gecko/accessible/mac/mozTextAccessible.mm
2014-10-21 20:49:28 -04:00

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14 KiB
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/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "Accessible-inl.h"
#include "HyperTextAccessible-inl.h"
#include "TextLeafAccessible.h"
#include "nsCocoaUtils.h"
#include "nsObjCExceptions.h"
#import "mozTextAccessible.h"
using namespace mozilla::a11y;
inline bool
ToNSRange(id aValue, NSRange* aRange)
{
NS_PRECONDITION(aRange, "aRange is nil");
if ([aValue isKindOfClass:[NSValue class]] &&
strcmp([(NSValue*)aValue objCType], @encode(NSRange)) == 0) {
*aRange = [aValue rangeValue];
return true;
}
return false;
}
inline NSString*
ToNSString(id aValue)
{
if ([aValue isKindOfClass:[NSString class]]) {
return aValue;
}
return nil;
}
@interface mozTextAccessible ()
- (NSString*)subrole;
- (NSString*)selectedText;
- (NSValue*)selectedTextRange;
- (NSValue*)visibleCharacterRange;
- (long)textLength;
- (BOOL)isReadOnly;
- (NSNumber*)caretLineNumber;
- (void)setText:(NSString*)newText;
- (NSString*)text;
- (NSString*)stringFromRange:(NSRange*)range;
@end
@implementation mozTextAccessible
- (id)initWithAccessible:(AccessibleWrap*)accessible
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if ((self = [super initWithAccessible:accessible])) {
mGeckoTextAccessible = accessible->AsHyperText();
}
return self;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (BOOL)accessibilityIsIgnored
{
return !mGeckoAccessible;
}
- (NSArray*)accessibilityAttributeNames
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
static NSMutableArray* supportedAttributes = nil;
if (!supportedAttributes) {
// text-specific attributes to supplement the standard one
supportedAttributes = [[NSMutableArray alloc] initWithObjects:
NSAccessibilitySelectedTextAttribute, // required
NSAccessibilitySelectedTextRangeAttribute, // required
NSAccessibilityNumberOfCharactersAttribute, // required
NSAccessibilityVisibleCharacterRangeAttribute, // required
NSAccessibilityInsertionPointLineNumberAttribute,
@"AXRequired",
@"AXInvalid",
nil
];
[supportedAttributes addObjectsFromArray:[super accessibilityAttributeNames]];
}
return supportedAttributes;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (id)accessibilityAttributeValue:(NSString*)attribute
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if ([attribute isEqualToString:NSAccessibilityNumberOfCharactersAttribute])
return [NSNumber numberWithInt:[self textLength]];
if ([attribute isEqualToString:NSAccessibilityInsertionPointLineNumberAttribute])
return [self caretLineNumber];
if ([attribute isEqualToString:NSAccessibilitySelectedTextRangeAttribute])
return [self selectedTextRange];
if ([attribute isEqualToString:NSAccessibilitySelectedTextAttribute])
return [self selectedText];
if ([attribute isEqualToString:NSAccessibilityTitleAttribute])
return @"";
if ([attribute isEqualToString:NSAccessibilityValueAttribute]) {
// Apple's SpeechSynthesisServer expects AXValue to return an AXStaticText
// object's AXSelectedText attribute. See bug 674612 for details.
// Also if there is no selected text, we return the full text.
// See bug 369710 for details.
if ([[self role] isEqualToString:NSAccessibilityStaticTextRole]) {
NSString* selectedText = [self selectedText];
return (selectedText && [selectedText length]) ? selectedText : [self text];
}
return [self text];
}
if ([attribute isEqualToString:@"AXRequired"])
return [NSNumber numberWithBool:!!(mGeckoAccessible->State() & states::REQUIRED)];
if ([attribute isEqualToString:@"AXInvalid"])
return [NSNumber numberWithBool:!!(mGeckoAccessible->State() & states::INVALID)];
if ([attribute isEqualToString:NSAccessibilityVisibleCharacterRangeAttribute])
return [self visibleCharacterRange];
// let mozAccessible handle all other attributes
return [super accessibilityAttributeValue:attribute];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (NSArray*)accessibilityParameterizedAttributeNames
{
static NSArray* supportedParametrizedAttributes = nil;
// text specific parametrized attributes
if (!supportedParametrizedAttributes) {
supportedParametrizedAttributes = [[NSArray alloc] initWithObjects:
NSAccessibilityStringForRangeParameterizedAttribute,
NSAccessibilityLineForIndexParameterizedAttribute,
NSAccessibilityRangeForLineParameterizedAttribute,
NSAccessibilityAttributedStringForRangeParameterizedAttribute,
NSAccessibilityBoundsForRangeParameterizedAttribute,
#if DEBUG
NSAccessibilityRangeForPositionParameterizedAttribute,
NSAccessibilityRangeForIndexParameterizedAttribute,
NSAccessibilityRTFForRangeParameterizedAttribute,
NSAccessibilityStyleRangeForIndexParameterizedAttribute,
#endif
nil
];
}
return supportedParametrizedAttributes;
}
- (id)accessibilityAttributeValue:(NSString*)attribute forParameter:(id)parameter
{
if (!mGeckoTextAccessible)
return nil;
if ([attribute isEqualToString:NSAccessibilityStringForRangeParameterizedAttribute]) {
NSRange range;
if (!ToNSRange(parameter, &range)) {
#if DEBUG
NSLog(@"%@: range not set", attribute);
#endif
return @"";
}
return [self stringFromRange:&range];
}
if ([attribute isEqualToString:NSAccessibilityRangeForLineParameterizedAttribute]) {
// XXX: actually get the integer value for the line #
return [NSValue valueWithRange:NSMakeRange(0, [self textLength])];
}
if ([attribute isEqualToString:NSAccessibilityAttributedStringForRangeParameterizedAttribute]) {
NSRange range;
if (!ToNSRange(parameter, &range)) {
#if DEBUG
NSLog(@"%@: range not set", attribute);
#endif
return @"";
}
return [[[NSAttributedString alloc] initWithString:[self stringFromRange:&range]] autorelease];
}
if ([attribute isEqualToString:NSAccessibilityLineForIndexParameterizedAttribute]) {
// XXX: actually return the line #
return [NSNumber numberWithInt:0];
}
if ([attribute isEqualToString:NSAccessibilityBoundsForRangeParameterizedAttribute]) {
NSRange range;
if (!ToNSRange(parameter, &range)) {
#if DEBUG
NSLog(@"%@:no range", attribute);
#endif
return nil;
}
int32_t start = range.location;
int32_t end = start + range.length;
nsIntRect bounds = mGeckoTextAccessible->TextBounds(start, end);
return [NSValue valueWithRect:nsCocoaUtils::GeckoRectToCocoaRect(bounds)];
}
#if DEBUG
NSLog(@"unhandled attribute:%@ forParameter:%@", attribute, parameter);
#endif
return nil;
}
- (BOOL)accessibilityIsAttributeSettable:(NSString*)attribute
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
if ([attribute isEqualToString:NSAccessibilityValueAttribute])
return ![self isReadOnly];
if ([attribute isEqualToString:NSAccessibilitySelectedTextAttribute] ||
[attribute isEqualToString:NSAccessibilitySelectedTextRangeAttribute] ||
[attribute isEqualToString:NSAccessibilityVisibleCharacterRangeAttribute])
return YES;
return [super accessibilityIsAttributeSettable:attribute];
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NO);
}
- (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if (!mGeckoTextAccessible)
return;
if ([attribute isEqualToString:NSAccessibilityValueAttribute]) {
[self setText:ToNSString(value)];
return;
}
if ([attribute isEqualToString:NSAccessibilitySelectedTextAttribute]) {
NSString* stringValue = ToNSString(value);
if (!stringValue)
return;
int32_t start = 0, end = 0;
mGeckoTextAccessible->SelectionBoundsAt(0, &start, &end);
mGeckoTextAccessible->DeleteText(start, end - start);
nsString text;
nsCocoaUtils::GetStringForNSString(stringValue, text);
mGeckoTextAccessible->InsertText(text, start);
}
if ([attribute isEqualToString:NSAccessibilitySelectedTextRangeAttribute]) {
NSRange range;
if (!ToNSRange(value, &range))
return;
mGeckoTextAccessible->SetSelectionBoundsAt(0, range.location,
range.location + range.length);
return;
}
if ([attribute isEqualToString:NSAccessibilityVisibleCharacterRangeAttribute]) {
NSRange range;
if (!ToNSRange(value, &range))
return;
mGeckoTextAccessible->ScrollSubstringTo(range.location, range.location + range.length,
nsIAccessibleScrollType::SCROLL_TYPE_TOP_EDGE);
return;
}
[super accessibilitySetValue:value forAttribute:attribute];
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (NSString*)subrole
{
if(mRole == roles::PASSWORD_TEXT)
return NSAccessibilitySecureTextFieldSubrole;
return nil;
}
- (void)expire
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
mGeckoTextAccessible = nullptr;
[super expire];
NS_OBJC_END_TRY_ABORT_BLOCK;
}
#pragma mark -
- (BOOL)isReadOnly
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
if ([[self role] isEqualToString:NSAccessibilityStaticTextRole])
return YES;
if (mGeckoTextAccessible)
return (mGeckoAccessible->State() & states::READONLY) == 0;
return NO;
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(NO);
}
- (NSNumber*)caretLineNumber
{
int32_t lineNumber = mGeckoTextAccessible ?
mGeckoTextAccessible->CaretLineNumber() - 1 : -1;
return (lineNumber >= 0) ? [NSNumber numberWithInt:lineNumber] : nil;
}
- (void)setText:(NSString*)aNewString
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
if (mGeckoTextAccessible) {
nsString text;
nsCocoaUtils::GetStringForNSString(aNewString, text);
mGeckoTextAccessible->ReplaceText(text);
}
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (NSString*)text
{
if (!mGeckoAccessible || !mGeckoTextAccessible)
return nil;
// A password text field returns an empty value
if (mRole == roles::PASSWORD_TEXT)
return @"";
nsAutoString text;
mGeckoTextAccessible->TextSubstring(0,
nsIAccessibleText::TEXT_OFFSET_END_OF_TEXT,
text);
return nsCocoaUtils::ToNSString(text);
}
- (long)textLength
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
if (!mGeckoAccessible || !mGeckoTextAccessible)
return 0;
return mGeckoTextAccessible ? mGeckoTextAccessible->CharacterCount() : 0;
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(0);
}
- (long)selectedTextLength
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_RETURN;
if (mGeckoTextAccessible) {
int32_t start = 0, end = 0;
mGeckoTextAccessible->SelectionBoundsAt(0, &start, &end);
return (end - start);
}
return 0;
NS_OBJC_END_TRY_ABORT_BLOCK_RETURN(0);
}
- (NSString*)selectedText
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if (mGeckoTextAccessible) {
int32_t start = 0, end = 0;
mGeckoTextAccessible->SelectionBoundsAt(0, &start, &end);
if (start != end) {
nsAutoString selText;
mGeckoTextAccessible->TextSubstring(start, end, selText);
return nsCocoaUtils::ToNSString(selText);
}
}
return nil;
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (NSValue*)selectedTextRange
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK_NIL;
if (mGeckoTextAccessible) {
int32_t start = 0;
int32_t end = 0;
int32_t count = mGeckoTextAccessible->SelectionCount();
if (count) {
mGeckoTextAccessible->SelectionBoundsAt(0, &start, &end);
return [NSValue valueWithRange:NSMakeRange(start, end - start)];
}
start = mGeckoTextAccessible->CaretOffset();
return [NSValue valueWithRange:NSMakeRange(start != -1 ? start : 0, 0)];
}
return [NSValue valueWithRange:NSMakeRange(0, 0)];
NS_OBJC_END_TRY_ABORT_BLOCK_NIL;
}
- (NSValue*)visibleCharacterRange
{
// XXX this won't work with Textarea and such as we actually don't give
// the visible character range.
return [NSValue valueWithRange:
NSMakeRange(0, mGeckoTextAccessible ?
mGeckoTextAccessible->CharacterCount() : 0)];
}
- (void)valueDidChange
{
NS_OBJC_BEGIN_TRY_ABORT_BLOCK;
NSAccessibilityPostNotification(GetObjectOrRepresentedView(self),
NSAccessibilityValueChangedNotification);
NS_OBJC_END_TRY_ABORT_BLOCK;
}
- (void)selectedTextDidChange
{
NSAccessibilityPostNotification(GetObjectOrRepresentedView(self),
NSAccessibilitySelectedTextChangedNotification);
}
- (NSString*)stringFromRange:(NSRange*)range
{
NS_PRECONDITION(mGeckoTextAccessible && range, "no Gecko text accessible or range");
nsAutoString text;
mGeckoTextAccessible->TextSubstring(range->location,
range->location + range->length, text);
return nsCocoaUtils::ToNSString(text);
}
@end
@implementation mozTextLeafAccessible
- (NSArray*)accessibilityAttributeNames
{
static NSMutableArray* supportedAttributes = nil;
if (!supportedAttributes) {
supportedAttributes = [[super accessibilityAttributeNames] mutableCopy];
[supportedAttributes removeObject:NSAccessibilityChildrenAttribute];
}
return supportedAttributes;
}
- (id)accessibilityAttributeValue:(NSString*)attribute
{
if ([attribute isEqualToString:NSAccessibilityTitleAttribute])
return @"";
if ([attribute isEqualToString:NSAccessibilityValueAttribute])
return [self text];
return [super accessibilityAttributeValue:attribute];
}
- (NSString*)text
{
if (!mGeckoAccessible)
return nil;
return nsCocoaUtils::ToNSString(mGeckoAccessible->AsTextLeaf()->Text());
}
- (long)textLength
{
if (!mGeckoAccessible)
return 0;
return mGeckoAccessible->AsTextLeaf()->Text().Length();
}
@end