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How to get position from char index in RadRichTextEditor

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Aakash Kumar
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Aakash Kumar asked on 12 Jan 2017, 04:58 PM

as RichTextBox has a method like:

Point p = richTextBox1.GetPositionFromCharIndex(3);

 

What is the method for that in RadRichTextEditor?

I want to get position of particular index in RadRichTextEditor.

Thanks in advance

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 13 Jan 2017, 08:49 AM
Hello Aakash Kumar,

Thank you for writing.  

RadRichTextEditor has a specific positioning feature to navigate through document's content and to get information about the document's elements at a specific position. RadDocument uses the positioning to track the movement of the and to control the selection. You can navigate to a specific position in the document and get the DocumentPosition.Location property. Additional information about positioning is available here: http://docs.telerik.com/devtools/winforms/richtexteditor/features/positioning

I hope this information helps. Should you have further questions I would be glad to help.

Regards,
Dess
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Aakash Kumar
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answered on 13 Jan 2017, 11:40 AM

Thanks to Respond Dess.

Actually i need the location of char by index. Like the location of  5th char of radRichTextBox in X and Y axis.

Can you please help me?

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 13 Jan 2017, 11:56 AM
Hello Aakash Kumar, 

Thank you for writing back. 

RadRichTextEditor doesn't provide such an API to get the position by char index directly. The possible solution is to use the DocumentPosition which should be placed at the beginning of the document and move it to the next character by the MoveToNext method. Thus, you can access the desired char's location by index. Here is a sample code snippet:
this.radRichTextEditor1.Text = "Once upon a time";
Telerik.WinForms.Documents.DocumentPosition position = new Telerik.WinForms.Documents.DocumentPosition(this.radRichTextEditor1.Document);
int index = 6;
while (index > -1)
{
    position.MoveToNext();
    index--;
}
Console.WriteLine(position.Location.ToString());

I hope this information helps. If you have any additional questions, please let me know. 

Regards,
Dess
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Aakash
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answered on 13 Jan 2017, 04:31 PM
Thanks dear, thank you very much. 
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sebastien
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answered on 22 Nov 2018, 05:02 PM

Is it possible to get the same function with a RadTextBox ?

Since I'm using a RadExpressionEditorForm, I can't change the type of the [radTextBoxExpression]...

thanks

 

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Dess | Tech Support Engineer, Principal
Telerik team
answered on 23 Nov 2018, 07:51 AM
Hello, Sebastien, 

Note that RadRichTextEditor and RadTextBox have a completely different internal elements structure. Hence, the API is different. RadTextBox also hosts the standard MS TextBox. You can refer to the following general programming forums demonstrating how to get the char value form a position (index). You can get the hosted TextBox by the RadTextBox.TextBoxElement.TextBoxItem.TextBoxControl:
https://stackoverflow.com/questions/5564319/getting-char-from-position-in-c-sharp-textbox
https://social.msdn.microsoft.com/Forums/en-US/c5290a83-c2eb-4b4d-9590-ae76b1e6fb32/textbox-how-to-get-char-position-if-i-know-line-number?forum=csharpgeneral&forum=csharpgeneral

I hope this information helps. 

Regards,
Dess | Tech Support Engineer, Sr.
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Dess | Tech Support Engineer, Principal
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Aakash Kumar
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sebastien
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