初学C++，想实现小方块的点击和移动，直接给小方块的父元素 widget_7 绑定了事件监听，虽然实现了，却不理想。
#include <QMouseEvent>#include "dragwin.h"QPoint MediaServer::m_qMousePoint;bool MediaServer::m_bIsMousePressed = false;DragWin* MediaServer::curWidget;MediaServer::MediaServer(QWidget *parent) :QWidget(parent),ui(new Ui::MediaServer){ui->setupUi(this);ui->widget_7->installEventFilter(this); // 操作区}bool MediaServer::eventFilter(QObject *watched, QEvent *event) {QMouseEvent* pEvent = static_cast<QMouseEvent *>(event); //将事件转换成鼠标事件,进行鼠标事件过滤switch (pEvent->type()){case QEvent::MouseButtonPress: //单击if(pEvent->button() == Qt::LeftButton){m_bIsMousePressed = true;curWidget = qobject_cast<DragWin*>(watched);m_qMousePoint = pEvent->globalPos() - curWidget->pos(); //如果左键按下则记录当前鼠标在widget中位置qDebug() << "鼠标按下 pEvent->globalPos() ==== " << pEvent->globalPos();qDebug() << "鼠标按下 curWidget->pos() ==== " << curWidget->pos();}return true;case QEvent::MouseButtonRelease:if(pEvent->button() == Qt::LeftButton){QList<DragWin*> labelList = ui->widget_7->findChildren<DragWin*>();for(int i = 0; i < labelList.size(); i++){DragWin* label = labelList.at(i);label->setStyleSheet("background:#fff;border:1px solid #ccc;margin:0;");}curWidget = qobject_cast<DragWin*>(watched);curWidget->setStyleSheet("background:#fff;border:10px solid red;margin:0;");ui->winX->setText(QString::number(curWidget->pos().x()));ui->winY->setText(QString::number(curWidget->pos().y()));ui->winW->setText(QString::number(curWidget->rect().width()));ui->winH->setText(QString::number(curWidget->rect().height()));m_bIsMousePressed = false;qDebug() << "鼠标释放 pEvent->globalPos() ==== " << pEvent->globalPos();}return true;case QEvent::MouseMove:if(m_bIsMousePressed && (pEvent->buttons() == Qt::LeftButton)){qDebug() << "小窗口拖拽 event->type()==== " << event->type();curWidget = qobject_cast<DragWin*>(watched);int iL= pEvent->globalPos().x() - m_qMousePoint.x();int iT= pEvent->globalPos().y() - m_qMousePoint.y();iL <= 0 && (iL = 0);iT <= 0 && (iT = 0);curWidget->move(iL, iT);ui->winX->setText(QString::number(iL));ui->winY->setText(QString::number(iT));qDebug() << "鼠标拖拽 pEvent->globalPos() ==== " << pEvent->globalPos();qDebug() << "鼠标拖拽 m_qMousePoint ==== " << m_qMousePoint;return true;}default:break;}return QWidget::eventFilter(watched, event);}
#ifndef MEDIASERVER_H#define MEDIASERVER_H#include <QWidget>#include "dragwin.h"using namespace neb;QT_BEGIN_NAMESPACEnamespace Ui { class MediaServer; }QT_END_NAMESPACEclass MediaServer : public QWidget{Q_OBJECTpublic:explicit MediaServer(QWidget *parent = nullptr);~MediaServer();protected:bool eventFilter(QObject *watched, QEvent *event) ;public:static DragWin* curWidget;static QPoint m_qMousePoint;//记录当前位置static bool m_bIsMousePressed;//记录鼠标松放private:Ui::MediaServer *ui;DragWin* newWidget = nullptr;QVector<DragWin*> winList;};#endif // MEDIASERVER_H
DragWin是方块类，后来把事件写到类里实现。可以看下大概思路
#include "dragwin.h"#include "mediaserver.h"#include <QDebug>#include <QMouseEvent>DragWin::DragWin(QWidget *parent) : PainterGragh(parent){this->setCursor(QCursor(Qt::DragLinkCursor));}int DragWin::parseJSON(CJsonObject je) {je.Get("winId",winId);je.Get("winx", winX);je.Get("winy", winY);je.Get("winw", winW);je.Get("winh", winH);je.Get("winz", winZ);return 0;}void DragWin::mousePressEvent(QMouseEvent *event)//QMouseEvent *event{// QMouseEvent* pEvent = static_cast<QMouseEvent *>(event);if(event->button()==Qt::LeftButton){m_bIsMouseMove = false;MediaServer::m_bIsMousePressed = true;// m->curWidget = qobject_cast<QWidget*>(watched);MediaServer::curWidget = this;MediaServer::m_qMousePoint = event->globalPos() - MediaServer::curWidget->pos(); //如果左键按下则记录当前鼠标在widget中位置}else if(event->button()==Qt::RightButton){qDebug()<<"RightButton clicked!！！！！！！！！！！！！！";}}void DragWin::mouseReleaseEvent(QMouseEvent *event){if(event->button()==Qt::LeftButton){QString strX = QString::number(MediaServer::curWidget->pos().x());QString strY = QString::number(MediaServer::curWidget->pos().y());QString strW = QString::number(MediaServer::curWidget->rect().width());QString strH = QString::number(MediaServer::curWidget->rect().height());emit sendParamSignals(strX, strY, strW, strH);// winxEdit->setText(strX);// winyEdit->setText(strY);// winwEdit->setText(strW);// winhEdit->setText(strH);MediaServer::m_bIsMousePressed = false;qDebug() << "PainterGragh 鼠标释放 点击窗口 ==== " << event->globalPos() << " m_bIsMouseMove== " << m_bIsMouseMove << endl;if(m_bIsMouseMove) {QTcpClient *tcp= QTcpClient::getInstance();int wid = MediaServer::curWidget->getId();qDebug() << "窗口移动位置 wid ==== " << wid << endl;QString str1 = "{\"srxApi\":\"setWinRect\",\"param\":{\"wid\":"+ QString::number(wid) +",\"winx\":"+ strX +",\"winy\":"+ strY +",\"winw\":"+ strW +",\"winh\":"+ strH +"}}";tcp->sendJson(str1);qDebug() << "窗口移动位置 发送指令 ==== " << event->globalPos() << m_bIsMouseMove << endl;}m_bIsMouseMove = false;}}void DragWin::mouseMoveEvent(QMouseEvent *event){if(MediaServer::m_bIsMousePressed && (event->buttons() == Qt::LeftButton)){m_bIsMouseMove = true;// qDebug() << "PainterGragh 小窗口拖拽 event->type()==== " << event->type() << this << endl;// qDebug() << "PainterGragh 鼠标拖拽 pEvent->globalPos() ==== " << event->globalPos();// qDebug() << "PainterGragh 鼠标拖拽 m_qMousePoint ==== " << MediaServer::m_qMousePoint;// MediaServer::curWidget = qobject_cast<QWidget*>(watched);MediaServer::curWidget = this;int iL= event->globalPos().x() - MediaServer::m_qMousePoint.x();int iT= event->globalPos().y() - MediaServer::m_qMousePoint.y();iL <= 0 && (iL = 0);iT <= 0 && (iT = 0);MediaServer::curWidget->move(iL, iT);QString strW = QString::number(MediaServer::curWidget->rect().width());QString strH = QString::number(MediaServer::curWidget->rect().height());emit sendParamSignals(QString::number(iL), QString::number(iT), strW, strH);// winxEdit->setText(QString::number(iL));// winyEdit->setText(QString::number(iT));}}
#ifndef DRAGWIN_H#define DRAGWIN_H#include <QWidget>#include "paintergragh.h"#include <QLineEdit>#include <QMouseEvent>#include <QPoint>#include <QCursor>#include <QRect>#include "CJsonObject.hpp"using namespace neb;#define PADDING 2class DragWin : public PainterGragh{Q_OBJECTpublic:explicit DragWin(QWidget *parent = nullptr);public:int winId;int winZ;int winX;int winY;int winW;int winH;int getId(){return winId;}void setId(int val){winId = val;}int getWinZ(){return winZ;}void setWinZ(int val){winZ = val;}int parseJSON(CJsonObject je);signals:public slots:private:bool m_bIsMouseMove = false;bool isLeftPressDown;QPoint dragPosition;protected:void mousePressEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);signals:void sendParamSignals(QString x, QString y, QString w, QString h);public://QLineEdit *winxEdit;//QLineEdit *winyEdit;//QLineEdit *winwEdit;//QLineEdit *winhEdit;};#endif // DRAGWIN_H
//新建几行几列void MediaServer::on_new_btn_clicked(){int line = ui->usrRow->text().toInt();int col = ui->usrLine->text().toInt();int winwVal = ui->winW->text().toInt();int winhVal = ui->winH->text().toInt();int winW = 100, winH = 100;if(winwVal && winhVal) {winW = winwVal;winH = winhVal;}for (int i=0;i<line;i++) {for (int j=0;j<col;j++) {DragWin *widget = new DragWin(ui->widget_7);// widget->winxEdit = ui->winX;//这个是指向PainterGragh// widget->winyEdit = ui->winY;// widget->winwEdit = ui->winW;// widget->winhEdit = ui->winH;widget->setGeometry(i*winW,j*winH,winW,winH);widget->setStyleSheet("background:#fff;border:1px solid #ccc;margin:0;");widget->show();curWidget = widget;qDebug() << "新建 curWidget==== " << curWidget << endl;connect(widget, &DragWin::sendParamSignals, this, &MediaServer::winParamSlot);QString strX = QString::number(curWidget->pos().x());QString strY = QString::number(curWidget->pos().y());QString strW = QString::number(winW);QString strH = QString::number(winH);ui->winX->setText(strX);ui->winY->setText(strY);ui->winW->setText(strW);ui->winH->setText(strH);}}}//新建窗口时 绑定槽函数，点击方块和拖拽时更新 x/y/w/hvoid MediaServer::winParamSlot(QString strX, QString strY, QString strW, QString strH){ui->winX->setText(strX);ui->winY->setText(strY);ui->winW->setText(strW);ui->winH->setText(strH);}
