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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Dear Martin:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">I understand John’s point: you want all the user installed filters and handlers across all levels to be processed before switching to system level processing. I also understand this
prioritization proposal is designed to push our existing set of system handlers to a separate phase. But is that all we’re talking about here? I need some clarification.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">If I understand this correctly, this proposal advocates making drastic changes to the event handling mechanism. Not only it introduces the prioritization scheme (which I support),
but it also alters the way events are bubbled up, by introducing waves/phases. I am afraid I don’t see the use case for doing that. In my opinion, the prioritization scheme should work on handlers added to the same EventTarget. There should be no multiple
waves - if an event gets consumed by an event handler, the dispatching should stop (that change I also support), if not - it bubbles up the hierarchy.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Within a given control the order of event processing gets involved. If a Control is subclassed the subclass should get first shot at the event. The same is true for Behaviors and Skins.
Beyond that I’m still not clear if the behavior or skin should get the event first or if the skin should get it via the behavior or the other way around. In any case, you’ve got the control, the behavior, the skin, and all of their subclasses trying to sort
out the execution order.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Hmmm. I am not sure I understand exactly what you are saying.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">The way I understand this prioritization proposal is that we introduce a priority associated with the handler (and not the filter). The proposal specifies 3 priority levels,
I think there might be more, or perhaps we even have an int priority (might be too much freedom, let’s discuss).<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Specifically, I think there might be 5 levels, from high to low (the names are just for the purposes of discussion):<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">{ AppHigh, SkinHigh, AppMedium, SkinLow, AppLow }<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">This way there is absolutely no ambiguity in deciding which handler gets invoked first. I must note that SkinHigh, SkinLow should not be available to the application code.
At the same time, AppHigh,AppMedium,AppLow levels should not be available to skins/behaviors.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Side question: should filters also have priority?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Based on this discussion (and I might be mistaken on this) it sounds like you're trying to handle all this using this proposal, namely registering event handlers with a prioritization
scheme.</span><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Wait, I though that’s what you are proposing, based on the doc
<a href="https://gist.github.com/mstr2/4bde9c97dcf608a0501030ade1ae7dc1">https://gist.github.com/mstr2/4bde9c97dcf608a0501030ade1ae7dc1</a><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Are you proposing something else, or is something missing from the doc?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:11.0pt">Wouldn’t it be easier to just grab the event and pass it around using Java method calls? Perhaps the call is handleEvent(). A control implements handleEvent() by passing the event
off to the behavior’s handleEvent() which passes it off to the skin’s handleEvent(). The skin sends it up the superclass chain by calling super.handleEvent(), etc. so on.</span><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Wouldn’t this be a drastic departure from the established event handling method? Why call an empty method if we are not interested in the event? Or maybe I misunderstood
you here, what are you asking?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">To summarize, I think the idea of explicit priority is a good idea as it solves the current issue or exact ordering of handlers in the event of skin change, to give one example.
I think we might also benefit from a limited set of priorities (5) that reflect the reality of fx having two sides - the application side and the “system”, or skin/behavior, side.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Personally, I find some other ideas problematic: I don’t see a good use case for multiple waves in dispatching, as this represent a major departure from the current mechanism,
unless I am missing something.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">I don’t understand the paragraph about subclassing. Perhaps you mean that if we have a situation where one class extends the other, they should coordinate the event handling.
For example, the base class would declare the handling method, register it as a listener, for the child class to override and get the events? Or the base class should not add any handlers, instead leaving it up to the child class? But that’s implementation
detail.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">What do you think?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">-andy<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt;color:black">From:
</span></b><span style="font-size:12.0pt;color:black">Martin Fox <martin@martinfox.com><br>
<b>Date: </b>Tuesday, October 31, 2023 at 10:13<br>
<b>To: </b>Andy Goryachev <andy.goryachev@oracle.com><br>
<b>Cc: </b>Michael Strauß <michaelstrau2@gmail.com>, openjfx-dev <openjfx-dev@openjdk.org><br>
<b>Subject: </b>[External] : Re: Prioritized event handlers<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">I understand John’s point: you want all the user installed filters and handlers across all levels to be processed before switching to system level processing. I also understand this prioritization proposal
is designed to push our existing set of system handlers to a separate phase. But is that all we’re talking about here? I need some clarification.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Within a given control the order of event processing gets involved. If a Control is subclassed the subclass should get first shot at the event. The same is true for Behaviors and Skins. Beyond that I’m still
not clear if the behavior or skin should get the event first or if the skin should get it via the behavior or the other way around. In any case, you’ve got the control, the behavior, the skin, and all of their subclasses trying to sort out the execution order.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Based on this discussion (and I might be mistaken on this) it sounds like you're trying to handle all this using this proposal, namely registering event handlers with a prioritization scheme. Wouldn’t it be
easier to just grab the event and pass it around using Java method calls? Perhaps the call is handleEvent(). A control implements handleEvent() by passing the event off to the behavior’s handleEvent() which passes it off to the skin’s handleEvent(). The skin
sends it up the superclass chain by calling super.handleEvent(), etc. so on.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">This would make for an easy sell to outside developers. We can tell them that if they subclass a Control and implement handleEvent() they will get events first during the system phase. The same is true if
they subclass a behavior or skin. They don’t need to buy into or even see a complicated event prioritization scheme to get exactly what they expect, namely first access to events.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">But, again, maybe I’m off base here. Let me know.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Martin<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><br>
<br>
<o:p></o:p></span></p>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
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<p class="MsoNormal"><span style="font-size:11.0pt">On Oct 30, 2023, at 12:53 PM, Andy Goryachev <andy.goryachev@oracle.com> wrote:<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Dear Michael:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Thank you, this is very helpful.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Questions/Comments:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">1. Does this proposal changes the way events are dispatched with respect to priority? In other words, does it first go through the list of all handlers registred on the leaf
Node (high priority first, then lower, then lowest), then bubble up? Or do they propagate upwards looking for high priority handlers first, then the process restarts for lower priorities, as I saw in some previous emails? (I could be mistaken)</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">2. Do you propose to abort event dispatching immediately after the event is consumed? This probably should be mentioned earlier in the Motivation (the problem statement) section.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">3. I wonder if three priority levels are sufficient. Let me explain. We have two possible actors who can register an event listener: the application code and the FX (or,
rather more specifically, the skin and its behavior, whatever that might be).</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Application code might want to add handlers at three possible priorities:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<span style="font-family:"Iosevka Fixed SS16"">App handler must always be called before any fx handler</span><span style="font-size:10.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-top:0in;margin-bottom:0in;mso-list:l1 level1 lfo1">
<span style="font-family:"Iosevka Fixed SS16"">App hander does not care</span><span style="font-size:10.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-top:0in;margin-bottom:0in;mso-list:l1 level1 lfo1">
<span style="font-family:"Iosevka Fixed SS16"">App handler must always be called after any fx handlers</span><span style="font-size:10.0pt"><o:p></o:p></span></li></ul>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">For fx/skin handlers we might have fewer levels:</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<span style="font-family:"Iosevka Fixed SS16"">Skin handler does not care</span><span style="font-size:10.0pt"><o:p></o:p></span></li><li class="MsoListParagraph" style="margin-top:0in;margin-bottom:0in;mso-list:l0 level1 lfo2">
<span style="font-family:"Iosevka Fixed SS16"">Skin handler must be called after all other skin handlers</span><span style="font-size:10.0pt"><o:p></o:p></span></li></ul>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">This situation maps to 5 priorities and 4 effective levels (or 5).</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">We should also mention the fact that when any actor adds two or more handlers for the same event with the same priority, they get invoked in the order added.</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Would you agree, or am I missing some critical aspect of the proposed solution?</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">Thank you</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16"">-andy</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Iosevka Fixed SS16""> </span><o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><b><span style="font-size:12.0pt">From:<span class="apple-converted-space"> </span></span></b><span style="font-size:12.0pt">openjfx-dev <openjfx-dev-retn@openjdk.org> on behalf of Michael Strauß <michaelstrau2@gmail.com><br>
<b>Date:<span class="apple-converted-space"> </span></b>Friday, October 27, 2023 at 19:41<br>
<b>To:<span class="apple-converted-space"> </span></b>openjfx-dev <openjfx-dev@openjdk.org><br>
<b>Subject:<span class="apple-converted-space"> </span></b>Re: Prioritized event handlers</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Here is the proposal:<br>
<a href="https://urldefense.com/v3/__https:/gist.github.com/mstr2/4bde9c97dcf608a0501030ade1ae7dc1__;!!ACWV5N9M2RV99hQ!NvO4B-fpHrjczoDGCoctorfNPX48w38MvW-LOf6ElCk0dBqFX_xPlETcr56POnEaBcwENrIOsX4OKDM0OGc07A$">https://gist.github.com/mstr2/4bde9c97dcf608a0501030ade1ae7dc1</a><br>
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Comments are welcome.<br>
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<br>
On Fri, Oct 27, 2023 at 8:21 PM Andy Goryachev<br>
<andy.goryachev@oracle.com> wrote:<br>
><br>
> Would it be possible to create a proposal in the JEP format outlining the proposed public API?<br>
><br>
><br>
><br>
> Thank you<br>
><br>
> -andy</span><o:p></o:p></p>
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