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      1 /**
      2  * Copyright (C) 2000 Lars Knoll (knoll (at) kde.org)
      3  * Copyright (C) 2006 Apple Computer, Inc.
      4  *
      5  * This library is free software; you can redistribute it and/or
      6  * modify it under the terms of the GNU Library General Public
      7  * License as published by the Free Software Foundation; either
      8  * version 2 of the License, or (at your option) any later version.
      9  *
     10  * This library is distributed in the hope that it will be useful,
     11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
     12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
     13  * Library General Public License for more details.
     14  *
     15  * You should have received a copy of the GNU Library General Public License
     16  * along with this library; see the file COPYING.LIB.  If not, write to
     17  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
     18  * Boston, MA 02110-1301, USA.
     19  *
     20  */
     21 
     22 #include "config.h"
     23 #include "core/rendering/RenderBR.h"
     24 
     25 #include "core/dom/Document.h"
     26 #include "core/rendering/RenderView.h"
     27 
     28 namespace WebCore {
     29 
     30 static PassRefPtr<StringImpl> newlineString()
     31 {
     32     DEFINE_STATIC_LOCAL(const String, string, ("\n"));
     33     return string.impl();
     34 }
     35 
     36 RenderBR::RenderBR(Node* node)
     37     : RenderText(node, newlineString())
     38     , m_lineHeight(-1)
     39 {
     40 }
     41 
     42 RenderBR::~RenderBR()
     43 {
     44 }
     45 
     46 int RenderBR::lineHeight(bool firstLine) const
     47 {
     48     if (firstLine && document().styleEngine()->usesFirstLineRules()) {
     49         RenderStyle* s = style(firstLine);
     50         if (s != style())
     51             return s->computedLineHeight(view());
     52     }
     53 
     54     if (m_lineHeight == -1)
     55         m_lineHeight = style()->computedLineHeight(view());
     56 
     57     return m_lineHeight;
     58 }
     59 
     60 void RenderBR::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     61 {
     62     RenderText::styleDidChange(diff, oldStyle);
     63     m_lineHeight = -1;
     64 }
     65 
     66 int RenderBR::caretMinOffset() const
     67 {
     68     return 0;
     69 }
     70 
     71 int RenderBR::caretMaxOffset() const
     72 {
     73     return 1;
     74 }
     75 
     76 PositionWithAffinity RenderBR::positionForPoint(const LayoutPoint&)
     77 {
     78     return createPositionWithAffinity(0, DOWNSTREAM);
     79 }
     80 
     81 } // namespace WebCore
     82