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• In MVVM are DataTemplates considered Views as UserControls are Views?

  - by Edward Tanguay

  In MVVM, every View has a ViewModel. A View I understand to be a Window, Page or UserControl to which you can attach a ViewModel from which the view gets its data. But a DataTemplate can also render a ViewModel's data. So I understand a DataTemplate to be another "View", but there seem to be differences, e.g. Windows, Pages, and UserControls can define their own .dlls, one type is bound with DataContect the other through attaching a template so that Windows, Pages, UserControls can can be attached to ViewModels dynamically by a ServiceLocator/Container, etc. How else are DataTemplates different than Windows/Pages/UserControls when it comes to rendering a ViewModel's data on the UI? And are there other types of "Views" other than these four?

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• How to manage toolbars with mvvm and WPF

  - by Michael Stoll

  I'm looking for a smooth method of managing toolbars (and menus) with mvvm in WPF. Consider an UI with tabbed workspaces and heterogenous content (like Visual Studio). There the toolbars should be hidden or visible depending on the active tab. How would you design the view viewmodel for the toolbars? I'd use a collection of toolbar-viewmodels and bind the ToolbarTray to it, but afaik that's not possible. Any recommendations are apreciated. Links to samples, best practice papers, etc. are welcome.

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• CURL alternative - Design ideas

  - by Vincent

  All, I am looking for some web application design ideas here. I have a server X that hosts an SDK, which has the capacity to talk a piece of hardware. When I make an HTTPS request from an external PHP web application (hosted on Server Y) to Server X through curl, Server X gives JSON data as a response. I use this data to render my UI for the web app on Server Y. The above method seems to be slow and has a tendency to fail in production if there are too many concurrent requests. Can anybody let me know if there is an alternative to CURL or any other design people are using to pull data like this from servers? Thanks

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• Combining features from other projects in an ASP.NET MVC application

  - by Katie D

  Hello, I am writing an ASP.NET MVC application that combines a set of features from existing applications. The new application is suppose to use UI features and logic created (especially for this purpose) in the existing applications. For that reason I wanted to create in the existing applications some kind of a "blackbox" that I will be able to drop in my new application along with a matching connection string, and it will work independently, binding data on it's own. I thought about using partial views, but I am having trouble with passing the model data to it, since the controller of the new application should not know about the model of the existing applications. I can not use ASP.NET WebForms, since my application should be a "postback-less" application, and ASP.NET AJAX toolkit or frameworks alike are out of the question. Any help would be greatly appreciated. Thank you, Katie

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• Your Django Development process/steps (Step by Step)

  - by AJ

  I want to know step by step process of how folks develop on Django here. I have seen that whenever I try to create a website in Django, I always get confused amongst: DB Schema/models.py UI/Template Structure Login module urls.py views.py How do you approach this? I may have missed something. You do not need to elaborate everything, just stepwise what you do. If you do two things at the same time (or side-by-side), that would also be helpful to mention. Thanks a lot.

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• Set a js variable in a html include

  - by user102533

  I have a ASP.NET page that uses the include method for header. I am adding a JS variable that I access from JS functions In head.htm <script language="javascript" type="text/javascript"> var render=<%= RenderProperty %>; </script> The RenderProperty is a method in the base page class (a .cs file that inherits from System.Web.UI.Page) It looks something like this: private bool _renderProp = false; public bool RenderProperty { get { return _renderProp; } set { _renderProp = value; } } On a page by page basis, I set the RenderProperty in the Page_Load of a aspx page protected void Page_Load(object sender, EventArgs e) { RenderProperty = true; } I get a compile time error that says: The name 'RenderProperty' does not exist in the current context C:\...\head.htm

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• Is there a .NET BCL class to help with hand-rolled property path binding?

  - by Wayne

  WPF and Silverlight have a data binding model whereby I can provide a Binding with a Path which comprises a dot-notation of property accessors down from a DataContext to a specific value inside a complex object graph (eg. MyDataContext.RootProperty.SubProperty.Thing.Value) I have a (non-UI) requirement to accept such a path expressed as a simple string, and to use reflection on an object which is (hopefully) of a type which exposes the right property getters and setters in order to read and/or write values to those properties. Before I go off and start writing the parser and reflection code, is there a handy Framework 3.5 BCL class to help with this?

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• Force redraw before long running operations

  - by Joshua

  When you have a button, and do something like: Private Function Button_OnClick Button.Enabled = False [LONG OPERATION] End Function Then the button will not be grayed, because the long operation prevents the UI thread from repainting the control. I know the right design is to start a background thread / dispatcher, but sometimes that's too much hassle for a simple operation. So how do I force the button to redraw in disabled state? I tried .UpdateLayout() on the Button, but it didn't have any effects. I also tried System.Windows.Forms.DoEvents() which normally works when using WinForms, but it also had no effect.

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• Switching Javascript Function states

  - by webzide

  Dear experts, I would like to implement a API of Javascript that sort of resemble a light switch. For instance, there are two buttons on the actual HTML page act as the UI. Both of the buttons have event handlers that invokes a different function. Each function have codes that act like a state, for instance. button1.onclick=function (){ $("div").click( //code effects 2 ) } button2.onclick=function (){ $("div").click( //Code effects 2 ) } I the code works fine on the surface but the 2 state functions overlap. the effects is going to take place for the rest of the way until the next reload of the document. Basically what I want to achieve is that when 1 button is clicked, it will switch "OFF" the state of function invoked by the other button and vice versa. Thus, the effects achieved are unique are not overlapped. Is there anyway to achieve this or could any experts point me to the right direction. Thanks in advance.

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• Access &lt;body element from content page via a nested master page

  - by danwellman

  All I want to do is access the <body element from the code-behind of a content page and add a class name to it. I have a top-level master page with the <body element in it. Then I have a nested master page which is the master page for the content page. From the code behind of the content page I want to add a class name to the body element. That's all. I have this in the top-level master: <body id="bodyNode" runat="server"> I added this to the code-behind for the content page: Master.bodyNode.Attributes.add("class", "home-page"); And I get a message that: System.Web.UI.MasterPage' does not contain a definition for 'bodyNode If I add this to the aspx content page: <% @ MasterType VirtualPath="~/MasterPage.master"%> The message then changes to: bodyNode is inaccessible due to its protection level Please advise, I've wasted like 2 hours on what feels like something that should be really simple to do :(

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• No method 'get' on backbone model save

  - by user888734

  I'm using backbone for a reasonably complicated form. I have a number of nested models, and have been computing other variables in the parent model like so: // INSIDE PARENT MODEL computedValue: function () { var value = this.get('childModel').get('childModelProperty'); return value; } This seems to work fine for keeping my UI in sync, but as soon as I call .save() on the parent model, I get: Uncaught TypeError: Object #<Object> has no method 'get' It seems that the child model kind of temporarily stops responding. Am I doing something inherently wrong? EDIT: The stack trace is: Uncaught TypeError: Object #<Object> has no method 'get' publish.js:90 Backbone.Model.extend.neutralDivisionComputer publish.js:90 Backbone.Model.extend.setNeutralComputed publish.js:39 Backbone.Events.trigger backbone.js:163 _.extend.change backbone.js:473 _.extend.set backbone.js:314 _.extend.save.options.success backbone.js:385 f.Callbacks.o jquery.min.js:2 f.Callbacks.p.fireWith jquery.min.js:2 w jquery.min.js:4 f.support.ajax.f.ajaxTransport.send.d

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• Better Alternative to Telerik Draggable Panel ?

  - by user284523

  When putting a video in a Telerik Draggable Panel, when dragging the panel, on Firefox the video restart all over again because DOM is reconstructed. They don't seem to have an answer to this. Also we can't seem to be able to control the z-index as it doesn't take into account: when moving the panel over other telerik controls, the video slips under. So any other draggable panel that wouldn't have these annoyances ? Telerik doesn't seem to give any answer so we're afraid we're stuck and we cannot afford to wait longer. Currently think about using Yahoo UI.

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• Caching Web UserControl by Propety is not working (Grr!)

  - by PapillonUK

  Here's my code behind: <PartialCaching(60, Nothing, "UsrCtl_WebUserControl.CacheString", Nothing, True)> _ Partial Class UsrCtl_WebUserControl Inherits System.Web.UI.UserControl Private _CacheString As String Public Property CacheString() As String Get Return _CacheString End Get Set(ByVal value As String) _CacheString = value End Set End Property End Class Here's the user control embedded in a page: <uc:wuc ID="wuc" runat="server" CacheString="A" /> And in another page: <uc:wuc ID="wuc" runat="server" CacheString="B" /> According to the docs this control should maintain a different, 60 second cached version for each value of the CacheString property. It doesn't work - it caches for 60 seconds, but only one cached copy is created regardless of what I put in the CacheString property. Anyone any ideas what i'm doing wrong? - After 4 hours of this I have no hair or nails left - please save my monitor from the brick.

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• Android: Width and Height of View After Orientation Change

  - by David

  I need to get the width and height of a WebView and pass them in the query string of the URL I am loading in the WebView. I have found a way to do this in onResume(). Since the width and height are not calculated at this point, I post a Runnable to the WebView to be queued for after the UI loads. Here's my problem: when the orientation changes, I am handling it in onConfigurationChanged. When I try to post a Runnable in onConfigurationChanged to the WebView, the WebView's width and height end up being the old orientation's width and height. At what point can I intercept the new width and height after orientation change?

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• Eclipse Plugin: Enablement of an Action based on the current selection

  - by Itay

  I am using the org.eclipse.ui.popupMenus extension point for adding a sub-menu whose Action that is bounded to the following class: public class MyAction implements IObjectActionDelegate { private Logic logic = Logic.getInstance(); // Singleton public void setActivePart(IAction a, IWorkbenchPart targetPart) { // Nothing here } public void run(IAction a) { // Do something... } public void selectionChanged(IAction a, ISelection s) { a.setEnabled(logic.isEnabled(s)); } } This action is working correctly in most cases (including the call a.setEnabled() in selectionChanged()). My problem at the very first time my action is being invoked. The selectionChanged method is called only after the menu item has been displayed (and not when the user has made the selection) which means that the call to a.setEnabled() will have no affect. Any ideas on how to make my action receive selectionChanged() notifications even before the fist time it is being invoked?

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• Best way to move an image across part of the screen?

  - by rushonerok

  I have a Silverlight WP7 app and an image on my page that I want to appear to slide across the screen. What is the best way of doing this? I wrote this real quick but the UI doesn't update until the entire method is done. private void SpinImg(Image img, double left) { for(int i = 1; i <= 10000; i++) { img.Margin = new Thickness(left, img.Margin.Top + 1, 0, 0); if(img.Margin.Top > 314) { //move it to the top img.Margin = new Thickness(left, -105, 0, 0); } int wait = 1000 / i; Thread.Sleep(wait); } }

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• Can you create a "superset" target in Xcode ?

  - by thrusty

  For the purposes of unit testing I'd like to create an iPhone project target in Xcode that includes all of the release application files, plus some additional files containing code useful for UI unit testing. I can do this by duplicating the original application target; however, the problem with this is that every time I add a new source file to the app target, I need to also add it to the UnitTestUI target. It's not a big deal, just inconvenient to always remember to add files to both targets. Is there some way to set up a dependency so that every file added to the original app target is also auto added the unit test target?

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• Looking for Google Reader javscript commands for controlling events

  - by JayCrossler

  I've played in the /reader/ui/ code for a few hours now, and couldn't figure this out. Also, I didn't see any exact help when searching StackOverflow. This is really a JavaScript un-obfuscator question. I'm looking for a way to call the obfuscated Google Reader javascript commands... and am having trouble determining what actual function is called when the "Next Items" button is pressed or the spacebar is hit. I've tried using Firebug as well as FireEvents to track it down, but it's just too well hidden. Any ideas? Something that I could type into the URL bar and make it run, something like 'javascript:SH("entries-down", "click");void(0);' Thanks in advance! And, please let me know if it's against Google's terms of service to de-obfuscate their code to view these JavaScript commands.

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• looping through an object (tree)

  - by Val

  Is there a way (in jquery or javascript) to loop through each object and it's children and gandchildren and so on. if so... can i also read their name? example foo :{ bar:'', child:{ grand:{ greatgrand: { //and so on } } } } so the loop should do something like this... loop start if(nameof == 'child'){ //do something } if(nameof == 'bar'){ //do something } if(nameof =='grand'){ //do something } loop end I know this is stupid code but i tried to make it understandable :) btw this is for a jquery UI, as i am clueless how to go on about this. thanks

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• a question about flex preloaders

  - by dubbeat

  Hi, I'm moving to a pure as3 environment into flex and I have a question about preloaders. For one of my apps in particular when the swf loaded I would add a screen with an animated preloader. Then at a particular point in my code when I know all of my xml has been parsed, UI built and all initiliztion done I dispatch a "done" event which removes the preloader. How can I achieve this is flex? I've only ever really seen flex preloaders that are percentage based which I believe represent the actual loading of the swf itself?

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• What really is the purpose of "base" keyword in c#?

  - by Pandiya Chendur

  Thus for used base class for some commom reusable methods in every page of my application... public class BaseClass:System.Web.UI.Page { public string GetRandomPasswordUsingGUID(int length) { string guidResult = System.Guid.NewGuid().ToString(); guidResult = guidResult.Replace("-", string.Empty); return guidResult.Substring(0, length); } } So if i want to use this method i would just do, public partial class forms_age_group : BaseClass { protected void Page_Load(object sender, EventArgs e) { //i would just call it like this string pass = GetRandomPasswordUsingGUID(10); } } It does what i want but there is a "Base" keyword that deals with base class in c# ... I really want to know when should use base keyword in my derived class.... Any good example...

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• Best way to globally set every control's ValidationGroup property in an asp.net?

  - by Steve Flook

  I have a User Control with form items that is re-used considerably throughout a large web application, and up until this point the validation summary upon an invalid form submission is being handled by the .aspx that consumes the User Control. Now I need to set the ValidationGroup property at runtime for each of my form items controls (textboxes, lists, validators, etc). Rather than do it manually by setting each control I'm interested in iterating through all the controls in the User Control, detecting if that control has a ValidationGroup property, and setting it's value that way. Something like this: For Each ctrl As System.Web.UI.Control In Me.Controls ' so now what is the proper way to detect if this control has the ValidationGroup property Next Code sample in vb.net or c# works for me. Many thanks!

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• Differences in MS Office Charts

  - by simendsjo

  I'm about to do some Office integration creating charts from some data-sources and adding them to PPT slides. But some coworkers are saying using PPT charts is suboptimal as they are missing features of Excel charts, and are different in many ways. They're unable to come up with examples, and so am I... I found the following blog about Office2007, saying there are some differences in the programming model, but that they all use the same underlying engine. Are there really any differences in the capabilities of the charts? Is it mostly UI issues? What features are different/missing from PPT charts? Are these issues resolved in Office2010?

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• ASP.NET Thread Safety in aspx.cs code behind file

  - by Tim Michalski

  I am thinking of adding a DataContext as a member variable to my aspx.cs code-behind class for executing LinqToSql queries. Is this thread safe? I am not sure if a new instance of this code-behind class is created for each HTTP request, or if the instance is shared amongst all request threads? My fear is that I will get 10 simultaneous concurrent http requests that will be using the same database session. public partial class MyPage : System.Web.UI.Page { private DataContext myDB = new DataContext(); protected void MyAction_Click(object sender, EventArgs e) { myDB.DoWork(); } }

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• How to show a ProgressDialog while changing from a activity to another activity?

  - by AndroidUser99

  i want to show a PD when my activity A starts another activity B. But in that onclick method, my A activity haves to do some work before start B, and B also haves to do some work because it haves to load a lot of data for the UI. I need a PD that is viewed by the user in all the process of the loading data of changin from activity A to B. ¿how can do it? i tryed storing a static ProgressDialog on MyApplication.java, and with these methods: public static void showProgressDialog(Context c) { pd = ProgressDialog.show(c, c.getResources().getString(R.string.app_name), c.getResources().getString(R.string.loading), true, false); } public static void dismissProgressDialog(){ pd.dismiss(); } but it doesn't works, it doesn't shows nothing, i dont know why how to achieve this by a easy way? i know that i can do it with async task, but that is too hard for me, i can't understand the code examples i am finding on this web and google code examples are welcome thanks

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