如何使用 Qt C++ 隐藏另一个 class ui？

Question

I've been trying to hide another class ui, but I can't figure it out.

As an example I have the MainWindow class and other two classes. This is a scheme of the MainWindow ui:

[---------------][---------------]

[ Class A ui ][ Class B ui ]

[---------------][---------------]

The top & bottom lines are just to outline the window. You can imagine it as a rectangle containing two rectangles with the classes ui inside.

When I click on a QPushButton in class AI want to hide class B ui.

This is a code snippet:

ClassA.h

 #ifndef CLASSA_H #define CLASSA_H #include <QWidget> namespace Ui { class ClassA; } class ClassA: public QWidget { Q_OBJECT public: explicit ClassA(QWidget *parent = nullptr); ~ClassA(); public slots: void on_pushButton_clicked(); private: Ui::ClassA *ui; }; #endif // CLASSA_H

ClassA.cpp

 #include "classa.h" #include "ui_classa.h" ClassA::ClassA(QWidget *parent): QWidget(parent), ui(new Ui::ClassA) { ui->setupUi(this); } ClassA::~ClassA() { delete ui; } void classA::on_pushButton_clicked() { // code to hide ClassB ui }

ClassB & MainWindow are brand new (standard). ClassB ui contains some labels, pushButtons,.... MainWindow ui contains two QWidgets that are promoted to ClassA ui & ClassB ui.

What code should I write in the on_pushButton_clicked() slot? I've made some tries but nothing seems to work.

Any help would be much appreciated.

Answer 1

one way is to add a signal in ClassA and emit it when clicking on the considered push button:

 #ifndef CLASSA_H #define CLASSA_H #include <QWidget> namespace Ui { class ClassA; } class ClassA: public QWidget { Q_OBJECT public: explicit ClassA(QWidget *parent = nullptr); ~ClassA(); public signals: void notifyButtonClicked(); public slots: void on_pushButton_clicked(); private: Ui::ClassA *ui; }; #endif // CLASSA_H

and in classA.cpp we have:

 void classA::on_pushButton_clicked() { emit notifyButtonClicked(); }

now you can write this code in mainwindow constructor (assume _A is an object of ClassA):

 connect(_A, &ClassA::notifyButtonClicked, this, [] { // some code for hiding ClassB });

I haven't tested this, because I dont have Qt on this machine, but that should work, with possible minor modifications. If any errors appear, let me know and I will help. Also, read the signals and slots documentation.