layout/base/PositionedEventTargeting.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef mozilla_PositionedEventTargeting_h
   8 #define mozilla_PositionedEventTargeting_h
   9
  10 #include <stdint.h>
  11 #include "mozilla/EventForwards.h"
  12 #include "RelativeTo.h"
  13
  14 class nsIFrame;
  15 struct nsPoint;
  16
  17 namespace mozilla {
  18
  19 enum { INPUT_IGNORE_ROOT_SCROLL_FRAME = 0x01 };
  20 /**
  21  * Finds the target frame for a pointer event given the event type and location.
  22  * This can look for frames within a rectangle surrounding the actual location
  23  * that are suitable targets, to account for inaccurate pointing devices.
  24  */
  25 nsIFrame* FindFrameTargetedByInputEvent(
  26     WidgetGUIEvent* aEvent, RelativeTo aRootFrame,
  27     const nsPoint& aPointRelativeToRootFrame, uint32_t aFlags = 0);
  28
  29 class MOZ_RAII EventRetargetSuppression {
  30  public:
  31   EventRetargetSuppression();
  32   ~EventRetargetSuppression();
  33   static bool IsActive();
  34
  35  private:
  36   static uint32_t sSuppressionCount;
  37 };
  38
  39 }  // namespace mozilla
  40
  41 #endif /* mozilla_PositionedEventTargeting_h */