gecko-dev/accessible/mac/Platform.mm

/* -*- Mode: Objective-C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 <Cocoa/Cocoa.h>

#include "Platform.h"
#include "ProxyAccessible.h"

#include "nsAppShell.h"

namespace mozilla {
namespace a11y {

// Mac a11y whitelisting
static bool sA11yShouldBeEnabled = false;

bool
ShouldA11yBeEnabled()
{
  EPlatformDisabledState disabledState = PlatformDisabledState();
  return (disabledState == ePlatformIsForceEnabled) || ((disabledState == ePlatformIsEnabled) && sA11yShouldBeEnabled);
}

void
PlatformInit()
{
}

void
PlatformShutdown()
{
}

void
ProxyCreated(ProxyAccessible* aProxy, uint32_t)
{
  // Pass in dummy state for now as retrieving proxy state requires IPC.
  Class type = GetTypeFromRole(aProxy->Role());
  uintptr_t accWrap = reinterpret_cast<uintptr_t>(aProxy) | IS_PROXY;
  mozAccessible* mozWrapper = [[type alloc] initWithAccessible:accWrap];
  aProxy->SetWrapper(reinterpret_cast<uintptr_t>(mozWrapper));
}

void
ProxyDestroyed(ProxyAccessible* aProxy)
{
  mozAccessible* wrapper = GetNativeFromProxy(aProxy);
  [wrapper expire];
  [wrapper release];
  aProxy->SetWrapper(0);
}

void
ProxyEvent(ProxyAccessible* aProxy, uint32_t aEventType)
{
  // ignore everything but focus-changed, value-changed, caret and selection
  // events for now.
  if (aEventType != nsIAccessibleEvent::EVENT_FOCUS &&
      aEventType != nsIAccessibleEvent::EVENT_VALUE_CHANGE &&
      aEventType != nsIAccessibleEvent::EVENT_TEXT_CARET_MOVED &&
      aEventType != nsIAccessibleEvent::EVENT_TEXT_SELECTION_CHANGED)
    return;

  mozAccessible* wrapper = GetNativeFromProxy(aProxy);
  if (wrapper)
    FireNativeEvent(wrapper, aEventType);
}

void
ProxyStateChangeEvent(ProxyAccessible* aProxy, uint64_t, bool)
{
  // mac doesn't care about state change events
}

void
ProxyCaretMoveEvent(ProxyAccessible* aTarget, int32_t aOffset)
{
  mozAccessible* wrapper = GetNativeFromProxy(aTarget);
  if (wrapper)
    [wrapper selectedTextDidChange];
}

} // namespace a11y
} // namespace mozilla

@interface GeckoNSApplication(a11y)
-(void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute;
@end

@implementation GeckoNSApplication(a11y)

-(void)accessibilitySetValue:(id)value forAttribute:(NSString*)attribute
{
  if ([attribute isEqualToString:@"AXEnhancedUserInterface"])
    mozilla::a11y::sA11yShouldBeEnabled = ([value intValue] == 1);

  return [super accessibilitySetValue:value forAttribute:attribute];
}

@end