/**
 * @file PaiTreeItemDelegate.h
 * @brief PAI系统中常见的数据树节点ItemDelegate类
 * @date 2011-09-29
 */
#include <QPainter>
#include <QPen>
#include <QBrush>
#include <QLinearGradient>
#include <QStyleOptionViewItemV4>
#include <QStyleFactory>
#include <QApplication>

#include "PaiTreeItemDelegate.h"
#include "GlobalUtility.h"
#include "PaiLineEdit.h"

using namespace pai::gui;

QStyle *g_Style = QStyleFactory::create("motif");

PaiTreeItemDelegate::PaiTreeItemDelegate(QObject *pParent) :
    QStyledItemDelegate(pParent)
{
}

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

void PaiTreeItemDelegate::paint(QPainter *pPainter, const QStyleOptionViewItem & option, const QModelIndex & index) const
{
    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt, index);
    bool bSelected = opt.state & QStyle::State_Selected;
    if(!bSelected)
    {
        QVariant varIndexHilightData = index.data(pai::gui::HilightRole);
        if(varIndexHilightData.isValid()
                && (varIndexHilightData.type() == QVariant::Bool)
                && varIndexHilightData.toBool())
        {
            opt.state |= QStyle::State_Selected;
        }
    }

    // 在disable状态下，如果单击disable的节点，其它选中的节点不会被取消选中，但selectable可以做到这一点
    // 利用这一点，可以用selectable代替disable的部分功能
    // 将不可选择状态绘制为不可用状态的的样式
    if(!(index.flags() & Qt::ItemIsSelectable))
    {
        QStyle::State f = QStyle::State_Enabled;
        f = ~f;
        opt.state &= f;
    }

    QStyledItemDelegate::paint(pPainter, opt, index);
}

///////////////////////////////////////////////////////////////////////////////
PaiCagegoryTreeItemDelegate::PaiCagegoryTreeItemDelegate(QObject *pParent) :
    QStyledItemDelegate(pParent),
    m_RowHeight(40)
{
}

void PaiCagegoryTreeItemDelegate::SetRowHeight(int height)
{
    if(height <= 0)
    {
        return;
    }
    m_RowHeight = height;
}

void PaiCagegoryTreeItemDelegate::paint(QPainter *pPainter,
                                        const QStyleOptionViewItem & option,
                                        const QModelIndex & index) const
{
    QStyleOptionViewItemV4 opt = option;
    initStyleOption(&opt, index);
    bool bSelected = opt.state & QStyle::State_Selected;
    bool bHover = opt.state & QStyle::State_MouseOver;
    QPointF startPoint(0, 0);
    QPointF finalPoint(0, opt.rect.height());
    QLinearGradient linearGrad(startPoint, finalPoint);

    QPen pen;
    if(index.child(0, 0).isValid())
    {
        if(bSelected)
        {
            linearGrad.setColorAt(0, QColor("#F6FDFF"));
            linearGrad.setColorAt(1, QColor("#DAF3FD"));
        }
        else if(bHover)
        {
            linearGrad.setColorAt(0, QColor("#EAF9FE"));
            linearGrad.setColorAt(1, QColor("#D5E4F2"));
        }
        else
        {
            linearGrad.setColorAt(0, QColor("#E7F1F8"));
            linearGrad.setColorAt(1, QColor("#DAF3FD"));
        }
        opt.backgroundBrush = QBrush(linearGrad);

        pen = QPen(QBrush(QColor("#A8BBC6")), 1, Qt::SolidLine);
    }
    else
    {
        if(bSelected)
        {
            linearGrad.setColorAt(0, QColor("#F6FDFF"));
            linearGrad.setColorAt(1, QColor("#F6FDFF"));
        }
        pen = QPen(QBrush(QColor("#C9D5DC")), 1, Qt::DashLine);
    }

    const QWidget *pWidget = opt.widget;
    if(pWidget == NULL)
    {
        return;
    }
    QStyle *pStyle = pWidget ? pWidget->style() : QApplication::style();

    pStyle->drawControl(QStyle::CE_ItemViewItem, &opt, pPainter, pWidget);

    QPen oldPen(pPainter->pen());
    pPainter->setPen(pen);
    pPainter->drawLine(opt.rect.bottomLeft(), opt.rect.bottomRight());
    pPainter->setPen(oldPen);
    if(index.data(Qt::BackgroundRole).isValid())
    {
        if(index.data(Qt::BackgroundRole).value< QBrush > () != Qt::NoBrush)
        {
            pPainter->fillRect(opt.rect.adjusted(1, 10, -1, -10), index.data(Qt::BackgroundRole).value< QBrush > ());
        }
    }
}

QSize PaiCagegoryTreeItemDelegate::sizeHint(const QStyleOptionViewItem & option, const QModelIndex & index) const
{
    QSize sz = QStyledItemDelegate::sizeHint(option, index);
    sz.setHeight(m_RowHeight);
    return sz;
}

/////////////////////////////////////////////////////////////////////////////
PaiNameLimitedTreeItemDelegate::PaiNameLimitedTreeItemDelegate(QWidget *pParent) :
    PaiTreeItemDelegate(pParent)
{
    // 数据树重命名时，只接受输入字母、数字、汉字以及'_'、'-'和'.'，并且长度不能超过100个字符
    // 不接受以'.'开始的输入
    m_RegExp = QRegExp("([\u4e00-\u9fa50-9a-zA-Z_\\-\\.]){1,100}");
}

PaiNameLimitedTreeItemDelegate::PaiNameLimitedTreeItemDelegate(const QRegExp & regExp, QWidget *pParent) :
    PaiTreeItemDelegate(pParent)
{
    m_RegExp = regExp;
}

QWidget* PaiNameLimitedTreeItemDelegate::createEditor(QWidget *pParent,
                                                      const QStyleOptionViewItem & /*option*/,
                                                      const QModelIndex & /*index*/) const
{
    PaiLineEdit *pLineEdit = new PaiLineEdit(pParent);
    // 设置限定范围
    pLineEdit->setValidator(new QRegExpValidator(m_RegExp, pParent));

    return pLineEdit;
}

void PaiNameLimitedTreeItemDelegate::setEditorData(QWidget *pEditor, const QModelIndex & index) const
{
    PaiLineEdit *pEdit = dynamic_cast< PaiLineEdit* > (pEditor);
    if(pEdit)
    {
        pEdit->setText(index.model()->data(index, Qt::EditRole).toString());
    }
}

void PaiNameLimitedTreeItemDelegate::setModelData(QWidget *pEditor,
                                                  QAbstractItemModel *pModel,
                                                  const QModelIndex & index) const
{
    PaiLineEdit *pEdit = dynamic_cast< PaiLineEdit* > (pEditor);
    if(pEdit)
    {
        if(m_RegExp.exactMatch(pEdit->text()))
        {
            pModel->setData(index, pEdit->text(), Qt::EditRole);
            emit ModelDataChanged(index);
        }
        else
        {
            pEdit->setText(index.model()->data(index, Qt::EditRole).toString());
        }
    }
}

void PaiNameLimitedTreeItemDelegate::updateEditorGeometry(QWidget *pEditor,
                                                          const QStyleOptionViewItem & option,
                                                          const QModelIndex & /*index*/) const
{
    if(pEditor)
    {
        pEditor->setGeometry(option.rect);
    }
}