#include "WindowAppItemRefLine.h"
#include "../Common/Utility.h"


/// <summary>
/// 按照对应的参考线信息生成LineItem
/// </summary>
/// <param name="lineInfo"></param>
WindowAppItemRefLine::WindowAppItemRefLine(const UI_REFLINE_INFO& lineInfo):
	m_refLineInfo(lineInfo)
{

}


/// <summary>
/// 绘制线条
/// </summary>
/// <param name="painter"></param>
/// <param name="option"></param>
/// <param name="widget"></param>
void WindowAppItemRefLine::paint(QPainter* painter, const QStyleOptionGraphicsItem* option, QWidget* widget /*= nullptr*/)
{
	Q_UNUSED(option);
	Q_UNUSED(widget);

	// 计算最新的起点和终点
	QPoint startPt, endPt;
	this->calcLineVertex(m_refLineInfo.srcWidget, m_refLineInfo.dstWidget, startPt, endPt);

	// 设置连接线条
	this->setLine(QLine(startPt, endPt));

	// qDebug() << "WindowAppUiRefLine::paint - DrawRefLine - " << QLine(startPt, endPt);

	painter->setRenderHint(QPainter::Antialiasing, true);

	painter->save();

	// 虚线
	painter->setPen(QPen(COLOR_REFLINE, PEN_LINE_WIDTH, Qt::DashLine));

	// 绘制线条
	painter->drawLine(line());

	painter->restore();

}


/// <summary>
/// 根据最新的控件位置信息，计算当前参考线中的起点和终点信息（方向为从上到下，从左到右）
/// </summary>
/// <param name="startPoint"></param>
/// <param name="endPoint"></param>
void WindowAppItemRefLine::calcLineVertex(
	QWidget* srcWidget,
	QWidget* dstWidget,
	_Out_ QPoint& startPoint,
	_Out_ QPoint& endPoint
)
{
	// 竖线
	if (m_refLineInfo.srcSide == SIDE_DIRECTION::SIDE_LEFT
		|| m_refLineInfo.srcSide == SIDE_DIRECTION::SIDE_RIGHT)
	{
		QLine srcLine = Utility::getSideLineByID(srcWidget, (short)m_refLineInfo.srcSide);
		QLine dstLine = Utility::getSideLineByID(dstWidget, (short)m_refLineInfo.dstSide);
		
		// 取Y值最小的点作为起点（从上到下）

		// 起点边位于终点边下侧或者重合
		if (srcLine.p2().y() >= dstLine.p1().y())
		{
			startPoint = dstLine.p1();
			endPoint = srcLine.p2();
		}
		// 起点边位于终点边上侧
		else
		{
			startPoint = srcLine.p1();
			endPoint = dstLine.p2();
		}

		// 上下都需要额外加上延长线
		startPoint.setY(startPoint.y() - REFLINE_EXTENSION_LEN);
		endPoint.setY(endPoint.y() + REFLINE_EXTENSION_LEN);
	}

	// 横线
	else
	{
		QLine srcLine = Utility::getSideLineByID(srcWidget, (short)m_refLineInfo.srcSide);
		QLine dstLine = Utility::getSideLineByID(dstWidget, (short)m_refLineInfo.dstSide);

		// 取X值最小的点作为起点（从左到右）

		// 起点边位于终点边右侧或者重合
		if (srcLine.p2().x() >= dstLine.p1().x())
		{
			startPoint = dstLine.p1();
			endPoint = srcLine.p2();
		}
		// 起点边位于终点边左侧
		else
		{
			startPoint = srcLine.p1();
			endPoint = dstLine.p2();
		}

		// 上下都需要额外加上延长线
		startPoint.setX(startPoint.x() - REFLINE_EXTENSION_LEN);
		endPoint.setX(endPoint.x() + REFLINE_EXTENSION_LEN);
	}
}