stlist.cpp

使用QT编写了简单的学生管理系统

#include "stlist.h"
//
#include <QMessageBox>
StList::StList(  ) 
{
	// TODO
  arraylength = 0;
  arraycurrent = 0;
}
void StList::append (const Student& item)//添加学生信息
{   
    if(arraylength == 100)
    {
    QMessageBox::warning (this, tr("Student Information"),
	tr("The maxinum of student information is 100!"));
	return ;	
   	}
	array[arraylength]= new Student(item.getNo(),item.getName(),item.getClass());
	arraylength = arraylength + 1;
	//添加成功
	QMessageBox::information (this, "Information Application",
	"The student information is added!");
    arraycurrent = arraylength-1;
}
void StList::next ()
{   //判断数组是否为空
	if(arraylength == 0)
	{
	QMessageBox::warning (this, tr("Information Application"),
	tr("There has no student information!"));
	return ;
	}
	//判断当前记录是否是最后的记录
	if(arraycurrent == arraylength-1)
		{
		QMessageBox::warning (this, tr("Information Application"),
		tr("This is the last one!"));
		return ;
	}
	setcurrenValue(arraycurrent+1);

}
/***************************************************************/
void StList::prev ()
{
   //判断数组是否为空
   if(arraylength == 0)
	{
	QMessageBox::warning (this, tr("Information Application"),
	tr("There has no student information!"));
	return ;
	}
	//判断数组是否是第一个记录
    if(arraycurrent == 0)
	{
		QMessageBox::warning (this, tr("Information Application"),
		tr("This is the frist one!"));
		return ;
	}
	setcurrenValue(arraycurrent-1);
	
}
//***************************************************************************
void StList::first()
{
	 //判断数组是否为空
   	if(arraylength == 0)
	{
	QMessageBox::warning (this, tr("Information Application"),tr("There has no student information!"));
	return ;
	}
	setcurrenValue(0);	
}
//****************************************************************************
void StList::last()
{
	 //判断数组是否为空
    if(arraylength == 0)
	{
	QMessageBox::warning (this, tr("Information Application"),
	tr("There has no student information!"));
	return ;
	}
	setcurrenValue(arraylength - 1);
}
bool StList::remove ()
{  //判断数组是否为空
  if(arraylength == 0)
	{
	QMessageBox::warning (this, tr("Information Application"),
	tr("There has no student information!"));
	return false;
	} 
	//确认是否要删除
   switch( QMessageBox::information( this, "Student Information",
        "Do you sure delete this record!\n",
        "Yes", "No",
        0,      // ok == button 0
        1 ) ) { // no == button 1
    case 0: // 按Yes则删除这个记录
        for(int n=arraylength-1;n>arraycurrent;n--)
        {
        	array[n-1] = array[n];
       	}
       	arraylength--;
       	if(arraylength == 0 )
       	{
       		QMessageBox::warning (this, tr("Information Application"),
	       tr("There has no student information!"));
	       return false;
      	}
       	if(arraycurrent == arraylength) setcurrenValue(arraycurrent - 1);
       	else setcurrenValue(arraycurrent + 1);
       		
        break;
    case 1: // 否则不删除退出
        return true;
      }
  	
}

void StList::setcurrenValue( int value )
{
	arraycurrent = value;
	//触发消息
	emit noChanged(array[value]->getNo());
	emit nameChanged(array[value]->getName());
	emit classChanged(array[value]->getClass()); 
}
void StList::setnoVale(int value)
{  
	emit noChanged(array[value]->getNo()); 
}
void StList::setnameVale(int value)
{  
	emit noChanged(array[value]->getName()); 
}
void StList::setclassVale(int value)
{   
 	emit noChanged(array[value]->getClass()); 
}
//