以下是一个简单的示例代码,演示了如何在Qt中实现感知多支手指点击的功能:
#include <QApplication>
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QTouchEvent>
class TouchWidget : public QGraphicsView {
public:
TouchWidget(QWidget *parent = nullptr) : QGraphicsView(parent) {
setViewportUpdateMode(FullViewportUpdate);
setRenderHint(QPainter::Antialiasing);
setAcceptTouchEvents(true);
}
protected:
bool event(QEvent *event) override {
if (event->type() == QEvent::TouchBegin || event->type() == QEvent::TouchUpdate || event->type() == QEvent::TouchEnd) {
QTouchEvent *touchEvent = static_cast<QTouchEvent *>(event);
QList<QTouchEvent::TouchPoint> touchPoints = touchEvent->touchPoints();
foreach (const QTouchEvent::TouchPoint &touchPoint, touchPoints) {
QPointF pos = touchPoint.pos();
qDebug() << "ID: " << touchPoint.id() << ", Position: " << pos;
}
return true;
}
return QGraphicsView::event(event);
}
};
int main(int argc, char *argv[]) {
QApplication app(argc, argv);
QGraphicsScene scene;
scene.setSceneRect(0, 0, 800, 600);
TouchWidget view;
view.setScene(&scene);
view.show();
return app.exec();
}
这个示例创建了一个继承自QGraphicsView的自定义控件TouchWidget,处理触摸事件并输出每个触摸点的位置信息。通过重载event函数来捕获触摸事件,并使用QTouchEvent类获取和处理多点触控信息。
内容由零声教学AI助手提供,问题来源于学员提问