QRubberBand比較簡單，沒啥好講的，直接上示例。
.h

#ifndef WIDGET_H #define WIDGET_H#include <QWidget> #include <QRubberBand> #include <QMouseEvent> #include <QCheckBox>class Widget : public QWidget {Q_OBJECTpublic:Widget(QWidget *parent = nullptr);~Widget();protected:void mousePressEvent(QMouseEvent *event);void mouseMoveEvent(QMouseEvent *event);void mouseReleaseEvent(QMouseEvent *event); private:QRubberBand* m_rubberband;QPoint m_oldpoint;QPoint m_oldglobalpoint;QRect m_selectglobalrect;QRect m_selectrect;QList<QCheckBox*> m_boxList; }; #endif // WIDGET_H

.cpp

#include "widget.h" #include <QDebug> #include <QGridLayout>Widget::Widget(QWidget *parent): QWidget(parent) {QGridLayout* lay = new QGridLayout();for (int i = 0; i < 10; ++i) {for (int j = 0; j < 4; ++j) {QCheckBox* box = new QCheckBox(QString::number((i+1)*j),this);box->setFixedSize(50,20);box->setStyleSheet("background:green");lay->addWidget(box,i,j);m_boxList.append(box);}}this->setLayout(lay);m_rubberband = new QRubberBand(QRubberBand::Rectangle); }Widget::~Widget() { }void Widget::mousePressEvent(QMouseEvent *event) {m_oldglobalpoint = event->globalPos(); //獲取桌面坐標m_oldpoint = event->pos(); //獲取當前窗口坐標m_rubberband->setGeometry(QRect(m_oldglobalpoint,m_oldglobalpoint));m_rubberband->show(); }void Widget::mouseMoveEvent(QMouseEvent *event) {m_selectglobalrect = QRect(m_oldglobalpoint,event->globalPos()); //獲取相對桌面的選擇區域m_selectrect = QRect(m_oldpoint,event->pos()); //獲取相對當前窗口的界面m_rubberband->setGeometry(m_selectglobalrect.normalized()); }void Widget::mouseReleaseEvent(QMouseEvent *event) {m_rubberband->hide();//存在交叉則選中for (int i = 0; i < m_boxList.size(); ++i) {if (m_selectrect.intersects(m_boxList[i]->geometry())){m_boxList[i]->setChecked(true);}} }

總結

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