1 /* 2 * Copyright (C) 2003, 2009 Apple Inc. All rights reserved. 3 * 4 * Portions are Copyright (C) 1998 Netscape Communications Corporation. 5 * 6 * Other contributors: 7 * Robert O'Callahan <roc+@cs.cmu.edu> 8 * David Baron <dbaron (at) fas.harvard.edu> 9 * Christian Biesinger <cbiesinger (at) web.de> 10 * Randall Jesup <rjesup (at) wgate.com> 11 * Roland Mainz <roland.mainz (at) informatik.med.uni-giessen.de> 12 * Josh Soref <timeless (at) mac.com> 13 * Boris Zbarsky <bzbarsky (at) mit.edu> 14 * 15 * This library is free software; you can redistribute it and/or 16 * modify it under the terms of the GNU Lesser General Public 17 * License as published by the Free Software Foundation; either 18 * version 2.1 of the License, or (at your option) any later version. 19 * 20 * This library is distributed in the hope that it will be useful, 21 * but WITHOUT ANY WARRANTY; without even the implied warranty of 22 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 23 * Lesser General Public License for more details. 24 * 25 * You should have received a copy of the GNU Lesser General Public 26 * License along with this library; if not, write to the Free Software 27 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA 28 * 29 * Alternatively, the contents of this file may be used under the terms 30 * of either the Mozilla Public License Version 1.1, found at 31 * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public 32 * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html 33 * (the "GPL"), in which case the provisions of the MPL or the GPL are 34 * applicable instead of those above. If you wish to allow use of your 35 * version of this file only under the terms of one of those two 36 * licenses (the MPL or the GPL) and not to allow others to use your 37 * version of this file under the LGPL, indicate your decision by 38 * deletingthe provisions above and replace them with the notice and 39 * other provisions required by the MPL or the GPL, as the case may be. 40 * If you do not delete the provisions above, a recipient may use your 41 * version of this file under any of the LGPL, the MPL or the GPL. 42 */ 43 44 #ifndef ScrollAlignment_h 45 #define ScrollAlignment_h 46 47 namespace blink { 48 49 enum ScrollAlignmentBehavior { 50 ScrollAlignmentNoScroll, 51 ScrollAlignmentCenter, 52 ScrollAlignmentTop, 53 ScrollAlignmentBottom, 54 ScrollAlignmentLeft, 55 ScrollAlignmentRight, 56 ScrollAlignmentClosestEdge 57 }; 58 59 class LayoutRect; 60 61 struct ScrollAlignment { 62 static ScrollAlignmentBehavior getVisibleBehavior(const ScrollAlignment& s) { return s.m_rectVisible; } 63 static ScrollAlignmentBehavior getPartialBehavior(const ScrollAlignment& s) { return s.m_rectPartial; } 64 static ScrollAlignmentBehavior getHiddenBehavior(const ScrollAlignment& s) { return s.m_rectHidden; } 65 66 // FIXME: This function should probably go somewhere else but where? 67 static LayoutRect getRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY); 68 69 static const ScrollAlignment alignCenterIfNeeded; 70 static const ScrollAlignment alignToEdgeIfNeeded; 71 static const ScrollAlignment alignCenterAlways; 72 static const ScrollAlignment alignTopAlways; 73 static const ScrollAlignment alignBottomAlways; 74 75 ScrollAlignmentBehavior m_rectVisible; 76 ScrollAlignmentBehavior m_rectHidden; 77 ScrollAlignmentBehavior m_rectPartial; 78 }; 79 80 81 }; // namespace blink 82 83 #endif // ScrollAlignment_h 84
