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/*
* Copyright (C) 2025 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. AND ITS CONTRIBUTORS ``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 INC. OR ITS 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 "TrackSizingAlgorithm.h"
#include "NotImplemented.h"
#include "TrackSizingFunctions.h"
#include <wtf/Vector.h>
namespace WebCore {
namespace Layout {
struct UnsizedTrack {
LayoutUnit baseSize;
LayoutUnit growthLimit;
const TrackSizingFunctions trackSizingFunction;
};
// https://drafts.csswg.org/css-grid-1/#algo-track-sizing
TrackSizes TrackSizingAlgorithm::sizeTracks(const PlacedGridItems&, const TrackSizingFunctionsList& trackSizingFunctions)
{
// 1. Initialize Track Sizes
auto unsizedTracks = initializeTrackSizes(trackSizingFunctions);
// 2. Resolve Intrinsic Track Sizes
auto resolveIntrinsicTrackSizes = [] {
notImplemented();
};
UNUSED_VARIABLE(resolveIntrinsicTrackSizes);
// 3. Maximize Tracks
auto maximizeTracks = [] {
notImplemented();
};
UNUSED_VARIABLE(maximizeTracks);
// 4. Expand Flexible Tracks
auto expandFlexibleTracks = [] {
notImplemented();
};
UNUSED_VARIABLE(expandFlexibleTracks);
// 5. Expand Stretched auto Tracks
auto expandStretchedAutoTracks = [] {
notImplemented();
};
UNUSED_VARIABLE(expandStretchedAutoTracks);
// Each track has a base size, a <length> which grows throughout the algorithm and
// which will eventually be the track’s final size...
return unsizedTracks.map([](const UnsizedTrack& unsizedTrack) {
return unsizedTrack.baseSize;
});
}
// https://www.w3.org/TR/css-grid-1/#algo-init
UnsizedTracks TrackSizingAlgorithm::initializeTrackSizes(const TrackSizingFunctionsList& trackSizingFunctionsList)
{
return trackSizingFunctionsList.map([](const TrackSizingFunctions& trackSizingFunctions) -> UnsizedTrack {
// For each track, if the track’s min track sizing function is:
auto baseSize = [&] -> LayoutUnit {
auto& minTrackSizingFunction = trackSizingFunctions.min;
// A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial base size.
if (minTrackSizingFunction.isLength()) {
auto& trackBreadthLength = minTrackSizingFunction.length();
if (auto fixedValue = trackBreadthLength.tryFixed())
return LayoutUnit { fixedValue->resolveZoom(Style::ZoomNeeded { }) };
if (auto percentValue = trackBreadthLength.tryPercentage()) {
ASSERT_NOT_IMPLEMENTED_YET();
return { };
}
}
// An intrinsic sizing function
// Use an initial base size of zero.
if (minTrackSizingFunction.isContentSized())
return { };
ASSERT_NOT_REACHED();
return { };
};
// For each track, if the track’s max track sizing function is:
auto growthLimit = [&] -> LayoutUnit {
auto& maxTrackSizingFunction = trackSizingFunctions.max;
// A fixed sizing function
// Resolve to an absolute length and use that size as the track’s initial growth limit.
if (maxTrackSizingFunction.isLength()) {
auto trackBreadthLength = maxTrackSizingFunction.length();
if (auto fixedValue = trackBreadthLength.tryFixed())
return LayoutUnit { fixedValue->resolveZoom(Style::ZoomNeeded { }) };
}
// An intrinsic sizing function
// A flexible sizing function
// Use an initial growth limit of infinity.
if (maxTrackSizingFunction.isContentSized() || maxTrackSizingFunction.isFlex())
return LayoutUnit::max();
ASSERT_NOT_REACHED();
return { };
};
return { baseSize(), growthLimit(), trackSizingFunctions };
});
}
} // namespace Layout
} // namespace WebCore
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