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 "FindInPageCoordinates.h" 33 34 #include "core/dom/Node.h" 35 #include "core/dom/Range.h" 36 #include "core/page/Frame.h" 37 #include "core/platform/graphics/FloatPoint.h" 38 #include "core/platform/graphics/FloatQuad.h" 39 #include "core/platform/graphics/FloatRect.h" 40 #include "core/platform/graphics/IntPoint.h" 41 #include "core/rendering/RenderBlock.h" 42 #include "core/rendering/RenderBox.h" 43 #include "core/rendering/RenderObject.h" 44 #include "core/rendering/RenderPart.h" 45 #include "core/rendering/RenderView.h" 46 #include "core/rendering/style/RenderStyle.h" 47 48 using namespace WebCore; 49 50 namespace WebKit { 51 52 static const RenderBlock* enclosingScrollableAncestor(const RenderObject* renderer) 53 { 54 ASSERT(!renderer->isRenderView()); 55 56 // Trace up the containingBlocks until we reach either the render view or a scrollable object. 57 const RenderBlock* container = renderer->containingBlock(); 58 while (!container->hasOverflowClip() && !container->isRenderView()) 59 container = container->containingBlock(); 60 return container; 61 } 62 63 static FloatRect toNormalizedRect(const FloatRect& absoluteRect, const RenderObject* renderer, const RenderBlock* container) 64 { 65 ASSERT(renderer); 66 67 ASSERT(container || renderer->isRenderView()); 68 if (!container) 69 return FloatRect(); 70 71 // We want to normalize by the max layout overflow size instead of only the visible bounding box. 72 // Quads and their enclosing bounding boxes need to be used in order to keep results transform-friendly. 73 FloatPoint scrolledOrigin; 74 75 // For overflow:scroll we need to get where the actual origin is independently of the scroll. 76 if (container->hasOverflowClip()) 77 scrolledOrigin = -IntPoint(container->scrolledContentOffset()); 78 79 FloatRect overflowRect(scrolledOrigin, container->maxLayoutOverflow()); 80 FloatRect containerRect = container->localToAbsoluteQuad(FloatQuad(overflowRect)).enclosingBoundingBox(); 81 82 if (containerRect.isEmpty()) 83 return FloatRect(); 84 85 // Make the coordinates relative to the container enclosing bounding box. 86 // Since we work with rects enclosing quad unions this is still transform-friendly. 87 FloatRect normalizedRect = absoluteRect; 88 normalizedRect.moveBy(-containerRect.location()); 89 90 // Fixed positions do not make sense in this coordinate system, but need to leave consistent tickmarks. 91 // So, use their position when the view is not scrolled, like an absolute position. 92 if (renderer->style()->position() == FixedPosition && container->isRenderView()) 93 normalizedRect.move(-toRenderView(container)->frameView()->scrollOffsetForFixedPosition()); 94 95 normalizedRect.scale(1 / containerRect.width(), 1 / containerRect.height()); 96 return normalizedRect; 97 } 98 99 FloatRect findInPageRectFromAbsoluteRect(const FloatRect& inputRect, const RenderObject* baseRenderer) 100 { 101 if (!baseRenderer || inputRect.isEmpty()) 102 return FloatRect(); 103 104 // Normalize the input rect to its container block. 105 const RenderBlock* baseContainer = enclosingScrollableAncestor(baseRenderer); 106 FloatRect normalizedRect = toNormalizedRect(inputRect, baseRenderer, baseContainer); 107 108 // Go up across frames. 109 for (const RenderBox* renderer = baseContainer; renderer; ) { 110 111 // Go up the render tree until we reach the root of the current frame (the RenderView). 112 while (!renderer->isRenderView()) { 113 const RenderBlock* container = enclosingScrollableAncestor(renderer); 114 115 // Compose the normalized rects. 116 FloatRect normalizedBoxRect = toNormalizedRect(renderer->absoluteBoundingBoxRect(), renderer, container); 117 normalizedRect.scale(normalizedBoxRect.width(), normalizedBoxRect.height()); 118 normalizedRect.moveBy(normalizedBoxRect.location()); 119 120 renderer = container; 121 } 122 123 ASSERT(renderer->isRenderView()); 124 125 // Jump to the renderer owning the frame, if any. 126 renderer = renderer->frame() ? renderer->frame()->ownerRenderer() : 0; 127 } 128 129 return normalizedRect; 130 } 131 132 FloatRect findInPageRectFromRange(Range* range) 133 { 134 if (!range || !range->firstNode()) 135 return FloatRect(); 136 137 return findInPageRectFromAbsoluteRect(RenderObject::absoluteBoundingBoxRectForRange(range), range->firstNode()->renderer()); 138 } 139 140 } // namespace WebKit 141