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• Unnecessary scroll bars appearing in IE8

  - by Abhishek Jain

  Hi, In my web app there is a page(ChildPage) which is actually contained in an iframe element of another page(ParentPage). This ChildPage has its contents placed in ContentPlaceHolder of a MasterPage. <div id="DivScroll" runat="server" style="overflow-y: auto; overflow-x: auto; width: 100%; height: 100%;"> <asp:ContentPlaceHolder ID="ContentPlaceHolder1" runat="server"> </asp:ContentPlaceHolder> </div> As apparent in the code, contents of ChildPage are scrollable in the div containing it. There is never the need for the scroll bars of browser to appear and it is working this way till IE7. In IE8 browser scrollbras are appearing due to the presence of the following div in ChildPage. <div class="ReadOnlyFlat" id="Div1" style="z-index: 100; visibility: hidden; overflow: auto; width: 100%; position: absolute; height: 300px" runat="server" ms_positioning="FlowLayout"> <radA:RadAjaxPanel ID="RadAjaxPanelA" EnableOutsideScripts="True" runat="server"> <radT:RadTreeView ID="RadTreeView2" TabIndex="1" runat="server" Skin="web20"> <NodeTemplate> <asp:Label ID="Label2" runat="server">Label</asp:Label> <asp:Label ID="Label4" runat="server" Width="10px"></asp:Label> <asp:Label ID="Label3" runat="server" ForeColor="#FF8000" Font-Bold="True">Label</asp:Label> </NodeTemplate> </radT:RadTreeView> </radA:RadAjaxPanel> What actually happens in IE8 is as follows: The above div Div1 is diaplyed on the click of an ImageButton. On the page load this ImageButton is present on the bottom of the page. In this case IE8 shows browser's vertical scrollbar due to height of Div1. When I scroll DivScroll shown in first code snippet, the ImageButton moves up. When the ImageButton is moved sufficiently up so that it is above the bottommost part of page by more than 300px(i.e, the height of Div1) and if I click the ImageButton, the browser's vertical scrollbars disappear. Browser's vertical scrollbar appears in case the distance between ImageButton and the bottom most part of page is less than height of Div1 and disappears when the distance is more than height of Div1. I need that the browser's vertical scrollbar never appears. Please Help.

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• How can we implement change notification propagation for WPF and SL in the MVVM pattern?

  - by Firoso

  Here's an example scenario targetting MVVM WPF/SL development: View data binds to view model Property "Target" "Target" exposes a field of an object called "data" that exists in the local application model, called "Original" when "Original" changes, it should raise notification to the view model and then propogate that change notification to the View. Here are the solutions I've come up with, but I don't like any of them all that much. I'm looking for other ideas, by the time we come up with something rock solid I'm certain Microsoft will have released .NET 5 with WPF/SL extensions for better tools for MVVM development. For now the question is, "What have you done to solve this problem and how has it worked out for you?" Option 1. Proposal: Attach a handler to data's PropertyChanged event that watches for string values of properties it cares about that might have changed, and raises the appropriate notification. Why I don't like it: Changes don't bubble naturally, objects must be explicitly watched, if data changes to a new source, events must be un-registered/registered. Why I kind of like it: I get explicit control over propogation of changes, and I don't have to use any types that belong at a higher level of the application such as dependancy properties. Option 2. Proposal: Attach a handler to data's PropertyChanged event that re-raises the event across all properties using the name property name. Why I don't like it: This is essentially the same as option 1, but less intelligent, and forces me to never change my property names, as they have to be the same as the property names on data Why I kind of like it: It's very easy to set up and I don't have to think about it... Then again if I try to think, and change names to things that make sense, I shoot myself in the foot, and then I have to think about it! Option 3. Proposal: Inherit my view model from dependancy object, and notify binding sources of changes directly. Why I don't like it: I'm not even 100% sure dependancy properties/objects can DO this, it was just a thought to look into. Also I don't personally feel that WPF/SL types like Dep Obj belong at the view model level. Why I kind of like it: IF it has the capability that I'm seeking then it's a good answer! minus that pesky layering issue. Option 4. Proposal: Use a consistant agent messaging system based off of Task Parallels DataFlow Library to propogate everything through linked pipelining. Why I don't like it: I've never tried this, and somehow I think it will be lacking, plus it requires me to think about my code completely differently all the way around. Why I kind of like it: It has the possiblity of allowing me to do some VERY fun manipulations with a push based data model and using ActionBlocks as validation AND setters to then privately change view model properties and explicitly control PropertyChanged notifications.

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• Encrypted AES key too large to Decrypt with RSA (Java)

  - by Petey B

  Hello, I am trying to make a program that Encrypts data using AES, then encrypts the AES key with RSA, and then decrypt. However, once i encrypt the AES key it comes out to 128 bytes. RSA will only allow me to decrypt 117 bytes or less, so when i go to decrypt the AES key it throws an error. Relavent code: KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA"); kpg.initialize(1024); KeyPair kpa = kpg.genKeyPair(); pubKey = kpa.getPublic(); privKey = kpa.getPrivate(); updateText("Private Key: " +privKey +"\n\nPublic Key: " +pubKey); updateText("Encrypting " +infile); //Genereate aes key KeyGenerator kgen = KeyGenerator.getInstance("AES"); kgen.init(128); // 192/256 SecretKey aeskey = kgen.generateKey(); byte[] raw = aeskey.getEncoded(); SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES"); updateText("Encrypting data with AES"); //encrypt data with AES key Cipher aesCipher = Cipher.getInstance("AES"); aesCipher.init(Cipher.ENCRYPT_MODE, skeySpec); SealedObject aesEncryptedData = new SealedObject(infile, aesCipher); updateText("Encrypting AES key with RSA"); //encrypt AES key with RSA Cipher cipher = Cipher.getInstance("RSA"); cipher.init(Cipher.ENCRYPT_MODE, pubKey); byte[] encryptedAesKey = cipher.doFinal(raw); updateText("Decrypting AES key with RSA. Encrypted AES key length: " +encryptedAesKey.length); //decrypt AES key with RSA Cipher decipher = Cipher.getInstance("RSA"); decipher.init(Cipher.DECRYPT_MODE, privKey); byte[] decryptedRaw = cipher.doFinal(encryptedAesKey); //error thrown here because encryptedAesKey is 128 bytes SecretKeySpec decryptedSecKey = new SecretKeySpec(decryptedRaw, "AES"); updateText("Decrypting data with AES"); //decrypt data with AES key Cipher decipherAES = Cipher.getInstance("AES"); decipherAES.init(Cipher.DECRYPT_MODE, decryptedSecKey); String decryptedText = (String) aesEncryptedData.getObject(decipherAES); updateText("Decrypted Text: " +decryptedText); Any idea on how to get around this?

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• WSIT, Maven, and wsimport -- Can They Work Together?

  - by rtperson

  Hi all, I'm working on a small-ish multi-module project in Maven. We've separated the UI from the database layer using Web Services, and thanks to the jaxws-maven-plugin, the creation of the WSDL and WS client are more or less handled for us. (The plugin is essentially a wrapper around wsgen and wsimport.) So far so good. The problem comes when I try to layer WSIT security into the picture. NetBeans allows me to generate the security metadata easily, but wsimport seems completely incapable of dealing with anything beyond a Basic-auth level of security. Here's our current, insecure way of calling wsimport during a Maven build: <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>jaxws-maven-plugin</artifactId> <version>1.10</version> <executions> <execution> <goals> <goal>wsimport</goal> </goals> <configuration> <wsdlUrls> <wsdlUrl>${basedir}/../WebService/target/jaxws/wsgen/wsdl/WebService.wsdl</wsdlUrl> </wsdlUrls> <packageName>com.yourcompany.appname.ws.client</packageName> <sourceDestDir>${basedir}/src/main/java</sourceDestDir> <destDir>${basedir}/target/jaxws</destDir> </configuration> </execution> </executions> </plugin> I have tried playing around with xauthFile, xadditionalHeaders, passing javax.xml.ws.security.auth.username and password through args. I have also tried using wsimport from the command line to point to the Tomcat-generated WSDL, which has the additional security info. Nothing, however, seems to change the composition of the wsimport-generated files at all. So I guess my question here is, to get a WSIT-compliant client, am I stuck abandoning Maven and the jaxws plugin altogether? Is there a way to get a WSIT client to auto-generate? Or will I need to generate the client by hand? Let me know if you need any additional info beyond what I've written here. I'm deploying to Tomcat, although that doesn't seem to be an issue, as Maven seems happy to pull Metro into the deployed WAR file. Thanks in advance!

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• Simplify CASE in VB.net code

  - by StealthRT

  Hey all, i am looking here to see if anyone would have a better way to acomplish this task below in less code. Select Case mainMenu.theNumOpened Case 1 Me.Text = "NBMsg1" Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case 2 Me.Text = "NBMsg2" Dim hwnd As IntPtr = FindWindow(vbNullString, "NBMsg1") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, Me.Height + 10, 0, 0, 1) Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case 3 Me.Text = "NBMsg3" Dim hwnd As IntPtr = FindWindow(vbNullString, "NBMsg2") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, Me.Height + 10, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg1") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 2) + 15, 0, 0, 1) Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case 4 Me.Text = "NBMsg4" Dim hwnd As IntPtr = FindWindow(vbNullString, "NBMsg3") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, Me.Height + 10, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg2") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 2) + 15, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg1") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 3) + 20, 0, 0, 1) Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case 5 Me.Text = "NBMsg5" Dim hwnd As IntPtr = FindWindow(vbNullString, "NBMsg4") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, Me.Height + 10, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg3") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 2) + 15, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg2") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 3) + 20, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg1") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 4) + 25, 0, 0, 1) Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case 6 Me.Text = "NBMsg6" Dim hwnd As IntPtr = FindWindow(vbNullString, "NBMsg5") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, Me.Height + 10, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg4") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 2) + 15, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg3") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 3) + 20, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg2") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 4) + 25, 0, 0, 1) hwnd = FindWindow(vbNullString, "NBMsg1") SetWindowPos(hwnd, 0, My.Computer.Screen.WorkingArea.Width - 302, (Me.Height * 5) + 30, 0, 0, 1) Me.SetDesktopLocation(My.Computer.Screen.WorkingArea.Width - 302, 5) Case Else Me.Close() Me.Dispose() End Select What it does is pass to it now many windows are currently already opened. So if one then of course it goes to case 1. If there are 2 opened then it moves the oldest down and puts the newest on top. etc etc. I have set it so that a max of 6 boxes can only be opened at one time. If anyone knows how i could also "slide" them down (kinda like an effect of jQuery) then that would also be, well awesome to know! :o) Any help/suggestions would be great! :o) David

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• How to improve compare of item in sorted List<MyItem> with item before and after current item?

  - by Oliver

  Does anyone know about a good way to accomplish this task? Currently i'm doing it more ore less this way, but i'm feeling someway unhappy with this code, unable to say what i could immediately improve. So if anyone has a smarter way of doing this job i would be happy to know. private bool Check(List<MyItem> list) { bool result = true; //MyItem implements IComparable<MyItem> list.Sort(); for (int pos = 0; pos < list.Count - 1; pos++) { bool previousCheckOk = true; if (pos != 0) { if (!CheckCollisionWithPrevious(pos)) { MarkAsFailed(pos); result = false; previousCheckOk = false; } else { MarkAsGood(pos); } } if (previousCheckOk && pos != list.Count - 1) { if (!CheckCollisionWithFollowing(pos)) { MarkAsFailed(pos); result = false; } else { MarkAsGood(pos); } } } return result; } private bool CheckCollisionWithPrevious(int pos) { bool checkOk = false; var previousItem = _Item[pos - 1]; // Doing some checks ... return checkOk; } private bool CheckCollisionWithFollowing(int pos) { bool checkOk = false; var followingItem = _Item[pos + 1]; // Doing some checks ... return checkOk; } Update After reading the answer from Aaronaught and a little weekend to refill full mind power i came up with the following solution, that looks far better now (and nearly the same i got from Aaronaught): public bool Check(DataGridView dataGridView) { bool result = true; _Items.Sort(); for (int pos = 1; pos < _Items.Count; pos++) { var previousItem = _Items[pos - 1]; var currentItem = _Items[pos]; if (previousItem.CollidesWith(currentItem)) { dataGridView.Rows[pos].ErrorText = "Offset collides with item named " + previousItem.Label; result = false; sb.AppendLine("Line " + pos); } } dataGridView.Refresh(); return result; }

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• Solving the NP-complete problem in XKCD

  - by Adam Tuttle

  The problem/comic in question: http://xkcd.com/287/ I'm not sure this is the best way to do it, but here's what I've come up with so far. I'm using CFML, but it should be readable by anyone. <cffunction name="testCombo" returntype="boolean"> <cfargument name="currentCombo" type="string" required="true" /> <cfargument name="currentTotal" type="numeric" required="true" /> <cfargument name="apps" type="array" required="true" /> <cfset var a = 0 /> <cfset var found = false /> <cfloop from="1" to="#arrayLen(arguments.apps)#" index="a"> <cfset arguments.currentCombo = listAppend(arguments.currentCombo, arguments.apps[a].name) /> <cfset arguments.currentTotal = arguments.currentTotal + arguments.apps[a].cost /> <cfif arguments.currentTotal eq 15.05> <!--- print current combo ---> <cfoutput><strong>#arguments.currentCombo# = 15.05</strong></cfoutput><br /> <cfreturn true /> <cfelseif arguments.currentTotal gt 15.05> <cfoutput>#arguments.currentCombo# > 15.05 (aborting)</cfoutput><br /> <cfreturn false /> <cfelse> <!--- less than 15.05 ---> <cfoutput>#arguments.currentCombo# < 15.05 (traversing)</cfoutput><br /> <cfset found = testCombo(arguments.currentCombo, arguments.currentTotal, arguments.apps) /> </cfif> </cfloop> </cffunction> <cfset mf = {name="Mixed Fruit", cost=2.15} /> <cfset ff = {name="French Fries", cost=2.75} /> <cfset ss = {name="side salad", cost=3.35} /> <cfset hw = {name="hot wings", cost=3.55} /> <cfset ms = {name="moz sticks", cost=4.20} /> <cfset sp = {name="sampler plate", cost=5.80} /> <cfset apps = [ mf, ff, ss, hw, ms, sp ] /> <cfloop from="1" to="6" index="b"> <cfoutput>#testCombo(apps[b].name, apps[b].cost, apps)#</cfoutput> </cfloop> The above code tells me that the only combination that adds up to $15.05 is 7 orders of Mixed Fruit, and it takes 232 executions of my testCombo function to complete. Is there a better algorithm to come to the correct solution? Did I come to the correct solution?

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• Fulltext search for django : Mysql not so bad ? (vs sphinx, xapian)

  - by Eric

  I am studying fulltext search engines for django. It must be simple to install, fast indexing, fast index update, not blocking while indexing, fast search. After reading many web pages, I put in short list : Mysql MYISAM fulltext, djapian/python-xapian, and django-sphinx I did not choose lucene because it seems complex, nor haystack as it has less features than djapian/django-sphinx (like fields weighting). Then I made some benchmarks, to do so, I collected many free books on the net to generate a database table with 1 485 000 records (id,title,body), each record is about 600 bytes long. From the database, I also generated a list of 100 000 existing words and shuffled them to create a search list. For the tests, I made 2 runs on my laptop (4Go RAM, Dual core 2.0Ghz): the first one, just after a server reboot to clear all caches, the second is done juste after in order to test how good are cached results. Here are the "home made" benchmark results : 1485000 records with Title (150 bytes) and body (450 bytes) Mysql 5.0.75/Ubuntu 9.04 Fulltext : ========================================================================== Full indexing : 7m14.146s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:11.553524 next run : 0:00:00.168508 Mysql 5.5.4 m3/Ubuntu 9.04 Fulltext : ========================================================================== Full indexing : 6m08.154s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:11.553524 next run : 0:00:00.168508 1 thread, 100000 searchs with single word randomly taken from database : First run : 9m09s next run : 5m38s 1 thread, 10000 random strings (random strings should not be found in database) : just after the 100000 search test : 0:00:15.007353 1 thread, boolean search : 1000 x (+word1 +word2) First run : 0:00:21.205404 next run : 0:00:00.145098 Djapian Fulltext : ========================================================================== Full indexing : 84m7.601s 1 thread, 1000 searchs with single word randomly taken from database with prefetch : First run : 0:02:28.085680 next run : 0:00:14.300236 python-xapian Fulltext : ========================================================================== 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:26.402084 next run : 0:00:00.695092 django-sphinx Fulltext : ========================================================================== Full indexing : 1m25.957s 1 thread, 1000 searchs with single word randomly taken from database : First run : 0:01:30.073001 next run : 0:00:05.203294 1 thread, 100000 searchs with single word randomly taken from database : First run : 12m48s next run : 9m45s 1 thread, 10000 random strings (random strings should not be found in database) : just after the 100000 search test : 0:00:23.535319 1 thread, boolean search : 1000 x (word1 word2) First run : 0:00:20.856486 next run : 0:00:03.005416 As you can see, Mysql is not so bad at all for fulltext search. In addition, its query cache is very efficient. Mysql seems to me a good choice as there is nothing to install (I need just to write a small script to synchronize an Innodb production table to a MyISAM search table) and as I do not really need advanced search feature like stemming etc... Here is the question : What do you think about Mysql fulltext search engine vs sphinx and xapian ?

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• BindException with INTERNET permission requested

  - by Mondain

  I have seen several questions regarding SocketException when using Android, but none of them cover the BindException that I get even with the INTERNET permission specified in my manifest. Here is part of my manifest: <uses-permission android:name="android.permission.INTERNET"></uses-permission> <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"></uses-permission> <uses-permission android:name="android.permission.READ_OWNER_DATA"></uses-permission> <uses-permission android:name="android.permission.READ_PHONE_STATE"></uses-permission> <uses-permission android:name="android.permission.ACCOUNT_MANAGER"></uses-permission> <uses-permission android:name="android.permission.AUTHENTICATE_ACCOUNTS"></uses-permission> Here is the relevant portion of my LogCat output: 04-22 14:49:06.117: DEBUG/MyLibrary(4844): Address to bind: 192.168.1.14 port: 843 04-22 14:49:06.197: WARN/System.err(4844): java.net.BindException: Permission denied (maybe missing INTERNET permission) 04-22 14:49:06.207: WARN/System.err(4844): at org.apache.harmony.luni.platform.OSNetworkSystem.socketBindImpl(Native Method) 04-22 14:49:06.207: WARN/System.err(4844): at org.apache.harmony.luni.platform.OSNetworkSystem.bind(OSNetworkSystem.java:107) 04-22 14:49:06.217: WARN/System.err(4844): at org.apache.harmony.luni.net.PlainSocketImpl.bind(PlainSocketImpl.java:184) 04-22 14:49:06.217: WARN/System.err(4844): at java.net.ServerSocket.bind(ServerSocket.java:414) 04-22 14:49:06.227: WARN/System.err(4844): at org.apache.harmony.nio.internal.ServerSocketChannelImpl$ServerSocketAdapter.bind(ServerSocketChannelImpl.java:213) 04-22 14:49:06.227: WARN/System.err(4844): at java.net.ServerSocket.bind(ServerSocket.java:367) 04-22 14:49:06.237: WARN/System.err(4844): at org.apache.harmony.nio.internal.ServerSocketChannelImpl$ServerSocketAdapter.bind(ServerSocketChannelImpl.java:283) 04-22 14:49:06.237: WARN/System.err(4844): at mylibrary.net.PolicyConnection$PolicyServerWorker.(PolicyConnection.java:201) I Really hope this is a simple problem and not something complicated by the fact that the binding is occurring within a worker thread on a port less than 1024. Update Looks as if this is a privileged port issue, anyone know how to bind to ports lower than 1024 in Android? SelectorProvider provider = SelectorProvider.provider(); try { ServerSocketChannel channel = provider.openServerSocketChannel(); policySocket = channel.socket(); Log.d("MyLibrary", "Address to bind: " + device.getAddress().getAddress() + " port: 843"); InetSocketAddress addr = new InetSocketAddress(InetAddress.getByName(device.getAddress().getAddress()), 843); policySocket.bind(addr); policySocket.setReuseAddress(true); policySocket.setReceiveBufferSize(256); } catch (Exception e) { e.printStackTrace(); }

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• How to do role-based access control for a franchise business?

  - by FreshCode

  I'm building the 2nd iteration of a web-based CRM+CMS for a franchise service business in ASP.NET MVC 2. I need to control access to each franchise's services based on the roles a user is assigned for that franchise. 4 examples: Receptionist should be able to book service jobs in for her "Atlantic Seaboard" franchise, but not do any reporting. Technician should be able to alter service jobs, but not modify invoices. Managers should be able to apply discount to invoices for jobs within their stores. Owner should be able to pull reports for any franchises he owns. Where should franchise-level access control fit in between the Data - Services - Web layer? If it belongs in my Controllers, how should I best implement it? Partial Schema Roles class int ID { get; set; } // primary key for Role string Name { get; set; } Partial Franchises class short ID { get; set; } // primary key for Franchise string Slug { get; set; } // unique key for URL access, eg /{franchise}/{job} string Name { get; set; } UserRoles mapping short FranchiseID; // related to franchises table Guid UserID; // related to Users table int RoleID; // related to Roles table DateTime ValidFrom; DateTime ValidUntil; Background I built the previous CRM in classic ASP and it runs the business well, but it's time for an upgrade to speed up workflow and leave less room for error. For the sake of proper testing and better separation between data and presentation, I decided to implement the repository pattern as seen in Rob Conery's MVC Storefront series. Controller Implementation Access Control with [Authorize] attribute If there was just one franchise involved, I could simply limit access to a controller action like so: [Authorize(Roles="Receptionist, Technician, Manager, Owner")] public ActionResult CreateJob(Job job) { ... } And since franchises don't just pop up over night, perhaps this is a strong case to use the new Areas feature in ASP.NET MVC 2? Or would this lead to duplicate Views? Controllers, URL Routing & Areas Assuming Areas aren't used, what would be the best way to determine which franchise's data is being accessed? I thought of this: {franchise}/{controller}/{action}/{id} or is it better to determine a job's franchise in a Details(...) action and limit a user's action with [Authorize]: {job}/{id}/{action}/{subaction} {invoice}/{id}/{action}/{subaction} which makes more sense if any user could potentially have access to more than one franchise without cluttering the URL with a {franchise} parameter. Any input is appreciated.

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• Asp.net MVC and MOSS 2010 integration

  - by Robert Koritnik

  Just a sidenote: I'm not sure whether I should post this to serverfault as well, because some MOSS admin may have some info for me as well? A bit of explanation first (without Asp.net MVC) Is it possible to integrate the two? Is it possible to write an application that would share at least credential information with MOSS? I have to write a MOSS application that has to do with these technologies: MOSS 2010 Personal client certificates authentication (most probably on USB keys) Active Directory Federation Services Separate SQL DB that would serve application specific data (separate as not being part of MOSS DB) How should it work? Users should authenticate using personal certificates into MOSS 2010 There would be a certain part of MOSS that would be related to my custom application This application should only authorize certain users via AD FS - I guess these users should have a certain security claim attached to them This application should manage users (that have access to this app) with additional (app specific) security claims related to this application (as additional application level authorization rights for individual application parts) This application should use custom SQL 2008 DB heavily with its own data This application should have the possibility to integrate with external systems as well (Exchange for instance to inject calendar entries, ERP systems etc) This application should be able to export its data (from its DB) to files. I don't know if it's possible, but it would be nice if the app could add these files to MOSS and attach authorization info to them so only users with sufficient rights would be able to view/open these files. Why Asp.net MVC then? I'm very well versed in Asp.net MVC (also with the latest version) and I haven't done anything on Sharepoint since version 2003 (which doesn't do me no good or prepare me for the latest version in any way shape or form). This project will most probably be a death march project so I would rather write my application as a UI rich Asp.net MVC application and somehow integrate it into MOSS. But not only via a link, because I would like to at least share credentials, so users wouldn't need to re-login when accessing my app. Using Asp.net MVC I would at least have the possibility to finish on time or be less death marching. Is this at all possible? Questions Is it possible to integrate Asp.net MVC into MOSS as described above? If integration is not possible, would it be possible to create a completely MOSS based application that would work as described? Which parts of MOSS 2010 should I use to accomplish what I need?

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• Using QT to build a WYSIWYG Editor for a Custom Markup Language

  - by Aaron

  I'm new to QT, and am trying to figure out the best means of creating a WYSIWYG editor widget for a custom markup language that displays simple text, images, and links. I need to be able to propagate changes from the WYSIWYG editor to the custom markup representation. As a concrete example of the problem domain, imagine that the custom markup might have a "player" tag which contains a player name and a team name. The markup could look like this: Last week, <player id="1234"><name>Aaron Rodgers</name><team>Packers</team></player> threw a pass. This text would display in the editor as: Last week, Aaron Rodgers of the Packers threw a pass. The player name and the team name would be editable directly within the editor in standard WYSIWYG fashion, so that my users do not have to learn any markup. Also, when the player name is moused-over, a details pop-up will appear about that player, and similarly for the team. With that long introduction, I'm trying to figure out where to start with QT. It seems that the most logical option would be the Rich Text API using a QTextDocument. This approach seems less than ideal given the limitations of a QTextDocument: I can't figure out how to capture navigation events from clicking on links. Following links on click seems to only be enabled when the QTextEdit is readonly. Custom objects that implement QTextObjectInterface are ignored in copy-and-paste operations Any HTML-based markup that is passed to it as Rich Text is retranslated into a series of span tags and lots of other junk, making it extremely difficult to propagate changes from the editor back to the original custom markup. A second option appears to be QWebKit, which allows for live editing of HTML5 markup, so I could specify a two-way translation between the custom markup and HTML5. I'm not clear on how one would propagate changes from the editor back to the original markup in real-time without re-translating the entire document on every text change. The QWebKit solutions looks like awfully bulky to me (Learning WebKit along with QT) to what should be a relatively simple problem. I have also considered implementing the WYSIWYG with a custom class using native QT containers, labels, images, and other widgets manually. This seems like the most flexible approach, and the one most likely not to run into unresolvable problems. However, I'm pretty sure that implementing all the details of a normal text editor (selecting text, font changes, cut-and-paste support, undo/redo, dragging of objects, cursor placement, etc.) will be incredibly time consuming. So, finally, my question: are there any QT gurus out there with some advice on where to start with this sort of project? BTW, I am using QT because the application is a desktop application that needs platform independence.

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• Issues dismissing keyboard conditionally

  - by Chris

  I have an app that has a username and password field. I want to validate the input before the the user is allowed to stop editing the field. To do that, I'm using the textFieldShouldEndEditing delegate method. If the input doesn't validate I display a UIAlertView. This approach works as advertised - the user cannot leave the field if the input doesn't validate. To have the done button on the keyboard dismiss the keyboard, I call resignFirstResponder on the textfield. The issue I have is the alert is being called twice. How do I keep the alert from showing twice? edit for clarification What is happening is that the alert appears, then another alert appears. I then have to dismiss both windows to fix the input. Here is the textFieldShouldEndEditing method -(BOOL)textFieldShouldEndEditing:(UITextField *)textField { NSLog(@"function called %@",textField); if([textField.text length] == 0) { return YES; } if(textField == userName) { if([self userNameValidated:textField.text]) { NSLog(@"name validated"); NSString *tempDonerName = [[NSString alloc] initWithString:(@"%@",userName.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerName forKey:@"name"]; [tempDonerName release]; return YES; } else { NSLog(@"name did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Username",@"Invalid Username title") message:NSLocalizedString(@"Please make sure there are no apostrophes,spaces in the username, and that the username is less than 12 characters",@"Invalid username message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } } else if (textField == userPin) { if([self userPinValidated:textField.text]) { NSLog(@"pin validated"); //NSString *tempDonerPin = [[NSString alloc] initWithString:(@"%@",userPin.text)]; //[[NSUserDefaults standardUserDefaults] setObject:tempDonerPin forKey:@"pin"]; //[tempDonerPin release]; return YES; } else { NSLog(@"pin did not validate"); UIAlertView *alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"Invalid Password",@"Invalid Pin title") message:NSLocalizedString(@"Please make sure there are no apostrophes in the password",@"Invalid password message") delegate:nil cancelButtonTitle:NSLocalizedString(@"OK",@"OK Text") otherButtonTitles:nil]; [alert show]; [alert release]; return NO; } }else { NSLog(@"code validate - shouldn't get called"); return YES; } }

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• HTML Purifier: Removing an element conditionally based on its attributes

  - by pinkgothic

  As per the HTML Purifier smoketest, 'malformed' URIs are occasionally discarded to leave behind an attribute-less anchor tag, e.g. <a href="javascript:document.location='http://www.google.com/'">XSS</a> becomes <a>XSS</a> ...as well as occasionally being stripped down to the protocol, e.g. <a href="http://1113982867/">XSS</a> becomes <a href="http:/">XSS</a> While that's unproblematic, per se, it's a bit ugly. Instead of trying to strip these out with regular expressions, I was hoping to use HTML Purifier's own library capabilities / injectors / plug-ins / whathaveyou. Point of reference: Handling attributes Conditionally removing an attribute in HTMLPurifier is easy. Here the library offers the class HTMLPurifier_AttrTransform with the method confiscateAttr(). While I don't personally use the functionality of confiscateAttr(), I do use an HTMLPurifier_AttrTransform as per this thread to add target="_blank" to all anchors. // more configuration stuff up here $htmlDef = $htmlPurifierConfiguration->getHTMLDefinition(true); $anchor = $htmlDef->addBlankElement('a'); $anchor->attr_transform_post[] = new HTMLPurifier_AttrTransform_Target(); // purify down here HTMLPurifier_AttrTransform_Target is a very simple class, of course. class HTMLPurifier_AttrTransform_Target extends HTMLPurifier_AttrTransform { public function transform($attr, $config, $context) { // I could call $this->confiscateAttr() here to throw away an // undesired attribute $attr['target'] = '_blank'; return $attr; } } That part works like a charm, naturally. Handling elements Perhaps I'm not squinting hard enough at HTMLPurifier_TagTransform, or am looking in the wrong place(s), or generally amn't understanding it, but I can't seem to figure out a way to conditionally remove elements. Say, something to the effect of: // more configuration stuff up here $htmlDef = $htmlPurifierConfiguration->getHTMLDefinition(true); $anchor = $htmlDef->addElementHandler('a'); $anchor->elem_transform_post[] = new HTMLPurifier_ElementTransform_Cull(); // add target as per 'point of reference' here // purify down here With the Cull class extending something that has a confiscateElement() ability, or comparable, wherein I could check for a missing href attribute or a href attribute with the content http:/. HTMLPurifier_Filter I understand I could create a filter, but the examples (Youtube.php and ExtractStyleBlocks.php) suggest I'd be using regular expressions in that, which I'd really rather avoid, if it is at all possible. I'm hoping for an onboard or quasi-onboard solution that makes use of HTML Purifier's excellent parsing capabilities. Returning null in a child-class of HTMLPurifier_AttrTransform unfortunately doesn't cut it. Anyone have any smart ideas, or am I stuck with regexes? :)

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• Opera Mobile, offline web app development, and memory

  - by Jake Krohn

  I'm developing a data collection app for use on a HP iPAQ 211. I'm doing it as an offline web app (go with what you know) using Opera Mobile 9.7 and Google Gears. Being it is an offline app, it is very dependent on Javascript for much of its behavior. I'm using the LocalServer, Database, and Geolocation components of Gears, as well as the JQuery core and a couple of plugins for form validation and other usability tweaks (no jQuery UI). I've tried to be conservative with my programming style and free up or close resources whenever possible, but Opera just slowly dies after about 10-20 minutes of use. The Javascript engine stops responding, pages only half-load, and eventually stop loading completely. I'm guessing it's a resource issue. Quitting and relaunching the browser solves the problem, but only temporarily. The iPAQ ships with 128 MB of RAM, about 85-87 MB of which is available immediately after a reset. With only Opera running, there still remains about 50 MB that is left unused. My questions are thus: Is it possible to get Opera to address this unused RAM? Are there configuration settings in Opera or in the Windows Registry itself that will help improve performance? I know where to tweak, but the descriptions of the opera:config variables that I've found are less than helpful. Is is laughable to ask about memory management and jQuery in the same sentence? If not, does anyone have any suggestions? Finally, are my plans too ambitious, given the platform I have to work with? I know that Gears and Windows Mobile 6 are on their way out, but they (theoretically) suffice for what I need to do. I could ditch them in favor of an iPhone/iPod Touch, Mobile Safari, and HTML5 but I'd like to try to make this work first. I didn't think that Opera was a dog when it comes to JS performance, but perhaps it's worse than I thought. That this motley collection of technologies works at all is a minor miracle, but it needs to be faster and more stable. I appreciate any suggestions.

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• Is this asking too much of a browser?

  - by Matt Ball

  I'm embedding a large array in <script> tags in my HTML, like this (nothing surprising): <script> var largeArray = [/* lots of stuff in here */]; </script> In this particular example, the array has 210,000 elements. That's well below the theoretical maximum of 231 - by 4 orders of magnitude. Here's the fun part: if I save JS source for the array to a file, that file is 44 megabytes (46,573,399 bytes, to be exact). If you want to see for yourself, you can download it from my Dropbox. (All the data in there is canned, so much of it is repeated. This will not be the case in production.) Now, I'm really not concerned about serving that much data. My server gzips its responses, so it really doesn't take all that long to get the data over the wire. However, there is a really nasty tendency for the page, once loaded, to crash the browser. I'm not testing at all in IE (this is an internal tool). My primary targets are Chrome 8 and Firefox 3.6. In Firefox, I can see a reasonably useful error in the console: Error: script stack space quota is exhausted In Chrome, I simply get the sad-tab page: Cut to the chase, already Is this really too much data for our modern, "high-performance" browsers to handle? Is there anything I can do* to gracefully handle this much data? Incidentally, I was able to get this to work (read: not crash the tab) on-and-off in Chrome. I really thought that Chrome, at least, was made of tougher stuff, but apparently I was wrong... Edit 1 @Crayon: I wasn't looking to justify why I'd like to dump this much data into the browser at once. Short version: either I solve this one (admittedly not-that-easy) problem, or I have to solve a whole slew of other problems. I'm opting for the simpler approach for now. @various: right now, I'm not especially looking for ways to actually reduce the number of elements in the array. I know I could implement Ajax paging or what-have-you, but that introduces its own set of problems for me in other regards. @Phrogz: each element looks something like this: {dateTime:new Date(1296176400000), terminalId:'terminal999', 'General___BuildVersion':'10.05a_V110119_Beta', 'SSM___ExtId':26680, 'MD_CDMA_NETLOADER_NO_BCAST___Valid':'false', 'MD_CDMA_NETLOADER_NO_BCAST___PngAttempt':0} @Will: but I have a computer with a 4-core processor, 6 gigabytes of RAM, over half a terabyte of disk space ...and I'm not even asking for the browser to do this quickly - I'm just asking for it to work at all! ? *other than the obvious: sending less data to the browser

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• PriorityQueue update problems

  - by Bharat

  After going through a bunch of questions here on SO, I still have no idea what exactly is going wrong with my code and would appreciate some help. I'm trying to implement a priority queue based on f-costs for an A* algorithm, and while the algorithm works fine for short pathfinding distances, it seems to go wrong when there's an obstacle or when the distance between start and goal points is greater than about 30 squares (although sometimes it screws up for less too). while(!m_qOpenList.isEmpty()) { m_xCurrent=m_qOpenList.poll(); m_xCurrent.setBackground(Color.red); m_qClosedList.add(m_xCurrent); if(m_xCurrent.getStatus()==2) { System.out.println("Target Reached"); solved=true; break; } iX=m_xCurrent.getXCo(); iY=m_xCurrent.getYCo(); for(i=iX-1;i<=iX+1;i++) for(j=iY-1;j<=iY+1;j++) { if(i<0||j<0||i>m_iMazeX||j>m_iMazeX||(i==iX&&j==iY) || m_xNode[i][j].getStatus()==4|| m_qClosedList.contains(m_xNode[i][j])) continue; m_xNode[i][j].score(m_xCurrent,m_xGoal); m_qOpenList.add(m_xNode[i][j]); } } It's quite rudimentary as I'm just trying to get it to work for now. m_qOpenList is the PriorityQueue. The problem is that when I debug the program, at some point (near an obstacle), a Node with a fcost of say 84 has higher priority than a node with an fcost of 70. I am not attempting to modify the values once they're on the priority queue. You'll notice that I add at the end of the while loop (I read somewhere that the priorityqueue reorders itself when stuff is added to it), and poll right after that at the beginning. Status of 2 means the Node is the goal, and a status of 4 means that it is unwalkable. public int compareTo(Node o) { if(m_iF<o.m_iF) return -1; if(m_iF>o.m_iF) return 1; return 0; } And that's the compareTo function. Can you see a problem? =(

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• css table column width not set

  - by bsreekanth

  Hello, I'm trying to set the width of table column to a minimum value. The header row (th) was set white-space:nowrap to prevent wrapping. Now all the columns (including td rows) set to a width that of th. I tried to expand the size of smaller columns by setting it in the html as <th style="width:200px;"> and <td style="width:200px;">, but it has no effect. In firebug, in the style section, the width setting is active element.style { width:200px; } Still, the computed tab shows the width is less than 200px. Please see the details below. th -- computed: Text font-family verdana,arial,helvetica,sans-serif font-size 10px font-weight bold font-style normal color #333333 text-transform none text-decoration none letter-spacing normal word-spacing 0 line-height 17px text-align left vertical-align baseline direction ltr Background background-color transparent background-image none background-repeat repeat background-position 0 0 background-attachment scroll opacity 1 Box Model width 152px height 17px top auto right auto bottom auto left auto margin-top 0 margin-right 0 margin-bottom 0 margin-left 0 padding-top 0 padding-right 0 padding-bottom 0 padding-left 0 border-top-width 0 border-right-width 0 border-bottom-width 0 border-left-width 0 border-top-color #333333 border-right-color #333333 border-bottom-color #333333 border-left-color #333333 border-top-style none border-right-style none border-bottom-style none border-left-style none Layout position static display block visibility visible z-index auto overflow-x visible overflow-y visible white-space nowrap clip auto float none clear none -moz-box-sizing content-box Other cursor pointer list-style-image none list-style-position outside list-style-type disc marker-offset auto and td --computed: Text font-family verdana,arial,helvetica,sans-serif font-size 11px font-weight 400 font-style normal color #222222 text-transform none text-decoration none letter-spacing normal word-spacing 0 line-height 12px text-align left vertical-align top direction ltr Background background-color transparent background-image none background-repeat repeat background-position 0 0 background-attachment scroll opacity 1 Box Model width 152px height 48px top auto right auto bottom auto left auto margin-top 0 margin-right 0 margin-bottom 0 margin-left 0 padding-top 5px padding-right 6px padding-bottom 5px padding-left 6px border-top-width 0 border-right-width 1px border-bottom-width 0 border-left-width 0 border-top-color #222222 border-right-color #222222 border-bottom-color #222222 border-left-color #DDDDDD border-top-style none border-right-style none border-bottom-style none border-left-style solid Layout position static display table-cell visibility visible z-index auto overflow-x visible overflow-y visible white-space normal clip auto float none clear none -moz-box-sizing content-box Other cursor auto list-style-image none list-style-position outside list-style-type disc marker-offset auto Any help, highly appreciated... thanks

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• Wiki-fying a text using LPeg

  - by Stigma

  Long story coming up, but I'll try to keep it brief. I have many pure-text paragraphs which I extract from a system and re-output in wiki format so that the copying of said data is not such an arduous task. This all goes really well, except that there are no automatic references being generated for the 'topics' we have pages for, which end up needing to be added by reading through all the text and adding it in manually by changing Topic to [[Topic]]. First requirement: each topic is only to be made clickable once, which is the first occurrence. Otherwise, it would become a really spammy linkfest, which would detract from readability. To avoid issues with topics that start with the same words Second requirement: overlapping topic names should be handled in such a way that the most 'precise' topic gets the link, and in later occurrences, the less precise topics do not get linked, since they're likely not correct. Example: topics = { "Project", "Mary", "Mr. Moore", "Project Omega"} input = "Mary and Mr. Moore work together on Project Omega. Mr. Moore hates both Mary and Project Omega, but Mary simply loves the Project." output = function_to_be_written(input) -- "[[Mary]] and [[Mr. Moore]] work together on [[Project Omega]]. Mr. Moore hates both Mary and Project Omega, but Mary simply loves the [[Project]]." Now, I quickly figured out a simple or complicated string.gsub() could not get me what I need to satisfy the second requirement, as it provides no way to say 'Consider this match as if it did not happen - I want you to backtrack further'. I need the engine to do something akin to: input = "abc def ghi" -- Looping over the input would, in this order, match the following strings: -- 1) abc def ghi -- 2) abc def -- 3) abc -- 4) def ghi -- 5) def -- 6) ghi Once a string matches an actual topic and has not been replaced before by its wikified version, it is replaced. If this topic has been replaced by a wikified version before, don't replace, but simply continue the matching at the end of the topic. (So for a topic "abc def", it would test "ghi" next in both cases.) Thus I arrive at LPeg. I have read up on it, played with it, but it is considerably complex, and while I think I need to use lpeg.Cmt and lpeg.Cs somehow, I am unable to mix the two properly to make what I want to do work. I am refraining from posting my practice attempts as they are of miserable quality and probably more likely to confuse anyone than assist in clarifying my problem. (Why do I want to use a PEG instead of writing a triple-nested loop myself? Because I don't want to, and it is a great excuse to learn PEGs.. except that I am in over my head a bit. Unless it is not possible with LPeg, the first is not an option.)

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• How would you organize a large complex web application (see basic example)?

  - by Anurag

  How do you usually organize complex web applications that are extremely rich on the client side. I have created a contrived example to indicate the kind of mess it's easy to get into if things are not managed well for big apps. Feel free to modify/extend this example as you wish - http://jsfiddle.net/NHyLC/1/ The example basically mirrors part of the comment posting on SO, and follows the following rules: Must have 15 characters minimum, after multiple spaces are trimmed out to one. If Add Comment is clicked, but the size is less than 15 after removing multiple spaces, then show a popup with the error. Indicate amount of characters remaining and summarize with color coding. Gray indicates a small comment, brown indicates a medium comment, orange a large comment, and red a comment overflow. One comment can only be submitted every 15 seconds. If comment is submitted too soon, show a popup with appropriate error message. A couple of issues I noticed with this example. This should ideally be a widget or some sort of packaged functionality. Things like a comment per 15 seconds, and minimum 15 character comment belong to some application wide policies rather than being embedded inside each widget. Too many hard-coded values. No code organization. Model, Views, Controllers are all bundled together. Not that MVC is the only approach for organizing rich client side web applications, but there is none in this example. How would you go about cleaning this up? Applying a little MVC/MVP along the way? Here's some of the relevant functions, but it will make more sense if you saw the entire code on jsfiddle: /** * Handle comment change. * Update character count. * Indicate progress */ function handleCommentUpdate(comment) { var status = $('.comment-status'); status.text(getStatusText(comment)); status.removeClass('mild spicy hot sizzling'); status.addClass(getStatusClass(comment)); } /** * Is the comment valid for submission */ function commentSubmittable(comment) { var notTooSoon = !isTooSoon(); var notEmpty = !isEmpty(comment); var hasEnoughCharacters = !isTooShort(comment); return notTooSoon && notEmpty && hasEnoughCharacters; } // submit comment $('.add-comment').click(function() { var comment = $('.comment-box').val(); // submit comment, fake ajax call if(commentSubmittable(comment)) { .. } // show a popup if comment is mostly spaces if(isTooShort(comment)) { if(comment.length < 15) { // blink status message } else { popup("Comment must be at least 15 characters in length."); } } // show a popup is comment submitted too soon else if(isTooSoon()) { popup("Only 1 comment allowed per 15 seconds."); } });

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• Using in app purchase to unlock features vs. using free & paid app versions for iPhone

  - by yabada

  I have an app that I was going to release as a free (lite) version with some of the total functionality and a paid full version with advanced functionality. Now, with in app purchase for free apps I am thinking of going that route with the ability to unlock features as needed. I'm not talking about a trial version that expires.I want people to be able to try out the app and get an idea of the interface and functionality before deciding to purchase the full functionality of each major section of the app, basically. Here's an analogy of what my app would be like. Let's say you have a cooking app that teaches you to cook in different styles. There could be major section for French, Italian, and Chinese. Each section could have some rudiments unlocked in the free app so users can see the UI and basics of the functionality. Then, the user could decide to purchase each major section (or not) individually with in app purchase or buy the full versioned app (with the free/paid model). One concern I have with offering a free app with in app purchase would be with feedback. I would be very clear in my description in the app store that there is in app purchase for full features but I'm worried that less serious users could/would leave negative feedback. I suppose that's always a risk but curious about any experience with this. It also seems that it could be a whole lot more complicated keeping track of what portions of the app are locked and unlocked with in app purchase. I know I'd have to have all the code for the full functionality and "lock" the portions that haven't been purchased. How do people usually lock portions of their code? I'm not talking about the process of purchasing (I've read the In App Purchase Programming Guide) but after the purchase has been made. Would I just keep track of what the user has purchased and put conditionals on the sections that are initially locked? Or is there another way to do this as well? My instinct is for the in app purchase (particularly since users could purchase the major sections that they want individually).

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• PyQt threads and signals - how to properly retrieve values

  - by Cawas

  Using Python 2.5 and PyQt, I couldn't find any question this specific in Python, so sorry if I'm repeating the other Qt referenced questions below, but I couldn't easily understand that C code. I've got two classes, a GUI and a thread, and I'm trying to get return values from the thread. I've used the link in here as base to write my code, which is working just fine. To sum it up and illustrate the question in code here (I don't think this code will run on itself): class MainWindow (QtGui.QWidget): # this is just a reference and not really relevant to the question def __init__ (self, parent = None): QtGui.QWidget.__init__(self, parent) self.thread = Worker() # this does not begin a thread - look at "Worker.run" for mor details self.connect(self.thread, QtCore.SIGNAL('finished()'), self.unfreezeUi) self.connect(self.thread, QtCore.SIGNAL('terminated()'), self.unfreezeUi) self.connect(self.buttonDaemon, QtCore.SIGNAL('clicked()'), self.pressDaemon) # the problem begins below: I'm not using signals, or queue, or whatever, while I believe I should def pressDaemon (self): self.buttonDaemon.setEnabled(False) if self.thread.isDaemonRunning(): self.thread.setDaemonStopSignal(True) self.buttonDaemon.setText('Daemon - converts every %s sec'% args['daemonInterval']) else: self.buttonConvert.setEnabled(False) self.thread.startDaemon() self.buttonDaemon.setText('Stop Daemon') self.buttonDaemon.setEnabled(True) # this whole class is just another reference class Worker (QtCore.QThread): daemonIsRunning = False daemonStopSignal = False daemonCurrentDelay = 0 def isDaemonRunning (self): return self.daemonIsRunning def setDaemonStopSignal (self, bool): self.daemonStopSignal = bool def __init__ (self, parent = None): QtCore.QThread.__init__(self, parent) self.exiting = False self.thread_to_run = None # which def will be running def __del__ (self): self.exiting = True self.thread_to_run = None self.wait() def run (self): if self.thread_to_run != None: self.thread_to_run(mode='continue') def startDaemon (self, mode = 'run'): if mode == 'run': self.thread_to_run = self.startDaemon # I'd love to be able to just pass this as an argument on start() below return self.start() # this will begin the thread # this is where the thread actually begins self.daemonIsRunning = True self.daemonStopSignal = False sleepStep = 0.1 # don't know how to interrupt while sleeping - so the less sleepStep, the faster StopSignal will work # begins the daemon in an "infinite" loop while self.daemonStopSignal == False and not self.exiting: # here, do any kind of daemon service delay = 0 while self.daemonStopSignal == False and not self.exiting and delay < args['daemonInterval']: time.sleep(sleepStep) # delay is actually set by while, but this holds for N second delay += sleepStep # daemon stopped, reseting everything self.daemonIsRunning = False self.emit(QtCore.SIGNAL('terminated')) Tho it's quite big, I hope this is pretty clear. The main point is on def pressDaemon. Specifically all 3 self.thread calls. The last one, self.thread.startDaemon() is just fine, and exactly as the example. I doubt that represents any issue. The problem is being able to set the Daemon Stop Signal and retrieve the value if it's running. I'm not sure that it's possible to set a stop signal on QtCore.QtThread, because I've tried doing the same way and it didn't work. But I'm pretty sure it's not possible to retrieve a return result from the emit. So, there it is. I'm using direct calls to the thread class, and I'm almost positive that's not a good design and will probably fail when running under stress. I read about that queue, but I'm not sure it's the proper solution here, or if I should be using Qt at all, since this is Python. And just maybe there's nothing wrong with the way I'm doing.

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• Java Nimbus LAF with transparent text fields

  - by Software Monkey

  I have an application that uses disabled JTextFields in several places which are intended to be transparent - allowing the background to show through instead of the text field's normal background. When running the new Nimbus LAF these fields are opaque (despite setting setOpaque(false)), and my UI is broken. It's as if the LAF is ignoring the opaque property. Setting a background color explicitly is both difficult in several places, and less than optimal due to background images actually doesn't work - it still paints it's LAF default background over the top, leaving a border-like appearance (the splash screen below has the background explicitly set to match the image). Any ideas on how I can get Nimbus to not paint the background for a JTextField? Note: I need a JTextField, rather than a JLabel, because I need the thread-safe setText(), and wrapping capability. Note: My fallback position is to continue using the system LAF, but Nimbus does look substantially better. See example images below. Conclusions The surprise at this behavior is due to a misinterpretation of what setOpaque() is meant to do - from the Nimbus bug report: This is a problem the the orginal design of Swing and how it has been confusing for years. The issue is setOpaque(false) has had a side effect in exiting LAFs which is that of hiding the background which is not really what it is ment for. It is ment to say that the component my have transparent parts and swing should paint the parent component behind it. It's unfortunate that the Nimbus components also appear not to honor setBackground(null) which would otherwise be the recommended way to stop the background painting. Setting a fully transparent background seems unintuitive to me. In my opinion, setOpaque()/isOpaque() is a faulty public API choice which should have been only: public boolean isFullyOpaque(); I say this, because isOpaque()==true is a contract with Swing that the component subclass will take responsibility for painting it's entire background - which means the parent can skip painting that region if it wants (which is an important performance enhancement). Something external cannot directly change this contract (legitimately), whose fulfillment may be coded into the component. So the opacity of the component should not have been settable using setOpaque(). Instead something like setBackground(null) should cause many components to "no long have a background" and therefore become not fully opaque. By way of example, in an ideal world most components should have an isOpaque() that looks like this: public boolean isOpaque() { return (background!=null); }

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• Which StackOverflow-style MarkDown (WMD) javascript editor should I use?

  - by Edan Maor

  Background I'm working on an application which requires user-entered content, and I've decided to use a StackOverflow-style MarkDown editor. After researching this topic for the last few days, I realize there are numerous forks of the base WMD editor, some with a few basic enhancements and some with serious differences from the StackOverflow one. Since this will be the heart of the application, I'd like to start with the best code base I can. I'd be happy if anyone can recommend which one of the many solutions out there best fits my needs. Below is requirements, plus what I've managed to find already. I'm hoping this question will help me decide which version to go with, and maybe help me discover a port out there that's an even better fit for my needs. The requirements for my project Live Preview Multiple editors on the same page (not know how many in advance, since the user can dynamically add another editing box). Ability to extend with extra buttons (I'd like a button to upload a picture, instead of just adding an img url). Ability to dynamically show/hide the edit box (and only see the preview box). Not an absolute must, but I'd prefer to stick as close to StackOverflow's look and feel, since it's well known. Don't know if this matters, but the backend is written in Django. Editors I've looked at Here are a few of the code bases I've looked at, with thoughts. Obviously, I might be missing another solution out there. The derobins version. From what I can tell, this is the official StackOverflow version. Seems like it doesn't support multiple editors on one page. JQuery.MarkEdit. Looks very good, but is pretty different from the StackOverflow version. MooWMD. Looks like the winner right now, but I'm a little concerned since it looks less active/hackable than MarkEdit. The wmd-new version. Not sure, looks like an old codebase without much use. The SocialSite branch. Seems like it's not for public use.

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• How to make efficient code emerge through unit testing

  - by Jean

  Hi, I participate in a TDD Coding Dojo, where we try to practice pure TDD on simple problems. It occured to me however that the code which emerges from the unit tests isn't the most efficient. Now this is fine most of the time, but what if the code usage grows so that efficiency becomes a problem. I love the way the code emerges from unit testing, but is it possible to make the efficiency property emerge through further tests ? Here is a trivial example in ruby: prime factorization. I followed a pure TDD approach making the tests pass one after the other validating my original acceptance test (commented at the bottom). What further steps could I take, if I wanted to make one of the generic prime factorization algorithms emerge ? To reduce the problem domain, let's say I want to get a quadratic sieve implementation ... Now in this precise case I know the "optimal algorithm, but in most cases, the client will simply add a requirement that the feature runs in less than "x" time for a given environment. require 'shoulda' require 'lib/prime' class MathTest < Test::Unit::TestCase context "The math module" do should "have a method to get primes" do assert Math.respond_to? 'primes' end end context "The primes method of Math" do should "return [] for 0" do assert_equal [], Math.primes(0) end should "return [1] for 1 " do assert_equal [1], Math.primes(1) end should "return [1,2] for 2" do assert_equal [1,2], Math.primes(2) end should "return [1,3] for 3" do assert_equal [1,3], Math.primes(3) end should "return [1,2] for 4" do assert_equal [1,2,2], Math.primes(4) end should "return [1,5] for 5" do assert_equal [1,5], Math.primes(5) end should "return [1,2,3] for 6" do assert_equal [1,2,3], Math.primes(6) end should "return [1,3] for 9" do assert_equal [1,3,3], Math.primes(9) end should "return [1,2,5] for 10" do assert_equal [1,2,5], Math.primes(10) end end # context "Functionnal Acceptance test 1" do # context "the prime factors of 14101980 are 1,2,2,3,5,61,3853"do # should "return [1,2,3,5,61,3853] for ${14101980*14101980}" do # assert_equal [1,2,2,3,5,61,3853], Math.primes(14101980*14101980) # end # end # end end and the naive algorithm I created by this approach module Math def self.primes(n) if n==0 return [] else primes=[1] for i in 2..n do if n%i==0 while(n%i==0) primes<<i n=n/i end end end primes end end end

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