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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;
inline double MaxDistance() {
return std::numeric_limits<double>::max();
}
inline int FudgeFactor() {
return 2;
}
CORE_EXPORT bool IsSpatialNavigationEnabled(const LocalFrame*);
bool SpatialNavigationIgnoresEventHandlers(const LocalFrame*);
struct FocusCandidate {
STACK_ALLOCATED();
public:
FocusCandidate()
: visible_node(nullptr),
focusable_node(nullptr),
enclosing_scrollable_box(nullptr),
distance(MaxDistance()),
is_offscreen(true),
is_offscreen_after_scrolling(true) {}
FocusCandidate(Node*, WebFocusType);
explicit FocusCandidate(HTMLAreaElement*, WebFocusType);
bool IsNull() const { return !visible_node; }
bool InScrollableContainer() const {
return visible_node && enclosing_scrollable_box;
}
bool IsFrameOwnerElement() const {
return visible_node && visible_node->IsFrameOwnerElement();
}
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;
Member<Node> enclosing_scrollable_box;
double distance;
LayoutRect rect_in_root_frame;
bool is_offscreen;
bool is_offscreen_after_scrolling;
};
CORE_EXPORT bool HasRemoteFrame(const Node*);
CORE_EXPORT bool IsOffscreen(const Node*);
CORE_EXPORT bool IsOffscreenAfterFrameScroll(const Node*, WebFocusType);
bool ScrollInDirection(LocalFrame*, WebFocusType);
bool ScrollInDirection(Node* container, WebFocusType);
bool IsNavigableContainer(const Node*, WebFocusType);
CORE_EXPORT bool IsScrollableNode(const Node* node);
CORE_EXPORT bool IsScrollableAreaOrDocument(const Node*);
CORE_EXPORT Node* ScrollableAreaOrDocumentOf(Node*);
bool CanScrollInDirection(const Node* container, WebFocusType);
bool CanScrollInDirection(const LocalFrame*, WebFocusType);
bool AreElementsOnSameLine(const FocusCandidate& first_candidate,
const FocusCandidate& second_candidate);
void DistanceDataForNode(WebFocusType,
const FocusCandidate& current,
FocusCandidate&);
CORE_EXPORT LayoutRect NodeRectInRootFrame(const Node*,
bool ignore_border = false);
CORE_EXPORT LayoutRect OppositeEdge(WebFocusType side,
const LayoutRect& box,
LayoutUnit thickness = LayoutUnit());
CORE_EXPORT LayoutRect RootViewport(const LocalFrame*);
LayoutRect StartEdgeForAreaElement(const HTMLAreaElement&, WebFocusType);
HTMLFrameOwnerElement* FrameOwnerElement(FocusCandidate&);
CORE_EXPORT LayoutRect SearchOrigin(const LayoutRect,
Node*,
const WebFocusType);
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_PAGE_SPATIAL_NAVIGATION_H_