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• How to Best Optimize up Model Transforms, Import 3DS Animations Into XNA 4.0?

  - by Jason R. Mick

  Relative beginner to XNA, but trying to build a multi-purpose (3D) game frameworking in XNA 4. Been using the Reed (O'Reilly) and Cawood/McGee (McGraw Hill) guides. My question is multi-faceted and involves how to most efficiently handle models. I'm using 3DS Max 2010 with kw-Xport to ship out my models as .X files. Solved an early problem by using my depth stencil state. My models are now loading properly (yay!) and I have basic bounding working, I just want to optimize transforming models and get animations working as a next step. My questions on models are: 1. Do you have any suggestions for good resources on exporting 3DS animations to XNA? I've seen some resources on how to handle animations in XNA, but most skimp on basic topics of how to convert multi-animation 3DS files. For example how do I take one big long string of keyframed animations (say running, frame 5-20, climbing frames 25-45, etc.) and turned them into named XNA animations. To my understanding every XNA animation has to have a name, but I haven't seen any tutorials on creating a new named animation from a subset of frames. 2. Is it faster to load a model once and animate/transform that base model on the fly @ draw time, or to load multiple models? My game will have multiple enemies, and I've already seen some lagginess in XNA, so II want to make my code efficient... 3. I've heard people on app hub talking about making custom content processors for models-- what is the benefit of this? Does it speed up transforming or animating the models? If so, can you point me towards any good (model-centric) tutorials? (I've built a custom height map content processor to generate terrain, following Cawood's examples, I'm just a bit confused as to how a model content processor would be implemented.)

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• Where is it permissible to add logging code in a MVC model?

  - by BDotA

  Working on a C# WinForms program that is written in a MVC ( actually Model-View-Presenter) style and I want to add a few lines of code that is responsible for logging some events. Where should I write two or three lines of code that I need? Should I write it in the Presenter section? To get an idea, here is some lines of sample code that already exists in the Save() metohd in Company.MyApplication.Presenter.MyPresenter.cs class: he has written codes lie the following in this part of presenter: private void Save(Helper.SaveStatusEnum status) { if (notification.CheckLocks(orderIdCollection)) { using (new HourglassController()) { controller.FireActiveCellLeaving(); ViewDocumentedValues(); int result = saveController.Save(status); if (result == Helper.SAVE_SUCCESSFUL) { // IS IT OK TO WRITE MY COUPLE LINES OF CODE IN HERE??????????? model.Dirty = false; if ((model.CurrentStatus == Helper.OrderStatusEnum.Complete) || (model.CurrentStatus == Helper.OrderStatusEnum.Corrected)) { controller.EnableDisableSheet(false); } CheckApplicationState(); SheetHelper.ClearUnsavedDataRowImage(view.ActiveSheet); } else { MessageBox.Show("An unexpected error occuring trying to save."); } } } }

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• What is the disadvantage of using abstract class as a database connectivity in zend framework 2 instead of service locator

  - by arslaan ejaz

  If I use database by creating adapter with drivers, initialize it in some abstract class and extend that abstract class to required model. Then use simple query statement. Like this: namespace My-Model\Model\DB; abstract class MysqliDB { protected $adapter; public function __construct(){ $this->adapter = new \Zend\Db\Adapter\Adapter(array( 'driver' => 'Mysqli', 'database' => 'my-database', 'username' => 'root', 'password' => '' )); } } And use abstract class of database like this in my models: class States extends DB\MysqliDB{ public function __construct(){ parent::__construct(); } protected $states = array(); public function select_all_states(){ $data = $this->adapter->query('select * from states'); foreach ($data->execute() as $row){ $this->states[] = $row; } return $this->states; } } I am new to zend framework, before i have experience of working in YII and Codeigniter. I like the object oriented in zend so i want to use it like this. And don't want to use it through service locater something like this: public function getServiceConfig(){ return array( 'factories' => array( 'addserver-mysqli' => new Model\MyAdapterFactory('addserver-mysqli'), 'loginDB' => function ($sm){ $adapter = $sm->get('addserver-mysqli'); return new LoginDB($adapter); } ) ); } In module. Am i Ok with this approach?

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• How do I keep a 3D model on the screen in OpenGL?

  - by NoobScratcher

  I'm trying to keep a 3D model on the screen by placing my glDrawElement functions inside the draw function with the declarations at the top of .cpp. When I render the model, the model attaches it self to the current vertex buffer object. This is because my whole graphical user interface is in 2D quads except the window frame. Is there a way to avoid this from happening? or any common causes of this? Creating the file object: int index = IndexAssigner(1, 1); //make a fileobject and store list and the index of that list in a c string ifstream file (list[index].c_str() ); //Make another string //string line; points.push_back(Point()); Point p; int face[4]; Model rendering code: int numfloats = 4; float* point=reinterpret_cast<float*>(&points[0]); int num_bytes=numfloats*sizeof(float); cout << "Size Of Point" << sizeof(Point) << endl; GLuint vertexbuffer; glGenVertexArrays(1, &vao[3]); glGenBuffers(1, &vertexbuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glBufferData(GL_ARRAY_BUFFER, points.size()*sizeof(points), points.data(), GL_STATIC_DRAW); glVertexAttribPointer(0, 3, GL_FLOAT, GL_FALSE, num_bytes, &points[0]); glEnableClientState(GL_VERTEX_ARRAY); glVertexPointer(3, GL_FLOAT, points.size(), &points[0]); glEnableClientState(GL_INDEX_ARRAY); glIndexPointer(GL_FLOAT, faces.size(), faces.data()); glEnableVertexAttribArray(0); glDrawElements(GL_QUADS, points.size(), GL_UNSIGNED_INT, points.data()); glDrawElements(GL_QUADS, faces.size(), GL_UNSIGNED_INT, faces.data());

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• How can I render a semi transparent model with OpenGL correctly?

  - by phobitor

  I'm using OpenGL ES 2 and I want to render a simple model with some level of transparency. I'm just starting out with shaders, and I wrote a simple diffuse shader for the model without any issues but I don't know how to add transparency to it. I tried to set my fragment shader's output (gl_FragColor) to a non opaque alpha value but the results weren't too great. It sort of works, but it looks like certain model triangles are only rendered based on the camera position... It's really hard to describe what's wrong so please watch this short video I recorded: http://www.youtube.com/watch?v=s0JqA0rZabE I thought this was a depth testing issue so I tried playing around with enabling/disabling depth testing and back face culling. Enabling back face culling changes the output slightly but the problem in the video is still there. Enabling/disabling depth testing doesn't seem to do anything. Could anyone explain what I'm seeing and how I can add some simple transparency to my model with the shader? I'm not looking for advanced order independent transparency implementations. edit: Vertex Shader: // color varying for fragment shader varying mediump vec3 LightIntensity; varying highp vec3 VertexInModelSpace; void main() { // vec4 LightPosition = vec4(0.0, 0.0, 0.0, 1.0); vec3 LightColor = vec3(1.0, 1.0, 1.0); vec3 DiffuseColor = vec3(1.0, 0.25, 0.0); // find the vector from the given vertex to the light source vec4 vertexInWorldSpace = gl_ModelViewMatrix * vec4(gl_Vertex); vec3 normalInWorldSpace = normalize(gl_NormalMatrix * gl_Normal); vec3 lightDirn = normalize(vec3(LightPosition-vertexInWorldSpace)); // save vertexInWorldSpace VertexInModelSpace = vec3(gl_Vertex); // calculate light intensity LightIntensity = LightColor * DiffuseColor * max(dot(lightDirn,normalInWorldSpace),0.0); // calculate projected vertex position gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex; } Fragment Shader: // varying to define color varying vec3 LightIntensity; varying vec3 VertexInModelSpace; void main() { gl_FragColor = vec4(LightIntensity,0.5); }

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• MVVM pattern and nested view models - communication and lookup lists

  - by LostInWPF

  I am using Prism for a new application that I am creating. There are several lookup lists that will be used in several places in the application. Therefore it makes sense to define it once and use that everywhere I need that functionality. My current solution is to use typed data templates to render the controls inside a content control. <DataTemplate DataType={x:Type ListOfCountriesViewModel}> <ComboBox ItemsSource={Binding Countries} SelectedItem="{Binding SelectedCountry"/> </DataTemplate> <DataTemplate DataType={x:Type ListOfRegionsViewModel}> <ComboBox ItemsSource={Binding Countries} SelectedItem={Binding SelectedRegion} /> </DataTemplate> public class ParentViewModel { SelectedCountry get; set; SelectedRegion get; set; ListOfCountriesViewModel CountriesVM; ListOfRegionsViewModel RgnsVM; } Then in my window I have 2 content controls and the rest of the controls <ContentControl Content="{Binding CountriesVM}"></ContentControl> <ContentControl Content="{Binding RgnsVM}"></ContentControl> <Rest of controls on view> At the moment I have this working and the SelectedItems for the combo boxes are publising events via EventAggregator from the child view models which are then subscribed to in the parent view model. I am not sure that this is the best way to go as I can imagine I would end up with a lot of events very quickly and it will become unwieldy. Also if I was to use the same view model on another window it will publish the event and this parent viewmodel is subscribed to it which could have unintended consequences. My questions are :- Is this the best way to put lookup lists in a view which can be re-used across screens? How do I make it so that the combobox which is bound to the child viewmodel sets the relevant property on the parent viewmodel without using events / mediator. e.g in this case SelectedCountry for example? Any alternative implementation proposals for what I am trying to do? I have a feeling I am missing something obvious and there is so much info it is hard to know what is right so any help would be most gratefully received.

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• Memory leak on CollectionView.View.Refresh

  - by Dabblernl

  I have defined my binding thus: <TreeView ItemsSource="{Binding UsersView.View}" ItemTemplate="{StaticResource MyDataTemplate}" /> The CollectionViewSource is defined thus: private ObservableCollection<UserData> users; public CollectionViewSource UsersView{get;set;} UsersView=new CollectionViewSource{Source=users}; UsersView.SortDescriptions.Add( new SortDescription("IsLoggedOn",ListSortDirection.Descending); UsersView.SortDescriptions.Add( new SortDescription("Username",ListSortDirection.Ascending); So far, so good, this works as expected: The view shows first the users that are logged on in alphabetical order, then the ones that are not. However, the IsLoggedIn property of the UserData is updated every few seconds by a backgroundworker thread and then the code calls: UsersView.View.Refresh(); on the UI thread. Again this works as expected: users that log on are moved from the bottom of the view to the top and vice versa. However: Every time I call the Refresh method on the view the application hoards 3,5MB of extra memory, which is only released after application shutdown (or after an OutOfMemoryException...) I did some research and below is a list of fixes that did NOT work: The UserData class implements INotifyPropertyChanged Changing the underlying users collection does not make any difference at all: any IENumerable<UserData as a source for the CollectionViewSource causes the problem. -Changing the ColletionViewSource to a List<UserData (and refreshing the binding) or inheriting from ObservableCollection to get access to the underlying Items collection to sort that in place does not work. I am out of ideas! Help? EDIT: I found it: The Resource MyDataTemplate contains a Label that is bound to a UserData object to show one of its properties, the UserData objects being handed down by the TreeView's ItemsSource. The Label has a ContextMenu defined thus: <ContextMenu Background="Transparent" Width="325" Opacity=".8" HasDropShadow="True"> <PrivateMessengerUI:MyUserData IsReadOnly="True" > <PrivateMessengerUI:MyUserData.DataContext> <Binding Path="."/> </PrivateMessengerUI:MyUserData.DataContext> </PrivateMessengerUI:MyUserData> </ContextMenu> The MyUserData object is a UserControl that shows All properties of the UserData object. In this way the user first only sees one piece of data of a user and on a right click sees all of it. When I remove the MyUserData UserControl from the DataTemplate the memory leak disappears! How can I still implement the behaviour as specified above?

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• Cancel UITouch Events When View Covered By Modal UIViewController

  - by kkrizka

  Hi there, I am writing an application where the user has to move some stuff on the screen using his fingers and drop them. To do this, I am using the touchesBegan,touchesEnded... function of each view that has to be moved. The problem is that sometimes the views are covered by a view displayed using the [UIViewController presentModalViewController] function. As soon as that happens, the UIView that I was moving stops receiving the touch events, since it was covered up. But there is no event telling me that it stopped receiving the events, so I can reset the state of the moved view. The following is an example that demonstrates this. The functions are part of a UIView that is being shown in the main window. It listens to touch events and when I drag the finger for some distance, it presents a modal view that covers everything. In the Run Log, it prints what touch events are received. - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesBegan"); touchStart=[[touches anyObject] locationInView:self]; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { CGPoint touchAt=[[touches anyObject] locationInView:self]; float xx=(touchAt.x-touchStart.x)*(touchAt.x-touchStart.x); float yy=(touchAt.y-touchStart.y)*(touchAt.y-touchStart.y); float rr=xx+yy; NSLog(@"touchesMoved %f",rr); if(rr > 100) { NSLog(@"Show modal"); [viewController presentModalViewController:[UIViewController new] animated:NO]; } } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesEnded"); } - (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event { NSLog(@"touchesCancelled"); } But when I test the application and trigger the modal dialog to be displayed, the following is the output in the Run Log. [Session started at 2010-03-27 16:17:14 -0700.] 2010-03-27 16:17:18.831 modelTouchCancel[2594:207] touchesBegan 2010-03-27 16:17:19.485 modelTouchCancel[2594:207] touchesMoved 2.000000 2010-03-27 16:17:19.504 modelTouchCancel[2594:207] touchesMoved 4.000000 2010-03-27 16:17:19.523 modelTouchCancel[2594:207] touchesMoved 16.000000 2010-03-27 16:17:19.538 modelTouchCancel[2594:207] touchesMoved 26.000000 2010-03-27 16:17:19.596 modelTouchCancel[2594:207] touchesMoved 68.000000 2010-03-27 16:17:19.624 modelTouchCancel[2594:207] touchesMoved 85.000000 2010-03-27 16:17:19.640 modelTouchCancel[2594:207] touchesMoved 125.000000 2010-03-27 16:17:19.641 modelTouchCancel[2594:207] Show modal Any suggestions on how to reset the state of a UIView when its touch events are interrupted by a modal view?

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• Multiple View App shows Blank Screen in Simulator

  - by Brett Coburn

  Hello; I am developing a simple app that first shows a menu screen, and when a button is pressed, a game screen appears. I was able to develop the game screen without any issues, but when I changed the code to first display the menu, the simulator showed a blank screen. I've read all the articles on connecting views with IB but I can't figure this out. Any help would be appreciated. This is my code: // Pong_Multiple_ViewAppDelegate.h // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright __MyCompanyName__ 2010. All rights reserved. // #import <UIKit/UIKit.h> @class MenuViewController; @interface Pong_Multiple_ViewAppDelegate : NSObject <UIApplicationDelegate> { UIWindow *window; MenuViewController *navigationController; } @property (nonatomic, retain) IBOutlet UIWindow *window; @property (nonatomic, retain) IBOutlet MenuViewController *navigationController; @end // // Pong_Multiple_ViewAppDelegate.m // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright __MyCompanyName__ 2010. All rights reserved. // #import "Pong_Multiple_ViewAppDelegate.h" #import "MenuViewController.h" @implementation Pong_Multiple_ViewAppDelegate @synthesize window; @synthesize navigationController; - (void)application:(UIApplication *)application{ // Override point for customization after application launch [window addSubview:[navigationController view]]; [window makeKeyAndVisible]; } - (void)dealloc { [navigationController release]; [window release]; [super dealloc]; } @end // // MenuViewController.h // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import <UIKit/UIKit.h> #import "GameViewController.h" @interface MenuViewController : UIViewController { GameViewController *gameViewController; IBOutlet UIButton *gameButton; } @property(nonatomic, retain) GameViewController *gameViewController; @property(nonatomic, retain) UIButton *gameButton; -(IBAction)switchPage:(id)sender; @end // // MenuViewController.m // Pong Multiple View // // Created by Brett on 10-05-19. // Copyright 2010 __MyCompanyName__. All rights reserved. // #import "MenuViewController.h" #import "GameViewController.h" @implementation MenuViewController @synthesize gameViewController; @synthesize gameButton; -(IBAction)switchPage:(id)sender{ if (self.gameViewController==nil) { GameViewController *gameView = [[GameViewController alloc]initWithNibName:@"GameView" bundle:[NSBundle mainBundle]]; self.gameViewController= gameView; [gameView release]; } [self.navigationController pushViewController:self.gameViewController animated:YES]; } .... @end My code also includes classes: GameViewController.h, GameViewController.m, and nib files: MenuView.xib, and GameView.xib Thanks, B

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• Problem with Landscape and Portrait view in a TabBar Application

  - by JoshD

  I have an TabBar app that I would like to be in landscape and portrait. The issue is when I go to tab 2 make a selection from my table then select tab 1 and rotate the device, then select tab 2 again the content does not know that the device rotated and will not display my custom orientated content correctly. I am trying to write a priovate method that tells the view what orientation it is currently in. IN viewDidLoad I am assuming it is in portrait but in shouldAutoRotate I have it looking in the private method for the correct alignment of the content. Please Help!! Here is my code: #import "DetailViewController.h" #import "ScheduleTableViewController.h" #import "BrightcoveDemoAppDelegate.h" #import "Constants.h" @implementation DetailViewController @synthesize CurrentLevel, CurrentTitle, tableDataSource,logoName,showDescription,showDescriptionInfo,showTime, showTimeInfo, tableBG; - (void)layoutSubviews { showLogo.frame = CGRectMake(40, 20, 187, 101); showDescription.frame = CGRectMake(85, 140, 330, 65); showTime.frame = CGRectMake(130, 10, 149, 119); tableBG.frame = CGRectMake(0, 0, 480, 320); } /* // The designated initializer. Override if you create the controller programmatically and want to perform customization that is not appropriate for viewDidLoad. - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil { if (self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]) { // Custom initialization } return self; } */ /* // Implement loadView to create a view hierarchy programmatically, without using a nib. - (void)loadView { } */ // Implement viewDidLoad to do additional setup after loading the view, typically from a nib. - (void)viewDidLoad { [super viewDidLoad]; self.navigationItem.title = CurrentTitle; [showDescription setEditable:NO]; //show the description showDescription.text = showDescriptionInfo; showTime.text = showTimeInfo; NSString *Path = [[NSBundle mainBundle] bundlePath]; NSString *ImagePath = [Path stringByAppendingPathComponent:logoName]; UIImage *tempImg = [[UIImage alloc] initWithContentsOfFile:ImagePath]; [showLogo setImage:tempImg]; [tempImg release]; [self masterView]; } - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation { return YES; } - (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration { isLandscape = UIInterfaceOrientationIsLandscape(toInterfaceOrientation); if(isLandscape = YES){ [self layoutSubviews]; } } - (void)didReceiveMemoryWarning { // Releases the view if it doesn't have a superview. [super didReceiveMemoryWarning]; // Release any cached data, images, etc that aren't in use. } - (void)viewDidUnload { // Release any retained subviews of the main view. // e.g. self.myOutlet = nil; } - (void)dealloc { [logoName release]; [showLogo release]; [showDescription release]; [showDescriptionInfo release]; [super dealloc]; } @end

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• Showing ImageView next to TextView in a ListView

  - by KDEx

  So I have a listview that is displaying correctly. When the item is "turned on" the text is white and when it's turned off it's grey. That part all functions great. However when I add the ImageView into the mix I get a null pointer exception. I don't understand why. I've tried using bitmaps as well and get the same problem. Here is some code: @Override public void bindView(View view, Context context, Cursor cursor) { TextView rRule = (TextView) view.findViewById(R.id.rule_text); TextView rType = (TextView) view.findViewById(R.id.rule_type); ImageView iChecked = (ImageView) view.findViewById(R.id.checkBox); String ruleName = cursor.getString(1); int ruleType = cursor.getInt(2); String ruleEnabled = cursor.getString(3); switch (ruleType) { /*...some irrelevant code */ } if (ruleEnabled.equals("true")) { rRule.setTypeface(null, Typeface.BOLD); rRule.setTextColor(Color.WHITE); iChecked.setVisibility(View.VISIBLE); //line 271 } else if (ruleEnabled.equals("false")) { rRule.setTypeface(null, Typeface.NORMAL); rRule.setTextColor(Color.GRAY); iChecked.setVisibility(View.GONE); } rRule.setText(ruleName); } Per request the error log: (Sorry was under the impression null pointers dont say anything helpful..I know the error is the imageview) 06-29 10:29:02.777: E/AndroidRuntime(29516): FATAL EXCEPTION: main 06-29 10:29:02.777: E/AndroidRuntime(29516): java.lang.NullPointerException 06-29 10:29:02.777: E/AndroidRuntime(29516): at com.company.app.DefaultRulesList$RulesAdapter.bindView(DefaultRulesList.java:271) 06-29 10:29:02.777: E/AndroidRuntime(29516): at com.company.app.DefaultRulesList$RulesAdapter.newView(DefaultRulesList.java:284) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.CursorAdapter.getView(CursorAdapter.java:246) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.AbsListView.obtainView(AbsListView.java:2033) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.makeAndAddView(ListView.java:1772) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.fillDown(ListView.java:672) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.fillFromTop(ListView.java:732) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.ListView.layoutChildren(ListView.java:1625) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.AbsListView.onLayout(AbsListView.java:1863) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.setChildFrame(LinearLayout.java:1628) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.layoutVertical(LinearLayout.java:1486) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.LinearLayout.onLayout(LinearLayout.java:1399) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.widget.FrameLayout.onLayout(FrameLayout.java:431) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.View.layout(View.java:11278) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewGroup.layout(ViewGroup.java:4224) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1489) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.view.ViewRootImpl.handleMessage(ViewRootImpl.java:2442) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.os.Handler.dispatchMessage(Handler.java:99) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.os.Looper.loop(Looper.java:137) 06-29 10:29:02.777: E/AndroidRuntime(29516): at android.app.ActivityThread.main(ActivityThread.java:4424) 06-29 10:29:02.777: E/AndroidRuntime(29516): at java.lang.reflect.Method.invokeNative(Native Method) 06-29 10:29:02.777: E/AndroidRuntime(29516): at java.lang.reflect.Method.invoke(Method.java:511) 06-29 10:29:02.777: E/AndroidRuntime(29516): at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:784) 06-29 10:29:02.777: E/AndroidRuntime(29516): at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:551) 06-29 10:29:02.777: E/AndroidRuntime(29516): at dalvik.system.NativeStart.main(Native Method) Code for iChecked (where the id is called) <ImageView android:id="@+id/checkBox" android:padding="2dip" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@android:drawable/checkbox_on_background"/>

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• How accurate is "Business logic should be in a service, not in a model"?

  - by Jeroen Vannevel

  Situation Earlier this evening I gave an answer to a question on StackOverflow. The question: Editing of an existing object should be done in repository layer or in service? For example if I have a User that has debt. I want to change his debt. Should I do it in UserRepository or in service for example BuyingService by getting an object, editing it and saving it ? My answer: You should leave the responsibility of mutating an object to that same object and use the repository to retrieve this object. Example situation: class User { private int debt; // debt in cents private string name; // getters public void makePayment(int cents){ debt -= cents; } } class UserRepository { public User GetUserByName(string name){ // Get appropriate user from database } } A comment I received: Business logic should really be in a service. Not in a model. What does the internet say? So, this got me searching since I've never really (consciously) used a service layer. I started reading up on the Service Layer pattern and the Unit Of Work pattern but so far I can't say I'm convinced a service layer has to be used. Take for example this article by Martin Fowler on the anti-pattern of an Anemic Domain Model: There are objects, many named after the nouns in the domain space, and these objects are connected with the rich relationships and structure that true domain models have. The catch comes when you look at the behavior, and you realize that there is hardly any behavior on these objects, making them little more than bags of getters and setters. Indeed often these models come with design rules that say that you are not to put any domain logic in the the domain objects. Instead there are a set of service objects which capture all the domain logic. These services live on top of the domain model and use the domain model for data. (...) The logic that should be in a domain object is domain logic - validations, calculations, business rules - whatever you like to call it. To me, this seemed exactly what the situation was about: I advocated the manipulation of an object's data by introducing methods inside that class that do just that. However I realize that this should be a given either way, and it probably has more to do with how these methods are invoked (using a repository). I also had the feeling that in that article (see below), a Service Layer is more considered as a façade that delegates work to the underlying model, than an actual work-intensive layer. Application Layer [his name for Service Layer]: Defines the jobs the software is supposed to do and directs the expressive domain objects to work out problems. The tasks this layer is responsible for are meaningful to the business or necessary for interaction with the application layers of other systems. This layer is kept thin. It does not contain business rules or knowledge, but only coordinates tasks and delegates work to collaborations of domain objects in the next layer down. It does not have state reflecting the business situation, but it can have state that reflects the progress of a task for the user or the program. Which is reinforced here: Service interfaces. Services expose a service interface to which all inbound messages are sent. You can think of a service interface as a façade that exposes the business logic implemented in the application (typically, logic in the business layer) to potential consumers. And here: The service layer should be devoid of any application or business logic and should focus primarily on a few concerns. It should wrap Business Layer calls, translate your Domain in a common language that your clients can understand, and handle the communication medium between server and requesting client. This is a serious contrast to other resources that talk about the Service Layer: The service layer should consist of classes with methods that are units of work with actions that belong in the same transaction. Or the second answer to a question I've already linked: At some point, your application will want some business logic. Also, you might want to validate the input to make sure that there isn't something evil or nonperforming being requested. This logic belongs in your service layer. "Solution"? Following the guidelines in this answer, I came up with the following approach that uses a Service Layer: class UserController : Controller { private UserService _userService; public UserController(UserService userService){ _userService = userService; } public ActionResult MakeHimPay(string username, int amount) { _userService.MakeHimPay(username, amount); return RedirectToAction("ShowUserOverview"); } public ActionResult ShowUserOverview() { return View(); } } class UserService { private IUserRepository _userRepository; public UserService(IUserRepository userRepository) { _userRepository = userRepository; } public void MakeHimPay(username, amount) { _userRepository.GetUserByName(username).makePayment(amount); } } class UserRepository { public User GetUserByName(string name){ // Get appropriate user from database } } class User { private int debt; // debt in cents private string name; // getters public void makePayment(int cents){ debt -= cents; } } Conclusion All together not much has changed here: code from the controller has moved to the service layer (which is a good thing, so there is an upside to this approach). However this doesn't look like it had anything to do with my original answer. I realize design patterns are guidelines, not rules set in stone to be implemented whenever possible. Yet I have not found a definitive explanation of the service layer and how it should be regarded. Is it a means to simply extract logic from the controller and put it inside a service instead? Is it supposed to form a contract between the controller and the domain? Should there be a layer between the domain and the service layer? And, last but not least: following the original comment Business logic should really be in a service. Not in a model. Is this correct? How would I introduce my business logic in a service instead of the model?

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• Android 1.6: "android.view.WindowManager$BadTokenException: Unable to add window -- token null is no

  - by Dan Monego

  I'm trying to open a dialog window, but every time I try to open it it throws this exception: E/AndroidRuntime( 206): Uncaught handler: thread main exiting due to uncaught exception E/AndroidRuntime( 206): android.view.WindowManager$BadTokenException: Unable to add window -- token null is not for an application E/AndroidRuntime( 206): at android.view.ViewRoot.setView(ViewRoot.java:460) E/AndroidRuntime( 206): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:177) E/AndroidRuntime( 206): at android.view.WindowManagerImpl.addView(WindowManagerImpl.java:91) E/AndroidRuntime( 206): at android.app.Dialog.show(Dialog.java:238) E/AndroidRuntime( 206): at android.app.Activity.showDialog(Activity.java:2413) I'm creating it by calling showDialog with the display's id. The onCreateDialog handler logs fine and I can step through it without an issue, but I've attached since it seems like I'm missing something in it: @Override public Dialog onCreateDialog(int id) { Dialog dialog; Context appContext = this.getApplicationContext(); switch(id) { case RENAME_DIALOG_ID: Log.i("Edit", "Creating rename dialog..."); dialog = new Dialog(appContext); dialog.setContentView(R.layout.rename); dialog.setTitle("Rename " + noteName); break; default: dialog = null; break; } return dialog; } Is there something missing from this? Some questions have talked about having this problem when creating a dialog from onCreate, which happen because the activity isn't created yet, but this is coming from a call from a menu object, and the appContext variable seems like it is correctly populated in the debugger.

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• Android: How to bind spinner to custom object list?

  - by niko

  Hi, In the user interface there has to be a spinner which contains some names (the names are visible) and each name has its own ID (the IDs are not equal to display sequence). When the user selects the name from the list the variable currentID has to be changed. The application contains the ArrayList Where User is an object with ID and name: public class User{ public int ID; public String name; } What I don't know is how to create a spinner which displays the list of user's names and bind spinner items to IDs so when the spinner item is selected/changed the variable currentID is set to appropriate value. I would appreciate if anyone could show the solution of the described problem or provide any link useful to solve the problem. Thanks!

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• In an iPad SplitView, how do I add a Date Picker control to the Root View?

  - by Dr Dork

  I'm diving into iPhone OS development on the iPad and one of the things I'm playing with is the SplitView template. The template provides a window with a UISplitView view, containing the Root View (on the left of the window) and the Detail View (on the right of the window). The Root View is a subclass of a TableView. Rather than having the entire Root View consist of a TableView, I'd like it to contain a DatePicker view along with the TableView under it. When I go into IB and try and drop a DatePicker into the Root View, it won't let me. It will only let me add a DatePicker view to the Detail View. Why wont IB let me drop a DatePicker view into the Root View? How can I add a DatePicker to the RootView in addition to the TableView? I'm still learning this new platform, so I apologize if these questions are absurd in any way. Thanks so much in advance for your help, I'm going to continue researching these questions right now.

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• In the Xcode SplitView template for an iPad app, how do I add a Date Picker control to the Root View

  - by Dr Dork

  I'm diving into iPhone OS development on the iPad and one of the things I'm playing with is the SplitView template. The template provides a window with a UISplitView view, containing the Root View (on the left of the window) and the Detail View (on the right of the window). The Root View is a subclass of a TableView. Rather than having the entire Root View consist of a TableView, I'd like it to contain a DatePicker view along with the TableView under it. When I go into IB and try and drop a DatePicker into the Root View, it won't let me. It will only let me add a DatePicker view to the Detail View. Why wont IB let me drop a DatePicker view into the Root View? How can I add a DatePicker to the RootView in addition to the TableView? I'm still learning this new platform, so I apologize if these questions are absurd in any way. Thanks so much in advance for your help, I'm going to continue researching these questions right now.

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• Iphone xCode - Navigation Controller on second xib view?

  - by Frames84

  Everything is fine, my navigation controller display's my 'Menu 1' item, but when i click it there appears to be a problem with the: [self.navigationController pushViewController:c animated:YES]; line it doesn't connect to the break point in the myClass file. so I think i've not joined something? but unsure what? my second view with the navigation controller doesn't have direct access to the AppDelegate so can't join it like i see in some tutorials. 1st view is just a button when clicked calls: [self presentModalViewController:mainViewController animated:YES]; my second View 'MainViewController' header looks like: @interface MainViewController :UITableViewController <UITableViewDelegate, UITableViewDataSource> { NSArray *controllers; UINavigationController *navController; } @property (nonatomic, retain) IBOutlet UINavigationController *navControllers; @property (nonatomic, retain) NSArray *controller; Then I have my MainViewController.m @synthesize controllers; @synthesize navController; - (void) viewDidLoad { NSMutableArray *array = [[NSMutaleArray alloc] init]; myClass *c = [[myClass alloc] initWithStyle:UITableViewStylePlain]; c.Title = @"Menu 1"; [array addObject:c]; self.Controllers = array; [array release]; } implemented numberOfRowsInSection and cellForRowAtIndexPath - (void) tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { NSUInteger row = [indexPath row]; myClass *c = [self.controllers objectAtIndex:row]; [self.navigationController pushViewController:c animated:YES]; // doesn't load myClass c // [self.navController pushViewController:c animated:YES]; } Also in interface designer I dragged a Navigation Controller onto my new XIB and changed the Root View Controller class to MainViewController and also connected the File Owner connector to the Navigation Controller to connect the navController Outlet. Thanks for you time.

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• What is the standard convention for defining nested view:viewmodel mapping in MVVM Light

  - by firoso

  so in classic MVVM examples ive seen DataTemplate definitions are used to map up View Models to Views, what is the standard way to do this in MVVM Light framework, and where should the mappings be located? Following are examples of what I'm doing now and what I'm talking about, blendability is important to me! Main Window: <Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="STS2Editor.MainWindow" Title="{Binding ApplicationTitle, Mode=OneWay}" DataContext="{Binding RootViewModel, Source={StaticResource Locator}}"> <Window.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Skins/ApplicationSkin.xaml" /> <ResourceDictionary Source="Resources/ViewMappings.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary> </Window.Resources> <Grid> <ContentControl Content="{Binding ApplicationManagementViewModel}" HorizontalAlignment="Left" VerticalAlignment="Top"/> </Grid> </Window> In the above code, my RootViewModel class has an instance of the class ApplicationManagementViewModel with the same property name: public ApplicationManagementViewModel ApplicationManagementViewModel {get {...} set {...} } I reference the ResourceDictionary "ViewMappings.xaml" to specify how my view model is represented as a view. <ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:STS2Editor.ViewModel"> <DataTemplate DataType="{x:Type local:ApplicationManagementViewModel}"> <local:ApplicationManagementView/> </DataTemplate> </ResourceDictionary> should I be doing things like this using ViewModelLocator? what about collections of view models?

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• rspec & rails 3 cannot find model object

  - by Ceilingfish

  I'm trying to put some specs around a new rails 3 project I am working on, and my first test doesn't seem to be able to find a model. I've installed rspec from the command line using: sudo gem install rspec --pre and then I put the following in my Gemfile gem "rspec-rails", ">= 2.0.0.beta.1" But when I run my test I get ./spec/models/world_spec.rb:1: uninitialized constant World (NameError) rake aborted! Command /opt/local/bin/ruby -Ilib -Ispec "./spec/models/world_spec.rb" failed /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:71:in `define' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1112:in `verbose' /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:57:in `send' /opt/local/lib/ruby/gems/1.8/gems/rspec-core-2.0.0.beta.4/lib/rspec/core/rake_task.rb:57:in `define' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `call' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:636:in `execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `each' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:631:in `execute' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:597:in `invoke_with_call_chain' /opt/local/lib/ruby/1.8/monitor.rb:242:in `synchronize' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:590:in `invoke_with_call_chain' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:583:in `invoke' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2051:in `invoke_task' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `each' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2029:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2023:in `top_level' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2001:in `run' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:2068:in `standard_exception_handling' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/lib/rake.rb:1998:in `run' /opt/local/lib/ruby/gems/1.8/gems/rake-0.8.7/bin/rake:31 /opt/local/bin/rake:19:in `load' /opt/local/bin/rake:19 My spec is in spec/models/world_spec.rb, and looks like describe World, "#hello" do it "should be invalid" do World.new.should be_invalid? end end I tried adding a line like require "app/model/world" and require "world" but to no success. Does anyone know what I'm doing wrong?

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• Notifying view controller when subview touch events occur.

  - by Nebs

  I have a UIViewController whose view has a custom subview. This custom subview needs to track touch events and report swipe gestures. Currently I put touchesBegan, touchesMoved, touchesEnded and touchesCancelled in the subview class. With some extra logic I am able to get swipe gestures and call my handleRightSwipe and handleLeftSwipe methods. So now when I swipe within the subview it calls its local swipe handling methods. This all works fine. But what I really need is for the handleRightSwipe and handleLeftSwipe methods to be in the view controller. I could leave them in the subview class but then I'd have to bring in all the logic and data as well and that kind of breaks the MVC idea. So my question is is there a clean way to handle this? Essentially I want to keep my touch event methods in the subview so that they only trigger for that specific view. But I also want the view controller to be informed when these touch events (or in this case swipe gestures) occur. Any ideas? Thanks.

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• Force "2005" for ProviderManifestToken in EF Data Model.

  - by ProfK

  Every time I update my data model, it makes this value 2008, breaking the 2005 server deployment. Is their anything besides a build action I can use to stop this?

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• How to Put Javascript into an ASP.NET MVC View

  - by Maxim Z.

  I'm really new to ASP.NET MVC, and I'm trying to integrate some Javascript into a website I'm making as a test of this technology. My question is this: how can I insert Javascript code into a View? Let's say that I start out with the default ASP.NET MVC template. In terms of Views, this creates a Master page, a "Home" View, and an "About" view. The "Home" View, called Index.aspx, looks like this: <%@ Page Language="C#" MasterPageFile="~/Views/Shared/Site.Master" Inherits="System.Web.Mvc.ViewPage" %> <asp:Content ID="indexTitle" ContentPlaceHolderID="TitleContent" runat="server"> Home Page </asp:Content> <asp:Content ID="indexContent" ContentPlaceHolderID="MainContent" runat="server"> <h2><%= Html.Encode(ViewData["Message"]) %></h2> <p> To learn more about ASP.NET MVC visit <a href="http://asp.net/mvc" title="ASP.NET MVC Website">http://asp.net/mvc</a>. </p> <p>Welcome to this testing site!</p> </asp:Content> Adding a <script> tag here didn't work. Where and how should I do it? P.S.: I have a feeling I'm missing something very basic... Thanks in advance!

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• Android: Filtering a SimpleCursorAdapter ListView

  - by Diego Tori

  Right now, I'm running into issues trying to implement a FilterQueryProvider in my custom SimpleCursorAdapter, since I'm unsure of what to do in the FilterQueryProvider's runQuery function. In other words, since the query that comprises my ListView basically gets the rowID, name, and a third column from my databases's table, I want to be able to filter the cursor based on the partial value of the name column. However, I am uncertain of whether I can do this directly from runQuery without expanding my DB class since I want to filter the existing cursor, or will I have to create a new query function in my DB class that partially searches my name column, and if so, how would I go about creating the query statement while using the CharSequence constraint argument in runQuery? I am also concerned about the performance issues associated with trying to run multiple queries based on partial text since the DB table in question has about 1300-1400 rows. In other words, would I run into a bottleneck trying to filter the cursor?

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• Django and ImageField Question

  - by Hellnar

  Hello I have a such model: Foo (models.Model): slug = models.SlugField(unique=True) image = models.ImageField(upload_to='uploads/') I want to do two things with this: First of all, I want my image to be forced to resize to a specific width and height after the upload. I have tried this reading the documentation but seems to getting error: image = models.ImageField(upload_to='uploads/', height_field=258, width_field=425) Secondly, when adding an item via admin panel, I want my image's file name to be renamed as same as slug, if any issue arises (like if such named image already exists, add "_" to the end as it used to do. IE: My slug is i-love-you-guys , uploaded image such have i-love-you-guys.png at the end.

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• Android GridView - update View based on position

  - by Chris

  I have a GridView, using a custom adapter (myAdapter extends BaseAdapter), where each item in the grid holds an ImageButton. getView() is working fine. However, from elsewhere in my code, how can I update the image (setImageResource) for one particular item in the grid based on its position in the GridView? So far, I've added this to my adapter class: public void changeImage() { Log.d(TAG, "Image change"); this.ImageButton.setImageResource(R.drawable.newImage); } And would like to write something like this: mygridview.getItemIdAtPosition(20).changeImage(); (doesn't compile).

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