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wait user action in Delphi

Posted on 2011-03-08
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Last Modified: 2012-05-11
I am developping Delphi GUI application
That application process "commands" that come from a "script" (via a for loop)
Some commands request the user to do some "action"
For example, the user has to confirm something : I do this with a "modal" request.
But now, some command requests the user to click on a button on the form.
Only when the user will click on that will the "process" continue its execution.
Another command "asks" the user to drag and drop something on the form
Etc..
What is the easiest way to achieve this ? (events, timer, flags ...)
A sample is welcome...
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Question by:LeTay
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4 Comments
 
LVL 19

Accepted Solution

by:
Thommy earned 500 total points
ID: 35068287
1.) Set global variable, when your script reaches the point, where user interaction is required
STOP:=true;

2.) Pause your script in a WHILE loop
WHILE Stop do begin
  Application.ProcessMessages;
end;

3.) If user has done his work, reset global variable in OnClick or OnDrag events to continue your script
STOP:=false;
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Author Closing Comment

by:LeTay
ID: 35068735
More simple than that is difficult !
Many thanks Tommy
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LVL 38

Expert Comment

by:Geert Gruwez
ID: 35069320
it all depends on how you have setup your script to run

let's assume that you want feedback from the script ... it's progress
and that you want a responsive app
and you want user input via the front-end

you still need to divide the script in 2 divisions
1: all user input is asked before the script starts
2: user input depends on results from inside the script

from all the apps i have written/maintained,
having to use application.processmessages indicates a flaw in design

threads are the best approach to solve this problem
and syncronisation objects to control the flow
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LVL 38

Expert Comment

by:Geert Gruwez
ID: 35069332
ah it was closed already ...
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