Custom code formatting extension

Question

Hi Folk,

I want to create extension that change tab offsets in custom manners,  while overriding tab offsets in ITextParagraphPropertiesFactoryService I noticed that sometimes it takes 1 or more seconds to indent other lines

Here is the code I have created, don't pay attention to the logic, I just put rand for the sample, running this code you can feel a delay between two line formattion

[Export(typeof(ITextParagraphPropertiesFactoryService))]
	[ContentType("code")]
	public class MyParagraphPropertiesFactoryService : ITextParagraphPropertiesFactoryService
	{
		ITextVersion oldVersion;
		double offSet;

		public TextParagraphProperties Create(IFormattedLineSource formattedLineSource, TextFormattingRunProperties textProperties,
		IMappingSpan line, IMappingPoint lineStart, int lineSegment)
		{
			var curV = formattedLineSource.SourceTextSnapshot.Version;
			if (oldVersion != curV)
			{
				Random rand = new Random();
				offSet = formattedLineSource.ColumnWidth * 10 + rand.Next() % 50;
				oldVersion = curV;
			}
			return new MyParagraphProperties(textProperties, formattedLineSource, 10, offSet);
		}
	}
	public class MyParagraphProperties : TextFormattingParagraphProperties
	{
		List<TextTabProperties> _tabs;
		double offset;
		public MyParagraphProperties(TextFormattingRunProperties textProperties, IFormattedLineSource formattedLineSource, int firstTabSize, double offSet)
			:
		   base(textProperties, formattedLineSource.ColumnWidth * (double)formattedLineSource.TabSize)
		{
			ColumnWidth = formattedLineSource.ColumnWidth;
			FirstTabSize = firstTabSize;
			offset = offSet;
		}
		public override IList<TextTabProperties> Tabs
		{
			get
			{
				return new List<TextTabProperties> { new TextTabProperties(TextTabAlignment.Left, offset, 0, 0) }; ;
			}
		}

		public double ColumnWidth { get; set; }
		public int FirstTabSize { get; set; }
	}

So the question is, is this correct way to write custom tab formatter? if yes, why visual studio deals so slow with it? are there any ways to give different tab indent for different tabs in the same line?

Thanks,
Arsen

Answer 1

Hi Arsen,

I think you can write your custom tab formatter as you did. But I don't know why it dealt so slow.

This reference may be helpful to you:http://www.go4answers.com/Example/programatically-invalidate-certain-4975.aspx

Best regards,

Disley

Answer 2

Hi Disley,

Thanks for response, I will take a look to the url you drop in message ang get you back with result

Arsen

Answer 3

Hi Disley,

It doesn't seems to work, again it takes few seconds to refresh formatting, I can send you sources to review if you drop mail here, or write me mkrtchyan.arsen at gmail com. what do you think about making fake edit? could it refresh formatting?

Arsen 

Answer 4

I have created sample here which shows that ITextParagraphFactoryService formats text slow, could you please find few mintues to review?

Thanks,

Arsen