一、效果展示

二、源码分享

hoverToolboxWidget.h

#ifndef HOVERTOOLBOXWIDGET_H
#define HOVERTOOLBOXWIDGET_H

#include <QWidget>
#include <QMouseEvent>
#include <QPropertyAnimation>
#include <QStyleOption>
#include <QPainter>

namespace Ui {
class HoverToolboxWidget;
}

class HoverToolboxWidget : public QWidget
{
    Q_OBJECT
signals:
    void btnClickSlot(QString fun);
public:
    explicit HoverToolboxWidget(QWidget *parent = nullptr);
    ~HoverToolboxWidget();
protected:
    void paintEvent(QPaintEvent *event) override;
    bool eventFilter(QObject *obj,QEvent *event) override;
private:
    void controlInit();
    void extand();
private:
    Ui::HoverToolboxWidget *ui;
    bool isDragging = false,isExtending = false;
    QPointF dragPos;
    QPropertyAnimation *amplifyAnimation,*leaveAnimation;
    static const uint8_t cellSize = 75;
};

#endif // HOVERTOOLBOXWIDGET_H

hoverToolboxWidget.cpp

#include "hoverToolboxWidget.h"
#include "ui_hoverToolboxWidget.h"

HoverToolboxWidget::HoverToolboxWidget(QWidget *parent)
    : QWidget(parent)
    , ui(new Ui::HoverToolboxWidget)
{
    ui->setupUi(this);
    this->controlInit();
}

HoverToolboxWidget::~HoverToolboxWidget()
{
    delete ui;
}
void HoverToolboxWidget::controlInit()
{
    setWindowFlags(Qt::FramelessWindowHint | Qt::WindowStaysOnTopHint);
    setAttribute(Qt::WA_TranslucentBackground, true);

    this->ui->labelImage->installEventFilter(this);
    this->ui->labelImage->setMouseTracking(true);

    this->ui->frame->installEventFilter(this);
    this->ui->frame->setMouseTracking(true);

    this->ui->pushButton1->hide();
    this->ui->pushButton2->hide();
    this->ui->pushButton3->hide();
    this->ui->pushButton4->hide();
    this->ui->pushButton5->hide();
    this->ui->pushButton6->hide();
    this->ui->pushButton7->hide();
    this->ui->pushButton8->hide();
    this->resize(cellSize,cellSize);

    this->setAttribute(Qt::WA_StyledBackground, true);

    connect(this->ui->pushButton1,&QPushButton::clicked,this,
            [=]()
            {
                emit btnClickSlot("openRootDir");
            });
    connect(this->ui->pushButton1,&QPushButton::clicked,this,
            [=]()
            {
                emit btnClickSlot("screenShot");
            });
}

void HoverToolboxWidget::extand()
{
    if(!isExtending)
    {
        auto pos = this->pos();

        int x = pos.x()-cellSize-this->ui->frame->layout()->spacing();
        int y = pos.y()-cellSize-this->ui->frame->layout()->spacing();

        int wh = cellSize*3 + this->ui->frame->layout()->spacing()*2 + this->ui->labelImage->pos().x()*2;

        this->setGeometry(x,y,wh,wh);
        this->ui->pushButton1->show();
        this->ui->pushButton2->show();
        this->ui->pushButton3->show();
        this->ui->pushButton4->show();
        this->ui->pushButton5->show();
        this->ui->pushButton6->show();
        this->ui->pushButton7->show();
        this->ui->pushButton8->show();

        //判断有没有超出边界
        int jx = this->pos().x();
        int jy = this->pos().y();

        if(jx < 0)
            jx = 0;
        if(jx+this->width() > this->parentWidget()->width())
            jx = this->parentWidget()->width()-this->width();

        if(jy < 0)
            jy = 0;
        if(jy + this->height() > this->parentWidget()->height())
            jy = this->parentWidget()->height() - this->height();


        this->move(jx,jy);
        isExtending = true;

        this->ui->labelImage->setPixmap(QPixmap(":/image/image/toolboxOpen.svg"));
    }
}

void HoverToolboxWidget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);
    QStyleOption option;
    option.initFrom(this);
    QPainter painter(this);
    style()->drawPrimitive(QStyle::PE_Widget, &option, &painter, this);
}


bool HoverToolboxWidget::eventFilter(QObject *obj, QEvent *event)
{
    if(obj == this->ui->labelImage)
    {
        if(event->type() == QEvent::MouseButtonPress)
        {
            QMouseEvent *ev = dynamic_cast<QMouseEvent *>(event);
            if (ev->button() == Qt::LeftButton)
            {
                isDragging = true;
                dragPos = ev->globalPosition() - frameGeometry().topLeft();
            }
            if (ev->button() == Qt::RightButton)
            {
                this->extand();
            }
        }
        else if(event->type() == QEvent::MouseMove)
        {
            QMouseEvent *ev = dynamic_cast<QMouseEvent *>(event);
            if (isDragging)
            {
                QPointF movePoint = ev->globalPosition() - dragPos;
                int x = movePoint.x();
                int y = movePoint.y();
                if(x < 0)
                    x = 0;
                if((x+this->width()) > this->parentWidget()->width())
                    x = this->parentWidget()->width() - this->width();

                if(y < 0)
                    y = 0;
                if((y+this->height()) > this->parentWidget()->height())
                    y = this->parentWidget()->height() - this->height();

                this->move(x,y);
            }
        }
        else if(event->type() == QEvent::MouseButtonRelease)
        {
            QMouseEvent *ev = dynamic_cast<QMouseEvent *>(event);
            if (ev->button() == Qt::LeftButton) {
                isDragging = false;
            }
        }
        else if(event->type() == QEvent::MouseButtonDblClick)
        {
            this->extand();
        }
    }
    else if(obj == this->ui->frame)
    {
        if(event->type() == QEvent::Leave)
        {
            if(isExtending)
            {
                isExtending = false;
                auto pos = this->pos();

                this->ui->pushButton1->hide();
                this->ui->pushButton2->hide();
                this->ui->pushButton3->hide();
                this->ui->pushButton4->hide();
                this->ui->pushButton5->hide();
                this->ui->pushButton6->hide();
                this->ui->pushButton7->hide();
                this->ui->pushButton8->hide();

                int x = pos.x()+cellSize + this->ui->frame->layout()->spacing();
                int y = pos.y()+cellSize + this->ui->frame->layout()->spacing();

                this->setGeometry(x,y,cellSize,cellSize);

                this->ui->labelImage->setPixmap(QPixmap(":/image/image/toolboxClose.svg"));
            }
        }
    }

    return QWidget::eventFilter(obj,event);
}