MDriven Designer Overview part 3
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'''Raw video subtitles'''
I welcome back this is part three of
the MDriven overview
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

Revision as of 21:55, 15 April 2017

Review on the WECPOF prototyper application and continue on prototyping with actions and viewmodels.

To make your experience more comfortable, we set the main tags mentioned in the video to the right bar menu of this mini player. Choose the interesting subtitle on the list and immediately get to the exact theme timeplace in the video. Now you can pick any topic to be instructed without watching the whole video.


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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