qt 实现窗口置顶，qtdesigner创建的widget窗口集成程序里的用法

参考 https://blog.csdn.net/Larry_Yanan/article/details/123518788

.ui文件如下

新建的ui文件，编译一下就会生成对应的 ui_xxx.h 文件，文件内就有对应的 namespace Ui 声明的变量，这个变量要在mainwindow.h中声明，然后在mainwindow.cpp中new出来，具体使用如下

mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWidget>

namespace Ui {
class MainWindow;
class page_pdo;
class page_param;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    Ui::page_param *ui_page_param;
    Ui::page_pdo *ui_page_pdo;
    QWidget *parent_page_pdo;
    QWidget *parent_page_param;
    QWidget *parent_active=nullptr;
};

#endif // MAINWINDOW_H

mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "ui_page_pdo.h"
#include "ui_page_param.h"


#include <QTimer>
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);
    parent_page_pdo=new QWidget();
    parent_page_param=new QWidget();
    ui_page_param=new Ui::page_param;
    ui_page_pdo=new Ui::page_pdo;
    ui_page_param->setupUi(parent_page_param);
    ui_page_pdo->setupUi(parent_page_pdo);

    parent_page_pdo->setWindowTitle("parent_page_pdo");
    parent_page_param->setWindowTitle("parent_page_param");
    parent_page_param->setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint);//这种方式主界面还能编辑,加上主界面disable和定时监测，结合定时器监测可以实现警告提示
    parent_page_pdo->setWindowFlags(Qt::Dialog | Qt::WindowStaysOnTopHint);
//    parent_page_param->setWindowModality(Qt::ApplicationModal);//这种方式，主界面无法修改，可以实现基本功能，但是无法实现警告提示
//    parent_page_pdo->setWindowModality(Qt::ApplicationModal);

    connect(ui->btn_skip_page_param,&QPushButton::clicked,this,[=]() mutable{
        if(parent_active)parent_active->hide();
        parent_page_param->show();
        parent_active=parent_page_param;
        this->setEnabled(false);
        //this->setWindowOpacity(0.5); // 设置窗口半透明
    });
    connect(ui->btn_skip_page_pdo,&QPushButton::clicked,this,[=]() mutable{
        if(parent_active)parent_active->hide();
        parent_page_pdo->show();
        parent_active=parent_page_pdo;
        this->setEnabled(false);
    });
    parent_active=nullptr;

    connect(ui_page_pdo->btn_cancel,&QPushButton::clicked,this,[=]() mutable{ this->setEnabled(true);parent_active=nullptr;parent_page_pdo->hide();qDebug() <<ui_page_pdo->data_1->text(); });
    connect(ui_page_pdo->btn_ok,&QPushButton::clicked,this,[=]() mutable{ this->setEnabled(true);parent_active=nullptr;parent_page_pdo->hide();qDebug() << ui_page_pdo->data_1->text(); });
    connect(ui_page_param->btn_cancel,&QPushButton::clicked,this,[=]() mutable{ this->setEnabled(true);parent_active=nullptr;parent_page_param->hide();qDebug() << ui_page_param->data_1->text(); });
    connect(ui_page_param->btn_ok,&QPushButton::clicked,this,[=]() mutable{ this->setEnabled(true);parent_active=nullptr;parent_page_param->hide();qDebug() << ui_page_param->data_1->text(); });

    QTimer* timerSendAnimCAN = new QTimer(this);
    connect(timerSendAnimCAN,&QTimer::timeout,this,[=]() mutable{
        QWidget *activeWindow = QApplication::activeWindow();
        if (activeWindow) { qDebug() << "Active window:" << activeWindow->windowTitle(); }
        if(parent_active){
            if (activeWindow==parent_active) {
                parent_active->setStyleSheet("");
            }
            else {
                QString res=QString("#%1{%2}").arg(parent_active->objectName()).arg("border:2 solid red;");
                parent_active->setStyleSheet(res);
            }
        }
    });
    timerSendAnimCAN->setTimerType(Qt::PreciseTimer);
    timerSendAnimCAN->start(100);
}

MainWindow::~MainWindow()
{
    delete ui;
}

运行效果