gecko-dev/dom/grid/GridLines.cpp

127 строки
3.3 KiB
C++
Исходник Обычный вид История

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "GridLines.h"
#include "GridDimension.h"
#include "GridLine.h"
#include "mozilla/dom/GridBinding.h"
#include "nsGridContainerFrame.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(GridLines, mParent, mLines)
NS_IMPL_CYCLE_COLLECTING_ADDREF(GridLines)
NS_IMPL_CYCLE_COLLECTING_RELEASE(GridLines)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(GridLines)
NS_WRAPPERCACHE_INTERFACE_MAP_ENTRY
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
GridLines::GridLines(GridDimension* aParent)
: mParent(aParent)
{
MOZ_ASSERT(aParent,
"Should never be instantiated with a null GridDimension");
}
GridLines::~GridLines()
{
}
JSObject*
GridLines::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return GridLinesBinding::Wrap(aCx, this, aGivenProto);
}
uint32_t
GridLines::Length() const
{
return mLines.Length();
}
GridLine*
GridLines::Item(uint32_t aIndex)
{
return mLines.SafeElementAt(aIndex);
}
GridLine*
GridLines::IndexedGetter(uint32_t aIndex,
bool& aFound)
{
aFound = aIndex < mLines.Length();
if (!aFound) {
return nullptr;
}
return mLines[aIndex];
}
void
GridLines::SetLineInfo(const ComputedGridTrackInfo* aTrackInfo,
const ComputedGridLineInfo* aLineInfo)
{
mLines.Clear();
if (!aTrackInfo) {
return;
}
uint32_t trackCount = aTrackInfo->mEndFragmentTrack -
aTrackInfo->mStartFragmentTrack;
// If there is at least one track, line count is one more
// than the number of tracks.
if (trackCount > 0) {
double endOfLastTrack = 0.0;
double startOfNextTrack;
for (uint32_t i = aTrackInfo->mStartFragmentTrack;
i < aTrackInfo->mEndFragmentTrack + 1;
i++) {
startOfNextTrack = (i < aTrackInfo->mEndFragmentTrack) ?
aTrackInfo->mPositions[i] :
endOfLastTrack;
GridLine* line = new GridLine(this);
mLines.AppendElement(line);
nsTArray<nsString> lineNames;
if (aLineInfo) {
lineNames = aLineInfo->mNames.SafeElementAt(i, nsTArray<nsString>());
}
line->SetLineValues(
lineNames,
nsPresContext::AppUnitsToDoubleCSSPixels(endOfLastTrack),
nsPresContext::AppUnitsToDoubleCSSPixels(startOfNextTrack -
endOfLastTrack),
i + 1,
(
// Implicit if there are no explicit tracks, or if the index
// is before the first explicit track, or after
// a track beyond the last explicit track.
(aTrackInfo->mNumExplicitTracks == 0) ||
(i < aTrackInfo->mNumLeadingImplicitTracks) ||
(i > aTrackInfo->mNumLeadingImplicitTracks +
aTrackInfo->mNumExplicitTracks) ?
GridDeclaration::Implicit :
GridDeclaration::Explicit
)
);
if (i < aTrackInfo->mEndFragmentTrack) {
endOfLastTrack = aTrackInfo->mPositions[i] + aTrackInfo->mSizes[i];
}
}
}
}
} // namespace dom
} // namespace mozilla