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POWPF/MVVM: RichTexBox as datagrid cell editor, put formatting code into ViewModel?
 

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  1. POWPF/MVVM: RichTexBox as datagrid cell editor, put formatting code into ViewModel?
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    <p>I really wonder what I can put in the ViewModel. </p> <p>If its needed to be tested might some say...</p> <p>But when the properties like CaretPosition (to get the selected Text) are no dependency </p> <p>properties, then better forget about the ViewModel.</p> <p>At the moment I have this in the codebehind:</p> <pre><code>private void rtbContent_SelectionChanged(object sender, System.Windows.RoutedEventArgs e) { RichTextBox rtb = sender as RichTextBox; TextPointer tpForward = rtb.CaretPosition.GetNextContextPosition(LogicalDirection.Forward); TextPointer tpBackward = rtb.CaretPosition.GetNextContextPosition(LogicalDirection.Backward); if (tpForward != null &amp;&amp; tpBackward != null) { DependencyObject nextObj = tpForward.GetAdjacentElement(LogicalDirection.Forward); DependencyObject prevObj = tpBackward.GetAdjacentElement(LogicalDirection.Backward); TextElement textElement = (TextElement)(nextObj ?? prevObj); if (textElement != null) { tbBold.IsChecked = textElement.FontWeight == FontWeights.Bold; tbItalic.IsChecked = textElement.FontStyle == FontStyles.Italic; //... } } } </code></pre> <p>This code is formatting selected Text, toggles the state of the togglebutton when the cursor is before a formatted char/has formatted chars, just like in word...</p> <p>1.) Where does such code belong? Code-behind or ViewModel? Actually I know the answer because of technical restrictions of the RTBox it will stay in the code-behind.</p> <p>2.) The logic to toggle the format buttons is done via</p> <p></p> <p>But that will not work as the BoldCommand can not execute a method which would format the selected Text, as the selected Text of the RTB can not be bound to the ViewModel...</p> <p>How to cope with that ?</p> <p><strong>UPDATE</strong>:</p> <p><strong>ward bell</strong> said: </p> <p>"I am open to some code in the code-behind; ...I draw the line at decision logic. I smell a rat when I see a conditional statement of any kind. That’s where bugs breed. Conditional logic is code we should be testing."</p> <p>source: <a href="http://codebetter.com/blogs/wardbell/archive/2010/03/19/mvvm-josh-smith-s-way.aspx" rel="nofollow noreferrer">http://codebetter.com/blogs/wardbell/archive/2010/03/19/mvvm-josh-smith-s-way.aspx</a></p>
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