我有一个像这样的自动完成文本框:
public class AutoCompleteTextBox:ComboBox
{
public AutoCompleteTextBox()
{
ResourceDictionary rd = new ResourceDictionary();
rd.Source = new Uri("/"+this.GetType().Assembly.GetName().Name+";component/Styles/MainViewStyle.xaml",UriKind.Relative);
this.Resources = rd;
this.IsTextSearchEnabled = false;
}
/// <summary>
/// Override OnApplyTemplate method
/// Get TextBox control out of Combobox control, and hook up TextChanged event.
/// </summary>
public override void OnApplyTemplate()
{
base.OnApplyTemplate();
//get the textbox control in the ComboBox control
TextBox textBox = this.Template.FindName("PART_EditableTextBox", this) as TextBox;
if (textBox != null)
{
//disable Autoword selection of the TextBox
textBox.AutoWordSelection = false;
//handle TextChanged event to dynamically add Combobox items.
textBox.TextChanged += new TextChangedEventHandler(textBox_TextChanged);
}
}
public ObservableCollection<string> SuggestionList
{
get { return (ObservableCollection<string>)GetValue(SuggestionListProperty); }
set { SetValue(SuggestionListProperty, value); }
}
public static readonly DependencyProperty SuggestionListProperty = DependencyProperty.Register("SuggestionList", typeof(ObservableCollection<string>), typeof(AutoCompleteTextBox), new UIPropertyMetadata());
/// <summary>
/// main logic to generate auto suggestion list.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.Windows.Controls.TextChangedEventArgs"/>
/// instance containing the event data.</param>
void textBox_TextChanged(object sender, TextChangedEventArgs e)
{
TextBox textBox = sender as TextBox;
textBox.AutoWordSelection = false;
// if the word in the textbox is selected, then don't change item collection
if ((textBox.SelectionStart != 0 || textBox.Text.Length == 0))
{
this.Items.Clear();
//add new filtered items according the current TextBox input
if (!string.IsNullOrEmpty(textBox.Text))
{
foreach (string s in this.SuggestionList)
{
if (s.StartsWith(textBox.Text, StringComparison.InvariantCultureIgnoreCase))
{
string unboldpart = s.Substring(textBox.Text.Length);
string boldpart = s.Substring(0, textBox.Text.Length);
//construct AutoCompleteEntry and add to the ComboBox
AutoCompleteEntry entry = new AutoCompleteEntry(s, boldpart, unboldpart);
this.Items.Add(entry);
}
}
}
}
// open or close dropdown of the ComboBox according to whether there are items in the
// fitlered result.
this.IsDropDownOpen = this.HasItems;
//avoid auto selection
textBox.Focus();
textBox.SelectionStart = textBox.Text.Length;
}
}
/// <summary>
/// Extended ComboBox Item
/// </summary>
public class AutoCompleteEntry : ComboBoxItem
{
private TextBlock tbEntry;
//text of the item
private string text;
/// <summary>
/// Contrutor of AutoCompleteEntry class
/// </summary>
/// <param name="text">All the Text of the item </param>
/// <param name="bold">The already entered part of the Text</param>
/// <param name="unbold">The remained part of the Text</param>
public AutoCompleteEntry(string text, string bold, string unbold)
{
this.text = text;
tbEntry = new TextBlock();
//highlight the current input Text
tbEntry.Inlines.Add(new Run
{
Text = bold,
FontWeight = FontWeights.Bold,
Foreground = new SolidColorBrush(Colors.RoyalBlue)
});
tbEntry.Inlines.Add(new Run { Text = unbold });
this.Content = tbEntry;
}
/// <summary>
/// Gets the text.
/// </summary>
public string Text
{
get { return this.text; }
}
}
我的xaml看起来像这样:
<local:AutoCompleteTextBox SuggestionList="{Binding Suggestions}"
Text="{Binding Path=Keyword,UpdateSourceTrigger=PropertyChanged}"
x:Name="SearchTextBox"/>
当我按下回车键时,我想执行搜索命令,但如果屏幕上有建议组合框,按回车键只关闭建议组合框,我需要再次按回车键执行命令。有没有办法关闭建议组合框并按一次按Enter键执行命令?
由于
答案 0 :(得分:0)
您可以在处理DropDownClosed
事件时调用搜索。
<local:AutoCompleteTextBox SuggestionList="{Binding Suggestions}"
Text="{Binding Path=Keyword,UpdateSourceTrigger=PropertyChanged}"
DropDownClosed="OnDropDownClosed"
x:Name="SearchTextBox"/>
OnDropDownClosed:
private void OnDropDownClosedobject sender, RoutedPropertyChangedEventArgs<bool> e)
{
// search on Keyword
}