QT basic day 2 (2) QT basic components: button class, layout class, output class, input class, container and other individual examples

We said that before qt Basic development process of program

1. State the necessary components

2. Construct components

3. Necessary layout

4. Front and back desk Association

5. beautify

Today we will continue to talk about qt Basic components of .

One . Button class

Push Button ： Button

Tool Button ： Tool button

Radio Button ： Radio button

Check Button ： Check box

Command Link Button ： Command link button

Dialog Button Box ： Dialog box button box

  Example ：

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QPushButton>
#include <QToolButton>
#include <QRadioButton>
#include <QCheckBox>
#include <QCommandLinkButton>
#include <QLineEdit>

class Widget : public QWidget
{
    Q_OBJECT
public slots:
    void xxx(bool x);
    void showpass(bool);

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

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;
    QCheckBox *ck;
};

#endif // WIDGET_H

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

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;
    vbox->addWidget(bt_button);
    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);

//    connect(bt_button, SIGNAL(clicked(bool)), this, SLOT(xxx(bool)));
//    connect(bt_radio, SIGNAL(toggled(bool)), this, SLOT(xxx(bool)));
    connect(bt_check, SIGNAL(toggled(bool)), this, SLOT(xxx(bool)));
    connect(ck, SIGNAL(toggled(bool)), this, SLOT(showpass(bool)));
}

void Widget::showpass(bool x)
{
    if(!x)
        le->setEchoMode(QLineEdit::Password);
    else
        le->setEchoMode(QLineEdit::Normal);
}

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

Widget::~Widget()
{

}

 

Two . Layout class

Vertical Layout： Vertical layout

Horizontal Layout： Horizontal layout

Grid Layout： Grid layout

Form Layout： Form layout

3、 ... and . Output class

Label： label

Text Browser： Text browser

Graphics View： Graphic view

Calendar Widget： The calendar

LCD Number： LCD Digital

Progress Bar： Progress bar

Horizontal Line： Level

Vertical Line： Vertical line

OpenGL Widget：OpenGL Tools

QQuickWidget： The embedded QML Tools

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include <QLabel>
#include <QTextBrowser>
#include <QCalendarWidget>
#include <QDate>
#include <QLCDNumber>
#include <QProgressBar>

class Widget : public QWidget
{
    Q_OBJECT
public slots:
    void showDate(QDate);
    void update_value(void);

public:
    Widget(QWidget *parent = 0);
    ~Widget();
private:
    QLabel *lb_text; // Text label 
    QLabel *lb_pix;  // Picture label 
    QLabel *lb_gif;  // Animated tags 

    QTextBrowser *tbrowser;
    QCalendarWidget *caw;
    QLCDNumber *lcd;
    QProgressBar *pbr;
};

#endif // WIDGET_H

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

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

    lb_pix = new QLabel(" I'm the picture ");
    lb_pix->setMinimumSize(10, 10);
    lb_pix->setScaledContents(true); // Auto zoom display 
    lb_pix->setPixmap(QPixmap("C:\\Users\\ThinkPad T490\\Desktop\\220501\\1.bmp"));

    lb_gif = new QLabel(" I am animation ");
    QMovie *m = new QMovie("C:\\Users\\ThinkPad T490\\Desktop\\220501\\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);


    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()));
    t->start(100);
}

void Widget::update_value(void)
{
    static int data = 0;
    lcd->display(data);
    pbr->setValue(data);
    data++;
    if(data == 100)
        data = 0;
}

void Widget::showDate(QDate d)
{
    lb_text->setText(d.toString());
}

Widget::~Widget()
{

}

Four . Input class

Combo Box： Combo box

/* Combo box 、 A drop-down box */
    cmb = new QComboBox;  // Construct combo box 
    cmb->addItem("C:\\Users\\ThinkPad T490\\Desktop\\220501\\1.bmp");
    cmb->addItem("C:\\Users\\ThinkPad T490\\Desktop\\220501\\pc.bmp");
    cmb->addItem("C:\\Users\\ThinkPad T490\\Desktop\\220501\\x.jpg");
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 Combo Box： Font combo box

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

Line Edit： Row edit box

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

Text Edit： Text edit box

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

Plain Text Edit： Plain text edit box
Spin Box： Digital display box （ Rotating box ）

 /* Spin frame */
    sb = new QSpinBox;
    sb->setMaximum(20); // Maximum can only be 20
    sb->setSingleStep(10); // Set the single step span 
    connect(sb, SIGNAL(valueChanged(int)), lcd, SLOT(display(int)));

Double Spin Box：Double Digital display box
Time Edit： Time edit

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

Date Edit： Date editing
Date/Time Edit： date / Time edit
Dial： dial
Horizontal Scroll Bar： Horizontal scroll bar
Vertical Scroll Bar： Vertical scroll bar

 /* 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)));

Horizontal Slider： Horizontal slider
Vertical Slider： Vertical slider

 /* 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)));

Key Sequence Edit： Key sequence edit box
5、 ... and . Container class

Group Box： Group box

 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);

Scroll Area： Scroll area
Tool Box： hold-all
Tab Widget： Label component
Stacked Widget： Stack parts
Frame： frame
Widget： The widget
MDI Area：MDI Area
Dock Widget： Dock form part
QAxWidget： encapsulation Flash Of ActiveX Control
6、 ... and . Space interval group

Horizontal Spacer： Horizontal spacing

Vertical Spacer： Vertical spacing

7、 ... and . Project view group

List View： List view

Tree View： Tree view

Table View： Tabular chart

Column View： Column view

Undo View： Undo view

8、 ... and . Project control group

List Widget： List control

Tree Widget： Tree control

Table Widget： Table control

Object-oriented thinking ：

Example ：

qustion.h

#ifndef QUSTIONWIDGET_H
#define QUSTIONWIDGET_H

#include <QWidget>
#include <QLabel>
#include <QRadioButton>
#include <QVBoxLayout>

class qustionWidget : public QWidget
{
    Q_OBJECT
public:
    qustionWidget(QWidget *parent = nullptr);

public:
    void setquestion(QString str);  // Set the topic 
    void addAnswer(QString str);    // Add options 

private:
    QLabel *lb;   // Show title 
    //QVector<QRadioButton *> bt;
    QVBoxLayout *vbox; // Display options 
};

#endif // QUSTIONWIDGET_H

widget.h

#ifndef WIDGET_H
#define WIDGET_H

#include <QWidget>
#include "qustionwidget.h"

class Widget : public QWidget
{
    Q_OBJECT

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

    qustionWidget *q1;
    qustionWidget *q2;
    qustionWidget *q3;
};

#endif // WIDGET_H

qustiopn.cpp 

#include "qustionwidget.h"

qustionWidget::qustionWidget(QWidget *parent) :
    QWidget(parent)
{
    lb = new QLabel;
    //bt.clear();
    vbox = new QVBoxLayout;
    vbox->addWidget(lb);
    setLayout(vbox);
}

void qustionWidget::setquestion(QString str)
{
    lb->setText(str);
}

void qustionWidget::addAnswer(QString str)
{
    QRadioButton *an = new QRadioButton(str);
    vbox->addWidget(an);
}

 widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent)
{
    q1 = new qustionWidget;   // subject “ Control ”
    q1->setquestion("xxxxxxxxxxxxxxxxxxxxxxxxxxx");
    q1->addAnswer("aaaaaaa");
    q1->addAnswer("bbbbbbb");
    q1->addAnswer("ccccccc");
    q1->addAnswer("dddddddddd");

    q2 = new qustionWidget; // subject “ Control ”
    q2->setquestion("yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
    q2->addAnswer("xxxxx");
    q2->addAnswer("yyyyyy");
    q2->addAnswer("zzzzzzzzzzzzz");

    q3 = new qustionWidget; // subject “ Control ”
    q3->setquestion("yyyyyyyyyyyyyyyyyyyyyyyyyyyyyyyy");
    q3->addAnswer("xxxxx");
    q3->addAnswer("yyyyyy");
    q3->addAnswer("zzzzzzzzzzzzz");

    QVBoxLayout *vbox = new QVBoxLayout;
    vbox->addWidget(q1);
    vbox->addWidget(q2);
    vbox->addWidget(q3);
    setLayout(vbox);
}

Widget::~Widget()
{

}

effect ：