46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
#include <QCustomPlot.h>
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#include <QMouseEvent>
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#include <QPointF>
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#include <cmath>
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#include <QDebug>
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class DraggablePixmap : public QCPItemPixmap {
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Q_OBJECT
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public:
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DraggablePixmap(QCustomPlot *parentPlot) : QCPItemPixmap(parentPlot) {
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setSelectable(true); // 确保项是可选的，这对于接收鼠标事件很重要
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}
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protected:
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bool mDragging = false;
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QPointF mDragStart; // 拖拽开始时的位置
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void mousePressEvent(QMouseEvent *event, const QPointF &pos) {
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QCPItemPixmap::mousePressEvent(event, pos); // 调用基类的处理函数
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if (event->button() == Qt::LeftButton) { // 仅当左键被按下时开始拖拽
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mDragging = true;
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mDragStart = pos; // 记录当前位置作为起始点
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}
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}
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void mouseMoveEvent(QMouseEvent *event, const QPointF &pos) override {
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QCPItemPixmap::mouseMoveEvent(event, pos); // 调用基类的处理函数
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if (mDragging) {
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// 计算新的位置并更新项的位置
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double dx = pos.x() - mDragStart.x();
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double dy = pos.y() - mDragStart.y();
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qDebug() << "QCPItemPixmap mouseMoveEvent:" << QString::number(dx) << ":" << QString::number(dy);
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//this->setPos(/*position().x() + */dx, /*position().y() +*/ dy); // 更新项的位置
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}
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}
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void mouseReleaseEvent(QMouseEvent *event, const QPointF &pos) override {
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QCPItemPixmap::mouseReleaseEvent(event, pos); // 调用基类的处理函数
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if (event->button() == Qt::LeftButton) { // 仅当左键被释放时停止拖拽
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mDragging = false;
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}
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}
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};
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