using System;

using System.ComponentModel;

using System.Windows;

using System.Windows.Controls;

using System.Windows.Input;

using System.Windows.Media;

namespace GitHub.UI

{

public class FilterTextBox : TextBox

{

public static readonly DependencyProperty PromptTextProperty =

DependencyProperty.Register("PromptText", typeof(string), typeof(FilterTextBox), new UIPropertyMetadata("Filter"));

[Localizability(LocalizationCategory.Text)]

[DefaultValue("Filter")]

public string PromptText

{

get { return (string)GetValue(PromptTextProperty); }

set { SetValue(PromptTextProperty, value); }

}

public FilterTextBox()

{

// http://stackoverflow.com/a/661224/2114

AddHandler(PreviewMouseLeftButtonDownEvent, new MouseButtonEventHandler(SelectivelyIgnoreMouseButton), true);

AddHandler(GotKeyboardFocusEvent, new RoutedEventHandler(SelectAllText), true);

AddHandler(MouseDoubleClickEvent, new RoutedEventHandler(SelectAllText), true);

AddHandler(Button.ClickEvent, new RoutedEventHandler(ClearButtonClick), true);

}

protected override void OnKeyDown(KeyEventArgs e)

{

if (e.Key == Key.Escape && !String.IsNullOrEmpty(Text))

{

Clear();

e.Handled = true;

}

base.OnPreviewKeyDown(e);

}

void ClearButtonClick(object sender, RoutedEventArgs e)

{

Clear();

e.Handled = true;

}

// http://stackoverflow.com/a/661224/2114

static void SelectivelyIgnoreMouseButton(object sender, MouseButtonEventArgs e)

{

var textBox = FindTextBoxInAncestors(e.OriginalSource as UIElement);

if (textBox != null && !textBox.IsKeyboardFocusWithin)

{

// If the text box is not yet focussed, give it the focus and

// stop further processing of this click event.

textBox.Focus();

e.Handled = true;

}

}

static TextBox FindTextBoxInAncestors(DependencyObject current)

{

while (current != null)

{

var tb = current as TextBox;

if (tb != null)

return tb;

current = VisualTreeHelper.GetParent(current);

}

return null;

}

static void SelectAllText(object sender, RoutedEventArgs e)

{

var textBox = e.OriginalSource as TextBox;

if (textBox != null)

textBox.SelectAll();

}

}

}