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概述

使用Qt如何制作一个滑动开关按钮，同类的文章和代码网上很多，但很多都是pyqt编写的，也有c++编写的，大家可以参考. 我这里主要是实现了一个滑动按钮，富有滑动动画和文字，话不多说，上代码

c++/Qt实现

.h文件

#ifndef SwitchButtonInsideINSIDE_H
#define SwitchButtonInsideINSIDE_H#include <QWidget>#include "customcomponent_global.h"class Slider;class CUSTOMCOMPONENT_EXPORT SwitchButtonInside : public QWidget
{Q_OBJECTpublic:explicit SwitchButtonInside(QWidget *parent = nullptr);~SwitchButtonInside();/*** @brief SetSize 设置按钮的尺寸* @param nWidth 按钮的新宽度* @param nHeight 按钮的新高度*/void SetSize(int nWidth, int nHeight);/*** @brief SetActiveColor 设置按钮激活时候的颜色* @param color 激活颜色*/void SetActiveColor(const QColor& color);/*** @brief SetInactiveColor 设置按钮未激活时候的颜色* @param color 未激活颜色*/void SetInactiveColor(const QColor& color);/*** @brief SetSliderColor 设置滑块颜色* @param color 滑块的颜色*/void SetSliderColor(const QColor& color);/*** @brief SetStatus 设置按钮状态* @param bActive true: 激活，false: 未激活*/void SetStatus(bool bActive);/*** @brief GetStatus 获取按钮当前状态* @return  true: 激活，false: 未激活*/bool GetStatus() const;/*** @brief SetStatus 设置按钮显示文字* @param text: 文字内容*/void SetText(const QString &text);protected:void paintEvent(QPaintEvent *event) override;void mousePressEvent(QMouseEvent *event) override;void mouseReleaseEvent(QMouseEvent *event) override;void ToActive();void ToInactive();private:bool m_bActive; // 是否激活int m_nArcRadius; // 圆弧的半径int m_nRectWidth; // 矩形的宽度const short m_nMargin = 2;const int m_nDuration = 100; // 动画时间，单位毫秒bool m_bClicked; // 能否被点击。如果动画还没结束，无法进行点击/状态切换QColor m_colorActive; // 激活时的颜色QColor m_colorInactive;Slider* m_pSlider;QString m_text; // 显示文字signals:/*** @brief Clicked 按钮被点击后发出的信号* @param status 当前按钮状态。true为active，false为inactive*/void Clicked(bool status);
};class Slider : public QWidget
{Q_OBJECT
public:explicit Slider(QWidget* parent = nullptr);~Slider();/*** @brief SetSliderColor 设置滑块颜色* @param color*/void SetSliderColor(const QColor& color);protected:void paintEvent(QPaintEvent* e) override;private:QColor m_sliderColor;
};#endif // SwitchButtonInsideINSIDE_H

.cpp文件

#include "switchbuttoninside.h"
#include <QPainter>
#include <QFont>
#include <QPainterPath>
#include <QPropertyAnimation>SwitchButtonInside::SwitchButtonInside(QWidget *parent) :QWidget(parent)
{resize(72, 28); // 默认80，28宽高m_pSlider = new Slider(this);m_pSlider->resize(height() - m_nMargin * 2, height() - m_nMargin * 2);m_pSlider->move(m_nMargin, m_nMargin);m_bActive = false; // 默认未激活m_nArcRadius = std::min(width(), height()); // 默认半径m_nRectWidth = width() - m_nArcRadius;m_colorActive = qRgb(60, 189, 136);m_colorInactive = qRgb(167, 177, 188);
}SwitchButtonInside::~SwitchButtonInside()
{
}void SwitchButtonInside::SetSize(int nWidth, int nHeight)
{resize(nWidth, nHeight);m_pSlider->resize(height() - m_nMargin * 2, height() - m_nMargin * 2);m_pSlider->move(m_nMargin, m_nMargin);m_nArcRadius = std::min(width(), height());m_nRectWidth = width() - m_nArcRadius;
}void SwitchButtonInside::SetActiveColor(const QColor& color)
{m_colorActive = color;
}void SwitchButtonInside::SetInactiveColor(const QColor& color)
{m_colorInactive = color;
}void SwitchButtonInside::SetSliderColor(const QColor& color)
{m_pSlider->SetSliderColor(color);
}void SwitchButtonInside::SetStatus(bool bActive)
{if(m_bActive == bActive) {return;}m_bActive = bActive;if(m_bActive) {ToActive();} else {ToInactive();}
}bool SwitchButtonInside::GetStatus() const
{return m_bActive;
}void SwitchButtonInside::SetText(const QString &text)
{m_text = text;
}void SwitchButtonInside::paintEvent(QPaintEvent *)
{qDebug() << "[SwitchButtonInside]m_nArcRadius = " << m_nArcRadius<< "| m_nRectWidth << " << m_nRectWidth<< "| size = " << width() << "," << height();if (m_nArcRadius > height()) {qDebug() << "******* switchbutton resize ******";SetSize(width(), height());}QPainter p;p.begin(this);p.setRenderHint(QPainter::Antialiasing, true);p.setPen(Qt::NoPen);if(m_bActive) p.setBrush(QBrush(m_colorActive));else p.setBrush(QBrush(m_colorInactive));QPainterPath leftPath;leftPath.addEllipse(0, 0, m_nArcRadius, m_nArcRadius);QPainterPath middlePath;middlePath.addRect(m_nArcRadius / 2, 0, m_nRectWidth, m_nArcRadius);QPainterPath rightPath;rightPath.addEllipse(m_nRectWidth, 0, m_nArcRadius, m_nArcRadius);QPainterPath path = leftPath + middlePath + rightPath;p.drawPath(path);QPen pen;pen.setColor(Qt::white);p.setPen(pen);QFont ft;ft.setPointSize(9);p.setFont(ft);if (m_bActive) {p.drawText(QRect(0, 0, m_nRectWidth,m_nArcRadius), Qt::AlignCenter, m_text);} else {p.drawText(QRect(m_nArcRadius, 0,m_nRectWidth, m_nArcRadius), Qt::AlignCenter, m_text);}p.end();
}void SwitchButtonInside::mousePressEvent(QMouseEvent *event)
{QWidget::mousePressEvent(event);
}void SwitchButtonInside::mouseReleaseEvent(QMouseEvent *event)
{emit Clicked(!m_bActive);QWidget::mouseReleaseEvent(event);
}void SwitchButtonInside::ToActive()
{QPropertyAnimation* pAnimation = new QPropertyAnimation(m_pSlider, "geometry");pAnimation->setDuration(m_nDuration);pAnimation->setStartValue(m_pSlider->rect());pAnimation->setEndValue(QRect(width() - m_pSlider->width() - m_nMargin,m_nMargin,m_pSlider->width(),m_pSlider->height()));connect(pAnimation, &QPropertyAnimation::valueChanged, this, [&](const QVariant &value){Q_UNUSED(value)update();});pAnimation->start(QAbstractAnimation::DeleteWhenStopped);
}void SwitchButtonInside::ToInactive()
{QPropertyAnimation* pAnimation = new QPropertyAnimation(m_pSlider, "geometry");pAnimation->setDuration(m_nDuration);pAnimation->setStartValue(QRect(m_pSlider->x(),m_pSlider->y(),m_pSlider->width(),m_pSlider->height()));pAnimation->setEndValue(QRect(m_nMargin,m_nMargin,m_pSlider->width(),m_pSlider->height()));connect(pAnimation, &QPropertyAnimation::valueChanged, this, [&](const QVariant &value){Q_UNUSED(value)update();});pAnimation->start(QAbstractAnimation::DeleteWhenStopped);
}///
/// Slider  滑块类  //
//Slider::Slider(QWidget *parent) : QWidget(parent)
{m_sliderColor = Qt::white;resize(56, 56);
}Slider::~Slider()
{}void Slider::SetSliderColor(const QColor &color)
{m_sliderColor = color;update();
}void Slider::paintEvent(QPaintEvent *e)
{QPainter p(this);p.setRenderHints(QPainter::Antialiasing | QPainter::SmoothPixmapTransform);p.fillRect(rect(), Qt::transparent);p.setBrush(m_sliderColor);p.setPen(Qt::NoPen);p.drawRoundedRect(rect(), width() / 2, height() / 2);QWidget::paintEvent(e);
}