同时使用GotFocus和TextChanged - Windows Phone [英] Using GotFocus and TextChanged simultaneously - Windows Phone

问题描述

我有一个 AutoSuggestBox ，它设置为处理事件 GotFocus & TextChanged 同时。我已经从 GotFocus 事件中的文本框中清除了文本。现在的问题是，当我选择 AutoSuggestBox 中的任何建议时，选择它后调用 GotFocus 事件处理程序，并从中清除所选文本。

这是使用AutoSuggestBox的 MainPage.xaml 代码：

 < AutoSuggestBox 
x：Name =auto_text_from
 Horizo​​ntalAlignment =Left
 VerticalAlignment =Center
 PlaceholderText =Enter Source
 Height =auto
 Width =280
 GotFocus =auto_text_from_GotFocus
 TextChanged =AutoSuggestBox_TextChanged/> 
  

这一个是我在 MainPage.xaml中编写的代码。 cs ：

  private void auto_text_from_GotFocus（object sender，RoutedEventArgs e）
 {
 auto_text_from.Text =; 
} 
 
 
 string [] PreviouslyDefinedStringArray = new string [] {Alwar，Ajmer，Bharatpur，Bhilwara，
Banswada 斋浦尔， 焦特布尔， 哥打， 乌代布尔}; 
 
 
 private void AutoSuggestBox_TextChanged（AutoSuggestBox sender，AutoSuggestBoxTextChangedEventArgs args）
 {
列表< string> myList = new List< string>（）; 
 foreach（string myString in PreviouslyDefinedStringArray）
 {
 if（myString.ToLower（）。包含（sender.Text.ToLower（））== true）
 {
 myList.Add（myString）; 
} 
} 
 sender.ItemsSource = myList; 
} 
  

我想使用这两个事件处理程序。 GotFocus 用于清除文本框的数据，以及 TextChanged ，用于显示在其中写入文本的建议。 p>

请以任何方式提供相同的建议。

感谢提前：）

解决方案

如果 AutoSuggestBox 有一个事件来处理建议的单词的选择，如 SuggestionChosen ，一个可能的解决方案是使用在各种处理程序之间管理的私有标志。

设置一个私有字段：

  private bool _isSelectingSuggestion;链接一个方法处理程序，如 OnSuggestionChosen ，将$ / $ / code $ 



事件 SuggestionChosen 并实现它：

  private void OnSuggestionChosen对象发件人，RoutedEventArgs e）
 {
 _isSelectingSuggestion = true; 
} 
  

然后，在GotFocus中，检查这样的标志：

  private void auto_text_from_GotFocus（object sender，RoutedEventArgs e）
 {
 if（_isSelectingSuggestion）
 e.Handled =真正; 
 else 
 auto_text_from.Text =; 
 
 _isSelectingSuggestion = false; 
} 
  

显然这只能在 SuggestionChosen 在 GotFocus 之前被提升：当 GotFocus 开始时，它就像：好吧，我有焦点因为刚刚选择了一个建议，如果是真的，我不能清除我的文本！否则我会清除它！。

让我知道这个为您工作！

I have an AutoSuggestBox which is set to handle the events GotFocus & TextChanged simultaneously. I have cleared the text from the text box in GotFocus event. Now the problem is that when I select any of the suggestions in AutoSuggestBox, after selecting it calls the GotFocus event handler and clears the selected text from it.

This is the MainPage.xaml code using the AutoSuggestBox:

        <AutoSuggestBox
            x:Name="auto_text_from"
            HorizontalAlignment="Left"
            VerticalAlignment="Center"
            PlaceholderText="Enter Source"
            Height="auto"
            Width="280"
            GotFocus="auto_text_from_GotFocus"
            TextChanged="AutoSuggestBox_TextChanged"/>

And this one is the code which I have written in MainPage.xaml.cs :

    private void auto_text_from_GotFocus(object sender, RoutedEventArgs e)
    {
        auto_text_from.Text = "";
    }


    string[] PreviouslyDefinedStringArray = new string[] {"Alwar","Ajmer","Bharatpur","Bhilwara",
        "Banswada","Jaipur","Jodhpur","Kota","Udaipur"};


    private void AutoSuggestBox_TextChanged(AutoSuggestBox sender,AutoSuggestBoxTextChangedEventArgs args)
    {
        List<string> myList = new List<string>();
        foreach (string myString in PreviouslyDefinedStringArray)
        {
            if (myString.ToLower().Contains(sender.Text.ToLower()) == true)
            {
                myList.Add(myString);
            }
        }
        sender.ItemsSource = myList;
    }

I want to use both of the event handlers. GotFocus for clearing the data of Text box, and TextChanged for showing the suggestions of writing the text in it.

Please suggest me any way to do the same.

Thanks in Advance :)

解决方案

If AutoSuggestBox has an event to handle the selection of a suggested word, like "SuggestionChosen", a possibile solution is using a private flag managed between the various handlers.

Set a private field:

private bool _isSelectingSuggestion;

Link a method-handler like OnSuggestionChosen to the event SuggestionChosen and implement it like that:

private void OnSuggestionChosen(object sender, RoutedEventArgs e)
{
    _isSelectingSuggestion = true;
}

Then, in GotFocus, check the flag like this:

private void auto_text_from_GotFocus(object sender, RoutedEventArgs e)
{
    if (_isSelectingSuggestion)
        e.Handled = true;
    else
        auto_text_from.Text = "";

   _isSelectingSuggestion = false;
}

Obviously this works only if SuggestionChosen is raised before GotFocus: when GotFocus begins, it proceeds like: "ok, I've got focus because a suggestion was chosen just a moment ago? If it's true, I must not clear my Text! Otherwise, I shall clear it!".

Let me know it this work for you!

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