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Window Maangement

Configuring Application Icons

Set the window icon and taskbar icon using setWindowIcon():

// mainwindow.cpp
MainWindow::MainWindow(QWidget* parent)
    : QMainWindow(parent)
{
    setWindowIcon(QIcon(":/assets/app_icon.png"));
}

Configure the executable icon by adding a resource entry in the project file:

# project.pro
RC_ICONS = app_icon.ico

Signal and Slot Mapping with QSignalMapper

Use QSignalMapper to route multiple signals through a single handler when identifying the source is necessary:

// widget.h
#include <QSignalMapper>
#include <QWidget>
#include <QPushButton>

class ButtonPanel : public QWidget
{
    Q_OBJECT

public:
    explicit ButtonPanel(QWidget* parent = nullptr);

signals:
    void buttonActivated(const QString& labelText);

private slots:
    void handleButtonClick();

private:
    QSignalMapper* m_mapper;
};

// widget.cpp
#include "widget.h"

ButtonPanel::ButtonPanel(QWidget* parent)
    : QWidget(parent)
    , m_mapper(new QSignalMapper(this))
{
    QList<QPushButton*> buttons = findChildren<QPushButton*>();
    
    for (QPushButton* button : buttons)
    {
        connect(button, &QPushButton::clicked, 
                m_mapper, &QSignalMapper::map);
        m_mapper->setMapping(button, button->text());
    }
    
    connect(m_mapper, &QSignalMapper::mappedString,
            this, &ButtonPanel::buttonActivated);
}