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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 
     27 namespace WebCore {
     28 
     29 static PassRefPtr<StringImpl> newlineString()
     30 {
     31     DEFINE_STATIC_LOCAL(const String, string, ("\n"));
     32     return string.impl();
     33 }
     34 
     35 RenderBR::RenderBR(Node* node)
     36     : RenderText(node, newlineString())
     37     , m_lineHeight(-1)
     38 {
     39 }
     40 
     41 RenderBR::~RenderBR()
     42 {
     43 }
     44 
     45 int RenderBR::lineHeight(bool firstLine) const
     46 {
     47     if (firstLine && document()->styleSheetCollection()->usesFirstLineRules()) {
     48         RenderStyle* s = style(firstLine);
     49         if (s != style())
     50             return s->computedLineHeight(view());
     51     }
     52 
     53     if (m_lineHeight == -1)
     54         m_lineHeight = style()->computedLineHeight(view());
     55 
     56     return m_lineHeight;
     57 }
     58 
     59 void RenderBR::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     60 {
     61     RenderText::styleDidChange(diff, oldStyle);
     62     m_lineHeight = -1;
     63 }
     64 
     65 int RenderBR::caretMinOffset() const
     66 {
     67     return 0;
     68 }
     69 
     70 int RenderBR::caretMaxOffset() const
     71 {
     72     return 1;
     73 }
     74 
     75 PositionWithAffinity RenderBR::positionForPoint(const LayoutPoint&)
     76 {
     77     return createPositionWithAffinity(0, DOWNSTREAM);
     78 }
     79 
     80 } // namespace WebCore
     81