本文实例为大家分享了Qt实现可拖动按钮的具体代码，供大家参考，具体内容如下

直接上代码

self-contained.h

#ifndef SELFCONTAINED_H#define SELFCONTAINED_H#include <QWidget>#include <QPainter>#include <QTimer>#include <QImage>#include <QMouseEvent>#include <QVector>#endif // SELFCONTAINED_H

按钮控件

drawbutton.h：

#ifndef DRAGBUTTON_H#define DRAGBUTTON_H#include "self-contained.h"class DragButton : public QWidget{ Q_OBJECTpublic: DragButton(QWidget *parent = 0); void setInitialScaling(double scaling); void setPixmap(QString pixmap); void setText(QString str); void setIsHold(bool flag);protected: int isPress; int isHold; QTimer *m_aniTimer; QTimer *m_holdTimer; double m_scaling; double m_InitialScaling;//当前缩放比例 QPoint m_mouseSrcPos;//最小缩放比例 QPixmap m_pixmap; QString m_text; void paintEvent(QPaintEvent *); void enterEvent(QEvent *); void leaveEvent(QEvent *); void mousePressEvent(QMouseEvent *); void mouseReleaseEvent(QMouseEvent *); void mouseMoveEvent(QMouseEvent *);signals: void release_signal(); void drag_signal();//拖动时发出信号 void clicked();public slots: void zoomIn();//放大 void zoomOut();//缩小 void hold_slot();};#endif // DRAGBUTTON_H

drawbutton.cpp

#include "dragbutton.h"DragButton::DragButton(QWidget *parent) : QWidget(parent),isPress(0),isHold(0),m_scaling(0.5),m_InitialScaling(0.5),m_mouseSrcPos(0,0){ m_aniTimer = new QTimer(this); m_aniTimer->setInterval(7); m_holdTimer = new QTimer(this); m_holdTimer->setInterval(1000); m_holdTimer->setSingleShot(true); connect(m_holdTimer,SIGNAL(timeout()),this,SLOT(hold_slot()));}void DragButton::setInitialScaling(double scaling){ if(scaling <= 1 && scaling > 0) { m_InitialScaling = scaling; m_scaling = scaling; }}void DragButton::setPixmap(QString pixmap){ m_pixmap.load(pixmap); update();}void DragButton::setText(QString str){ m_text = str; update();}void DragButton::setIsHold(bool flag){ isHold = flag; update();}void DragButton::paintEvent(QPaintEvent *){ if(m_pixmap.isNull()) return; QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing); if(isPress) { painter.setPen(Qt::NoPen); painter.setBrush(QColor(0,0,0,130)); painter.drawRoundedRect(rect(),20,20); } m_pixmap = m_pixmap.scaled(width(),height() - 20,Qt::KeepAspectRatio,Qt::SmoothTransformation); int w = m_pixmap.width()*m_scaling; int h = m_pixmap.height()*m_scaling; painter.drawPixmap(QRect((width() - w)/2,(height() - h)/2 - 20,w,h), m_pixmap,m_pixmap.rect()); painter.setPen(QColor(0,0,0)); painter.drawText(QRect(0,height() - 40,width(),40),Qt::AlignCenter,m_text);}void DragButton::enterEvent(QEvent *){ disconnect(m_aniTimer,SIGNAL(timeout()),this,SLOT(zoomOut())); connect(m_aniTimer,SIGNAL(timeout()),this,SLOT(zoomIn())); m_aniTimer->start();}void DragButton::leaveEvent(QEvent *){ disconnect(m_aniTimer,SIGNAL(timeout()),this,SLOT(zoomIn())); connect(m_aniTimer,SIGNAL(timeout()),this,SLOT(zoomOut())); m_aniTimer->start();}void DragButton::mousePressEvent(QMouseEvent *e){ if(!isHold) isPress = 1; m_holdTimer->start(); m_mouseSrcPos = e->pos(); update();}void DragButton::mouseReleaseEvent(QMouseEvent *e){ m_holdTimer->stop(); isPress = 0; isHold = 0; if(rect().contains(e->pos())) emit clicked(); emit release_signal(); update();}void DragButton::mouseMoveEvent(QMouseEvent *e){ if(isHold) { move(pos() - m_mouseSrcPos + e->pos()); emit drag_signal(); } else m_mouseSrcPos = e->pos();}void DragButton::zoomIn(){ m_scaling += 0.01; if(m_scaling >= 1) { m_scaling = 1; m_aniTimer->stop(); } update();}void DragButton::zoomOut(){ m_scaling -= 0.01; if(m_scaling <= m_InitialScaling) { m_scaling = m_InitialScaling; m_aniTimer->stop(); } update();}void DragButton::hold_slot(){ isHold = 1; isPress = 0; m_aniTimer->stop(); m_scaling = m_InitialScaling; update();}

整合按钮的控件

drawwidget.h

#include "dragbutton.h"class DragWidget : public QWidget{ Q_OBJECTpublic: DragWidget(QWidget *parent = 0); ~DragWidget(); void addButton(DragButton*);protected: QVector<DragButton*> BtnVector; QPoint m_mouseSrcPos;//记录坐标点 void resetInterface();//复位signals:public slots: void BtnMove_slots(); void BtnRelease_slots();};#endif // DRAGWIDGET_H

drawwidget.cpp

#include "dragwidget.h"DragWidget::DragWidget(QWidget *parent) : QWidget(parent),m_mouseSrcPos(0,0){}DragWidget::~DragWidget(){}void DragWidget::addButton(DragButton* btn){ connect(btn,SIGNAL(drag_signal()),this,SLOT(BtnMove_slots())); connect(btn,SIGNAL(release_signal()),this,SLOT(BtnRelease_slots())); BtnVector.push_back(btn); btn->show(); resetInterface();}void DragWidget::resetInterface(){ for(int i = 0;i < BtnVector.length();++i) { BtnVector[i]->setGeometry(i * width()/BtnVector.length(),0,width()/BtnVector.length(),height()); }}void DragWidget::BtnMove_slots(){ for(int i = 0;i < BtnVector.length();++i)//找到鼠标所在的按钮 if(BtnVector[i] == sender()) { int flag = (BtnVector[i]->pos().x() + BtnVector[i]->width()/2)/(width()/BtnVector.length()); for(int l = 0;l < BtnVector.length();++l)//这里也可以做动画，但这次主要实现拖动的功能 { if(l < i && l <flag) BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height()); else if((l > i && l <= flag)||(l >= flag && l < i)) BtnVector[l]->setGeometry((l + ((i-flag)>0?1:-1))* width()/BtnVector.length(),0,width()/BtnVector.length(),height()); else if(l > flag && l > i) BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height()); } //注释部分合为上面的循环// if(flag >= i)//往后拖// for(int l = 0;l < BtnVector.length();++l)// {// if(l < i)// BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height());// else if(l > i && l <= flag)// BtnVector[l]->setGeometry((l - 1)* width()/BtnVector.length(),0,width()/BtnVector.length(),height());// else if(l > flag)// BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height());// }// else if(flag < i)//往前拖// for(int l = 0;l < BtnVector.length();++l)// {// if(l < flag)// BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height());// else if(l >= flag && l < i)// BtnVector[l]->setGeometry((l + 1)* width()/BtnVector.length(),0,width()/BtnVector.length(),height());// else if(l > i)// BtnVector[l]->setGeometry(l * width()/BtnVector.length(),0,width()/BtnVector.length(),height());// } break; }}void DragWidget::BtnRelease_slots(){ for(int i = 0;i < BtnVector.length();++i)//找到鼠标所在的按钮 if(BtnVector[i] == sender()) { int posX = BtnVector[i]->pos().x(); if(posX < 0) posX = 0; else if(posX > width()) posX = width(); int flag = (posX+BtnVector[i]->width()/2)/(width()/BtnVector.length()); DragButton *btn = BtnVector[i];//修改vector顺序 if(flag >= i) for(int l = i;l < flag;++l) BtnVector[l] = BtnVector[l+1]; else for(int l = i;l > flag;--l) BtnVector[l] = BtnVector[l-1]; BtnVector[flag] = btn; } resetInterface();//复位}

使用

main.cpp

#include "dragwidget.h"#include <QApplication>int main(int argc, char *argv[]){ QApplication a(argc, argv); DragWidget ww; ww.setGeometry(200,200,800,200); DragButton w(&ww); w.setPixmap(":/image/image/contacts.png"); w.setText("按钮1"); w.setInitialScaling(0.6); DragButton w2(&ww); w2.setPixmap(":/image/image/time.png"); w2.setText("按钮2"); w2.setInitialScaling(0.6); DragButton w3(&ww); w3.setPixmap(":/image/image/checking.png"); w3.setText("按钮3"); w3.setInitialScaling(0.6); DragButton w4(&ww); w4.setPixmap(":/image/image/suitcase.png"); w4.setText("按钮4"); w4.setInitialScaling(0.6); ww.addButton(&w); ww.addButton(&w2); ww.addButton(&w3); ww.addButton(&w4); ww.show(); return a.exec();}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。