/*
* All or portions of this file Copyright (c) Amazon.com, Inc. or its affiliates or
* its licensors.
*
* For complete copyright and license terms please see the LICENSE at the root of this
* distribution (the "License"). All use of this software is governed by the License,
* or, if provided, by the license below or the license accompanying this file. Do not
* remove or modify any license notices. This file is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
*
*/

#include "StdAfx.h"
#include "EditorPreferencesTreeWidgetItemDelegate.h"
#include <QIcon>
#include <QPainter>
#include <QStyledItemDelegate>

static const int IconX = 26;
static const int TextX = 27;

EditorPreferencesTreeWidgetItemDelegate::EditorPreferencesTreeWidgetItemDelegate(QWidget* parent)
    : QStyledItemDelegate(parent)
{
    m_mouseOverBrush = QBrush(QColor(0x40, 0x40, 0x40));
    m_selectedBrush = QBrush(QColor(0x47, 0x47, 0x47));
}

void EditorPreferencesTreeWidgetItemDelegate::paint(QPainter* painter, const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    painter->save();
    painter->setPen(Qt::NoPen);

    const auto textHeight = option.fontMetrics.height();
    int vCenter = option.rect.bottom() - option.rect.height() / 2;
    int iconSize = option.decorationSize.width();

    if ((option.state & QStyle::State_Selected) || (option.state & QStyle::State_MouseOver))
    {
        if ((option.state & QStyle::State_Selected))
        {
            painter->setBrush(m_selectedBrush);
        }
        else if ((option.state & QStyle::State_MouseOver))
        {
            painter->setBrush(m_mouseOverBrush);
        }

        const QRect backGroundRect(option.rect.left(), option.rect.top(), option.rect.width(), option.rect.height());
        painter->drawRect(backGroundRect);
    }

    const auto& iconVariant = index.data(Qt::DecorationRole);
    if (!iconVariant.isNull())
    {
        const auto& icon = iconVariant.value<QIcon>();
        QRect r(IconX, vCenter - iconSize/2, iconSize, iconSize);
        r.setX(-r.width());
        icon.paint(painter, r);
    }

    const QString& text = index.data(Qt::DisplayRole).toString();
    painter->setPen(Qt::white);
    const auto textRect = QRect{ TextX, vCenter - textHeight/2, option.rect.width() - TextX, textHeight };
    painter->drawText(textRect, Qt::AlignLeft | Qt::AlignVCenter, text);

    painter->restore();
}

QSize EditorPreferencesTreeWidgetItemDelegate::sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const
{
    return QStyledItemDelegate::sizeHint(option, index);
}

#include <EditorPreferencesTreeWidgetItemDelegate.moc>