How To: Draw HTML Formatted Text

[Marion]

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.

[Phil]

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.

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

[Leledumbo]

How 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

How do I keep track of where I am as I render the text on the Canvas?

Use additional variables. Update as you draw.