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/*
* Copyright (C) 2012 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "RenderMultiColumnBlock.h"
#include "RenderMultiColumnFlowThread.h"
#include "RenderMultiColumnSet.h"
#include "StyleInheritedData.h"
using namespace std;
namespace WebCore {
RenderMultiColumnBlock::RenderMultiColumnBlock(Node* node)
: RenderBlock(node)
, m_flowThread(0)
, m_columnCount(1)
, m_columnWidth(0)
, m_columnHeight(0)
{
}
void RenderMultiColumnBlock::computeColumnCountAndWidth()
{
// Calculate our column width and column count.
// FIXME: Can overflow on fast/block/float/float-not-removed-from-next-sibling4.html, see https://bugs.webkit.org/show_bug.cgi?id=68744
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::updateLogicalWidthAndColumnWidth()
{
bool relayoutChildren = RenderBlock::updateLogicalWidthAndColumnWidth();
LayoutUnit oldColumnWidth = m_columnWidth;
computeColumnCountAndWidth();
if (m_columnWidth != oldColumnWidth)
relayoutChildren = true;
return relayoutChildren;
}
void RenderMultiColumnBlock::checkForPaginationLogicalHeightChange(LayoutUnit& /*pageLogicalHeight*/, bool& /*pageLogicalHeightChanged*/, bool& /*hasSpecifiedPageLogicalHeight*/)
{
// We don't actually update any of the variables. We just subclassed to adjust our column height.
updateLogicalHeight();
LayoutUnit newContentLogicalHeight = contentLogicalHeight();
if (newContentLogicalHeight > 0) {
// The regions will be invalidated when we lay them out and they change size to
// the new column height.
if (columnHeight() != newContentLogicalHeight)
setColumnHeight(newContentLogicalHeight);
}
setLogicalHeight(0);
// Set up our column sets.
ensureColumnSets();
}
bool RenderMultiColumnBlock::relayoutForPagination(bool, LayoutUnit, LayoutStateMaintainer&)
{
// FIXME: Implement.
return false;
}
void RenderMultiColumnBlock::addChild(RenderObject* newChild, RenderObject* beforeChild)
{
if (!m_flowThread) {
m_flowThread = new (renderArena()) RenderMultiColumnFlowThread(document());
m_flowThread->setStyle(RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK));
RenderBlock::addChild(m_flowThread); // Always put the flow thread at the end.
}
// Column sets are siblings of the flow thread. All children designed to be in the columns, however, are part
// of the flow thread itself.
if (newChild->isRenderMultiColumnSet())
RenderBlock::addChild(newChild, beforeChild);
else
m_flowThread->addChild(newChild, beforeChild);
}
void RenderMultiColumnBlock::ensureColumnSets()
{
// This function ensures we have the correct column set information before we get into layout.
// For a simple multi-column layout in continuous media, only one column set child is required.
// Once a column is nested inside an enclosing pagination context, the number of column sets
// required becomes 2n-1, where n is the total number of nested pagination contexts. For example:
//
// Column layout with no enclosing pagination model = 2 * 1 - 1 = 1 column set.
// Columns inside pages = 2 * 2 - 1 = 3 column sets (bottom of first page, all the subsequent pages, then the last page).
// Columns inside columns inside pages = 2 * 3 - 1 = 5 column sets.
//
// In addition, column spans will force a column set to "split" into before/after sets around the spanning region.
//
// Finally, we will need to deal with columns inside regions. If regions have variable widths, then there will need
// to be unique column sets created inside any region whose width is different from its surrounding regions. This is
// actually pretty similar to the spanning case, in that we break up the column sets whenever the width varies.
//
// FIXME: For now just make one column set. This matches the old multi-column code.
// Right now our goal is just feature parity with the old multi-column code so that we can switch over to the
// new code as soon as possible.
if (flowThread() && !firstChild()->isRenderMultiColumnSet()) {
RenderMultiColumnSet* columnSet = new (renderArena()) RenderMultiColumnSet(document(), flowThread());
columnSet->setStyle(RenderStyle::createAnonymousStyleWithDisplay(style(), BLOCK));
RenderBlock::addChild(columnSet, firstChild());
}
}
const char* RenderMultiColumnBlock::renderName() const
{
if (isFloating())
return "RenderMultiColumnBlock (floating)";
if (isOutOfFlowPositioned())
return "RenderMultiColumnBlock (positioned)";
if (isAnonymousBlock())
return "RenderMultiColumnBlock (anonymous)";
if (isAnonymous())
return "RenderMultiColumnBlock (generated)";
if (isRelPositioned())
return "RenderMultiColumnBlock (relative positioned)";
return "RenderMultiColumnBlock";
}
}
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