MDriven Designer Overview part 3
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<h5> Review on the WECPOF prototyper application and continue on prototyping with actions and viewmodels.</h5>
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     <span class="navigation-item" data-video="it0ZD7gtjnE" data-start="41" tabindex="0"> Running prototyper application</span>
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[[Category:WECPOF]]
'''Raw video subtitles'''
[[Category:View Model]]
 
[[Category:Actions]]
I welcome back this is part three of
[[Category:MDriven Designer]]
 
[[Category:MDriven Designer Sessions]]
the MDriven overview
{{Edited|July|12|2024}}
 
let's have the right back in them on the
 
day the play button where we have their
 
system prototyper we have looked at the
 
the new debugger that look like this but
 
this button wrong model and continue
 
modeling is also interesting if we push that one we get there
 
this window and that actually is
 
possibly our running application and
 
this also has a model refresh, so if we
 
do changes in our model this one can
 
re-read to to reflect the changes to
 
actually execute an application we need some kind of menu
 
this is just the administrative manual
 
way you can issues sties and refreshed
 
models but how do we get there and a
 
menu in here so that we could view our
 
and view model or rendered view of our view model actually
 
we do that by adding an action in the
 
action dialogue so actions editor click that one up
 
it looks like this and and that we could
 
create a new global action global
 
actions are actions that show up in the
 
global menu in her in a prototype
 
application so I'm going to add a new
 
global action when I select that in the grid
 
I get the properties here to change if I need to
 
so if this is just "Default" name new global action
 
it has the ability to have an enable
 
expression and again it's the ocl it has
 
the ability to have access groups we're
 
going to look at that later on and
 
there's also a possible execute
 
expression again it's ocl but the action
 
language remember ocl with side effects
 
that actually can change data but we are
 
going to use now is bring up a few more
 
the house view the one that with it so
 
let's leave it at that first and we head
 
back to this window and we re-read the model
 
for some reason it big again and now we
 
have the new global action as a menu and
 
this is as we see it here it's rendered
 
with spaces between each camel case part
 
of the world word new global action one
 
but what we named it too was just a
 
camel case new global action 1
 
why is that that is because we left the
 
presentation as the "Default" and and when
 
it's the presentation is left like this
 
just stating that we should use the name
 
we run this their algorithm to hack up
 
the name on each capital case so now
 
this action what it should do is bring
 
up the house view so let's see if it
 
does that and it does so we see a couple
 
of interesting things here and this side
 
is the view and this side is saved for
 
any actions that are valid in this view
 
they will be listed here what we notice
 
immediately is that they create street
 
button got really launched and that is
 
because it's at the end of the at the
 
bottom of the view mom and anything that
 
and is at the end of the view model
 
and rendered by this rendering engine
 
which uses wpf windows presentation
 
foundation will be extended to the
 
bottom so that's actually a feature to
 
enable us to have you I that fills out
 
the view and scales with the view we were to drive like this
 
so in order to mitigate this we should
 
make sure that this isn't touching the
 
end there's couple of ways of doing that
 
but I'm going to choose to say that
 
there's a explicit row count in this
 
view model if I turn on the grid lines I
 
can see that it has one two three four
 
five rows that he Ritt States 00 just
 
means that it will adapt to the highest
 
needed position from the things that we
 
have placed here so if we look at our
 
action that is rendered as the button
 
it's actually set its place on road 400
 
1234 and that's great if we were to move
 
this to hear it would say row five and
 
then this one expanse but what we want
 
to do is to avoid having this at the
 
body so let's say there's seven rows in
 
the grid now there's an empty row in
 
between can move that up again there's
 
two empty rows and that would be
 
rendered as if we will work to refresh the model
 
like that so that's more like what we
 
want to see so now what we'll notice
 
here is that and this won't take any
 
edits as of yet everything disappears
 
even if we do the create street nothing
 
sticks and this was expected because if
 
we look at that our view model it's
 
rooted in a house but if we look at the
 
action the view model root object is
 
not set so what we see here is an empty
 
shell it isn't back by the house to
 
mitigate this we can either create the
 
house as part of the action
 
so in the human root object we would do
 
house create and if we then
 
if we then we read the model first asked
 
me since I have changes and the changes
 
are actually created a street that I try
 
to tie to an empty house or to the new
 
house would you like to save it now and every time
 
let's see every time I push the model
 
refresh this view goes really big
 
why is that let's fix that once and for
 
all it's actually this one screen size
 
that we have set to something quite
 
large if we were to change it to let's
 
say 800 x 600 and do the model refresh
 
then it sticks this way, ok but what we were working at at state
 
new global action is actually backed by
 
house, so now when I click and the street
 
number should stake they create street
 
should state but not about is also that
 
the Save button is lit up and the cancel button
 
so if I were to save this and do a new
 
global action I actually create a house
 
by clicking this action
 
ok and normally you wouldn't like the
 
action to be placed like this this is
 
more like you expect the submenu from it
 
to create the the submenus we could
 
assign the global action to the menu
 
group menu group we don't have any as of
 
yet so we could create some pick up this
 
dialog and add a menu group let's call this one and five
 
that's add another one called views and
 
we want to sort these so that five let's
 
add not want and hey we want to have
 
this one first and this one second and
 
this one third so now we have some
 
groups that are global to our model and
 
we can assign our action to a group
 
going to assign it to the views group
 
and if I now reload their model I got
 
the views with the new global action
 
under it so that's better but I didn't
 
get the file or the edit menus because
 
those are just groups without any actions in
 
there's actually a button here create
 
and int standard actions let's see what it does
 
so it says you already have some actions
 
defined you still want to create standard actions
 
yes, he added some actions
 
maybe it also added some groups
 
yes it's added one group but that's fine
 
so let's look at what the actions were
 
that it added the same action
 
that's not back by anything but a
 
framework action framework actions are
 
safe refresh undo/redo exit business
 
delete and do model ok so those are the
 
choices for the framework work actions
 
same is actually just saving the state
 
of the view the Refresh will in an
 
environment where we work against at
 
persistence server like the am driven
 
server or turnkey application refresh
 
will re-read data that has changed in the
 
database since we read it to the view
 
exit will try and exit the application
 
undo and redo obvious they will try to
 
undo the latest changes that the usage
 
has done or redo them and then we have
 
our new global action that we started
 
so refreshing the the prototype will
 
give us five exit refresh safe and add
 
it will have redo an undue and the views
 
will have the new global action and the
 
Stice allow us to optionally and set
 
another wpf style
 
ok so new global action and we could
 
create street and set something here now
 
we could go edit undo or added reading
 
or we could go safe like this right
 
and normally redo an undue is backed by
 
control set and control y so if we would
 
want to do something like that we could
 
say that down here menu group the on
 
this is the undo
 
it's in the menu group edit and shortcut
 
key set and control and the redo should
 
have a shortcut key like and control
 
let's see that that stuff yeah and then
 
if we were to re-read the model we see
 
that they have been back by these
 
shortcut keys so view new global action
 
undo that wasn't what I was supposed to
 
show I should press ctrl + set like that
 
alright if I now save the changes that
 
we have so far I will notice there's an
 
error showing up and what it says is
 
there's a new global action that sets a
 
root object for the house view but the
 
house view doesn't require the root
 
object so why do we set one this is just
 
a helper to make our design consistent
 
so to address this warning we should
 
open up the house
 
view and say that it requires root topic
 
because this view is no good without a
 
packing house so if we were to shake
 
this one it quick
 
it requires a root object and save again
 
that triggers the error finding in the
 
model we could have pushed that one as
 
well of course and we see that there
 
the warning is gone
 
ok so
 
our model looks kind of weird
 
we're going clean it up a bit and and
 
remember if I'm just press delete and
 
not control the elite I only remove
 
things from view press Delete deep I
 
only remove these from from this diagram
 
and this one is not squared line and I
 
would like it to be squared so I press
 
the shortcut key for that control our
 
this and this one as well that and class
 
2 doesn't really help us anything
 
let's say that this is a person with a
 
first-name lost like that and the
 
association class between person and
 
house could be yeah lease contract that
 
we have a lease on and department in the
 
house maybe so that would state a hard
 
then number as an integer that's
 
possibly inaudible and maybe it should
 
state the rent
 
is that double now I just press ctrl
 
while using the thumb thumb wheel on the
 
mouse to scroll in scroll up with scroll
 
where my mouse is pointing so if I pump
 
. here and scroll it will stay in you
 
strong out I want to look closer to this
 
one pointed and control and mouse wheel
 
in a root so on the lease contract it
 
will be important to also give some
 
dates so gonna add a start and this is
 
actually featured at them when we parts
 
the the data that you put in to this
 
edit we start from left to right so in
 
order to be quick so if you just start
 
to write start date and then continue
 
with colon day time ? and that's what
 
you will get a little bit faster
 
and they question like that so that
 
might be a good lease contract
 
so we should probably em call this one
 
and this is Bella way I don't know going
 
to pounce and group should be one that
 
and I would call this and apart man so
 
the person can have multiple rented
 
apartments multiple each one is backed
 
by a lease contract and the house can
 
have multiple tenants that are persons
 
and that makes sense to me and now when
 
I'm doing this model but of course
 
depending on the requirements each maybe
 
we'll look totally different when
 
meeting an actual domain doing actual
 
work so that's the the point of modeling
 
finding the requirements that are right
 
for a particular use case so what about
 
this link what you mean maybe if we
 
change this one to owned houses and we
 
would change this one to both
 
so now the rules say that house only has
 
one owner owned by but a person can own
 
many houses
 
ok so now we have just cleaned up a
 
little bit gonna move in this tree
 
closer that didn't turn out very well
 
that and the location so what about the
 
location maybe to motivate the
 
generalization of location maybe we just
 
should add a city like that and a name
 
of the city that also is back but that
 
has a position property and then it
 
would be appropriate to have that street
 
is in 101 city and the city has multiple
 
sweet that would make sense
 
say we haven't done any thing to
 
actually change the views so adding back
 
to their prototype which we often
 
referred to as like path and why is it
 
called wake up off
 
well when we started m/m driven
 
framework was named eco enterprise core
 
objects ec ok and then when we found
 
that it was a good match to render
 
things in wpf we sort of much and the ID
 
to enterprise core objects and the wpf so
 
that's the story behind the crazy name
 
that and bothers some but hey it's just
 
a name it's not important but when you
 
hear us refer to the engine back of we
 
often talk about the the idea to take
 
purely decorative design with the view
 
models to running application and
 
actually the idea to do this is
 
implemented in many more ways than just
 
the wpf windows presentation foundation
 
it's implemented in like in turn key
 
with the angularjs and MVC for the web
 
and and actually we have it all over the
 
place it's also in in windows for us and
 
I speed of that so the idea is larger
 
than windows presentation foundation
 
let's add a slightly more day and
 
another view model to give us an access point to the houses
 
let's call this one "AllHouses"  to start
 
with and we say that it's in the type
 
context of house but now we can add the
 
column or then the nested viewmodel
 
column multiple links get a problem with
 
this showing outside of the screen house
 
all instances, let's see what happens if
 
we just follow the model so that and
 
this pops out because we said it was of
 
glass house so then and there
 
view model editor suggest that maybe you
 
want to use house or instances in all
 
instances is an OCL operator to show
 
everything of that particular class so
 
that's a practical way to start on in
 
information sets that there are small
 
and initially everything is small so
 
it's a good start, so what happened here
 
it added the this view model call you
 
with the ocl expression house all
 
instances and if we were to look at the
 
resulting type of days it's a collection
 
of house so it's basically houses and
 
then it added this blue nesting
 
viewmodel claws and it connected this
 
column to this one so how come the sound
 
connected it should look like this as
 
was a new one I  haven't seen that before
 
so the house all instances points out
 
associated to all house so these are all
 
made up names that let's call this one
 
house grit and whenever they're in the
 
view rendering engine seized this type
 
of construction there's something that
 
is creating a list and you have
 
properties on each object for in the
 
list it will suggest that we should
 
render it as a great and to make they're
 
going to switch off the grid lines the
 
grid lines are for the complete the area
 
that we rendering and this is a rented
 
great if we switched the designer style
 
of the render that they take might be
 
more clear what happens all that in work as expected
 
let's see if I switch, yeah like this I had to switch back and
 
forth to make it stick, so this is and rendered as a grid and if
 
I add properties I can either just add a
 
eunuch volume and then I will have to
 
write my expression ocl expression what
 
should be in it myself where I can just
 
pick from what the view model editor
 
suggest based on the based on the type
 
information so let's pick the street
 
number and now did the street number and
 
up here and it ends up as a column in
 
the grid so if I continue like this at
 
the state than the state ends up here
 
and I'm gonna add a unary call you that
 
I can name to something but first we're
 
going to do the expression so what it wouldn't do
 
maybe we want to list who owns it so
 
as we are in context of house we have
 
access to the roles of the associations
 
of house house has an association owned
 
by as we see here so let's follow that
 
one and then we are in context of the
 
resulting type is person and person has
 
a first name and lost me
 
ok so let's take the the last name of that wasn't
 
let's take the the last name like that
 
so self owned by and last name and this
 
is really easy to navigate through
 
associations like this we can navigate
 
as far as we want and need in ocl so
 
that is really great when designing a
 
fully normalized information model where
 
everything is stored only once and
 
reused whenever needed so that forces us
 
to collect things together to present
 
the needed information in one context or
 
as we would like to call it in one view
 
model so now when I have the last name
 
of the owner I can name the call you last name of home
 
so this is another view and I would like
 
to have a global action for bringing up
 
this view this view actually isn't
 
backed by doesn't need to be backed by a
 
specific house because it doesn't make
 
use of anything of the root
 
the root object it just use the class and use the
 
class operator all instances if I right
 
click this one I get an option to add a
 
"Global Action for Create" or a global action for show
 
so this is just a shortcut to let's see
 
what happens if I do it is and in the
 
action dialogue and you action was
 
created "show.allhouses" so that was what
 
that helper method did show all
 
houses it brings up the viewmodel all
 
houses but what it didn't do is sorted
 
into a menu group so I will add that myself
 
it should be in the views like that so
 
that would mean that if I had back here
 
and refresh the model I should have
 
another one called "show.allhouses" that
 
shows a grip where all the houses that I
 
have created before are available all right
 
so now something interesting happens
 
what we really wanted to do with showing
 
a single house that we have in our other viewmodel this one
 
ideally we would just like to point and
 
one here and have this one backing this
 
one so maybe this one shouldn't be
 
brought up by a global action at all is
 
that it should be brought up by and
 
either an action of of this object or an action of this view
 
alright so we have two options we could
 
either do a viewmodel action that is
 
endemic to a specific view let's try
 
that first in the old houses that we can
 
push this button actions action
 
definitions with which just applies a
 
filter to the actions definitions that
 
is this show you model actions only
 
not the global actions and not the class
 
actions and filter on this human all
 
houses so the only thing this did was to
 
fill three days that initially looked
 
like this shows all actions and
 
incidentally we can push this one to
 
show all actions but from here action definitions for this view
 
are these show all actions but we want to do itfor this view
 
alright so we want to do a new view
 
model action that's an action
 
that only exists in a certain view so when I
 
create one, I get a new view model action
 
that only in viewmodel all houses and
 
within all houses I only wanted to show
 
in-house grid and when it's executed
 
I wanted to bring up the house view and
 
the view model root object for the house view
 
should be, yeah, what should it be
 
let's bring up the ocl editor it should
 
be the current object of the house grid
 
that would make sense, we're going
 
to get back to the vCurrent and vSelected soon
 
so now we have created a new action
 
that's only visible in the "AllHouses"
 
view model and only four objects of the
 
house grid and will bring up the
 
viewmodel house view and setting the root of the house
 
view to the current row of the house
 
grid let's see how that plays out in
 
the prototyper refreshing the model, views
 
"show.allhouses", so when I select one here
 
this one should bring up just the
 
one on pointing it so this is did one with
 
let's go back and now I see that the street number 444, that's the
 
street number 444, back so if I were to
 
bring this one up like that and set the
 
street number 123 save that, hit back and
 
then I see it's 123 so this is a way
 
to tie view models or views roller
 
together so this is a really bad name
 
for this action let's name it "ShowHouse"
 
model refresh, views, "show.allhouses", show house
 
just a few short notes on how
 
the back of engine works if we were to
 
down "ctrl" and while we press the action show house it would actually
 
add another tab to show the date so this way we could bring up another one like that
 
and notice this green "." it's actually
 
the it signals that there's a object root connected to this view
 
so this one doesn't have a green dot
 
because that doesn't have a rooted house
 
to start with but these stood
 
and also double-click on a row in the
 
grip will check the actions list for
 
actions that navigates like this one it
 
will take the first navigating enabled
 
action and executed so if I were to
 
double click on this one while holding
 
"ctrl" it would bring that one up and I don't need to use the action that's a
 
practical way to navigate and
 
double-clicking without holding control
 
of course will replace the content in
 
this view like this but the back will
 
bring me once that back just like in a
 
web browser so I'm back to the old
 
houses like that so these are some of
 
the functionalities of the UI engine that we use here
 
also notice that the text on the tabs
 
here are actually the "asstring"
 
representation of the rooted object and do
 
you remember from part one where we got
 
that from in the house we had set the
 
"Default" string representation as
 
an OCL expression to the street name and
 
this stree has street number "asstring" and
 
just to prove a point we could add
 
something else here "ForReal" like that
 
and heading back to here and refreshing the model and showing "AllHouses"
 
we have the "ForReal" representation here and if we
 
were to double click one you have the
 
"ForReal" representation there okay
 
as I said with the action that we added
 
we had two options either do in action
 
that's also the actions are visible here
 
and you use this one to fold it or to show it
 
we could either have done an action and
 
endemic to this view as within the
 
viewmodel action and if we will
 
double-click this we would get that
 
selected and see that it is a viewmodel
 
action, action type navigates from "AllHouses"  to house view
 
and if we were to click this it will
 
actually show us the view model that it
 
navigates tool and that's the house you
 
and then we could click there to jump
 
back to the ones that we have looked at
 
before and this I can actually to
 
opt it out not to show it in this scenario
 
and opted out are available here and we
 
can opt back in up here we see all the
 
actions that leads to a certain view so
 
actions leading here or from the main
 
menu views of you group views and show
 
all house and if I were to jump to the house viewmodel
 
I can see there are two actions leaving here either one of views new global action
 
that we did as a starter action or the viewmodel action
 
in "AllHouses"  called show house and I
 
can navigate to these two by clicking them
 
actually we might as well drop
 
this global action from the main menu
 
that created "House" it's not really
 
the correct way to do it
 
delete action, which leaves us in an
 
interesting situation we have no way to
 
create new house currently and we
 
will need to add that to the
 
maybe to the "AllHouses"  view so in here
 
we might as well add a new view model action
 
with a different purpose
 
add new house and instead of having
 
navigate that it should do if we
 
have set to bring up the view model we
 
might as well give it and execute
 
expression instead, execute expression
 
and what we wanted to do is just house.create
 
and that would be enough
 
so not saying only in this will give us this look
 
"AddNewHouse" is available on the
 
allhouses under this one the root but
 
also in the house grip at new house so
 
that's not very and intuitive for the
 
user to see the "AddNewHouse"  in two
 
places, so we could either opt one of them
 
out, or we might as well instruct the action that it should only
 
show in the "AllHouses" on the root that
 
said if you think about it it's the only
 
place where it makes sense - on the root
 
because, if you have no houses, we still
 
want to be able to create a house
 
so even if the grid is empty, so only in this "AllHouses"
 
made it disappear from the HouseGrid
 
heading back to the "Prototyper"
 
refreshing the model views show all
 
houses, I now have a new action "add new house"
 
and as you see house.create was
 
all it took to create new house and
 
they all instances picks this up by
 
subscription and adds a road to the grid
 
a rendering of the new house that we created and of course I
 
can immediately double-click it to
 
execute the first navigate action to
 
set some properties 456 and head back four five six but I
 
can just cancel all this out, like that
 
discard changes, yes please, ok but then
 
what I actually were about to say is
 
that we had two options before to either
 
do view model actions that are endemic to
 
a certain view or a class action which
 
are available wherever a class is visible
 
let's do a class action that does the
 
same thing as show house just to see
 
what the difference is "show house from object"
 
but it's really from object so it's an action on the
 
class "house and the bring up the view
 
model should be "house view and the view
 
model root object and now it's
 
interesting because now we are in the
 
context of the house so we might as well
 
just to "self", so the root object
 
expression is just "self", in this case and
 
if we head back to the view mode left
 
there we see that show house from object
 
will show up in these two places and if
 
we were to re-read the model here and
 
"show all houses" we see that it's
 
available here and it's available here
 
but both are disabled because even if
 
the action is potentially available, it
 
needs an object to act on and this one
 
will never have an object because our
 
view is not rooted in a house it's null
 
but this one that supports the grid
 
should be able to get an object once we've select one
 
so when I select one this one
 
is enable and this one will do the same
 
thing as the other one here we see an interesting thing that
 
since this action is available wherever
 
the object is shown is also available
 
from here so show house from object will
 
automatically show up here because this
 
is the house so heading back to view
 
model editor we probably first would like
 
to opt out the show house from object
 
on the root level because that we always
 
be disabled away with that now it lives here
 
that's fine and in the house
 
view it's not really helpful to the user
 
to have an action that points back at
 
the same object in this case so we want
 
to opt that out as well the fresh
 
so once we select one it's enabled and
 
we can click it and it's not shown here
 
so that's more like what we want so
 
keeping track of actions and what's
 
available and opted out etc can be quite the work in the end and this is
 
true for all applications what navigates
 
where we're to track things and how
 
can you get here at least with our
 
strategy fully modeled and the fully
 
decorative, you will have all the
 
information readily available for you
 
and also we have a special view the action
 
crossref that renders like this so
 
actions leading here our show house and
 
show house from object so that's one way
 
of getting to the house view but and
 
there is an action show house from
 
object that is opted out if I would like to opt it in
 
I can just click the line and that would
 
be great so that would mean that this
 
action is available again from here but
 
since I don't want that I will opt it out
 
and then it's gone, so from the old houses
 
I see that there is an action show "all
 
houses" that leads here and there are
 
these actions available to the user from
 
this UI there's one called "AddNewHouse"
 
and there is a show house from object
 
which potentially is available from the
 
root but in our case it's not we don't
 
want that so that's opted out red and
 
there are these two that are available
 
from objects in the grid
 
so that's one way to define cross references
 
for the actions, another way to follow through is 22
 
let's show all actions here and show
 
house from object and here we see a hint
 
that action shows in one place to places
 
are opted out let's get an overview by
 
following this view and that it's rendered
 
like this all the view models where this
 
action may come into play and remember
 
that was a class action so it will come
 
into play wherever the class is viewed
 
and if it's opted out red or opted-in
 
green so here we get a a way to see how
 
the actions interact with each other we
 
also have closed up one and go
 
back to the overview if you remember
 
from part 1 of this series we had the
 
view models option here in the overview
 
it didn't show anything when we showed it before that
 
now it shows the to view models and we
 
also have the action navigations and the
 
ones that we could refresh like this and
 
then we see that we have a navigation
 
tree or a storyboard or something like that
 
views "show.allhouses" goes to the show
 
houses from there we have show house and
 
show house from object but this one is
 
shown elsewhere
 
namely here so as your application grows
 
this tree will grow and if we were to
 
have any view models that has been stale
 
not able to reach them from any action
 
they would show up here and the last one
 
that live 3d rendering should ok it is
 
so these are all the classes that are
 
available in the model and an
 
auto generated diagram for that and
 
this is the view models available and
 
the classes and the diagrams so as I
 
said this is still working progress
 
we're going to find a way to make this usable but currently it's just like eye candy
 
alright, so whenever round this session up it was a session on how action stays
 
together with view models basically
 
thank you very much for watching and then I'll be back

Latest revision as of 15:36, 10 February 2024

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Running prototyper application More on WECPOF Action Definitions editor • Global actions Bring Up a View Model • ViewModel root object • Menu groups • Create/Init standart actions • Framework actions Nested ViewModel class • Grid options • Expressions • Global Action for Create/Global Action for show ViewModel action Class action Navigating Actions 3d rendering

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