/****************************************************************************
**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
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** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
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** accordance with the commercial license agreement provided with the
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
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** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
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****************************************************************************/

#include <Carbon/Carbon.h>

#include "qnsview.h"
#include "qcocoahelpers.h"
#include "qcocoaaccessibility.h"
#include "qcocoaaccessibilityelement.h"

#include <QtGui/private/qaccessible2_p.h>
#include <QtCore/QDebug>

#import <AppKit/NSAccessibility.h>

#ifndef QT_NO_COCOA_ACCESSIBILITY

@implementation QNSView (QNSViewAccessibility)

// The QNSView is a container that the user does not interact directly with:
// Remove it from the user-visible accessibility tree.
- (BOOL)accessibilityIsIgnored {
    return YES;
}

- (id)accessibilityAttributeValue:(NSString *)attribute {
    if ([attribute isEqualToString:NSAccessibilityRoleAttribute]) {
        if (m_accessibleRoot)
            return QCocoaAccessible::macRole(m_accessibleRoot);
        return NSAccessibilityUnknownRole;
    } else if ([attribute isEqualToString:NSAccessibilityRoleDescriptionAttribute]) {
        return NSAccessibilityRoleDescriptionForUIElement(self);
    } else if ([attribute isEqualToString:NSAccessibilityChildrenAttribute]) {
        if (!m_accessibleRoot)
            return [super accessibilityAttributeValue:attribute];

        // Create QCocoaAccessibleElements for each child if the
        // root accessible interface.
        int numKids = m_accessibleRoot->childCount();
        NSMutableArray *kids = [NSMutableArray arrayWithCapacity:numKids];
        for (int i = 0; i < numKids; ++i) {
            QCocoaAccessibleElement *element = [QCocoaAccessibleElement createElementWithInterface: m_accessibleRoot->child(i) parent:self ];
            [kids addObject: element];
            [element release];
        }

        return kids;
    } else {
        return [super accessibilityAttributeValue:attribute];
    }
}

- (id)accessibilityHitTest:(NSPoint)point {
    if (!m_accessibleRoot)
        return [super accessibilityHitTest:point];

    QAccessibleInterface *childInterface = m_accessibleRoot->childAt(point.x, qt_mac_flipYCoordinate(point.y));
    // No child found, meaning we hit the NSView
    if (!childInterface) {
        return [super accessibilityHitTest:point];
    }

    // Hit a child, forward to child accessible interface.

    QCocoaAccessibleElement *accessibleElement = [QCocoaAccessibleElement createElementWithInterface: childInterface parent:self ];
    [accessibleElement autorelease];
    return [accessibleElement accessibilityHitTest:point];
}

@end

#endif // QT_NO_COCOA_ACCESSIBILITY