在 Qt 中可以通过组合 QLabel 和鼠标事件来实现这个需求。以下是一个简单的实现步骤：
- 使用
QLabel显示文本。 - 为
QLabel启用鼠标事件，通过重写其mousePressEvent,mouseMoveEvent和mouseReleaseEvent实现拖动功能。 - 将
QLabel设置为窗口的子控件，限制它的移动范围在窗口内。
#include <QApplication>
#include <QWidget>
#include <QLabel>
#include <QMouseEvent>class DraggableLabel : public QLabel {Q_OBJECTpublic:explicit DraggableLabel(QWidget *parent = nullptr) : QLabel(parent), m_isDragging(false) {setText("拖动我！");setStyleSheet("background-color: lightblue; padding: 5px; border: 1px solid black;");setAlignment(Qt::AlignCenter);setFixedSize(100, 50);}protected:void mousePressEvent(QMouseEvent *event) override {if (event->button() == Qt::LeftButton) {m_isDragging = true;m_dragStartPosition = event->pos();}}void mouseMoveEvent(QMouseEvent *event) override {if (m_isDragging) {QPoint newPos = mapToParent(event->pos() - m_dragStartPosition);QRect parentRect = parentWidget()->rect();// 限制 QLabel 不超出父窗口范围newPos.setX(qMax(parentRect.left(), qMin(newPos.x(), parentRect.right() - width())));newPos.setY(qMax(parentRect.top(), qMin(newPos.y(), parentRect.bottom() - height())));move(newPos);}}void mouseReleaseEvent(QMouseEvent *event) override {if (event->button() == Qt::LeftButton) {m_isDragging = false;}}private:bool m_isDragging;QPoint m_dragStartPosition;
};int main(int argc, char *argv[]) {QApplication app(argc, argv);QWidget window;window.setWindowTitle("可拖动文本");window.resize(400, 300);DraggableLabel *label = new DraggableLabel(&window);label->move(150, 125); // 初始位置window.show();return app.exec();
}#include "main.moc"
