学步园

  4     /// Author: [ ChengKing(ZhengJian) ] 
  5     /// Blog:   Http://blog.csdn.net/ChengKing
  6     /// 本代码 参照 Asp.net 2.0高级编程 方案
  7     /// 
  8     [DefaultProperty("Value")]
  9     [ToolboxData("{0}:SimpleGaugeBar>")]
 10     [PersistChildrenAttribute(false)]
 11     public class SimpleGaugeBar : CompositeControl
 12     {
 13         //在绘制输出画面时，标志是哪个TD为分界点(从这个分界点改变表格的颜色绘制)
 14         private int _intDividerCell;
 15 
 16         private TextItemStyle _textStyle;
 17 
 18         public SimpleGaugeBar()            
 19         {
 20         }
 21 
 22         #region 属性
 23         /// 

 24         /// 进度条值
 25         /// 
 26         public float Value
 27         {
 28             get
 29             {
 30                 object o = ViewState["Value"];
 31                 if (o == null)
 32                     return 0;
 33                 return float.Parse(o.ToString());
 34             }
 35             set
 36             {
 37                 this.ViewState["Value"] = value;
 38                 if (value > Maximum)
 39                 {
 40                     this.ViewState["Value"] = Maximum;
 41                 }
 42             }
 43         }
 44 
 45         /// 

 46         /// 全值
 47         /// 
 48         public float Maximum
 49         {
 50             get
 51             {
 52                 object o = this.ViewState["Maximum"];
 53                 if (o == null)
 54                 {
 55                     return 100;
 56                 }
 57                 return float.Parse(o.ToString());
 58             }
 59             set
 60             {
 61                 this.ViewState["Maximum"] = value;
 62             }
 63         }
 64 
 65         /// 

 66         /// 表示进度条分几段
 67         /// 
 68         public int Segments
 69         {
 70             get
 71             {
 72                 object o = this.ViewState["Segments"];
 73                 if (o == null)
 74                 {
 75                     return 4;
 76                 }
 77                 return int.Parse(o.ToString());
 78             }
 79             set
 80             {
 81                 this.ViewState["Segments"] = value;
 82                 if (value  1)
 83                 {
 84                     this.ViewState["Segments"] = 1;
 85                 }
 86             }
 87         }
 88 
 89         /// 

 90         /// 文本呈现格式
 91         /// 
 92         public string FormatString
 93         {
 94             get
 95             {
 96                 object o = this.ViewState["FormatString"];
 97                 if (o == null)
 98                 {
 99                     return "{0}/{1}";
100                 }
101                 return (string)o;
102             }
103             set
104             {
105                 this.ViewState["FormatString"] = value;
106             }
107         }
108 
109         public bool GridLines
110         {
111             get
112             {
113                 object o = this.ViewState["GridLines"];
114                 if (o == null)
115                 {
116                     return true;
117                 }
118                 return (bool)o;
119             }
120             set
121             {
122                 this.ViewState["GridLines"] = value;
123             }
124         }
125 
126         [PersistenceMode(PersistenceMode.EncodedInnerDefaultProperty)]
127         [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
128         [NotifyParentProperty(true)]        
129         public TextItemStyle TextStyle
130         {
131             get
132             {
133                 if (_textStyle == null)
134                 {
135                     _textStyle = new TextItemStyle();
136                 }
137                 if (IsTrackingViewState)
138                 {
139                     ((IStateManager)_textStyle).TrackViewState();
140                 }
141                 return _textStyle;
142             }
143         }
144 
145         #endregion
146 
147         #region 方法
148 
149         protected override void Render(HtmlTextWriter writer)
150         {
151             PrepareControlForRendering();            
152             base.Render(writer);
153 
154             //base.RenderContents(writer);
155             //this.RenderContents(writer);
156             //this.Render(writer);
157             
158         }
159 
160         protected override void CreateChildControls()
161         {
162             //base.CreateChildControls();
163             this.Controls.Clear();
164             CreateControlHierarchy();
165             ClearChildViewState();
166         }
167 
168         /// 

169         /// 在Web开发中，用Table/TR/TD来表示图形输出
170         /// 
171         protected virtual void CreateControlHierarchy()
172         {
173             //最外层表格
174             Table outer = new Table();
175             TableRow outerRow = new TableRow();
176             outer.Rows.Add(outerRow);
177 
178             TableCell rulerCell = new TableCell();
179             outerRow.Cells.Add(rulerCell);
180             BuildGaugeBar(rulerCell);
181 
182             //根据条件增加文本显示单元格
183             TableCell textCell = new TableCell();
184             if (!TextStyle.DisplayTextAtBottom)
185             {
186                 outerRow.Cells.Add(textCell);
187                 BuildLabel(textCell);
188             }
189 
190             this.Controls.Add(outer);
191 
192             if (!TextStyle.RenderInsideTable && TextStyle.DisplayTextAtBottom)
193             {
194                 BuildLabel(null);
195             }
196         }
197 
198         /// 

199         /// 用Label来呈现文本,如: { 8/10 }
200         /// 
201         /// 
202         void BuildLabel(TableCell tc)
203         {
204             float buf = GetValueToRepresent();
205             string msg = GetTextToRepresent();
206 
207             Label lbl = new Label();
208             if (tc is TableCell)
209             {
210                 tc.Controls.Add(lbl);
211             }
212             else
213             {
214                 this.Controls.Add(lbl);
215             }
216             lbl.Text = String.Format(msg, buf, Maximum);
217         }
218 
219         void BuildGaugeBar(TableCell tc)
220         {
221             Table t = new Table();
222             TableRow tr = new TableRow();
223             t.Rows.Add(tr);
224 
225             BuildRuler(tr);
226 
227             if (TextStyle.RenderInsideTable)
228             {
229                 BuildLabelIntoTable(t);
230             }
231             tc.Controls.Add(t);
232         }
233 
234         void BuildRuler(TableRow ruler)
235         {
236             float val = GetValueToRepresent();
237             float valueToRepresent = 100f * val / Maximum;
238             int numOfSegments = GetNumOfSegments();
239             int segmentWidth = 100 / numOfSegments;
240             bool finished = false;
241             for (int i = 1; i  numOfSegments; i++)
242             {
243                 if (valueToRepresent  i * segmentWidth)
244                 {
245                     if (finished)
246                     {
247                         TableCell stillToDo = new TableCell();
248                         ruler.Cells.Add(stillToDo);
249                         stillToDo.Width = Unit.Percentage(segmentWidth);
250                     }
251                     else
252                     {
253                         _intDividerCell = i - 1;
254                         TableCell cell = new TableCell();
255                         ruler.Cells.Add(cell);
256                         cell.Width = Unit.Percentage(segmentWidth);
257                         cell.Height = Unit.Percentage(100);
258 
259                         //增加子表
260                         Table child = new Table();
261                         child.Width = Unit.Percentage(100);
262                         child.Height = Unit.Percentage(100);
263                         cell.Controls.Add(child);
264                         child.CellPadding = 0;
265                         child.CellSpacing = 0;
266                         TableRow childRow = new TableRow();
267                         child.Rows.Add(childRow);
268 
269                         float fx = (100 * (valueToRepresent - segmentWidth * (i - 1)) / segmentWidth);
270                         if (valueToRepresent > (i - 1) * segmentWidth)
271                         {
272                             TableCell left = new TableCell();
273                             childRow.Cells.Add(left);
274                             left.Width = Unit.Percentage(fx);
275                         }
276