ServerControl : GridView Pager
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Drawing;
namespace Bruce.Web.Controls
{
/// <summary>
/// GridViewPager 的摘要描述
/// </summary>
[ToolboxData("<{0}:GridViewPager ID=\"GridViewPager\" runat=\"server\"></{0}:GridViewPager>")]
public class GridViewPager : Control
{
#region 按鈕文字
private string _FirstPageText = "第一頁";
public string FirstPageText
{
get { return _FirstPageText; }
set { _FirstPageText = value; }
}
private string _PreviousPageText = "上一頁";
public string PreviousPageText
{
get { return _PreviousPageText; }
set { _PreviousPageText = value; }
}
private string _NextPageText = "下一頁";
public string NextPageText
{
get { return _NextPageText; }
set { _NextPageText = value; }
}
private string _LastPageText = "最後頁";
public string LastPageText
{
get { return _LastPageText; }
set { _LastPageText = value; }
}
#endregion
/// <summary>
/// 使用圖示按鈕
/// </summary>
private bool _IsImageButton;
public bool IsImageButton
{
get { return _IsImageButton; }
set { _IsImageButton = value; }
}
#region 按鈕圖示
private string _FirstPageImageUrl;
public string FirstPageImageUrl
{
get { return _FirstPageImageUrl; }
set { _FirstPageImageUrl = value; }
}
private string _PreviousPageImageUrl;
public string PreviousPageImageUrl
{
get { return _PreviousPageImageUrl; }
set { _PreviousPageImageUrl = value; }
}
private string _NextPageImageUrl;
public string NextPageImageUrl
{
get { return _NextPageImageUrl; }
set { _NextPageImageUrl = value; }
}
private string _LastPageImageUrl;
public string LastPageImageUrl
{
get { return _LastPageImageUrl; }
set { _LastPageImageUrl = value; }
}
#endregion
/// <summary>
/// 使用下拉選單
/// </summary>
private bool _IsDropDownList;
public bool IsDropDownList
{
get { return _IsDropDownList; }
set { _IsDropDownList = value; }
}
/// <summary>
/// 顯示頁碼個數
/// </summary>
private int _PagerRange = 3;
public int PagerRange
{
get { return _PagerRange; }
set
{
if (value < 1)
{
_PagerRange = 1;
}
else if (value > 10)
{
_PagerRange = 10;
}
else
{
_PagerRange = value;
}
}
}
/// <summary>
/// 頁碼間隔
/// </summary>
private string _PagerPadding = "3px";
public string PagerPadding
{
get { return _PagerPadding; }
set { _PagerPadding = value; }
}
/// <summary>
/// 文字顏色
/// </summary>
private Color _ForeColor;
public Color ForeColor
{
get { return _ForeColor; }
set { _ForeColor = value; }
}
private Control indexer = new Control();
private GridView container;
protected override void OnLoad(EventArgs e)
{
if (this.CheckContainer())
{
this.Controls.Clear();
#region 設定按鈕屬性
if (IsImageButton)
{
ImageButton btnFirstPage = CreateImageButton("btnFirstPage",
FirstPageText,
"0",
container.PageIndex > 0,
this.FirstPageImageUrl);
ImageButton btnPreviousPage = CreateImageButton("btnPreviousPage",
PreviousPageText,
(container.PageIndex - 1).ToString(),
container.PageIndex - 1 >= 0,
this.PreviousPageImageUrl);
ImageButton btnNextPage = CreateImageButton("btnNextPage",
NextPageText,
(container.PageIndex + 1).ToString(),
container.PageIndex + 1 < container.PageCount,
this.NextPageImageUrl);
ImageButton btnLastPage = CreateImageButton("btnLastPage",
LastPageText,
(container.PageCount - 1).ToString(),
container.PageIndex + 1 < container.PageCount,
this.LastPageImageUrl);
this.Controls.Add(btnFirstPage);
this.Controls.Add(btnPreviousPage);
this.Controls.Add(this.indexer);
this.Controls.Add(btnNextPage);
this.Controls.Add(btnLastPage);
}
else
{
LinkButton btnFirstPage = CreatePageButton("btnFirstPage",
FirstPageText,
"0",
container.PageIndex > 0);
LinkButton btnPreviousPage = CreatePageButton("btnPreviousPage",
PreviousPageText,
(container.PageIndex - 1).ToString(),
container.PageIndex - 1 >= 0);
LinkButton btnNextPage = CreatePageButton("btnNextPage",
NextPageText,
(container.PageIndex + 1).ToString(),
container.PageIndex + 1 < container.PageCount);
LinkButton btnLastPage = CreatePageButton("btnLastPage",
LastPageText,
(container.PageCount - 1).ToString(),
container.PageIndex + 1 < container.PageCount);
this.Controls.Add(btnFirstPage);
this.Controls.Add(btnPreviousPage);
this.Controls.Add(this.indexer);
this.Controls.Add(btnNextPage);
this.Controls.Add(btnLastPage);
}
#endregion
if (IsDropDownList)
this.RenderDrowDownListPager();
else
this.RenderPageNumbers();
}
base.OnLoad(e);
}
/// <summary>
/// 位置錯誤時顯示錯誤訊息
/// </summary>
/// <param name="e"></param>
protected override void OnPreRender(EventArgs e)
{
if (!this.CheckContainer())
{
this.Controls.Clear();
Literal warming = new Literal();
warming.Text = "<span style=\"color:red;\">Pager object must be in a GridView.<span>";
this.Controls.Add(warming);
}
base.OnPreRender(e);
}
/// <summary>
/// 檢查container
/// </summary>
/// <returns></returns>
private bool CheckContainer()
{
if (container == null)
{
Control control = this;
while (control.Parent != null && !(control.Parent is GridView))
{
control = control.Parent;
}
if (control.Parent != null)
{
container = control.Parent as GridView;
return true;
}
else
{
return false;
}
}
else
{
return true;
}
}
/// <summary>
/// 建立圖形按鈕
/// </summary>
/// <param name="ID"></param>
/// <param name="AlternateText"></param>
/// <param name="CommandArgument"></param>
/// <param name="Visible"></param>
/// <param name="ImageUrl"></param>
/// <returns></returns>
private ImageButton CreateImageButton(string ID, string AlternateText, string CommandArgument, bool Visible, string ImageUrl)
{
ImageButton btn = new ImageButton();
btn.ID = ID;
btn.AlternateText = AlternateText;
btn.CommandArgument = CommandArgument;
btn.ImageUrl = ImageUrl;
btn.Visible = Visible;
btn.ImageAlign = ImageAlign.Middle;
btn.Click += PageButton_Click;
btn.Style["margin-left"] = this.PagerPadding;
btn.Style["margin-right"] = this.PagerPadding;
return btn;
}
/// <summary>
/// 建立文字按鈕
/// </summary>
/// <param name="ID"></param>
/// <param name="Text"></param>
/// <param name="CommandArgument"></param>
/// <param name="Visible"></param>
/// <returns></returns>
private LinkButton CreatePageButton(string ID, string Text, string CommandArgument, bool Visible)
{
LinkButton btn = new LinkButton();
btn.ForeColor = this.ForeColor;
btn.ID = ID;
btn.Text = Text;
btn.CommandArgument = CommandArgument;
btn.Visible = Visible;
btn.Click += PageButton_Click;
btn.Style["margin-left"] = this.PagerPadding;
btn.Style["margin-right"] = this.PagerPadding;
return btn;
}
/// <summary>
/// 處理頁碼
/// </summary>
private void RenderPageNumbers()
{
int start = Math.Max(0, this.container.PageIndex - this.PagerRange);
int end = Math.Min(this.container.PageCount - 1, this.container.PageIndex + this.PagerRange);
for (int i = start; i <= end; i++)
{
if (i == this.container.PageIndex)
{
Literal currentPage = new Literal();
currentPage.Text = (i + 1).ToString();
this.indexer.Controls.Add(currentPage);
}
else
{
this.indexer.Controls.Add(CreatePageButton("p" + i, (i + 1).ToString(), i.ToString(), true));
}
}
}
/// <summary>
/// 處理下拉選單
/// </summary>
private void RenderDrowDownListPager()
{
DropDownList ddl = this.indexer.FindControl("ddlPageSelector") as DropDownList;
if (ddl == null)
{
ddl = new DropDownList();
ddl.ID = "ddlPageSelector";
ddl.AutoPostBack = true;
ddl.SelectedIndexChanged += PageList_Select;
Literal txt = new Literal();
txt.Text = "第";
this.indexer.Controls.Add(txt);
this.indexer.Controls.Add(ddl);
txt = new Literal();
txt.Text = "頁";
this.indexer.Controls.Add(txt);
}
if (ddl.Items.Count == 0)
{
for (int i = 0; i < this.container.PageCount; i++)
{
ddl.Items.Add(new ListItem((i + 1).ToString(), i.ToString()));
}
}
ddl.SelectedValue = this.container.PageIndex.ToString();
}
/// <summary>
/// 換頁動作
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void PageButton_Click(object sender, EventArgs e)
{
if (this.CheckContainer())
{
LinkButton btn = sender as LinkButton;
if (btn != null)
this.container.PageIndex = int.Parse(btn.CommandArgument);
ImageButton ibtn = sender as ImageButton;
if (ibtn != null)
this.container.PageIndex = int.Parse(ibtn.CommandArgument);
}
}
/// <summary>
/// 換頁動作
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void PageList_Select(object sender, EventArgs e)
{
if (this.CheckContainer())
{
DropDownList ddl = sender as DropDownList;
this.container.PageIndex = int.Parse(ddl.SelectedValue);
}
}
}
}
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