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 #include "config.h" 32 #include "web/FindInPageCoordinates.h" 33 34 #include "core/dom/Node.h" 35 #include "core/dom/Range.h" 36 #include "core/frame/LocalFrame.h" 37 #include "core/rendering/RenderBlock.h" 38 #include "core/rendering/RenderBox.h" 39 #include "core/rendering/RenderObject.h" 40 #include "core/rendering/RenderPart.h" 41 #include "core/rendering/RenderView.h" 42 #include "core/rendering/style/RenderStyle.h" 43 #include "platform/geometry/FloatPoint.h" 44 #include "platform/geometry/FloatQuad.h" 45 #include "platform/geometry/IntPoint.h" 46 47 using namespace WebCore; 48 49 namespace blink { 50 51 static const RenderBlock* enclosingScrollableAncestor(const RenderObject* renderer) 52 { 53 ASSERT(!renderer->isRenderView()); 54 55 // Trace up the containingBlocks until we reach either the render view or a scrollable object. 56 const RenderBlock* container = renderer->containingBlock(); 57 while (!container->hasOverflowClip() && !container->isRenderView()) 58 container = container->containingBlock(); 59 return container; 60 } 61 62 static FloatRect toNormalizedRect(const FloatRect& absoluteRect, const RenderObject* renderer, const RenderBlock* container) 63 { 64 ASSERT(renderer); 65 66 ASSERT(container || renderer->isRenderView()); 67 if (!container) 68 return FloatRect(); 69 70 // We want to normalize by the max layout overflow size instead of only the visible bounding box. 71 // Quads and their enclosing bounding boxes need to be used in order to keep results transform-friendly. 72 FloatPoint scrolledOrigin; 73 74 // For overflow:scroll we need to get where the actual origin is independently of the scroll. 75 if (container->hasOverflowClip()) 76 scrolledOrigin = -IntPoint(container->scrolledContentOffset()); 77 78 FloatRect overflowRect(scrolledOrigin, container->maxLayoutOverflow()); 79 FloatRect containerRect = container->localToAbsoluteQuad(FloatQuad(overflowRect)).enclosingBoundingBox(); 80 81 if (containerRect.isEmpty()) 82 return FloatRect(); 83 84 // Make the coordinates relative to the container enclosing bounding box. 85 // Since we work with rects enclosing quad unions this is still transform-friendly. 86 FloatRect normalizedRect = absoluteRect; 87 normalizedRect.moveBy(-containerRect.location()); 88 89 // Fixed positions do not make sense in this coordinate system, but need to leave consistent tickmarks. 90 // So, use their position when the view is not scrolled, like an absolute position. 91 if (renderer->style()->position() == FixedPosition && container->isRenderView()) 92 normalizedRect.move(-toRenderView(container)->frameView()->scrollOffsetForFixedPosition()); 93 94 normalizedRect.scale(1 / containerRect.width(), 1 / containerRect.height()); 95 return normalizedRect; 96 } 97 98 FloatRect findInPageRectFromAbsoluteRect(const FloatRect& inputRect, const RenderObject* baseRenderer) 99 { 100 if (!baseRenderer || inputRect.isEmpty()) 101 return FloatRect(); 102 103 // Normalize the input rect to its container block. 104 const RenderBlock* baseContainer = enclosingScrollableAncestor(baseRenderer); 105 FloatRect normalizedRect = toNormalizedRect(inputRect, baseRenderer, baseContainer); 106 107 // Go up across frames. 108 for (const RenderBox* renderer = baseContainer; renderer; ) { 109 110 // Go up the render tree until we reach the root of the current frame (the RenderView). 111 while (!renderer->isRenderView()) { 112 const RenderBlock* container = enclosingScrollableAncestor(renderer); 113 114 // Compose the normalized rects. 115 FloatRect normalizedBoxRect = toNormalizedRect(renderer->absoluteBoundingBoxRect(), renderer, container); 116 normalizedRect.scale(normalizedBoxRect.width(), normalizedBoxRect.height()); 117 normalizedRect.moveBy(normalizedBoxRect.location()); 118 119 renderer = container; 120 } 121 122 ASSERT(renderer->isRenderView()); 123 124 // Jump to the renderer owning the frame, if any. 125 renderer = renderer->frame() ? renderer->frame()->ownerRenderer() : 0; 126 } 127 128 return normalizedRect; 129 } 130 131 FloatRect findInPageRectFromRange(Range* range) 132 { 133 if (!range || !range->firstNode()) 134 return FloatRect(); 135 136 return findInPageRectFromAbsoluteRect(RenderObject::absoluteBoundingBoxRectForRange(range), range->firstNode()->renderer()); 137 } 138 139 } // namespace blink 140