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Issue #1641 - Implement CSS flow-root keyword

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This is just a clean port of 1322191 and follow-up 1325970. It really seems to add create a new way to access existing code relating to block formatting and floating elements rather than implementing new functionality, and it is mercifully straightforwards.
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athenian200 2020-09-03 18:55:28 -05:00 • committed by Roy Tam
commit 9532970df5
15 changed files with 68 additions and 16 deletions
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34
layout/base/nsLayoutUtils.cpp
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@ -149,6 +149,7 @@ using namespace mozilla::gfx;
#define GRID_ENABLED_PREF_NAME "layout.css.grid.enabled"
#define GRID_TEMPLATE_SUBGRID_ENABLED_PREF_NAME "layout.css.grid-template-subgrid-value.enabled"
#define WEBKIT_PREFIXES_ENABLED_PREF_NAME "layout.css.prefixes.webkit"
#define DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME "layout.css.display-flow-root.enabled"
#define DISPLAY_CONTENTS_ENABLED_PREF_NAME "layout.css.display-contents.enabled"
#define TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME "layout.css.text-align-unsafe-value.enabled"
#define FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME "layout.css.float-logical-values.enabled"
@ -314,6 +315,37 @@ WebkitPrefixEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
}
}
// When the pref "layout.css.display-flow-root.enabled" changes, this function is
// invoked to let us update kDisplayKTable, to selectively disable or restore
// the entries for "flow-root" in that table.
static void
DisplayFlowRootEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
NS_ASSERTION(strcmp(aPrefName, DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME) == 0,
"Did you misspell " DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME " ?");
static bool sIsDisplayFlowRootKeywordIndexInitialized;
static int32_t sIndexOfFlowRootInDisplayTable;
bool isDisplayFlowRootEnabled =
Preferences::GetBool(DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME, false);
if (!sIsDisplayFlowRootKeywordIndexInitialized) {
// First run: find the position of "flow-root" in kDisplayKTable.
sIndexOfFlowRootInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword_flow_root,
nsCSSProps::kDisplayKTable);
sIsDisplayFlowRootKeywordIndexInitialized = true;
}
// OK -- now, stomp on or restore the "flow-root" entry in kDisplayKTable,
// depending on whether the pref is enabled vs. disabled.
if (sIndexOfFlowRootInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfFlowRootInDisplayTable].mKeyword =
isDisplayFlowRootEnabled ? eCSSKeyword_flow_root : eCSSKeyword_UNKNOWN;
}
}
// When the pref "layout.css.display-contents.enabled" changes, this function is
// invoked to let us update kDisplayKTable, to selectively disable or restore
// the entries for "contents" in that table.
@ -7555,6 +7587,8 @@ static const PrefCallbacks kPrefCallbacks[] = {
WebkitPrefixEnabledPrefChangeCallback },
{ TEXT_ALIGN_UNSAFE_ENABLED_PREF_NAME,
TextAlignUnsafeEnabledPrefChangeCallback },
{ DISPLAY_FLOW_ROOT_ENABLED_PREF_NAME,
DisplayFlowRootEnabledPrefChangeCallback },
{ DISPLAY_CONTENTS_ENABLED_PREF_NAME,
DisplayContentsEnabledPrefChangeCallback },
{ FLOAT_LOGICAL_VALUES_ENABLED_PREF_NAME,