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Bug 796212 part 2: Make pref "layout.css.flexbox.enabled" control whether -moz-flex and -moz-inline-flex are recognized as valid values for "display" property. r=bz

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This commit is contained in:
Daniel Holbert 2012-10-02 22:04:50 -07:00
parent 03416aed4f
commit 1c3ec77888
3 changed files with 90 additions and 6 deletions
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64
layout/base/nsLayoutUtils.cpp
View File

@ -60,6 +60,7 @@
#include "imgIRequest.h"
#include "nsIImageLoadingContent.h"
#include "nsCOMPtr.h"
#include "nsCSSProps.h"
#include "nsListControlFrame.h"
#include "ImageLayers.h"
#include "mozilla/arm.h"
@ -92,6 +93,8 @@ using namespace mozilla::layers;
using namespace mozilla::dom;
using namespace mozilla::layout;
#define FLEXBOX_ENABLED_PREF_NAME "layout.css.flexbox.enabled"
#ifdef DEBUG
// TODO: remove, see bug 598468.
bool nsLayoutUtils::gPreventAssertInCompareTreePosition = false;
@ -107,6 +110,13 @@ typedef FrameMetrics::ViewID ViewID;
static ViewID sScrollIdCounter = FrameMetrics::START_SCROLL_ID;
// These are indices into kDisplayKTable. They'll be initialized
// the first time that FlexboxEnabledPrefChangeCallback() is invoked.
static int32_t sIndexOfFlexInDisplayTable;
static int32_t sIndexOfInlineFlexInDisplayTable;
// This tracks whether those ^^ indices have been initialized
static bool sAreFlexKeywordIndicesInitialized = false;
typedef nsDataHashtable<nsUint64HashKey, nsIContent*> ContentMap;
static ContentMap* sContentMap = nullptr;
static ContentMap& GetContentMap() {
@ -117,6 +127,49 @@ static ContentMap& GetContentMap() {
return *sContentMap;
}
// When the pref "layout.css.flexbox.enabled" changes, this function is invoked
// to let us update kDisplayKTable, to selectively disable or restore the
// entries for "-moz-flex" and "-moz-inline-flex" in that table.
#ifdef MOZ_FLEXBOX
static int
FlexboxEnabledPrefChangeCallback(const char* aPrefName, void* aClosure)
{
MOZ_ASSERT(strncmp(aPrefName, FLEXBOX_ENABLED_PREF_NAME,
NS_ARRAY_LENGTH(FLEXBOX_ENABLED_PREF_NAME)) == 0,
"We only registered this callback for a single pref, so it "
"should only be called for that pref");
bool isFlexboxEnabled =
Preferences::GetBool(FLEXBOX_ENABLED_PREF_NAME, false);
if (!sAreFlexKeywordIndicesInitialized) {
// First run: find the position of "-moz-flex" and "-moz-inline-flex" in
// kDisplayKTable.
sIndexOfFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__moz_flex,
nsCSSProps::kDisplayKTable);
sIndexOfInlineFlexInDisplayTable =
nsCSSProps::FindIndexOfKeyword(eCSSKeyword__moz_inline_flex,
nsCSSProps::kDisplayKTable);
sAreFlexKeywordIndicesInitialized = true;
}
// OK -- now, stomp on or restore the "flex" entries in kDisplayKTable,
// depending on whether the flexbox pref is enabled vs. disabled.
if (sIndexOfFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfFlexInDisplayTable] =
isFlexboxEnabled ? eCSSKeyword__moz_flex : eCSSKeyword_UNKNOWN;
}
if (sIndexOfInlineFlexInDisplayTable >= 0) {
nsCSSProps::kDisplayKTable[sIndexOfInlineFlexInDisplayTable] =
isFlexboxEnabled ? eCSSKeyword__moz_inline_flex : eCSSKeyword_UNKNOWN;
}
return 0;
}
#endif // MOZ_FLEXBOX
bool
nsLayoutUtils::HasAnimationsForCompositor(nsIContent* aContent,
nsCSSProperty aProperty)
@ -4580,6 +4633,12 @@ nsLayoutUtils::Initialize()
"font.size.inflation.lineThreshold");
Preferences::AddIntVarCache(&sFontSizeInflationMappingIntercept,
"font.size.inflation.mappingIntercept");
#ifdef MOZ_FLEXBOX
Preferences::RegisterCallback(FlexboxEnabledPrefChangeCallback,
FLEXBOX_ENABLED_PREF_NAME);
FlexboxEnabledPrefChangeCallback(FLEXBOX_ENABLED_PREF_NAME, nullptr);
#endif // MOZ_FLEXBOX
}
/* static */
@ -4590,6 +4649,11 @@ nsLayoutUtils::Shutdown()
delete sContentMap;
sContentMap = nullptr;
}
#ifdef MOZ_FLEXBOX
Preferences::UnregisterCallback(FlexboxEnabledPrefChangeCallback,
FLEXBOX_ENABLED_PREF_NAME);
#endif // MOZ_FLEXBOX
}
/* static */

24
layout/style/nsCSSProps.cpp
View File

@ -920,7 +920,7 @@ const int32_t nsCSSProps::kDirectionKTable[] = {
eCSSKeyword_UNKNOWN,-1
};
const int32_t nsCSSProps::kDisplayKTable[] = {
int32_t nsCSSProps::kDisplayKTable[] = {
eCSSKeyword_none, NS_STYLE_DISPLAY_NONE,
eCSSKeyword_inline, NS_STYLE_DISPLAY_INLINE,
eCSSKeyword_block, NS_STYLE_DISPLAY_BLOCK,
@ -952,6 +952,9 @@ const int32_t nsCSSProps::kDisplayKTable[] = {
eCSSKeyword__moz_groupbox, NS_STYLE_DISPLAY_GROUPBOX,
#endif
#ifdef MOZ_FLEXBOX
// XXXdholbert NOTE: These currently need to be the last entries in the
// table, because the "is flexbox enabled" pref that disables these will
// disable all the entries after them, too.
eCSSKeyword__moz_flex, NS_STYLE_DISPLAY_FLEX,
eCSSKeyword__moz_inline_flex, NS_STYLE_DISPLAY_INLINE_FLEX,
#endif // MOZ_FLEXBOX
@ -1639,17 +1642,28 @@ const int32_t nsCSSProps::kColumnFillKTable[] = {
eCSSKeyword_UNKNOWN, -1
};
bool
nsCSSProps::FindKeyword(nsCSSKeyword aKeyword, const int32_t aTable[], int32_t& aResult)
int32_t
nsCSSProps::FindIndexOfKeyword(nsCSSKeyword aKeyword, const int32_t aTable[])
{
int32_t index = 0;
while (eCSSKeyword_UNKNOWN != nsCSSKeyword(aTable[index])) {
if (aKeyword == nsCSSKeyword(aTable[index])) {
aResult = aTable[index+1];
return true;
return index;
}
index += 2;
}
return -1;
}
bool
nsCSSProps::FindKeyword(nsCSSKeyword aKeyword, const int32_t aTable[],
int32_t& aResult)
{
int32_t index = FindIndexOfKeyword(aKeyword, aTable);
if (index >= 0) {
aResult = aTable[index + 1];
return true;
}
return false;
}

8
layout/style/nsCSSProps.h
View File

@ -194,6 +194,11 @@ public:
// Sets the aStr param to the name of the propertyID
static bool GetColorName(int32_t aPropID, nsCString &aStr);
// Returns the index of |aKeyword| in |aTable|, if it exists there;
// otherwise, returns -1.
// NOTE: Generally, clients should call FindKeyword() instead of this method.
static int32_t FindIndexOfKeyword(nsCSSKeyword aKeyword, const int32_t aTable[]);
// Find |aKeyword| in |aTable|, if found set |aValue| to its corresponding value.
// If not found, return false and do not set |aValue|.
static bool FindKeyword(nsCSSKeyword aKeyword, const int32_t aTable[], int32_t& aValue);
@ -373,7 +378,8 @@ public:
static const int32_t kContentKTable[];
static const int32_t kCursorKTable[];
static const int32_t kDirectionKTable[];
static const int32_t kDisplayKTable[];
// Not const because we modify its entries when CSS prefs change.
static int32_t kDisplayKTable[];
static const int32_t kElevationKTable[];
static const int32_t kEmptyCellsKTable[];
#ifdef MOZ_FLEXBOX