1
using System;
2using System.Text;
3using System.Text.RegularExpressions;
4using System.IO;
5using System.Web.UI;
6using System.Web.UI.WebControls;
7using System.Web.UI.HtmlControls;
8using NetFocus.Web.Core;
9
10namespace NetFocus.Web.Applications.PersonalBlog
11
...{
12
public class Pager : Label, IPagedControl, INamingContainer
13
...{
14 Member variables and constructor#region Member variables and constructor
15
16 private WebContext csContext = WebContext.Current;
17 private HyperLink previousLink;
18 private HyperLink nextLink;
19 private HyperLink firstLink;
20 private HyperLink lastLink;
21 private HyperLink[] pagingHyperLinks;
22
23 public override ControlCollection Controls
24 ...{
25 get
26 ...{
27 EnsureChildControls();
28 return base.Controls;
29
}
30 }
31 protected override void CreateChildControls()
32 ...{
33 Controls.Clear();
34
35 // Add Page buttons
36 //
37 AddPageLinks();
38
39 // Add Previous Next child controls
40 //
41 AddPreviousNextLinks();
42
43 // Add First Last child controls
44 //
45 AddFirstLastLinks();
46
47 }
48
49 #endregion
50
51 Render functions#region Render functions
52 protected override void Render(HtmlTextWriter writer)
53 ...{
54
55 int totalPages = CalculateTotalPages();
56
57 // Do we have data?
58 //
59 if (totalPages <= 1)
60 return;
61
62 // Render the paging buttons
63 //
64 writer.AddAttribute(HtmlTextWriterAttribute.Class, this.CssClass, false);
65
66 // Render the first button
67 //
68 RenderFirst(writer);
69
70 // Render the previous button
71 //
72 RenderPrevious(writer);
73
74 // Render the page button(s)
75 //
76 RenderPagingButtons(writer);
77
78 // Render the next button
79 //
80 RenderNext(writer);
81
82 // Render the last button
83 //
84 RenderLast(writer);
85
86 //writer.RenderEndTag();
87
88 }
89
90 void RenderFirst (HtmlTextWriter writer)
91 ...{
92
93 int totalPages = CalculateTotalPages();
94
95 if ((PageIndex >= 3) && (totalPages > 5))
96 ...{
97 firstLink.RenderControl(writer);
98
99 LiteralControl l = new LiteralControl(" ... ");
100 l.RenderControl(writer);
101 }
102 }
103
104 void RenderLast (HtmlTextWriter writer)
105 ...{
106 int totalPages = CalculateTotalPages();
107
108 if (((PageIndex + 3) < totalPages) && (totalPages > 5))
109 ...{
110 LiteralControl l = new LiteralControl(" ... ");
111 l.RenderControl(writer);
112
113 lastLink.RenderControl(writer);
114 }
115
116 }
117
118 void RenderPrevious (HtmlTextWriter writer)
119 ...{
120 Literal l;
121
122 if (HasPrevious)
123 ...{
124 previousLink.RenderControl(writer);
125
126 l = new Literal();
127 l.Text = " ";
128 l.RenderControl(writer);
129 }
130
131 }
132
133 void RenderNext(HtmlTextWriter writer)
134 ...{
135 Literal l;
136
137 if (HasNext)
138 ...{
139
140 l = new Literal();
141 l.Text = " ";
142 l.RenderControl(writer);
143
144 nextLink.RenderControl(writer);
145 }
146
147 }
148
149 void RenderButtonRange(int start, int end, HtmlTextWriter writer)
150 ...{
151
152 for (int i = start; i < end; i++)
153 ...{
154
155 // Are we working with the selected index?
156 //
157 if (PageIndex == i)
158 ...{
159
160 // Render different output
161 //
162 Literal l = new Literal();
163 //l.Text = "<span class=\"currentPage\">[" + (i + 1).ToString() + "]</span>";
164 l.Text = (i + 1).ToString();
165
166 l.RenderControl(writer);
167 }
168 else
169 ...{
170 pagingHyperLinks[i].RenderControl(writer);
171 }
172 if ( i < (end - 1) )
173 writer.Write(" ");
174
175 }
176
177 }
178
179 void RenderPagingButtons(HtmlTextWriter writer)
180 ...{
181 int totalPages;
182
183 // Get the total pages available
184 //
185 totalPages = CalculateTotalPages();
186
187 // If we have <= 5 pages display all the pages and exit
188 //
189 if ( totalPages <= 5)
190 ...{
191 RenderButtonRange(0, totalPages, writer);
192 }
193 else
194 ...{
195
196 int lowerBound = (PageIndex - 2);
197 int upperBound = (PageIndex + 3);
198
199 if (lowerBound <= 0)
200 lowerBound = 0;
201
202 if (PageIndex == 0)
203 RenderButtonRange(0, 5, writer);
204
205 else if (PageIndex == 1)
206 RenderButtonRange(0, (PageIndex + 4), writer);
207
208 else if (PageIndex < (totalPages - 2))
209 RenderButtonRange(lowerBound, (PageIndex + 3), writer);
210
211 else if (PageIndex == (totalPages - 2))
212 RenderButtonRange((totalPages - 5), (PageIndex + 2), writer);
213
214 else if (PageIndex == (totalPages - 1))
215 RenderButtonRange((totalPages - 5), (PageIndex + 1), writer);
216 }
217 }
218 #endregion
219
220 ControlTree functions#region ControlTree functions
221 void AddPageLinks()
222 ...{
223 // First add the lower page buttons
224 //
225 pagingHyperLinks = new HyperLink[CalculateTotalPages()];
226
227 // Create the buttons and add them to
228 // the Controls collection
229 //
230 for (int i = 0; i < pagingHyperLinks.Length; i++)
231 ...{
232 pagingHyperLinks[i] = new HyperLink();
233 pagingHyperLinks[i].EnableViewState = false;
234 pagingHyperLinks[i].Text = (i + 1).ToString();
235 pagingHyperLinks[i].ID = (i + 1).ToString();
236 pagingHyperLinks[i].NavigateUrl = CreatePagerURL((i + 1).ToString());
237 Controls.Add(pagingHyperLinks[i]);
238 }
239 }
240
241 void AddFirstLastLinks()
242 ...{
243 int start = 1;
244 firstLink = new HyperLink();
245 firstLink.ID = "First";
246 firstLink.Text = Resources.GetString("Utility_Pager_firstButton");
247 firstLink.NavigateUrl = CreatePagerURL(start.ToString());
248 Controls.Add(firstLink);
249
250 int last = CalculateTotalPages();
251 lastLink = new HyperLink();
252 lastLink.ID = "Last";
253 lastLink.Text = Resources.GetString("Utility_Pager_lastButton");
254 lastLink.NavigateUrl = CreatePagerURL(last.ToString());
255 Controls.Add(lastLink);
256 }
257
258 void AddPreviousNextLinks()
259 ...{
260 int previous;
261
262 if (this.PageIndex < 2)
263 previous = 1;
264 else
265 previous = this.PageIndex;
266
267 previousLink = new HyperLink();
268 previousLink.ID = "Prev";
269 previousLink.Text = Resources.GetString("Utility_Pager_previousButton");
270 previousLink.NavigateUrl = CreatePagerURL(previous.ToString());
271 Controls.Add(previousLink);
272
273 int next = this.PageIndex + 2;
274 nextLink = new HyperLink();
275 nextLink.ID = "Next";
276 nextLink.Text = Resources.GetString("Utility_Pager_nextButton");
277 nextLink.NavigateUrl = CreatePagerURL(next.ToString());
278 Controls.Add(nextLink);
279 }
280 #endregion
281
282 Private Properties#region Private Properties
283 private bool HasPrevious
284 ...{
285 get
286 ...{
287 if (PageIndex > 0)
288 return true;
289
290 return false;
291 }
292 }
293
294 private bool HasNext
295 ...{
296 get
297 ...{
298 if (PageIndex + 1 < CalculateTotalPages() )
299 return true;
300
301 return false;
302 }
303 }
304 #endregion
305
306 Helper methods and Public Properties#region Helper methods and Public Properties
307 protected virtual string CreatePagerURL(string pageIndex)
308 ...{
309 if(!string.IsNullOrEmpty(UrlPattern))
310 return string.Format(UrlPattern,pageIndex);
311
312 if (!string.IsNullOrEmpty(UrlName))
313 ...{
314 return UrlsData.Instance().FormatUrl(UrlName, new object[] ...{ pageIndex });
315 }
316
317 if (csContext.CurrentUri.AbsoluteUri.IndexOf("?") == -1)
318 ...{
319 return csContext.CurrentUri.AbsoluteUri.ToString() + "?PageIndex=" + pageIndex;
320 }
321 else
322 ...{
323 if (csContext.CurrentUri.AbsoluteUri.IndexOf("PageIndex=") == -1)
324 return csContext.CurrentUri.AbsoluteUri.ToString() + "&PageIndex=" + pageIndex;
325 else
326 ...{
327 return Regex.Replace(csContext.CurrentUri.AbsoluteUri.ToString(), @"PageIndex=(\d+\.?\d*|\.\d+)", "PageIndex=" + pageIndex);
328 }
329 }
330 }
331
332 string _urlPattern = null;
333 public string UrlPattern
334 ...{
335 get ...{ return _urlPattern;}
336 set ...{_urlPattern = value;}
337 }
338
339 string _urlName = null;
340 public string UrlName
341 ...{
342 get ...{ return _urlName; }
343 set ...{ _urlName = value; }
344 }
345
346
347 public virtual int CalculateTotalPages()
348 ...{
349 int totalPagesAvailable;
350
351 if (TotalRecords == 0)
352 return 0;
353
354 // First calculate the division
355 //
356 totalPagesAvailable = TotalRecords / PageSize;
357
358 // Now do a mod for any remainder
359 //
360 if ((TotalRecords % PageSize) > 0)
361 totalPagesAvailable++;
362
363 return totalPagesAvailable;
364
365 }
366
367
368 int _pageIndex = 0;
369 public virtual int PageIndex
370 ...{
371 get
372 ...{
373 // Give first try to the ViewState if it was a postback
374 if (Page != null && Page.IsPostBack && ViewState["PageIndex"] != null)...{
375 _pageIndex = (int) ViewState["PageIndex"];
376 }
377 else ...{
378 if (csContext.QueryString["pageindex"] != null)
379 _pageIndex = int.Parse(csContext.QueryString["pageindex"]) - 1;
380 }
381
382 if (_pageIndex < 0)
383 return 0;
384 else
385 return _pageIndex;
386 }
387 set
388 ...{
389 ViewState["PageIndex"] = value;
390 _pageIndex = value;
391 }
392 }
393
394 public virtual int PageSize
395 ...{
396 get
397 ...{
398 int pageSize = Convert.ToInt32(ViewState["PageSize"]);
399
400 if (pageSize == 0)
401 return 10;
402
403 return pageSize;
404 }
405 set
406 ...{
407 ViewState["PageSize"] = value;
408 }
409
410 }
411
412 private bool _causeValidation = true;
413 public bool CausesValidation
414 ...{
415 get ...{return _causeValidation;}
416 set ...{_causeValidation = value;}
417 }
418
419 public int TotalRecords
420 ...{
421 get
422 ...{
423 return Convert.ToInt32(ViewState["TotalRecords"]);
424 }
425 set
426 ...{
427 ViewState["TotalRecords"] = value;
428 }
429 }
430
431 public string UrlCleaner(string RawURL, string QueryName)
432 ...{
433 // Configure the Url
434 if(RawURL.IndexOf("?") != -1)
435 ...{
436 bool hasPart = false;
437 string queryString = RawURL.Substring( RawURL.IndexOf("?") + 1 );
438 string[] parts = queryString.Split('&');
439 for(int i = 0 ; i < parts.Length ; i++)
440 ...{
441 if(parts[i].StartsWith(QueryName))
442 ...{
443 parts[i] = QueryName + "={0}";
444 hasPart = true;
445 }
446 }
447 if(hasPart == true)
448 RawURL = RawURL.Replace(queryString, string.Join("&", parts));
449 else
450 RawURL = RawURL.Replace(queryString, string.Join("&", parts) + "&" + QueryName + "={0}");
451 }
452 else
453 RawURL = RawURL + "?" + QueryName + "={0}";
454
455 return RawURL;
456
457 }
458
459 #endregion
460
461 }
462
}
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