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POHow to completely clear/set text of WinRT's RichEditBox?
 

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  1. POHow to completely clear/set text of WinRT's RichEditBox?
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    <p>How does one completely overwrite or clear the text (and formatting) of WinRT's RichEditBox?</p> <p>I'm asking because the method <a href="http://msdn.microsoft.com/pl-pl/library/windows/apps/windows.ui.text.itextdocument.settext" rel="nofollow">SetText</a> of it's Document property seems only to append new text.</p> <p>Thus the "binding" as below:</p> <pre><code>void Vm_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e) { if (e.PropertyName == "Content") richEditBox.Document.SetText(Windows.UI.Text.TextSetOptions.None, Vm.Content); } private void ContentChanged(object sender, RoutedEventArgs e) { RichEditBox box = (RichEditBox)sender; string content; box.Document.GetText(Windows.UI.Text.TextGetOptions.None, out content); Vm.Content = content; } </code></pre> <p>where <code>Vm_PropertyChanged</code> just listens for changes in the <code>Content</code> string property of the ViewModel and <code>ContentChanged</code> is a handler for <code>TextChanged</code> event of the RichEditBox, will create an infinite loop constantly appending "\r" to the Vm.Content and the box's text itself. When you replace <code>TextGetOptions.None</code> with <code>TextGetOptions.FormatRtf</code> the ViewModel's <code>Content</code> property gets even more messy adding something that looks like empty RTF paragraphs.</p> <p>Here's the Content property definition in the ViewModel so you can ensure that everything's ok with it:</p> <pre><code> /// &lt;summary&gt; /// The &lt;see cref="Content" /&gt; property's name. /// &lt;/summary&gt; public const string ContentPropertyName = "Content"; private string _content; /// &lt;summary&gt; /// Sets and gets the Content property. /// Changes to that property's value raise the PropertyChanged event. /// &lt;/summary&gt; public string Content { get { return _content; } set { if (_content == value) { return; } RaisePropertyChanging(ContentPropertyName); _content = value; RaisePropertyChanged(ContentPropertyName); } } </code></pre> <p>EDIT:</p> <p>Some experiments:</p> <pre><code> richEditBox.Document.SetText(Windows.UI.Text.TextSetOptions.None, string.Empty); string content; richEditBox.Document.GetText(Windows.UI.Text.TextGetOptions.None, out content); //content became "\r" richEditBox.Document.SetText(Windows.UI.Text.TextSetOptions.None, content); richEditBox.Document.GetText(Windows.UI.Text.TextGetOptions.None, out content); //content became "\r\r" </code></pre> <p>EDIT:</p> <p>Another experiment:</p> <p>A simple workaround for <code>TextGetOptions.None</code> is trimming that extra "\r" on output. However with <code>TextGetOptions.FormatRtf</code> things aren't just that simple:</p> <pre><code> RichEditBox box = new RichEditBox(); box.Document.SetText(Windows.UI.Text.TextSetOptions.FormatRtf, string.Empty); string content; box.Document.GetText(Windows.UI.Text.TextGetOptions.FormatRtf, out content); //content is now // {\\rtf1\\fbidis\\ansi\\ansicpg1250\\deff0\\nouicompat\\deflang1045{\\fonttbl{\\f0\\fnil Segoe UI;}}\r\n{\\colortbl ;\\red255\\green255\\blue255;}\r\n{\\*\\generator Riched20 6.2.9200}\\viewkind4\\uc1 \r\n\\pard\\ltrpar\\tx720\\cf1\\f0\\fs17\\lang1033\\par\r\n}\r\n\0 box.Document.SetText(Windows.UI.Text.TextSetOptions.FormatRtf, content); box.Document.GetText(Windows.UI.Text.TextGetOptions.FormatRtf, out content); //and now it's // {\\rtf1\\fbidis\\ansi\\ansicpg1250\\deff0\\nouicompat\\deflang1045{\\fonttbl{\\f0\\fnil Segoe UI;}{\\f1\\fnil Segoe UI;}}\r\n{\\colortbl ;\\red255\\green255\\blue255;}\r\n{\\*\\generator Riched20 6.2.9200}\\viewkind4\\uc1 \r\n\\pard\\ltrpar\\tx720\\cf1\\f0\\fs17\\lang1033\\par\r\n\r\n\\pard\\ltrpar\\tx720\\f1\\fs17\\par\r\n}\r\n\0 </code></pre> <p>I apologize for my English. All corrections concerning it are also welcome :)</p>
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