gtk: Extract event functions into event_utils module.

chrome/browser/ui/gtk/event_utils.h

+// Copyright (c) 2012 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_BROWSER_UI_GTK_EVENT_UTILS_H_
+#define CHROME_BROWSER_UI_GTK_EVENT_UTILS_H_
+#pragma once
+
+#include <gtk/gtk.h>
+
+#include "webkit/glue/window_open_disposition.h"
+
+namespace event_utils {
+
+// Translates event flags into plaform independent event flags.
+int EventFlagsFromGdkState(guint state);
+
+// Translates GdkEvent state into what kind of disposition they represent.
+// For example, a middle click would mean to open a background tab.
+WindowOpenDisposition DispositionFromGdkState(guint state);
+
+// Get the window open disposition from the state in gtk_get_current_event().
+// This is designed to be called inside a "clicked" event handler. It is an
+// error to call it when gtk_get_current_event() won't return a GdkEventButton*.
+WindowOpenDisposition DispositionForCurrentButtonPressEvent();
+
+}  // namespace event_utils
+
+#endif  // CHROME_BROWSER_UI_GTK_EVENT_UTILS_H_