author | Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com> |
Tue, 06 Jul 2010 15:10:48 +0300 | |
changeset 30 | 5dc02b23752f |
child 33 | 3e2da88830cd |
permissions | -rw-r--r-- |
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/* |
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* Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies) |
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* Copyright (C) 2009 Antonio Gomes <tonikitoo@webkit.org> |
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* |
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* This library is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Library General Public |
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* License as published by the Free Software Foundation; either |
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* version 2 of the License, or (at your option) any later version. |
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* |
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* This library is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Library General Public License for more details. |
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* |
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* You should have received a copy of the GNU Library General Public License |
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* along with this library; see the file COPYING.LIB. If not, write to |
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* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, |
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* Boston, MA 02110-1301, USA. |
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*/ |
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#ifndef SpatialNavigation_h |
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#define SpatialNavigation_h |
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#include "FocusDirection.h" |
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#include "Node.h" |
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#include <limits> |
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namespace WebCore { |
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class Element; |
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class Frame; |
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class IntRect; |
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class RenderObject; |
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using namespace std; |
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inline long long maxDistance() |
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{ |
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return numeric_limits<long long>::max(); |
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} |
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inline unsigned int fudgeFactor() |
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{ |
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return 2; |
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} |
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// Spatially speaking, two given elements in a web page can be: |
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// 1) Fully aligned: There is a full intersection between the rects, either |
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// vertically or horizontally. |
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// |
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// * Horizontally * Vertically |
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// _ |
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// |_| _ _ _ _ _ _ |
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// |_|...... _ |_|_|_|_|_|_| |
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// |_| |_| . . |
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// |_|......|_| OR . . |
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// |_| |_| . . |
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// |_|......|_| _ _ _ _ |
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// |_| |_|_|_|_| |
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// |
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// |
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// 2) Partially aligned: There is a partial intersection between the rects, either |
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// vertically or horizontally. |
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// |
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// * Horizontally * Vertically |
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// _ _ _ _ _ _ |
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// |_| |_|_|_|_|_| |
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// |_|.... _ OR . . |
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// |_| |_| . . |
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// |_|....|_| ._._ _ |
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// |_| |_|_|_| |
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// |_| |
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// |
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// 3) Or, otherwise, not aligned at all. |
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// |
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// * Horizontally * Vertically |
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// _ _ _ _ _ |
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// |_| |_|_|_|_| |
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// |_| . |
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// |_| . |
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// . OR . |
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// _ . ._ _ _ _ _ |
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// |_| |_|_|_|_|_| |
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// |_| |
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// |_| |
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// |
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// "Totally Aligned" elements are preferable candidates to move |
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// focus to over "Partially Aligned" ones, that on its turns are |
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// more preferable than "Not Aligned". |
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enum RectsAlignment { |
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None = 0, |
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Partial, |
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Full |
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}; |
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|
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struct FocusCandidate { |
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FocusCandidate() |
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: node(0) |
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, distance(maxDistance()) |
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, parentDistance(maxDistance()) |
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, alignment(None) |
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, parentAlignment(None) |
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{ |
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} |
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FocusCandidate(Node* n) |
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: node(n) |
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, distance(maxDistance()) |
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, parentDistance(maxDistance()) |
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, alignment(None) |
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, parentAlignment(None) |
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{ |
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} |
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bool isNull() const { return !node; } |
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Document* document() const { return node ? node->document() : 0; } |
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Node* node; |
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long long distance; |
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long long parentDistance; |
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RectsAlignment alignment; |
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RectsAlignment parentAlignment; |
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}; |
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void distanceDataForNode(FocusDirection direction, Node* start, FocusCandidate& candidate); |
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bool scrollInDirection(Frame*, FocusDirection); |
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void scrollIntoView(Element*); |
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bool hasOffscreenRect(Node*); |
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bool isInRootDocument(Node*); |
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} // namspace WebCore |
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#endif // SpatialNavigation_h |