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POProblems with ComboBox used for showing suggestions
 

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  1. POProblems with ComboBox used for showing suggestions
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    <p>I’m trying to implement suggestions ComboBox like Google’s one:</p> <p><img src="https://i.stack.imgur.com/eiEbD.png" alt=""></p> <p>User enters several symbols and a list with suggestions appears. So I have the following code:</p> <pre><code> &lt;!--Search query textBox--&gt; &lt;ComboBox x:Name="txtMain" IsEditable="True" TextBoxBase.SelectionChanged="txtMain_SelectionChanged" TextBoxBase.TextChanged=" txtMain_TextChanged" KeyDown="txtMain_PreviewKeyDown" SelectionChanged=" txtMain_SelectionChanged" IsTextSearchEnabled="False" /&gt; public SearchControl() { InitializeComponent(); _search = new SearchViewModel(doc); _suggestionCom = new SuggestionsCommand( (object s, RunWorkerCompletedEventArgs evarg) =&gt; { List&lt;string&gt; results = _suggestionCom.Suggestions; if (results != null &amp;&amp; results.Count() &gt; 0) { txtMain.ItemsSource = results; } else { txtMain.ItemsSource = null; } txtMain.IsDropDownOpen = true; }); } void autoTextBox_TextChanged(object sender, TextChangedEventArgs e) { try { if (_prevText.Equals(txtMain.Text)) return; // Only autocomplete when there is text if (txtMain.Text.Length &gt; 0) { string lastInput = txtMain.Text; _prevText = lastInput; _suggestionCom.Execute(lastInput); //it starts a new thread which download suggestions from the service } else { txtMain.ItemsSource = null; } } catch (Exception err) { } } void txtMain_PreviewKeyDown(object sender, KeyEventArgs e) { if (e.Key == Key.Down) { if (txtMain.SelectedIndex &lt; txtMain.Items.Count) { txtMain.SelectedIndex = txtMain.SelectedIndex + 1; } } if (e.Key == Key.Up) { if (txtMain.SelectedIndex &gt; -1) { txtMain.SelectedIndex = txtMain.SelectedIndex - 1; } } if (e.Key == Key.Enter) { // Commit the selection //txtMain.Visibility = Visibility.Collapsed; e.Handled = (e.Key == Key.Enter); //Perform search here } if (e.Key == Key.Escape) { // Cancel the selection txtMain.ItemsSource = null; //suggestionListBox.Visibility = Visibility.Collapsed; } } </code></pre> <p>Lambda described in the constructor is called when suggestions have been downloaded. I have the following problems with this code. First, I can’t handle Key.Down (txtMain_PreviewKeyDown is not called when it is pressed). So in order to choose suggestion from a list user need to use mouse. Second, when some suggestions have been found and list has been dropped the text in ComboBox becomes selected (blue) which is not what I want(I don't want to have the text beeing selected when suggestion have been chosen): <img src="https://i.stack.imgur.com/E4a3p.png" alt=""></p>
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