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Hello, Marco!
MC> Here the changes I have made so far.
MC> As I see they are minimal. For convenience I'm attaching the entire Files.
MC> Remarks:
MC> * The ASSERT 99 in HostPorts.Rider.Input is important to detect Actions
MC> calling Input.
MC> * In TextControllers I just removed a very useless dummy call to Input.
Very useless indeed.
MC> * Services actually didn't need any changes as ActionHook.Step already skips
MC> cascaded calls.
For my use I replaced ASSERT with simple IF like here:
IF ~Services.ActionRunning() THEN (* ASSERT was here *)
ticks := Services.Ticks();
Services.actionHook.Step; (* mc:060325 *)
KERNEL32.Sleep(SHORT(MAX(20 - (Services.Ticks() - ticks), 0)));
END;
I did this after I discovered an Action object using Input. It was
CpcControlTips.Action polling mouse coordinates in the background.
I see no harm in such activity, so I just disabled the recursive
call to Services.actionHook.Step and removed KERNEL32.Sleep which is
unnecessary when called from an Action. So, this way Action objects
may use Input as before, and the main application loop takes
advantage of the patch.
MC> Main Problem:
MC> So far a Loop on Input would allow a tracking procedure to obtain the
MC> required user interaction without worry about the state of the system being
MC> changed.
MC> As Actions might very much change the state and typically also will change
MC> the state of views or even replace views these Tracking Functions suddenly
MC> have to face some reality like "Oh, the view I just had under the mouse
MC> pointer is suddenly a different one!"
MC> This is why I earlier said that Input should not be available at all.
MC> Instead the Tracking Messages should be handled differently.
MC> I am not 100% sure if this is possible in all cases and how big the change
MC> will be.
MC> But I guess this will be the first change I'll make to BB.
The Main Problem you mentioned suggests that changes should be quite
big. (I thought of it before you introduced the patch, but I am just
not so familiar with the framework to try to fix it.) In fact, a
tracking procedure must copy and remember all information about the
state of the system being changed, and then verify and update that
information after every bit of tracking event. If the state in question
was changed from outside the tracking procedure (like from an
Action) - a decision must be made if the tracking should be aborted.
Maybe some sort of mouse tracker objects need to be incorporated
into the framework? Or can it be done using available hooks?
---=====---
Alexander
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Received on Tue May 23 2006 - 22:29:43 UTC