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
