diff options
Diffstat (limited to '')
| -rw-r--r-- | accessible/mac/MOXAccessibleBase.mm | 584 |
1 files changed, 584 insertions, 0 deletions
diff --git a/accessible/mac/MOXAccessibleBase.mm b/accessible/mac/MOXAccessibleBase.mm new file mode 100644 index 0000000000..fe7c367f8c --- /dev/null +++ b/accessible/mac/MOXAccessibleBase.mm @@ -0,0 +1,584 @@ +/* clang-format off */ +/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* clang-format on */ +/* 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/. */ + +#import "MOXAccessibleBase.h" + +#import "MacSelectorMap.h" + +#include "nsObjCExceptions.h" +#include "xpcAccessibleMacInterface.h" +#include "mozilla/Logging.h" +#include "gfxPlatform.h" + +using namespace mozilla; +using namespace mozilla::a11y; + +#undef LOG +mozilla::LogModule* GetMacAccessibilityLog() { + static mozilla::LazyLogModule sLog("MacAccessibility"); + + return sLog; +} +#define LOG(type, format, ...) \ + do { \ + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), type)) { \ + NSString* msg = [NSString stringWithFormat:(format), ##__VA_ARGS__]; \ + MOZ_LOG(GetMacAccessibilityLog(), type, ("%s", [msg UTF8String])); \ + } \ + } while (0) + +@interface NSObject (MOXAccessible) + +// This NSObject conforms to MOXAccessible. +// This is needed to we know to mutate the value +// (get represented view, check isAccessibilityElement) +// before forwarding it to NSAccessibility. +- (BOOL)isMOXAccessible; + +// Same as above, but this checks if the NSObject is an array with +// mozAccessible conforming objects. +- (BOOL)hasMOXAccessibles; + +@end + +@implementation NSObject (MOXAccessible) + +- (BOOL)isMOXAccessible { + return [self conformsToProtocol:@protocol(MOXAccessible)]; +} + +- (BOOL)hasMOXAccessibles { + return [self isKindOfClass:[NSArray class]] && + [[(NSArray*)self firstObject] isMOXAccessible]; +} + +@end + +// Private methods +@interface MOXAccessibleBase () + +- (BOOL)isSelectorSupported:(SEL)selector; + +@end + +@implementation MOXAccessibleBase + +#pragma mark - mozAccessible/widget + +- (BOOL)hasRepresentedView { + return NO; +} + +- (id)representedView { + return nil; +} + +- (BOOL)isRoot { + return NO; +} + +#pragma mark - mozAccessible/NSAccessibility + +- (NSArray*)accessibilityAttributeNames { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return nil; + } + + static NSMutableDictionary* attributesForEachClass = nil; + + if (!attributesForEachClass) { + attributesForEachClass = [[NSMutableDictionary alloc] init]; + } + + NSMutableArray* attributes = + attributesForEachClass [[self class]] + ?: [[[NSMutableArray alloc] init] autorelease]; + + NSDictionary* getters = mac::AttributeGetters(); + if (![attributes count]) { + // Go through all our attribute getters, if they are supported by this class + // advertise the attribute name. + for (NSString* attribute in getters) { + SEL selector = NSSelectorFromString(getters[attribute]); + if ([self isSelectorSupported:selector]) { + [attributes addObject:attribute]; + } + } + + // If we have a delegate add all the text marker attributes. + if ([self moxTextMarkerDelegate]) { + [attributes addObjectsFromArray:[mac::TextAttributeGetters() allKeys]]; + } + + // We store a hash table with types as keys, and atttribute lists as values. + // This lets us cache the atttribute list of each subclass so we only + // need to gather its MOXAccessible methods once. + // XXX: Uncomment when accessibilityAttributeNames is removed from all + // subclasses. attributesForEachClass[[self class]] = attributes; + } + + return attributes; + + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (id)accessibilityAttributeValue:(NSString*)attribute { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + if ([self isExpired]) { + return nil; + } + + id value = nil; + NSDictionary* getters = mac::AttributeGetters(); + if (getters[attribute]) { + SEL selector = NSSelectorFromString(getters[attribute]); + if ([self isSelectorSupported:selector]) { + value = [self performSelector:selector]; + } + } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) { + // If we have a delegate, check if attribute is a text marker + // attribute and call the associated selector on the delegate + // if so. + NSDictionary* textMarkerGetters = mac::TextAttributeGetters(); + if (textMarkerGetters[attribute]) { + SEL selector = NSSelectorFromString(textMarkerGetters[attribute]); + if ([textMarkerDelegate respondsToSelector:selector]) { + value = [textMarkerDelegate performSelector:selector]; + } + } + } + + if ([value isMOXAccessible]) { + // If this is a MOXAccessible, get its represented view or filter it if + // it should be ignored. + value = [value isAccessibilityElement] ? GetObjectOrRepresentedView(value) + : nil; + } + + if ([value hasMOXAccessibles]) { + // If this is an array of mozAccessibles, get each element's represented + // view and remove it from the returned array if it should be ignored. + NSUInteger arrSize = [value count]; + NSMutableArray* arr = + [[[NSMutableArray alloc] initWithCapacity:arrSize] autorelease]; + for (NSUInteger i = 0; i < arrSize; i++) { + id<mozAccessible> mozAcc = GetObjectOrRepresentedView(value[i]); + if ([mozAcc isAccessibilityElement]) { + [arr addObject:mozAcc]; + } + } + + value = arr; + } + + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Debug)) { + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) { + LOG(LogLevel::Verbose, @"%@ attributeValue %@ => %@", self, attribute, + value); + } else if (![attribute isEqualToString:@"AXParent"] && + ![attribute isEqualToString:@"AXRole"] && + ![attribute isEqualToString:@"AXSubrole"] && + ![attribute isEqualToString:@"AXSize"] && + ![attribute isEqualToString:@"AXPosition"] && + ![attribute isEqualToString:@"AXRole"] && + ![attribute isEqualToString:@"AXChildren"]) { + LOG(LogLevel::Debug, @"%@ attributeValue %@", self, attribute); + } + } + + return value; + + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (BOOL)accessibilityIsAttributeSettable:(NSString*)attribute { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return NO; + } + + NSDictionary* setters = mac::AttributeSetters(); + if (setters[attribute]) { + SEL selector = NSSelectorFromString(setters[attribute]); + if ([self isSelectorSupported:selector]) { + return YES; + } + } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) { + // If we have a delegate, check text setters on delegate + NSDictionary* textMarkerSetters = mac::TextAttributeSetters(); + if (textMarkerSetters[attribute]) { + SEL selector = NSSelectorFromString(textMarkerSetters[attribute]); + if ([textMarkerDelegate respondsToSelector:selector]) { + return YES; + } + } + } + + NS_OBJC_END_TRY_BLOCK_RETURN(NO); +} + +- (void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute { + NS_OBJC_BEGIN_TRY_IGNORE_BLOCK; + + if ([self isExpired]) { + return; + } + + LOG(LogLevel::Debug, @"%@ setValueForattribute %@ = %@", self, attribute, + value); + + NSDictionary* setters = mac::AttributeSetters(); + if (setters[attribute]) { + SEL selector = NSSelectorFromString(setters[attribute]); + if ([self isSelectorSupported:selector]) { + [self performSelector:selector withObject:value]; + } + } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) { + // If we have a delegate, check if attribute is a text marker + // attribute and call the associated selector on the delegate + // if so. + NSDictionary* textMarkerSetters = mac::TextAttributeSetters(); + if (textMarkerSetters[attribute]) { + SEL selector = NSSelectorFromString(textMarkerSetters[attribute]); + if ([textMarkerDelegate respondsToSelector:selector]) { + [textMarkerDelegate performSelector:selector withObject:value]; + } + } + } + + NS_OBJC_END_TRY_IGNORE_BLOCK; +} + +- (NSArray*)accessibilityActionNames { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return nil; + } + + NSMutableArray* actionNames = [[[NSMutableArray alloc] init] autorelease]; + + NSDictionary* actions = mac::Actions(); + for (NSString* action in actions) { + SEL selector = NSSelectorFromString(actions[action]); + if ([self isSelectorSupported:selector]) { + [actionNames addObject:action]; + } + } + + return actionNames; + + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (void)accessibilityPerformAction:(NSString*)action { + NS_OBJC_BEGIN_TRY_IGNORE_BLOCK; + + if ([self isExpired]) { + return; + } + + LOG(LogLevel::Debug, @"%@ performAction %@ ", self, action); + + NSDictionary* actions = mac::Actions(); + if (actions[action]) { + SEL selector = NSSelectorFromString(actions[action]); + if ([self isSelectorSupported:selector]) { + [self performSelector:selector]; + } + } + + NS_OBJC_END_TRY_IGNORE_BLOCK; +} + +- (NSString*)accessibilityActionDescription:(NSString*)action { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + // by default we return whatever the MacOS API know about. + // if you have custom actions, override. + return NSAccessibilityActionDescription(action); + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (NSArray*)accessibilityParameterizedAttributeNames { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return nil; + } + + NSMutableArray* attributeNames = [[[NSMutableArray alloc] init] autorelease]; + + NSDictionary* attributes = mac::ParameterizedAttributeGetters(); + for (NSString* attribute in attributes) { + SEL selector = NSSelectorFromString(attributes[attribute]); + if ([self isSelectorSupported:selector]) { + [attributeNames addObject:attribute]; + } + } + + // If we have a delegate add all the text marker attributes. + if ([self moxTextMarkerDelegate]) { + [attributeNames + addObjectsFromArray:[mac::ParameterizedTextAttributeGetters() allKeys]]; + } + + return attributeNames; + + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (id)accessibilityAttributeValue:(NSString*)attribute + forParameter:(id)parameter { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return nil; + } + + id value = nil; + + NSDictionary* getters = mac::ParameterizedAttributeGetters(); + if (getters[attribute]) { + SEL selector = NSSelectorFromString(getters[attribute]); + if ([self isSelectorSupported:selector]) { + value = [self performSelector:selector withObject:parameter]; + } + } else if (id textMarkerDelegate = [self moxTextMarkerDelegate]) { + // If we have a delegate, check if attribute is a text marker + // attribute and call the associated selector on the delegate + // if so. + NSDictionary* textMarkerGetters = mac::ParameterizedTextAttributeGetters(); + if (textMarkerGetters[attribute]) { + SEL selector = NSSelectorFromString(textMarkerGetters[attribute]); + if ([textMarkerDelegate respondsToSelector:selector]) { + value = [textMarkerDelegate performSelector:selector + withObject:parameter]; + } + } + } + + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) { + LOG(LogLevel::Verbose, @"%@ attributeValueForParam %@(%@) => %@", self, + attribute, parameter, value); + } else { + LOG(LogLevel::Debug, @"%@ attributeValueForParam %@", self, attribute); + } + + return value; + + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (id)accessibilityHitTest:(NSPoint)point { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + return GetObjectOrRepresentedView([self moxHitTest:point]); + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (id)accessibilityFocusedUIElement { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + return GetObjectOrRepresentedView([self moxFocusedUIElement]); + NS_OBJC_END_TRY_BLOCK_RETURN(nil); +} + +- (BOOL)isAccessibilityElement { + NS_OBJC_BEGIN_TRY_BLOCK_RETURN; + + if ([self isExpired]) { + return YES; + } + + id parent = [self moxParent]; + if (![parent isMOXAccessible]) { + return YES; + } + + return ![self moxIgnoreWithParent:parent]; + + NS_OBJC_END_TRY_BLOCK_RETURN(NO); +} + +- (BOOL)accessibilityNotifiesWhenDestroyed { + return YES; +} + +#pragma mark - MOXAccessible protocol + +- (NSNumber*)moxIndexForChildUIElement:(id)child { + return @([[self moxUnignoredChildren] indexOfObject:child]); +} + +- (id)moxTopLevelUIElement { + return [self moxWindow]; +} + +- (id)moxHitTest:(NSPoint)point { + return self; +} + +- (id)moxFocusedUIElement { + return self; +} + +- (void)moxPostNotification:(NSString*)notification { + [self moxPostNotification:notification withUserInfo:nil]; +} + +- (void)moxPostNotification:(NSString*)notification + withUserInfo:(NSDictionary*)userInfo { + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Verbose)) { + LOG(LogLevel::Verbose, @"%@ notify %@ %@", self, notification, userInfo); + } else { + LOG(LogLevel::Debug, @"%@ notify %@", self, notification); + } + + // This sends events via nsIObserverService to be consumed by our mochitests. + xpcAccessibleMacEvent::FireEvent(self, notification, userInfo); + + if (gfxPlatform::IsHeadless()) { + // Using a headless toolkit for tests and whatnot, posting accessibility + // notification won't work. + return; + } + + if (![self isAccessibilityElement]) { + // If this is an ignored object, don't expose it to system. + return; + } + + if (userInfo) { + NSAccessibilityPostNotificationWithUserInfo( + GetObjectOrRepresentedView(self), notification, userInfo); + } else { + NSAccessibilityPostNotification(GetObjectOrRepresentedView(self), + notification); + } +} + +- (BOOL)moxBlockSelector:(SEL)selector { + return NO; +} + +- (NSArray*)moxChildren { + return @[]; +} + +- (NSArray*)moxUnignoredChildren { + NSMutableArray* unignoredChildren = + [[[NSMutableArray alloc] init] autorelease]; + NSArray* allChildren = [self moxChildren]; + + for (MOXAccessibleBase* nativeChild in allChildren) { + if ([nativeChild moxIgnoreWithParent:self]) { + // If this child should be ignored get its unignored children. + // This will in turn recurse to any unignored descendants if the + // child is ignored. + [unignoredChildren + addObjectsFromArray:[nativeChild moxUnignoredChildren]]; + } else { + [unignoredChildren addObject:nativeChild]; + } + } + + return unignoredChildren; +} + +- (id<mozAccessible>)moxParent { + return nil; +} + +- (id<mozAccessible>)moxUnignoredParent { + id<mozAccessible> nativeParent = [self moxParent]; + if (!nativeParent) { + return nil; + } + + if (![nativeParent isAccessibilityElement]) { + if ([nativeParent conformsToProtocol:@protocol(MOXAccessible)] && + [nativeParent respondsToSelector:@selector(moxUnignoredParent)]) { + // Cast away the protocol so we can cast to another protocol. + id bareNativeParent = nativeParent; + id<MOXAccessible> moxNativeParent = bareNativeParent; + return [moxNativeParent moxUnignoredParent]; + } + } + + return GetObjectOrRepresentedView(nativeParent); +} + +- (BOOL)moxIgnoreWithParent:(MOXAccessibleBase*)parent { + return [parent moxIgnoreChild:self]; +} + +- (BOOL)moxIgnoreChild:(MOXAccessibleBase*)child { + return NO; +} + +- (id<MOXTextMarkerSupport>)moxTextMarkerDelegate { + return nil; +} + +- (BOOL)moxIsLiveRegion { + return NO; +} + +#pragma mark - + +// objc-style description (from NSObject); not to be confused with the +// accessible description above. +- (NSString*)description { + if (MOZ_LOG_TEST(GetMacAccessibilityLog(), LogLevel::Debug)) { + if ([self isSelectorSupported:@selector(moxMozDebugDescription)]) { + return [self moxMozDebugDescription]; + } + } + + return [NSString stringWithFormat:@"<%@: %p %@>", + NSStringFromClass([self class]), self, + [self moxRole]]; +} + +- (BOOL)isExpired { + return mIsExpired; +} + +- (void)expire { + MOZ_ASSERT(!mIsExpired, "expire called an expired mozAccessible!"); + + mIsExpired = YES; + + [self moxPostNotification:NSAccessibilityUIElementDestroyedNotification]; +} + +- (id<MOXAccessible>)moxFindAncestor:(BOOL (^)(id<MOXAccessible> moxAcc, + BOOL* stop))findBlock { + for (id element = self; [element conformsToProtocol:@protocol(MOXAccessible)]; + element = [element moxUnignoredParent]) { + BOOL stop = NO; + if (findBlock(element, &stop)) { + return element; + } + + if (stop || ![element respondsToSelector:@selector(moxUnignoredParent)]) { + break; + } + } + + return nil; +} + +#pragma mark - Private + +- (BOOL)isSelectorSupported:(SEL)selector { + return + [self respondsToSelector:selector] && ![self moxBlockSelector:selector]; +} + +@end |