Diplom_B/ZakForm.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Diplom_B.DB;

namespace Diplom_B
{
	public partial class ZakForm : Form
	{
		private Task errDrop;
		private void ShowError(string msg = null)
		{
			errorLabel.Text = string.IsNullOrEmpty(msg) ? "Неизвестная ошибка." : msg;
			errorLabel.Visible = true;
			errDrop = new Task(() =>
			{
				var fd = errDrop.Id;
				Task.Delay(5000).Wait();
				if (errDrop.Id == fd)
					if (InvokeRequired) Invoke((Action)(() => { errorLabel.Visible = false; }));
					else errorLabel.Visible = false;
			});
			errDrop.Start();
		}

		private void ClearBoxes()
		{
			idLabel.Text = "";
			nameBox.Text = "";
			adressBox.Text = "";
			phoneBox.Text = "";
			emailBox.Text = "";
		}
		private void UpdateZakTable(Zakazchik[] arr, bool reset_cursor = false)
		{
			var selected = (!reset_cursor && zakGridView.SelectedRows.Count > 0) ? zakGridView.SelectedRows[0].Index : -1;
			{
				var r = zakGridView.Rows;
				while (r.Count > 0)
					r.Remove(r[0]);
				var c = zakGridView.Columns;
				while (c.Count > 0)
					c.Remove(c[0]);
			}
			{
				var c = zakGridView.Columns;
				c.Add("Id", "№");
				c["Id"].Width = 40;
				c.Add("Name", "Наименование");
				c["Name"].Width = 120;
				c.Add("Adress", "Адрес");
				c["Adress"].Width = 120;
				c["Adress"].DefaultCellStyle.WrapMode = DataGridViewTriState.True;
				c.Add("Phone", "Телефон");
				c["Phone"].Width = 100;
				c.Add("Email", "Эл. почта");
				c["Email"].Width = 100;
			}
			{
				var r = zakGridView.Rows;
				foreach (var zak in arr)
					r.Add(new object[] {
						zak.Id,
						zak.Name,
						zak.Adress,
						zak.Phone,
						zak.Email
					});
			}
			if (zakGridView.Rows.Count > 0)
				zakGridView.Rows[0].Selected = true;
			if (selected != -1 && selected < zakGridView.Rows.Count)
				for (var i = 0; i < zakGridView.Rows.Count; i++)
					zakGridView.Rows[i].Selected = (i == selected);
			zakGridView_CurrentCellChanged(this, new EventArgs());
		}

		public ZakForm()
		{
			InitializeComponent();
			try { UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text)); }
			catch { ShowError(); }
		}

		private void zakGridView_CurrentCellChanged(object sender, EventArgs e)
		{
			ClearBoxes();
			if (zakGridView.SelectedRows.Count != 1)
				return;
			{
				var zak = WorkDB.GetZakazchik((int)zakGridView.SelectedRows[0].Cells[0].Value);
				if (zak == null)
					return;
				idLabel.Text = zak.Id.ToString();
				nameBox.Text = zak.Name;
				adressBox.Text = zak.Adress;
				phoneBox.Text = zak.Phone;
				emailBox.Text = zak.Email;
			}
		}

		private Task filterDrop;
		private void searchBox_TextChanged(object sender, EventArgs e)
		{
			filterDrop = new Task(() =>
			{
				var fd = filterDrop.Id;
				Task.Delay(1000).Wait();
				if (filterDrop.Id == fd)
					if (InvokeRequired) Invoke((Action)(() => { UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text)); }));
					else UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text));
			});
			filterDrop.Start();
		}
		private void resetSearchButton_Click(object sender, EventArgs e)
		{
			searchBox.Text = "";
			filterDrop = new Task(() => { return; });
			UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text));
		}

		private void createZakButton_Click(object sender, EventArgs e)
		{
			try
			{
				var r = new Zakazchik()
				{
					Name = nameBox.Text,
					Adress = adressBox.Text,
					Phone = phoneBox.Text,
					Email = emailBox.Text
				};
				WorkDB.AddZakazchik(r);
				UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text));
			}
			catch { ShowError(); }
		}
		private void changeZakButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Заказчик не выбран."); return; }
			var zak = WorkDB.GetZakazchik(idRes);
			if (zak == null) { ShowError("Нет заказчика в БД."); return; }
			try
			{
				zak.Name = nameBox.Text;
				zak.Adress = adressBox.Text;
				zak.Phone = phoneBox.Text;
				zak.Email = emailBox.Text;
				WorkDB.ChangeZakazchik(zak);
			}
			catch { ShowError(); }
			UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text));
		}
		private void deleteZakButton_Click(object sender, EventArgs e)
		{
			if (!int.TryParse(idLabel.Text, out int idRes)) { ShowError("Заказчик не выбран."); return; }
			var zak = WorkDB.GetZakazchik(idRes);
			if (zak == null) { ShowError("Заказчик не существует."); return; }
			try { WorkDB.DeleteZakazchik(zak); }
			catch { ShowError(); }
			UpdateZakTable(WorkDB.ListZakazchik(searchBox.Text));
		}
		private void resetZakButton_Click(object sender, EventArgs e)
		{
			ClearBoxes();
		}
	}
}