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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "core/layout/LayoutPagedFlowThread.h"
#include "core/layout/LayoutMultiColumnSet.h"
namespace blink {
LayoutPagedFlowThread* LayoutPagedFlowThread::createAnonymous(Document& document, const ComputedStyle& parentStyle)
{
LayoutPagedFlowThread* pagedFlowThread = new LayoutPagedFlowThread();
pagedFlowThread->setDocumentForAnonymous(&document);
pagedFlowThread->setStyle(ComputedStyle::createAnonymousStyleWithDisplay(parentStyle, BLOCK));
return pagedFlowThread;
}
int LayoutPagedFlowThread::pageCount()
{
if (LayoutMultiColumnSet* columnSet = firstMultiColumnSet())
return columnSet->actualColumnCount();
return 1;
}
bool LayoutPagedFlowThread::needsNewWidth() const
{
return progressionIsInline() != pagedBlockFlow()->style()->hasInlinePaginationAxis();
}
void LayoutPagedFlowThread::updateLogicalWidth()
{
// As long as we inherit from LayoutMultiColumnFlowThread, we need to bypass its implementation
// here. We're not split into columns, so the flow thread width will just be whatever is
// available in the containing block.
LayoutFlowThread::updateLogicalWidth();
}
void LayoutPagedFlowThread::layout()
{
ASSERT(firstMultiColumnBox() == lastMultiColumnBox()); // There should either be zero or one of those for paged layout.
setProgressionIsInline(pagedBlockFlow()->style()->hasInlinePaginationAxis());
LayoutMultiColumnFlowThread::layout();
LayoutMultiColumnSet* columnSet = firstMultiColumnSet();
if (!columnSet)
return;
LayoutUnit pageLogicalHeight = columnSet->pageLogicalHeightForOffset(LayoutUnit());
if (!pageLogicalHeight)
return; // Page height not calculated yet. Happens in the first layout pass when height is auto.
// Ensure uniform page height. We don't want the last page to be shorter than the others,
// or it'll be impossible to scroll that whole page into view.
LayoutUnit paddedLogicalBottomInFlowThread = pageLogicalHeight * pageCount();
ASSERT(paddedLogicalBottomInFlowThread >= columnSet->logicalBottomInFlowThread());
columnSet->endFlow(paddedLogicalBottomInFlowThread);
}
} // namespace blink
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