QT test01

简单的一个功能发送信息的窗口

#ifndef MYWIDGET_H
#define MYWIDGET_H

#include <QWidget>
#include <QLineEdit>
#include <QPushButton>
#include <QTextBrowser>
#include <QGridLayout>

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

    QLineEdit* _edit;
    QPushButton* _button;
    QTextBrowser* _browser;
    QGridLayout* _layout;
signals:

public slots:
    void slotButtonclicked();

};

#endif // MYWIDGET_H

//自己做的发送信息窗口
#include "MyWidget.h"
#include <QApplication>
#include <QDebug>
#include <QString>

MyWidget::MyWidget(QWidget *parent) : QWidget(parent)
{
    //一定要初始化
   _edit = new QLineEdit();
   _button = new QPushButton("send");
   _browser = new QTextBrowser();
   _layout = new QGridLayout();

   _layout->setColumnStretch(3,1);           //加上弹簧
   _layout->setRowStretch(3,1);
   _layout->setColumnStretch(0,1);
   _layout->setRowStretch(0,1);
   _layout->addWidget(_edit,1,1);
   _layout->addWidget(_button,1,2);
   _layout->addWidget(_browser,2,1,1,2);
   this->setLayout(_layout);

   connect(_button,SIGNAL(clicked()),
           this,SLOT(slotButtonclicked()));  //第二个参数是this
   connect(_edit,SIGNAL(returnPressed()),    //实现按住回车就触发信号
           this,SLOT(slotButtonclicked()));
}

void MyWidget::slotButtonclicked()
{
    //qDebug() << "123";
    QString str = _edit->text();
   if(str.isEmpty())
       return;
    _browser->setText(str.toUtf8());
}

int main(int argc,char* argv[])
{
    QApplication app(argc,argv);
    MyWidget w;

    w.show();

    return app.exec();

}