- A Cookbook Topic: "Delay", "WaitUntil" and "Let's see actions"

From: [at]} <Alexander>
Date: Fri, 12 May 2006 22:51:23 +0700

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Hello, Marco!

MC> I believe this is just a "Fehler" (mistake in german ~= "misser"), i.e.
MC> something is missing, only, and not completely wrong.
MC> The problem is, that most tracking functions are implemented with busy loops
MC> calling Input. (By the way there exists a way of implementing the same
MC> functions without busy loops!)
MC> If inside of all these busy loops a call to Services.actionHook.Step is
MC> added, the system very much keeps performing the background tasks even
MC> during user interaction.
MC> However, the display is not neccesarily updated, i.e. the cube and the clock
MC> will run, but the update (which is a delayed update) will not be performed
MC> and thus you don't see much effect.
MC> According to me this is no problem as the user while interaction should
MC> focus on other things than a turning cube ;)

  Sadly, Services.actionHook.Step is not documented at all (I've got
  BlackBox 1.5).

  
MC> I think it is very much possible to implement the tracking handling without
MC> any loops at all, though.
MC> The problem indeed is that you shouldn't have the option to ask for the
MC> coordinates.
MC> (The coordinates are passed to you with the message.)

  You are right! : )
  

MC> I believe that the Ports.Input procedure is a dinosaur from the old Ceres
MC> Oberon.
MC> Therefore I pleed that Ports.Input itself must call Services.actionHook.Step
MC> and after that Kernel.Sleep in order to wait at lease 20 ms before doing
MC> anything else, i.e. reading the new mouse coordinates from the windows api.
MC> This tribute would solve the BIG problem.

  This indeed is a simple and elegant solution!
  Thank you very much!
  

MC> Unfortunately Ports.Input might also be called by Actions and thus would
MC> mean a cascaded call to Services.actionHook.Step, which meens a problem.
MC> Therefore Step requires some modification, too.

MC> As I have done my modification on BB 1.4 I will first adapt it to 1.5 and
MC> then publish it.

  That is great, I'm expecting it impatiently.

---=====---
 Alexander

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Received on Fri May 12 2006 - 17:51:23 UTC