| /* |
| * Copyright (C) 2012 Google 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: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * 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. |
| * * Neither the name of Google Inc. nor the names of its |
| * contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT |
| * OWNER OR 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. |
| */ |
| |
| #include "web/FindInPageCoordinates.h" |
| |
| #include "core/dom/Node.h" |
| #include "core/dom/Range.h" |
| #include "core/frame/FrameView.h" |
| #include "core/frame/LocalFrame.h" |
| #include "core/layout/LayoutBlock.h" |
| #include "core/layout/LayoutBox.h" |
| #include "core/layout/LayoutObject.h" |
| #include "core/layout/LayoutPart.h" |
| #include "core/layout/LayoutView.h" |
| #include "core/style/ComputedStyle.h" |
| #include "platform/geometry/FloatPoint.h" |
| #include "platform/geometry/FloatQuad.h" |
| #include "platform/geometry/IntPoint.h" |
| |
| namespace blink { |
| |
| static const LayoutBlock* enclosingScrollableAncestor(const LayoutObject* layoutObject) |
| { |
| DCHECK(!layoutObject->isLayoutView()); |
| |
| // Trace up the containingBlocks until we reach either the layoutObject view or a scrollable object. |
| const LayoutBlock* container = layoutObject->containingBlock(); |
| while (!container->hasOverflowClip() && !container->isLayoutView()) |
| container = container->containingBlock(); |
| return container; |
| } |
| |
| static FloatRect toNormalizedRect(const FloatRect& absoluteRect, const LayoutObject* layoutObject, const LayoutBlock* container) |
| { |
| DCHECK(layoutObject); |
| |
| DCHECK(container || layoutObject->isLayoutView()); |
| if (!container) |
| return FloatRect(); |
| |
| // We want to normalize by the max layout overflow size instead of only the visible bounding box. |
| // Quads and their enclosing bounding boxes need to be used in order to keep results transform-friendly. |
| FloatPoint scrolledOrigin; |
| |
| // For overflow:scroll we need to get where the actual origin is independently of the scroll. |
| if (container->hasOverflowClip()) |
| scrolledOrigin = -IntPoint(container->scrolledContentOffset()); |
| |
| FloatRect overflowRect(scrolledOrigin, FloatSize(container->maxLayoutOverflow())); |
| FloatRect containerRect = container->localToAbsoluteQuad(FloatQuad(overflowRect)).enclosingBoundingBox(); |
| |
| if (containerRect.isEmpty()) |
| return FloatRect(); |
| |
| // Make the coordinates relative to the container enclosing bounding box. |
| // Since we work with rects enclosing quad unions this is still transform-friendly. |
| FloatRect normalizedRect = absoluteRect; |
| normalizedRect.moveBy(-containerRect.location()); |
| |
| // Fixed positions do not make sense in this coordinate system, but need to leave consistent tickmarks. |
| // So, use their position when the view is not scrolled, like an absolute position. |
| if (layoutObject->style()->position() == FixedPosition && container->isLayoutView()) |
| normalizedRect.moveBy(-toLayoutView(container)->frameView()->scrollPosition()); |
| |
| normalizedRect.scale(1 / containerRect.width(), 1 / containerRect.height()); |
| return normalizedRect; |
| } |
| |
| FloatRect findInPageRectFromAbsoluteRect(const FloatRect& inputRect, const LayoutObject* baseLayoutObject) |
| { |
| if (!baseLayoutObject || inputRect.isEmpty()) |
| return FloatRect(); |
| |
| // Normalize the input rect to its container block. |
| const LayoutBlock* baseContainer = enclosingScrollableAncestor(baseLayoutObject); |
| FloatRect normalizedRect = toNormalizedRect(inputRect, baseLayoutObject, baseContainer); |
| |
| // Go up across frames. |
| for (const LayoutBox* layoutObject = baseContainer; layoutObject; ) { |
| |
| // Go up the layout tree until we reach the root of the current frame (the LayoutView). |
| while (!layoutObject->isLayoutView()) { |
| const LayoutBlock* container = enclosingScrollableAncestor(layoutObject); |
| |
| // Compose the normalized rects. |
| FloatRect normalizedBoxRect = toNormalizedRect(layoutObject->absoluteBoundingBoxRect(), layoutObject, container); |
| normalizedRect.scale(normalizedBoxRect.width(), normalizedBoxRect.height()); |
| normalizedRect.moveBy(normalizedBoxRect.location()); |
| |
| layoutObject = container; |
| } |
| |
| DCHECK(layoutObject->isLayoutView()); |
| |
| // Jump to the layoutObject owning the frame, if any. |
| layoutObject = layoutObject->frame() ? layoutObject->frame()->ownerLayoutObject() : 0; |
| } |
| |
| return normalizedRect; |
| } |
| |
| FloatRect findInPageRectFromRange(Range* range) |
| { |
| if (!range || !range->firstNode()) |
| return FloatRect(); |
| |
| return findInPageRectFromAbsoluteRect(LayoutObject::absoluteBoundingBoxRectForRange(range), range->firstNode()->layoutObject()); |
| } |
| |
| } // namespace blink |