/// <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
                {
                    //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();
                    }
                }
            }
        }
Beispiel #2
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        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.KeyUp        += _textBox_KeyUp;
            _collection.Add(_textBox);
        }