#include "sui.h"
sui::sui(QWidget *parent)
    : QWidget(parent),
      m_layout(new QVBoxLayout),
      m_widget(new QWidget),
      m_press(false),
      m_border_width(2),
      ori(NONE)
{
    m_title = new sui_title(this);
    setObjectName(tr("m_widget"));
    m_layout->addWidget(m_title);
    m_title->setMouseTracking(true);
    m_layout->setContentsMargins(5, 5, 5, 5);
    m_layout->setSpacing(0);
    setWindowFlags(Qt::FramelessWindowHint);
    setAttribute(Qt::WA_TranslucentBackground);
    setMouseTracking(true);
    setBaseSize(1260, 800);
    resize(1260, 800);
    setLayout(m_layout);
    connect(m_title, SIGNAL(signals_close()), this, SLOT(close()));
}
sui::~sui()
{
}

void sui::showEvent(QShowEvent *event)
{
    this->setAttribute(Qt::WA_Mapped);
    QWidget::showEvent(event);
    QSize oldSize = this->size();
    resize(oldSize + QSize(10, 10));
    resize(oldSize);
}

void sui::paintEvent(QPaintEvent *event)
{
    QStyleOption opt;
    opt.initFrom(this);
    QPainter painter(this);
    style()->drawPrimitive(QStyle::PE_Widget, &opt, &painter, this);
    painter.setRenderHint(QPainter::Antialiasing);
    painter.drawRoundedRect(this->rect(), 10, 10);
    QWidget::paintEvent(event);
}

void sui::region(const QPoint &currentGlobalPoint)
{
    // 获取窗体在屏幕上的位置区域，topLeft为坐上角点，rightButton为右下角点
    QRect rect = this->rect();
    
    // 将左上角的(0,0)转化为全局坐标
    QPoint topLeft = this->mapToGlobal(rect.topLeft()); 
    QPoint rightButton = this->mapToGlobal(rect.bottomRight());
    
    // 当前鼠标的坐标
    int x = currentGlobalPoint.x(); 
    int y = currentGlobalPoint.y();
    if (((topLeft.x() + m_border_width >= x) && (topLeft.x() <= x)) && ((topLeft.y() + m_border_width >= y) && (topLeft.y() <= y)))
    {
        // 左上角
        ori = LEFTTOP;
        // 设置光标形状
        this->setCursor(QCursor(Qt::SizeFDiagCursor)); 
    }
    else if (((x >= rightButton.x() - m_border_width) && (x <= rightButton.x())) && ((y >= rightButton.y() - m_border_width) && (y <= rightButton.y())))
    {
        // 右下角
        ori = RIGHTBOTTOM;
        this->setCursor(QCursor(Qt::SizeFDiagCursor));
    }
    else if (((x <= topLeft.x() + m_border_width) && (x >= topLeft.x())) && ((y >= rightButton.y() - m_border_width) && (y <= rightButton.y())))
    {
        // 左下角
        ori = LEFTBOTTOM;
        this->setCursor(QCursor(Qt::SizeBDiagCursor));
    }
    else if (((x <= rightButton.x()) && (x >= rightButton.x() - m_border_width)) && ((y >= topLeft.y()) && (y <= topLeft.y() + m_border_width)))
    {
        // 右上角
        ori = RIGHTTOP;
        this->setCursor(QCursor(Qt::SizeBDiagCursor));
    }
    else if ((x <= topLeft.x() + m_border_width) && (x >= topLeft.x()))
    {
        // 左边
        ori = LEFT;
        this->setCursor(QCursor(Qt::SizeHorCursor));
    }
    else if ((x <= rightButton.x()) && (x >= rightButton.x() - m_border_width))
    {
        // 右边
        ori = RIGHT;
        this->setCursor(QCursor(Qt::SizeHorCursor));
    }
    else if ((y >= topLeft.y()) && (y <= topLeft.y() + m_border_width))
    {
        // 上边
        ori = UP;
        this->setCursor(QCursor(Qt::SizeVerCursor));
    }
    else if ((y <= rightButton.y()) && (y >= rightButton.y() - m_border_width))
    {
        // 下边
        ori = DOWN;
        this->setCursor(QCursor(Qt::SizeVerCursor));
    }
    else
    {
        // 默认
        ori = NONE;
        this->setCursor(QCursor(Qt::ArrowCursor));
    }
}

void sui::mousePressEvent(QMouseEvent *event)
{
    switch (event->button())
    {
    case Qt::LeftButton:
        m_press = true;
        if (ori != NONE)
        {
            // 返回当前抓取鼠标输入的窗口
            this->mouseGrabber();
        }
        else
        {
            m_point = event->globalPosition().toPoint() - this->frameGeometry().topLeft();
            // globalPos()鼠标位置，topLeft()窗口左上角的位置
        }
        break;
    case Qt::RightButton:
        //this->setWindowState(Qt::WindowMinimized);
        break;
    default:
        QWidget::mousePressEvent(event);
    }
}
void sui::mouseMoveEvent(QMouseEvent *event)
{

    QPoint globalPoint = event->globalPosition().toPoint();

    QRect rect = this->rect();
    QPoint topLeft = mapToGlobal(rect.topLeft());
    QPoint bottomRight = mapToGlobal(rect.bottomRight());

    if (this->windowState() != Qt::WindowMaximized)
    {
        // 没有按下左键时
        if (!m_press)
        {
            // 窗口大小的改变——判断鼠标位置，改变光标形状
            this->region(globalPoint);
        }
        else
        {
            if (ori != NONE)
            {
                QRect newRect(topLeft, bottomRight);

                switch (ori)
                {
                case LEFT:

                    if (bottomRight.x() - globalPoint.x() <= this->minimumWidth())
                    {
                        // 小于界面的最小宽度时，设置为左上角横坐标为窗口x
                        newRect.setLeft(topLeft.x());
                        // 只改变左边界
                    }
                    else
                    {
                        newRect.setLeft(globalPoint.x());
                    }
                    break;
                case RIGHT:
                    // 只能改变右边界
                    newRect.setWidth(globalPoint.x() - topLeft.x());
                    break;
                case UP:
                    if (bottomRight.y() - globalPoint.y() <= this->minimumHeight())
                    {
                        newRect.setY(topLeft.y());
                    }
                    else
                    {
                        newRect.setY(globalPoint.y());
                    }
                    break;
                case DOWN:
                    newRect.setHeight(globalPoint.y() - topLeft.y());
                    break;
                case LEFTTOP:
                    if (bottomRight.x() - globalPoint.x() <= this->minimumWidth())
                    {
                        newRect.setX(topLeft.x());
                    }
                    else
                    {
                        newRect.setX(globalPoint.x());
                    }

                    if (bottomRight.y() - globalPoint.y() <= this->minimumHeight())
                    {
                        newRect.setY(topLeft.y());
                    }
                    else
                    {
                        newRect.setY(globalPoint.y());
                    }
                    break;
                case RIGHTTOP:
                    if (globalPoint.x() - topLeft.x() >= this->minimumWidth())
                    {
                        newRect.setWidth(globalPoint.x() - topLeft.x());
                    }
                    else
                    {
                        newRect.setWidth(bottomRight.x() - topLeft.x());
                    }
                    if (bottomRight.y() - globalPoint.y() >= this->minimumHeight())
                    {
                        newRect.setY(globalPoint.y());
                    }
                    else
                    {
                        newRect.setY(topLeft.y());
                    }
                    break;
                case LEFTBOTTOM:
                    if (bottomRight.x() - globalPoint.x() >= this->minimumWidth())
                    {
                        newRect.setX(globalPoint.x());
                    }
                    else
                    {
                        newRect.setX(topLeft.x());
                    }
                    if (globalPoint.y() - topLeft.y() >= this->minimumHeight())
                    {
                        newRect.setHeight(globalPoint.y() - topLeft.y());
                    }
                    else
                    {
                        newRect.setHeight(bottomRight.y() - topLeft.y());
                    }
                    break;
                case RIGHTBOTTOM:
                    newRect.setWidth(globalPoint.x() - topLeft.x());
                    newRect.setHeight(globalPoint.y() - topLeft.y());
                    break;
                default:
                    break;
                }
                this->setGeometry(newRect);
            }
            else
            {
                // 移动窗口
                move(event->globalPosition().toPoint() - m_point);
                event->accept();
            }
        }
    }
}

// 鼠标释放事件
void sui::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton)
    {
        m_press = false;
        if (ori != NONE)
        {
            // 释放鼠标抓取
            this->releaseMouse();
            this->setCursor(QCursor(Qt::ArrowCursor));
            ori = NONE;
        }
    }
}