TouchActionHelper.h (1471B)
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_layers_TouchActionHelper_h__ 8 #define __mozilla_layers_TouchActionHelper_h__ 9 10 #include "mozilla/layers/LayersTypes.h" // for TouchBehaviorFlags 11 #include "RelativeTo.h" // for RelativeTo 12 13 class nsIWidget; 14 namespace mozilla { 15 16 namespace dom { 17 class Document; 18 } // namespace dom 19 20 class WidgetTouchEvent; 21 } // namespace mozilla 22 23 namespace mozilla::layers { 24 25 /* 26 * Helper class to figure out the allowed touch behavior for frames, as per 27 * the touch-action spec. 28 */ 29 class TouchActionHelper { 30 public: 31 /* 32 * Performs hit testing on content, finds frame that corresponds to the touch 33 * points of aEvent and retrieves touch-action CSS property value from it 34 * according the rules specified in the spec: 35 * http://www.w3.org/TR/pointerevents/#the-touch-action-css-property. 36 */ 37 static nsTArray<TouchBehaviorFlags> GetAllowedTouchBehavior( 38 nsIWidget* aWidget, dom::Document* aDocument, 39 const WidgetTouchEvent& aPoint); 40 41 static TouchBehaviorFlags GetAllowedTouchBehaviorForFrame(nsIFrame* aFrame); 42 }; 43 44 } // namespace mozilla::layers 45 46 #endif /*__mozilla_layers_TouchActionHelper_h__ */