/* * Copyright (C) 2011 Apple Inc. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF * THE POSSIBILITY OF SUCH DAMAGE. */ #import <Foundation/Foundation.h> @class CALayer; @class WebView; typedef NS_ENUM(NSInteger, WebFixedPositionAnchorEdge) { WebFixedPositionAnchorEdgeLeft, WebFixedPositionAnchorEdgeRight, WebFixedPositionAnchorEdgeTop, WebFixedPositionAnchorEdgeBottom }; // Encapsulates page content that needs to be repositioned during scrolling, // like position:fixed layers. // Can be called without taking the WebThread lock. @interface WebFixedPositionContent : NSObject { struct WebFixedPositionContentData* _private; } - (id)initWithWebView:(WebView *)webView; - (void)scrollOrZoomChanged:(CGRect)positionedObjectsRect; - (void)overflowScrollPositionForLayer:(CALayer *)scrollLayer changedTo:(CGPoint)scrollPosition; - (void)didFinishScrollingOrZooming; - (BOOL)hasFixedOrStickyPositionLayers; // Returns CGFLOAT_MAX if there are no layers anchored to the given edge. - (CGFloat)minimumOffsetFromFixedPositionLayersToAnchorEdge:(WebFixedPositionAnchorEdge)anchorEdge ofRect:(CGRect)rect inLayer:(CALayer *)layer; @end