Qt学习笔记之一，登录界面。

今天完成了第一个Qt项目，登录界面。

环境：Qt5.1 Ubuntu 12.04 LTS

效果：

代码：

#include "mainwindow.h"
#include "ui_mainwindow.h"

CLoginDlg::CLoginDlg(QWidget *parent) :
    QDialog(parent)
{
    QLabel* usrLabel = new QLabel(tr("user name:"));
    QLabel* pwdLabel = new QLabel(tr("password:"));
    usrLineEdit = new QLineEdit;
    pwdLineEdit = new QLineEdit;
    pwdLineEdit->setEchoMode(QLineEdit::Password);

    QGridLayout* gridLayout = new QGridLayout;
    gridLayout->addWidget(usrLabel,0,0,1,1);
    gridLayout->addWidget(pwdLabel,1,0,1,1);
    gridLayout->addWidget(usrLineEdit,0,1,1,3);
    gridLayout->addWidget(pwdLineEdit,1,1,1,3);

    QPushButton* okBtn = new QPushButton(tr("OK"));
    QPushButton* cancelBtn = new QPushButton(tr("Cancel"));
    QHBoxLayout* hBoxLayout = new QHBoxLayout;
    hBoxLayout->setSpacing(60);
    hBoxLayout->addWidget(okBtn);
    hBoxLayout->addWidget(cancelBtn);

    QVBoxLayout* vBoxLayout = new QVBoxLayout;
    vBoxLayout->setMargin(40);
    vBoxLayout->addLayout(gridLayout);
    vBoxLayout->addStretch(60);
    vBoxLayout->addLayout(hBoxLayout);

    setLayout(vBoxLayout);

    QObject::connect(okBtn, SIGNAL(clicked()), this, SLOT(accept()));
    QObject::connect(cancelBtn, SIGNAL(clicked()), this, SLOT(reject()));

    setWindowTitle("login");
    resize(300,200);
}

void CLoginDlg::accept()
{
    if(usrLineEdit->text().trimmed() == tr("duan") && pwdLineEdit->text() == tr("duan"))
    {
        QMessageBox::warning(this,tr("Success!"),usrLineEdit->text(),QMessageBox::Cancel,QMessageBox::Yes);
        QDialog::accept();      //success
    }
    else
    {
        QMessageBox::warning(this,tr("Warning!"),tr("The username or the password is wrong"),QMessageBox::Cancel,QMessageBox::Yes);
        usrLineEdit->clear();
        pwdLineEdit->clear();
        usrLineEdit->setFocus();
        QDialog::reject();
    }
}

CLoginDlg::~CLoginDlg()
{
    delete usrLineEdit;
    delete pwdLineEdit;
}

继续加油！