GenericListPage.cs :  » Persistence-Frameworks » Data-Holder » DBWebControls » Controls » C# / CSharp Open Source

using System;
using System.ComponentModel;
using System.Web.UI;
using System.Web.UI.WebControls;
using DataHolder.Containers;
using DataHolder.DataPersistence;
using System.Text;

namespace DBWebControls.Controls{
  /// <summary>
  /// Summary description for GenericListPage.
  /// </summary>
  public class GenericListPage :System.Web.UI.Page
  {
    private DataGrid MainDataGrid;
    private ControlsBinder filterControls;
    private Button FilterButton; 
    private TextBox itemsPerPage;

    protected WebNavigator.NavListPageState CurrentPage;
    protected WebNavigator.PageNavigator Navigator;
    
    public void InitListPage( DataGrid p_MainDataGrid, ControlsBinder p_filterControls, Button p_FilterButton, TextBox p_itemsPerPage)
    {
      MainDataGrid = p_MainDataGrid;
      filterControls = p_filterControls;
      FilterButton = p_FilterButton;
      itemsPerPage = p_itemsPerPage;

      FilterButton.Click +=new EventHandler(FilterData);
      MainDataGrid.SortCommand += new DataGridSortCommandEventHandler(MainDataGrid_SortCommand);
      MainDataGrid.PageIndexChanged += new DataGridPageChangedEventHandler(MainDataGrid_PageIndexChanged);
    }


    #region PageOverrides
    protected override void OnLoad(EventArgs e)
    {
      Navigator = WebNavigator.PageNavigator.GetNavigator(this);
      //because on web another web type is created
      CurrentPage = (WebNavigator.NavListPageState)Navigator[this.GetType().BaseType];

      base.OnLoad (e);
      if(!this.IsPostBack)
      {
        MainDataGrid.CurrentPageIndex = 0;
        BindDataGrid();
      }
      else
        filterControls.GetValuesFromControls(CurrentPage.ListState.GEfilters);
    }

    protected override void OnPreRender(EventArgs e)
    {
      filterControls.SetValuesToControls(CurrentPage.ListState.GEfilters);
      base.OnPreRender (e);
    }
    #endregion

    #region BindData

    public virtual void SetDataGridDataSource()
    {
      MainDataGrid.DataSource = CurrentPage.ListState.LoadedData;
      MainDataGrid.DataBind();
    }

    public virtual void BindDataGrid()
    {
      MainDataGrid.PageSize = int.Parse(itemsPerPage.Text);
      int RowsCount = 0;
      ColumnFilterInfoCollection cfi = CurrentPage.ListState.GetFilterValues();
      OrderByInfoCollection obi = CurrentPage.ListState.GetorderByInfo();
      GenericDataCollection gecoll = LoadDataPagedData(out RowsCount, cfi, obi, MainDataGrid.PageSize, MainDataGrid.CurrentPageIndex, 0);
      MainDataGrid.VirtualItemCount = RowsCount;
      CurrentPage.ListState.LoadedData = gecoll;    
      SetDataGridDataSource();
    }

    #endregion

    #region Events
    public virtual void FilterData(object sender, System.EventArgs e)
    {
      MainDataGrid.CurrentPageIndex = 0;
      BindDataGrid();
    }

    public virtual void MainDataGrid_SortCommand(object source, System.Web.UI.WebControls.DataGridSortCommandEventArgs e)
    {
      if(CurrentPage.ListState.SortColumn == e.SortExpression)
      {
        if(CurrentPage.ListState.SortDirection == ListSortDirection.Ascending)
          CurrentPage.ListState.SortDirection = ListSortDirection.Descending;
        else
          CurrentPage.ListState.SortDirection = ListSortDirection.Ascending;
      }
      else
      {
        CurrentPage.ListState.SortColumn = e.SortExpression;
        CurrentPage.ListState.SortDirection = ListSortDirection.Ascending;
      }
      BindDataGrid();
    }

    public virtual void MainDataGrid_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
    {
      MainDataGrid.CurrentPageIndex = e.NewPageIndex;
      BindDataGrid();
    }
    #endregion

    #region LoadData Abstracts
    public virtual GenericDataCollection LoadDataPagedData(out int RowsCount, ColumnFilterInfoCollection filters, OrderByInfoCollection orderinfo,int PageSize, int CurrentPageIndex, int EmptySpacesInPage)
    {
      throw new Exception("List Page Exception : LoadDataPagedData function not implemented");
    }
    #endregion

    #region ListUtils
    public void DataSelected(object Data, bool CloseWindow, bool PostBackParent)
    {
      if(CurrentPage.ItemSelected != null)
        CurrentPage.ItemSelected(CurrentPage, Data);
      StringBuilder sb = new StringBuilder(500);
      sb.Append("<script language=\"javascript\">\r\n");
            if(PostBackParent)
                 sb.Append("window.opener.document.forms[0].submit();\r\n");
      if(CloseWindow)
        sb.Append("window.close();\r\n"); 
      sb.Append("</script>");
      RegisterStartupScript("closewindow",sb.ToString());
    }
    #endregion
  }
}