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using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
namespace Xamarin.PropertyEditing.Windows
{
[TemplatePart (Name ="PART_Clear", Type = typeof (Button))]
internal class TextBoxEx
: TextBox
{
public TextBoxEx()
{
PreviewKeyDown += OnPreviewKeyDown;
}
public static readonly DependencyProperty HintProperty = DependencyProperty.Register (
"Hint", typeof(object), typeof(TextBoxEx), new PropertyMetadata (default(object)));
public object Hint
{
get { return (object) GetValue (HintProperty); }
set { SetValue (HintProperty, value); }
}
public static readonly DependencyProperty HintTemplateProperty = DependencyProperty.Register (
"HintTemplate", typeof(DataTemplate), typeof(TextBoxEx), new PropertyMetadata (default(DataTemplate)));
public DataTemplate HintTemplate
{
get { return (DataTemplate) GetValue (HintTemplateProperty); }
set { SetValue (HintTemplateProperty, value); }
}
public static readonly DependencyProperty FocusSelectsAllProperty = DependencyProperty.Register (
"FocusSelectsAll", typeof(bool), typeof(TextBoxEx), new PropertyMetadata (default(bool)));
public bool FocusSelectsAll
{
get { return (bool) GetValue (FocusSelectsAllProperty); }
set { SetValue (FocusSelectsAllProperty, value); }
}
public static readonly DependencyProperty ShowClearButtonProperty = DependencyProperty.Register (
"ShowClearButton", typeof(bool), typeof(TextBoxEx), new PropertyMetadata (default(bool)));
public bool ShowClearButton
{
get { return (bool) GetValue (ShowClearButtonProperty); }
set { SetValue (ShowClearButtonProperty, value); }
}
public static readonly DependencyProperty ClearButtonStyleProperty = DependencyProperty.Register (
"ClearButtonStyle", typeof(Style), typeof(TextBoxEx), new PropertyMetadata (default(Style)));
public Style ClearButtonStyle
{
get { return (Style) GetValue (ClearButtonStyleProperty); }
set { SetValue (ClearButtonStyleProperty, value); }
}
public static readonly DependencyProperty SubmitButtonStyleProperty = DependencyProperty.Register (
"SubmitButtonStyle", typeof(Style), typeof(TextBoxEx), new PropertyMetadata (default(Style)));
public Style SubmitButtonStyle
{
get { return (Style) GetValue (SubmitButtonStyleProperty); }
set { SetValue (SubmitButtonStyleProperty, value); }
}
public override void OnApplyTemplate ()
{
base.OnApplyTemplate ();
var clear = GetTemplateChild ("PART_Clear") as Button;
if (clear == null)
throw new InvalidOperationException ("PART_Clear must be present as a button");
clear.Click += (sender, e) => {
Clear();
};
}
protected override void OnPreviewMouseLeftButtonDown (MouseButtonEventArgs e)
{
if (!FocusSelectsAll || IsKeyboardFocusWithin)
return;
e.Handled = true;
Focus ();
SelectAll ();
base.OnPreviewMouseLeftButtonDown (e);
}
protected override void OnGotKeyboardFocus (KeyboardFocusChangedEventArgs e)
{
base.OnGotKeyboardFocus (e);
FocusSelect ();
}
protected override void OnMouseDoubleClick (MouseButtonEventArgs e)
{
base.OnMouseDoubleClick (e);
FocusSelect ();
}
protected override void OnLostKeyboardFocus (KeyboardFocusChangedEventArgs e)
{
base.OnLostKeyboardFocus (e);
OnSubmit();
}
protected virtual void OnSubmit()
{
var expression = GetBindingExpression (TextProperty);
expression?.UpdateSource ();
}
private void FocusSelect()
{
if (!FocusSelectsAll)
return;
if (SelectionLength == 0)
SelectAll ();
}
private void OnPreviewKeyDown (object sender, System.Windows.Input.KeyEventArgs e)
{
if (e.Key == Key.Enter) {
OnSubmit();
} else if (e.Key == Key.Escape) {
Clear();
}
}
}
}
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