зеркало из https://github.com/mozilla/gecko-dev.git
48 строки
1.6 KiB
C++
48 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* A namespace class for static muti-column utilities. */
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#include "mozilla/ColumnUtils.h"
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#include <algorithm>
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#include "nsContainerFrame.h"
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#include "nsLayoutUtils.h"
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namespace mozilla {
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/* static */
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nscoord ColumnUtils::GetColumnGap(const nsContainerFrame* aFrame,
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nscoord aPercentageBasis) {
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const auto& columnGap = aFrame->StylePosition()->mColumnGap;
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if (columnGap.IsNormal()) {
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return aFrame->StyleFont()->mFont.size.ToAppUnits();
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}
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return nsLayoutUtils::ResolveGapToLength(columnGap, aPercentageBasis);
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}
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/* static */
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nscoord ColumnUtils::ClampUsedColumnWidth(const Length& aColumnWidth) {
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// Per spec, used values will be clamped to a minimum of 1px.
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return std::max(CSSPixel::ToAppUnits(1), aColumnWidth.ToAppUnits());
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}
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/* static */
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nscoord ColumnUtils::IntrinsicISize(uint32_t aColCount, nscoord aColGap,
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nscoord aColISize) {
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MOZ_ASSERT(aColCount > 0, "Cannot compute with zero columns!");
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// Column box's inline-size times number of columns (n), plus n-1 column gaps.
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nscoord iSize = aColISize * aColCount + aColGap * (aColCount - 1);
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// The multiplication above can make 'iSize' negative (integer overflow),
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// so use std::max to protect against that.
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return std::max(iSize, aColISize);
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}
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} // namespace mozilla
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