知识点

geometry().x() 多屏幕实现方法

#include <QWidget>  
#include <QPoint>  
#include <QScreen>  
  
// 假设这个函数是某个QWidget的子类中的成员函数  
void MyWidget::showGlobalXPosition() {  
    // 获取窗口部件的左上角位置（相对于其父窗口）  
    QPoint localPos = this->pos();  
  
    // 将局部位置转换为全局屏幕位置  
    QPoint globalPos = this->mapToGlobal(localPos);  
  
    // 现在globalPos.x()就是窗口部件的全局x坐标  
    int globalX = globalPos.x();  
  
    // 输出或使用globalX  
    qDebug() << "Global X position:" << globalX;  
  
    // 如果你还想知道这个坐标属于哪个屏幕，可以这样做：  
    QScreen *screen = QGuiApplication::screens().at(0); // 默认取第一个屏幕，但通常你会想找到实际的屏幕  
    for (QScreen *scr : QGuiApplication::screens()) {  
        if (scr->geometry().contains(globalPos)) {  
            screen = scr;  
            break;  
        }  
    }  
  
    // 现在screen变量指向了包含窗口部件的屏幕  
    qDebug() << "The widget is on screen:" << screen->name(); // 假设屏幕有名字  
}

geometry.h

#ifndef GEOMETRY_H
#define GEOMETRY_H
#include <QWidget>
#include <QDialog>
#include <QLabel>
#include <QGridLayout>
#include <QMoveEvent>
#include <QResizeEvent>

class geometry : public QDialog
{
    Q_OBJECT

public:
    geometry(QWidget *parent = nullptr);
    ~geometry();
    void UpdateLabel();
private:
    QLabel* xLabel;
    QLabel* xValueLabel;
    QLabel* yLabel;
    QLabel* yValueLabel;
    QLabel* FrmLabel;
    QLabel* FrmValueLabel;
    QLabel* PosLabel;
    QLabel* PosValueLabel;
    QLabel* GeoLabel;
    QLabel* GeoValueLabel;
    QLabel* WidthLabel;
    QLabel* WidthValueLabel;
    QLabel* HeightValueLabel;
    QLabel* HeightLabel;
    QLabel* RectLabel;
    QLabel* RectValueLabel;
    QLabel* SizeLabel;
    QLabel* SizeValueLabel;
    QGridLayout* MainLayout;
protected:
    void moveEvent(QMoveEvent*);
    void resizeEvent(QResizeEvent*);


};
#endif // GEOMETRY_H

geometry.cpp

#include "geometry.h"

geometry::geometry(QWidget *parent)
    : QDialog(parent)
{
    setWindowTitle(tr("Geometry"));
    xLabel = new QLabel(tr("x():"));
    xValueLabel = new QLabel;
    yLabel = new QLabel(tr("y():"));
    yValueLabel = new QLabel;
    FrmLabel = new QLabel(tr("Frame:"));
    FrmValueLabel = new QLabel;
    PosLabel =new QLabel(tr("pos():"));
    PosValueLabel =new QLabel;
    WidthLabel = new QLabel("Width():");
    WidthValueLabel = new QLabel;
    HeightLabel = new QLabel(tr("Height():"));
    HeightValueLabel = new QLabel;
    RectLabel = new QLabel(tr("rect():"));
    RectValueLabel = new QLabel;
    SizeLabel = new QLabel(tr("Size():"));
    SizeValueLabel =new QLabel;
    GeoLabel = new QLabel(tr("Geometry():"));
    GeoValueLabel = new QLabel;
    MainLayout = new QGridLayout(this);
    MainLayout->addWidget(xLabel,0,0);
    MainLayout->addWidget(xValueLabel,0,1);
    MainLayout->addWidget(yLabel,1,0);
    MainLayout->addWidget(yValueLabel,1,1);
    MainLayout->addWidget(FrmLabel,2,0);
    MainLayout->addWidget(FrmValueLabel,2,1);
    MainLayout->addWidget(PosLabel,3,0);
    MainLayout->addWidget(PosValueLabel,3,1);
    MainLayout->addWidget(WidthLabel,4,0);
    MainLayout->addWidget(WidthValueLabel,4,1);
    MainLayout->addWidget(HeightLabel,5,0);
    MainLayout->addWidget(HeightValueLabel,5,1);
    MainLayout->addWidget(RectLabel,6,0);
    MainLayout->addWidget(RectValueLabel,6,1);
    MainLayout->addWidget(SizeLabel,7,0);
    MainLayout->addWidget(SizeValueLabel,7,1);
    MainLayout->addWidget(GeoLabel,8,0);
    MainLayout->addWidget(GeoValueLabel,8,1);
    UpdateLabel();
}

geometry::~geometry() {}

void geometry::UpdateLabel()
{
    QString xStr,yStr;
    xValueLabel->setText(xStr.setNum(x()));
    yValueLabel->setText(yStr.setNum(y()));

    QString FrameStr;
    QString TmpStr1,TmpStr2,TmpStr3,TmpStr4;
    FrameStr = TmpStr1.setNum(frameGeometry().x()) + ","+TmpStr2.setNum(frameGeometry().y())+","+ TmpStr3.setNum(frameGeometry().width()) + ","+TmpStr4.setNum(frameGeometry().height());
    FrmValueLabel->setText(FrameStr);

    QString PositionStr;
    QString TmpStr11,TmpStr12;
    PositionStr = TmpStr11.setNum(pos().x()) + "," +TmpStr12.setNum(pos().y());
    PosValueLabel->setText(PositionStr);



    QString wStr,hStr;
    WidthValueLabel->setText(wStr.setNum(width()));
    HeightValueLabel->setText(hStr.setNum(height()));

    QString RectStr;
    QString TmpStr31,TmpStr32,TmpStr33,TmpStr34;
    RectStr = TmpStr31.setNum(rect().x()) + "," +TmpStr32.setNum(rect().y())+ "," + TmpStr33.setNum(rect().width()) + ","+TmpStr34.setNum(rect().height());
    RectValueLabel->setText(RectStr);

    QString SizeStr,TmpStr41,TmpStr42;
    SizeStr = TmpStr41.setNum(size().width()) + "," +TmpStr42.setNum(rect().height());
    SizeValueLabel->setText(SizeStr);
    /*
*/

}

void geometry::moveEvent(QMoveEvent *)
{
    UpdateLabel();
}

void geometry::resizeEvent(QResizeEvent *)
{
    UpdateLabel();
}

main.cpp

#include "geometry.h"

#include <QApplication>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    geometry w;
    w.show();
    return a.exec();
}

运行图