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• How Can I Add a New Command to a Control's Event

  - by Chris

  Hi, thanks for taking a look at this question. I have been building an application (VB/WPF) following Josh Smith's example of an MVVM pattern: Click here to view My Views have Controls which trigger a Command upon an event, such as a button click and these are bound to properties in the ViewModel. My ViewModel exposes properties of type ICommand which invoke the appropriate methods. This has worked well, until now! I now want to use a Thumb Control to allow a user to move an object within a Canvas. I don't believe that the Thumb has a Command capability 'out of the box'. A Thumb raises a 'DragDelta' event when being moved. So my question is as follows: How do I extend a Control's capability to issue a Command upon an event please? I wish to issue a new Command, let's say 'onDragDelta' so that I can bind it to a property in my ViewModel just like my Buttons. Thank you very much

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• Extending Object in Javasript

  - by smsteel

  I'm trying to extend Object functionality this way: Object.prototype.get_type = function() { if(this.constructor) { var r = /\W*function\s+([\w\$]+)\(/; var match = r.exec(this.constructor.toString()); return match ? match[1].toLowerCase() : undefined; } else { return typeof this; } } It's great, but there is a problem: var foo = { 'bar' : 'eggs' }; for(var key in foo) { alert(key); } There'll be 3 passages of cycle. Is there any way to avoid this?

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• Putting a block inside another in Django

  - by hekevintran

  I have a Django template that I want to extend in multiple places. In some the div must be inside a form, and in others it must not be. To do this I put a block above and below the div so I could add and in them respectively. Desired: <form> <div class="my_div"> {% block div_content %} ... {% endblock %} </div> </form> Template: {% block div_top %}{% endblock %} <div class="my_div"> {% block div_content %} {% endblock %} </div> {% block div_bottom %}{% endblock %} Looking at this I can't help but think that there is a better way to do it. What is the standard Django way of doing this?

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• NFS Server in Java

  - by dmeister

  I search an implementation of a network (or distributed) file system like NFS in Java. The goal is to extend it and do some research stuff with it. On the web I found some implementation e.g. DJ NFS, but the open question is how mature and fast they are. Can anyone purpose a good starting point, has anyone experience with such things? P.S. I know Hadoop DFS and I used it for some projects, but Hadoop is not a good fit for the things I want to do here. --EDIT-- Hadoop is really focused on highly scalable, high throughput computing without the possibilities to overwrite parts of a file and so an. The goal is you could use the filesystem e.g. for user home directories. --EDIT-- More Details: The idea is to modify such a implementation so that the files are not stored directly on a local filesystem, but to apply data de-duplication.

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• Spring/Hibernate/Junit example of testing DAO against HSQLDB

  - by Ryan P.

  Hi guys, I'm working on trying to implement a JUnit test to check the functionality of a DAO. (The DAO will create/read a basic object/table relationship in HSQLDB). The trouble I'm having is the persistence of the DAO (for the non-test code) is being completed through an in-house solution using Spring/Hibernate, which eliminates the usual *.hbm.xml templates that most examples I have found contain. Beacuse of this, I'm having some trouble understanding how to setup a JUnit test to implement the DAO to create/read (just very basic funtionality) to an in-memory HSQLDB. I have found a few examples, but the usage of the in-house persistence means I can't extend some of the classes the examples show (I can't seem to get the application-context.xml setup properly). Can anyone suggest any projects/examples I could take a look at (or any documentation) to further my understanding of the best way to implement this test functionality? I feel like this should be really simple, but I keep running into problems implementing the examples I have found. Thanks in advance!

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• Windows Workflow Foundation: Multiple applications

  - by Petr Felzmann

  We are running several ASP.NET applications (one per customer) based on our custom framework (which just extend ASP.NET). Each web application use its own database (Initial Catalog in the term of connection string). Now we would like to add workflow capability to the applications (to our framework respectively). The particular workflows will be the same for all the applications only some initial settings of each workflow can vary, e.g. in one application the e-mail will be send to the user X, but in other application to the user Y. The question is if we can install one workflow engine (with one database for persistence) and share this for all workflows in all web applications. If so, how then workflow engine get knows the particular workflow belongs to which web application? Should we store some application identifier somewhere in workflow? Thanks for suggestions!

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• Adding KeyListener to a JWindow not getting any key events

  - by Untitled

  Hello everyone, In Java, I am adding a KeyListener to a JWindow, but it is not getting any key events. If I used the same code but extend a JFrame instead, then everything works fine. public class MyWindow extends JWindow { ... ... private void initComponents() { ... ... addKeyListener(new KeyListener() { public void keyPressed(KeyEvent e) { System.out.println("KEY PRESSED: " + e.getKeyCode()); } public void keyReleased(KeyEvent e) { System.out.println("KEY RELEASED: " + e.getKeyCode()); } public void keyTyped(KeyEvent e) { System.out.println("KEY TYPED: " + e.getKeyCode()); } }); } } Anyone know how can I solve this by using a JWindow? Please note that I am using Linux, so I am not sure if it is something to do with the platform. Thanks

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• rails wiki site - article edit highlighting/strikethrough with htmldiff maxes cpu

  - by mark

  Hi I'm implementing a wiki style site and want to highlight changes made to articles between successive versions. Using htmldiff to highlight changes works great, except it is rather cpu intensive. I'm using the awesome vestal_versions plugin for versioning. So how best to handle this? I considered having an on_create callback on version creation create a delayed job that processes and then stores the htmldiff processed article (in the version table row). If this is a good approach, how can I extend vestal_versions without touching the gem? Or maybe there would be a better approach. Any advice is much appreciated. :)

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• Constraining window position to desktop working area

  - by simplecoder

  I want to allow a user to drag my Win32 window around only inside the working area of the desktop. In other words, they shouldn't be able to have any part of the window extend outside the monitor(s) nor should the window overlap the taskbar. I'd like to do it in a way that does cause any stuttering. Handling WM_MOVE messages and calling MoveWindow() to reposition the window if it goes off works, but I don't like the flickering effect that's caused by MoveWindow(). I also tried handling WM_MOVING which prevents the need to call MoveWindow() by altering the destination rectangle before the move actually happens. This resolves the flickering problem, but another issue I run into is that the cursor some times gets aways from the window when a drag occurs allowing the user to drag the window around while the cursor is not even inside the window. How do I constrain my window without running into these issues?

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• How do I identify an OpenID provider as requiring Directed Identity?

  - by Skrat

  I am trying to extend the LightOpenID PHP library to "discover" that an identity provider requires Directed Identity. This should be easy as the library is beautifully well written and wonderfully clean but I don't know how to identify these types of providers. A couple things I've tried: I looked through the OpenID specs on the subject but came up empty handed. Looked through the PHP OpenID library but couldn't figure out how this info was gathered during the discovery. Dumped all the data (headers and content) that came from the servers by injecting some code in LightOpenID but didn't see anything helpful. Searched Google and Stackoverflow, naturally. How do providers identify themselves as requiring "Directed Identity" authentication? Surely there is a carefully defined specification for this... somewhere. Anyone know where I can find more on this?

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• What's the best self-tracking software for Linux?

  - by trench

  I'm looking for a way to track myself and receive quality data upon which I can write future scripts/programs. For example, I use Google Reader a lot. I'd like to track the hrefs that garner my clicks. Further, I'd like to drop all of the words of each href into a database where they can be stacked in a hierarchical manner. At the end of the week I want to know that "Ubuntu" garnered 448 clicks and "Cheetos" garnered 2. :) That's just one example... I'd like this tracking and data-collecting to extend beyond my browser. I know writing something to do this myself wouldn't be too awfully difficult but if something already exists I'd happily use it. Thanks in advance. Primary OS: Ubuntu 10.04

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• Specifying distinct sequence per table in Hibernate on subclasses

  - by gutch

  Is there a way to specify distinct sequences for each table in Hibernate, if the ID is defined on a mapped superclass? All entities in our application extend a superclass called DataObject like this: @MappedSuperclass public abstract class DataObject implements Serializable { @Id @GeneratedValue(strategy = GenerationType.SEQUENCE) @Column(name = "id") private int id; } @Entity @Table(name = "entity_a") public class EntityA extends DataObject { ... } @Entity @Table(name = "entity_b") public class EntityB extends DataObject { ... } This causes all entities to use a shared sequence, the default hibernate_sequence. What I would like to do is use a separate sequence for each entity, for example entity_a_sequence and entity_b_sequence in the example above. If the ID were specified on the subclasses then I could use the @SequenceGenerator annotation to specify a sequence for each entity, but in this case the ID is on the superclass. Given that ID is in the superclass, is there a way I can use a separate sequence for each entity — and if so, how? (We are using PostgreSQL 8.3, in case that's relevant)

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• TooManyRowsAffectedException with encrypted triggers

  - by Jon Masters

  I'm using nHibernate to update 2 columns in a table that has 3 encrypted triggers on it. The triggers are not owned by me and I can not make changes to them, so unfortunately I can't SET NOCOUNT ON inside of them. Is there another way to get around the TooManyRowsAffectedException that is thrown on commit? Update 1 So far only way I've gotten around the issue is to step around the .Save routine with var query = session.CreateSQLQuery("update Orders set Notes = :Notes, Status = :Status where OrderId = :Order"); query.SetString("Notes", orderHeader.Notes); query.SetString("Status", orderHeader.OrderStatus); query.SetInt32("Order", orderHeader.OrderHeaderId); query.ExecuteUpdate(); It feels dirty and is not easily to extend, but it doesn't crater.

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• Office Automation Libraries

  - by Ian

  Some time ago I posted about a question about reading Excel files as a server process, to get around the tighter restrictions Microsoft have been applying on Office Automation. I now need to extend this, by finding methods/libraries to read other sorts of Office files in an automated way on a server. The applications I'm interested in are Word, Powerpoint, Project and to a lesser extent Word and Visio. I need to be able to support 97-2003 office files, and the newer open xml formats (e.g. xlsx, docx) at a very least. With regards to Word integration, I also need to be able to handle writing/reading RTF text. If anyone has any suggestions I'd be pleased to hear them. Thanks

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• Grails GORM on multiple Forms

  - by Fabien Barbier

  Usually I'm using One-to-many relationship by this way : class Subject { static hasMany = [ crfs : Crf ] String name ... } class Crf { String title String info ... } I can extend this relationship to others domains, Ex : static hasMany = [ crfs : Crf, crfb : CrfBlood ...] But in my case I have to link the Subject domain to 30 others domains, maybe more...(ex : CrfBlood, CrfMedical, crfFamily, etc...). What domain model implementation should I use in my case ? I would like to keep the dynamic finders usability in my project.

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• Struct in C, are they efficient?

  - by pygabriel

  I'm reading some C code like that: double function( int lena,double xa,double ya, double za, double *acoefs, ..., int lenb,double xb,double yb, double zb, double *bcoefs, ..., same for c, same for d ) This function is called in the code mor than 100.000 times so it's performance-critical. I'm trying to extend this code but I want to know if it's efficient or not (and how much this influences the speed) to encapsulate all the parameters in a struct like this struct PGTO { int len; double x,y,z ; double *acoefs } and then access the parameters in the function.

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• How do I implement a custom Brush in WPF?

  - by MojoFilter

  Where can I find out enough info about how Brushes work to implement my own System.Windows.Media.Brush? I can handle all of the freezable baggage, but it's not really obvious what I need to override to get it to work. Yeah, so I didn't mean that I want to use a predefined brush. I want to extend System.Windows.Media.Brush, which is an abstract class. This is all purely for my own edification. I'm not even sure what kind of brush I could make. I was just trying to learn how brushes work. As in: public AwesomeBrush : Brush { protected override Freezable CreateInstanceCore() { return new AwesomeBrush(); } ... // concrete brush stuff }

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• ezpublish for practical e-commerce?

  - by Olaseni

  For while now I have been using ezpublish as a framework, and CMS when my web projects are based on PHP, and I must say, I have grown accustomed to it because of its flexibility for most scenarios. However, I've had to build e-commerce sites now and then, and ezpublish includes a webshop that caters for the e-commerce needs of your installation, and of-course with all the tools you need to extend, should you need to. Is it worthwhile and optimal to use the inbuilt webshop for an e-commerce solution, or should I rather go with an all out e-commerce solution like Magento, which has made a significant impact in that sector?

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• jQuery plugin options: required, optional, inaccessible

  - by Trevor Hartman

  I'm curious how to specify options to a jQuery plugin in a way that some are required, some are optionally overridden, and some can't be touched. I started off with the usual: jQuery.fn.plugin = function (options){ var defaults = { username: "", posts:10, api: "http://myapi.com" } var settings = jQuery.extend({}, defaults, options); } Let's say I want username to be required, posts is optional (defaults to 10) and you (you being the user of the plugin) can't change api, even if they try. Ideally, they'd all still be in the same data structure instead of being split into separate objects. Ideas?

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• Python Closures Example Code

  - by user336527

  I am learning Python using "Dive Into Python 3" book. I like it, but I don't understand the example used to introduce Closures in Section 6.5. I mean, I see how it works, and I think it's really cool. But I don't see any real benefit: it seems to me the same result could be achieved by simply reading in the rules file line by line in a loop, and doing search / replace for each line read. Could someone help me to: either understand why using closures in this example improves the code (e.g., easier to maintain, extend, reuse, or debug?) or suggest a source of some other real-life code examples where closures really shine? Thank you!

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• Adding to the browser user agent string?

  - by stwissel

  I have a plug-in that handles its own url schema (something like mystuf:// ). If a user clicks on such a link when the plug-in isn't installed (s)he gets an ugly error. So I extended my installer to write into the Registry (for Internet Explorer) and the user.js (for Firefox) to ADD a custom string to the user agent string. These additions survive a browser upgrade nicely (Microsoft uses this technique to indicate the presence of the dotNet Framework). Now I need to extend this to Apple Safari and Google Chrome on all supported platforms. To be clear: I'm not looking how to REPLACE the user agent string, but how to amend it with additional information. Any hint?

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• Is it possible to build a JPA entity by extending a POJO?

  - by Freiheit

  Lets say I have the following POJO: public class MyThing { private int myNumber; private String myData; //assume getter/setter methods } Is it now possible to extend this POJO as a JPA entity? @Entity @Table(name = "my_thing") public class MyThingEntity extends MyThing implements Serializable { @Column(name = "my_number") //????????? @Column(name = "my_data") //???????? } I want to keep the POJO separate from the JPA entity. The POJO lives in a different project and is often used without a persistence layer, my project wants to persist it in a database and do so without the overhead of mapping from a POJO to an entity and back. I understand that JPA entities are POJOs, but in order to use it I would have to include a library that implements javax.persistence and the other projects using the same base object have no use for a persistence layer. Is this possible? Is this a good idea?

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• Python: create a function to modify a list by reference not value

  - by Jonathan

  Hey all- I'm doing some performance-critical Python work and want to create a function that removes a few elements from a list if they meet certain criteria. I'd rather not create any copies of the list because it's filled with a lot of really large objects. Functionality I want to implement: def listCleanup(listOfElements): i = 0 for element in listOfElements: if(element.meetsCriteria()): del(listOfElements[i]) i += 1 return listOfElements myList = range(10000) myList = listCleanup(listOfElements) I'm not familiar with the low-level workings of Python. Is myList being passed by value or by reference? How can I make this faster? Is it possible to somehow extend the list class and implement listCleanup() within that? myList = range(10000) myList.listCleanup() Thanks- Jonathan

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• SpineJS and RequireJS

  - by ot3m3m

  I am using require.js 2.0. I have the following code that is called initially by require: app.js requirejs.config({ paths: { app: '..', spine: 'spine_src/spine', cs: "cs", }, shim: { 'spine_src/route': { deps: ['spine'] } } }); // Start the main app logic. requirejs(['cs!app/StartApp_Admin', 'spine','spine_src/route'], function (StartApp_Admin, Spine, Route) { { new StartApp_Admin(); } }); And the following controller: StartApp_Admin define () -> class StartApp_Admin extends Spine.Controller constructor: -> @routes "/twitter/:id": (params) -> console.log("/users/", params.id) Spine.Route.setup() When I execute the application I get the following error in my spine route library file (route.js). The application breaks when I call Spine.Route.setup() Uncaught TypeError: Object function (element) {return element;} has no method 'extend' Any help would be greatly appreciated

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• Android Class which extends Dialog, how to clear TextViews before it is displayed

  - by wuntee

  I have a class that extends android.app.Dialog, the layout is done in an xml file, and the setup (button listeners, etc) is done on the onCreate method. My problem is that whenever the dialog is displayed, then dismissed, and displayed again, the Editable TextViews are still populated with the information that was displayed previously. What is the common way to clear these text fields? Remember - this is a separate class that extends Dialog - so there is no 'onDialogCreate' like Activity has. Or, perhaps I am extending the wrong class? There is just a lot of processing being done, and do not want to have all the code in the main Activity. I would like it to be in a separate Class. I tried to extend AlertDialog, but it does not create the border like Dialog does. Any help would be great. The dialog is shown via the Activity: protected Dialog onCreateDialog(int id) { switch(id){ case DIALOG_NEW_SAFE: return(new NewSafeDialog(this)); default: return(null); } }

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