private void Add2List(MenuItemForTag item, bool AtFirst)
{
if (item.No == 0)
{
Sub2List(item);
return;
}
ListViewItem lvItem = FindByProductID(item.productID);
double no = item.No;
double money = item.Money();
if (lvItem != null)
{
lvItem.SubItems[2].Text = no.ToString();
lvItem.SubItems[3].Text = money.ToString();;
}
else
{
if (item.classcode != MyConstant.CanDiscountClass)
{
if (AtFirst)
{
lvItem = lvNoDiscount.Items.Insert(0, item.productID.ToString());
}
else
{
lvItem = lvNoDiscount.Items.Add(item.productID.ToString());
}
}
else
{
if (AtFirst)
{
lvItem = lvCanDiscount.Items.Insert(0, item.productID.ToString());
}
else
{
lvItem = lvCanDiscount.Items.Add(item.productID.ToString());
}
}
lvItem.SubItems.Add(item.name);
lvItem.SubItems.Add(no.ToString());
lvItem.SubItems.Add(money.ToString());
}
lvItem.Tag = item;
CalcTotal();
}
// ListView的tag 指向MenuItem
private bool Sub2List(MenuItemForTag item)
{
ListViewItem lvItem = FindByProductID(item.productID);
if (lvItem == null)
{
return(false); // 沒東西刪
}
if (item.No > 0)
{
lvItem.SubItems[2].Text = item.NoToString();
lvItem.SubItems[3].Text = item.Money().ToString();
}
else
{
lvItem.Remove();
}
CalcTotal();
return(true); // 刪除成功
}
private double CalcTotal()
{
double total = 0;
double no = 0, sum = 0;
foreach (ListViewItem lvItem in lvNoDiscount.Items)
{
MenuItemForTag item = (MenuItemForTag)lvItem.Tag;
sum += item.Money();
no += item.No;
}
sum = Math.Round(sum, 1);
lvNoDiscount.Columns[2].Text = no.ToString();
lvNoDiscount.Columns[3].Text = sum.ToString();
total = sum;
sum = no = 0;
foreach (ListViewItem lvItem in lvCanDiscount.Items)
{
MenuItemForTag item = (MenuItemForTag)lvItem.Tag;
sum += item.Money();
no += item.No;
}
if (checkDiscount.Checked)
{
sum = sum * 0.88;
}
sum = Math.Round(sum, 0, MidpointRounding.AwayFromZero);
// sum = Math.Round(sum, 1); 銀行家捨入
lvCanDiscount.Columns[2].Text = no.ToString();
lvCanDiscount.Columns[3].Text = sum.ToString();
total += sum;
if (mtbDeduct.Text != "")
{
int deduct = Int32.Parse(mtbDeduct.Text);
total -= deduct;
}
total = Math.Round(total, 0, MidpointRounding.AwayFromZero);
labelTotal.Text = total.ToString();
return(total);
}