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How to select entire text on mouse click in WPF MultiColumnDropDown?
2 mins read
WPF MultiColumnDropDown (SfMultiColumnDropDown) allows you to edit via TextBox. You can select the text displayed in the textbox when it got the focus from any other control by wiring the Loaded event of MultiColumnDropDown and calling the TextBox Control SelectAll method in the TextBox.PreviewMouseLeftButtonUp event and defining the Boolean property customization in lost focus event.
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
this.MultiColumnControl.Loaded += MultiColumnControl_Loaded;
}
void MultiColumnControl_Loaded(object sender, RoutedEventArgs e)
{
TextBox textBox = (TextBox)GridUtil.FindDescendantChildByType(MultiColumnControl, typeof(TextBox));
textBox.PreviewMouseLeftButtonUp += TextBox_PreviewMouseLeftButtonUp;
textBox.LostFocus += TextBox_LostFocus;
}
private void TextBox_LostFocus(object sender, RoutedEventArgs e)
{
//Enable the boolean property after lost focus of SfMultiColumnDropDownControl
mouseClickSelection = true;
}
//declare the boolean property
bool mouseClickSelection = true;
private async void TextBox_PreviewMouseLeftButtonUp(object sender, System.Windows.Input.MouseButtonEventArgs e)
{
TextBox tb = sender as TextBox;
//Check the condition when selection apply or not
if (mouseClickSelection)
{
await Application.Current.Dispatcher.InvokeAsync(tb.SelectAll);
//disable the boolean porperty to selection apply only first time in SfMultiColumnDropDownControl via mouse click
mouseClickSelection = false;
}
}
protected override void OnClosing(CancelEventArgs e)
{
TextBox textBox = (TextBox)GridUtil.FindDescendantChildByType(MultiColumnControl, typeof(TextBox));
textBox.PreviewMouseLeftButtonUp -= TextBox_PreviewMouseLeftButtonUp;
this.MultiColumnControl.Loaded -= MultiColumnControl_Loaded;
}
}
The following screenshot shows the selecting text when editor got focus in MultiColumnDropDown.
Take a moment to peruse the WPF MultiColumnDropDown - Editing and Auto complete documentation, where you can find about editing and auto complete with code examples.
