#include "WindowAppPouNavView.h"
#include "WindowAppPouView.h"
#include "CommonDraw.h"


//===================================================================
//
//              WindowAppNavView::OpacityHelper
//
//===================================================================

WindowAppPouNavView::OpacityHelper::OpacityHelper(QWidget* parent)
	: QObject(parent)
	, m_opacityFx(new QGraphicsOpacityEffect(parent))
	, m_opacityAnimation(new QPropertyAnimation(m_opacityFx, "opacity"))
{
    // 设置透明窗体的显示效果
	parent->setGraphicsEffect(m_opacityFx);

    // 设置渐变动作的间隔
	m_opacityAnimation->setDuration(300);
}


/// <summary>
/// 设置透明度
/// </summary>
/// <param name="opacity"></param>
/// <param name="animated"></param>
void WindowAppPouNavView::OpacityHelper::setOpacity(qreal opacity, bool animated)
{
    // 是否采用渐变效果显示
	if (!animated)
    {
		m_opacityFx->setOpacity(opacity);
		return;
	}

    // 设置透明度的详细效果
	m_opacityAnimation->stop();
	m_opacityAnimation->setStartValue(m_opacityFx->opacity());
	m_opacityAnimation->setEndValue(opacity);
	m_opacityAnimation->start();
}


//===================================================================
//
//              WindowAppNavView
//
//===================================================================


WindowAppPouNavView::WindowAppPouNavView(QWidget *parent)
    : QGraphicsView (parent)
    , m_viewportRegion(this->rect())
    , m_opacityHelper(new OpacityHelper(this))
{
    // 初始化界面风格
    this->initStyle();
}


/// <summary>
/// 初始化界面风格
/// </summary>
void WindowAppPouNavView::initStyle()
{
	// 隐藏横纵向两个滚动条
	setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	// 设置背景色
	setStyleSheet("background-color: rgba(10, 10, 10, 128);"
		"border-radius: 3px;");
}


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


/// <summary>
/// 设置透明度
/// </summary>
/// <param name="opacity"></param>
/// <param name="animated"></param>
void WindowAppPouNavView::setOpacity(qreal opacity, bool animated)
{
	m_opacityHelper->setOpacity(opacity, animated);
}


/// <summary>
/// 刷新界面坐标（暂未使用）
/// </summary>
void WindowAppPouNavView::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 WindowAppPouNavView::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 WindowAppPouNavView::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 WindowAppPouNavView::mouseReleaseEvent(QMouseEvent *event)
{
    m_mouseDown = false;

    event->accept();
}


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


/// <summary>
/// 绘制预览窗口边框
/// </summary>
/// <param name="event"></param>
void WindowAppPouNavView::paintEvent(QPaintEvent *event)
{
    QGraphicsView::paintEvent(event);
 
     QPainter painter(viewport());
     painter.setPen(QPen(Qt::gray, 1));
     painter.drawRect(m_viewportRegion.boundingRect());
}