content/browser/renderer_host/ui_events_helper.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_BROWSER_RENDERER_HOST_UI_EVENTS_HELPER_H_
   6 #define CONTENT_BROWSER_RENDERER_HOST_UI_EVENTS_HELPER_H_
   7
   8 #include "base/memory/scoped_vector.h"
   9 #include "content/common/content_export.h"
  10 #include "content/port/browser/event_with_latency_info.h"
  11
  12 namespace blink {
  13 class WebGestureEvent;
  14 class WebTouchEvent;
  15 class WebTouchPoint;
  16 }
  17
  18 namespace ui {
  19 class GestureEvent;
  20 class TouchEvent;
  21 }
  22
  23 namespace content {
  24
  25 enum TouchEventCoordinateSystem {
  26   SCREEN_COORDINATES,
  27   LOCAL_COORDINATES
  28 };
  29
  30 // Creates a list of ui::TouchEvents out of a single WebTouchEvent.
  31 // A WebTouchEvent can contain information about a number of WebTouchPoints,
  32 // whereas a ui::TouchEvent contains information about a single touch-point. So
  33 // it is possible to create more than one ui::TouchEvents out of a single
  34 // WebTouchEvent. All the ui::TouchEvent in the list will carry the same
  35 // LatencyInfo the WebTouchEvent carries.
  36 CONTENT_EXPORT bool MakeUITouchEventsFromWebTouchEvents(
  37     const TouchEventWithLatencyInfo& touch,
  38     ScopedVector<ui::TouchEvent>* list,
  39     TouchEventCoordinateSystem coordinate_system);
  40
  41 // Creates a WebGestureEvent from a ui::GestureEvent. Note that it does not
  42 // populate the event coordinates (i.e. |x|, |y|, |globalX|, and |globalY|). So
  43 // the caller must populate these fields.
  44 blink::WebGestureEvent MakeWebGestureEventFromUIEvent(
  45     const ui::GestureEvent& event);
  46
  47 int EventFlagsToWebEventModifiers(int flags);
  48
  49 // Updates the WebTouchEvent based on the TouchEvent. It returns the updated
  50 // WebTouchPoint contained in the WebTouchEvent, or NULL if no point was
  51 // updated.
  52 blink::WebTouchPoint* UpdateWebTouchEventFromUIEvent(
  53     const ui::TouchEvent& event,
  54     blink::WebTouchEvent* web_event);
  55 }
  56
  57 #endif  // CONTENT_BROWSER_RENDERER_HOST_UI_EVENTS_HELPER_H_