#pragma once

#include <QWidget>
#include "ui_ShowImgWidget.h"
#include "RDS_Image_Define.h"
#include <memory>
class ShowImgWidget : public QWidget
{
    Q_OBJECT

public:
    ShowImgWidget(QWidget *parent = Q_NULLPTR);
    ~ShowImgWidget();

    void SetImgSrc(std::shared_ptr<RDS_Image> iImgSrc);
    void SetImgSrc(const QImage& Src);

protected:
    void ImgCounter();        //進行顯示圖片擷取
    void RectAdjust();        //進行擷取矩形
    void paintEvent(QPaintEvent *event) Q_DECL_OVERRIDE;
    void resizeEvent(QResizeEvent *event) Q_DECL_OVERRIDE;
    //滾輪縮放
    void wheelEvent(QWheelEvent *event) Q_DECL_OVERRIDE;
    void mousePressEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void mouseReleaseEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
    void mouseMoveEvent(QMouseEvent *event) Q_DECL_OVERRIDE;
private:
    bool b_ScaleLock,bTranLock;

    QImage mImgSrc,mImgOnShow;
    
    QBrush mBrush;
    QRect imgRect;

    double mScale;
    QPoint mouseLastPos;

    Ui::ShowImgWidget ui;
};
 

#include "ShowImgWidget.h"

ShowImgWidget::ShowImgWidget(QWidget *parent)
    : QWidget(parent)
{
    ui.setupUi(this);
    
    mScale = 1.0;

}

ShowImgWidget::~ShowImgWidget()
{
}
void ShowImgWidget::SetImgSrc(std::shared_ptr<RDS_Image> iImgSrc){
    if (iImgSrc){
        this->mImgSrc = iImgSrc->toQImage();
        this->imgRect = QRect(0, 0, mImgSrc.width(), mImgSrc.height());
        ImgCounter();    //進行視口匹配裁剪
    }
    return;
}

void ShowImgWidget::ImgCounter(){
    this->mImgOnShow = mImgSrc.copy(this->imgRect).scaled(this->size(),
        Qt::KeepAspectRatio, Qt::SmoothTransformation);

    return;
}

void ShowImgWidget::RectAdjust(){
    this->imgRect.setX(qMax(0.0, qMin(qreal(this->imgRect.x()), mImgSrc.width() - mImgSrc.width() / this->mScale)));
    this->imgRect.setY(qMax(0.0, qMin(qreal(this->imgRect.y()), mImgSrc.height() - mImgSrc.height() / this->mScale)));
    this->imgRect.setWidth( mImgSrc.width() / this->mScale);
    this->imgRect.setHeight(mImgSrc.height() / this->mScale);
    return;
}

void ShowImgWidget::SetImgSrc(const QImage& Src){
    this->mImgSrc = Src;
    ImgCounter();    //進行視口匹配裁剪
}

#include "qpainter.h"
void ShowImgWidget::paintEvent(QPaintEvent *event) {
    QPainter painterTemp(this);
    painterTemp.setRenderHint(QPainter::Antialiasing, true);
    painterTemp.setRenderHint(QPainter::SmoothPixmapTransform,true );

    QPointF center(this->mImgOnShow.width() / qreal(2), this->mImgOnShow.height() / qreal(2));
    //painterTemp.translate(ctrlPoints.at(0) - center);

    //painterTemp.translate(center);
    //painterTemp.translate(-center);

    painterTemp.drawImage(QPointF(0, 0), this->mImgOnShow);
    return;
}
void ShowImgWidget::resizeEvent(QResizeEvent *event){
    RectAdjust();
    ImgCounter();
    return;
}
#include "qevent.h"
//滾輪縮放
void ShowImgWidget::wheelEvent(QWheelEvent *e){
    mScale += e->delta() / qreal(1000);
    //最大比例為圖片畫素與 視窗畫素 1:1
    mScale = qMax(qreal(1), qMin(qreal(mImgSrc.width()/this->width()), mScale));
    RectAdjust();
    ImgCounter();
    this->update();
    return;
}

void ShowImgWidget:: mousePressEvent(QMouseEvent *event) {
    qDebug("MP");
    if (event->button() == Qt::LeftButton){        //進入位移模式 
        bTranLock = true;
        mouseLastPos = event->pos();
    }
    else if (event->button() == Qt::RightButton){        //復位
        mouseLastPos = QPoint(0, 0); 
        mScale = 1;
        bTranLock = false;
        this->imgRect = QRect(0, 0, mImgSrc.width() / this->mScale, mImgSrc.height() / this->mScale);
        RectAdjust();
        ImgCounter();
    }

    return;
}
void ShowImgWidget::mouseReleaseEvent(QMouseEvent *event){
    qDebug("MR");
    bTranLock = false;
    RectAdjust();
    ImgCounter();
    this->update();
    return;
}

void ShowImgWidget::mouseMoveEvent(QMouseEvent *event){
    if (this->bTranLock){        //如果在位移模式之中 
        auto PP = this->mouseLastPos - event->pos();
    
        imgRect.setX(imgRect.x() + PP.x());
        imgRect.setY(imgRect.y() + PP.y());

        this->imgRect = QRect(imgRect.x(), imgRect.y(), 
            mImgSrc.width() / this->mScale, mImgSrc.height() / this->mScale);

        RectAdjust();
        ImgCounter();
        this->update();
        this->mouseLastPos = event->pos();
    }
    else {

    }
    return;
}