#ifndef WEAKHINTUTILITY_H
#define WEAKHINTUTILITY_H

#include <QDateTime>
#include <QObject>
#include <QTimer>
#include <QVariantAnimation>
#include <QPropertyAnimation>
#include <QWidget>

class GlobalMsgWidget : public QWidget
{
    Q_OBJECT
public:
    enum HintMode
    {
        Success = 0,
        Warn = 1,
        Normal = 2,
        Error = 3,
    };
public:
    explicit GlobalMsgWidget(const QString &msg, HintMode mode, QWidget *parent = nullptr);
    ~GlobalMsgWidget() override{}
private:
    HintMode m_mode;
    QString m_strMsg;
//    int m_nYPos;
    QDateTime m_dtStart;                    //弱提示出现的时间(鼠标移入将不断刷新该时间为当前时间)
    QVariantAnimation m_animFlyInOut;       //飞入飞出动画
    QPropertyAnimation m_animPos;           //控制位置的动画
    QTimer m_timerCheckIfStay;
private:
    QColor GetBGColor(HintMode mode, int alpha = 255);
    QColor GetTextColor(HintMode mode, int alpha = 255);
    QString GetIconPath(HintMode mode);
protected:
    virtual void paintEvent(QPaintEvent *) override;
private slots:
    void CheckIfStay();
signals:
    void sig_Hide(GlobalMsgWidget *pWeakHint);
};

class GlobalMsgMgr : public QObject
{
    Q_OBJECT
public:
    static GlobalMsgMgr* Instance(){return sm_pInstance;}
    ~GlobalMsgMgr(){sm_pInstance = nullptr;}
    void SetRootWidget(QWidget *rootWidget);
    QWidget* GetRootWidget(){return m_pRootWidget;}
    void Popup(const QString &msg, GlobalMsgWidget::HintMode mode = GlobalMsgWidget::Normal);

    //begin:指定弹出窗口为父窗口,父窗口释放前需要Clear
    void Popup(const QString &msg, QWidget *parentWidget, GlobalMsgWidget::HintMode mode = GlobalMsgWidget::Normal);
    void Clear(QWidget *parentWidget);
    //end
private:
    GlobalMsgMgr(QObject *parent = nullptr);
    //防拷贝, C++11
    GlobalMsgMgr(GlobalMsgMgr const&) = delete;
	GlobalMsgMgr& operator=(GlobalMsgMgr const&) = delete;
    
private:
    static GlobalMsgMgr* sm_pInstance;     //单例实例
    static const int skm_nMaxCount = 8;
    QWidget *m_pRootWidget;
    QList<GlobalMsgWidget*> m_listWeakHints;
    QTimer m_timerUpdate;
private slots:
    void OnWeakHintHide(GlobalMsgWidget *pWeakHint);
    void OnUpdate();
private:
    /*----------------------------------------------------------------
     * 关于释放全局单例: 
     * 一个妥善的方法是让这个类自己知道在合适的时候把自己删除; 或者说把删除自己的操作挂在系统中的某个合适的点上, 使其在恰当的时候自动被执行;
     * 程序在结束的时候, 系统会自动析构所有的全局变量;事实上, 系统也会析构所有的类的静态成员变量, 就像这些静态成员也是全局变量一样;
     * 利用这个特征, 我们可以在单例类中定义一个这样的静态成员变量, 而它的唯一工作就是在析构函数中删除单例类的实例;
    ----------------------------------------------------------------*/
    class GlobalMsgMgrGarbo
    {
    public:
        ~GlobalMsgMgrGarbo()
        {  
            if(GlobalMsgMgr::sm_pInstance != nullptr)
                delete GlobalMsgMgr::sm_pInstance;
        }
    };
    static GlobalMsgMgrGarbo garbo;
    /*----------------------------------------------------------------*/
};

#endif // WEAKHINTUTILITY_H