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 <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

.cpp 文件

#include "MyWidget.h"
#include <QApplication>

#include <QLabel>     // disply static text, or image
#include <QPushButton>
#include <QLineEdit> // single line

#include <QComboBox>
#include <QCheckBox>
#include <QRadioButton>
#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>
#include <QDebug>
#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;

lay->addWidget(label = new QLabel("<a href=www.baidu.com>baidu</a>"));
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("<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();
});
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();
}