一起看代码来玩玩QT之05 Controls

pixmap  : 像素图

combo : 组合

QObject::connect(&button,SIGNAL(clicked()),&w,SLOT(close()));

此连接信号槽 可用 c++  lamboda表达式

 connect(radio, &QRadioButton::clicked, [](bool v){
        qDebug() << v;
    });

 这需要  在 项目pro 中 加    config += C++11

内容有点多，请诸位 一个一个控件看，最好亲手打一遍！！！！！！！ 一个一个控件 试！！！！！！！！！

.h 文件

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include 
#include 
class MyWidget : public QWidget
{
    Q_OBJECT
public:
    explicit MyWidget(QWidget *parent = 0);

    QTextEdit* _edit;

signals:

public slots:
    void slotComboBoxIndexChanged(const QString&);
};

#endif // MYWIDGET_H

.cpp 文件

#include "MyWidget.h"
#include 

#include      // disply static text, or image
#include 
#include  // single line

#include 
#include 
#include 
#include  // multi lines, rich text
#include  // readonly textedit
#include   //
#include     // 模拟方式显示数值
#include   // 数字
#include 
#include 
#include 
#include  // 不介绍,不算控件
#include 
#include 
#include 
#include 
#include  
#include 

MyWidget::MyWidget(QWidget *parent) :
    QWidget(parent)
{
    QVBoxLayout* lay = new QVBoxLayout(this);
    QLabel* label;
    QComboBox* combo;
    QPushButton* button;
    QRadioButton* radio;
    QTextEdit* edit;
    QGroupBox* group;

    lay->addWidget(label = new QLabel("baidu"));
    label->setPixmap(QPixmap("../aaa.png"));

    connect(label, &QLabel::linkActivated, [](QString str){
        qDebug() << str;
    });

    lay->addWidget(button = new QPushButton("Button"));
    button->setStyleSheet("QPushButton {font:bold 16px; color:red; padding:5px}");

    lay->addWidget(radio = new QRadioButton("Radio"));
    radio->setStyleSheet("QRadioButton {font:bold 16px; color:red; padding:5px}");
    connect(radio, &QRadioButton::clicked, [](bool v){
        qDebug() << v;
    });

    lay->addWidget(new QCheckBox("check box"));


    lay->addWidget(combo = new QComboBox());
    combo->addItem("Select item1");
    combo->addItem("Select item2");
    combo->setEditable(true);
    connect(combo, SIGNAL(currentIndexChanged(QString)), this, SLOT(slotComboBoxIndexChanged(QString)));

    combo->setCompleter(new QCompleter(combo->model()));

    lay->addWidget(edit = new QTextEdit);
    edit->setText(""
                  ""
                  ""
                  "
head1
head2
value1
value2
value3
value4
"
                  "");
    _edit = edit;
    connect(edit, &QTextEdit::textChanged, [&](){
     //   QTextEdit* edit = (QTextEdit*)this->sender();
        qDebug() << _edit->toPlainText();
    });
    edit->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);
    edit->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

    lay->addWidget(group = new QGroupBox("Some items"));
    QHBoxLayout* hBoxLay;
    group->setLayout(hBoxLay = new QHBoxLayout);
    hBoxLay->addWidget(new QPushButton("aaaa"));
    hBoxLay->addWidget(new QPushButton("aaaa"));

    QSlider* slider;
    QSpinBox* spinBox;

    lay->addWidget(slider = new QSlider(Qt::Horizontal));
    slider->setMaximum(100);
    slider->setMinimum(0);

    lay->addWidget(spinBox = new QSpinBox);
    spinBox->setMaximum(100);
    spinBox->setMinimum(0);

    connect(slider, SIGNAL(valueChanged(int)), spinBox, SLOT(setValue(int)));
    connect(spinBox, SIGNAL(valueChanged(int)), slider, SLOT(setValue(int)));

    lay->addWidget(new QDateTimeEdit);

    QLCDNumber* lcd;
    lay->addWidget(lcd = new QLCDNumber(10));
    lcd->display(12345);
    lcd->setMode(QLCDNumber::Hex);
    lcd->setSegmentStyle(QLCDNumber::Outline);
}

void MyWidget::slotComboBoxIndexChanged(const QString &str)
{
    qDebug() << "slotComboBoxIndexChanged" << str;
}

int main(int argc, char** argv)
{
    QApplication app(argc, argv);

    MyWidget w;
    w.show();

    return app.exec();
}