Drawing custom TextBox Controls

I found this code here which explains how to create custom controls. I have been using 开发者_如何转开发these controls as buttons, but now that I am beginning to understand the code a bit more, I would like to try and create a text box control using the same drawing techniques. I have been searching endlessly for some examples on the subject, but cannot find a single one. I don't understand how a textbox can be writable if a rectangle is being used to make it. Does anybody have any experience creating custom controls in C#? I would like for my textbox to be able to match the theme in the above link which is why it has to be custom made.

Well, at the beginning you should have in mind, that the implementation of new text box control is kinda complicate thing. It is necessary that you consider the following points:

1) What should your textbox do? How can the user interact with it? Which events do you necessarely throw? 2) How should you textbox be drawn? Is it a simple box with an outline or do you have elements which are different if the user gets interacted.

A good starting point for implementing your own textbox is to look how it works under the hood - in fact, you should start by referencing to samples which came from the DirectX and DirectDrawing area, one example is the following link (the sample is for c++, but the concepts are the same as used in windowsforms or wpf drawing):

http://www.uc-forum.com/forum/d3d-tutorials-and-source/65377-make-textbox-ingame-console-directx.html

a more direct sample (explaining howto extend an existing textbox) can be found here: http://www.codedblog.com/2007/09/17/owner-drawing-a-windowsforms-textbox/

All in all, to achieve your goal try to extend the basic text box at the beginning and afterwards start with a component which is not that complicated, for example a simple checkbox. Go on and at the end you will be able to implement your own textbox control ;)