QScriptEngine eng;
QScriptEngineDebugger debugger;
debugger.attachTo(&eng);
QScriptValue consoleObj = eng.newQObject(this);
eng.globalObject().setProperty("asd", consoleObj);
QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
QLineEdit *edit = new QLineEdit(this);
qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
edit->show();
qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler) is not working, but when i am using handler.call(QScriptValue(),args) it works well;
QScriptValueList args;
args << 3;
handler.call(QScriptValue(),args);
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
Q_INVOKABLE void log(QString msg);
~MainWindow();
private slots:
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<qscriptengine.h>
#include<qscriptenginedebugger.h>
#include<qlineedit.h>
#include<qdebug.h>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QScriptEngine eng;
QScriptEngineDebugger debugger;
debugger.attachTo(&eng);
QScriptValue consoleObj = eng.newQObject(this);
eng.globalObject().setProperty("asd", consoleObj);
QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
QLineEdit *edit = new QLineEdit(this);
qDebug()<<qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
edit->show();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::log(QString msg)
{
qDebug() << "jsConsole: "<< msg;
}
A variable created in a method that is not created in the heap is deleted when it finishes executing the method, in your case the QScriptEngine is created in the constructor reason why it is eliminated, and all the script depends on it. The solution is simple, make the QScriptEngine member of the class:
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QScriptEngine>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
Q_INVOKABLE void log(const QString & text);
private:
Ui::MainWindow *ui;
QScriptEngine eng; // member
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QLineEdit>
#include <QScriptEngine>
#include <QScriptEngineDebugger>
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
QScriptEngineDebugger debugger;
debugger.attachTo(&eng);
QScriptValue consoleObj = eng.newQObject(this);
eng.globalObject().setProperty("asd", consoleObj);
QScriptValue handler= eng.evaluate("(function(text) { asd.log('text was changed to '+text); })");
QLineEdit *edit = new QLineEdit(this);
qScriptConnect(edit, SIGNAL(textChanged(QString)), QScriptValue(), handler);
edit->show();
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::log(const QString &text)
{
qDebug()<< text;
}
Related
.h
class MainWindow: public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
Ui::MainWindowClass ui;
private slots:
void on_pushButton_clicked();
};
.cpp
void Test()
{
MainWindow mw;
mw.ui.pushButton->move(QPoint(200, 200));
qDebug() << "test" << "\n";
}
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
{
ui.setupUi(this);
QShortcut *shortcut = new QShortcut(QKeySequence(Qt::CTRL + Qt::Key_Q), this);
QObject::connect(shortcut, &QShortcut::activated, this, &Test);
return;
}
How to access the contents of ui from the class MainWindow in the function Test without making Test a child/inherit MainWindow?
I think the way i did is not working as when the function is called with the shortcut the button isnt moved.
Qt compiles ui files into ui_<ui_name>.h (you can see them in your build folder).
So you can use ui just include ui_<ui_name>.h
Example
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
QT_BEGIN_NAMESPACE
namespace Ui { class MainWindow; }
QT_END_NAMESPACE
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
MainWindow(QWidget *parent = nullptr);
~MainWindow();
Ui::MainWindow *ui;
private:
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent)
: QMainWindow(parent)
, ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
main.cpp
#include "mainwindow.h"
#include <QApplication>
#include "ui_mainwindow.h"
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
w.ui->progressBar->setValue(30);
return a.exec();
}
I have a problem. I created two classes in my Qt project. One as the main window, and second as the settings dialog. My idea is to send the values from "Settings" to "MainWindow" (like from one TextEdit to another) but unfortunately, I have no idea how to do it. It's confusing me. I have read similar topics on the internet but none of them gives me a clear answer. Can someone help me understand the way how can I do it via example?
I have no useful code to place it here, so I will put the part of the source code and headers of mine.
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
[...]
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "settings.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow()
[...]
private:
Ui::MainWindow *ui;
[...]
};
#endif // MAINWINDOW_H
settings.cpp
#include "settings.h"
#include "ui_settings.h"
#include "mainwindow.h"
#include "ui_mainwindow.h"
Settings::Settings(QWidget *parent) :
QDialog(parent),
ui(new Ui::Settings)
{
ui->setupUi(this);
}
settings.h
#ifndef SETTINGS_H
#define SETTINGS_H
#include <QDialog>
namespace Ui {
class Settings;
}
class Settings : public QDialog
{
Q_OBJECT
public:
explicit Settings(QWidget *parent = nullptr);
~Settings();
[...]
private:
Ui::Settings *ui;
[...]
};
#endif // SETTINGS_H
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
Use signals/slots mechanism to share values between two QObject.
For example:
The following code allows yout to send the value in a QLineEdit to another widget by clicking on a button:
class Widget1: public QWidget
{
Q_OBJECT
public:
Widget1(): QWidget(),
message(new QLineEdit())
{
QPushButton* button = new QPushButton("Send msg", this);
connect(button, &QPushButton::clicked, this, [=]() { emit this->sendMsg(message->text());}); // When you click on the button, it will emit the signal sendMsg
QVBoxLayout* layout = new QVBoxLayout(this);
layout->addWidget(message);
layout->addWidget(button);
}
private:
QLineEdit* message;
signals:
void sendMsg(QString const& msg);
};
class Widget2: public QWidget
{
Q_OBJECT
public:
Widget2(): QWidget(),
display(new QLabel("Nothing to display", this))
{
QVBoxLayout* layout = new QVBoxLayout(this);
layout->addWidget(display);
}
private:
QLabel* display;
public slots:
void receive(QString const& message)
{
display->setText(message); // When called, display the message in the label
}
};
int main(int argc, char *argv[])
{
QApplication app(argc, argv);
QWidget* mainWidget = new QWidget();
QHBoxLayout* layout = new QHBoxLayout(mainWidget);
Widget1* w1 = new Widget1();
Widget2* w2 = new Widget2();
layout->addWidget(w1);
layout->addWidget(w2);
// When the signal sendMsg is emitted, call the slot receive
QObject::connect(w1, &Widget1::sendMsg, w2, &Widget2::receive);
mainWidget->show();
return app.exec();
}
There are multiple ways to achieve this.
For example you can provide the public Getter Methods in your dialog for provide value to the public and use them directly in the MainWindow to read those.
Or you can use Signals/Slots as stated above.
One example with Signal/Slots:
The SettingsWindow emits textEdit(QString) signal if Dialog Accepted, and MainWindow receives this signal via on_textEdit(QString) slot and writes it to its own text field:
SettingsWindow reading text input and emitting signal textEdit(QString):
MainWindow receiving signal via slot on_textEdit(QString):
And this is the code:
maindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = nullptr);
~MainWindow();
private slots:
void on_pushButton_clicked();
void on_textEdited(QString txt);
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "settingsdialog.h"
#include <memory>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
auto dlg = new SettingsDialog{this};
connect(dlg, &SettingsDialog::textEdit, this, &MainWindow::on_textEdited);
dlg->setAttribute(Qt::WA_DeleteOnClose);
dlg->show();
}
void MainWindow::on_textEdited(QString txt)
{
ui->textEdit->setText(txt);
}
settingsdialog.h
#ifndef SETTINGSDIALOG_H
#define SETTINGSDIALOG_H
#include <QDialog>
namespace Ui {
class SettingsDialog;
}
class SettingsDialog : public QDialog
{
Q_OBJECT
public:
explicit SettingsDialog(QWidget *parent = nullptr);
~SettingsDialog();
signals:
void textEdit(QString txt);
private slots:
void on_buttonBox_accepted();
private:
Ui::SettingsDialog *ui;
};
#endif // SETTINGSDIALOG_H
settingsdialog.cpp
#include "settingsdialog.h"
#include "ui_settingsdialog.h"
SettingsDialog::SettingsDialog(QWidget *parent) :
QDialog(parent),
ui(new Ui::SettingsDialog)
{
ui->setupUi(this);
}
SettingsDialog::~SettingsDialog()
{
delete ui;
}
void SettingsDialog::on_buttonBox_accepted()
{
emit textEdit(ui->textEdit->toPlainText());
}
More about Signal/Slots
In the program, I want to click a button in the main window and trigger the sub-window to display the image. But I cannot access ui->graphsView in the main window.cpp, how can I do that? In the main.cpp. the click-button function is assumed to do such thing. The QGraphicsView is placed in the ShowPic class.
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QFileSystemModel>
#include "showpic.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
QFileSystemModel *model;
ShowPic *showpic;
QString filesPath;
};
#endif // MAINWINDOW_H
showpic.h
#ifndef SHOWPIC_H
#define SHOWPIC_H
#include <QWidget>
namespace Ui {
class ShowPic;
}
class ShowPic : public QWidget
{
Q_OBJECT
public:
explicit ShowPic(QWidget *parent = 0);
~ShowPic();
private:
Ui::ShowPic *ui;
};
#endif // SHOWPIC_H
main.cpp
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include<QFileDialog>
#include<QFileSystemModel>
#include<QStringList>
#include <QTreeView>
#include <QGraphicsScene>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
showpic = new ShowPic();
showpic->show();
QGraphicsScene scene;
QPixmap pixmap("C:\test\\image.jpg");
scene.addPixmap(pixmap);
ui->graphicsView->setScene(&scene); ///????
}
showpic.cpp
#include "showpic.h"
#include "ui_showpic.h"
ShowPic::ShowPic(QWidget *parent) :
QWidget(parent),
ui(new Ui::ShowPic)
{
ui->setupUi(this);
}
ShowPic::~ShowPic()
{
delete ui;
}
The first thing is that you have to add the QGraphicsScene only once, and a suitable place is in the constructor:
ShowPic::ShowPic(QWidget *parent) :
QWidget(parent),
ui(new Ui::ShowPic)
{
ui->setupUi(this);
ui->graphicsView->setScene(new QGraphicsScene);
}
Then we create a method that receives the pixmap and adds it to the scene:
showpic.h
[...]
explicit ShowPic(QWidget *parent = 0);
~ShowPic();
void addPixmap(const QPixmap &pixmap);
[...]
showpic.h
[...]
void ShowPic::addPixmap(const QPixmap &pixmap){
ui->graphicsView->scene()->addPixmap(pixmap);
}
[...]
And we use that method in the slot on_pushButton_clicked:
void MainWindow::on_pushButton_clicked()
{
showpic = new ShowPic();
QPixmap pixmap("C:\test\\image.jpg");
showpic->addPixmap(pixmap);
showpic->show();
}
My app, consists in 2 different object (QObject and QMainWIndow), and I am wondering how to communicate between them with SLOT/SIGNAL. Moreover, does existing better approach ?
Can someone make an simple example ? Thank :)
sample
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "ui_mainwindow.h"
#include "object.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private:
Ui::MainWindow *ui;
private slots:
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "object.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(ui->chkState, SIGNAL(clicked()), this, SLOT(object->chkState();));
}
MainWindow::~MainWindow()
{
delete ui;
}
object.h
#ifndef OBJET_H
#define OBJET_H
#include "mainwindow.h"
#include <QMainWindow>
#include <QObject>
class Object : public QObject
{
Q_OBJECT
public:
explicit Object(QObject *parent = 0);
bool state;
signals:
private slots:
void chkState(Ui::MainWindow *ui);
};
#endif // OBJET_H
objet.cpp
#include "object.h"
#include "mainwindow.h"
Object::Object(QObject *parent) : QObject(parent)
{
}
void Object::chkState(Ui::MainWindow *ui)
{
if (ui->chkState->isChecked())
{
ui->state->setText("true");
state = true;
}
else
{
ui->state->setText("false");
state = false;
}
}
Here is a simple example of how to emit signals and slots.
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include "object.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
signals:
void transmit_to_object(bool value);
private slots:
void receive_from_object(bool value);
void on_checkBox_clicked();
private:
Ui::MainWindow *ui;
object m_object;
};
#endif // MAINWINDOW_H
#ifndef OBJECT_H
#define OBJECT_H
#include <QObject>
class object : public QObject
{
Q_OBJECT
public:
explicit object(QObject * parent = 0);
signals:
void transmit_to_gui(bool value);
private slots:
void receive_from_gui(bool value);
private:
bool state;
};
#endif // OBJECT_H
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
#include "mainwindow.h"
#include "ui_mainwindow.h"
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
connect(&m_object,SIGNAL(transmit_to_gui(bool)),this,SLOT(receive_from_object(bool)));
connect(this,SIGNAL(transmit_to_object(bool)),&m_object,SLOT(receive_from_gui(bool)));
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::receive_from_object(bool value)
{
if(value)
{
ui->lineEdit->setText("true");
}
else
{
ui->lineEdit->setText("false");
}
}
void MainWindow::on_checkBox_clicked()
{
if(ui->checkBox->isChecked())
{
emit transmit_to_object(true);
}
else
{
emit transmit_to_object(false);
}
}
#include "object.h"
#include "mainwindow.h"
object::object(QObject *parent)
{
}
void object::receive_from_gui(bool value)
{
state = value;
emit transmit_to_gui(state);
}
There are several errors in your code.
First:
connect(ui->chkState, SIGNAL(clicked()), this, SLOT(object->chkState();));
Here you say:
"when we click on the ui->chkState, I want you call a function in this, which is the object->chkState slot". That's definitly not what you want.
What is object ? this object hasn't been created. What you want is :
connect(ui->chkState, SIGNAL(clicked()), myobject, SLOT(chkState()));
with myobject an object of type Object so you need to add in your mainwindow.h a
Object *myobject;
and in your mainwindow.cpp before the connect:
myobject = new Object(this);
Moreover, your function void chkState(Ui::MainWindow *ui); won't work because you cannot get the mainwindow ui in parameter like that.
What I advise you to do, if it's only for tests so you know that parent is the type of MainWindow, you can do:
void Object::chkState()
{
MainWindow* parent = static_cast<MainWindow*>(parent());
if (parent->ui->chkState->isChecked())
{
parent->ui->state->setText("true");
state = true;
}
else
{
parent->ui->state->setText("false");
state = false;
}
}
So the parameter in your slot is removed.
I want to return a QString value from a function that exists in class called DB in my MainWindow class, but it always crashes the application.
db.h
#ifndef DB_H
#define DB_H
#include <QMainWindow>
#include <QtSQl>
#include <QSqlQuery>
#include <QSqlError>
#include <QObject>
#include <QDialog>
class DB : public QMainWindow
{
Q_OBJECT
public:
explicit DB(QWidget *parent = 0);
QString getDriver() const;
void setDriver(const QString &value);
private:
QString Driver="test";
signals:
public slots:
};
#endif // DB_H
and this is db.cpp
#include "db.h"
DB::DB(QWidget *parent) : QMainWindow(parent)
{
}
QString DB::getDriver() const
{
return Driver;
}
void DB::setDriver(const QString &value)
{
Driver = value;
}
mainwindow.h
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
#include <QDebug>
#include <QFileInfo>
#include <QDialog>
#include <QObject>
#include "Db.h"
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
DB *conn;
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
mainwindow.cpp
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
QString driverfromdb = conn->getDriver();
qDebug() << driverfromdb;
}
And this what happen when I click the pushbutton: image
You are declaring a pointer to DB class inside your MainWindow class
DB *conn;
but you never initialize it. At the moment it does not point to anything, so if you try to access it:
QString driverfromdb = conn->getDriver(); // boom, conn is somewhere in the void
The solution is simple, you need to create a DB object before using it, e.g.:
void MainWindow::on_pushButton_clicked()
{
conn = new DB();
QString driverfromdb = conn->getDriver();
qDebug() << driverfromdb;
}
or just let conn be a typical variable, not an pointer:
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
DB conn; // conn is created after creating MainWindow object
This way you have not to initialize anything and you will avoid crashes.
or:
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent), conn(new DB),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete conn;
delete ui;
}