自定义控件音量控制按钮

#ifndef CVOLUMESLIDERDIALOG_H
#define CVOLUMESLIDERDIALOG_H

#include 
#include 

class CVolumeSliderDialog : public QDialog
{
	Q_OBJECT

public:
	CVolumeSliderDialog(QWidget *parent = Q_NULLPTR);
	~CVolumeSliderDialog();

	void setSliderValue(int value)
	{
		m_pSlider->setValue(value);
	}

protected:
	bool event(QEvent* event) override;

signals:
	void sig_SliderValueChanged(int value);

private:
	QSlider* m_pSlider = nullptr;
};

#endif

#include "CVolumeSliderDialog.h"
#include 
#include 
#include 


//注意由于此类使用了windows的函数SetClassLong，需要包含user32.lib
//如果是在vs2019中使用则不需要包含user32.lib
#pragma comment(lib, "user32.lib")

CVolumeSliderDialog::CVolumeSliderDialog(QWidget* parent)
	: QDialog(parent)
{
	this->setFixedSize(40, 200);
	QVBoxLayout* pVLay = new QVBoxLayout(this);
	m_pSlider = new QSlider(this);
	m_pSlider->setOrientation(Qt::Vertical);
	pVLay->addWidget(m_pSlider);

	setFixedSize(40, 120);
    setWindowFlags(Qt::FramelessWindowHint | Qt::ToolTip);   //ToolTip : 悬浮是显示，离开时消失
    setStyleSheet("QDialog{background-color: rgba(54, 54, 54, 0.5);}");  //0.5表示透明度，0表示全透明、1表示不透明；也可以使用百分百表示如： frm->setStyleSheet(“QFrame{background-color: rgba(255, 0, 0, 50%);}”);

	connect(m_pSlider, &QSlider::valueChanged, [=](int value) {
		emit sig_SliderValueChanged(value);
		});
}

CVolumeSliderDialog::~CVolumeSliderDialog()
{
}

//参考qt文档:bool QWidget::event(QEvent *event)
//设置popup后，dialog有窗口阴影，需要去除就重写event函数
bool CVolumeSliderDialog::event(QEvent* event)
{
    static bool class_amended = false;

    if (event->type() == QEvent::WinIdChange)
    {
        HWND hwnd = (HWND)winId();

        if (class_amended == false)
        {
            class_amended = true;
            DWORD class_style = ::GetClassLong(hwnd, GCL_STYLE);
            class_style &= ~CS_DROPSHADOW;
            ::SetClassLong(hwnd, GCL_STYLE, class_style); // windows系统函数
        }
    }

	return QWidget::event(event);
}

/*

音量调节按钮

功能：
	1. 鼠标悬浮到音量时显示slider dialog
	2. 点击时mute

注意问题：
	重写按钮类，样式表无效
*/

#pragma once

#include 
#include "CVolumeSliderDialog.h"


class CVolumeButton : public QPushButton
{
	Q_OBJECT

public:
    CVolumeButton(QWidget* parent = nullptr);
	~CVolumeButton();

	bool getMute() const
	{
		return m_isMute;
	}

	void setMute(bool mute) { m_isMute = mute; }

signals:
	void sig_VolumeValue(int value);

protected:
	void paintEvent(QPaintEvent* event) override;
	void enterEvent(QEvent* event) override;
	//void leaveEvent(QEvent* event) override;
	void mousePressEvent(QMouseEvent* event) override;
	void timerEvent(QTimerEvent* event) override;

private:
	bool m_isMute = false;  //是否静音
	CVolumeSliderDialog* m_pVolumeSliderDlg = nullptr;

    int m_timerId = -1;
};

#include "CVolumeButton.h"
#include 
#include 
#include 
#include 
#include 

using namespace std;

CVolumeButton::CVolumeButton(QWidget* parent)
	: QPushButton(parent)
{
    this->setFixedSize(32,32);

    setStyleSheet("QPushButton{background-image:url(:/resources/audio_open.svg);border:none;}"
        "QPushButton:hover{background-image:url(:/resources/audio_open_hover.svg);border:none;}"
        "QPushButton:pressed{background-image:url(:/resources/audio_open.svg);border:none;}");
}

CVolumeButton::~CVolumeButton()
{
}

void CVolumeButton::paintEvent(QPaintEvent*)
{
	QStylePainter p(this);
	QStyleOptionButton option;
	initStyleOption(&option);
	p.drawControl(QStyle::CE_PushButton, option);
}

void CVolumeButton::enterEvent(QEvent* event)
{
	if (!m_pVolumeSliderDlg)
        m_pVolumeSliderDlg = new CVolumeSliderDialog(this);

	QPoint p1 = this->mapToGlobal(QPoint(0, 0));  //声音按钮左上角相对于桌面的绝对位置
	QRect rect1 = this->rect();
	QRect rect2 = m_pVolumeSliderDlg->rect();     //rect包含标题栏，去掉标题栏后height不变

	int x = p1.x() + (rect1.width() - rect2.width()) / 2;
	int y = p1.y() - rect2.height() - 5;
	m_pVolumeSliderDlg->move(x, y);   //move是相对于桌面原点的位置

	m_pVolumeSlider服务器托管网Dlg->show();
    m_timerId = startTimer(250);

	connect(m_pVolumeSliderDlg, &CVolumeSliderDialog::sig_SliderValueChanged, [=](int value) {
		emit sig_VolumeValue(value);
		});
}


//void CVolumeButton::leaveEvent(QEvent* event)
//{
//	根据鼠标的位置判断音量调节窗口是否消失
//	//QPoint p1 = QCursor::pos();   //绝对位置
//
//	//cout rect();  //按钮矩形
//	//	QRect rect2 = m_pVolumeSliderDlg->rect();
//	//	QRect rect3 = m_pVolumeSliderDlg->geometry();
//
//	//	QPoint p2 = this->mapToGlobal(QPoint(0, 0));   //声音按钮左上角相对于桌面的绝对位置
//
服务器托管网//	//	//已知：音量框宽40 > 按钮宽30
//	//	QRect area(rect3.left(), rect3.top(), rect2.width(), p2.y() + rect1.height() - rect3.top()); //左上宽高
//
//	//	cout hide();
//	//	}
//	//}
//}

void CVolumeButton::mousePressEvent(QMouseEvent* event)
{
	if (event->button() == Qt::LeftButton)
	{
		m_isMute = !m_isMute;
		if (m_isMute)
		{
			if (m_pVolumeSliderDlg)
				m_pVolumeSliderDlg->setSliderValue(0);
		}
		else
		{
			if (m_pVolumeSliderDlg)
				m_pVolumeSliderDlg->setSliderValue(50);
		}
	}
}


/**
 * @brief 用定时器模拟leaveEvent，
 * 直接在leaveEvent里让m_pVolumeSliderDlg消失，效果不太好，
 * 用鼠标移动事件也不太好，定时器是比较好的做法
 */
void CVolumeButton::timerEvent(QTimerEvent* event)
{
	if ((m_pVolumeSliderDlg != nullptr) && (m_pVolumeSliderDlg->isVisible()))
	{
		QPoint p1 = QCursor::pos();   //鼠标绝对位置
		if (m_pVolumeSliderDlg)
		{
			QRect rect1 = this->rect();  //按钮矩形
			QRect rect2 = m_pVolumeSliderDlg->rect();
			QRect rect3 = m_pVolumeSliderDlg->geometry();

			QPoint p2 = this->mapToGlobal(QPoint(0, 0));   //声音按钮左上角相对于桌面的绝对位置

			//已知：音量框宽40 > 按钮宽30
			QRect area(rect3.left(), rect3.top(), rect2.width(), p2.y() + rect1.height() - rect3.top()); //左上宽高

			if (!area.contains(p1))
			{
				m_pVolumeSliderDlg->hide();
			}
		}
	}
	else
	{
        killTimer(m_timerId);
	}
}

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