/// <summary>
/// Determines whether [is in edit mode update] [the specified obj].
/// </summary>
/// <param name="obj">The obj.</param>
/// <param name="e">The <see cref="System.Windows.DependencyPropertyChangedEventArgs"/> instance containing the event data.</param>
private static void IsInEditModeUpdate(DependencyObject obj, DependencyPropertyChangedEventArgs e)
{
EditableTextBlock textBlock = obj as EditableTextBlock;
if (null != textBlock)
{
//Get the adorner layer of the uielement (here TextBlock)
AdornerLayer layer = AdornerLayer.GetAdornerLayer(textBlock);
//If the IsInEditMode set to true means the user has enabled the edit mode then
//add the adorner to the adorner layer of the TextBlock.
if (textBlock.IsInEditMode)
{
if (null == textBlock._adorner)
{
textBlock._adorner = new EditableTextBlockAdorner(textBlock);
//Events wired to exit edit mode when the user presses Enter key or leaves the control.
textBlock._adorner.TextBoxKeyUp += textBlock.TextBoxKeyUp;
textBlock._adorner.TextBoxLostFocus += textBlock.TextBoxLostFocus;
}
layer.Add(textBlock._adorner);
}
else if (null != layer)
{
//Remove the adorner from the adorner layer.
Adorner[] adorners = layer.GetAdorners(textBlock);
if (adorners != null)
{
foreach (Adorner adorner in adorners)
{
if (adorner is EditableTextBlockAdorner)
{
layer.Remove(adorner);
}
}
}
//Update the textblock's text binding.
BindingExpression expression = textBlock.GetBindingExpression(TextProperty);
if (null != expression)
{
expression.UpdateTarget();
}
}
}
}
public EditableTextBlockAdorner(EditableTextBlock adornedElement)
: base(adornedElement)
{
_collection = new VisualCollection(this);
_textBox = new TextBox();
_textBlock = adornedElement;
Binding binding = new Binding("Text")
{
Source = adornedElement
};
_textBox.SetBinding(TextBox.TextProperty, binding);
_textBox.AcceptsReturn = true;
_textBox.MaxLength = adornedElement.MaxLength;
_textBox.SelectAll();
_textBox.KeyUp += _textBox_KeyUp;
_collection.Add(_textBox);
}