Re: edit control from scratch

"AliR \(VC++ MVP\)" <AliR@online.nospam>
Wed, 22 Apr 2009 11:28:28 -0500
You know that you can change the edit control style to display itself in 2D,
and you change the font, and the text color and the background color of the
edit control.

Here is how to change the background color:

You can figure out the text color from there.


"asellon" <> wrote in message

thanks for replying. I am making the control from scratch because the
entire view of the application is a radar screen. Hence everything is 2D
Graphics.. including all controls. And all controls are created and drawn
by my code.

funny thing is, if I could just see how someone implemented the CEditBox
all the way down to the nuts and bolts, that would totally show me what to

but of course that won't happen.

thanks for the hex editor example.

"AliR (VC++ MVP)" <AliR@online.nospam> wrote in message

I like to ask why you are doing all your controls from scratch, most
windows controls are highly configurable!?
Let me also point out that there is no such thing as an MFC control, all
the controls that you have access to are windows controls that are
available whether you are using MFC or SDK or ATL...

Anyway, writing an edit control from scratch, although an arduous task,
is not all that difficult. If not done correctly you will endup with
alot of flicker (things like when new chars are typed in not refreshing
the entire control). The hardest part of the whole thing would be the
line wrapping part (keeping track of where the line breaks should happen,
and keeping track of the current index as the user goes from one line to

Here is a HexEditor that I wrote a while back, maybe it will help out a


"asellon" <> wrote in message

 I am using MFC as the basis of my application, but all visual
components are drawn using GDI. I don't use any common controls nor do I
derive from any common controls.

Something I need, however, is a control that works like an edit box. I
currently have a control manager object that manages drawing the
controls, checking them for hover and click, and so on.

Each control is simply a rectangle of some arbitrary size with the
ability to have children controls inside, much like panels have edit
boxes and so on in .NET development.

So for an edit control in my world, I have a rectangle that is sized of
the font I am using(Hershey fonts are being used... so vector fonts, not
windows fonts). It has a border(a simple line outlining it). It does
not have to respond to highlighting or drag and drop.

So, the questions.

I can't see MS source code for their edit control to get ideas, so I
thought Java Swing... but I don't know much about the open source-ness
of that stuff. Does some one know of source code somewhere that creates
an edit box and does not use an MFC control derivation to do it?

What would be the best container to back the edit control up with? It
needs to accept characters and strings, which is no problem. But
currently, the idea I have is to use a vector or string from the STL to
store the characters in. Why?

Because the edit control I am making allows movement throughout by arrow
keys and if I have the cursor at a position other than the end and I
start typing, I need to insert the characters at that position in the
character array.

That said, on each redraw, the control needs a CString sent to my
hershey font class in order to draw the string. That part I have
handled as well, in theory.

So... there are tons of resources for making an edit control out of an
already edittable type of control such as an MFC control. What about
starting from complete scratch?

Of course, any ideas about any of this are appreciated. Insults and
ridicule as well. I would just like to get moving forward in a good
fashion towards a solid design for this control.

Thanks for the help, and if this is the wrong place for this, just let
me know.


Oh, and Dr Newcomer. If you read this, I need to send you an email
about your async socket classes. I would like your advice and keen eye
on something in reference to that if you could spare some time for me.
If not, that will have to be fine as well.

Thank you.

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