MyWidget.h

#ifndef MYWIDGET_H

#define MYWIDGET_H

#include <QWidget>

#include <QTextEdit>

class MyWidget : public QWidget

{

    Q_OBJECT

public:

    explicit MyWidget(QWidget *parent = 0);

    QTextEdit* _edit;

signals:

public slots:

    void slotComboBoxIndexChanged(const QString&);

};

#endif // MYWIDGET_H

05Controls.pro文件的内容

HEADERS += \

    MyWidget.h

SOURCES += \

    MyWidget.cpp

QT += widgets gui

CONFIG += C++11

MyWidget.cpp

#include"MyWidget.h"

#include<QApplication>

#include<QLabel>        //displystatictext,orimage

#include<QPushButton>

#include<QLineEdit>     //singleline

#include<QComboBox>     //下拉选

#include<QCheckBox>     //复选框

#include<QRadioButton>  //单选按钮

#include<QTextEdit>     //multilines,richtext

#include<QTextBrowser>  //readonlytextedit

#include<QGroupBox>

#include<QSlider>       //模拟方式显示数值

#include<QSpinBox>      //数字

#include<QDateEdit>

#include<QTimeEdit>

#include<QDateTimeEdit>

#include<QTabWidget>    //不介绍,不算控件

#include<QCompleter>

#include<QHBoxLayout>   //布局控件

#include<QDebug>        //这里用于测试用

#include<QPixmap>

#include<QVBoxLayout>

#include<QLCDNumber>

MyWidget::MyWidget(QWidget*parent):

   QWidget(parent)

{

   QVBoxLayout*lay=newQVBoxLayout(this);

   QLabel*label;

   QComboBox*combo;

   QPushButton*button;

   QRadioButton*radio;

   QTextEdit*edit;

   QGroupBox*group;

   //说明可以通过编写样式的方式修改GUI中字体的样式

   lay->addWidget(label=newQLabel("<ahref=http://www.mamicode.com/www.baidu.com>百度</a>"));

   //通过下面一句在lable上添加一个图片,当加了下面一句之后，上面的baidu字就会被覆盖

   //label->setPixmap(QPixmap("../aaa.png"));

   //当选中了lable之后会，输出字符串

   connect(label,&QLabel::linkActivated,[](QStringstr){

       qDebug()<<str;

   });

   lay->addWidget(button=newQPushButton("Button"));

   //为button添加样式

   button->setStyleSheet("QPushButton{font:bold16px;color:red;padding:5px}");

   lay->addWidget(radio=newQRadioButton("Radio"));

   radio->setStyleSheet("QRadioButton{font:bold16px;color:red;padding:5px}");

   //为单选按钮添加事件，true或者false

   connect(radio,&QRadioButton::clicked,[](boolv){

       qDebug()<<v;

   });

   lay->addWidget(newQCheckBox("checkbox"));

   //添加下拉选

   lay->addWidget(combo=newQComboBox());

   combo->addItem("Selectitem1");

   combo->addItem("Selectitem2");

   //设置下拉选可以被编辑

   combo->setEditable(true);

   //当下拉选selectChanged之后，用信号槽进行处理

   connect(combo,SIGNAL(currentIndexChanged(QString)),this,SLOT(slotComboBoxIndexChanged(QString)));

   combo->setCompleter(newQCompleter(combo->model()));

   //说明多行文本框之中可以使用html标签页面

   lay->addWidget(edit=newQTextEdit);

   edit->setText("<tableborder=1><tr><th>head1</th><th>head2</th></tr>"

                 "<tr><td>value1</td><td>value2</td></tr>"

                 "<tr><td>value3</td><td>value4</td></tr>"

                 "</table><br>"

                 "<imgsrc=http://www.mamicode.com/aaa.png>");

   _edit=edit;

   connect(edit,&QTextEdit::textChanged,[&](){

    //  QTextEdit*edit=(QTextEdit*)this->sender();

       qDebug()<<_edit->toPlainText();

   });

   //设置竖直方向上有水平滚动条

   edit->setVerticalScrollBarPolicy(Qt::ScrollBarAsNeeded);

   //设置水平方向上没有滚动条

   edit->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);

   lay->addWidget(group=newQGroupBox("Someitems"));

   QHBoxLayout*hBoxLay;

   group->setLayout(hBoxLay=newQHBoxLayout);

   hBoxLay->addWidget(newQPushButton("aaaa"));

   hBoxLay->addWidget(newQPushButton("aaaa"));

   QSlider*slider;

   QSpinBox*spinBox;

   lay->addWidget(slider=newQSlider(Qt::Horizontal));

   slider->setMaximum(100);

   slider->setMinimum(0);

   lay->addWidget(spinBox=newQSpinBox);

   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(newQDateTimeEdit);

   //设置LCD样式的显示状态

   QLCDNumber*lcd;

   lay->addWidget(lcd=newQLCDNumber(10));

   lcd->display(12345);

   lcd->setMode(QLCDNumber::Hex);

   lcd->setSegmentStyle(QLCDNumber::Outline);

}

voidMyWidget::slotComboBoxIndexChanged(constQString&str)

{

   qDebug()<<"slotComboBoxIndexChanged"<<str;

}

intmain(intargc,char**argv)

{

   QApplicationapp(argc,argv);

   MyWidgetw;

   w.show();

   returnapp.exec();

}

运行结果：