Rename WebCore::ScrollBehavior to ScrollAlignmentBehavior

Source/core/rendering/ScrollBehavior.cpp

-/*
- * Copyright (C) 2006, 2007, 2008 Apple Inc. All rights reserved.
- *
- * Portions are Copyright (C) 1998 Netscape Communications Corporation.
- *
- * Other contributors:
- *   Robert O'Callahan <roc+@cs.cmu.edu>
- *   David Baron <dbaron@fas.harvard.edu>
- *   Christian Biesinger <cbiesinger@web.de>
- *   Randall Jesup <rjesup@wgate.com>
- *   Roland Mainz <roland.mainz@informatik.med.uni-giessen.de>
- *   Josh Soref <timeless@mac.com>
- *   Boris Zbarsky <bzbarsky@mit.edu>
- *
- * This library is free software; you can redistribute it and/or
- * modify it under the terms of the GNU Lesser General Public
- * License as published by the Free Software Foundation; either
- * version 2.1 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
- * Lesser General Public License for more details.
- *
- * You should have received a copy of the GNU Lesser General Public
- * License along with this library; if not, write to the Free Software
- * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
- *
- * Alternatively, the contents of this file may be used under the terms
- * of either the Mozilla Public License Version 1.1, found at
- * http://www.mozilla.org/MPL/ (the "MPL") or the GNU General Public
- * License Version 2.0, found at http://www.fsf.org/copyleft/gpl.html
- * (the "GPL"), in which case the provisions of the MPL or the GPL are
- * applicable instead of those above.  If you wish to allow use of your
- * version of this file only under the terms of one of those two
- * licenses (the MPL or the GPL) and not to allow others to use your
- * version of this file under the LGPL, indicate your decision by
- * deletingthe provisions above and replace them with the notice and
- * other provisions required by the MPL or the GPL, as the case may be.
- * If you do not delete the provisions above, a recipient may use your
- * version of this file under any of the LGPL, the MPL or the GPL.
- */
-
-#include "config.h"
-#include "core/rendering/ScrollBehavior.h"
-
-#include "platform/geometry/LayoutRect.h"
-
-namespace WebCore {
-
-const ScrollAlignment ScrollAlignment::alignCenterIfNeeded = { noScroll, alignCenter, alignToClosestEdge };
-const ScrollAlignment ScrollAlignment::alignToEdgeIfNeeded = { noScroll, alignToClosestEdge, alignToClosestEdge };
-const ScrollAlignment ScrollAlignment::alignCenterAlways = { alignCenter, alignCenter, alignCenter };
-const ScrollAlignment ScrollAlignment::alignTopAlways = { alignTop, alignTop, alignTop };
-const ScrollAlignment ScrollAlignment::alignBottomAlways = { alignBottom, alignBottom, alignBottom };
-
-#define MIN_INTERSECT_FOR_REVEAL 32
-
-LayoutRect ScrollAlignment::getRectToExpose(const LayoutRect& visibleRect, const LayoutRect& exposeRect, const ScrollAlignment& alignX, const ScrollAlignment& alignY)
-{
-    // Determine the appropriate X behavior.
-    ScrollBehavior scrollX;
-    LayoutRect exposeRectX(exposeRect.x(), visibleRect.y(), exposeRect.width(), visibleRect.height());
-    LayoutUnit intersectWidth = intersection(visibleRect, exposeRectX).width();
-    if (intersectWidth == exposeRect.width() || intersectWidth >= MIN_INTERSECT_FOR_REVEAL) {
-        // If the rectangle is fully visible, use the specified visible behavior.
-        // If the rectangle is partially visible, but over a certain threshold,
-        // then treat it as fully visible to avoid unnecessary horizontal scrolling
-        scrollX = getVisibleBehavior(alignX);
-    } else if (intersectWidth == visibleRect.width()) {
-        // If the rect is bigger than the visible area, don't bother trying to center. Other alignments will work.
-        scrollX = getVisibleBehavior(alignX);
-        if (scrollX == alignCenter)
-            scrollX = noScroll;
-    } else if (intersectWidth > 0) {
-        // If the rectangle is partially visible, but not above the minimum threshold, use the specified partial behavior
-        scrollX = getPartialBehavior(alignX);
-    } else {
-        scrollX = getHiddenBehavior(alignX);
-    }
-
-    if (scrollX == alignToClosestEdge) {
-        // Closest edge is the right in two cases:
-        // (1) exposeRect to the right of and smaller than visibleRect
-        // (2) exposeRect to the left of and larger than visibleRect
-        if ((exposeRect.maxX() > visibleRect.maxX() && exposeRect.width() < visibleRect.width())
-            || (exposeRect.maxX() < visibleRect.maxX() && exposeRect.width() > visibleRect.width())) {
-            scrollX = alignRight;
-        }
-    }
-
-    // Given the X behavior, compute the X coordinate.
-    LayoutUnit x;
-    if (scrollX == noScroll)
-        x = visibleRect.x();
-    else if (scrollX == alignRight)
-        x = exposeRect.maxX() - visibleRect.width();
-    else if (scrollX == alignCenter)
-        x = exposeRect.x() + (exposeRect.width() - visibleRect.width()) / 2;
-    else
-        x = exposeRect.x();
-
-    // Determine the appropriate Y behavior.
-    ScrollBehavior scrollY;
-    LayoutRect exposeRectY(visibleRect.x(), exposeRect.y(), visibleRect.width(), exposeRect.height());
-    LayoutUnit intersectHeight = intersection(visibleRect, exposeRectY).height();
-    if (intersectHeight == exposeRect.height()) {
-        // If the rectangle is fully visible, use the specified visible behavior.
-        scrollY = getVisibleBehavior(alignY);
-    } else if (intersectHeight == visibleRect.height()) {
-        // If the rect is bigger than the visible area, don't bother trying to center. Other alignments will work.
-        scrollY = getVisibleBehavior(alignY);
-        if (scrollY == alignCenter)
-            scrollY = noScroll;
-    } else if (intersectHeight > 0) {
-        // If the rectangle is partially visible, use the specified partial behavior
-        scrollY = getPartialBehavior(alignY);
-    } else {
-        scrollY = getHiddenBehavior(alignY);
-    }
-
-    if (scrollY == alignToClosestEdge) {
-        // Closest edge is the bottom in two cases:
-        // (1) exposeRect below and smaller than visibleRect
-        // (2) exposeRect above and larger than visibleRect
-        if ((exposeRect.maxY() > visibleRect.maxY() && exposeRect.height() < visibleRect.height())
-            || (exposeRect.maxY() < visibleRect.maxY() && exposeRect.height() > visibleRect.height())) {
-            scrollY = alignBottom;
-        }
-    }
-
-    // Given the Y behavior, compute the Y coordinate.
-    LayoutUnit y;
-    if (scrollY == noScroll)
-        y = visibleRect.y();
-    else if (scrollY == alignBottom)
-        y = exposeRect.maxY() - visibleRect.height();
-    else if (scrollY == alignCenter)
-        y = exposeRect.y() + (exposeRect.height() - visibleRect.height()) / 2;
-    else
-        y = exposeRect.y();
-
-    return LayoutRect(LayoutPoint(x, y), visibleRect.size());
-}
-
-}; // namespace WebCore