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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, EDisplay::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() {
// There should either be zero or one of those for paged layout.
DCHECK(firstMultiColumnBox() == lastMultiColumnBox());
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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