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如何给wp(Windows phone)中搜索关键字加亮?

问题来源

最近在群里看到群友讨论在wp中有个搜索功能,要求搜索关键字在搜索结果内容中加亮(即加颜色),由于wp中没有自带这样的控件,于是大家各抒自见,有人说用第三方控件,有人说用richtextbox,也有人说用textblock和run!那究竟哪种实现比较好呢?个人看法,当然是用textblock和run实现起来是最方便的!

实现要求

1、给出关键字(如:我,购物,菜鸟,技术),关键字可以一个或者多个,多个用英文逗号隔开

2、能在搜索结果中对关键字进行加亮

3、能自定义加亮的颜色

4、要求复用性高

实现思路

如果要实现上面三点需求,首先我们想到是使用用户控件实现起来最好了,第一,二,三点分别用一个依赖属性表示,而第四点,既然是用户控件,作为一个控件,当然复用性强!

所以使用用户控件是再适合不过了!

材料准备

首先当然是在vs中新建一个wp的项目,然后添加一个用户控件的页面,这个估计不用我多说了,大家都会的了!在这里我新增一个HighlightControl的用户控件页面,在界面上添加一个TextBlock,命名为tbResult,打开codebehind,分别添加三个依赖属性,分别是TextProperty(搜索结果),HighlightWordProperty(关键字),HighlightWordColorProperty(加亮颜色),然后添加对应的包装属性,再添加回调方法!这些应该不用详解吧,学过wpf或者silverlight对这些应该很了解了!如果不懂可以评论问问!

 

下面贴出用户控件codebehind相应代码

 

  1  public static readonly DependencyProperty TextProperty = DependencyProperty.Register("Text", typeof(string), typeof(HighlightControl), new PropertyMetadata(new PropertyChangedCallback(HighlightControl.OnTextChanged)));  2         public static readonly DependencyProperty HighlightWordProperty = DependencyProperty.Register("HighlightWord", typeof(string), typeof(HighlightControl), new PropertyMetadata(new PropertyChangedCallback(HighlightControl.OnHighlightWordChanged)));  3         public static readonly DependencyProperty HighlightWordColorProperty = DependencyProperty.Register("HighlightWordColor", typeof(SolidColorBrush), typeof(HighlightControl), new PropertyMetadata(new SolidColorBrush(Color.FromArgb(255, 0, 155, 227)), new PropertyChangedCallback(HighlightControl.OnHighlightWordColorChanged)));  4   5         public string Text  6         {  7             get  8             {  9                 return (string)base.GetValue(HighlightControl.TextProperty); 10             } 11             set 12             { 13                 base.SetValue(HighlightControl.TextProperty, value); 14             } 15         } 16  17         public SolidColorBrush HighlightWordColor 18         { 19             get 20             { 21                 return (SolidColorBrush)base.GetValue(HighlightControl.HighlightWordColorProperty); 22             } 23             set 24             { 25                 base.SetValue(HighlightControl.HighlightWordColorProperty, value); 26             } 27         } 28  29         public string HighlightWord 30         { 31             get 32             { 33                 return (string)base.GetValue(HighlightControl.HighlightWordProperty); 34             } 35             set 36             { 37                 base.SetValue(HighlightControl.HighlightWordProperty, value); 38             } 39         } 40  41  42         private static void OnTextChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 43         { 44             HighlightControl control = d as HighlightControl; 45             if (e.NewValue =http://www.mamicode.com/= e.OldValue) 46             { 47                 return; 48             } 49             HighlightControl.UpdateHighlight(control); 50         } 51  52         private static void OnHighlightWordChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 53         { 54             HighlightControl control = d as HighlightControl; 55             HighlightControl.UpdateHighlight(control); 56         } 57  58         private static void OnHighlightWordColorChanged(DependencyObject d, DependencyPropertyChangedEventArgs e) 59         { 60             HighlightControl control = d as HighlightControl; 61             HighlightControl.UpdateHighlight(control); 62         } 63  64  65  66  67  68         private static void UpdateHighlight(HighlightControl control) 69         { 70             if (control == null) 71             { 72                 return; 73             } 74             TextBlock textBlock = control.tbResult; 75             if (textBlock.Inlines.Count() > 0) 76             { 77                 textBlock.Inlines.Clear(); 78             } 79             //如果高亮为空,直接显示 80             if (string.IsNullOrEmpty(control.HighlightWord)) 81             { 82                 Run run = new Run(); 83                 run.Text = control.Text; 84                 textBlock.Inlines.Add(run); 85                 return; 86             } 87             string text = control.Text; 88             if (string.IsNullOrEmpty(text)) 89             { 90                 return; 91             } 92             TextBlock tempTextBlock = new TextBlock();//中间变量,方便run交换 93             string[] hightwordArray = control.HighlightWord.Split(,); 94             List<Run> listHightRun = new List<Run>();//添加已经加亮的run,方便判断 95             for (int i = 0; i < hightwordArray.Length; i++) 96             { 97                 if (hightwordArray[i] == "") continue;//这个是放在关键字中有"",导致死循环 98  99                 if (i == 0)100                 {101                     for (int num = text.IndexOf(hightwordArray[i], 0); num != -1; num = text.IndexOf(hightwordArray[i], 0))102                     {103                         //  MessageBox.Show(num.ToString());104                         if (num != 0)105                         {106                             Run run2 = new Run();107                             run2.Text = text.Substring(0, num);108                             // textBlock.Inlines.Add(run2);109                             tempTextBlock.Inlines.Add(run2);110 111                         }112                         Run run3 = new Run();113                         run3.Text = text.Substring(num, hightwordArray[i].Length);114                         run3.Foreground = control.HighlightWordColor;115                         listHightRun.Add(run3);116                         //textBlock.Inlines.Add(run3);117                         tempTextBlock.Inlines.Add(run3);118                         text = text.Substring(num + hightwordArray[i].Length);119                         // MessageBox.Show(text);120                     }121                     if (!string.IsNullOrEmpty(text))122                     {123                         Run run4 = new Run();124                         run4.Text = text;125                         tempTextBlock.Inlines.Add(run4);//剩下没有被加亮的文字,加到一个run126                     }127 128                 }129                 else130                 {131                     // text = control.Text;132                     //  MessageBox.Show("要遍历textBlock长度:" + textBlock.Inlines.Count.ToString());133                     for (int j = 0; j < textBlock.Inlines.Count; j++)134                     {135                         if (listHightRun.Any(h => h.Equals((textBlock.Inlines[j] as Run))))//如果是一个加亮的run,那就不需要遍历了136                         {137                             // MessageBox.Show("jin" + (textBlock.Inlines[j] as Run).Text);138                             Run runExist = (textBlock.Inlines[j] as Run);139                             textBlock.Inlines.Remove(textBlock.Inlines[j]);140                             tempTextBlock.Inlines.Add(runExist);141                             j--;142                             //  MessageBox.Show("移除元素后textBlock长度:" + textBlock.Inlines.Count + "  j: " + j);143                             continue;144                         }145                         string tempStr = (textBlock.Inlines[j] as Run).Text;146                         for (int num = tempStr.IndexOf(hightwordArray[i], 0); num != -1; num = tempStr.IndexOf(hightwordArray[i], 0))147                         {148                             //MessageBox.Show("要遍历的字符串:"+tempStr);149                             //MessageBox.Show("关键字是否存在:"+num.ToString());150                             //MessageBox.Show("关键字:"+hightwordArray[i]);151                             if (num != 0)152                             {153                                 Run run2 = new Run();154                                 run2.Text = tempStr.Substring(0, num);155 156                                 tempTextBlock.Inlines.Add(run2);157                             }158                             Run run3 = new Run();159                             run3.Text = tempStr.Substring(num, hightwordArray[i].Length);160                             run3.Foreground = control.HighlightWordColor;161                             listHightRun.Add(run3);162                             tempTextBlock.Inlines.Add(run3);163                             tempStr = tempStr.Substring(num + hightwordArray[i].Length);164                             // (textBlock.Inlines[j] as Run).Text = (textBlock.Inlines[j] as Run).Text.Substring(num + hightwordArray[i].Length);165                         }166                         if (!string.IsNullOrEmpty(tempStr))//剩下没有被加亮的文字,加到一个run167                         {168                             Run run4 = new Run();169                             run4.Text = tempStr;170                             tempTextBlock.Inlines.Add(run4);171                         }172                     }173                 }174                 textBlock.Inlines.Clear();175 176                 int k = 0;177                 while (k < tempTextBlock.Inlines.Count)178                 {179                     Run tempRun = tempTextBlock.Inlines[k] as Run;180                     tempTextBlock.Inlines.Remove(tempTextBlock.Inlines[k]);181                     textBlock.Inlines.Add(tempRun);182                     k = 0;183 184                 }185 186                 //tempTextBlock.Inlines.Clear();187 188             }189 190 191 192         }

 

测试页面代码

 

 1    <!--LayoutRoot 是包含所有页面内容的根网格--> 2     <Grid x:Name="LayoutRoot" Background="Transparent"> 3         <Grid.RowDefinitions> 4             <RowDefinition Height="Auto"/> 5             <RowDefinition Height="*"/> 6         </Grid.RowDefinitions> 7  8      9 10         <!--TitlePanel 包含应用程序的名称和页标题-->11         <StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">12             <TextBlock Text="我的应用程序" Style="{StaticResource PhoneTextNormalStyle}" Margin="12,0"/>13             <TextBlock Text="页面名称" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>14         </StackPanel>15 16         <!--ContentPanel - 在此处放置其他内容-->17         <Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0">18             19             <control:HighlightControl Text="这是一个显示加亮在搜索结果中的关键字的用户控件" HighlightWord="高,的,这是,测试,亮,段" HighlightWordColor="Red">20                 21             </control:HighlightControl>22 23         </Grid>24 25        26     </Grid>

 


整个实现大概就是这样,最后截一张图给大家看看。

 

 

总结

问题总有解决的方法的,很多你看似是比较困难的事情,其实都是由最基础的知识去一步步分解出来解决的,所以善于思考,举一反三,才是快速解决问题的根本途径!

如何给wp(Windows phone)中搜索关键字加亮?