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continue analysis regarding command invocation (#1070)

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...turns out to be a nasty subject, now we're able to see
in more concrete detail how this interaction needs to be carried out.
Basically this is a blocker for the top-level, since it is obviously
some service in top-level, which ultimately becomes responsible for
orchestrating this activity
This commit is contained in:
Fischlurch 2017-03-05 02:53:04 +01:00
parent 4acb9be4d2
commit 2f538f5f95
2 changed files with 357 additions and 11 deletions
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17
wiki/renderengine.html
View file

@ -2582,7 +2582,7 @@ This contrastive approach attempts to keep knowledge and definition clustered in
→ GuiCommandCycle
</pre>
</div>
<div title="GuiCommandCycle" creator="Ichthyostega" modifier="Ichthyostega" created="201703031817" modified="201703032258" tags="design operational GuiPattern GuiIntegration draft discuss" changecount="10">
<div title="GuiCommandCycle" creator="Ichthyostega" modifier="Ichthyostega" created="201703031817" modified="201703050151" tags="design operational GuiPattern GuiIntegration draft discuss" changecount="14">
<pre>//the process of issuing a session command from the UI//
Within the Lumiera UI, we distinguish between core concerns and the //local mechanics of the UI.// The latter is addressed in the usual way, based on a variation of the [[MVC-Pattern|http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller]]. The UI toolkit set, here the GTK, affords ample ways to express actions and reactions within this framework, where widgets in the presentation view are wired with the corresponding controllers vice versa (GTK terms these connections as //&quot;signals&quot;//, we rely on {{{libSigC++}}} for implementation).
A naive approach would extend these mature mechanisms to also cover the actual functionality of the application. This compelling solution allows quickly to get &quot;something tangible&quot; up and running, yet -- on the long run -- inevitably leads to core concerns being tangled into the presentation layer, which in turn becomes hard to maintain and loaded with &quot;code behind&quot;. Since we are here &quot;for the long run&quot;, we immediately draw the distinction between UI mechanics and core concerns. The latter are, by decree and axiom, required to perform without even an UI layer running. This decision gives rise to the challenge how to form and integrate the invocation of ''core commands'' into the presentation layer.
@ -2594,8 +2594,21 @@ In a nutshell, we understand each such core command as a ''sentence'', with a //
To gain some understanding of the topic, we pose the question &quot;who has to deal with core commands&quot;?
* the developer of ~Proc-Layer, obviously. The result of that development process is a set of [[command definitions|CommandHandling]], which get installed during start-up of the SessionSubsystem
* global menu actions (and keybindings) want to issue a specific command, but possibly also need context information
* a widget, button or context-menu binding typically want to trigger a command on some [[tangible element|UI-Element]] (widget or controller)
* a widget, button or context-menu binding typically want to trigger a command on some [[tangible element|UI-Element]] (widget or controller), but also needs to prepare the arguments prior to invocation
* some InteractionStateManager observes contextual change and needs to mark possible consequences for invoking a given command
from these use cases, we can derive the //crucial activities for command handling...//
;instance management
:our commands are prototypes; we need to manage instances for binding concrete arguments
:there is a delay between issuing a command in the UI and dispatching it into the session (and dispatch happens in another thread)
:moreover, there is an &quot;air-gap&quot; when passing a command invocation via ~UI-Bus and Interface System
;forming and enrichment of invocation state
:interactions might happen in the form of ''gestures''
:consequently, interaction state is picked up from context, during an extended time span prior to the invocation
;access to the right ~InteractionStateManager
:a widget just wants to invoke a command, yet it needs the help of &quot;some&quot; InteractionStateManager for
:* creating the command instance, so arguments can be bound
:* fill in missing values for the arguments, depending on context
</pre>
</div>
<div title="GuiConnection" modifier="Ichthyostega" created="200812050543" modified="201703031816" tags="GuiIntegration overview" changecount="9">

351
wiki/thinkPad.ichthyo.mm
View file

@ -2043,8 +2043,8 @@
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<node CREATED="1488419973349" ID="ID_1855791702" MODIFIED="1488419978923" TEXT="brauche ein Konzept">
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@ -2177,8 +2177,14 @@
<node CREATED="1486763350764" ID="ID_1309124609" MODIFIED="1488420106546" TEXT="Aufgaben">
<icon BUILTIN="yes"/>
<node CREATED="1486763355739" ID="ID_745725927" MODIFIED="1486763370261" TEXT="Bindung f&#xfc;r Aktionen bereitstellen"/>
<node CREATED="1488566356774" ID="ID_969011841" MODIFIED="1488566387030" TEXT="Ankerpunkt zum Bilden der Commands">
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<node CREATED="1488566405248" ID="ID_355508260" MODIFIED="1488566425745" TEXT="auffinden der Command-IDs">
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</node>
<node CREATED="1488566427445" ID="ID_567418101" MODIFIED="1488566441831" TEXT="InteractionStateManager">
<node CREATED="1488566447466" ID="ID_1978593319" MODIFIED="1488566452134" TEXT="h&#xe4;ngen darunter"/>
<node CREATED="1488566452538" ID="ID_1569803797" MODIFIED="1488566471539" TEXT="werden transient gebilet"/>
@ -2238,6 +2244,7 @@
</node>
</node>
</node>
<node CREATED="1488672665626" ID="ID_590886664" MODIFIED="1488672675810" TEXT="Grundlagen f&#xfc;r Command-handling"/>
<node CREATED="1487313769425" FOLDED="true" ID="ID_728232011" MODIFIED="1488423342542" TEXT="Grundlagen f&#xfc;r InteractionControl">
<node CREATED="1488419854029" ID="ID_932507511" MODIFIED="1488419868604" TEXT="erst mal: Konzept">
<icon BUILTIN="help"/>
@ -2479,12 +2486,33 @@
<icon BUILTIN="yes"/>
</node>
</node>
<node COLOR="#338800" CREATED="1486520281897" ID="ID_827558797" MODIFIED="1486768117891" TEXT="Problem: zwei Inseln">
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1488677721565" ID="ID_850989325" MODIFIED="1488678049693" TEXT="Problem: Zugang">
<linktarget COLOR="#a9b4c1" DESTINATION="ID_850989325" ENDARROW="Default" ENDINCLINATION="183;-575;" ID="Arrow_ID_1002016515" SOURCE="ID_1520540731" STARTARROW="None" STARTINCLINATION="341;286;"/>
<linktarget COLOR="#9f5680" DESTINATION="ID_850989325" ENDARROW="Default" ENDINCLINATION="211;189;" ID="Arrow_ID_1007188680" SOURCE="ID_827179653" STARTARROW="None" STARTINCLINATION="908;-975;"/>
<icon BUILTIN="flag-pink"/>
<node CREATED="1488677729388" ID="ID_764102285" MODIFIED="1488677736385" TEXT="grunds&#xe4;tziches Problem">
<icon BUILTIN="messagebox_warning"/>
<node CREATED="1488678069565" ID="ID_346104238" MODIFIED="1488678076272" TEXT="explizite Verdrahtung scheidet aus"/>
<node CREATED="1488678077236" ID="ID_1536759032" MODIFIED="1488678099334" TEXT="klassisches Inversion-Of-Control">
<icon BUILTIN="idea"/>
</node>
<node CREATED="1488678106024" ID="ID_1242521430" MODIFIED="1488678110761" TEXT="access by name">
<font ITALIC="true" NAME="SansSerif" SIZE="12"/>
</node>
</node>
<node CREATED="1488677737419" ID="ID_1621219441" MODIFIED="1488677750577" TEXT="einfach gel&#xf6;st f&#xfc;r top-Level">
<icon BUILTIN="ksmiletris"/>
</node>
<node CREATED="1488677751537" ID="ID_75445042" MODIFIED="1488677761574" TEXT="schwierig f&#xfc;r Widgets">
<icon BUILTIN="smily_bad"/>
</node>
</node>
<node COLOR="#338800" CREATED="1486520281897" ID="ID_827558797" MODIFIED="1488677772308" TEXT="Problem: zwei Inseln" VSHIFT="16">
<arrowlink COLOR="#464b68" DESTINATION="ID_1847844548" ENDARROW="Default" ENDINCLINATION="35;-168;" ID="Arrow_ID_1483178089" STARTARROW="Default" STARTINCLINATION="-2;95;"/>
<icon BUILTIN="button_ok"/>
<node CREATED="1486520289382" ID="ID_1944158920" MODIFIED="1486520302679" TEXT="CoreService + UI-Bus"/>
<node CREATED="1486520303173" ID="ID_306583765" MODIFIED="1486520321580" TEXT="UiManager, Actions etc"/>
<node CREATED="1486521232144" FOLDED="true" HGAP="44" ID="ID_1816242514" MODIFIED="1488423342660" TEXT="Fragen" VSHIFT="16">
<node CREATED="1486521232144" FOLDED="true" HGAP="44" ID="ID_1816242514" MODIFIED="1488677784070" TEXT="Fragen" VSHIFT="16">
<icon BUILTIN="help"/>
<node CREATED="1486521810252" ID="ID_728134375" MODIFIED="1486521858401" TEXT="wer verk&#xf6;rpert den Sesison-Root?">
<icon BUILTIN="help"/>
@ -10476,7 +10504,7 @@
</node>
</node>
</node>
<node CREATED="1434128059966" ID="ID_823283341" MODIFIED="1434128067529" TEXT="Connect">
<node CREATED="1434128059966" ID="ID_823283341" MODIFIED="1488672648352" TEXT="Connect">
<node CREATED="1434128071126" ID="ID_1618124128" MODIFIED="1481413111360" TEXT="UI-Bus">
<linktarget COLOR="#3a8df0" DESTINATION="ID_1618124128" ENDARROW="Default" ENDINCLINATION="-25;-262;" ID="Arrow_ID_539627804" SOURCE="ID_257833497" STARTARROW="Default" STARTINCLINATION="-2;35;"/>
<font NAME="SansSerif" SIZE="14"/>
@ -10648,7 +10676,7 @@
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1485548830035" HGAP="5" ID="ID_1295711115" MODIFIED="1485548844056" TEXT="Nutzen" VSHIFT="17">
<icon BUILTIN="bell"/>
<node CREATED="1485548856639" ID="ID_1677281474" MODIFIED="1485548861522" TEXT="spezifische Aktionen">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1485548894522" FOLDED="true" ID="ID_826011549" MODIFIED="1488423342668" TEXT="Problem: globale Aktionen">
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1485548894522" FOLDED="true" ID="ID_826011549" MODIFIED="1488672334405" TEXT="Problem: globale Aktionen">
<richcontent TYPE="NOTE"><html>
<head>
@ -10673,7 +10701,7 @@
</ul>
</body>
</html></richcontent>
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1485555902731" FOLDED="true" ID="ID_1913236669" MODIFIED="1488423342549" TEXT="#1070 how to bind session commands into UI actions">
<icon BUILTIN="flag-yellow"/>
@ -10927,6 +10955,311 @@
</node>
</node>
</node>
<node CREATED="1488672534372" HGAP="78" ID="ID_1920838120" MODIFIED="1488672850503" TEXT="core commands" VSHIFT="21">
<icon BUILTIN="stop"/>
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<icon BUILTIN="pencil"/>
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<node CREATED="1488672913049" ID="ID_1455665748" MODIFIED="1488672923667" TEXT="brauche InvocationTrail">
<node CREATED="1488675922636" ID="ID_951339978" MODIFIED="1488676038538" TEXT="kann man subsumieren">
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<icon BUILTIN="yes"/>
</node>
<node CREATED="1488675931163" ID="ID_1990262471" MODIFIED="1488675953207" TEXT="InteractionStateManager == Abstraktion">
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</node>
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<icon BUILTIN="messagebox_warning"/>
</node>
<node CREATED="1488676134951" ID="ID_1426727929" MODIFIED="1488676142770" TEXT="N : M">
<node CREATED="1488676119929" ID="ID_70646733" MODIFIED="1488676172343">
<richcontent TYPE="NODE"><html>
<head>
</head>
<body>
<p>
einer k&#246;nnte f&#252;r
</p>
<p>
mehrere Commands zust&#228;ndig sein
</p>
</body>
</html>
</richcontent>
<node CREATED="1488676210948" ID="ID_1003704499" MODIFIED="1488676230046" TEXT="verschiedene Auspr&#xe4;gungen"/>
<node CREATED="1488676230802" ID="ID_1711345566" MODIFIED="1488676234293" TEXT="generische Situation"/>
</node>
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<richcontent TYPE="NODE"><html>
<head>
</head>
<body>
<p>
mehrere k&#246;nnten f&#252;r
</p>
<p>
ein Command zust&#228;ndig sein
</p>
</body>
</html>
</richcontent>
<node CREATED="1488676238120" ID="ID_62079120" MODIFIED="1488676259969" TEXT="da an ein Control/Interface-System gebunden"/>
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<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
....denn wir wollen ja grade
</p>
<p>
den Widget-Code vom Control-System abstrahieren
</p>
<p>
und ebenso die Gesten abstrahieren
</p>
</body>
</html>
</richcontent>
<icon BUILTIN="stop-sign"/>
</node>
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</node>
</node>
</node>
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<head>
</head>
<body>
<p>
<i>mu&#223;</i>&#160;Instanzen einsetzen
</p>
</body>
</html>
</richcontent>
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...und zwar zwingend, sobald
</p>
<ul>
<li>
das command Argument hat, die gebunden sein wollen
</li>
<li>
mehrere Invocations des gleichen Grund-Commands &quot;gleichzeitig&quot; unterwegs sein k&#246;nnten
</li>
</ul>
</body>
</html>
</richcontent>
</node>
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<node CREATED="1488674675895" ID="ID_1414738474" MODIFIED="1488674746218" TEXT="benannt oder anonyom">
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</node>
<node CREATED="1488674682869" ID="ID_1865712804" MODIFIED="1488674755779" TEXT="anonym == ref counted">
<icon BUILTIN="info"/>
</node>
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<node CREATED="1488674807716" ID="ID_1220416942" MODIFIED="1488674814949" TEXT="ist das ein Problem?">
<icon BUILTIN="help"/>
</node>
<node CREATED="1488674815867" ID="ID_417989611" MODIFIED="1488674903230" TEXT="eigentlich nicht">
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<head>
</head>
<body>
<p>
...vom Linken her nicht, da wir Gui gegen Proc linken
</p>
<p>
vom Bauen auch nicht, und au&#223;erdem...
</p>
<p>
...coden wir ja nicht gegen die Implementierung,
</p>
<p>
sondern gegen eine Abstraction (Command), die eigens daf&#252;r geschaffen wurde
</p>
</body>
</html>
</richcontent>
<icon BUILTIN="idea"/>
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<node CREATED="1488675139160" ID="ID_1466153465" MODIFIED="1488675146082" TEXT="unterl&#xe4;uft das Messaging / UI-Bus"/>
</node>
</node>
<node CREATED="1488674721265" ID="ID_1409487095" MODIFIED="1488674735629" TEXT="aber: benannte Instanzen leben einfach weiter">
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<node CREATED="1488677059648" ID="ID_1869818470" MODIFIED="1488677072562" TEXT="war eigentlich nur f&#xfc;r &quot;Spezialisierungen&quot; gedacht"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1488675785223" ID="ID_134788782" MODIFIED="1488675850639" TEXT="Aufgaben">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1488675788278" ID="ID_241828684" MODIFIED="1488675873111" TEXT="wer erzeugt die Instanz?">
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<node CREATED="1488676735628" ID="ID_845338567" MODIFIED="1488676745534" TEXT="der InteractionStateManager">
<icon BUILTIN="help"/>
</node>
<node CREATED="1488676746667" ID="ID_1675443482" MODIFIED="1488676751306" TEXT="jemand in Proc">
<icon BUILTIN="help"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1488675795485" ID="ID_560742641" MODIFIED="1488675865907" TEXT="wer benennt die Instanz?">
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<node CREATED="1488676790165" ID="ID_450420022" MODIFIED="1488676795858" TEXT="der der sie erzeugt">
<icon BUILTIN="help"/>
</node>
<node CREATED="1488676796892" ID="ID_399980219" MODIFIED="1488676813292" TEXT="ein Benennungs-Service in Proc">
<icon BUILTIN="help"/>
</node>
<node CREATED="1488676805491" ID="ID_1995019439" MODIFIED="1488676815444" TEXT="ein Instanz-Pool">
<icon BUILTIN="help"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1488675800668" ID="ID_260870361" MODIFIED="1488675862145" TEXT="wer h&#xe4;lt die Instanz (am Leben)?">
<icon BUILTIN="help"/>
<node CREATED="1488676827432" ID="ID_1354771185" MODIFIED="1488676881245" TEXT="Problem: air-Gap">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...wegen
</p>
<ul>
<li>
Command-Message via UI-Bus
</li>
<li>
Durchreichen durch das Interface-System
</li>
</ul>
</body>
</html>
</richcontent>
<icon BUILTIN="messagebox_warning"/>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1488677586744" ID="ID_1077384395" MODIFIED="1488677612409" TEXT="AUA: Zwang zum Benennen">
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</node>
</node>
<node CREATED="1488676941240" ID="ID_403164604" MODIFIED="1488676965416" TEXT="im Proc-Dispatcher kein Problem">
<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...da die DispatcherQueue direkt Command-Objekte (=frontend handle) speichert
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<node CREATED="1488677212907" ID="ID_1525612446" MODIFIED="1488677229204" TEXT="Idee: im InteractionStateManager">
<node CREATED="1488677232640" ID="ID_1033002023" MODIFIED="1488677274454" TEXT="null oder maximal eine pro Command"/>
<node CREATED="1488677258932" ID="ID_1695115228" MODIFIED="1488677268487" TEXT="andere Geste -&gt; andere Command-Instanz"/>
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<node CREATED="1488677346473" ID="ID_712110821" MODIFIED="1488677350100" TEXT="air-Gap"/>
<node CREATED="1488677350640" ID="ID_901346570" MODIFIED="1488677370377" TEXT="Ausf&#xfc;hrung im Dispatcher erst sp&#xe4;ter"/>
<node COLOR="#338800" CREATED="1488677418087" ID="ID_644949863" MODIFIED="1488677499488" TEXT="ist doch kein Problem">
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</head>
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<p>
...denn das GUI l&#228;uft ja synchron.
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<p>
D.h. wir wissen, wenn wir das Air-Gap &#252;berstanden haben.
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<p>
Ab diesem Punkt h&#228;lt der Eintrag in der DispatcherQueue das Command am Leben,
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<p>
und wenn es stirbt, dann stirbt es halt...
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<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1488677859619" ID="ID_827179653" MODIFIED="1488678049693" TEXT="Problem: Service-Zugang">
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</head>
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<p>
...da dies ein pervasiv genutzter Service ist,
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<p>
und wir nicht wollen, da&#223; jedes Widget
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<p>
mit dem InteractionDirector verdrahtet sein mu&#223;!
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