使用QT实现自定义类卡牌控件Card，使其能在父类窗口上使用鼠标进行拖动。
控件类头文件card.h
#ifndef CARD_H #define CARD_H #include <QWidget> #include <QPaintEvent> #include <QPainter> #include <QMouseEvent> class Card:public QWidget { Q_OBJECT public: explicit Card(QWidget *parent = nullptr); ~Card(); protected: void paintEvent(QPaintEvent *event) override; void mousePressEvent(QMouseEvent *event) override; signals: void sendSelf(Card *w); }; #endif // CARD_H
控件类头文件card.cpp
#include "card.h" Card::Card(QWidget *parent):QWidget(parent) { this->setGeometry(0,0,200,400); //设置控件窗口大小 } Card::~Card() { } void Card::paintEvent(QPaintEvent *event) { QPainter painter(this); //创建画笔 painter.setRenderHint(QPainter::Antialiasing,true); QBrush brush; //创建笔刷 brush.setColor(Qt::yellow); //设置笔刷颜色 brush.setStyle(Qt::SolidPattern); painter.setBrush(brush); //设置画笔笔刷 painter.drawRoundedRect(QRectF(5,5,190,390),10,10); //绘制圆角矩形并填充 } void Card::mousePressEvent(QMouseEvent *event) { Q_UNUSED(event); emit sendSelf(this); //信号发送该控件地址 }
以上是基于widget类的控件类；
父窗口头文件mainwindow.h
#ifndef MAINWINDOW_H #define MAINWINDOW_H #include <QMainWindow> #include "card.h" #include <QDebug> namespace Ui { class MainWindow; } class MainWindow : public QMainWindow { Q_OBJECT public: explicit MainWindow(QWidget *parent = 0); ~MainWindow(); private: Ui::MainWindow *ui; Card* cd[8]; Card *temp; QPoint startP; QPoint yuanP; private slots: void getObject(Card *w); protected: void mouseMoveEvent(QMouseEvent *event) override; void mouseReleaseEvent(QMouseEvent *event) override; }; #endif // MAINWINDOW_H
父窗口头文件mainwindow.cpp
#include "mainwindow.h" #include "ui_mainwindow.h" MainWindow::MainWindow(QWidget *parent) : QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); for(int i=0;i<8;i++) { cd[i] = new Card(this); connect(cd[i],&Card::sendSelf,this,&MainWindow::getObject); cd[i]->move(i%4*200,i/4*400+20); } } MainWindow::~MainWindow() { delete ui; } //获取控件坐标 void MainWindow::getObject(Card *w) { temp = w; startP = cursor().pos()-this->pos(); yuanP = temp->pos(); /*将此小部件提升到父小部件堆栈的顶部*/ temp->raise(); } //移动事件 void MainWindow::mouseMoveEvent(QMouseEvent *event) { temp->move(yuanP.x()+event->x()-startP.x(),yuanP.y()+event->y()-startP.y()); } //拖拽对象置顶，卡牌积压的时候，拖动的那张卡牌置顶 void MainWindow::mouseReleaseEvent(QMouseEvent *event) { temp->raise(); }
以下是工程源码：
链接：https://pan.baidu.com/s/1YH95FzZV7_idanob2qeHig
提取码：wbsy
