1 /* 2 * Copyright (C) 2012 Google Inc. All rights reserved. 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions are 6 * met: 7 * 8 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above 11 * copyright notice, this list of conditions and the following disclaimer 12 * in the documentation and/or other materials provided with the 13 * distribution. 14 * * Neither the name of Google Inc. nor the names of its 15 * contributors may be used to endorse or promote products derived from 16 * this software without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 19 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 20 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR 21 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT 22 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 23 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 24 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 25 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 26 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 27 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 28 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 29 */ 30 31 #ifndef FindInPageCoordinates_h 32 #define FindInPageCoordinates_h 33 34 #include "platform/geometry/FloatRect.h" 35 36 namespace WebCore { 37 class Range; 38 class RenderObject; 39 } 40 41 namespace blink { 42 43 // Find-in-page coordinate conversion methods. 44 // 45 // This coordinate system is designed to give consistent tickmarks in cases where find matches 46 // are in scrollable areas but might not be visible (e.g. child frames, scroll:overflow). 47 // In these cases, using absolute positions might lead to tickmarks pointing outside the visible 48 // area of its container, which is counter-intuitive for users. 49 // 50 // Find-in-page coordinates are represented as normalized fractions of the main frame document with 51 // the property that they are built by composing the relative position of each renderer to the maximum 52 // effective layout size of its container all the way up the render tree. The resulting coordinates 53 // are scroll-independent, representing any contents scaled to the visible area of their container. 54 // The provided methods support scroll:overflow and are CSS position and transform-friendly. 55 56 WebCore::FloatRect findInPageRectFromAbsoluteRect(const WebCore::FloatRect&, const WebCore::RenderObject*); 57 WebCore::FloatRect findInPageRectFromRange(WebCore::Range*); 58 59 } // namespace blink 60 61 #endif 62
