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_OBJECTpublic: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