I have wxDataViewCtrl and I want to create filters like following:
One way I can modify wxDataModel and notify the control about the change.
Is there any other way to achieve the same without modifying wxDataMdel.
Normally you wouldn't really modify the data stored by the model but rather apply the filters on the fly in your custom model, i.e. take them into account in your overridden GetValue(). But you do need to do something at the model level to implement filtering, there is no way to do it at the UI/view level only.
Related
Is there a way to add Validation to a property on my VM "dynamically" (i.e. sometime after I register the initial rules on the VM)?
Currently, I'm registering the rules in the constructor of the VM, then a little while later, after the user has entered a bunch of data, I need to show a new field (using if.bind) and want to add validation depending on the result of a web api call..
Wondering if there's an API for this that I've missed?
You can achieve it without dynamically adding rule but instead you can use satisfiesRule and when, see it here in section Conditional Validation. satisfiesRule will only evaluated if the property that attached to it is already pass.
when will only evaluated the rule if the condition is true.
Additional link.
If you're using bootstrap, you can find this useful.
I have been given this task and would appreciate it if someone helped really. I built a Graphical Model through GMF, which is as follows;
As you see one of the nodes in the model has been selected. The task here is to create an eclipse view with a table, which will be automatically updated upon the selection of a so-called "City Node". As you may guess from the model, the table should contain path costs to all of the cities. I will later expand my solution to include a modified Dijkstra Algorithm but right now i am stuck in the creation of a table view.
I tried to build it using a TableViewer but it seems fairly complex since we need to set the input of the table on ContentProvider, but the twist here is that since we need a SelectionListener to obtain the City Coordinates (as it was ordered to calculate path-costs through the distance between two connected cities divided by the max speed, which was indicated on the connecting streets in the graph) and also the currently selected city, the path-costs need to be automatically calculated and displayed in the table upon the receipt of a click-event. This means that we somehow need to update the input which is gonna be handed to ContentProvider on every selection change.
For further information, I get the current selection through selectionChanged method of ISelectionListener interface and inside this method I put the city information in an arraylist. However although i declared this arraylist outside of the method as public, I cannot seem to access it from the outside of the method and thus can not pass it contentProvider. Eventually the input of the table can not be updated. I tried to write this text as simple as possible and I hope you guys can help me. As I can not foresee now what should be done, I would really appreciate it.
You're on the right track!
In your selection listener's ISelectionListener.selectionChanged method you just have to set the new input for the viewer with TableViewer.setInput. Then, the IStructuredContentProvider.inputChanged method gets invoked on the content provider for the viewer. It's here where you can do your stuff with the new input and refresh the viewer with TableViewer.refresh.
You can also use the JFace databinding framework, but I think you should be fine with what I've mentioned above.
I am creating a new web app and would like some help on design plans.
I have "store" objects, and each one has a number of "message" objects. I want to show a store page that shows this store's messages. Using Doctrine, I have mapped OneToMany using http://symfony.com/doc/current/book/doctrine.html
However, I want to show messages in reverse chronological order. So I added a:
* #ORM\OrderBy({"whenCreated" = "DESC"})
Still I am calling the "store" object, then calling
$store->getMessages();
Now I want to show messages that have been "verified". At this point, I am unsure how to do this using #ORM so I was thinking I need a custom Repository layer.
My question is twofold:
First, can I do this using the Entity #ORM framework?
And second, which is the correct way to wrap this database query?
I know I eventually want the SQL SELECT * FROM message WHERE verified=1 AND store_id=? ORDER BY myTime DESC but how to make this the "Symfony2 way"?
For part 1 of your question... technically I think you could do this, but I don't think you'd be able to do it in an efficient way, or a way that doesn't go against good practices (i.e. injecting the entity manager into your entity).
Your question is an interesting one, because at first glance, I would also think of using $store->getMessages(). But because of your custom criteria, I think you're better off using a custom repository class for Messages. You might then have methods like
$messageRepo->getForStoreOrderedBy($storeId, $orderBy)
and
$messageRepo->getForStoreWhereVerified($storeId).
Now, you could do this from the Store entity with methods like $store->getMessagesWhereVerified() but I think that you would be polluting the store entity, especially if you need more and more of these custom methods. I think by keeping them in a Message repository, you're separating your concerns in a cleaner fashion. Also, with the Message repository, you might save yourself a query by not needing to first fetch your Store object, since you would only need to query to Message table and use its store_id in your WHERE clause.
Hope this helps.
I'm creating an app in Rails that is essentially a holiday management tool. Employee requests holiday; email sent to manager for approval; manager approves/rejects etc.
The app will allow whole or half-day holidays to be taken and I'm wondering about the best way to handle the half-days. I don't want to present the user with a time picker. I would prefer to offer a date-picker and AM/PM checkboxes.
I suppose I'm looking for opinion on whether I should 1) use the chosen date in conjunction with say the AM checkbox to create a DateTime entry in the DB e.g. leave starts on 10 February in the AM = "2011-02-10 00:00" or 2) should I simply record a Date in the DB with a string reference to AM in a separate field.
I want to output leave in the form of .ics files and a stream so the first option to me makes the most sense but is likely to create a real fudge in the code. Any thoughts or further options appreciated.
Thanks
Robin
Why not create durations (pairs of datetimes) for every holiday rather than just one? That should model the ical representation better than just storing single times as events.
As far as how to handle that at the view level, you're probably going to want to use the Presenter Pattern since you're really manipulating events rather than times.
A presenter is basically a proxy with added business logic that represents a better mapping for how the view interacts with the model.
It's a lightweight layer (they're normally just normal Ruby classes, rather than AR::Base or other heavyweight rails models) that wrap your models, and are usually instantiated at the controller level, and passed to your views rather than the model themselves.
http://blog.jayfields.com/2006/09/rails-model-view-controller-presenter.html
http://blog.jayfields.com/2007/03/rails-presenter-pattern.html
http://www.slideshare.net/adorepump/presenting-presenters-on-rails
Here's what I mean: https://gist.github.com/984025
I have a case where one of the columns on the database is generated using a trigger because of a specific way we generate this value which I can't change. If I in my mapping in NHibernate sets the property to generated=insert, it works like a charm, where NHibernate inserts the row without the generated property, and afterwards does a select to pull the value from the database.
But I also have cases where I want to be able to set the property explicitly (the trigger is built to only set the column if it's not set). But I can't get NHibernate to allow me to do this. When it's set to generated=insert, it will always ignore the property I set in my object. So I really want to be able to somehow tell NHibernate that when the property is "untouched"/null, act as property is generated, but if set, don't.
Is it possible to configure NHibernate this way somehow?
I don't think you can achieve this through configuration. However, you can simply call ISession.Refresh(myObject) after an insert to force it to go back to the database and refresh the object.
Documentation for the generated property states (emphasis mine):
Properties marked as generated must additionally be non-insertable and non-updateable. Only Section 5.1.7, “version (optional)”, Section 5.1.8, “timestamp (optional)”, and Section 5.1.9, “property” can be marked as generated.
Is it a property that can be set as nullable in your domain model so on the initial insert nothing goes into it and your trigger still thinks it's untouched?
My domain model allows for null insertion of the value. And my trigger is made to only set the column if null inserted. What I'm trying to achieve is to at runtime decide, wether or not NHibernate should handle it as a generated property.
But from what I can understand, NHibernate does not have this sort of flexibility and somewhat strides against it's configuration structure where it builds a session factory once for multiple uses.
The alternative solution could be to build two session factories, one for each of my scenarios.
The first (where property is generated) is normal usage.
The second (where property is non-generated) is during upload scenarios where I need to maintain the property value in the code.
I'm using FluentNHibernate for the mappings, and since it reflects over my mapping classes, I could set a state during creation of session factories, so when my mapping is being read, I could do an if/else statement based on which session factory is currently being built. This should allow me to achieve both without duplicate configurations, although with two session factories in play instead of one.
I haven't tried it yet, only theory, but it should solve my problem and hopefully others trying to achieve similar.