Search
Support DFF
If you benefit from the website, in terms of
knowledge, entertainment value, or something otherwise useful,
consider making a donation via PayPal to help defray the
costs. (No PayPal account necessary to donate via credit
card.) Transaction is secure.
If you shop at Amazon anyway,
consider using this link. We receive a few cents from each purchase.
Thanks.
Contact
Feedback:
Send an e-mail with your
comments about this program (or anything else).
|
| |
I received this email the other day:
I want to develop an application which generates a
random, three part code using three colours. These colours can be repeated
during the sequence. The main point im struggling with is that i want the user
to drag and drop the colours into a guess sequence.
This is basically the main features of the program
and i wondered if you can give me some feedback on how to code it.
I decided to start with the drag-drop part just to see how simple it could be
accomplished. Even I was surprised by the answer - only two lines of code
to accomplish the "guess" part of the above program description!
Here they are:
- In a OnDragOver event exit for the target spaces, we need to set
"Accept := true;" to tell the
systems that it is OK to drop the color here.
- In the OnDragDrop event exit we must set the target's color to the
dragged object's color. In our case, we are dragging one of several
colored TShapes to a target TShape so the 2nd line of code is
"Tshape(sender).brush.color := Tshape(source).brush.Color;"
The other key step is change DragMode property of the objects to be
dragged from dmManual to dmAutomatic.
That's it.
Download Source Code
| Created: March 23, 2004 |
Modified: November 07, 2008
|
|
