嵌入式Qt 制作一个登录对话框

一.登录对话框需求分析

二.代码实现

main.c：

#include <QtGui/QApplication>
#include "widget.h"int main(int argc, char *argv[])
{QApplication a(argc, argv);Widget w;w.show();return a.exec();
}

Widget.h：

#ifndef _WIDGET_H_
#define _WIDGET_H_#include <QtGui/QWidget>
#include <QPushButton>class Widget : public QWidget
{Q_OBJECT
private:QPushButton TestBtn;
private slots:void TestBtn_Clicked();
public:Widget(QWidget *parent = 0);~Widget();
};#endif

Widget.cpp：

#include "Widget.h"
#include "QLoginDialog.h"#include <QDebug>Widget::Widget(QWidget *parent) : QWidget(parent), TestBtn(this)
{TestBtn.setText("Test Login Dialog");setFixedSize(200, 50);connect(&TestBtn, SIGNAL(clicked()), this, SLOT(TestBtn_Clicked()));
}void Widget::TestBtn_Clicked()
{QLoginDialog dlg;if( dlg.exec() == QDialog::Accepted ){qDebug() << "User: " + dlg.getUser();qDebug() << "Pwd: " + dlg.getPwd();}
}Widget::~Widget()
{}

QLoginDialog.h :

#ifndef _QLOGINDIALOG_H_
#define _QLOGINDIALOG_H_#include <QtGui/QDialog>
#include <QLabel>
#include <QLineEdit>
#include <QPushButton>class QLoginDialog : public QDialog
{Q_OBJECT
private:QLabel UserLabel;QLabel PwdLabel;QLineEdit UserEdit;QLineEdit PwdEdit;QPushButton LoginBtn;QPushButton CancelBtn;QString m_user;QString m_pwd;
private slots:void LoginBtn_Clicked();void CancelBtn_Clicked();
public:QLoginDialog(QWidget *parent = 0);QString getUser();QString getPwd();~QLoginDialog();
};#endif

QLoginDialog.c:

#include "QLoginDialog.h"#include <QDebug>QLoginDialog::QLoginDialog(QWidget* parent) : QDialog(parent, Qt::WindowCloseButtonHint),UserLabel(this), PwdLabel(this), UserEdit(this), PwdEdit(this), LoginBtn(this), CancelBtn(this)
{UserLabel.setText("User ID:");UserLabel.move(20, 30);UserLabel.resize(60, 25);UserEdit.move(85, 30);UserEdit.resize(180, 25);PwdLabel.setText("Password:");PwdLabel.move(20, 65);PwdLabel.resize(60,25);PwdEdit.move(85, 65);PwdEdit.resize(180, 25);PwdEdit.setEchoMode(QLineEdit::Password);CancelBtn.setText("Cancel");CancelBtn.move(85, 110);CancelBtn.resize(85, 30);LoginBtn.setText("Login");LoginBtn.move(180, 110);LoginBtn.resize(85, 30);setWindowTitle("Login");setFixedSize(285, 170);connect(&LoginBtn, SIGNAL(clicked()), this, SLOT(LoginBtn_Clicked()));connect(&CancelBtn, SIGNAL(clicked()), this, SLOT(CancelBtn_Clicked()));
}void QLoginDialog::LoginBtn_Clicked()
{qDebug() << "LoginBtn_Clicked() Begin";m_user = UserEdit.text().trimmed();m_pwd = PwdEdit.text();done(Accepted);qDebug() << "LoginBtn_Clicked() End";
}void QLoginDialog::CancelBtn_Clicked()
{qDebug() << "CancelBtn_Clicked() Begin";done(Rejected);qDebug() << "CancelBtn_Clicked() End";
}QString QLoginDialog::getUser()
{return m_user;
}QString QLoginDialog::getPwd()
{return m_pwd;
}QLoginDialog::~QLoginDialog()
{}

运行结果：