1.运行效果

实现功能：

1.可拖动。

2.可显示，可隐藏 。

3.悬浮在主界面上面。

4.目前只是一个简单的界面，什么功能都没有。

2.ui界面

3.源码

//FloatingWindow.h

#ifndef FLOATINGWINDOW_H

#define FLOATINGWINDOW_H

#include

#include

#include

namespace Ui {

class FloatingWindow;

}

class FloatingWindow : public QWidget

{

Q_OBJECT

public:

explicit FloatingWindow(QWidget *parent = 0);

~FloatingWindow();

private:

Ui::FloatingWindow *ui;

protected:

//事件过滤

bool eventFilter(QObject *watched, QEvent *event);

private:

QPropertyAnimation *m_pAnimation;

bool m_bDragFlag;

QPoint m_pointDrag;

};

#endif // FLOATINGWINDOW_H

//FloatingWindow.cpp

#include "FloatingWindow.h"

#include "ui_FloatingWindow.h"

#include

FloatingWindow::FloatingWindow(QWidget *parent) :

QWidget(parent),

ui(new Ui::FloatingWindow),

m_pAnimation(nullptr),

m_bDragFlag(false)

{

ui->setupUi(this);

setWindowFlags(Qt::FramelessWindowHint | Qt::SubWindow | Qt::WindowStaysOnTopHint);

ui->btnQQ->installEventFilter(this);

ui->widget->installEventFilter(this);

ui->widget->hide();

setAutoFillBackground(false);

setAttribute(Qt::WA_TranslucentBackground);

ui->frame->setStyleSheet("background:transparent;");

}

FloatingWindow::~FloatingWindow()

{

delete ui;

}

bool FloatingWindow::eventFilter(QObject *target, QEvent *event)

{

QMouseEvent *mouse = dynamic_cast(event);

if (target == ui->btnQQ)

{

if (event->type() == QEvent::Enter)

{

ui->widget->show();

}

if (event->type() == QEvent::Leave)

{

ui->widget->hide();

}

}

//拖动

if (mouse)

{

if (mouse->button() == Qt::LeftButton && mouse->type() == QEvent::MouseButtonPress)

{

m_bDragFlag = true;

if (target == ui->btnQQ)

{

m_pointDrag = ui->frame->mapToParent(ui->btnQQ->mapToParent(mouse->pos()));

ui->widget->hide();

}

}

else if (mouse->type() == QEvent::MouseButtonRelease)

{

m_bDragFlag = false;

}

else if (m_bDragFlag && mouse->type() == QEvent::MouseMove)

{

this->move(mouse->globalPos() - m_pointDrag);

}

}

return QWidget::eventFilter(target, event);

}

4.完整代码