:
// WebKit::WebDOMEventListener implementation.
virtual void handleEvent(const WebKit::WebDOMEvent& event);
// Returns the currently focused node in the associated render view.
// That node may be null.
WebKit::WebNode GetFocusedNode();
// The last node that was clicked and had focus.
WebKit::WebNode last_node_clicked_;
// The render view we are associated with.
RenderView* render_view_;
// 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_;
DISALLOW_COPY_AND_ASSIGN(PageClickTracker);
};
#endif // CHROME_RENDERER_PAGE_CLICK_TRACKER_H_
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