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POHow do I maintain RichText formatting (bold/italic/etc) when changing any one element?
 

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  1. POHow do I maintain RichText formatting (bold/italic/etc) when changing any one element?
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    <p>I have a rich text box that may contain a string that has elements of bold, italics, or even different fonts and sizes. If I select the entire string, including all of the differences, how can I "Bold" that string without converting the entire string to the generic font with just a "bold" attribute?</p> <p>For example: I want to turn "This <em>is some</em> <code>text</code>" into "<strong>This <em>is some</em> <code>text</code></strong>"</p> <p>Note that "is some" remained italicized and "text" remained a different font.</p> <p>What I currently have is quite simplistic:</p> <pre><code>private void tsBold_Click(object sender, EventArgs e) { if (rtb.SelectionFont == null) return; Font f; if (tsBold.Checked) f = new Font(rtb.SelectionFont, FontStyle.Bold); else f = new Font(rtb.SelectionFont, FontStyle.Regular); rtb.SelectionFont = f; rtb.Focus(); } </code></pre> <p>Of course, this is going to apply the exact same font to the entire selection. Is there any way to just append "bold" to the existing font(s)?</p> <p><strong>ANSWER</strong> While the "official" answer below is just the tip of the iceberg, it was the push I needed in the right direction. Thank you for the tip.</p> <p>Here's my official fix:</p> <p>I added this to my RichTextBox object:</p> <pre><code> /// &lt;summary&gt; /// Change the richtextbox style for the current selection /// &lt;/summary&gt; public void ChangeFontStyle(FontStyle style, bool add) { //This method should handle cases that occur when multiple fonts/styles are selected // Parameters:- // style - eg FontStyle.Bold // add - IF true then add else remove // throw error if style isn't: bold, italic, strikeout or underline if (style != FontStyle.Bold &amp;&amp; style != FontStyle.Italic &amp;&amp; style != FontStyle.Strikeout &amp;&amp; style != FontStyle.Underline) throw new System.InvalidProgramException("Invalid style parameter to ChangeFontStyle"); int rtb1start = this.SelectionStart; int len = this.SelectionLength; int rtbTempStart = 0; //if len &lt;= 1 and there is a selection font then just handle and return if (len &lt;= 1 &amp;&amp; this.SelectionFont != null) { //add or remove style if (add) this.SelectionFont = new Font(this.SelectionFont, this.SelectionFont.Style | style); else this.SelectionFont = new Font(this.SelectionFont, this.SelectionFont.Style &amp; ~style); return; } using (EnhancedRichTextBox rtbTemp = new EnhancedRichTextBox()) { // Step through the selected text one char at a time rtbTemp.Rtf = this.SelectedRtf; for (int i = 0; i &lt; len; ++i) { rtbTemp.Select(rtbTempStart + i, 1); //add or remove style if (add) rtbTemp.SelectionFont = new Font(rtbTemp.SelectionFont, rtbTemp.SelectionFont.Style | style); else rtbTemp.SelectionFont = new Font(rtbTemp.SelectionFont, rtbTemp.SelectionFont.Style &amp; ~style); } // Replace &amp; reselect rtbTemp.Select(rtbTempStart, len); this.SelectedRtf = rtbTemp.SelectedRtf; this.Select(rtb1start, len); } return; } </code></pre> <p>I then changed the click methods to use the following pattern:</p> <pre><code> private void tsBold_Click(object sender, EventArgs e) { enhancedRichTextBox1.ChangeFontStyle(FontStyle.Bold, tsBold.Checked); enhancedRichTextBox1.Focus(); } </code></pre>
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    1. COWhy is this so hard in WinForms? It's a trivial [`EM_SETCHARFORMAT`](http://msdn.microsoft.com/en-us/library/bb774230(v=VS.85).aspx) at the Win32 level. Since you have the window handle at hand, can't you do it that way?
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      1. USDavid Heffernan
 

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