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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* This Source Code is subject to the terms of the Mozilla Public License
* version 2.0 (the "License"). You can obtain a copy of the License at
* http://mozilla.org/MPL/2.0/. */
/* rendering object for CSS "display: grid | inline-grid" */
#include "nsGridContainerFrame.h"
#include "nsCSSAnonBoxes.h"
#include "nsPresContext.h"
#include "nsReadableUtils.h"
#include "nsStyleContext.h"
using namespace mozilla;
// Return true if aString ends in aSuffix and has at least one character before
// the suffix. Assign aIndex to where the suffix starts.
static bool
IsNameWithSuffix(const nsString& aString, const nsString& aSuffix,
uint32_t* aIndex)
{
if (StringEndsWith(aString, aSuffix)) {
*aIndex = aString.Length() - aSuffix.Length();
return *aIndex != 0;
}
return false;
}
static bool
IsNameWithEndSuffix(const nsString& aString, uint32_t* aIndex)
{
return IsNameWithSuffix(aString, NS_LITERAL_STRING("-end"), aIndex);
}
static bool
IsNameWithStartSuffix(const nsString& aString, uint32_t* aIndex)
{
return IsNameWithSuffix(aString, NS_LITERAL_STRING("-start"), aIndex);
}
//----------------------------------------------------------------------
// Frame class boilerplate
// =======================
NS_QUERYFRAME_HEAD(nsGridContainerFrame)
NS_QUERYFRAME_ENTRY(nsGridContainerFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
NS_IMPL_FRAMEARENA_HELPERS(nsGridContainerFrame)
nsContainerFrame*
NS_NewGridContainerFrame(nsIPresShell* aPresShell,
nsStyleContext* aContext)
{
return new (aPresShell) nsGridContainerFrame(aContext);
}
//----------------------------------------------------------------------
// nsGridContainerFrame Method Implementations
// ===========================================
void
nsGridContainerFrame::AddImplicitNamedAreas(
const nsTArray<nsTArray<nsString>>& aLineNameLists)
{
// http://dev.w3.org/csswg/css-grid/#implicit-named-areas
// XXX this just checks x-start .. x-end in one dimension and there's
// no other error checking. A few wrong cases (maybe):
// (x-start x-end)
// (x-start) 0 (x-start) 0 (x-end)
// (x-end) 0 (x-start) 0 (x-end)
// (x-start) 0 (x-end) 0 (x-start) 0 (x-end)
const uint32_t len = aLineNameLists.Length();
nsTHashtable<nsStringHashKey> currentStarts;
ImplicitNamedAreas* areas = GetImplicitNamedAreas();
for (uint32_t i = 0; i < len; ++i) {
const nsTArray<nsString>& names(aLineNameLists[i]);
const uint32_t jLen = names.Length();
for (uint32_t j = 0; j < jLen; ++j) {
const nsString& name = names[j];
uint32_t index;
if (::IsNameWithStartSuffix(name, &index)) {
currentStarts.PutEntry(nsDependentSubstring(name, 0, index));
} else if (::IsNameWithEndSuffix(name, &index)) {
nsDependentSubstring area(name, 0, index);
if (currentStarts.Contains(area)) {
if (!areas) {
areas = new ImplicitNamedAreas;
Properties().Set(ImplicitNamedAreasProperty(), areas);
}
areas->PutEntry(area);
}
}
}
}
}
void
nsGridContainerFrame::InitImplicitNamedAreas(const nsStylePosition* aStyle)
{
ImplicitNamedAreas* areas = GetImplicitNamedAreas();
if (areas) {
// Clear it, but reuse the hashtable itself for now. We'll remove it
// below if it isn't needed anymore.
areas->Clear();
}
AddImplicitNamedAreas(aStyle->mGridTemplateColumns.mLineNameLists);
AddImplicitNamedAreas(aStyle->mGridTemplateRows.mLineNameLists);
if (areas && areas->Count() == 0) {
Properties().Delete(ImplicitNamedAreasProperty());
}
}
void
nsGridContainerFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsGridContainerFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, aDesiredSize, aStatus);
if (IsFrameTreeTooDeep(aReflowState, aDesiredSize, aStatus)) {
return;
}
#ifdef DEBUG
SanityCheckAnonymousGridItems();
#endif // DEBUG
LogicalMargin bp = aReflowState.ComputedLogicalBorderPadding();
bp.ApplySkipSides(GetLogicalSkipSides());
nscoord contentBSize = GetEffectiveComputedBSize(aReflowState);
if (contentBSize == NS_AUTOHEIGHT) {
contentBSize = 0;
}
WritingMode wm = aReflowState.GetWritingMode();
LogicalSize finalSize(wm,
aReflowState.ComputedISize() + bp.IStartEnd(wm),
contentBSize + bp.BStartEnd(wm));
aDesiredSize.SetSize(wm, finalSize);
aDesiredSize.SetOverflowAreasToDesiredBounds();
const nsStylePosition* stylePos = aReflowState.mStylePosition;
InitImplicitNamedAreas(stylePos);
aStatus = NS_FRAME_COMPLETE;
NS_FRAME_SET_TRUNCATION(aStatus, aReflowState, aDesiredSize);
}
nsIAtom*
nsGridContainerFrame::GetType() const
{
return nsGkAtoms::gridContainerFrame;
}
#ifdef DEBUG_FRAME_DUMP
nsresult
nsGridContainerFrame::GetFrameName(nsAString& aResult) const
{
return MakeFrameName(NS_LITERAL_STRING("GridContainer"), aResult);
}
#endif
#ifdef DEBUG
static bool
FrameWantsToBeInAnonymousGridItem(nsIFrame* aFrame)
{
// Note: This needs to match the logic in
// nsCSSFrameConstructor::FrameConstructionItem::NeedsAnonFlexOrGridItem()
return (aFrame->IsFrameOfType(nsIFrame::eLineParticipant) ||
nsGkAtoms::placeholderFrame == aFrame->GetType());
}
// Debugging method, to let us assert that our anonymous grid items are
// set up correctly -- in particular, we assert:
// (1) we don't have any inline non-replaced children
// (2) we don't have any consecutive anonymous grid items
// (3) we don't have any empty anonymous grid items
// (4) all children are on the expected child lists
void
nsGridContainerFrame::SanityCheckAnonymousGridItems() const
{
// XXX handle kOverflowContainersList / kExcessOverflowContainersList
// when we implement fragmentation?
ChildListIDs noCheckLists = kAbsoluteList | kFixedList;
ChildListIDs checkLists = kPrincipalList | kOverflowList;
for (nsIFrame::ChildListIterator childLists(this);
!childLists.IsDone(); childLists.Next()) {
if (!checkLists.Contains(childLists.CurrentID())) {
MOZ_ASSERT(noCheckLists.Contains(childLists.CurrentID()),
"unexpected non-empty child list");
continue;
}
bool prevChildWasAnonGridItem = false;
nsFrameList children = childLists.CurrentList();
for (nsFrameList::Enumerator e(children); !e.AtEnd(); e.Next()) {
nsIFrame* child = e.get();
MOZ_ASSERT(!FrameWantsToBeInAnonymousGridItem(child),
"frame wants to be inside an anonymous grid item, "
"but it isn't");
if (child->StyleContext()->GetPseudo() ==
nsCSSAnonBoxes::anonymousGridItem) {
/*
XXX haven't decided yet whether to reorder children or not.
XXX If we do, we want this assertion instead of the one below.
MOZ_ASSERT(!prevChildWasAnonGridItem ||
HasAnyStateBits(NS_STATE_GRID_CHILDREN_REORDERED),
"two anon grid items in a row (shouldn't happen, unless our "
"children have been reordered with the 'order' property)");
*/
MOZ_ASSERT(!prevChildWasAnonGridItem, "two anon grid items in a row");
nsIFrame* firstWrappedChild = child->GetFirstPrincipalChild();
MOZ_ASSERT(firstWrappedChild,
"anonymous grid item is empty (shouldn't happen)");
prevChildWasAnonGridItem = true;
} else {
prevChildWasAnonGridItem = false;
}
}
}
}
#endif // DEBUG
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