gecko-dev/accessible/atk/nsMaiInterfaceValue.cpp

/* -*- Mode: 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/. */

#include "InterfaceInitFuncs.h"

#include "AccessibleWrap.h"
#include "nsMai.h"
#include "RemoteAccessible.h"
#include "mozilla/FloatingPoint.h"
#include "mozilla/Likely.h"

using namespace mozilla;
using namespace mozilla::a11y;

extern "C" {

static void getCurrentValueCB(AtkValue* obj, GValue* value) {
  Accessible* acc = GetInternalObj(ATK_OBJECT(obj));
  if (!acc) {
    return;
  }

  memset(value, 0, sizeof(GValue));
  double accValue = acc->CurValue();
  if (IsNaN(accValue)) return;

  g_value_init(value, G_TYPE_DOUBLE);
  g_value_set_double(value, accValue);
}

static void getMaximumValueCB(AtkValue* obj, GValue* value) {
  Accessible* acc = GetInternalObj(ATK_OBJECT(obj));
  if (!acc) {
    return;
  }

  memset(value, 0, sizeof(GValue));
  double accValue = acc->MaxValue();
  if (IsNaN(accValue)) return;

  g_value_init(value, G_TYPE_DOUBLE);
  g_value_set_double(value, accValue);
}

static void getMinimumValueCB(AtkValue* obj, GValue* value) {
  Accessible* acc = GetInternalObj(ATK_OBJECT(obj));
  if (!acc) {
    return;
  }

  memset(value, 0, sizeof(GValue));
  double accValue = acc->MinValue();
  if (IsNaN(accValue)) return;

  g_value_init(value, G_TYPE_DOUBLE);
  g_value_set_double(value, accValue);
}

static void getMinimumIncrementCB(AtkValue* obj, GValue* minimumIncrement) {
  Accessible* acc = GetInternalObj(ATK_OBJECT(obj));
  if (!acc) {
    return;
  }

  memset(minimumIncrement, 0, sizeof(GValue));
  double accValue = acc->Step();
  if (IsNaN(accValue)) {
    accValue = 0;  // zero if the minimum increment is undefined
  }

  g_value_init(minimumIncrement, G_TYPE_DOUBLE);
  g_value_set_double(minimumIncrement, accValue);
}

static gboolean setCurrentValueCB(AtkValue* obj, const GValue* value) {
  RemoteAccessible* proxy = nullptr;
  AccessibleWrap* accWrap = GetAccessibleWrap(ATK_OBJECT(obj));
  if (!accWrap) {
    proxy = GetProxy(ATK_OBJECT(obj));
    if (!proxy) {
      return FALSE;
    }
  }

  double accValue = g_value_get_double(value);
  return accWrap ? accWrap->SetCurValue(accValue)
                 : proxy->SetCurValue(accValue);
}
}

void valueInterfaceInitCB(AtkValueIface* aIface) {
  NS_ASSERTION(aIface, "Invalid aIface");
  if (MOZ_UNLIKELY(!aIface)) return;

  aIface->get_current_value = getCurrentValueCB;
  aIface->get_maximum_value = getMaximumValueCB;
  aIface->get_minimum_value = getMinimumValueCB;
  aIface->get_minimum_increment = getMinimumIncrementCB;
  aIface->set_current_value = setCurrentValueCB;
}