| /* |
| * Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies) |
| * Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org> |
| * |
| * 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 COMPUTER, INC. ``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 COMPUTER, INC. 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 "config.h" |
| #include "SpatialNavigation.h" |
| |
| #include "Frame.h" |
| #include "FrameTree.h" |
| #include "FrameView.h" |
| #include "HTMLAreaElement.h" |
| #include "HTMLImageElement.h" |
| #include "HTMLMapElement.h" |
| #include "HTMLNames.h" |
| #include "IntRect.h" |
| #include "Node.h" |
| #include "Page.h" |
| #include "RenderInline.h" |
| #include "RenderLayer.h" |
| #include "Settings.h" |
| |
| namespace WebCore { |
| |
| static RectsAlignment alignmentForRects(FocusDirection, const LayoutRect&, const LayoutRect&, const LayoutSize& viewSize); |
| static bool areRectsFullyAligned(FocusDirection, const LayoutRect&, const LayoutRect&); |
| static bool areRectsPartiallyAligned(FocusDirection, const LayoutRect&, const LayoutRect&); |
| static bool areRectsMoreThanFullScreenApart(FocusDirection, const LayoutRect& curRect, const LayoutRect& targetRect, const LayoutSize& viewSize); |
| static bool isRectInDirection(FocusDirection, const LayoutRect&, const LayoutRect&); |
| static void deflateIfOverlapped(LayoutRect&, LayoutRect&); |
| static LayoutRect rectToAbsoluteCoordinates(Frame* initialFrame, const LayoutRect&); |
| static void entryAndExitPointsForDirection(FocusDirection, const LayoutRect& startingRect, const LayoutRect& potentialRect, LayoutPoint& exitPoint, LayoutPoint& entryPoint); |
| static bool isScrollableNode(const Node*); |
| |
| FocusCandidate::FocusCandidate(Node* node, FocusDirection direction) |
| : visibleNode(0) |
| , focusableNode(0) |
| , enclosingScrollableBox(0) |
| , distance(maxDistance()) |
| , parentDistance(maxDistance()) |
| , alignment(None) |
| , parentAlignment(None) |
| , isOffscreen(true) |
| , isOffscreenAfterScrolling(true) |
| { |
| ASSERT(node); |
| ASSERT(node->isElementNode()); |
| |
| if (node->hasTagName(HTMLNames::areaTag)) { |
| HTMLAreaElement* area = static_cast<HTMLAreaElement*>(node); |
| HTMLImageElement* image = area->imageElement(); |
| if (!image || !image->renderer()) |
| return; |
| |
| visibleNode = image; |
| rect = virtualRectForAreaElementAndDirection(area, direction); |
| } else { |
| if (!node->renderer()) |
| return; |
| |
| visibleNode = node; |
| rect = nodeRectInAbsoluteCoordinates(node, true /* ignore border */); |
| } |
| |
| focusableNode = node; |
| isOffscreen = hasOffscreenRect(visibleNode); |
| isOffscreenAfterScrolling = hasOffscreenRect(visibleNode, direction); |
| } |
| |
| bool isSpatialNavigationEnabled(const Frame* frame) |
| { |
| return (frame && frame->settings() && frame->settings()->spatialNavigationEnabled()); |
| } |
| |
| static RectsAlignment alignmentForRects(FocusDirection direction, const LayoutRect& curRect, const LayoutRect& targetRect, const LayoutSize& viewSize) |
| { |
| // If we found a node in full alignment, but it is too far away, ignore it. |
| if (areRectsMoreThanFullScreenApart(direction, curRect, targetRect, viewSize)) |
| return None; |
| |
| if (areRectsFullyAligned(direction, curRect, targetRect)) |
| return Full; |
| |
| if (areRectsPartiallyAligned(direction, curRect, targetRect)) |
| return Partial; |
| |
| return None; |
| } |
| |
| static inline bool isHorizontalMove(FocusDirection direction) |
| { |
| return direction == FocusDirectionLeft || direction == FocusDirectionRight; |
| } |
| |
| static inline LayoutUnit start(FocusDirection direction, const LayoutRect& rect) |
| { |
| return isHorizontalMove(direction) ? rect.y() : rect.x(); |
| } |
| |
| static inline LayoutUnit middle(FocusDirection direction, const LayoutRect& rect) |
| { |
| LayoutPoint center(rect.center()); |
| return isHorizontalMove(direction) ? center.y(): center.x(); |
| } |
| |
| static inline LayoutUnit end(FocusDirection direction, const LayoutRect& rect) |
| { |
| return isHorizontalMove(direction) ? rect.maxY() : rect.maxX(); |
| } |
| |
| // This method checks if rects |a| and |b| are fully aligned either vertically or |
| // horizontally. In general, rects whose central point falls between the top or |
| // bottom of each other are considered fully aligned. |
| // Rects that match this criteria are preferable target nodes in move focus changing |
| // operations. |
| // * a = Current focused node's rect. |
| // * b = Focus candidate node's rect. |
| static bool areRectsFullyAligned(FocusDirection direction, const LayoutRect& a, const LayoutRect& b) |
| { |
| LayoutUnit aStart, bStart, aEnd, bEnd; |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| aStart = a.x(); |
| bEnd = b.maxX(); |
| break; |
| case FocusDirectionRight: |
| aStart = b.x(); |
| bEnd = a.maxX(); |
| break; |
| case FocusDirectionUp: |
| aStart = a.y(); |
| bEnd = b.y(); |
| break; |
| case FocusDirectionDown: |
| aStart = b.y(); |
| bEnd = a.y(); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| if (aStart < bEnd) |
| return false; |
| |
| aStart = start(direction, a); |
| bStart = start(direction, b); |
| |
| LayoutUnit aMiddle = middle(direction, a); |
| LayoutUnit bMiddle = middle(direction, b); |
| |
| aEnd = end(direction, a); |
| bEnd = end(direction, b); |
| |
| // Picture of the totally aligned logic: |
| // |
| // Horizontal Vertical Horizontal Vertical |
| // **************************** ***************************** |
| // * _ * _ _ _ _ * * _ * _ _ * |
| // * |_| _ * |_|_|_|_| * * _ |_| * |_|_| * |
| // * |_|....|_| * . * * |_|....|_| * . * |
| // * |_| |_| (1) . * * |_| |_| (2) . * |
| // * |_| * _._ * * |_| * _ _._ _ * |
| // * * |_|_| * * * |_|_|_|_| * |
| // * * * * * * |
| // **************************** ***************************** |
| |
| // Horizontal Vertical Horizontal Vertical |
| // **************************** ***************************** |
| // * _......_ * _ _ _ _ * * _ * _ _ _ _ * |
| // * |_| |_| * |_|_|_|_| * * |_| _ * |_|_|_|_| * |
| // * |_| |_| * . * * |_| |_| * . * |
| // * |_| (3) . * * |_|....|_| (4) . * |
| // * * ._ _ * * * _ _. * |
| // * * |_|_| * * * |_|_| * |
| // * * * * * * |
| // **************************** ***************************** |
| |
| return ((bMiddle >= aStart && bMiddle <= aEnd) // (1) |
| || (aMiddle >= bStart && aMiddle <= bEnd) // (2) |
| || (bStart == aStart) // (3) |
| || (bEnd == aEnd)); // (4) |
| } |
| |
| // This method checks if |start| and |dest| have a partial intersection, either |
| // horizontally or vertically. |
| // * a = Current focused node's rect. |
| // * b = Focus candidate node's rect. |
| static bool areRectsPartiallyAligned(FocusDirection direction, const LayoutRect& a, const LayoutRect& b) |
| { |
| LayoutUnit aStart = start(direction, a); |
| LayoutUnit bStart = start(direction, b); |
| LayoutUnit bMiddle = middle(direction, b); |
| LayoutUnit aEnd = end(direction, a); |
| LayoutUnit bEnd = end(direction, b); |
| |
| // Picture of the partially aligned logic: |
| // |
| // Horizontal Vertical |
| // ******************************** |
| // * _ * _ _ _ * |
| // * |_| * |_|_|_| * |
| // * |_|.... _ * . . * |
| // * |_| |_| * . . * |
| // * |_|....|_| * ._._ _ * |
| // * |_| * |_|_|_| * |
| // * |_| * * |
| // * * * |
| // ******************************** |
| // |
| // ... and variants of the above cases. |
| return ((bStart >= aStart && bStart <= aEnd) |
| || (bMiddle >= aStart && bMiddle <= aEnd) |
| || (bEnd >= aStart && bEnd <= aEnd)); |
| } |
| |
| static bool areRectsMoreThanFullScreenApart(FocusDirection direction, const LayoutRect& curRect, const LayoutRect& targetRect, const LayoutSize& viewSize) |
| { |
| ASSERT(isRectInDirection(direction, curRect, targetRect)); |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| return curRect.x() - targetRect.maxX() > viewSize.width(); |
| case FocusDirectionRight: |
| return targetRect.x() - curRect.maxX() > viewSize.width(); |
| case FocusDirectionUp: |
| return curRect.y() - targetRect.maxY() > viewSize.height(); |
| case FocusDirectionDown: |
| return targetRect.y() - curRect.maxY() > viewSize.height(); |
| default: |
| ASSERT_NOT_REACHED(); |
| return true; |
| } |
| } |
| |
| // Return true if rect |a| is below |b|. False otherwise. |
| static inline bool below(const LayoutRect& a, const LayoutRect& b) |
| { |
| return a.y() > b.maxY(); |
| } |
| |
| // Return true if rect |a| is on the right of |b|. False otherwise. |
| static inline bool rightOf(const LayoutRect& a, const LayoutRect& b) |
| { |
| return a.x() > b.maxX(); |
| } |
| |
| static bool isRectInDirection(FocusDirection direction, const LayoutRect& curRect, const LayoutRect& targetRect) |
| { |
| switch (direction) { |
| case FocusDirectionLeft: |
| return targetRect.maxX() <= curRect.x(); |
| case FocusDirectionRight: |
| return targetRect.x() >= curRect.maxX(); |
| case FocusDirectionUp: |
| return targetRect.maxY() <= curRect.y(); |
| case FocusDirectionDown: |
| return targetRect.y() >= curRect.maxY(); |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| } |
| |
| // Checks if |node| is offscreen the visible area (viewport) of its container |
| // document. In case it is, one can scroll in direction or take any different |
| // desired action later on. |
| bool hasOffscreenRect(Node* node, FocusDirection direction) |
| { |
| // Get the FrameView in which |node| is (which means the current viewport if |node| |
| // is not in an inner document), so we can check if its content rect is visible |
| // before we actually move the focus to it. |
| FrameView* frameView = node->document()->view(); |
| if (!frameView) |
| return true; |
| |
| ASSERT(!frameView->needsLayout()); |
| |
| LayoutRect containerViewportRect = frameView->visibleContentRect(); |
| // We want to select a node if it is currently off screen, but will be |
| // exposed after we scroll. Adjust the viewport to post-scrolling position. |
| // If the container has overflow:hidden, we cannot scroll, so we do not pass direction |
| // and we do not adjust for scrolling. |
| switch (direction) { |
| case FocusDirectionLeft: |
| containerViewportRect.setX(containerViewportRect.x() - Scrollbar::pixelsPerLineStep()); |
| containerViewportRect.setWidth(containerViewportRect.width() + Scrollbar::pixelsPerLineStep()); |
| break; |
| case FocusDirectionRight: |
| containerViewportRect.setWidth(containerViewportRect.width() + Scrollbar::pixelsPerLineStep()); |
| break; |
| case FocusDirectionUp: |
| containerViewportRect.setY(containerViewportRect.y() - Scrollbar::pixelsPerLineStep()); |
| containerViewportRect.setHeight(containerViewportRect.height() + Scrollbar::pixelsPerLineStep()); |
| break; |
| case FocusDirectionDown: |
| containerViewportRect.setHeight(containerViewportRect.height() + Scrollbar::pixelsPerLineStep()); |
| break; |
| default: |
| break; |
| } |
| |
| RenderObject* render = node->renderer(); |
| if (!render) |
| return true; |
| |
| LayoutRect rect(render->absoluteClippedOverflowRect()); |
| if (rect.isEmpty()) |
| return true; |
| |
| return !containerViewportRect.intersects(rect); |
| } |
| |
| bool scrollInDirection(Frame* frame, FocusDirection direction) |
| { |
| ASSERT(frame); |
| |
| if (frame && canScrollInDirection(frame->document(), direction)) { |
| LayoutUnit dx = 0; |
| LayoutUnit dy = 0; |
| switch (direction) { |
| case FocusDirectionLeft: |
| dx = - Scrollbar::pixelsPerLineStep(); |
| break; |
| case FocusDirectionRight: |
| dx = Scrollbar::pixelsPerLineStep(); |
| break; |
| case FocusDirectionUp: |
| dy = - Scrollbar::pixelsPerLineStep(); |
| break; |
| case FocusDirectionDown: |
| dy = Scrollbar::pixelsPerLineStep(); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| frame->view()->scrollBy(IntSize(dx, dy)); |
| return true; |
| } |
| return false; |
| } |
| |
| bool scrollInDirection(Node* container, FocusDirection direction) |
| { |
| ASSERT(container); |
| if (container->isDocumentNode()) |
| return scrollInDirection(toDocument(container)->frame(), direction); |
| |
| if (!container->renderBox()) |
| return false; |
| |
| if (canScrollInDirection(container, direction)) { |
| LayoutUnit dx = 0; |
| LayoutUnit dy = 0; |
| switch (direction) { |
| case FocusDirectionLeft: |
| dx = - min<LayoutUnit>(Scrollbar::pixelsPerLineStep(), container->renderBox()->scrollLeft()); |
| break; |
| case FocusDirectionRight: |
| ASSERT(container->renderBox()->scrollWidth() > (container->renderBox()->scrollLeft() + container->renderBox()->clientWidth())); |
| dx = min<LayoutUnit>(Scrollbar::pixelsPerLineStep(), container->renderBox()->scrollWidth() - (container->renderBox()->scrollLeft() + container->renderBox()->clientWidth())); |
| break; |
| case FocusDirectionUp: |
| dy = - min<LayoutUnit>(Scrollbar::pixelsPerLineStep(), container->renderBox()->scrollTop()); |
| break; |
| case FocusDirectionDown: |
| ASSERT(container->renderBox()->scrollHeight() - (container->renderBox()->scrollTop() + container->renderBox()->clientHeight())); |
| dy = min<LayoutUnit>(Scrollbar::pixelsPerLineStep(), container->renderBox()->scrollHeight() - (container->renderBox()->scrollTop() + container->renderBox()->clientHeight())); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| |
| container->renderBox()->enclosingLayer()->scrollByRecursively(IntSize(dx, dy)); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| static void deflateIfOverlapped(LayoutRect& a, LayoutRect& b) |
| { |
| if (!a.intersects(b) || a.contains(b) || b.contains(a)) |
| return; |
| |
| LayoutUnit deflateFactor = -fudgeFactor(); |
| |
| // Avoid negative width or height values. |
| if ((a.width() + 2 * deflateFactor > 0) && (a.height() + 2 * deflateFactor > 0)) |
| a.inflate(deflateFactor); |
| |
| if ((b.width() + 2 * deflateFactor > 0) && (b.height() + 2 * deflateFactor > 0)) |
| b.inflate(deflateFactor); |
| } |
| |
| bool isScrollableNode(const Node* node) |
| { |
| ASSERT(!node->isDocumentNode()); |
| |
| if (!node) |
| return false; |
| |
| if (RenderObject* renderer = node->renderer()) |
| return renderer->isBox() && toRenderBox(renderer)->canBeScrolledAndHasScrollableArea() && node->hasChildNodes(); |
| |
| return false; |
| } |
| |
| Node* scrollableEnclosingBoxOrParentFrameForNodeInDirection(FocusDirection direction, Node* node) |
| { |
| ASSERT(node); |
| Node* parent = node; |
| do { |
| if (parent->isDocumentNode()) |
| parent = toDocument(parent)->document()->frame()->ownerElement(); |
| else |
| parent = parent->parentNode(); |
| } while (parent && !canScrollInDirection(parent, direction) && !parent->isDocumentNode()); |
| |
| return parent; |
| } |
| |
| bool canScrollInDirection(const Node* container, FocusDirection direction) |
| { |
| ASSERT(container); |
| if (container->isDocumentNode()) |
| return canScrollInDirection(toDocument(container)->frame(), direction); |
| |
| if (!isScrollableNode(container)) |
| return false; |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| return (container->renderer()->style()->overflowX() != OHIDDEN && container->renderBox()->scrollLeft() > 0); |
| case FocusDirectionUp: |
| return (container->renderer()->style()->overflowY() != OHIDDEN && container->renderBox()->scrollTop() > 0); |
| case FocusDirectionRight: |
| return (container->renderer()->style()->overflowX() != OHIDDEN && container->renderBox()->scrollLeft() + container->renderBox()->clientWidth() < container->renderBox()->scrollWidth()); |
| case FocusDirectionDown: |
| return (container->renderer()->style()->overflowY() != OHIDDEN && container->renderBox()->scrollTop() + container->renderBox()->clientHeight() < container->renderBox()->scrollHeight()); |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| } |
| |
| bool canScrollInDirection(const Frame* frame, FocusDirection direction) |
| { |
| if (!frame->view()) |
| return false; |
| ScrollbarMode verticalMode; |
| ScrollbarMode horizontalMode; |
| frame->view()->calculateScrollbarModesForLayout(horizontalMode, verticalMode); |
| if ((direction == FocusDirectionLeft || direction == FocusDirectionRight) && ScrollbarAlwaysOff == horizontalMode) |
| return false; |
| if ((direction == FocusDirectionUp || direction == FocusDirectionDown) && ScrollbarAlwaysOff == verticalMode) |
| return false; |
| LayoutSize size = frame->view()->totalContentsSize(); |
| LayoutSize offset = frame->view()->scrollOffset(); |
| LayoutRect rect = frame->view()->visibleContentRect(ScrollableArea::IncludeScrollbars); |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| return offset.width() > 0; |
| case FocusDirectionUp: |
| return offset.height() > 0; |
| case FocusDirectionRight: |
| return rect.width() + offset.width() < size.width(); |
| case FocusDirectionDown: |
| return rect.height() + offset.height() < size.height(); |
| default: |
| ASSERT_NOT_REACHED(); |
| return false; |
| } |
| } |
| |
| static LayoutRect rectToAbsoluteCoordinates(Frame* initialFrame, const LayoutRect& initialRect) |
| { |
| LayoutRect rect = initialRect; |
| for (Frame* frame = initialFrame; frame; frame = frame->tree()->parent()) { |
| if (Element* element = frame->ownerElement()) { |
| do { |
| rect.move(element->offsetLeft(), element->offsetTop()); |
| } while ((element = element->offsetParent())); |
| rect.move((-frame->view()->scrollOffset())); |
| } |
| } |
| return rect; |
| } |
| |
| LayoutRect nodeRectInAbsoluteCoordinates(Node* node, bool ignoreBorder) |
| { |
| ASSERT(node && node->renderer() && !node->document()->view()->needsLayout()); |
| |
| if (node->isDocumentNode()) |
| return frameRectInAbsoluteCoordinates(toDocument(node)->frame()); |
| LayoutRect rect = rectToAbsoluteCoordinates(node->document()->frame(), node->boundingBox()); |
| |
| // For authors that use border instead of outline in their CSS, we compensate by ignoring the border when calculating |
| // the rect of the focused element. |
| if (ignoreBorder) { |
| rect.move(node->renderer()->style()->borderLeftWidth(), node->renderer()->style()->borderTopWidth()); |
| rect.setWidth(rect.width() - node->renderer()->style()->borderLeftWidth() - node->renderer()->style()->borderRightWidth()); |
| rect.setHeight(rect.height() - node->renderer()->style()->borderTopWidth() - node->renderer()->style()->borderBottomWidth()); |
| } |
| return rect; |
| } |
| |
| LayoutRect frameRectInAbsoluteCoordinates(Frame* frame) |
| { |
| return rectToAbsoluteCoordinates(frame, frame->view()->visibleContentRect()); |
| } |
| |
| // This method calculates the exitPoint from the startingRect and the entryPoint into the candidate rect. |
| // The line between those 2 points is the closest distance between the 2 rects. |
| void entryAndExitPointsForDirection(FocusDirection direction, const LayoutRect& startingRect, const LayoutRect& potentialRect, LayoutPoint& exitPoint, LayoutPoint& entryPoint) |
| { |
| switch (direction) { |
| case FocusDirectionLeft: |
| exitPoint.setX(startingRect.x()); |
| entryPoint.setX(potentialRect.maxX()); |
| break; |
| case FocusDirectionUp: |
| exitPoint.setY(startingRect.y()); |
| entryPoint.setY(potentialRect.maxY()); |
| break; |
| case FocusDirectionRight: |
| exitPoint.setX(startingRect.maxX()); |
| entryPoint.setX(potentialRect.x()); |
| break; |
| case FocusDirectionDown: |
| exitPoint.setY(startingRect.maxY()); |
| entryPoint.setY(potentialRect.y()); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| case FocusDirectionRight: |
| if (below(startingRect, potentialRect)) { |
| exitPoint.setY(startingRect.y()); |
| entryPoint.setY(potentialRect.maxY()); |
| } else if (below(potentialRect, startingRect)) { |
| exitPoint.setY(startingRect.maxY()); |
| entryPoint.setY(potentialRect.y()); |
| } else { |
| exitPoint.setY(max(startingRect.y(), potentialRect.y())); |
| entryPoint.setY(exitPoint.y()); |
| } |
| break; |
| case FocusDirectionUp: |
| case FocusDirectionDown: |
| if (rightOf(startingRect, potentialRect)) { |
| exitPoint.setX(startingRect.x()); |
| entryPoint.setX(potentialRect.maxX()); |
| } else if (rightOf(potentialRect, startingRect)) { |
| exitPoint.setX(startingRect.maxX()); |
| entryPoint.setX(potentialRect.x()); |
| } else { |
| exitPoint.setX(max(startingRect.x(), potentialRect.x())); |
| entryPoint.setX(exitPoint.x()); |
| } |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| } |
| |
| bool areElementsOnSameLine(const FocusCandidate& firstCandidate, const FocusCandidate& secondCandidate) |
| { |
| if (firstCandidate.isNull() || secondCandidate.isNull()) |
| return false; |
| |
| if (!firstCandidate.visibleNode->renderer() || !secondCandidate.visibleNode->renderer()) |
| return false; |
| |
| if (!firstCandidate.rect.intersects(secondCandidate.rect)) |
| return false; |
| |
| if (firstCandidate.focusableNode->hasTagName(HTMLNames::areaTag) || secondCandidate.focusableNode->hasTagName(HTMLNames::areaTag)) |
| return false; |
| |
| if (!firstCandidate.visibleNode->renderer()->isRenderInline() || !secondCandidate.visibleNode->renderer()->isRenderInline()) |
| return false; |
| |
| if (firstCandidate.visibleNode->renderer()->containingBlock() != secondCandidate.visibleNode->renderer()->containingBlock()) |
| return false; |
| |
| return true; |
| } |
| |
| void distanceDataForNode(FocusDirection direction, const FocusCandidate& current, FocusCandidate& candidate) |
| { |
| if (areElementsOnSameLine(current, candidate)) { |
| if ((direction == FocusDirectionUp && current.rect.y() > candidate.rect.y()) || (direction == FocusDirectionDown && candidate.rect.y() > current.rect.y())) { |
| candidate.distance = 0; |
| candidate.alignment = Full; |
| return; |
| } |
| } |
| |
| LayoutRect nodeRect = candidate.rect; |
| LayoutRect currentRect = current.rect; |
| deflateIfOverlapped(currentRect, nodeRect); |
| |
| if (!isRectInDirection(direction, currentRect, nodeRect)) |
| return; |
| |
| LayoutPoint exitPoint; |
| LayoutPoint entryPoint; |
| LayoutUnit sameAxisDistance = 0; |
| LayoutUnit otherAxisDistance = 0; |
| entryAndExitPointsForDirection(direction, currentRect, nodeRect, exitPoint, entryPoint); |
| |
| switch (direction) { |
| case FocusDirectionLeft: |
| sameAxisDistance = exitPoint.x() - entryPoint.x(); |
| otherAxisDistance = absoluteValue(exitPoint.y() - entryPoint.y()); |
| break; |
| case FocusDirectionUp: |
| sameAxisDistance = exitPoint.y() - entryPoint.y(); |
| otherAxisDistance = absoluteValue(exitPoint.x() - entryPoint.x()); |
| break; |
| case FocusDirectionRight: |
| sameAxisDistance = entryPoint.x() - exitPoint.x(); |
| otherAxisDistance = absoluteValue(entryPoint.y() - exitPoint.y()); |
| break; |
| case FocusDirectionDown: |
| sameAxisDistance = entryPoint.y() - exitPoint.y(); |
| otherAxisDistance = absoluteValue(entryPoint.x() - exitPoint.x()); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| return; |
| } |
| |
| float x = (entryPoint.x() - exitPoint.x()) * (entryPoint.x() - exitPoint.x()); |
| float y = (entryPoint.y() - exitPoint.y()) * (entryPoint.y() - exitPoint.y()); |
| |
| float euclidianDistance = sqrt(x + y); |
| |
| // Loosely based on http://www.w3.org/TR/WICD/#focus-handling |
| // df = dotDist + dx + dy + 2 * (xdisplacement + ydisplacement) - sqrt(Overlap) |
| |
| float distance = euclidianDistance + sameAxisDistance + 2 * otherAxisDistance; |
| candidate.distance = roundf(distance); |
| LayoutSize viewSize = candidate.visibleNode->document()->page()->mainFrame()->view()->visibleContentRect().size(); |
| candidate.alignment = alignmentForRects(direction, currentRect, nodeRect, viewSize); |
| } |
| |
| bool canBeScrolledIntoView(FocusDirection direction, const FocusCandidate& candidate) |
| { |
| ASSERT(candidate.visibleNode && candidate.isOffscreen); |
| LayoutRect candidateRect = candidate.rect; |
| for (Node* parentNode = candidate.visibleNode->parentNode(); parentNode; parentNode = parentNode->parentNode()) { |
| LayoutRect parentRect = nodeRectInAbsoluteCoordinates(parentNode); |
| if (!candidateRect.intersects(parentRect)) { |
| if (((direction == FocusDirectionLeft || direction == FocusDirectionRight) && parentNode->renderer()->style()->overflowX() == OHIDDEN) |
| || ((direction == FocusDirectionUp || direction == FocusDirectionDown) && parentNode->renderer()->style()->overflowY() == OHIDDEN)) |
| return false; |
| } |
| if (parentNode == candidate.enclosingScrollableBox) |
| return canScrollInDirection(parentNode, direction); |
| } |
| return true; |
| } |
| |
| // The starting rect is the rect of the focused node, in document coordinates. |
| // Compose a virtual starting rect if there is no focused node or if it is off screen. |
| // The virtual rect is the edge of the container or frame. We select which |
| // edge depending on the direction of the navigation. |
| LayoutRect virtualRectForDirection(FocusDirection direction, const LayoutRect& startingRect, LayoutUnit width) |
| { |
| LayoutRect virtualStartingRect = startingRect; |
| switch (direction) { |
| case FocusDirectionLeft: |
| virtualStartingRect.setX(virtualStartingRect.maxX() - width); |
| virtualStartingRect.setWidth(width); |
| break; |
| case FocusDirectionUp: |
| virtualStartingRect.setY(virtualStartingRect.maxY() - width); |
| virtualStartingRect.setHeight(width); |
| break; |
| case FocusDirectionRight: |
| virtualStartingRect.setWidth(width); |
| break; |
| case FocusDirectionDown: |
| virtualStartingRect.setHeight(width); |
| break; |
| default: |
| ASSERT_NOT_REACHED(); |
| } |
| |
| return virtualStartingRect; |
| } |
| |
| LayoutRect virtualRectForAreaElementAndDirection(HTMLAreaElement* area, FocusDirection direction) |
| { |
| ASSERT(area); |
| ASSERT(area->imageElement()); |
| // Area elements tend to overlap more than other focusable elements. We flatten the rect of the area elements |
| // to minimize the effect of overlapping areas. |
| LayoutRect rect = virtualRectForDirection(direction, rectToAbsoluteCoordinates(area->document()->frame(), area->computeRect(area->imageElement()->renderer())), 1); |
| return rect; |
| } |
| |
| HTMLFrameOwnerElement* frameOwnerElement(FocusCandidate& candidate) |
| { |
| return candidate.isFrameOwnerElement() ? static_cast<HTMLFrameOwnerElement*>(candidate.visibleNode) : 0; |
| }; |
| |
| } // namespace WebCore |
