#pragma once
#include "global.h"

// https://blog.csdn.net/MrHHHHHH/article/details/134182253
class Input : public QLineEdit {
public:
    explicit Input(QWidget* parent = nullptr) : QLineEdit(parent) {
        setStyle(new Style());
        setFrame(true);
        // 当光标的位置在文本编辑器中改变时，这个信号会被触发。old和new参数分别表示光标改变前后的位置。
        connect(this, &QLineEdit::cursorPositionChanged, this, [=](int nOld, int nNew){
            //qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "nOld :" << nOld << "nNew :" << nNew;
        });
        // 当用户完成文本编辑（例如按下Enter键或点击其他区域使编辑结束）时，这个信号会被触发。
        connect(this, &QLineEdit::editingFinished, this, [=](){
            //qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "text :" << this->text();
        });
        // 当用户在文本编辑器中按下Enter键时，这个信号会被触发。
        connect(this, &QLineEdit::returnPressed, this,  [=](){
            //qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "text :" << this->text();
        });
        // 当文本编辑器中的选区发生变化时，这个信号会被触发。例如，当用户选择或取消选择文本时。
        connect(this, &QLineEdit::selectionChanged, this,  [=](){
            //qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "text :" << this->text();
        });
        // 当文本编辑器中的文本发生更改时，这个信号会被触发。参数text是改变后的文本内容。
        connect(this, &QLineEdit::textChanged, this,  [=](const QString& text){
           // qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "text :" << text;
        });
        // 当文本编辑器开始编辑新的文本时，这个信号会被触发。参数text是当前编辑的文本内容。
        connect(this, &QLineEdit::textEdited, this,  [=](const QString& text){
            //qDebug().noquote() << "[" << __FILE__ << __LINE__ << "]" << "text :" << text;
        });
        // update();
    }
    QString unit = "MHZ";
    QFont font;
    QPen pen;
    QColor focus_color = Qt::red;
    QColor default_color = Qt::black;
protected:
    void paintEvent(QPaintEvent* event) override {
        QLineEdit::paintEvent(event); // 调用原始绘制
        auto fm = QFontMetrics(font);
        QPainter painter(this);
        painter.setRenderHint(QPainter::Antialiasing, true);
        int w = width();
        int h = height();
        int pen_w = 1;
        if (QApplication::focusWidget() == this)
        {
            painter.setPen(QPen(focus_color, pen_w));
        } else
        {
            painter.setPen(QPen(default_color, pen_w));
        }
        painter.drawRoundedRect(rect(), h/4, h/4);
        painter.setPen(pen);
        painter.setFont(font);
        int unitWidth = fm.horizontalAdvance(unit);
        int th = fm.height();
        int x = rect().right() - unitWidth - 5; // 计算单位的绘制位置
        painter.drawText(x, height() / 2 + th / 2, unit);
        setTextMargins(0, 0, unitWidth + 4, 0); // 右边留出单位的空间
    }
    class Style : public QProxyStyle {
    public:
        void drawPrimitive(QStyle::PrimitiveElement element, const QStyleOption* option, QPainter* painter,
                           const QWidget* widget) const override {
            // 先调用默认的绘制
            auto t = qobject_cast<const QLineEdit*>(widget);
            if (!t) return;
            static bool it = true;
            // QProxyStyle::drawPrimitive(element, option, painter, widget);
            // qDebug() << "t->hasFrame() == " << t->hasFrame();
            if (it)
            {
                // QProxyStyle::drawPrimitive(element, option, painter, widget);
                it = false;
            }
            // 行编辑器边框
            if (element == PE_PanelLineEdit)
            {
                //
            }
            // 行编辑器边框
            if (element == PE_FrameLineEdit)
            {
//                qDebug() << "lineEdit  drawPrimitive " << element;
//                qDebug() << "width " << option->rect.width();
            }
        }
        void drawComplexControl(ComplexControl control, const QStyleOptionComplex* option, QPainter* painter,
                                const QWidget* widget) const override {
            // auto t = qobject_cast<const QLineEdit*>(widget);
            // if (!t) return;
            // qDebug() << "lineEdit  drawComplexControl " << control;
            // QProxyStyle::drawComplexControl(control, option, painter, widget);
        }
        void drawControl(ControlElement element, const QStyleOption* option, QPainter* painter,
                         const QWidget* widget) const override {
            // auto t = qobject_cast<const QLineEdit*>(widget);
            // qDebug() << "lineEdit drawControl " << element;
            // QProxyStyle::drawControl(element, option, painter, widget);
            // if (!t) return;
        }
        // void drawItemText(QPainter* painter, const QRect& rect, int flags, const QPalette& pal, bool enabled,
        //                   const QString& text, QPalette::ColorRole textRole) const override {
        //
        //
        // }
        // void drawItemPixmap(QPainter* painter, const QRect& rect, int alignment, const QPixmap& pixmap) const
        // override {
        //
        // }
        QRect subElementRect(SubElement element, const QStyleOption* option, const QWidget* widget) const override {
            auto t = qobject_cast<const QLineEdit*>(widget);
            if (!t)
            {
                return QProxyStyle::subElementRect(element, option, widget);
            }
            // qDebug() << "lineEdit subElementRect " << element;
            // 这里可以自定义返回不同的 QRect 以控制子元素的大小或位置
            if (element == SE_LineEditContents)
            {
                QRect rect = QProxyStyle::subElementRect(element, option, widget);
                // rect.adjust(5, 5, -5, -5);  // 例如，让文本内容区域缩小一点
                return rect;
            }
            return QProxyStyle::subElementRect(element, option, widget);
        }
    };
};