QT realizes serial debugging assistant (7): Font setting panel creation and value transfer between windows

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General serial port debugging tools have a function panel to modify the font of the serial port receiving box, let's add one:

 

1. Create a font setting panel first

For example, if we create a widget and name it letterFormWindow class, QTcreator will automatically generate .cpp, .h and .ui files

 

2. Add some components to the UI interface, as shown in the figure:


3. Now go back to the main interface file writing, and add a shortcut button in the main interface command bar

QMenuBar *menuBar = ui->menuBar;
QAction *letterPanlAct = menuBar->addAction("字体设置");

4. Bind this shortcut button to the creation of the letterFormWindow window just now, so click the shortcut key to call up the font setting panel

    connect(letterPanlAct,&QAction::triggered,
            [=] ()
            {
                if(letterFormUi == NULL)
                {
                    letterFormUi = new letterFormWindow;
                    connect(letterFormUi, SIGNAL(sendFont(QFont)), this, SLOT(receiveFont(QFont)));
                }
                letterFormUi->show();
            }
    );

 

5. Pay attention to this sentence connect(letterFormUi, SIGNAL(sendFont(QFont)), this, SLOT(receiveFont(QFont))), bind the sendFont function event of the sub-interface to the receiveFont function of the main interface, which is used to connect the sub-interface The set font is transferred to the main interface for modification.

 

6. Sub-interface realization: header file

class letterFormWindow : public QWidget
{
    Q_OBJECT

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

private slots:

    void on_buttonBox_accepted();

    void on_fontComboBox_currentFontChanged(const QFont &f);

    void on_spinBox_valueChanged(int arg1);

    void ChangeFont(void);

signals:
    void sendFont(QFont);   //用来传递数据的信号

private:
    Ui::letterFormWindow *letterUi;

    QFont tempFont; //缓存字体

};

CPP file:

#include "letterformwindow.h"
#include "ui_letterformwindow.h"

letterFormWindow::letterFormWindow(QWidget *parent) :
    QWidget(parent),
    letterUi(new Ui::letterFormWindow)
{
    letterUi->setupUi(this);

    letterUi->spinBox->setValue(10);
}

letterFormWindow::~letterFormWindow()
{
    delete letterUi;
}

void letterFormWindow::on_buttonBox_accepted()
{
    emit sendFont(tempFont);    //向主界面传递该字体
    this->hide();
}

void letterFormWindow::on_fontComboBox_currentFontChanged(const QFont &f)
{
    tempFont.setFamily(f.family());
    ChangeFont();
}

void letterFormWindow::on_spinBox_valueChanged(int arg1)
{
    tempFont.setPointSize(arg1);
    ChangeFont();
}

void letterFormWindow:: ChangeFont(void)
{
    letterUi->label->setFont(tempFont);
}

7. Create the main interface receiving function, receive the font QFont from the font setting panel, and update the font of the text in the serial port receiving box

//接收字体窗口
void MainWindow::receiveFont(QFont font)
{
    ui->uartReadPlain->setFont(font);
}

8. Declare the font window interface in the header file of the main interface (mainly to open the last opened window, not to open a new one every time)

private:

    Ui::MainWindow *ui;

    letterFormWindow *letterFormUi = NULL;  //字体窗口

9. In this way, you can set the font, as shown below:

Only two text attributes are set here: font and size. Of course, you can set more. The methods are the same. Just add a few more components to configure.