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QT topic: basic components (button class, layout class, output class, input class, container class)

2022-07-29 07:24:00 【Astray King】

Catalog

Button class

Layout class

Output class

  Input class

Container class

Today, let's meet QT Some basic components in , This is the basis of our graphical interface programming , Need to remember ！

Button class

1. General button QPushButton

The header file

        #include <QPushButton>

To use a button, you need to declare it in the header file

        QPushButton *bt_button; // Declare a normal button

Then put the button part new come out ：

        bt_button=new QPushButton;

2. Tool button QToolButton

The header file

        #include <QToolButton>

To use a button, you need to declare it in the header file

        QToolButton *bt_tool; // Declare a tool button

Then put the button part new come out ：

        bt_tool=new QToolButton;

3. Radio button QRadioButton

The header file

        #include <QRadioButton>

To use a button, you need to declare it in the header file

        QRadioButton *bt_radio; // Declare a radio button

Then put the button part new come out ：

        bt_radio=new QRadioButton;

4. Check button QCheckBox

The header file

        #include <QCheckBox>

To use a button, you need to declare it in the header file

        QCheckBox *bt_check; // Declare a check button

Then put the button part new come out ：

        bt_check=new QCheckBox;

5. Command button QCommandLinkButton

The header file     

        #include <QCommandLinkButton>

To use a button, you need to declare it in the header file

        QCommandLinkButton *bt_cmd; // Declare a command button

Then put the button part new come out ：

         bt_cmd=new QCommandLinkButton;

We can perform some operations through command buttons, such as jumping to a website

Now let's show a piece of code , We will show the above buttons

First declare the button in the header file ：

private:
    QPushButton *bt_button; // General button 
    QToolButton *bt_tool;   // Tool button 
    QRadioButton *bt_radio; // Radio button 
    QRadioButton *bt_radio1;// Radio button 
    QCheckBox *bt_check;    // Check button 
    QCheckBox *bt_check1;   // Check button 
    QCommandLinkButton *bt_cmd;// Command button 
    QLineEdit *le;// Row edit box 
    QCheckBox *ck;

Later on cpp File ：

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    bt_button = new QPushButton(" General button ");

    bt_tool = new QToolButton;
    bt_tool->setText(" Tool button ");

    bt_radio = new QRadioButton(" Radio button ");
    bt_radio1 = new QRadioButton(" Radio button 1");

    bt_check = new QCheckBox(" Check box ");
    bt_check1 = new QCheckBox(" Check box 1");

    bt_cmd = new QCommandLinkButton(" Baidu ");
    bt_cmd->setDescription("www.baidu.com");

     // application 
    le = new QLineEdit;
    le->setEchoMode(QLineEdit::Password);
    ck = new QCheckBox(" Display password ");

    QVBoxLayout *vbox = new QVBoxLayout;// Vertical layout 
    vbox->addWidget(bt_button);// Add buttons to the vertical layout 
    vbox->addWidget(bt_tool);
    vbox->addWidget(bt_radio);
    vbox->addWidget(bt_radio1);
    vbox->addWidget(bt_check);
    vbox->addWidget(bt_check1);
    vbox->addWidget(bt_cmd);

    vbox->addWidget(le);
    vbox->addWidget(ck);
    setLayout(vbox);// Paste the layout on the main interface 
    connect(bt_check, SIGNAL(toggled(bool)), this, SLOT(xxx(bool)));// Front and rear connections 
    connect(ck, SIGNAL(toggled(bool)), this, SLOT(showpass(bool)));
} 
void Widget::showpass(bool x)
{
    if(!x)
        le->setEchoMode(QLineEdit::Password);// Display in encrypted form 
    else
        le->setEchoMode(QLineEdit::Normal);// Display in the normal way 
}

void Widget::xxx(bool x)
{
    qDebug() << x;
}

Let's take a look at the interface after running ：

  Of course, we can connect through the front and rear platforms , Use the slot function to give different functions to the keys ！！connect() function
connect() The four arguments in the function are : A signal sent by an object 、 Transmitted signal 、 The object receiving the signal and the slot to be executed , Signals and slots should be used separately SIGNAL() and SLOT() The macro is enclosed .

Layout class

1. Horizontal layout QHBoxLayout

2. Vertical layout QVBoxLayout

3. Grid layout QGridLayout

Output class

1. label QLabel

The header file

         #include <QLabel>

It needs to be declared before use , Our label components can display different types of content , Can display text , You can also display pictures and animations ！

        QLabel *lb_text;// Show text tags

        QLabel *lb_pix;// display picture

        QLabel *lb_gif;// Show animation

Of course, we need to use different functions to realize the corresponding functions

        1.setAlignment(QT::AlignCenter)： centered

        2.setMinimumSize(x,y); Set the minimum zoom size of the picture

        3.setScaledContents(true); Auto zoom display , In this way, the part will scale with the interface

        4.setPixmap(QPixmap(" Picture path ")); display picture

        5.setMovie(m);// Show animation  

        QMovie *m=new QMovie( route )

        m->start();// Start

2. Text browser QTextBrowser

 /* Text browser （html）*/
    tbrowser = new QTextBrowser;
    tbrowser->setText("<!DOCTYPE html>\
                      <html>\
                      <head>\
                      <meta charset=\"utf-8\">\
                      <title>runoob.com</title>\
                      </head>\
                      <body>\
                          <h1  >AAAAAAAA</h1>\
                          <p style=\"background-color:rgb(255,0,0)\">BBBBBBBBB</p>\
                      </body>\
                      </html>");

The text browser can display html Formatted text

3. The calendar QCalendarWidget

  /* Calendar window */
    caw = new QCalendarWidget;
    connect(caw, SIGNAL(clicked(QDate)), this, SLOT(showDate(QDate)));// The date of clicking can be displayed in other parts , Like text tags

4. Seven digital tubes QLcdNumber

/* Seven digital tubes */
    lcd = new QLCDNumber;
    lcd->setMinimumHeight(50);
    lcd->display(250); // Show numbers

5. Progress bar QProgressBar

 /* Progress bar */
    pbr = new QProgressBar;
    pbr->setValue(60);

Now let's use these components to form a graphical interface , The code is as follows ：

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    /* label */
    lb_text = new QLabel(" Label testing ");
    lb_text->setAlignment(Qt::AlignCenter);// centered 

    lb_pix = new QLabel(" I'm the picture ");
    lb_pix->setMinimumSize(300, 300);
    lb_pix->setScaledContents(true); // Auto zoom display 
    lb_pix->setPixmap(QPixmap("C:\\Users\\admin\\Desktop\\ picture \\pic4"));

    lb_gif = new QLabel(" I am animation ");
    QMovie *m = new QMovie("C:\\Users\\admin\\Desktop\\ picture \\1.gif");
    lb_gif->setMovie(m);
    m->start();

    /* Text browser （html）*/
    tbrowser = new QTextBrowser;
    tbrowser->setText("<!DOCTYPE html>\
                      <html>\
                      <head>\
                      <meta charset=\"utf-8\">\
                      <title>runoob.com</title>\
                      </head>\
                      <body>\
                          <h1  >AAAAAAAA</h1>\
                          <p style=\"background-color:rgb(255,0,0)\">BBBBBBBBB</p>\
                      </body>\
                      </html>");

    /* Calendar window */
    caw = new QCalendarWidget;

    /* Seven digital tubes */
    lcd = new QLCDNumber;
    lcd->setMinimumHeight(50);
    lcd->display(250); // Show numbers 

    /* Progress bar */
    pbr = new QProgressBar;
    pbr->setValue(60);

    // Add vertical layout 
    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(pbr);
    vbox->addWidget(lcd);
    vbox->addWidget(caw);
    vbox->addWidget(tbrowser);
    vbox->addWidget(lb_text);
    vbox->addWidget(lb_pix);
    vbox->addWidget(lb_gif);
    setLayout(vbox);
    
    connect(caw, SIGNAL(clicked(QDate)), this, SLOT(showDate(QDate)));

    QTimer *t = new QTimer;
    connect(t, SIGNAL(timeout()), this, SLOT(update_value()));// Timer 
    t->start(100);
}

void Widget::update_value(void)
{
    static int data = 0;
    lcd->display(data);// Set the nixie tube to display numbers 
    pbr->setValue(data);// Set the progress bar to display numbers 
    data++;
    if(data == 100)
        data = 0;
}

void Widget::showDate(QDate d)
{
    lb_text->setText(d.toString());// The date we clicked is displayed in the text tab 
}

Let's see the results ：

  Input class

1. Combo box , A drop-down box QComboBox

 /* Combo box 、 A drop-down box */
    cmb = new QComboBox;  // Construct combo box 
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic4");
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic3");
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic2");// Add options

2. Font drop-down box QFontComboBox

 /* Font drop-down box */
    fcmb = new QFontComboBox;e
    connect(fcmb, &QFontComboBox::currentFontChanged, [&](QFont f){ lb->setFont(f);});

3. Row edit box QLineEdit

 /* Row edit box */
    le = new QLineEdit;
    le->setPlaceholderText(" user name ");

4. Text edit box QTextEdit

/* Text edit box */
    te = new QTextEdit;
    connect(te, SIGNAL(textChanged()), this, SLOT(te_to_lb()));

5. Spin button QSpinBox

/* Spin frame */
    sb = new QSpinBox;
    sb->setMaximum(200); // Maximum can only be 20
    sb->setSingleStep(5); // Set the single step span 
    connect(sb, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

6. Time editor QTimeEdit

/* Time edit box */
    timee = new QTimeEdit;
    connect(timee, SIGNAL(timeChanged(QTime)), this, SLOT(show_time(QTime)));

7. knob QDial

/* knob */
    dl = new QDial;
    dl->setRange(0, 1000); // Set the adjustment range 
    connect(dl, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

8. Scroll bar QScrollBar

/* Scroll bar */
    slb = new QScrollBar;
    slb->setRange(0, 1000); // Set the adjustment range 
    slb->setOrientation(Qt::Horizontal); // Display scheme “ level ”
    connect(slb, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

9. Slide bar QSlider

/* Slide the lever */
    sd = new QSlider;
    sd->setRange(0, 1000); // Set the adjustment range 
    sd->setOrientation(Qt::Horizontal); // Display scheme “ level ”
    connect(sd, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

Combine the above components ：

#include "widget.h"
#include <QVBoxLayout>
#include <QFont>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    lb = new QLabel(" Hello ");

    lcd = new QLCDNumber;
    lcd->setMinimumHeight(50);
    lcd->setDigitCount(10); // Set the number of display data 

    /* Combo box 、 A drop-down box */
    cmb = new QComboBox;  // Construct combo box 
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic4");
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic3");
    cmb->addItem("C:\\Users\\admin\\Desktop\\ picture \\pic2");

    connect(cmb, SIGNAL(activated(int)), this, SLOT(show_int(int)));
    connect(cmb, SIGNAL(activated(QString)), this, SLOT(show_str(QString)));
    connect(cmb, SIGNAL(activated(QString)), lb, SLOT(setText(QString)));
    //connect(cmb, &QComboBox::activated, [&](int i) { lb->setPixmap(QPixmap(cmb->itemText(i)));});
    connect(cmb, SIGNAL(activated(QString)), this, SLOT(show_pic(QString)));

    /* Font drop-down box */
    fcmb = new QFontComboBox;
    connect(fcmb, &QFontComboBox::currentFontChanged, [&](QFont f){ lb->setFont(f);});

    /* Row edit box */
    le = new QLineEdit;
    le->setPlaceholderText(" user name ");

    /* Text edit box */
    te = new QTextEdit;
    connect(te, SIGNAL(textChanged()), this, SLOT(te_to_lb()));

    /* Spin frame */
    sb = new QSpinBox;
    sb->setMaximum(200); // Maximum can only be 20
    sb->setSingleStep(5); // Set the single step span 
    connect(sb, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

    /* Time edit box */
    timee = new QTimeEdit;
    connect(timee, SIGNAL(timeChanged(QTime)), this, SLOT(show_time(QTime)));

    /* knob */
    dl = new QDial;
    dl->setRange(0, 1000); // Set the adjustment range 
    connect(dl, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

    /* Scroll bar */
    slb = new QScrollBar;
    slb->setRange(0, 1000); // Set the adjustment range 
    slb->setOrientation(Qt::Horizontal); // Display scheme “ level ”
    connect(slb, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

    /* Slide the lever */
    sd = new QSlider;
    sd->setRange(0, 1000); // Set the adjustment range 
    sd->setOrientation(Qt::Horizontal); // Display scheme “ level ”
    connect(sd, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(lb);
    vbox->addWidget(lcd);
    vbox->addWidget(le);
    vbox->addWidget(cmb);
    vbox->addWidget(fcmb);
    vbox->addWidget(te);
    vbox->addWidget(sb);
    vbox->addWidget(timee);
    vbox->addWidget(dl);
    vbox->addWidget(slb);
    vbox->addWidget(sd);

    setLayout(vbox);
}

void Widget::show_time(QTime t)
{
    lcd->display(t.toString());// Display time through nixie tube 
}

void Widget::te_to_lb()
{
    lb->setText(te->toPlainText());// Display the contents of the text box to the text label 
}

void Widget::show_pic(QString path)
{
    lb->setPixmap(QPixmap(path));// display picture 
}

void Widget::show_int(int data)
{
    qDebug() << data;
}

void Widget::show_str(QString str)
{
    qDebug() << str;
}

See how it works ：

 

Container class

1. Group box QGroupBox

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    lb[0] = new QLabel(" subject 1 safasfasfasdf");
    rb[0] = new QRadioButton("aaaaa");
    rb[1] = new QRadioButton("bbbbb");
    rb[2] = new QRadioButton("ccccc");

    QVBoxLayout *vbox1 = new QVBoxLayout;
    vbox1->addWidget(lb[0]);
    vbox1->addWidget(rb[0]);
    vbox1->addWidget(rb[1]);
    vbox1->addWidget(rb[2]);

    g1 = new QGroupBox("AAAA");   // Container with border display and annotation 
    g1->setLayout(vbox1);
///
    lb[1] = new QLabel(" subject 2 dhjdfdjdjfdjdfdjjjjfd");
    rb[3] = new QRadioButton("xxxxx");
    rb[4] = new QRadioButton("yyyyy");
    rb[5] = new QRadioButton("zzzzz");

    QVBoxLayout *vbox2 = new QVBoxLayout;
    vbox2->addWidget(lb[1]);
    vbox2->addWidget(rb[3]);
    vbox2->addWidget(rb[4]);
    vbox2->addWidget(rb[5]);

    g2 = new QGroupBox("BBBB");     // Container with border display and annotation 
    g2->setLayout(vbox2);

    QVBoxLayout *vbox3 = new QVBoxLayout;
    vbox3->addWidget(g1);
    vbox3->addWidget(g2);
    setLayout(vbox3);

}

Running results ：

 

2.widget

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    lb[0] = new QLabel(" subject 1 safasfasfasdf");
    rb[0] = new QRadioButton("aaaaa");
    rb[1] = new QRadioButton("bbbbb");
    rb[2] = new QRadioButton("ccccc");

    QVBoxLayout *vbox1 = new QVBoxLayout;
    vbox1->addWidget(lb[0]);
    vbox1->addWidget(rb[0]);
    vbox1->addWidget(rb[1]);
    vbox1->addWidget(rb[2]);

    g1 = new QWidget;   // Borderless container 
    g1->setLayout(vbox1);
///
    lb[1] = new QLabel(" subject 2 dhjdfdjdjfdjdfdjjjjfd");
    rb[3] = new QRadioButton("xxxxx");
    rb[4] = new QRadioButton("yyyyy");
    rb[5] = new QRadioButton("zzzzz");

    QVBoxLayout *vbox2 = new QVBoxLayout;
    vbox2->addWidget(lb[1]);
    vbox2->addWidget(rb[3]);
    vbox2->addWidget(rb[4]);
    vbox2->addWidget(rb[5]);

    g2 = new QWidget;   // Borderless container 
    g2->setLayout(vbox2);

    QVBoxLayout *vbox3 = new QVBoxLayout;
    vbox3->addWidget(g1);
    vbox3->addWidget(g2);
    setLayout(vbox3);

}

Running results ：

 

3. Scroll the window QScrollArea

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    lb = new QLabel;
    lb->setPixmap(QPixmap("C:\\Users\\admin\\Desktop\\ picture \\pic2"));
    //lb->setParent(this);

    ar = new QScrollArea; // Scroll window container 
    ar->setWidget(lb);    // Put the label into the container 
    //ar->setParent(this);

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(ar);
    setLayout(vbox);
}

Running results ：

 

4. hold-all QToolBox

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    t1 = new QTextEdit("aaaaaaaaaaaaa");
    t2 = new QTextEdit("bbbbbbbbbbbbbbb");

//    QVBoxLayout *vbox = new QVBoxLayout;
//    vbox->addWidget(t1);
//    vbox->addWidget(t2);
//    setLayout(vbox);
    box = new QToolBox;   // Construct a toolbox container 
    box->addItem(t1, "aaaaa"); // Load the text edit box into the toolbox 
    box->addItem(t2, "bbbbb"); // Load the text edit box into the toolbox 

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(box);
    setLayout(vbox);
}

Running results ：

 

 

5. Tabulation container QTabWidget

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    t1 = new QTextEdit("aaaaaaaaaaaaa");
    t2 = new QTextEdit("bbbbbbbbbbbbbbb");

    box = new QTabWidget;    // Construct a tabulation container 
    box->setTabsClosable(true);// Show the close button 
    box->addTab(t1, "aaaa"); // Insert a new label 
    box->addTab(t2, "bbbb"); // Insert a new label 

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(box);
    setLayout(vbox);

    connect(box, SIGNAL(tabCloseRequested(int)), this, SLOT(close_tab(int)));
}

Running results ：

 

6. Trestle window QStackedWidget

#include "widget.h"
#include <QVBoxLayout>

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    t1 = new QTextEdit("aaaaaaaaaaaaa");
    t2 = new QTextEdit("bbbbbbbbbbbbbbb");

    box = new QStackedWidget;    // Construct a stack container 
    box->addWidget(t1);  // Insert a new label 
    box->addWidget(t2); // Insert a new label 

    // test 
    cb = new QComboBox;
    cb->addItem(" Text 1");
    cb->addItem(" Text 2");

    connect(cb, SIGNAL(activated(int)), box, SLOT(setCurrentIndex(int)));

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(cb);
    vbox->addWidget(box);
    setLayout(vbox);

}

Running results ：

 

 

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本文为[Astray King]所创，转载请带上原文链接，感谢
https://yzsam.com/2022/210/202207290658478331.html

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