How To: Draw HTML Formatted Text
lazarus / 39-Graphics

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Marion · 2012-08-17 17:28

I have to write a control (TLabel) that will accepted simple HTML tags
and render the rich text on the control canvas. I am wondering if
anyone has found a tutorial on the best practices for this. Some of
the questions I have are:

How do you anticipate word breaks?
How do you calculate the total RECT since some of the lines may be
different heights?
How do I keep track of where I am as I render the text on the Canvas?

Any hints on how to do this will be appreciated.

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Phil · 2012-08-17 17:33

Quote from: Marion on August 17, 2012, 07:28:53 pmI have to write a
control (TLabel) that will accepted simple HTML tags and render the
rich text on the control canvas. I am wondering if anyone has found a
tutorial on the best practices for this. Some of the questions I have
are:

How do you anticipate word breaks?
How do you calculate the total RECT since some of the lines may be
different heights?
How do I keep track of where I am as I render the text on the Canvas?

Any hints on how to do this will be appreciated.

This might be more than you need:

http://wiki.lazarus.freepascal.org/THtmlPort

You might be able to use a narrow THtmlViewer as a label.

In any case, you can see how it renders HTML.

Thanks.

-Phil

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Leledumbo · 2012-08-17 21:43

QuoteHow do you anticipate word breaks?
How do you calculate the total RECT since some of the lines may be
different heights?By making a good use of TextExtent
QuoteHow do I keep track of where I am as I render the text on the
Canvas?Use additional variables. Update as you draw.