Qt/C++ - Lesson 060. Configuring the appearance of the application in runtime

QStyle, QStyleFactory, Fusion, QPalette

Suppose there is a task to change the appearance of the application written on QWidget. To change the style of the application application, you can use both the QPalette classes, and install the style through QStyleSheet for specific elements, and using the QStyle class and the built-in styles that are obtained with QStyleFactory (or created independently with QStylePlugin ).

Let's take a look at two options for creating an application style using the built-in Fusion style. Namely, it will be dark and bright.

In the application under study, there are several interface elements to show the difference in design styles. But there are also two functional elements that change the style of the application in runtime. These are two buttons with the inscriptions: Dark and Light . Each button has its own clicked signal processing slot.

main.cpp

When you run the application immediately install the theme of Fusion .

#include "widget.h"
#include <QApplication>
#include <QStyleFactory>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    // Let's set the design style
    // The standard palette is light
    qApp->setStyle(QStyleFactory::create("Fusion"));

    Widget w;
    w.show();

    return a.exec();
}

widget.h

This class is responsible for the application window that was shown above. In the header file, there are two slots for processing the clicks on the buttons Dark and Light , which were added to the application via the graphic designer.

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>

namespace Ui {
class Widget;
}

class Widget : public QWidget
{
    Q_OBJECT

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

private slots:
    // Slot handler button click to install a dark design
    void on_darkPushButton_clicked();
    // Slot handler button click to install a light design
    void on_lightPushButton_clicked();

private:
    Ui::Widget *ui;
};

#endif // WIDGET_H

widget.cpp

And in the implementation of slots, the necessary palette is already created, to decorate the application interface with Qt. In this case, the style of the application will change in runtime, without restarting the application itself.

#include "widget.h"
#include "ui_widget.h"

#include <QApplication>

Widget::Widget(QWidget *parent) :
    QWidget(parent),
    ui(new Ui::Widget)
{
    ui->setupUi(this);
}

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

void Widget::on_darkPushButton_clicked()
{
    // Create a palette for a dark theme
    QPalette darkPalette;

    // Customize the color palette for the interface elements
    darkPalette.setColor(QPalette::Window, QColor(53, 53, 53));
    darkPalette.setColor(QPalette::WindowText, Qt::white);
    darkPalette.setColor(QPalette::Base, QColor(25, 25, 25));
    darkPalette.setColor(QPalette::AlternateBase, QColor(53, 53, 53));
    darkPalette.setColor(QPalette::ToolTipBase, Qt::white);
    darkPalette.setColor(QPalette::ToolTipText, Qt::white);
    darkPalette.setColor(QPalette::Text, Qt::white);
    darkPalette.setColor(QPalette::Button, QColor(53, 53, 53));
    darkPalette.setColor(QPalette::ButtonText, Qt::white);
    darkPalette.setColor(QPalette::BrightText, Qt::red);
    darkPalette.setColor(QPalette::Link, QColor(42, 130, 218));
    darkPalette.setColor(QPalette::Highlight, QColor(42, 130, 218));
    darkPalette.setColor(QPalette::HighlightedText, Qt::black);

    // Install this palette
    qApp->setPalette(darkPalette);
}

void Widget::on_lightPushButton_clicked()
{
    // To return to the light palette, 
    // it's enough to set the standard palette from the skin
    qApp->setPalette(style()->standardPalette());
}

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b

It is possible that you upload the project please

With example.

Yes. Of course. But some later. I haven't got opportunity for this now.

I added archive with project. You will find it in the end of artcile.

b

thanks for the reply, great tutorial


No problem. If You need some advices, You can ask me and community of site on the forum .

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Last comments
April 3, 2020, 8:06 a.m.
Konstantin Grudnitskiy

Я надеюсь вы уже разобрались в чем дело, но если вдруг нет, то проблема состоит в том, что вы пытаетесь запустить программу из интерпретатора питона. Файл main.py это уже готова…
April 3, 2020, 6:18 a.m.
Konstantin Grudnitskiy

>>> text = 'hello world'>>> ' '.join(word for word in text.split()[:-1])'hello'>>> def remove_last_word(text):... return text and ' '.join(word for word in text.s…
March 27, 2020, 2:40 p.m.
Evgenij Legotskoj

Добрый день. В конце пятой статьи скачать можете.
March 27, 2020, 2:28 p.m.
mkdir _

Здравствуйте, а можно, пожалуйста, ссылку на целые исходники, если есть?
March 27, 2020, 4:36 a.m.
Evgenij Legotskoj

Скорее всего также, как и для установки всех остальных переменых в CMake, через использование set
Now discuss on the forum
April 5, 2020, 5:09 a.m.
IscanderChe

Попробуйте CQtDeployer или windeployqt.
April 5, 2020, 2:35 a.m.
Mihailll

Так работает console.log(textEmail.text) var str = textEmail.text; var n = str.search(/^((([0-9A-Za-z]{1}[-0-9A-z\.]{1,}[0-9A-Za-z]{1})|([0-9А-Яа-я]{1}[-0-9А-я\.]{1,}[…
April 3, 2020, 12:53 p.m.
BlinCT

Само собою на компе этого незаметно.
April 3, 2020, 8:48 a.m.
Intruder

Евгений, добрый день. Спасибо!
s
April 3, 2020, 7:52 a.m.
solmik

да вроде много чего установленно, если неправильный путь указать то же самое, пробовал запустить видео через плей лист (по примерам из док)и из него назад путь взять, не получилось
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