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/*
* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies)
* Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#ifndef THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_SPATIAL_NAVIGATION_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_SPATIAL_NAVIGATION_H_
#include "third_party/blink/public/platform/web_focus_type.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/core/dom/node.h"
#include "third_party/blink/renderer/platform/geometry/layout_rect.h"
#include <limits>
namespace blink {
class LocalFrame;
class HTMLAreaElement;
class HTMLFrameOwnerElement;
enum class SpatialNavigationDirection { kNone, kUp, kRight, kDown, kLeft };
inline double MaxDistance() {
return std::numeric_limits<double>::max();
}
inline int FudgeFactor() {
return 2;
}
CORE_EXPORT bool IsSpatialNavigationEnabled(const LocalFrame*);
struct FocusCandidate {
STACK_ALLOCATED();
public:
FocusCandidate()
: visible_node(nullptr), focusable_node(nullptr), is_offscreen(true) {}
FocusCandidate(Node*, SpatialNavigationDirection);
explicit FocusCandidate(HTMLAreaElement*, SpatialNavigationDirection);
bool IsNull() const { return !visible_node; }
Document* GetDocument() const {
return visible_node ? &visible_node->GetDocument() : nullptr;
}
// We handle differently visibleNode and FocusableNode to properly handle the
// areas of imagemaps, where visibleNode would represent the image element and
// focusableNode would represent the area element. In all other cases,
// visibleNode and focusableNode are one and the same.
Member<Node> visible_node;
Member<Node> focusable_node;
LayoutRect rect_in_root_frame;
bool is_offscreen;
};
CORE_EXPORT bool HasRemoteFrame(const Node*);
CORE_EXPORT FloatRect RectInViewport(const Node&);
CORE_EXPORT bool IsOffscreen(const Node*);
bool ScrollInDirection(Node* container, SpatialNavigationDirection);
CORE_EXPORT bool IsScrollableNode(const Node* node);
CORE_EXPORT bool IsScrollableAreaOrDocument(const Node*);
CORE_EXPORT Node* ScrollableAreaOrDocumentOf(Node*);
bool CanScrollInDirection(const Node* container, SpatialNavigationDirection);
bool CanScrollInDirection(const LocalFrame*, SpatialNavigationDirection);
bool AreElementsOnSameLine(const FocusCandidate& first_candidate,
const FocusCandidate& second_candidate);
double ComputeDistanceDataForNode(SpatialNavigationDirection,
const FocusCandidate& current_interest,
const FocusCandidate& candidate);
CORE_EXPORT LayoutRect NodeRectInRootFrame(const Node*);
CORE_EXPORT LayoutRect OppositeEdge(SpatialNavigationDirection side,
const LayoutRect& box,
LayoutUnit thickness = LayoutUnit());
CORE_EXPORT LayoutRect RootViewport(const LocalFrame*);
LayoutRect StartEdgeForAreaElement(const HTMLAreaElement&,
SpatialNavigationDirection);
HTMLFrameOwnerElement* FrameOwnerElement(const FocusCandidate&);
CORE_EXPORT LayoutRect SearchOrigin(const LayoutRect,
Node*,
const SpatialNavigationDirection);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_SPATIAL_NAVIGATION_H_
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