1 files changed, 154 insertions, 0 deletions
diff --git a/vcl/unx/gtk3/a11y/atkvalue.cxx b/vcl/unx/gtk3/a11y/atkvalue.cxx
new file mode 100644
index 0000000000..014164da20
--- /dev/null
+++ b/vcl/unx/gtk3/a11y/atkvalue.cxx
@@ -0,0 +1,154 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * 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/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include "atkwrapper.hxx"
+
+#include <com/sun/star/accessibility/XAccessibleValue.hpp>
+
+#include <cmath>
+#include <string.h>
+
+using namespace ::com::sun::star;
+
+/// @throws uno::RuntimeException
+static css::uno::Reference<css::accessibility::XAccessibleValue>
+    getValue( AtkValue *pValue )
+{
+    AtkObjectWrapper *pWrap = ATK_OBJECT_WRAPPER( pValue );
+    if( pWrap )
+    {
+        if( !pWrap->mpValue.is() )
+        {
+            pWrap->mpValue.set(pWrap->mpContext, css::uno::UNO_QUERY);
+        }
+
+        return pWrap->mpValue;
+    }
+
+    return css::uno::Reference<css::accessibility::XAccessibleValue>();
+}
+
+static void anyToGValue( const uno::Any& aAny, GValue *pValue )
+{
+    // FIXME: expand to lots of types etc.
+    double aDouble=0;
+    aAny >>= aDouble;
+
+    memset( pValue,  0, sizeof( GValue ) );
+    g_value_init( pValue, G_TYPE_DOUBLE );
+    g_value_set_double( pValue, aDouble );
+}
+
+extern "C" {
+
+static void
+value_wrapper_get_current_value( AtkValue *value,
+                                 GValue   *gval )
+{
+    try {
+        css::uno::Reference<css::accessibility::XAccessibleValue> pValue
+            = getValue( value );
+        if( pValue.is() )
+            anyToGValue( pValue->getCurrentValue(), gval );
+    }
+    catch(const uno::Exception&) {
+        g_warning( "Exception in getCurrentValue()" );
+    }
+}
+
+static void
+value_wrapper_get_maximum_value( AtkValue *value,
+                                 GValue   *gval )
+{
+    try {
+        css::uno::Reference<css::accessibility::XAccessibleValue> pValue
+            = getValue( value );
+        if( pValue.is() )
+            anyToGValue( pValue->getMaximumValue(), gval );
+    }
+    catch(const uno::Exception&) {
+        g_warning( "Exception in getCurrentValue()" );
+    }
+}
+
+static void
+value_wrapper_get_minimum_value( AtkValue *value,
+                                 GValue   *gval )
+{
+    try {
+        css::uno::Reference<css::accessibility::XAccessibleValue> pValue
+            = getValue( value );
+        if( pValue.is() )
+            anyToGValue( pValue->getMinimumValue(), gval );
+    }
+    catch(const uno::Exception&) {
+        g_warning( "Exception in getCurrentValue()" );
+    }
+}
+
+static gboolean
+value_wrapper_set_current_value( AtkValue     *value,
+                                 const GValue *gval )
+{
+    try {
+        css::uno::Reference<css::accessibility::XAccessibleValue> pValue
+            = getValue( value );
+        if( pValue.is() )
+        {
+            double aDouble = g_value_get_double( gval );
+
+            // Different types of numerical values for XAccessibleValue are possible.
+            // If current value has an integer type, also use that for the new value, to make
+            // sure underlying implementations expecting that can handle the value properly.
+            const css::uno::Any aCurrentValue = pValue->getCurrentValue();
+            if (aCurrentValue.getValueTypeClass() == css::uno::TypeClass::TypeClass_LONG)
+            {
+                const sal_Int32 nValue = std::round<sal_Int32>(aDouble);
+                return pValue->setCurrentValue(css::uno::Any(nValue));
+            }
+            else if (aCurrentValue.getValueTypeClass() == css::uno::TypeClass::TypeClass_HYPER)
+            {
+                const sal_Int64 nValue = std::round<sal_Int64>(aDouble);
+                return pValue->setCurrentValue(css::uno::Any(nValue));
+            }
+
+            return pValue->setCurrentValue( uno::Any(aDouble) );
+        }
+    }
+    catch(const uno::Exception&) {
+        g_warning( "Exception in getCurrentValue()" );
+    }
+
+    return FALSE;
+}
+
+} // extern "C"
+
+void
+valueIfaceInit (AtkValueIface *iface)
+{
+  g_return_if_fail (iface != nullptr);
+
+  iface->get_current_value = value_wrapper_get_current_value;
+  iface->get_maximum_value = value_wrapper_get_maximum_value;
+  iface->get_minimum_value = value_wrapper_get_minimum_value;
+  iface->set_current_value = value_wrapper_set_current_value;
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */