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UI-Lifecycle: build trigger point for content population into InteractionDirector (closes #1151)

Browse source 
In the end, I decided against building a generic service here,
since it pretty much looks like a one-time problem.

Preferrably UI content will be pushed or pulled on demand,
rather than actively coding content from within the UI-Layer
This commit is contained in:
Fischlurch 2018-08-04 16:02:00 +02:00
parent 4306e47930
commit eca06a8309
5 changed files with 137 additions and 31 deletions
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4
doc/technical/code/gtk/startup.txt
View file

@ -115,6 +115,10 @@ signal is emitted _shortly before_ entering the event loop, and not from within
A better alternative is to rely on the `Glib::signal_idle()` rsp. `Glib::signal_timeout()`. Both allow
to invoke a slot only once, and both ensure the invocation really happens from within the event loop.
footnote:[Verified as of 8/2018: uses `g_main_context_default()`, which creates the default context
on demand. This is also the default context _pulled_ when running the event loop. So indeed we're
able to attach an ``event source'' (i.e. an action or closure) even before the loop is running.
Use `Glib::PRIORITY_LOW` to schedule after any (re)drawing activities.]
SigC++ trackable
~~~~~~~~~~~~~~~~

15
src/gui/interact/interaction-director.cpp
View file

@ -86,8 +86,7 @@ namespace interact {
* @param globals wiring to the circle of top-level UI managers (including ourselves)
* @warning this ctor is performed within the UI thread, yet _prior_ to entering the GTK event loop.
* For this reason, all initialisation performed here must be wiring-only; any tasks requiring an
* actually operative UI need to be scheduled, by means of the NotificationService.
* @todo 7/2018 STOP no, can't be the NotificationService. ////////////////////////////////////////////TICKET #1151 : Need a new dedicated service in UiManager
* actually operative UI will be _scheduled,_ to run later when the UI is fully operative.
*/
InteractionDirector::InteractionDirector (GlobalCtx& globals)
: model::Controller(session::Root::getID(), globals.uiBus_.getAccessPoint())
@ -100,7 +99,17 @@ namespace interact {
, assets_{new AssetController{session::Root::getAssetID(), this->uiBus_}}
, timelines_{}
{
Glib::signal_timeout()
.connect_once (sigc::mem_fun(*this, &InteractionDirector::populateContent_afterStart)
,DELAY_AFTER_GUI_START_in_ms
,Glib::PRIORITY_LOW); // after all initial drawing tasks
}
void
InteractionDirector::populateContent_afterStart()
{
UNIMPLEMENTED ("issue content population request as command into the session");
}

8
src/gui/interact/interaction-director.hpp
View file

@ -121,12 +121,18 @@ namespace interact {
Assets assets_;
Timelines timelines_;
/** set up a binding to allow some top-level UI state
* to be treated as part of the session model
* @see tree-mutator.hpp
* @see tree-mutator.hpp
*/
void buildMutator (lib::diff::TreeMutator::Handle) override;
/** ask Session to push up structures for presentation */
void populateContent_afterStart();
static constexpr auto DELAY_AFTER_GUI_START_in_ms = 100;
public:
InteractionDirector (ctrl::GlobalCtx&);
~InteractionDirector ();

3
wiki/renderengine.html
View file

@ -3058,7 +3058,7 @@ The consequence is that both sides, "the core" and "the UI"
Rather, the core sends ''diff messages'' up to the UI, indicating how it sees this virtual structure to be changing. The UI reflects these changes into //its own understanding and representation,// that is here a structure of display widgets. When the user interacts with these structures of the presentation layer, ''command messages'' are generated, using the element ~IDs to designate the arguments of the intended operation. This again causes reaction and change in the core, which is reflected back in the form of further diff messages. (→ GuiCommandCycle)
</pre>
</div>
<div title="GuiContentPopulation" creator="Ichthyostega" modifier="Ichthyostega" created="201807121909" modified="201808031636" tags="GuiIntegration spec draft" changecount="9">
<div title="GuiContentPopulation" creator="Ichthyostega" modifier="Ichthyostega" created="201807121909" modified="201808041325" tags="GuiIntegration spec draft" changecount="10">
<pre>//install a listener into the session to cause sending of population diff messages.//
The Lumiera application is not structured as an UI with internal functionality dangling below. Rather, the architecture calls for several self-contained subsystems, where all of the actual &quot;application content&quot; is modelled within the [[Session]] subsystem. The UI implements the //mechanics of user interaction// -- yet as far as content is concerned, it plays a passive role. Within the UI-Layer, there is a hierarchy of presentation entities, to mirror the structure of the session contents. These entities are built step by step, in reception of //population diff messages// sent upwards from the session.
@ -3071,6 +3071,7 @@ And since we are talking about a generic facility, the framework of content popu
The general plan to trigger content population thus boils down to
* have the InteractionDirector inject the population trigger with the help of {{{Glib::signal_timeout()}}}
* which will activate with a slight delay (100ms) after UI start, and after primary drawing activities ceases
* the trigger itself issues a command towards the session
* execution of aforementioned command activates sending of population / diff messages
* on shutdown of the top-level, send the corresponding deactivation command </pre>

138
wiki/thinkPad.ichthyo.mm
View file

@ -2,8 +2,8 @@
<!-- To view this file, download free mind mapping software FreeMind from http://freemind.sourceforge.net -->
<node BACKGROUND_COLOR="#6666ff" CREATED="1434127882200" ID="ID_1452170048" MODIFIED="1518487921106" STYLE="fork" TEXT="Lumi">
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<node CREATED="1455289597596" ID="ID_970065036" MODIFIED="1518487921038" TEXT="work site"/>
<node CREATED="1455289466261" ID="ID_273679080" MODIFIED="1518487921038" TEXT="PresentationState"/>
@ -13466,8 +13466,8 @@
<icon BUILTIN="button_ok"/>
</node>
<node CREATED="1489777837120" ID="ID_466927949" MODIFIED="1518487921075" TEXT="Ort f&#xfc;r Command-Definitionen"/>
<node COLOR="#338800" CREATED="1489777846095" ID="ID_1401258681" MODIFIED="1518487921075" TEXT="Design Proc-Command-Framework vorantreiben">
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<node COLOR="#338800" CREATED="1489777846095" ID="ID_1401258681" MODIFIED="1533385633816" TEXT="Design Proc-Command-Framework vorantreiben">
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<font NAME="SansSerif" SIZE="14"/>
<icon BUILTIN="button_ok"/>
</node>
@ -15887,8 +15887,8 @@
<node CREATED="1531423650339" ID="ID_583637266" MODIFIED="1531423655294" TEXT="Lebenszyklus kl&#xe4;ren"/>
<node CREATED="1531423734880" ID="ID_1658395629" MODIFIED="1531423739643" TEXT="Verbindungen kl&#xe4;ren"/>
</node>
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<node COLOR="#338800" CREATED="1532788529509" ID="ID_390131579" MODIFIED="1533388695623" TEXT="Trigger-Punkt">
<icon BUILTIN="button_ok"/>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1532788547560" ID="ID_1581791639" MODIFIED="1532788625456" TEXT="mu&#xdf; in der GTK-Event-Loop liegen">
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<font ITALIC="true" NAME="SansSerif" SIZE="12"/>
@ -16313,13 +16313,13 @@
<node CREATED="1533310430167" ID="ID_1809941457" MODIFIED="1533310441873" TEXT="setzt eine GApplication (=Gio::Application) voraus"/>
<node CREATED="1533310442557" ID="ID_1182449800" MODIFIED="1533310447656" TEXT="und das wollen wir nicht"/>
</node>
<node BACKGROUND_COLOR="#ccb59b" COLOR="#6e2a38" CREATED="1533310502420" ID="ID_1045876919" MODIFIED="1533310506297" TEXT="selber bauen">
<node BACKGROUND_COLOR="#ccb59b" COLOR="#6e2a38" CREATED="1533310502420" ID="ID_1045876919" MODIFIED="1533388596803" TEXT="Glib::SignalTimeout nutzen">
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<icon BUILTIN="yes"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1532788656585" ID="ID_99363690" MODIFIED="1533223405882" TEXT="geeignet ansiedeln">
<icon BUILTIN="pencil"/>
<node COLOR="#338800" CREATED="1532788656585" ID="ID_99363690" MODIFIED="1533388668090" TEXT="geeignet ansiedeln">
<icon BUILTIN="button_ok"/>
<node CREATED="1532794614249" ID="ID_884179844" MODIFIED="1532794617028" TEXT="Plan">
<node CREATED="1532794617968" ID="ID_1917693631" MODIFIED="1533310766197" TEXT="geeigneten Zugang vom Ctor-Code">
<icon BUILTIN="full-1"/>
@ -16331,8 +16331,8 @@
<icon BUILTIN="full-3"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1533221103349" ID="ID_1053145038" MODIFIED="1533223398404" TEXT="Anker">
<icon BUILTIN="pencil"/>
<node COLOR="#338800" CREATED="1533221103349" ID="ID_1053145038" MODIFIED="1533388653067" TEXT="Anker">
<icon BUILTIN="button_ok"/>
<node BACKGROUND_COLOR="#ccb59b" COLOR="#6e2a38" CREATED="1533221107205" ID="ID_1202141905" MODIFIED="1533221141349" TEXT="es mu&#xdf; der InteractionDirector sein">
<font ITALIC="true" NAME="SansSerif" SIZE="14"/>
<icon BUILTIN="yes"/>
@ -16392,9 +16392,7 @@
</node>
</node>
</node>
<node BACKGROUND_COLOR="#fdfdcf" COLOR="#ff0000" CREATED="1533221742343" ID="ID_1970220536" MODIFIED="1533310682384" TEXT="Alternative schaffen">
<icon BUILTIN="flag-pink"/>
<node CREATED="1533223360183" ID="ID_1309454354" MODIFIED="1533252142536" TEXT="Idee">
<node CREATED="1533223360183" FOLDED="true" ID="ID_1309454354" MODIFIED="1533388625069" TEXT="Idee">
<icon BUILTIN="button_cancel"/>
<node CREATED="1533223371534" ID="ID_891597430" MODIFIED="1533310719489" TEXT="UiDispatcher">
<icon BUILTIN="stop-sign"/>
@ -16409,10 +16407,10 @@
<node CREATED="1533252172584" ID="ID_230437417" MODIFIED="1533252187890" TEXT="setzt zwingend voraus, da&#xdf; die Event-Loop schon l&#xe4;uft"/>
</node>
</node>
<node BACKGROUND_COLOR="#eee5c3" COLOR="#990000" CREATED="1533221770859" ID="ID_1962039642" MODIFIED="1533314199241" TEXT="daf&#xfc;r einen dedizierten Service einbauen">
<icon BUILTIN="flag-yellow"/>
<node BACKGROUND_COLOR="#ccb59b" COLOR="#6e2a38" CREATED="1533310637466" ID="ID_1772394299" MODIFIED="1533310663064" TEXT="wo?">
<font ITALIC="true" NAME="SansSerif" SIZE="14"/>
<node CREATED="1533221770859" FOLDED="true" ID="ID_1962039642" MODIFIED="1533387993628" TEXT="daf&#xfc;r einen dedizierten Service einbauen">
<icon BUILTIN="button_cancel"/>
<node CREATED="1533310637466" ID="ID_1772394299" MODIFIED="1533385333187" TEXT="wo?">
<font NAME="SansSerif" SIZE="12"/>
<icon BUILTIN="yes"/>
<node CREATED="1533221796823" ID="ID_179436166" MODIFIED="1533310650010" TEXT="im UiManager">
<icon BUILTIN="idea"/>
@ -16422,7 +16420,8 @@
</node>
<node CREATED="1533311253662" ID="ID_704687465" MODIFIED="1533311258358" TEXT="was?">
<icon BUILTIN="help"/>
<node CREATED="1533311314709" ID="ID_277761751" MODIFIED="1533311321160" TEXT="wirklich in der Loop?">
<node CREATED="1533311314709" ID="ID_277761751" MODIFIED="1533385647446" TEXT="wirklich in der Loop?">
<linktarget COLOR="#a9b4c1" DESTINATION="ID_277761751" ENDARROW="Default" ENDINCLINATION="-48;213;" ID="Arrow_ID_1127398125" SOURCE="ID_748660217" STARTARROW="None" STARTINCLINATION="256;0;"/>
<node CREATED="1533311322220" ID="ID_1614182663" MODIFIED="1533311415466" TEXT="Fenster-aktivieren passiert vor der Loop">
<richcontent TYPE="NOTE"><html>
<head>
@ -16442,8 +16441,7 @@
Fenster gibt es gar keine Benutzer-Events.
</p>
</body>
</html>
</richcontent>
</html></richcontent>
</node>
<node CREATED="1533311415455" ID="ID_1211339520" MODIFIED="1533311614570" TEXT="GTK-Aktivierungs-Mechanismus hat andere Gr&#xfc;nde">
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@ -16458,8 +16456,7 @@
aber <i>wir</i>&#160;brauchen ein <b>laufendes</b>&#160;UI
</p>
</body>
</html>
</richcontent>
</html></richcontent>
<node CREATED="1533311682171" ID="ID_1084601430" MODIFIED="1533311693093" TEXT="und zwar f&#xfc;r die Antworten aus Proc-Layer"/>
<node CREATED="1533311693705" ID="ID_152811842" MODIFIED="1533311698877" TEXT="Facade mu&#xdf; offen sein"/>
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@ -16484,7 +16481,8 @@
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<icon BUILTIN="idea"/>
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<icon BUILTIN="forward"/>
<node COLOR="#338800" CREATED="1533314031621" ID="ID_1030647718" MODIFIED="1533314158876" TEXT="das ist wohl die beste L&#xf6;sung">
<icon BUILTIN="button_ok"/>
@ -16496,7 +16494,60 @@
</node>
</node>
</node>
<node COLOR="#338800" CREATED="1533385296078" ID="ID_911350305" MODIFIED="1533388643836" TEXT="einfache direkt L&#xf6;sung">
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<node CREATED="1533385581435" ID="ID_613721842" MODIFIED="1533385589533" TEXT="ich glaube, das bleibt ein Einzelfall"/>
<node CREATED="1533385595528" ID="ID_748660217" MODIFIED="1533385647446" TEXT="es mu&#xdf; wirklich in der Event-Loop laufen">
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<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...dann kann sich das Sytem erst mal <i>beruhigen</i>
</p>
<p>
nach der Lastspitze zum Programmstart, f&#252;r den viel Code geladen werden mu&#223;te.
</p>
<p>
Au&#223;erdem hatten dann die anderen Subsysteme schon Zeit, ihre Grunddatenstrukturen aufzubauen;
</p>
<p>
im Besonderen spekulieren wir darauf, da&#223; die Session-Daten bereits geladen sind,
</p>
<p>
und daher der Diff direkt und kompakt in einem Durchgang emittiert werden kann
</p>
</body>
</html></richcontent>
</node>
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<icon BUILTIN="ksmiletris"/>
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@ -25498,8 +25549,8 @@
</node>
</node>
</node>
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@ -32302,6 +32353,41 @@
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<node CREATED="1533388065237" ID="ID_1853196275" MODIFIED="1533388071944" TEXT="es gibt einen default_main_context"/>
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<richcontent TYPE="NOTE"><html>
<head>
</head>
<body>
<p>
...und erzeugt diesen on demand auch neu
</p>
</body>
</html>
</richcontent>
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</node>
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