/**
     *\brief 自定义边框容器类，可以挂载给任意采用无系统边框的widget上，进而实现widget的缩放、移动等功能
     *
     *\author dsc
     */
#ifndef CUSTOMBORDERCONTAINER_H
#define CUSTOMBORDERCONTAINER_H

#include <QWidget>
#include <QObject>
#include <QLabel>
#include <QMouseEvent>
#include <QBasicTimer>

class CustomBorderContainer : public QObject
{
    Q_OBJECT

public:
    enum borderType
    {
        border_left = 0,
        border_right,
        border_top,
        border_bottom,
        border_leftTop,
        border_leftBottom,
        border_rightTop,
        border_rightBottom,
        border_move
    };

    enum OperationOption
    {
        NoOperation = 0,      // 二进制: 0b0000
        Movable = 1 << 0, // 二进制: 0b0001
        Resizable = 1 << 1, // 二进制: 0b0010
        DefaultOperation = Movable | Resizable
    };
    //创建 QFlags 包装类型
    Q_DECLARE_FLAGS(OperationOptions, OperationOption)

    explicit CustomBorderContainer(QWidget* parent, QSize minimumSize = QSize(50, 50), int borderSize = 3);
    ~CustomBorderContainer();

    void setMinimumWindowSize(QSize);
    void setBorderSize(int);
    void setOperationOptions(OperationOptions);
    void updateBorder();
    void updateContentWidget();

private:
    //内部类
    class Border : public QLabel
    {
    public:
        explicit Border(QWidget* parent, borderType type, CustomBorderContainer* container);

    protected:
        void mousePressEvent(QMouseEvent*);
        void mouseMoveEvent(QMouseEvent*);
        void mouseReleaseEvent(QMouseEvent*);
        void timerEvent(QTimerEvent*);

    private:
        borderType m_type;
        QPoint m_mouseLastPoint;
        QPoint m_mouseMoveLength;
        bool m_mouseIsPressed;
        CustomBorderContainer* m_contaniner;
        QBasicTimer m_repaintTimer;
    };

    void initializeBorder();
    void scaleByCustomBorder(borderType, const QPoint&);

    QWidget* m_contentWidget;
    QSize m_minimumSize;
    int m_borderSize;
    //borders
    Border* m_borderLeft;
    Border* m_borderRight;
    Border* m_borderTop;
    Border* m_borderBottom;
    Border* m_borderLeftTop;
    Border* m_borderLeftBottom;
    Border* m_borderRightTop;
    Border* m_borderRightBottom;
    Border* m_borderMove; //用于移动的border
    OperationOptions m_operationOptions;
};

//生成运算符重载(不能放在类的内部)
Q_DECLARE_OPERATORS_FOR_FLAGS(CustomBorderContainer::OperationOptions)

#endif //CUSTOMBORDERCONTAINER_H