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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 "RenderBR.h"
     24 
     25 #include "Document.h"
     26 #include "InlineTextBox.h"
     27 #include "VisiblePosition.h"
     28 
     29 namespace WebCore {
     30 
     31 RenderBR::RenderBR(Node* node)
     32     : RenderText(node, StringImpl::create("\n"))
     33     , m_lineHeight(-1)
     34 {
     35 }
     36 
     37 RenderBR::~RenderBR()
     38 {
     39 }
     40 
     41 int RenderBR::baselinePosition(bool firstLine, bool isRootLineBox) const
     42 {
     43     if (firstTextBox() && !firstTextBox()->isText())
     44         return 0;
     45     return RenderText::baselinePosition(firstLine, isRootLineBox);
     46 }
     47 
     48 int RenderBR::lineHeight(bool firstLine, bool /*isRootLineBox*/) const
     49 {
     50     if (firstTextBox() && !firstTextBox()->isText())
     51         return 0;
     52 
     53     if (firstLine) {
     54         RenderStyle* s = style(firstLine);
     55         Length lh = s->lineHeight();
     56         if (lh.isNegative()) {
     57             if (s == style()) {
     58                 if (m_lineHeight == -1)
     59                     m_lineHeight = RenderObject::lineHeight(false);
     60                 return m_lineHeight;
     61             }
     62             return s->font().lineSpacing();
     63         }
     64         if (lh.isPercent())
     65             return lh.calcMinValue(s->fontSize());
     66         return lh.value();
     67     }
     68 
     69     if (m_lineHeight == -1)
     70         m_lineHeight = RenderObject::lineHeight(false);
     71     return m_lineHeight;
     72 }
     73 
     74 void RenderBR::styleDidChange(StyleDifference diff, const RenderStyle* oldStyle)
     75 {
     76     RenderText::styleDidChange(diff, oldStyle);
     77     m_lineHeight = -1;
     78 }
     79 
     80 int RenderBR::caretMinOffset() const
     81 {
     82     return 0;
     83 }
     84 
     85 int RenderBR::caretMaxOffset() const
     86 {
     87     return 1;
     88 }
     89 
     90 unsigned RenderBR::caretMaxRenderedOffset() const
     91 {
     92     return 1;
     93 }
     94 
     95 VisiblePosition RenderBR::positionForPoint(const IntPoint&)
     96 {
     97     return createVisiblePosition(0, DOWNSTREAM);
     98 }
     99 
    100 } // namespace WebCore
    101