RenderMultiColumnBlock.cpp [plain text]
#include "config.h"
#include "RenderMultiColumnBlock.h"
using namespace std;
namespace WebCore {
RenderMultiColumnBlock::RenderMultiColumnBlock(Node* node)
: RenderBlock(node)
, m_columnCount(1)
, m_columnWidth(0)
{
}
void RenderMultiColumnBlock::computeColumnCountAndWidth()
{
m_columnCount = 1;
m_columnWidth = contentLogicalWidth();
ASSERT(!style()->hasAutoColumnCount() || !style()->hasAutoColumnWidth());
LayoutUnit availWidth = m_columnWidth;
LayoutUnit colGap = columnGap();
LayoutUnit colWidth = max<LayoutUnit>(1, LayoutUnit(style()->columnWidth()));
int colCount = max<int>(1, style()->columnCount());
if (style()->hasAutoColumnWidth() && !style()->hasAutoColumnCount()) {
m_columnCount = colCount;
m_columnWidth = max<LayoutUnit>(0, (availWidth - ((m_columnCount - 1) * colGap)) / m_columnCount);
} else if (!style()->hasAutoColumnWidth() && style()->hasAutoColumnCount()) {
m_columnCount = max<LayoutUnit>(1, (availWidth + colGap) / (colWidth + colGap));
m_columnWidth = ((availWidth + colGap) / m_columnCount) - colGap;
} else {
m_columnCount = max<LayoutUnit>(min<LayoutUnit>(colCount, (availWidth + colGap) / (colWidth + colGap)), 1);
m_columnWidth = ((availWidth + colGap) / m_columnCount) - colGap;
}
}
bool RenderMultiColumnBlock::recomputeLogicalWidth()
{
bool relayoutChildren = RenderBlock::recomputeLogicalWidth();
LayoutUnit oldColumnWidth = m_columnWidth;
computeColumnCountAndWidth();
if (m_columnWidth != oldColumnWidth)
relayoutChildren = true;
return relayoutChildren;
}
const char* RenderMultiColumnBlock::renderName() const
{
if (isFloating())
return "RenderMultiColumnBlock (floating)";
if (isPositioned())
return "RenderMultiColumnBlock (positioned)";
if (isAnonymousBlock())
return "RenderMultiColumnBlock (anonymous)";
if (isAnonymous())
return "RenderMultiColumnBlock (generated)";
if (isRelPositioned())
return "RenderMultiColumnBlock (relative positioned)";
return "RenderMultiColumnBlock";
}
}