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• How do I know if a drag/drop has been cancelled in WPF

  - by Jon Mitchell

  I'm writing a user control in WPF which is based on a ListBox. One of the main pieces of functionality is the ability to reorder the list by dragging the items around. When a user drags an item I change the items Opacity to 50% and physically move the item in an ObservableCollection in my ViewModel depending on where the user wants it. On the drop event I change the Opacity back to 100%. The problem I've got is that if the user drags the item off my control and drops it somewhere else then I need to change the Opacity back to 100% and move the item back to where it was when the user started the drag. Is there an event I can handle to capture this action? If not is there any other cunning way to solve this problem?

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• How to mute an audio stream

  - by gabac

  Hi there Is there way to mute an audio stream or at least control the volume? cheers

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• Syntax Highlighting in a ListBox

  - by ph0enix

  Hi all, I've searched the web and I can't seem to find anything that will work for me. I've seen plenty of discussion, and even some fairly extensible open-source tools, for code editors that provide line numbers and syntax highlighting. Here's my dilemma... I'm working on a "digital code review" project in C#.NET that allows users to specify source files, add them to a particular session, and other users can make comments and line references to the files being reviewed. Basic requirements: Must be written in C#.NET I don't need to be able to edit the text in the text box Users need to be able to select a line (or multiple lines), to make line references. It seems to me that I need some fancy implementation of a ListBox control (not a drop-down list) that has some OwnerDraw capabilities to add line numbers and syntax highlighting. Unfortunately, I haven't had any luck putting it together myself, and I can't seem to find a control that's already been written or a reference on how I might be able to accomplish this. Any suggestions??

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• jquery best controls that generated tree

  - by mazhar

  ok can someone tell me the best tree view control in jquery? apart from dynatree

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• Threading Problems in ActionScript 2.0?

  - by yar

  Is it possible to have concurrency problems (thread competition) in an onEnterFrame method in ActionScript 2.0? I have written this cheesy code as a guard: if (!busy) { // I suspect some threading problems: is that even possible in flash busy = true; movePanels(); busy = false; } but this is no assurance against thread competition. If so, how can I do a basic semaphore/lock? Note: I suspect threading problems in my app, but if they're impossible, I'll check my code differently.

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• Tips for measuring the parallelism speed-up in multi-core development.

  - by fnCzar

  I have read many of the good questions and answers around multi-core programming how-tos etc. I am familiar with concurrency, IPC, MPI etc but what I need is advice on how to measure speed-up which will help in making a business case of spending the time to write such code. Please don't answer with "well run it with single-core code then multi-core code and figure out the difference". This is neither a scientific nor a reliable way to measure performance improvement. If you know of tools that will do some of the heavy lifting please mention them. Answers pertaining to methodology will be more fitting but listing tools is ok as well.

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• Flex custom toggleswitch not working in actionscript

  - by Gavin Jones

  I have a custom Flex Toggleswitch component that changes the text values of the switch. package skins { import spark.skins.mobile.ToggleSwitchSkin; public class MyToggleSwitchSkin extends ToggleSwitchSkin { public function MyToggleSwitchSkin() { super(); selectedLabel="Serviceable"; unselectedLabel="Fault"; } } } If I add the control using the MXML tag, it works fine. However, when I add the component using action script, it does not. import skins.MyToggleSwitchSkin; public function addToggle():void { var myCustomToggle:MyToggleSwitchSkin = new MyToggleSwitchSkin(); hgroup.addElement(myCustomToggle); } The control dsiplays but will not activate. Any ideas what I have missed?

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• Windows Mobile 6.5 flick (scrolling with inertia) not working

  - by GRR

  After upgrading to windows mobile 6.5, my ListView control does not work properly with custom items (rows with alternate colors) and the new gesture mechanism... On a mobile device, if the user initiates a flick or pan, after scrolling the first few items, the last items are not shown on the screen, but will show up if the user explicitly taps on them -- so basically the last screen is just white. The WM_DRAWITEM message is sent to all children though, but they just don't show up on the screen. Scrolling with a bar works fine. Any ideas? I have seen some reports of similar behavior from other users, but not sure if this is a bug in the listview control itself or if there is something else that needs to/can be implemented to support flick and pan actions. The application code currently doesn't handle WM_GESTURE messages, so the flick action is done with Microsoft's own code to support legacy applications. Thanks!

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• Is MS Access still the most efficient RAD tool for small-scale custom apps?

  - by FastAl

  Of the many other development tools I've used, nothing holds a candle to the 'Functionality to Development Effort' ratio of MS Access. The reason I am asking is that I have been out of the language selection process for a few years, working on a large .Net system, and am only anecdotally familiar with the latest development tools outside the .Net world. I'm well aware of the limitations of Access, but for a limited concurrency (usually only 1 user at a time), small business, custom app, has anybody found a comparable end-to-end solution or combination that comes close? It doesn't have to be free, open source, or even Windows based. It just has to allow the same speed of development and maintenance, and maybe even provide some additional amenities like seamless autointegration with a server-based DB Engine (like Access does with its own 'Jet' dbms), better web support, and a file format more compatible with source control. I don't want to miss out on anything. Please share your development experience with your suggestions. Thanks.

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• Arguments against Create or Update

  - by Nix

  Recently someone stated that they thought all Creates should be CreateOrUpdates. Instinctively i thought bad, but now I am trying to find out if I have any grounds. Situation interface IService{ void Create(Object a); void Update(Object a); } or interface IService{ void CreateOrUpdate(Object a); } My first thought is if you implemented everything CreateOrUpdate then you have no control if someone accidentally sends you wrong data, or concurrency issues where someone changes a "primary" field right before you call update.... But if you remove those cases, are there any other cons?

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• Is Microsoft CCR gaining any traction?

  - by spender

  Microsoft's Concurrency and Coordination Runtime quite literally saved a project that was running into major issues with deadlocking. Since then I find that I use it more and more frequently for almost anything that requires asynchronous coding producing results that run lighter and faster than before. I can honestly state that it has transformed the way I think about multithread/multicore dev. Despite my personal love for CCR, there appears to be very little buzz surrounding it on the web and was wondering if anyone can offer any reason for this. Are there better alternatives, or is it a lack of promotion from MS, or are people simply happy with the existing tools?

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• Using svn remove - preserve file on disk instead of having it deleted?

  - by user246114

  Hi, I am creating an eclipse project, which generates a lot of files I don't want to keep under version control. For example, it creates a project folder like: project/ bin/ horse.class cow.class src/ horse.java cow.java so what I do is add the project folder to svn, like: svn add project this puts everything under control, even the bin and .class files. All of those files will have the little 'a' next to them. How can I simply remove the 'add' status from those files? If I try: svn remove bin/horse.class I have to use the --force option and it deletes the file from disk. Is there a way to simply remove it from source but not delete the file from disk? Thanks

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• Flex: DateField how to get the value?

  - by Yevgeny

  I' m trying to use the DateField control. I can set the current value using the selectedDate field. Adobe says: "Selecting the currently selected date in the control deselects it, sets the selectedDate property to null", so when user selects other date the selectedDate = null. How do I can get the current selected value? I only saw in the debugger that DateField's text property contains the string with selected date? Do I need to parse it back? 10x in advance yevgeny

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• load balancer question c# asp.net

  - by Migs

  The place where I work has 2 servers and a load balancer. The setup is horrible since I have to manually make sure both servers have the same files. I know there are ways to automate this but it has not been implemented, hopefully soon (I have no control over this). I wrote an application that collects a bunch of information from a user, then creates a folder named after the email of the user in one of the servers. The problem is that I can't control in which server the folder gets created in, so let say a user goes in.. fills his stuff and his folder gets created in server 1, user goes away for a while and goes back to the site but this time the load balancer throws the user into server 2, now the user does something that needs to be saved into his folder but since it didn't created in this server an error occurs. What can I do about this? any suggestions? Thanks

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• C# - Keep track of open child forms

  - by Nate Shoffner

  I currently have a parent control (Form1) and a child control (Form2). Form1 contains a listview that stores a list of of file data (each file is a separate item). Form2 contains only a textbox. Upon clicking on one of these listviewitems in Form1, Form2 is opened up and accesses the file's data and loads it into the textbox in Form2 in plain text format. The issue I'm having is, I would like to be able to detect, upon clicking of a listviewitem, whether that file is already opened in said child form and if so, to activate it (bring it to the front) and if it is not already opened, open it. I'm not sure what the best method of doing this would be since this can involve many child forms being open at once. This is not an MDI application. Any ideas on how this could be accomplished are appreciated and samples even more so. Thank you.

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• How to keep track for window form crashing ?

  - by Harikrishna

  I am using windows form application. There is one tiny window form which is on the main form and goes step by step for some control to indicates the functionality of each control like a tutorial.So user can understand the application. Now I want to keep track of that tiny window form like at which step user canceled it. So I can do it by writing code in the event of button cancel event of that tiny window form. But that form sometimes goes to crashed, so I want to keep track of that also, So how can I do that ?

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• How to get the url of the page which is currently loading i the iframe

  - by Gayathri

  Hi, I have an requirement that, in my application on clicking an button i have to laod one more application with the same template which i was using for my application. So, on clicking the button in my application i have used one intermediate page in that using iframe i passed that URL of an external application. Its working fine. But the problem is in the external applicatio which is not in my control on clicking an button it is moving to next page. In that page i want to hide an button. I did that also using div tag color as white and set the positions. But the problem is in all the pages in the same position that is affecting. So i want to get the url of the page which is loading in the iframe on the second or third click of an external application, so that i can using some conditions i can hide the control. So please any one help me to get the solution for this problem

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• WPF UserControl event called only once?

  - by 742

  Hi Everyone, I need to bind two-way a property of a user control to a property of a containing user control. I also need to set a default value to the property from code in the child (cannot be done easily from XAML tags). If I call my code from the child constructor, the value is set in the parent but the change callback routine is not triggered (my understanding is that the parent doesn't yet exist at the time the child is created). My current workaround is to catch the Loaded event of the child and to call the code from the handler. Howver as Loaded is called more than once, I need to set a flag to set the property only the first time. I don't like this way, but I don't know if there is a single shot event that could be used, or if this can be done otherwise. Any feedback based on your experience?

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• Writing Ruby Libraries - hiding methods from outside the module

  - by JP

  Hi all, I'm writing a Ruby library which has a module with a bunch of classes inside it. Many of these classes need to be usable and modifiable by calling scripts, but I don't want (some of) the initializers to be visible/callable: module MyLib class Control def initialize # They can use this end def do_stuff Helper.new('things') end end class Helper # Shouldn't be visible def initialize(what) @what = what end def shout @what end end end c = MyLib::Control.new h = c.do_stuff p h.shout # => "things" # ^ All of this is desired # v This is undesirable p MyLib::Helper.new('!') # => <MyLib::Helper @what='!'> If it's a simple thing, then I'd also appreciate the generated RDoc not even include the .new method for the Helper class either. Any ideas? Thanks for reading!

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• Java Disabled JLabel Reports Mouse Clicked

  - by ikurtz

  colLabels[i].addMouseListener(new MyAdapter()); private class MyAdapter extends MouseAdapter { @Override public void mouseClicked(MouseEvent event) { ColJLabel colJLabel = (ColJLabel)event.getComponent(); System.out.println(colJLabel.ColID); setColumnHeader(false); } } colLabels[i].setEnabled(flag); The situation is this: Mouse clicks are trapped correctly but when i have the JLabel (ColJLabel) control disabled it still reports mouse clicks. How can I make so that mouse clicks are only reported when the control is enabled? Thanks.

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• How can I notify an application of a programmatically set scrollbar value?

  - by Frerich Raabe

  My code involves standard Scroll Bar control and it happens that I need to change its value programmatically in some cases. I do this using SetScrollInfo function, as in this example: void setScrollBarValue( HWND scrollBar, int value ) { SCROLLINFO si = { sizeof( SCROLLINFO ); } si.fMask = SIF_POS; si.nPos = value; ::SetScrollInfo( scrollBar, SB_CTL, &si, true /* redraw */ ); } This appears to work fine (the thumb of the scrollbar moves around) but it fails to notify the rest of the application of the new scrollbar value. For instance, an edit control which uses the scroll bar (much like in the Windows notepad application) fails to scroll around because it doesn't get notified about the new scrollbar value. In case it matters: the scrollbar I'm modifying is not in the same process as the above setScrollBarValue function. Does anybody know how to achieve this?

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• How do I register a Javascript function to run with every postback?

  - by Kevin

  I have a treeview in a user control. I need to run a javascript function with every synch postback to scroll the div it's in to the right position. I've got it working, but I think there has to be a "cleaner" way to do it. In the Page_Load function of the control, I have the following code. Is there a better way to do it? ScriptManager.RegisterStartupScript(this.UpdatePanel1, this.GetType(), "key" + DateTime.Now.Ticks, "RestorePosition();", true);

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• Is there a way to have one project build another in Visual Studio?

  - by Martin Neal

  We are finally getting a source control system in place at work and I've been in charge of setting it up. I've read that it's usually good practice to not include binaries in source control so I haven't. However, we have two all-purpose utility projects (each in their own solution) that generate utility .dll's which are included in almost all of our other projects (all each in their own separate solutions). We add references to the utility dll from our projects. I would like to have our solutions set up in such a way that if the reference dll isn't built, the solution will build the dll for itself, much in the same way a make file checks for its dependencies and builds them when they're out of date or missing. I'm new to build processes with VS so try to keep the answers simple. Any links to general build process overview tutorials would be great too. Googleing for VS references returns a bunch of how-to add references links which is not exactly what I want.

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• Using CSS to positon text after an image

  - by Charles L

  I've trying to do something that I'm sure is simple, but I can't do it. All I want to do is have an image and then some text after that image, and be able to control accurately the amount of space between the image and the text. Here's my code: http://pastebin.com/fx17XUaR I couldn't work out how to paste it in here directly. In my style sheet, wrap has these attributes: .wrap { //text-align: left; width: 1100px; height: 870px; background-color: white; color: black; padding: 10px; margin: auto; I want my text to look like this directly below the image: Username Age Location Currently, I just add loads of break tags to control where I have the text, but that's messy and there must be a better way. Thanks in advance for any help.

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• Animate a e.Graphics.DrawLine with arrowhead

  - by Fer

  I need to "animate" an arrow. It can go in any direction (up, down, left, right and diagonals) and the arrowhead will be at the end. It needs to appear as if it is growing from orgin to the end. To make matters more complicated it has to be in a user control so it is possible to add to the controls collection in the forms and remove it to delete it from the screen, and its background is really transparent (no color.transparent) so i can't paint the background to "clear" the previous line. I have it static already (drawn from origin to end) but i can't animate it. I tried to add a timer in the user control but I fail to get a correct algorithm to calculate the intermediate ends of the line while it is growing. Any help would be appreciated. Thanks

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