運行截圖如下：

代碼如下：

mylistwidget.h

#ifndef MYLISTWIDGET_H #define MYLISTWIDGET_H#include <QObject> #include <QListWidget>class MyListWidget : public QListWidget {Q_OBJECT public:MyListWidget(QWidget *parent = 0);void mousePressEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event);public slots:void receiverData(QPoint pos);signals:void wantToGetPoint();private:bool m_dragFlag;int m_currX,m_currY;//當前的控件的寬度和高度bool m_leftFlag,m_rightFlag; //是拖動左邊還是右邊int m_currWinX,m_currWinY; //當前窗口X坐標與Y坐標int m_widgetX,m_widgetY; //控件所處的坐標 };#endif // MYLISTWIDGET_H

widget.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include "mylistwidget.h"namespace Ui { class Widget; }class Widget : public QWidget {Q_OBJECTpublic:explicit Widget(QWidget *parent = 0);~Widget();public slots:void receiverSIGNAL(); signals:void sendPoint(QPoint pos);private:Ui::Widget *ui; };#endif // WIDGET_H

mian.cpp

#include "widget.h" #include <QApplication>int main(int argc, char *argv[]) {QApplication a(argc, argv);Widget w;w.show();return a.exec(); }

mylistwidget.cpp

#include "mylistwidget.h" #include <QMouseEvent> #include <QDebug> #include <QCursor>MyListWidget::MyListWidget(QWidget *parent):QListWidget(parent),m_dragFlag(false),m_leftFlag(false),m_rightFlag(false) {}void MyListWidget::mousePressEvent(QMouseEvent *event) {if(event->x()<=15){ //左邊this->setCursor(Qt::SizeHorCursor);m_dragFlag=true;m_leftFlag=true;m_rightFlag=false;}else if(event->x()>=this->width()-15){ //右邊this->setCursor(Qt::SizeHorCursor);m_dragFlag=true;m_leftFlag=false;m_rightFlag=true;}m_currX=this->width();m_currY=this->height();m_widgetX=this->pos().x();m_widgetY=this->pos().y();event->ignore(); }void MyListWidget::mouseMoveEvent(QMouseEvent *event) {if(m_dragFlag){//分左右考慮if(m_leftFlag){emit wantToGetPoint();this->setGeometry(m_currWinX,this->pos().y(),m_currX+(m_widgetX-m_currWinX),m_currY);}else if(m_rightFlag){this->resize(event->x(),m_currY);}else{}}//qDebug()<<"x:"<<event->x(); }void MyListWidget::mouseReleaseEvent(QMouseEvent *event) {this->setCursor(Qt::ArrowCursor);m_dragFlag=false; }void MyListWidget::receiverData(QPoint pos) {this->m_currWinX=pos.x();this->m_currWinY=pos.y(); }

widget.cpp

#include "widget.h" #include "ui_widget.h" #include <QDebug> #include <QMouseEvent> #include <QCursor>Widget::Widget(QWidget *parent) :QWidget(parent),ui(new Ui::Widget) {ui->setupUi(this);connect(ui->widget,SIGNAL(wantToGetPoint()),this,SLOT(receiverSIGNAL()));connect(this,SIGNAL(sendPoint(QPoint)),ui->widget,SLOT(receiverData(QPoint)));ui->treeView->setMouseTracking(true);for(int i=0;i<5;i++){ui->widget->insertItem(0,"*****第"+QString::number(i)+"行*****");} }Widget::~Widget() {delete ui; }void Widget::receiverSIGNAL() {QPoint point=mapFromGlobal(QCursor::pos());//qDebug()<<point; 不要直接把mapFromGlobal(QCursor::pos())傳進去，不然有BUGemit this->sendPoint(point); }

總結

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