DATAGRID的自定义分页控件

公告

Posted on 2005-08-26 09:27 杨柳阅读(223) 评论(0) 收藏举报

using System;
2

using System.Collections;
3

using System.Collections.Specialized;
4

using System.Web;
5

using System.Web.UI;
6

using System.Web.UI.WebControls;
7

using System.ComponentModel;
8

using System.IO;
9

namespace UC
11

{
12

/// <summary>
13

/// Pager 分页控件
14

/// </summary>
15

public class Pager : WebControl, INamingContainer
16

{
17

public Pager()
18

{
19

//在构造函数中创建控件并把控件加到该控件的Controls里
20

this.Controls.Add( this.GroupAllControls() ) ;
21

}
22

protected override void OnPreRender(EventArgs e)
24

{
25

this.GroupAllDisplayControls() ;
26

}
27

#region 成员属性定义
30

private Label currentPage ;
31

private TextBox txtPageSize ;
32

private TextBox txtPageIndex ;
33

private LinkButton lbtnFirst ;
34

private LinkButton lbtnPrev ;
35

private LinkButton lbtnNext ;
36

private LinkButton lbtnLast ;
37

//样式属性
38

//分页控件文本的呈现样式
39

const string defaultTextStyle = "FONT-SIZE: 12px; COLOR: #333333; FONT-FAMILY: \"宋体\"; TEXT-DECORATION: none" ;
40

//分页控件里的textbox的样式
41

const string defaultTextBoxStyle = "FONT-SIZE: 12px; COLOR: #333333; FONT-FAMILY: \"宋体\"; TEXT-DECORATION: none" ;
42

//分页控件里的TABLE的样式
43

const string defaultTableStyle = "BORDER-RIGHT: #4F9AE1 1px SOLID;MARGIN: 0px;BORDER-LEFT: #4F9AE1 1px SOLID;BORDER-BOTTOM: #4F9AE1 1px SOLID;PADDING:0px;" ;
44

/// <summary>
45

/// 控件文本的呈现样式
46

/// </summary>
47

[
48

Category("Appearance"),
49

Description("控件文本的呈现样式")
50

]
51

public string TextCssClass
52

{
53

get
54

{
55

if(ViewState["TextCssClass"] == null)
56

return "";
57

return ViewState["TextCssClass"].ToString() ;
58

}
59

set
60

{
61

ViewState["TextCssClass"] = value ;
62

}
63

}
64

/// <summary>
66

/// 分页控件里的textbox的样式
67

/// </summary>
68

[
69

Category("Appearance") ,
70

Description("分页控件里的textbox的样式")
71

]
72

public string TextBoxCssClass
73

{
74

get
75

{
76

if(ViewState["TextBoxCssClass"] == null)
77

return "";
78

return ViewState["TextBoxCssClass"].ToString() ;
79

}
80

set
81

{
82

ViewState["TextBoxCssClass"] = value ;
83

}
84

}
85

/// <summary>
86

/// 分页控件里的TABLE样式
87

/// </summary>
88

[
89

Category("Appearance") ,
90

Description("分页控件里的TABLE的样式")
91

]
92

public string TableCssClass
93

{
94

get
95

{
96

if(ViewState["TableCssClass"] == null)
97

return "";
98

return ViewState["TableCssClass"].ToString() ;
99

}
100

set
101

{
102

ViewState["TableCssClass"] = value ;
103

}
104

}
105

106

/// <summary>
107

/// 控件文本的呈现样式
108

/// </summary>
109

[
110

Category("Appearance"),
111

Description("控件文本的呈现样式")
112

]
113

public string TextStyle
114

{
115

get
116

{
117

if(ViewState["TextStyle"] == null)
118

return defaultTextStyle ;
119

120

return ViewState["TextStyle"].ToString() ;
121

}
122

set
123

{
124

ViewState["TextStyle"] = value ;
125

}
126

}
127

128

/// <summary>
129

/// 分页控件里的textbox的样式
130

/// </summary>
131

[
132

Category("Appearance") ,
133

Description("分页控件里的textbox的样式")
134

]
135

public string TextBoxStyle
136

{
137

get
138

{
139

if(ViewState["TextBoxStyle"] == null)
140

return defaultTextBoxStyle ;
141

142

return ViewState["TextBoxStyle"].ToString() ;
143

}
144

set
145

{
146

ViewState["TextBoxStyle"] = value ;
147

}
148

}
149

/// <summary>
150

/// 分页控件里的TABLE样式
151

/// </summary>
152

[
153

Category("Appearance") ,
154

Description("分页控件里的TABLE的样式")
155

]
156

public string TableStyle
157

{
158

get
159

{
160

if(ViewState["TableStyle"] == null)
161

return defaultTableStyle ;
162

163

return ViewState["TableStyle"].ToString() ;
164

}
165

set
166

{
167

ViewState["TableStyle"] = value ;
168

}
169

}
170

171

//分页核心属性
172

int totalPages = 0 ; //总页数
173

const int defaultPageIndex = 0 ; //默认页下标
174

const int defaultTotalRecords = 0 ;//默认总记录数
175

/// <summary>
176

/// 每页显示记录的数量
177

/// </summary>
178

[
179

Category("Required"),
180

Description("指定每页显示记录的数量")
181

]
182

public int PageSize
183

{
184

get
185

{
186

if (ViewState["PageSize"] == null)
187

return 20 ;
188

189

return Convert.ToInt32(ViewState["PageSize"]) ;
190

}
191

set
192

{
193

ViewState["PageSize"] = value;
194

}
195

}
196

/// <summary>
197

/// 当前所在的页码,从0开始表示第一页
198

/// </summary>
199

[
200

Browsable(false),
201

Description("指定当前所在的页码")
202

]
203

public int PageIndex
204

{
205

get
206

{
207

if (ViewState["PageIndex"] == null)
208

return defaultPageIndex;
209

210

return Convert.ToInt32(ViewState["PageIndex"]);
211

}
212

set
213

{
214

ViewState["PageIndex"] = value;
215

}
216

}
217

218

/// <summary>
219

/// 总页数
220

/// </summary>
221

[Browsable(false)]
222

public int TotalPages
223

{
224

get
225

{
226

return totalPages ;
227

}
228

set
229

{
230

totalPages = value ;
231

}
232

}
233

234

/// <summary>
235

/// 指定一共有多少记录
236

/// </summary>
237

[
238

Category("Required"),
239

Description("指定一共有多少记录")
240

]
241

public int TotalRecords
242

{
243

get
244

{
245

if (ViewState["TotalRecords"] == null)
246

return defaultTotalRecords;
247

248

return Convert.ToInt32(ViewState["TotalRecords"].ToString());
249

}
250

set
251

{
252

TotalPages = CalculateTotalPages(value, PageSize);
253

254

ViewState["TotalRecords"] = value;
255

}
256

}
257

258

/// <summary>
259

/// 分页控件里的控件分割符
260

/// </summary>
261

[
262

Category("Required"),
263

Description("分页控件里的控件分割符")
264

]
265

public string Separator
266

{
267

get
268

{
269

if (ViewState["Separator"] == null)
270

return "||" ;
271

272

return ViewState["Separator"].ToString() ;
273

}
274

set
275

{
276

ViewState["Separator"] = value;
277

}
278

}
279

#endregion
280

281

#region 方法
282

/// <summary>
283

/// 计算总页数
284

/// </summary>
285

/// <param name="totalRecords">记录总数</param>
286

/// <param name="pageSize">每页记录数</param>
287

/// <returns></returns>
288

public static int CalculateTotalPages(int totalRecords, int pageSize)
289

{
290

int totalPagesAvailable;
291

292

totalPagesAvailable = totalRecords / pageSize;
293

294

if ((totalRecords % pageSize) > 0)
295

totalPagesAvailable++;
296

297

return totalPagesAvailable;
298

}
299

/// <summary>
300

/// 创建控件把所有子控件组装为一个table
301

/// </summary>
302

/// <returns></returns>
303

private Control GroupAllControls()
304

{
305

Table table;
306

TableRow tr;
307

TableCell td;
308

309

table = new Table();
310

// if(this.TableCssClass != "")
311

// table.CssClass = this.TableCssClass ;
312

// else
313

// table.Attributes["style"] = this.TableStyle;
314

table.CellPadding = 0;
315

table.CellSpacing = 0;
316

table.Width = Unit.Percentage(100) ;
317

318

tr = new TableRow() ;
319

320

td = new TableCell() ;
321

if(this.TableCssClass != "")
322

td.CssClass = this.TableCssClass ;
323

else
324

td.Attributes["style"] = this.TableStyle;
325

td.HorizontalAlign = HorizontalAlign.Center ;
326

td.Controls.Add( this.CreatePrevNextNavigation() ) ;
327

tr.Controls.Add( td ) ;
328

329

td = new TableCell() ;
330

if(this.TableCssClass != "")
331

td.CssClass = this.TableCssClass ;
332

else
333

td.Attributes["style"] = this.TableStyle;
334

td.HorizontalAlign = HorizontalAlign.Center ;
335

td.Controls.Add( this.CreateCurrentPage() ) ;
336

tr.Controls.Add( td ) ;
337

338

td = new TableCell() ;
339

if(this.TableCssClass != "")
340

td.CssClass = this.TableCssClass ;
341

else
342

td.Attributes["style"] = this.TableStyle;
343

td.HorizontalAlign = HorizontalAlign.Center ;
344

td.Controls.Add( this.CreatePageSize() ) ;
345

tr.Controls.Add( td ) ;
346

347

table.Controls.Add( tr ) ;
348

349

return table ;
350

}
351

352

/// <summary>
353

/// 创建用于显示当前分页情况的控件
354

/// </summary>
355

private Control CreateCurrentPage()
356

{
357

currentPage = new Label() ;
358

if(this.TextCssClass != "")
359

currentPage.CssClass = this.TextCssClass ;
360

else
361

currentPage.Attributes["style"] = this.TextStyle;
362

return currentPage ;
363

}
364

365

/// <summary>
366

/// 创建用于供用户设置每页显示记录条数的控件
367

/// </summary>
368

/// <returns></returns>
369

private Control CreatePageSize()
370

{
371

PlaceHolder pageSizeControls = new PlaceHolder();
372

Label lbTemp = new Label() ;
373

lbTemp.Text = "每页记录数:" ;
374

if(this.TextCssClass != "")
375

lbTemp.CssClass = this.TextCssClass ;
376

else
377

lbTemp.Attributes["style"] = this.TextStyle;
378

txtPageSize = new TextBox() ;
379

if(this.TextBoxCssClass != "")
380

txtPageSize.CssClass = this.TextBoxCssClass ;
381

else
382

txtPageSize.Attributes["style"] = this.TextBoxCssClass;
383

txtPageSize.Width = Unit.Point( 20 ) ;
384

txtPageSize.TextChanged += new System.EventHandler(this.TextBox_TextChanged);
385

txtPageSize.AutoPostBack = true;
386

387

pageSizeControls.Controls.Add(lbTemp) ;
388

pageSizeControls.Controls.Add(txtPageSize) ;
389

return pageSizeControls ;
390

}
391

392

/// <summary>
393

/// 创建用于四个分页控件列表以及供用户设置每页记录数的控件
394

/// </summary>
395

/// <returns></returns>
396

private Control CreatePrevNextNavigation()
397

{
398

PlaceHolder prevNextControls = new PlaceHolder();
399

400

//第一页,上一页,下一页,最后页的控件
401

lbtnFirst = new LinkButton() ;
402

this.lbtnFirst.Click += new System.EventHandler(this.PrevNext_Click);
403

lbtnFirst.Text = "首页";
404

lbtnFirst.ToolTip = "首页" ;
405

if(this.TextCssClass != "")
406

lbtnFirst.CssClass = this.TextCssClass ;
407

else
408

lbtnFirst.Attributes["style"] = this.TextStyle;
409

410

lbtnPrev = new LinkButton() ;
411

lbtnPrev.Click += new EventHandler(PrevNext_Click);
412

lbtnPrev.Text = "上一页" ;
413

lbtnPrev.ToolTip = "上一页" ;
414

if(this.TextCssClass != "")
415

lbtnPrev.CssClass = this.TextCssClass ;
416

else
417

lbtnPrev.Attributes["style"] = this.TextStyle;
418

419

lbtnNext = new LinkButton() ;
420

lbtnNext.Click += new EventHandler(PrevNext_Click);
421

lbtnNext.Text = "下一页" ;
422

lbtnNext.ToolTip = "下一页" ;
423

if(this.TextCssClass != "")
424

lbtnNext.CssClass = this.TextCssClass ;
425

else
426

lbtnNext.Attributes["style"] = this.TextStyle;
427

428

lbtnLast = new LinkButton() ;
429

lbtnLast.Click += new EventHandler(PrevNext_Click);
430

lbtnLast.Text = "末页" ;
431

lbtnLast.ToolTip = "末页" ;
432

if(this.TextCssClass != "")
433

lbtnLast.CssClass = this.TextCssClass ;
434

else
435

lbtnLast.Attributes["style"] = this.TextStyle;
436

437

438

//供用户设置和显示当前页码的控件
439

Label lbPageIndexPreTitle = new Label() ;
440

lbPageIndexPreTitle.Text = "转到：第" ;
441

if(this.TextCssClass != "")
442

lbPageIndexPreTitle.CssClass = this.TextCssClass ;
443

else
444

lbPageIndexPreTitle.Attributes["style"] = this.TextStyle;
445

txtPageIndex = new TextBox() ;
446

if(this.TextBoxCssClass != "")
447

txtPageIndex.CssClass = this.TextBoxCssClass ;
448

else
449

txtPageIndex.Attributes["style"] = this.TextBoxCssClass;
450

txtPageIndex.Width = Unit.Point( 20 ) ;
451

txtPageIndex.TextChanged += new System.EventHandler(this.TextBox_TextChanged);
452

txtPageIndex.AutoPostBack = true;
453

Label lbPageIndexNextTitle = new Label() ;
454

lbPageIndexNextTitle.Text = "页" ;
455

if(this.TextCssClass != "")
456

lbPageIndexNextTitle.CssClass = this.TextCssClass ;
457

else
458

lbPageIndexNextTitle.Attributes["style"] = this.TextStyle;
459

460

prevNextControls.Controls.Add( lbtnFirst ) ;
461

prevNextControls.Controls.Add( this.GetWhiteSpace(1) ) ;
462

prevNextControls.Controls.Add( lbtnPrev ) ;
463

prevNextControls.Controls.Add( this.GetWhiteSpace(1) ) ;
464

prevNextControls.Controls.Add( lbtnNext ) ;
465

prevNextControls.Controls.Add( this.GetWhiteSpace(1) ) ;
466

prevNextControls.Controls.Add( lbtnLast ) ;
467

prevNextControls.Controls.Add( this.GetWhiteSpace(1) ) ;
468

prevNextControls.Controls.Add(lbPageIndexPreTitle) ;
469

prevNextControls.Controls.Add( txtPageIndex ) ;
470

prevNextControls.Controls.Add(lbPageIndexNextTitle) ;
471

472

return prevNextControls ;
473

}
474

475

/// <summary>
476

/// 按设定空格数的文本控件,用于间隔控件间的距离
477

/// </summary>
478

/// <param name="num">空格数</param>
479

/// <returns></returns>
480

private Control GetWhiteSpace(int num)
481

{
482

Label lbSeparator = new Label() ;
483

lbSeparator.Text = this.Separator ;
484

if(this.TextCssClass != "")
485

lbSeparator.CssClass = this.TextCssClass ;
486

else
487

lbSeparator.Attributes["style"] = this.TextStyle;
488

return lbSeparator ;
489

}
490

491

/// <summary>
492

/// 把下面的显示控件组合在一起成为一个完整的分页控件显示元素
493

/// </summary>
494

private void GroupAllDisplayControls()
495

{
496

TotalPages = CalculateTotalPages(TotalRecords, PageSize);
497

498

if(PageIndex >= this.TotalPages)
499

{
500

this.PageIndex = this.TotalPages - 1 ;
501

}
502

if(PageIndex < 0) //这里不能用else if
503

{
504

this.PageIndex = 0 ;
505

}
506

507

this.DisplayPageSize() ;
508

this.DisplayPrevNext() ;
509

this.DisplayCurrentIndex() ;
510

this.DisplayCurrentPage() ;
511

}
512

513

/// <summary>
514

/// 显示当前页的情况
515

/// </summary>
516

private void DisplayCurrentPage()
517

{
518

string tempStr = @"第{0}页/共{1}页 总记录数:{2}" ;
519

currentPage.Text = string.Format(tempStr,TotalPages!=0 ? (PageIndex + 1):PageIndex,TotalPages,TotalRecords) ;
520

}
521

522

/// <summary>
523

/// 在指定控件上显示当前页码
524

/// </summary>
525

private void DisplayCurrentIndex()
526

{
527

txtPageIndex.Text = string.Empty ;
528

if(this.TotalPages == 0)
529

{
530

txtPageIndex.Text = this.PageIndex.ToString() ;
531

txtPageIndex.Enabled = false ;
532

return ;
533

}
534

else
535

{
536

txtPageIndex.Text = Convert.ToString(this.PageIndex + 1) ;
537

txtPageIndex.Enabled = true ;
538

}
539

}
540

/// <summary>
541

/// 在指定控件上显示每页记录数
542

/// </summary>
543

private void DisplayPageSize()
544

{
545

txtPageSize.Text = this.PageSize.ToString() ;
546

}
547

548

/// <summary>
549

/// 前后翻页控件的显示情况
550

/// </summary>
551

private void DisplayPrevNext()
552

{
553

554

if ( TotalPages == 0 || TotalPages ==1 )
555

{
556

lbtnFirst.Enabled = false ;
557

lbtnPrev.Enabled = false ;
558

lbtnNext.Enabled = false ;
559

lbtnLast.Enabled = false ;
560

return ;
561

}
562

563

lbtnFirst.CommandArgument = "0" ;
564

lbtnPrev.CommandArgument = (PageIndex - 1).ToString();
565

lbtnNext.CommandArgument = (PageIndex + 1).ToString();
566

lbtnLast.CommandArgument = (TotalPages - 1 ).ToString() ;
567

568

569

//根据不同情况决定那些控件可用与否
570

if ((PageIndex > 0) && ((PageIndex + 1) < TotalPages))
571

{
572

lbtnFirst.Enabled = true ;
573

lbtnPrev.Enabled = true ;
574

lbtnNext.Enabled = true ;
575

lbtnLast.Enabled = true ;
576

}
577

else if (PageIndex == 0 && TotalPages==1)
578

{
579

lbtnFirst.Enabled = false ;
580

lbtnPrev.Enabled = false ;
581

lbtnNext.Enabled = false ;
582

lbtnLast.Enabled = false ;
583

}
584

else if (PageIndex == 0)
585

{
586

lbtnFirst.Enabled = false ;
587

lbtnPrev.Enabled = false ;
588

lbtnNext.Enabled = true ;
589

lbtnLast.Enabled = true ;
590

}
591

else if ((PageIndex + 1) == TotalPages)
592

{
593

lbtnFirst.Enabled = true ;
594

lbtnPrev.Enabled = true ;
595

lbtnNext.Enabled = false ;
596

lbtnLast.Enabled = false ;
597

}
598

}
599

600

#endregion
601

602

#region 公开和处理事件
603

public event System.EventHandler PageIndex_Changed ;
604

605

/// <summary>
606

/// 上下翻页控件点击事件处理,同时对控件外触发PageIndex_Changed事件
607

/// </summary>
608

private void PrevNext_Click(Object sender, EventArgs e)
609

{
610

this.PageIndex = Convert.ToInt32( ((LinkButton)sender).CommandArgument ) ;
611

612

this.PageSize = Convert.ToInt32( this.txtPageSize.Text ) ;
613

614

this.txtPageIndex.Text = this.PageIndex.ToString() ;
615

616

if (null != PageIndex_Changed)
617

PageIndex_Changed(sender, e);
618

}
619

620

/// <summary>
621

/// 当用户手工更改每页分页数,并按enter键提交时重置PageSize和PageIndex,并同时对控件外触发PageIndex_Changed事件
622

/// </summary>
623

private void btnReIndex_Click(Object sender, System.EventArgs e)
624

{
625

this.PageSize = Convert.ToInt32( txtPageSize.Text.Trim() ) ;
626

this.PageIndex = Convert.ToInt32( txtPageIndex.Text.Trim() ) - 1 ;
627

628

if (null != PageIndex_Changed)
629

PageIndex_Changed(sender, e);
630

}
631

632

private void TextBox_TextChanged(object sender, System.EventArgs e)
633

{
634

this.PageSize = Convert.ToInt32( txtPageSize.Text.Trim() ) ;
635

this.PageIndex = Convert.ToInt32( txtPageIndex.Text.Trim() ) - 1 ;
636

637

if (null != PageIndex_Changed)
638

PageIndex_Changed(sender, e);
639

}
640

#endregion
641

642

}
643

}
644

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