QT窗口应用

#include "mainwindow.h"

#include "ui_mainwindow.h"

#include

MainWindow::MainWindow(QWidget *parent) :

    QMainWindow(parent),

    ui(new Ui::MainWindow)

{

    ui->setupUi(this);

    设置窗口的最大尺寸

//    setMaximumSize(1200,1200);

    设置窗口最小尺寸

//    setMinimumSize(300,300);

//    设置窗口固定尺寸

//    设置窗口标题

    setWindowTitle("焊接");

//    设置窗口图标

    setWindowIcon(QIcon("D:QTweldingpenguin-512.png"));

    connect(this, &MainWindow::windowTitleChanged, this, [=](const QString &title)

    {

        qDebug() <<"新的标题"< 
    });
 
 
 
    connect(this, &MainWindow::windowIconChanged, this, [=](const QIcon &icon)
 
    {
 
        qDebug()<<"新的图标";
 
    });
 
 
    setContextMenuPolicy(Qt::CustomContextMenu);
 
    connect(this, &MainWindow::customContextMenuRequested, this, [=](const QPoint &pos)
 
    {
 
        QMenu menu;
 
        menu.addAction("西红柿");
 
        menu.addAction("黄瓜");
 
        menu.addAction("茄子");
 
        menu.addAction("土豆");
 
        menu.exec(QCursor::pos());
 
    });
 
 
}
 
 
MainWindow::~MainWindow()
 
{
 
    delete ui;
 
}
 
 
void MainWindow::on_movebtn_clicked()
 
{
 
    QRect rect = this->frameGeometry();
 
    move(rect.topLeft() + QPoint(10,20));
 
}
 
 
void MainWindow::on_positionbtn_clicked()
 
{
 
    QRect rect = this->frameGeometry();
 
    qDebug()<<"左上角："< 
           <<"右上角："< 
           <<"左下角："< 
           <<"右下角："< 
           <<"高度："< 
          <<"宽度："< 
 
}
 
 
void MainWindow::on_geometrybtn_clicked()
 
{
 
    int x = 100 + rand() % 500;
 
    int y = 100 + rand() % 500;
 
    int width = this->width() + 10;
 
    int height = this->height() + 10;
 
    setGeometry(x, y, width, height);
 
 
 
 
 
}
 
 
void MainWindow::on_modifybtn_clicked()
 
{
 
    setWindowTitle("你好，世界");
 
    setWindowIcon(QIcon("D:QTwelding93605103784951875.jpg"));
 
 
}