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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 .

Comments

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МБ
April 21, 2019, 9:40 a.m.
Моисей Бушуев

Qt - Test 001. Signals and slots

  • Result:0points,
  • Rating points-10
AA
April 17, 2019, 7:40 p.m.
Anton Ablin

Qt - Test 001. Signals and slots

  • Result:73points,
  • Rating points1
E
April 17, 2019, 6:16 p.m.
Evgeny

Qt - Test 001. Signals and slots

  • Result:100points,
  • Rating points10
Last comments
April 21, 2019, 4:22 p.m.
Евгений Легоцкой

Через метод setIcon table.horizontalHeaderItem(0).setIcon("qrc://path/to/icon.png")
April 21, 2019, 3:48 p.m.
Евгений Легоцкой

Добрый день! Спасибо за комментарий. Там действительно лучше будет сделать с инициализацией по умолчанию.
U
April 18, 2019, 3:37 p.m.
Unreal_man

А как иконку в хедер задать?
u
April 18, 2019, 2:15 a.m.
uaa

доброго времени,большое спасибо за пример для начинающего)при адаптации к своему проекту столкнулся с таким ньансом:в vepolyline.h в 47 строке нужна инициализация по умолчанию: int m_pointF...
E
April 11, 2019, 12:49 p.m.
Evgeny

Спасибо за ответ) У меня компоновщик на нее ругался просто. Оказалось, просто забыл Q_OBJECT в начале класса указать.
Now discuss on the forum
April 24, 2019, 11:22 a.m.
Ruslan Polupan

Согласен. но ситуация не поменялась. Такое чуство что данные не записываются в модель.
April 24, 2019, 6:20 a.m.
Ruslan Polupan

я так понимаю надо инфорация об устройствах.Я бы пробовал так rust@suse:~> lsblk -PNAME="sda" MAJ:MIN="8:0" RM="0" SIZE="111,8G" RO="0" TYPE="disk" MOUNTPOINT=""NAME="sda1" MAJ:MIN="8...
April 21, 2019, 4:16 p.m.
Евгений Легоцкой

Приветствую Нужно сохранять где-то выбранное значение, а потом восстанавливать его. Или использовать QSettings или добавить метод open(), в который передавать начальные значения для того...
R
April 19, 2019, 9:55 a.m.
RED_Spider

мені важко це зараз навіть перевірити, тому що знайшов коміт, це ще було в 2016 році, і цей код не буде працювати коректно зараз, єдине скажу що це були QThread
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