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  • I don't get object-oriented programming

    - by Joel J. Adamson
    Note: this question is an edited excerpt from a blog posting I wrote a few months ago. After placing a link to the blog in a comment on Programmers.SE someone requested that I post a question here so that they could answer it. This posting is my most popular, as people seem to type "I don't get object-oriented programming" into Google a lot. Feel free to answer here, or in a comment at Wordpress. What is object-oriented programming? No one has given me a satisfactory answer. I feel like you will not get a good definition from someone who goes around saying “object” and “object-oriented” with his nose in the air. Nor will you get a good definition from someone who has done nothing but object-oriented programming. No one who understands both procedural and object-oriented programming has ever given me a consistent idea of what an object-oriented program actually does. Can someone please give me their ideas of the advantages of object-oriented programming?

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  • MKMapView - viewForAnnotation not called while loading more results

    - by Dave
    I have a search enabled map view. When user hits search, my custom annotations are added to the map view. The search returns 20 results with a 'load more' link. When I hit load more, more annotations should be added to map view. The problem is - annotations gets added to the map view but is not displayed on the map. If I zoom in or zoom out to change the map region, the pins are shown. I find that viewForAnnotations: is not getting called when i hit 'load more'. I am not sure how to trigger this. any one?

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  • Ubuntu 12.04, Can hear the sound but Sound option in settings shows no sound card

    - by Vivek Srivastava
    I have weired issue. I did a fresh installation of Ubuntu 12.04. Then I installed Nvidia drives for my graphics card. I executed the command "modprobe nvidia" after installing the Nvidia drivers and rebooted. After reboot, sound indicator in top panel is disabled and I can't control the volume from there. I opened Settings Sound and it does not show any sound card installed. However, I can hear the sound. Please help. Output of lspci | grep Audio 00:1b.0 Audio device: Intel Corporation N10/ICH 7 Family High Definition Audio Controller (rev 01) 01:00.1 Audio device: NVIDIA Corporation GF110 High Definition Audio Controller (rev a1) Output of lsmod | grep snd snd_hda_codec_hdmi 32191 4 snd_hda_codec_realtek 73851 1 snd_hda_intel 33367 0 snd_hda_codec 134156 3 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel snd_hwdep 13668 1 snd_hda_codec snd_pcm 97188 3 snd_hda_codec_hdmi,snd_hda_intel,snd_hda_codec snd_timer 29990 1 snd_pcm snd 78855 7 snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_pcm,snd_timer soundcore 15091 1 snd snd_page_alloc 18529 2 snd_hda_intel,snd_pcm

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  • Hide UITabBarController?

    - by David.Chu.ca
    I have root view with both tab bar and navigation bar visible at the beginning. When the view is moved to the next level, I would like to hide the tab bars, and when the view is moved back, I would like the tab bar visible. Is there any way to do that?

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  • Sharepoint - connectable receiving, XSLT editable web part?

    - by Corey O.
    You can use the "Data View" webpart to take data from a database call, then you can edit the XSLT manually to make it look and do whatever you want, within the scope of that data and XSLT capabilities. Is there a web part that allows me to do the same thing, but with data that is received by a connected webpart source rather than a database set? For example: I'd like to be able to pull in a Data View webpart that queries a bunch of data and makes it available all over the page. Then, I would like to hide that Data View. Once it is hidden, I'd like to be able to take another customizable webpart and pull a field (or multiple fields if possible) from the Data View webpart via a webpart connection. This would allow me to display various fields in creative formats without having to call the same query multiple times on the same page by different webparts. Is there an in house webpart that will allow me to do this?

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  • Get information about AutocompleteTextView from resulting AutoCompleteTextView$DropDownListView

    - by Stev_k
    I'm using 3 AutocompleteTextViews to suggest entries from a database. I subclassed AutocompleteTextView to handle setting the default text to null when clicked and setting back to the default instructions if moved away and nothing is entered. I was using a SimpleCursorAdapter to bind to the view, but I discovered that there was no way I could get the id of the AutocompleteTextView from an OnItemClickListener, which I needed to put additional information from the selected row in a variable depending on which AutocompleteTextView it was from. All I could access was the AutoCompleteTextView$DropDownListView, which is an undocumented inner class that appears to offer no real functionality. Neither was there a way to go up the view hierarchy to get the original AutocompleteTextView. So I subclassed SimpleCursorAdapter and added an int to the constructor to identify which AutocompleteTextView the adapter was from, and I was able to access this from the view passed into OnItemClick(). So, although my solution works fine, I wonder if it is possible to get the id of an AutocompleteTextView from its DropDownListView? I am also using another database query which gets the id from the OnItemClick and then looks up the data for that item, because I couldn't find a way of converting more than one column to a string. Should I be using CursorAdapter for this, to save initiating another query? Oh, and another thing, do I need a database cursor initially (all_cursor) when all I'm doing is filtering on it to get a new cursor? Seems like overkill. Activity .... dbse.openDataBase(); Cursor all_Cursor = dbse.autocomplete_query(); startManagingCursor(all_Cursor); String[] from_all = new String[]{DbAdapter.KEY_NAME}; int[] to_all = new int[] {android.R.id.text1}; from_adapt = new AutocompleteAdapter(FROM_DBADAPTER, this,android.R.layout.simple_dropdown_item_1line, all_Cursor, from_all, to_all); from_adapt.setStringConversionColumn(1); from_adapt.setFilterQueryProvider(this); to_adapt = new AutocompleteAdapter(TO_DBADAPTER, this,android.R.layout.simple_dropdown_item_1line, all_Cursor, from_all, to_all); to_adapt.setStringConversionColumn(1); to_adapt.setFilterQueryProvider(this); from_auto_complete = (Autocomplete) findViewById(R.id.entry_from); from_auto_complete.setAdapter(from_adapt); from_auto_complete.setOnItemClickListener(this); to_auto_complete = (Autocomplete) findViewById(R.id.entry_to); to_auto_complete.setAdapter(to_adapt); to_auto_complete.setOnItemClickListener(this); public void onItemClick (AdapterView<?> parent, View view, int position, long id) { Cursor selected_row_cursor = dbse.data_from_id(id); selected_row_cursor.moveToFirst(); String lat = selected_row_cursor.getString(1); String lon = selected_row_cursor.getString(2); int source = ((AutocompleteAdapter) parent.getAdapter()).getSource(); Autocomplete class: public class Autocomplete extends AutoCompleteTextView implements OnTouchListener,OnFocusChangeListener{ String textcontent; Context mycontext = null; int viewid = this.getId(); public Autocomplete(Context context, AttributeSet attrs) { super(context, attrs); textcontent = this.getText().toString(); mycontext = context; this.setOnFocusChangeListener(this); this.setOnTouchListener(this); } public boolean onTouch(View v, MotionEvent event) { if (textcontent.equals(mycontext.getString(R.string.from_textbox)) | textcontent.equals(mycontext.getString(R.string.to_textbox)) | textcontent.equals(mycontext.getString(R.string.via_textbox))) { this.setText(""); } return false; } public void onFocusChange(View v, boolean hasFocus) { if (hasFocus == false) { int a = this.getText().length(); if (a == 0){ if (viewid == R.id.entry_from) {this.setText(R.string.from_textbox);} if (viewid == R.id.entry_to) {this.setText(R.string.to_textbox);} if (viewid == R.id.entry_via) {this.setText(R.string.via_textbox);} } } } } Adapter: public class AutocompleteAdapter extends SimpleCursorAdapter { int source; public AutocompleteAdapter(int query_source, Context context, int layout, Cursor c, String[] from, int[] to) { super(context, layout, c, from, to); source = query_source; } public int getSource() { return source; } } sorry that's a lot of code! Thanks for your help. Stephen

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  • Multiple skins in ASP.NET MVC using StringTemplate

    - by Jamie
    I am considering the StringTemplate view engine for my ASP.NET MVC application. This application will be built with one skin, but I then expect many more, often very similar skins to be developed for it. This is primiarly the reason for my choice of StringTemplate as the view engine, as there will be zero logic in the views. In my head, I envisaged having each skin in a directory under the 'Views' directory in the folder structure, then maintaining a data structure which maps hostnames to skin directories. An obvious disadvantage of this approach is that I will have to explicitly specify my view files - an alternative might be to hack the implementation of the View() method to change the /views/controller/action standard path and insert an extra layer. Is anyone aware of any examples of implementations along these lines using ASP.NET MVC and StringTemplate at present? Can anyone forsee any potential problems with my approach? Thanks in advance.

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  • Android: Saving custom button and spinner on orientation change

    - by Jacob Huggart
    Hello All, I am new to Android programming and was handed a fairly large program that is almost complete, but needed support for switching between portrait and landscape view. I added android:configChanges="keyboardHidden|orientation" to the manifest and used onConfigurationChanged to save the view data and that works. However, there is a button that displays the date selected (when pressed a calendar to select the date comes up) and a spinner that displays the current view and is used to select a new view. Those two items are being cleared/reset and do not work at all after the screen flip. I have been attempting to use onSaveInstanceState and onRestoreInstanceState to fix that, but I cannot figure out how to get it to work. Any advice? FYI, This is how my spinner is set up: Spinner s = (Spinner) findViewById(R.id.siteSelector); ArrayAdapter<?> adapter = ArrayAdapter.createFromResource( this, R.array.sites, android.R.layout.simple_spinner_item); adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item); s.setAdapter(adapter);

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  • Fancybox, getting Fancybox to bind using LIVE() to items being loaded onto the page after load

    - by nobosh
    I have a page that loads and after it loads, it pulls in a list of LIs to populate a news feed. quick view quick view quick view I'm trying to get fancy box to trigger when a user clicks on quick view but haven't had any luck. Any Ideas? $(document).ready(function() { $('.quickview').fancybox(); }); also tried: $(document).ready(function() { $('a.quickview').live('click', function() { $(this).fancybox(); }); }); http://fancybox.net/ Thanks for any ideas...

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  • Selection Highlight in NSCollectionView

    - by Hooligancat
    On some occasions my head just hurts from banging it against the Cocoa wall. Today is one of those days. I have a working NSCollectionView with one minor, but critical, exception. Getting and highlighting the selected item within the collection. I've had all this working prior to Snow Leopard, but something appears to have changed and I can't quite place my finger on it, so I took my NSCollectionView right back to a basic test and followed Apple's documentation for creating an NSCollectionView here: http://developer.apple.com/mac/library/DOCUMENTATION/Cocoa/Conceptual/CollectionViews/Introduction/Introduction.html The collection view works fine following the quick start guide. However, this guide doesn't discuss selection other than "There are such features as incorporating image views, setting objects as selectable or not selectable and changing colors if they are selected". Using this as an example I went to the next step of binding the Array Controller to the NSCollectionView with the controller key selectionIndexes, thinking that this would bind any selection I make between the NSCollectionView and the array controller and thus firing off a KVO notification. I also set the NSCollectionView to be selectable in IB. There appears to be no selection delegate for NSCollectionView and unlike most Cocoa UI views, there appears to be no default selected highlight. So my problem really comes down to a related issue, but two distinct questions. How do I capture a selection of an item? How do I show a highlight of an item? NSCollectionView's programming guides seem to be few and far between and most searches via Google appear to pull up pre-Snow Leopard implementations, or use the view in a separate XIB file. For the latter (separate XIB file for the view), I don't see why this should be a pre-requisite otherwise I would have suspected that Apple would not have included the view in the same bundle as the collection view item. I know this is going to be a "can't see the wood for the trees" issue - so I'm prepared for the "doh!" moment. As usual, any and all help much appreciated.

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  • AdMob and UINavigationControllers

    - by Ward
    I'm playing around with AdMob and I"m trying to get something going with an auto-rotating view inside a uinavigationcontroller. I have the ad at the top of the screen. Not sure if this is the right approach, but in my LoadView method I have: self.navigationController.view.frame = CGRectMake(0,48,320,432); The navbar appears below the ad. When I rotate the phone to landscape is there a way to get the navbar (which is now across the top) to be 432px wide so it doesn't get cut off under the ad? I tried writing a method that is called when the device orientation changes, but it seems like manipulating the view on the navigationcontroller screws things up for every orientation except portrait. The view keeps getting shorter until it disappears. Thanks, Howie

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  • The Complementary Roles of PLM and PIM

    - by Ulf Köster
    Oracle Product Value Chain Solutions (aka Enterprise PLM Solutions) are a comprehensive set of product management solutions that work together to provide Oracle customers with a broad array of capabilities to manage all aspects of product life: innovation, design, launch, and supply chain / commercialization processes beyond the capabilities and boundaries of traditional engineering-focused Product Lifecycle Management applications. They support companies with an integrated managed view across the product value chain: From Lab to Launch, From Farm to Fork, From Concept to Product to Customer, From Product Innovation to Product Design and Product Commercialization. Product Lifecycle Management (PLM) represents a broad suite of software solutions to improve product-oriented business processes and data. PLM success stories prove that PLM helps companies improve time to market, increase product-related revenue, reduce product costs, reduce internal costs and improve product quality. As a maturing suite of enterprise solutions, PLM is still evolving to realize the promise it can provide across all facets of a business and all phases of the product lifecycle. The vision for PLM includes everything from gathering early requirements for a product through multiple stages of the product lifecycle from product design, through commercialization and eventual product retirement or replacement. In discrete or process industries, PLM is typically more focused on Product Definition as items with respect to the technical view of a material or part, including specifications, bills of material and manufacturing data. With Agile PLM, this is specifically related to capabilities addressing Product Collaboration, Governance and Compliance, Product Quality Management, Product Cost Management and Engineering Collaboration. PLM today is mainly addressing key requirements in the early product lifecycle, in engineering changes or in the “innovation cycle”, and primarily adds value related to product design, development, launch and engineering change process. In short, PLM is the master for Product Definition, wherever manufacturing takes place. Product Information Management (PIM) is a product suite that has evolved in parallel to PLM. Product Information Management (PIM) can extend the value of PLM implementations by providing complementary tools and capabilities. More relevant in the area of Product Commercialization, the vision for PIM is to manage product information throughout an enterprise and supply chain to improve product-related knowledge management, information sharing and synchronization from multiple data sources. PIM success stories have shown the ability to provide multiple benefits, with particular emphasis on reducing information complexity and information management costs. Product Information in PIM is typically treated as the commercial view of a material or part, including sales and marketing information and categorization. PIM collects information from multiple manufacturing sites and multiple suppliers into its repository, but also provides integration tools to push the information back out to the other systems, serving as an active central repository with the aim to provide a holistic view on any product sold by a company (hence the name “Product Hub”). In short, PIM is the master of commercial Product Information. So PIM is quickly becoming mandatory because of its value in optimizing multichannel selling processes and relationships with customers, as you can see from the following table: Viewpoint PLM Current State PIM Key Benefits PIM adds to PLM Product Lifecycle Primarily R&D Front end Innovation Cycle Change process Primarily commercial / transactional state of lifecycle Provides a seamless information flow from design and manufacturing through the ultimate selling and servicing of products Data Primarily focused on “item” vs. “product” data Product structures Specifications Technical information Repository for all product information. Reaches out to entire enterprise and its various silos of product information and descriptions Provides a “trusted source” of accurate product information to the internal organization and trading partners Data Lifecycle Repository for all design iterations Historical information Released, current information, with version management and time stamping Provides a single location to track and audit historical product information Communication PLM release finished product to ERP PLM is the master for Product Definition Captures information from disparate sources, including in-house data stores Recognizes the reality of today’s data “mess” across information silos Provides the ability to package product information to its audience in the desired, relevant format to meet their exacting business requirements Departmental R&D Manufacturing Quality Compliance Procurement Strategic Marketing Focus on Marketing and Sales Gathering information from other Departments, multiple sites, multiple suppliers A singular enterprise solution that leverages existing information silos and data stores Supply Chain Multi-site internal collaboration Supplier collaboration Customer collaboration Works with customers, exchanges / data pools, and trading partners to provide relevant product information packaged the way the customer desires Provides ability to provide trading partners and internal customers with information in a manner they desire, continuously Tools Data Management Collaboration Innovation Management Cleansing Synchronization Hub functions Consistent, clean and complete commercial product information The goals of both PLM and PIM, put simply, are to help companies make more profit from their products. PLM and PIM solutions can be easily added as they share some of the same goals, while coming from two different perspectives: the definition of the product and the commercialization of the product. Both can serve as a form of product “system of record”, but take different approaches to delivering value. Oracle Product Value Chain solutions offer rich new strategies for executives to collectively leverage Agile PLM, Product Data Hub, together with Enterprise Data Quality for Products, and other industry leading Oracle applications to achieve further incremental value, like Oracle Innovation Management. This is unique on the market today.

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  • UIViewAnimationTransitionCurlUp in landscape mode transitioning right-to-left

    - by Thanos
    I have a view controller that is showing in portrait mode. When you touch the "menu" button, it calls the code below and it flips up to the MainMenu controller. So far, so good. - (void) menuButton: (id) sender { MainMenu_ViewController * viewController = [[MainMenu_ViewController alloc] initWithNibName:@"MainMenu_ViewController" bundle:nil]; self.menuView = viewController.view; self.menuView.frame = self.view.bounds; [viewController release]; [UIView beginAnimations:nil context: nil]; [UIView setAnimationDuration: 1.0]; [UIView setAnimationTransition: UIViewAnimationTransitionCurlUp forView: self.view cache: YES]; [self.view addSubview: self.menuView]; [UIView commitAnimations]; } However, when you do the same in landscape mode, instead of the animation flipping up (with respect to gravity, i.e. towards the long end of the iPhone) it flips towards the left (i.e. towards the short end of the iPhone). Is this a limitation of the animation, or am I missing something?

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  • How to layer views

    - by Finer Recliner
    I have a custom-made view that extends the View class. I would like 2 instances of my custom view layered directly on top of each other. How should my layout file look to achieve this?

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  • How to detect changes to Address Book after ABPersonViewController presentation

    - by nkhorman
    I have two view controllers that allow changes to the Address Book. The first one lets you add or create an entry based on an ABRedordRef or edit an existing ABRecordRef, by presentation of either ABUnknownPersonViewController or ABPersonViewController. The second one is a standard ABPeoplePickerNavigationController that allows you to view/edit any of the contents of the Address Book. Both views are accessible easily accessible to the use via the main application UITabBarController. How can I determine that changes were made by either view controller, so that I can force data dependency changes to a third separate view controller. I thought that I saw a notification center message that I could subscribe to, but I can't seem to find it again... I don't care if the notification center is the method that should be used, or a delegate protocol or... whatever, I don't care, I just need to know how to detect the change or the need to re-sync with the Address Book. Can someone Please point me in the right direction. Thank you.

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  • Hiding UITabBar when rotating device iPhone

    - by Tom G
    Has anyone successfully hidden a UITabbar when rotating the device? I have one view in the UItabbar controller that i rotate (So effectively one tab that rotates) When this happens i want the tab bar to disappear... but nothing seems to work! Either the tabbar still remains visible Or it disappears along with the view Or the tabbar disappears and the view no longer rotates! So if anyone has successfully accomplished this task any advice would be greatly appreciated! Thanks Tom

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  • MVP on Asp.Net WebForms

    - by Nicolas Irisarri
    I'm not clear about this.... When having a gridview on the View, is the controller who has to set up the Data source, columns, etc? or I just have to expose the DataBinding stuff, fire it from the controller and let the html/codebehind on the view handle all the rendering and wiring up? To be more precise: on the view should I have private GridView _gv public _IList<Poco> Source { get {_gv.DataSource;} set {_gv.DataSource = value; _gv.DataBind();} } Or should it be (from http://stackoverflow.com/questions/153222/mvp-pattern-passive-view-and-exposing-complex-types-through-iview-asp-net-web) private GridView _datasource; public DataSource { get { return _datasource; } set { _datasource = value; _datasource.DataBind(); } } Maybe I'm having it all wrong .... Where can I find an example that is not a "Hello world" example on MVP for ASP.Net???

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  • wpf usercontrol within usercontrol with the help of region manager

    - by Miral
    Sorry for weird title, actually i can only explain my question but cannot put in a few words in the title. I am developing WPF Composite application with PRISM approach. I have got a common WPF usercontrol which is gonna be used by all other usercontrol, i.e. usecontrol within a usercontrol. The common usercontrol has got a button "ProcessMultiple" which I want it to behave differently from all usercontrol. I am using RegionManager to add this views. I have got PresentationModel for all the usercontrol IRegion historyUpdaterRegion = _regionManager.Regions["HistoryUpdaterRegion"]; IRegionManager historyUpdaterRegionManager = historyUpdaterRegion.Add(_unityContainer.Resolve<IHistoryDocumentUpdaterPresentationModel>().View, null, true); historyUpdaterRegionManager.RegisterViewWithRegion("ProcessMultiple", () => _unityContainer.Resolve<IProcessMultiplePresentationModel>().View); IRegion refundArrivalRegion = _regionManager.Regions["RefundArrivalRegion"]; IRegionManager refundArrivalRegionManager = refundArrivalRegion.Add(_unityContainer.Resolve<IRefundArrivalProcessorPresentationModel>().View, null, true); refundArrivalRegionManager.RegisterViewWithRegion("ProcessMultiple", () => _unityContainer.Resolve<IProcessMultiplePresentationModel>().View);

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  • Navigation (controller) in Tabbar (c) in Navigation (c) (iphone)

    - by Jonathan
    I want to have a TabBar controller inside a navigation controller. So that when an item is selected on the first Navigation Controller it pushes the TabBar into view. Inside this tabbar on the first tab is another navigation controller. However I only want one navigation bar. I've come up with 2 ways but not sure which way is better (Ie more acceptable etc)? 1) The first navigation controller isn't actually a navigation controller but to the user it looks like one. So when a cell is selected on it's table view the first navC's view is removed from the superview and the TabBarC's view is added, animation would have to be done manually. 2)The first NavC is actually a NavC and when an item is selected and the TabBar is pushed on to the screen the first NavC's navigationbar is hidden so that the first tab's navigationBar is the only nav bar on screen.

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  • Problem showing modelstate errors while using RenderPartialToString

    - by Martin
    Im using the following code: public string RenderPartialToString(ControllerContext context, string partialViewName, ViewDataDictionary viewData, TempDataDictionary tempData) { ViewEngineResult result = ViewEngines.Engines.FindPartialView(context, partialViewName); if (result.View != null) { StringBuilder sb = new StringBuilder(); using (StringWriter sw = new StringWriter(sb)) { using (HtmlTextWriter output = new HtmlTextWriter(sw)) { ViewContext viewContext = new ViewContext(context, result.View, viewData, tempData, output); result.View.Render(viewContext, output); } } return sb.ToString(); } return String.Empty; } To return a partial view and a form through JSON. It works as it should, but as soon as I get modelstate errors my ValidationSummary does not show. The JSON only return the default form but it does not highlight the validation errors or show the validation summary. Am I missing something? This is how I call the RenderPartialToString: string partialView = RenderPartialToString(this.ControllerContext, "~/Areas/User/Views/Account/ChangeAccountDetails.ascx", new ViewDataDictionary(avd), new TempDataDictionary());

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  • iPhone SDK: TextView, Keyboard in Landscape mode

    - by Arnold
    Hello. How do I make sure that the textview is shown and the keyboard is not obscuring the textview, while in landscape. Using UICatalog I created a TextViewController which works. In it there are two methods for calling the keyboard and making sure that textView is positioned above the keyboard. his just works great in Portrait mode. I got the Landscape mode working, but on the textView is still being put to the top of the iPhone to compensate for the keyboard in portrait mode. I changed the methods for showing the keyboards. Below is the code for this methods: (I will just let see the code for show, since the hide code will be the reverse.. - (void)keyboardWillShow:(NSNotification *)aNotification { UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; if (orientation == UIInterfaceOrientationPortrait) { // the keyboard is showing so resize the table's height CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue]; NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]; CGRect frame = self.view.frame; frame.size.height -= keyboardRect.size.height; [UIView beginAnimations:@"ResizeForKeyboard" context:nil]; [UIView setAnimationDuration:animationDuration]; self.view.frame = frame; [UIView commitAnimations]; } else if (orientation == UIInterfaceOrientationLandscapeLeft) { NSLog(@"Left"); // Verijderen later CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue]; NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]; CGRect frame = self.view.frame; frame.size.width -= keyboardRect.size.height; [UIView beginAnimations:@"ResizeForKeyboard" context:nil]; [UIView setAnimationDuration:animationDuration]; self.view.frame = frame; [UIView commitAnimations]; } else if (orientation == UIInterfaceOrientationLandscapeRight){ NSLog(@"Right"); // verwijderen later. CGRect keyboardRect = [[[aNotification userInfo] objectForKey:UIKeyboardBoundsUserInfoKey] CGRectValue]; NSTimeInterval animationDuration = [[[aNotification userInfo] objectForKey:UIKeyboardAnimationDurationUserInfoKey] doubleValue]; CGRect frame = self.view.frame; frame.size.width -= keyboardRect.size.width; [UIView beginAnimations:@"ResizeForKeyboard" context:nil]; [UIView setAnimationDuration:animationDuration]; self.view.frame = frame; [UIView commitAnimations]; } } I know that I have to change the line frame.size.height -= keyboardRect.size.height but I do not seem to get it working. I tried frame.size.width -= keyboardRect.size.height that did not work. Losing the keyboardRect and frame all together work, however off course the keyboard obscures the textview........

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  • C# 4.0: Covariance And Contravariance In Generics

    - by Paulo Morgado
    C# 4.0 (and .NET 4.0) introduced covariance and contravariance to generic interfaces and delegates. But what is this variance thing? According to Wikipedia, in multilinear algebra and tensor analysis, covariance and contravariance describe how the quantitative description of certain geometrical or physical entities changes when passing from one coordinate system to another.(*) But what does this have to do with C# or .NET? In type theory, a the type T is greater (>) than type S if S is a subtype (derives from) T, which means that there is a quantitative description for types in a type hierarchy. So, how does covariance and contravariance apply to C# (and .NET) generic types? In C# (and .NET), variance applies to generic type parameters and not to the resulting generic type. A generic type parameter is: covariant if the ordering of the generic types follows the ordering of the generic type parameters: Generic<T> = Generic<S> for T = S. contravariant if the ordering of the generic types is reversed from the ordering of the generic type parameters: Generic<T> = Generic<S> for T = S. invariant if neither of the above apply. If this definition is applied to arrays, we can see that arrays have always been covariant because this is valid code: object[] objectArray = new string[] { "string 1", "string 2" }; objectArray[0] = "string 3"; objectArray[1] = new object(); However, when we try to run this code, the second assignment will throw an ArrayTypeMismatchException. Although the compiler was fooled into thinking this was valid code because an object is being assigned to an element of an array of object, at run time, there is always a type check to guarantee that the runtime type of the definition of the elements of the array is greater or equal to the instance being assigned to the element. In the above example, because the runtime type of the array is array of string, the first assignment of array elements is valid because string = string and the second is invalid because string = object. This leads to the conclusion that, although arrays have always been covariant, they are not safely covariant – code that compiles is not guaranteed to run without errors. In C#, the way to define that a generic type parameter as covariant is using the out generic modifier: public interface IEnumerable<out T> { IEnumerator<T> GetEnumerator(); } public interface IEnumerator<out T> { T Current { get; } bool MoveNext(); } Notice the convenient use the pre-existing out keyword. Besides the benefit of not having to remember a new hypothetic covariant keyword, out is easier to remember because it defines that the generic type parameter can only appear in output positions — read-only properties and method return values. In a similar way, the way to define a type parameter as contravariant is using the in generic modifier: public interface IComparer<in T> { int Compare(T x, T y); } Once again, the use of the pre-existing in keyword makes it easier to remember that the generic type parameter can only be used in input positions — write-only properties and method non ref and non out parameters. Because covariance and contravariance apply only to the generic type parameters, a generic type definition can have both covariant and contravariant generic type parameters in its definition: public delegate TResult Func<in T, out TResult>(T arg); A generic type parameter that is not marked covariant (out) or contravariant (in) is invariant. All the types in the .NET Framework where variance could be applied to its generic type parameters have been modified to take advantage of this new feature. In summary, the rules for variance in C# (and .NET) are: Variance in type parameters are restricted to generic interface and generic delegate types. A generic interface or generic delegate type can have both covariant and contravariant type parameters. Variance applies only to reference types; if you specify a value type for a variant type parameter, that type parameter is invariant for the resulting constructed type. Variance does not apply to delegate combination. That is, given two delegates of types Action<Derived> and Action<Base>, you cannot combine the second delegate with the first although the result would be type safe. Variance allows the second delegate to be assigned to a variable of type Action<Derived>, but delegates can combine only if their types match exactly. If you want to learn more about variance in C# (and .NET), you can always read: Covariance and Contravariance in Generics — MSDN Library Exact rules for variance validity — Eric Lippert Events get a little overhaul in C# 4, Afterward: Effective Events — Chris Burrows Note: Because variance is a feature of .NET 4.0 and not only of C# 4.0, all this also applies to Visual Basic 10.

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  • Altering the ASP.NET MVC 2 ActionResult on HTTP post

    - by Inge Henriksen
    I want to do some processing on a attribute before returning the view. If I set the appModel.Markup returned in the HttpPost ActionResult method below to "modified" it still says "original" on the form. Why cant I modify my attribute in a HttpGet ActionResult method? [HttpGet] public ActionResult Index() { return View(new MyModel { Markup = "original" }); } [HttpPost] public ActionResult Index(MyModel appModel) { return View(new MyModel { Markup = "modified" }); }

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