/// <summary>
/// Get median price
/// </summary>
/// <returns></returns>
public double GetMedianPrice()
{
//The product list always needs to be sorted by price in asc order before the calculation
if (this.NumberOfProducts == 0)
{
return(0);
}
else if (this.NumberOfProducts == 1)
{
return(this.productList[0].RetailPrice);
}
//To calculate median price, create a copy of the list and sort by price in asc order before the calculation.
ProductCatalogue cata = new ProductCatalogue(string.Empty, Categories.Unknown);
List <ProductData> medianList = new List <ProductData>();
medianList.AddRange(this.productList);
cata.productList = medianList;
cata.Sort(SortType.RetailPrice, SortOrder.Ascending);
int middle = medianList.Count / 2;
if (medianList.Count % 2 == 0)
{
//When the number of product is even.
double median1 = medianList[middle - 1].RetailPrice;
double median2 = medianList[middle].RetailPrice;
return((median1 + median2) / 2);
}
else
{
return(medianList[middle].RetailPrice);
}
}
/// <summary>
/// Add product button click event handler
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnAddProduct_Click(object sender, EventArgs e)
{
if (!this.ExistCatalogue())
{
MessageBox.Show(AppResources.MSG_NO_CATALOGUES, AppResources.MSG_CAP_ERROR,
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (LboxCatalogList.SelectedIndex < 0)
{
MessageBox.Show(AppResources.MSG_SELECT_CATALOGUE, AppResources.MSG_CAP_ERROR,
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
FormAddProduct frmAdd = new FormAddProduct();
if (frmAdd.ShowDialog() != DialogResult.OK)
{
//if user cancels
return;
}
ProductCatalogue cata = this.GetSelectedCatalogue();
ProductData data = new ProductData(frmAdd.ProductName, frmAdd.RetailPrice);
cata.InsertProduct(data);
//sort product by selected sort type and order
cata.Sort(this.GetSortType(), this.GetSortOrder());
this.BsGridSource_DataSourceChanged(null, null);
this.ShowMedianPrice(cata);
//this.ClearNewProductInputPanel();
}
/// <summary>
/// Create catalogue button click event handler.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnCreateCatalogue_Click(object sender, EventArgs e)
{
FormCreateCatalogue frmCata = new FormCreateCatalogue();
if (frmCata.ShowDialog() != DialogResult.OK)
{
//if user cancels
return;
}
//create new catalogue
ProductCatalogue newCata = new ProductCatalogue(frmCata.CatalogueName, frmCata.Category);
catalogueList.Add(newCata);
// sort the catalogue list after added
catalogueList.Sort(delegate(ProductCatalogue cata1, ProductCatalogue cata2)
{
//compare with the names
return(cata1.CatalogueName.CompareTo(cata2.CatalogueName));
});
this.InitializeCatalogueListBox();
//Find the index to get newly added item selected in the list box.
int index = catalogueList.FindIndex(delegate(ProductCatalogue cata)
{
//Since multiple catalogues that have the same names can be added,
//Equals() method needs to be used to find newly added object.
return(cata.Equals(newCata));
});
}
/// <summary>
/// Remove catalogue button click event handler.
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void BtnRemoveCatalogue_Click(object sender, EventArgs e)
{
//catalogue existance check
if (!this.ExistCatalogue())
{
MessageBox.Show(AppResources.MSG_NO_CATALOGUES, AppResources.MSG_CAP_ERROR,
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
if (LboxCatalogList.SelectedIndex < 0)
{
MessageBox.Show(AppResources.MSG_CATE_SELECTED_TO_DELETE, AppResources.MSG_CAP_ERROR,
MessageBoxButtons.OK, MessageBoxIcon.Error);
return;
}
//ProductCatalogue cata = catalogueList[LboxCatalogList.SelectedIndex];
ProductCatalogue cata = this.GetSelectedCatalogue();
//confirmation message
if (MessageBox.Show(AppResources.MSG_ASK_DELETE_CATA, AppResources.MSG_CAP_CONF,
MessageBoxButtons.OKCancel, MessageBoxIcon.Question) != DialogResult.OK)
{
//if user cancels.
return;
}
//remove the catalogue and clear the data grid
catalogueList.RemoveAt(LboxCatalogList.SelectedIndex);
this.InitializeCatalogueListBox();
if (LboxCatalogList.Items.Count != 0)
{
LboxCatalogList.SelectedIndex = 0;
}
}
/// <summary>
/// Show median price on the window.
/// </summary>
/// <param name="cata"></param>
private void ShowMedianPrice(ProductCatalogue cata)
{
if (cata == null)
{
return;
}
string medPerCata = cata.GetMedianPrice().ToString();
string medAcrossCata = this.GetMedianPriceAcrossCatalogues().ToString();
TboxCatalogueMedian.Text = medPerCata;
TboxAllMedian.Text = medAcrossCata;
}
/// <summary>
/// Sort_CheckedChanged event handler
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void Sort_CheckedChanged(object sender, EventArgs e)
{
ProductCatalogue cata = GetSelectedCatalogue();
if (cata == null)
{
return;
}
cata.Sort(this.GetSortType(), this.GetSortOrder());
//To show sorted result, call the event.
this.BsGridSource_DataSourceChanged(null, null);
}
/// <summary>
/// Get median price across all catalogues.
/// </summary>
/// <returns></returns>
private double GetMedianPriceAcrossCatalogues()
{
if (catalogueList == null || catalogueList.Count == 0)
{
return(0);
}
ProductCatalogue cataAll = new ProductCatalogue(AppResources.NAME_CALC_MEDIAN_CATA_LIST_NAME, Categories.Unknown);
foreach (ProductCatalogue cata in catalogueList)
{
cataAll.ProductList.AddRange(cata.ProductList);
}
return(cataAll.GetMedianPrice());
}
/// <summary>
/// Catalogue list box SelectedValueChanged event handler
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void LboxCatalogList_SelectedValueChanged(object sender, EventArgs e)
{
if (this.LboxCatalogList.SelectedIndex < 0)
{
return;
}
//ProductCatalogue cata = catalogueList[LboxCatalogList.SelectedIndex];
ProductCatalogue cata = this.GetSelectedCatalogue();
//sort product by selected sort type and order
cata.Sort(this.GetSortType(), this.GetSortOrder());
//Show all products in the data grid
// When datasource is changed, the (BindingSource) event will be occured,
// then the event shows all products in the catalogue.
this.BsGridSource.DataSource = cata.ProductList;
//show catalogue name and median price
this.TboxCategory.Text = cata.Category.ToString();
this.TboxCatalogueName.Text = cata.CatalogueName;
this.ShowMedianPrice(cata);
}
