2.QLabel，QPushButton，QLineEdit，QComboBox，QCheckBox，QRadioButton，QTextEdit，QTextBrowser，QGroupBox，QSl


1.新建一个空项目（其它项目—>空QT项目）：

2 
添加新文件（选择C++Class）

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>        
//
disply
static
text,
or
image

#include
<QPushButton>

#include
<QLineEdit>     
//
single
line

#include
<QComboBox>     
//下拉选

#include
<QCheckBox>     
//复选框

#include
<QRadioButton>  
//单选按钮

#include
<QTextEdit>     
//
multi
lines,
rich
text

#include
<QTextBrowser>  
//
readonly
textedit

#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
=
new
QVBoxLayout(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
=
new
QLabel("<a
href=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,
[](QString
str){

       
qDebug()
<<
str;

   
});

   
lay->addWidget(button
=
new
QPushButton("Button"));

   
//为button添加样式

   
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}");

   
//为单选按钮添加事件，true或者false

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

       
qDebug()
<<
v;

   
});

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

   
//添加下拉选

   
lay->addWidget(combo
=
new
QComboBox());

   
combo->addItem("Select
item1");

   
combo->addItem("Select
item2");

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

   
//说明多行文本框之中可以使用html标签页面

   
lay->addWidget(edit
=
new
QTextEdit);

   
edit->setText("<table
border=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>"

                 
"<img
src=../aaa.png></img>");

   
_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
=
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);

   
//设置LCD样式的显示状态

   
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();

}

运行结果：