#include "WindowAppUiNavView.h"
#include "CommonDraw.h"
//
//// 缩略图界面的宽高比
//#define HEIGHT_SCALE			0.75

// 固定UI缩略图高度
#define FIXED_HEIGHT			200

WindowAppUiNavView::WindowAppUiNavView(QWidget*parent)
	: QGraphicsView(parent)
	, m_mainView(nullptr)
	, m_mouseDown(false)
	, m_viewportRegion(this->rect())
{
	// 初始化界面风格
	initStyle();
}

WindowAppUiNavView::~WindowAppUiNavView()
{
}


/// <summary>
/// 初始化界面风格
/// </summary>
void WindowAppUiNavView::initStyle()
{
	// 固定高度
	this->setFixedHeight(FIXED_HEIGHT);

	// 与Scene一起设置为居中对齐
	this->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);

	// 隐藏横纵向两个滚动条
	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

	// 设置背景色
	setStyleSheet(
		"background-color: rgb(61,61,61);" 
		"border-radius: 3px;"
	);
}


/// <summary>
/// 绑定主视图
/// </summary>
/// <param name="mainView"></param>
void WindowAppUiNavView::setMainView(QGraphicsView* mainView)
{
	m_mainView = mainView;
}


/// <summary>
/// 刷新界面坐标
/// </summary>
void WindowAppUiNavView::updateMainViewportRegion()
{
	if (m_mainView != nullptr)
	{
		m_viewportRegion = mapFromScene(m_mainView->mapToScene(m_mainView->rect()));
		update();
	}
}


/// <summary>
/// 鼠标左键点在鸟瞰图时，设置Pou界面随动
/// </summary>
/// <param name="event"></param>
void WindowAppUiNavView::mousePressEvent(QMouseEvent* event)
{
	m_mouseDown = true;

	if (m_mainView)
	{
		m_mainView->centerOn(mapToScene(event->pos()));
		update();
	}

	event->accept();
}


/// <summary>
/// 鼠标移动时，设置Pou界面随动
/// </summary>
/// <param name="event"></param>
void WindowAppUiNavView::mouseMoveEvent(QMouseEvent* event)
{
	if (m_mouseDown && m_mainView)
	{
		m_mainView->centerOn(mapToScene(event->pos()));
		update();
		event->accept();
	}
	else
	{
		event->ignore();
	}
}


/// <summary>
/// 退出Pou视图的随动状态
/// </summary>
/// <param name="event"></param>
void WindowAppUiNavView::mouseReleaseEvent(QMouseEvent* event)
{
	m_mouseDown = false;

	event->accept();
}


/// <summary>
/// 忽略滚轮消息
/// </summary>
/// <param name="event"></param>
void WindowAppUiNavView::wheelEvent(QWheelEvent* event)
{
	event->ignore();
	return QGraphicsView::wheelEvent(event);
}


///// <summary>
///// 处理缩放消息，固定宽高比
///// </summary>
///// <param name="resizeEvent"></param>
//void WindowAppUiNavView::resizeEvent(QResizeEvent* resizeEvent)
//{
//	//int nWidth = resizeEvent->size().width();
//
//	//this->setFixedHeight(nWidth * HEIGHT_SCALE);
//}


/// <summary>
/// 绘制预览窗口边框
/// </summary>
/// <param name="event"></param>
void WindowAppUiNavView::paintEvent(QPaintEvent* event)
{
	int x = (width() / 2) - (m_viewportRegion.boundingRect().width() / 2);
	QRect rect =  m_viewportRegion.boundingRect();
	rect.moveLeft(x);


	QPainter painter(viewport());
	painter.setPen(QPen(Qt::gray, 1));
	painter.drawRect(rect);

	// 计算坐标
	int nTop = rect.top() ;

	int nWwidth = rect.width();
	int nHeight = rect.height() ;

	int nStepW = (nWwidth) / 3 ;
	int nStepH = (nHeight ) / 3;

	painter.setPen(UI_LINE_BK_PEN);
	
	// 画两条横线
	painter.drawLine(QLine(x, nStepH,  nWwidth + x, nStepH));
	painter.drawLine(QLine(x, nStepH * 2, nWwidth + x , nStepH * 2));

	// 画两条竖线
	painter.drawLine(QLine(nStepW + x, nTop, nStepW + x, nHeight));
	painter.drawLine(QLine(nStepW * 2 + x, nTop, nStepW * 2 + x, nHeight));

	QGraphicsView::paintEvent(event);
}