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  • Finding the closest object in proxmity to the mouse Coordinates

    - by Cam
    Hey there, i've been working on a problem for a while now, which involves targeting the closest movieClip in relation to the x y coords of the mouse, I've attached a nice little acompanying graphic. Each mc added to the stage has it's own sub-class (HotSpots) which uses Pythag to measure distance from mouse. At this stage i can determine the closest value from my Main class but can't figure out how to reference it back to the movieclip... hope this makes sense. Below are the two Classes. My Main Class which attachs the mcs, and monitors mouse movement and traces closest value package { import flash.display.*; import flash.text.*; import flash.events.*; public class Main extends MovieClip { var pos:Number = 50; var nodeArray:Array; public function Main(){ nodeArray = []; for(var i:int = 0; i < 4; i++) { var hotSpot_mc:HotSpots = new HotSpots; hotSpot_mc.x += pos; hotSpot_mc.y += pos; addChild(hotSpot_mc); nodeArray.push(hotSpot_mc); // set some pos pos += 70; } stage.addEventListener(MouseEvent.MOUSE_MOVE,updateProxmity) } public function updateProxmity(e:MouseEvent):void { var tempArray:Array = new Array(); for(var i:int = 0; i < 4; i++) { this['tf'+[i]].text = String(nodeArray[i].dist); tempArray.push(nodeArray[i].dist); } tempArray.sort(Array.NUMERIC); var minValue:int = tempArray[0]; trace(minValue) } } } My HotSpots Class package { import flash.display.MovieClip; import flash.events.Event; import flash.text.TextField; public class HotSpots extends MovieClip { public var XSide:Number; public var YSide:Number; public var dist:Number = 0; public function HotSpots() { addEventListener(Event.ENTER_FRAME, textUp); } public function textUp(event:Event):void { XSide = this.x - MovieClip(root).mouseX; YSide = this.y - MovieClip(root).mouseY; dist = Math.round((Math.sqrt(XSide*XSide + YSide*YSide))); } } } thanks in advance

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  • is this possible in java or any other programming language

    - by drake
    public abstract class Master { public void printForAllMethodsInSubClass() { System.out.println ("Printing before subclass method executes"); } } public class Owner extends Master { public void printSomething () { System.out.println ("This printed from Owner"); } public int returnSomeCals () { return 5+5; } } Without messing with methods of subclass...is it possible to execute printForAllMethodsInSubClass() before the method of a subclass gets executed?

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  • LockMode With Subclasses

    - by Lester
    I'm using Fluent Nhibernate with the following query on DerivedClass which extends BaseClass: var query = Session.CreateCriteria<DerivedClass>().SetLockMode(LockMode.Upgrade) What I want is the lock hints (updlock, rowlock) to be applied to both DerivedClass and BaseClass, but the generated SQL only applies the lock hints to DerivedClass: SELECT * FROM DerivedClass this_ with (updlock, rowlock) inner join [BaseClass] this_1_ on this_.Id=this_1_.Id WHERE ... This is the same situation described in http://opensource.atlassian.com/projects/hibernate/browse/HHH-2392 If anyone could point me in the right direction it would be much appreciated.

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  • How do I apply a servlet filter when serving an HTML page directly?

    - by Philippe Beaudoin
    First off, I'm using Google AppEngine and Guice, but I suspect my problem is not related to these. When the user connect to my (GWT) webapp, the URL is a direct html page. For example, in development mode, it is: http://127.0.0.1:8888/Puzzlebazar.html?gwt.codesvr=127.0.0.1:9997. Now, I setup my web.xml in the following way: <?xml version="1.0" encoding="UTF-8"?> <web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" version="2.5"> <display-name>PuzzleBazar</display-name> <!-- Default page to serve --> <welcome-file-list> <welcome-file>Puzzlebazar.html</welcome-file> </welcome-file-list> <filter> <filter-name>guiceFilter</filter-name> <filter-class>com.google.inject.servlet.GuiceFilter</filter-class> </filter> <filter-mapping> <filter-name>guiceFilter</filter-name> <url-pattern>/*</url-pattern> </filter-mapping> <!-- This Guice listener hijacks all further filters and servlets. Extra filters and servlets have to be configured in your ServletModule#configureServlets() by calling serve(String).with(Class<? extends HttpServlet>) and filter(String).through(Class<? extends Filter) --> <listener> <listener-class>com.puzzlebazar.server.guice.MyGuiceServletContextListener </listener-class> </listener> </web-app> Since I'm using Guice, I have to configure extra filters in my ServletModule, where I do this: filter("*.html").through( SecurityCookieFilter.class ); But my SecurityCookieFilter.doFilter is never called. I tried things like "*.html*" or <url-pattern>*</url-pattern> but to no avail. Any idea how I should do this?

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  • Understanding SingleTableEntityPersister n QueryLoader

    - by Iapilgrim
    Hi, I have the Hibernate model @Cache(usage = CacheConcurrencyStrategy.NONE, region = SitesConstants.CACHE_REGION) public class Node extends StatefulEntity implements Inheritable, Cloneable { private Node _parent; private List<Node> _childNodes; .. } @Cache(usage = CacheConcurrencyStrategy.NONE, region = SitesConstants.CACHE_REGION) public class Page extends Node implements Defaultable, Securable { private RootZone _rootZone; ...... @OneToOne(fetch = FetchType.LAZY) @JoinColumn(name = "root_zone_id", insertable = false, updatable = false) public RootZone getRootZone() { return _rootZone; } public void setRootZone(RootZone rootZone) { if (rootZone != null) { rootZone.setPageId(this.getId()); _rootZone = rootZone; } } I want to get all pages ( call getSiteTree), so I using this query String hpql = "SELECT n FROM Node n "; See the trace I find Page.setRootZone(RootZone) line: 155 NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39 DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25 Method.invoke(Object, Object...) line: 597 BasicPropertyAccessor$BasicSetter.set(Object, Object, SessionFactoryImplementor) line: 66 PojoEntityTuplizer(AbstractEntityTuplizer).setPropertyValues(Object, Object[]) line: 352 PojoEntityTuplizer.setPropertyValues(Object, Object[]) line: 232 SingleTableEntityPersister(AbstractEntityPersister).setPropertyValues(Object, Object[], EntityMode) line: 3580 TwoPhaseLoad.initializeEntity(Object, boolean, SessionImplementor, PreLoadEvent, PostLoadEvent) line: 152 QueryLoader(Loader).initializeEntitiesAndCollections(List, Object, SessionImplementor, boolean) line: 877 QueryLoader(Loader).doQuery(SessionImplementor, QueryParameters, boolean) line: 752 QueryLoader(Loader).doQueryAndInitializeNonLazyCollections(SessionImplementor, QueryParameters, boolean) line: 259 QueryLoader(Loader).doList(SessionImplementor, QueryParameters) line: 2232 QueryLoader(Loader).listIgnoreQueryCache(SessionImplementor, QueryParameters) line: 2129 QueryLoader(Loader).list(SessionImplementor, QueryParameters, Set, Type[]) line: 2124 QueryLoader.list(SessionImplementor, QueryParameters) line: 401 QueryTranslatorImpl.list(SessionImplementor, QueryParameters) line: 363 HQLQueryPlan.performList(QueryParameters, SessionImplementor) line: 196 SessionImpl.list(String, QueryParameters) line: 1149 QueryImpl.list() line: 102 QueryImpl.getResultList() line: 67 NodeDaoImpl.getSiteTree(long) line: 358 PageNodeServiceImpl.getSiteTree(long) line: 797 NativeMethodAccessorImpl.invoke0(Method, Object, Object[]) line: not available [native method] NativeMethodAccessorImpl.invoke(Object, Object[]) line: 39 DelegatingMethodAccessorImpl.invoke(Object, Object[]) line: 25 Method.invoke(Object, Object...) line: 597 AopUtils.invokeJoinpointUsingReflection(Object, Method, Object[]) line: 307 JdkDynamicAopProxy.invoke(Object, Method, Object[]) line: 198 $Proxy100.getSiteTree(long) line: not available the calling setRootZone in Page makes Hibernate issue a hit to database. I don't want this. So my question is + Why query String hpql = "SELECT n FROM Node n "; issues un-expected trace logs like above. Why the query String hpql = "SELECT n.nodename FROM Node n " not? What is the mechanism behind? Note: Im using hibernate caching level 2. In case I don't want to see that trace logs. I mean I just get Node data only. How to do ? Thanks for your help. Sorry for my bad english :( Van

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  • Java class object from type variable

    - by Alexander Temerev
    Is there a way to get Class object from the type variable in Java generic class? Something like that: public class Bar extends Foo<T> { public Class getParameterClass() { return T.class; // doesn't compile } } This type information is available at compile time and therefore should not be affected by type erasure, so, theoretically, there should be a way to accomplish this. Does it exist?

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  • Extending Java Enums

    - by CaseyB
    Here's what I am looking to accomplish, I have a class that has an enum of some values and I want to subclass that and add more values to the enum. This is a bad example, but: public class Digits { public enum Digit { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9 } } public class HexDigits extends Digits { public enum Digit { A, B, C, D, E, F } } so that HexDigits.Digit contains all Hex Digits. Is that possible?

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  • SurfaceView for Camera Preview won't get destroyed when pressing Power-Botton

    - by for3st
    I want to implement a camera preview. For that I have a custom View CameraView extends ViewGroup that in the constructor programatically creates an surfaceView. I have the following components (higly simplified for beverity): ScannerFragment.java public View onCreateView(..) { //inflate view and get cameraView } public void onResume() { //open camera -> set rotation -> startPreview (in a thread) -> //set preview callback -> start decoding worker } public void onPause() { // stop decoding worker -> stop Preview -> release camera } CameraView.java extends ViewGroup public void setUpCalledInConstructor(Context context) { //create a surfaceview and add it to this viewgroup -> //get SurfaceHolder and set callback } /* SurfaceHolder.Callback */ public void surfaceCreated(SurfaceHolder holder) { camera.setPreviewDisplay(holder); } public void surfaceDestroyed(SurfaceHolder holder) { //NOTHING is done here } public void surfaceChanged(SurfaceHolder holder, int format, int w, int h) { camera.getParameters().setPreviewSize(previewSize.width, previewSize.height); } fragment_scanner.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent"> <com.myapp.camera.CameraView android:id="@+id/cameraPreview" android:layout_width="match_parent" android:layout_height="match_parent"/> </RelativeLayout> I think I have set the lifecycle correct (getting resources onResume(), releasing it onPause() roughly said) and the following works just fine: pressing home and returning pressing Taskswitcher and returning rotation But one thing doesn't work and that is when I press the power-button on the device and then return to the camera-preview. The result is: the preview is stuck with the image that was last captured before button was pressed. If I rotate it works fine again, since it will get through the lifecycle. After some research I found out that this is probably due to the fact that surfaceView won't get destroyed when the power-button is pressed, i.e. SurfaceHolder.Callback.surfaceDestroyed(SurfaceHolder holder) won't be called. And in fact when I compare the (very verbose) log output of the home-button-case and the power-button-case it's the same except that 'surfaceDestroyed' won't get called. So far I found no solution whatsoever to work around it. I purposely avoid any resource cleaning code in my surfaceDestroyed(), but this does not help. My idea was to manually destroy the surfaceView like asked in this question but this seems not possible. I also tested other applications with surfaceViews/cameras and they don't seem to have this issue. So I would appreciate any hints or tips on that.

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  • Delegating Struts action class management to Spring raises MTIA critical voilation in Findbugs

    - by shabeer
    When i use "Delegate Struts Action management to Spring" approach explained in http://www.ibm.com/developerworks/java/library/j-sr2.html#N101B7 things work fine in terms of functionality but findbugs reports following voilation Dodgy - Class extends Struts Action class and uses instance variables:MTIA I have bean dependencies injected into action class through spring . Please help me and suggest me a cleaner way to solve this problem. Thanks

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  • Android OnClick in ListView calling parent function

    - by user1321683
    I have an Android application with a ListView in it, the ListView will setup fine but now I want a image in the ListView to be clickable. I do this by using 2 classes, the Activity class (parent) and an ArrayAdapter to fill the list. In the ArrayAdapter I implement a OnClickListener for the image in the list that I want to be clickable. So far it all works. But now I want to run a function from the activity class when the onClick, for the image in the list, is run but I do not know how. Below are the 2 classes that I use. First the Activity class: public class parent_class extends Activity implements OnClickListener, OnItemClickListener { child_class_list myList; ListView myListView; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); // setup the Homelist data myList = new child_class_list (this, Group_Names, Group_Dates); myListView = (ListView) findViewById(R.id.list); // set the HomeList myListView.setAdapter( myList ); myListView.setOnItemClickListener(this); } void function_to_run() { // I want to run this function from the LiscView Onclick } public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { // do something } } And the ArrayAdapter from where I want to call a function from the Activity class: public class child_class_list extends ArrayAdapter<String> { // private private final Context context; private String[] mName; private String[] mDate; public child_class_list (Context context, String[] Name, String[] Date) { super(context, R.layout.l_home, GroupName); this.context = context; this.mName = Name; this.mDate = Date; } @Override public View getView(int position, View convertView, ViewGroup parent) { LayoutInflater inflater = (LayoutInflater) context .getSystemService(Context.LAYOUT_INFLATER_SERVICE); View rowView = inflater.inflate(R.layout.l_home, parent, false); ImageView selectable_image = (ImageView) rowView.findViewById(R.id.l_selectable_image); selectable_image.setOnClickListener(new OnClickListener() { public void onClick(View v) { // I want to run the function_to_run() function from the parant class here } } ); // get the textID's TextView tvName = (TextView) rowView.findViewById(R.id.l_name); TextView tvDate = (TextView) rowView.findViewById(R.id.l_date); // set the text tvName.setText (mName[position]); tvDate.setText (mDate[position]); return rowView; } } If anyone knows how to run the function in the activity class from the arrayadapter or how to set the image onClickListener in the Activity Class I would greatly apriciate the help.

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  • Rest API Web Service - iOS

    - by zeekerg
    Its my first time to use web service in iOS. REST was my first choice and I use code igniter to form it. I have my Controller: require APPPATH.'/libraries/REST_Controller.php'; class Sample extends REST_Controller { function example_get() { $this->load->helper('arh'); $this->load->model('users'); $users_array = array(); $users = $this->users->get_all_users(); foreach($users as $user){ $new_array = array( 'id'=>$user->id , 'name'=>$user->name, 'age'=>$user->age, ); array_push( $users_array, $new_array); } $data['users'] = $users_array; if($data) { $this->response($data, 200); } } function user_put() { $this->load->model('users'); $this->users->insertAUser(); $message = array('message' => 'ADDED!'); $this->response($message, 200); } } , using my web browser, accessing the URL http://localhost:8888/restApi/index.php/sample/example/format/json really works fine and gives this output: {"users":[{"id":"1","name":"Porcopio","age":"99"},{"id":"2","name":"Name1","age":"24"},{"id":"3","name":"Porcopio","age":"99"},{"id":"4","name":"Porcopio","age":"99"},{"id":"5","name":"Luna","age":"99"}]} , this gives me a great output using RKRequest by RestKit in my app. The problem goes with the put method. This URL : http://localhost:8888/restApi/index.php/sample/user always give me an error like this: This XML file does not appear to have any style information associated with it. The document tree is shown below. <xml> <status/> <error>Unknown method.</error> This is my Users model <?php class Users extends CI_Model { function __construct() { parent::__construct(); } function get_all_users() { $this->load->database(); $query = $this->db->get('users'); return $query->result(); } function insertAUser(){ $this->load->database(); $data = array('name'=> "Sample Name", 'age'=>"99"); $this->db->insert('users', $data); } } ?> What is the work around for my _put method why am I not inserting anything? Thanks all!

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  • JPopupMenu getParent() returning a null?

    - by Zenzen
    Ok so I'm working on an Eclipse plugin based on the JGraph example. The problem is I can't really get the "save" method to work, here's how the program works in short: - I have a DiagramEditor class with an init() method, where I create a GraphEditor object and call the createFrame() methord of that object. - GraphEditor extends the BasicGraphEditor (which extends JPanel), the createFrame() method returns a JFrame and has a line "frame.setJMenuBar(menuBar)" - the "menuBar" is an object variable, which is initialized in the BasicGraphEditor. Till here everything is cool, the problem is with the action listener which is supposed to save a file. To get the graph I need to get the GraphEditor component, so I do a Component component = (Component) e.getSource() whitch is the ActionEvent passed to that action listener and at that stage is the JMenuItem "save", then I get the parent which is the JPopupMenu, then I want to get that JPopupMenu's parent which should be the GraphEdiotor, but instead I get a null. Any idea why? Here's some source code: DiagramEditor.java: @Override public void init(IEditorSite site, IEditorInput input) throws PartInitException { setSite(site); setInput(input); this.diagram = ((DiagramEditorInput)input).getDiagram(); setPartName(this.diagram.getName()); gEditor = new GraphEditor(); gEditor.createFrame().setVisible(true); } BasicGraphEditor.java: public JFrame createFrame() { JFrame frame = new JFrame(); frame.getContentPane().add(this); frame.setJMenuBar(menuBar); //frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(870, 640); return frame; } In the constructor: menuBar = new JMenuBar(); menu = new JMenu("File"); menu.setMnemonic(KeyEvent.VK_F); menuBar.add(menu); JMenuItem openMenuItem = new JMenuItem("Open", KeyEvent.VK_O); // ADD FILE OPENING //openMenuItem.addActionListener(menuListener); menu.add(openMenuItem); JMenuItem saveMenuItem = new JMenuItem("Save", new ImageIcon("/images/save.gif")); saveMenuItem.setMnemonic(KeyEvent.VK_S); saveMenuItem.addActionListener( new SaveAction(false) ); menu.add(saveMenuItem); // menu.add(new SaveAction(false)); JMenuItem saveMenuItemAs = new JMenuItem("SaveAs", new ImageIcon("/images/saveas.gif")); //saveMenuItemAs.setMnemonic(KeyEvent.VK_S); saveMenuItemAs.addActionListener( new SaveAction(true) ); menu.add(saveMenuItemAs); //menu.add(new SaveAction(true)); JMenuItem closeMenuItem = new JMenuItem("Close", KeyEvent.VK_C); closeMenuItem.addActionListener( new ActionListener() { public void actionPerformed(ActionEvent e) { System.exit(0); } } ); menu.add(closeMenuItem);

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  • Different positions in ViewPager

    - by Kalai Selvan.G
    In my Application am using ViewPager to swipe the images,which comes through webservice as URL. Everything goes smoothly,the problem is while swiping myself getting the position as collapsed one.. Swipe left-right: positions are 1,2,3,4,5,etc.. if i stops swiping at 5th pos and started to Swipe from right-left: positions are 2,1...why this happens? I need to catch the position of the imageURL to find out the ID of the specific image and so i need to download and set it as wallpaper.. Normally while we swipe from right-left,the positions should decrease like 4,3,2,1. Also in debugger mode i got some start position,end position,last position with different values.. Any Clue about ViewPager. Here is my code: public class ImagePagerActivity extends BaseActivity { private ViewPager pager; private DisplayImageOptions options; public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.ac_image_pager); Bundle bundle = getIntent().getExtras(); String[] imageUrls = bundle.getStringArray(Extra.IMAGES); int pagerPosition = bundle.getInt(Extra.IMAGE_POSITION, 0); options = new DisplayImageOptions.Builder() .showImageForEmptyUrl(R.drawable.image_for_empty_url) .cacheOnDisc() .decodingType(DecodingType.MEMORY_SAVING) .build(); pager = (ViewPager) findViewById(R.id.pager); pager.setAdapter(new ImagePagerAdapter(imageUrls)); pager.setCurrentItem(pagerPosition); } private class ImagePagerAdapter extends PagerAdapter { private String[] images; private LayoutInflater inflater; ImagePagerAdapter(String[] images) { this.images = images; inflater = getLayoutInflater(); } @Override public void destroyItem(View container, int position, Object object) { ((ViewPager) container).removeView((View) object); } @Override public void finishUpdate(View container) { } @Override public int getCount() { return images.length; } @Override public Object instantiateItem(View view, int position) { final FrameLayout imageLayout = (FrameLayout) inflater.inflate(R.layout.item_pager_image, null); final ImageView imageView = (ImageView) imageLayout.findViewById(R.id.image); final ProgressBar spinner = (ProgressBar) imageLayout.findViewById(R.id.loading); imageLoader.displayImage(images[position], imageView, options, new ImageLoadingListener() { public void onLoadingStarted() { spinner.setVisibility(View.VISIBLE); } public void onLoadingFailed() { spinner.setVisibility(View.GONE); imageView.setImageResource(android.R.drawable.ic_delete); } public void onLoadingComplete() { spinner.setVisibility(View.GONE); } }); ((ViewPager) view).addView(imageLayout, 0); return imageLayout; } @Override public boolean isViewFromObject(View view, Object object) { return view.equals(object); } @Override public void restoreState(Parcelable state, ClassLoader loader) { } @Override public Parcelable saveState() { return null; } @Override public void startUpdate(View container) { } } }

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  • why PaintComponent event in Java happen everytime I use its Graphics Event?

    - by Pooya
    Consider this code: public class StateChartPanel extends JPanel { private LightContext LC; public StateChartPanel(LightContext lc){ LC=lc; } public void paintComponent( Graphics G ){ super.paintComponent( G ); LC.DrawStateChart((Graphics2D)G); } } StateChartPanel is a panel to draw something (a state chart). It sends its Graphics object to LC which use it to draw shapes but whenever it draws something the PaintComponent event of StateChartPanel happens again and it causes my application to hang.

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  • On Mac, two jpg's whose color should match do not

    - by Tim
    So I'm designing a myspace page and I have two images, one is a repeating bg image, and another is an image which loads on a layer above it, which acts as a header/masthead. For some reason, on Macs only, and only in the browser (tested in safari and ff), the masthead renders slightly darker than the repeating bg image, creating this color inconsistency. The block that extends up behind the album artwork is a solid box made with css which blocks some of myspace's standard content. It actually renders as the proper color, blending in well with the bottom portion of this image, which is the repeating part of the background, but becomes noticeable as it extends up, over the masthead, which is darker than it should be. Both images where created in GIMP and saved as jpg's using, as far as i can tell, the same settings. Here's the pic of what is going on: Screenshot - Click Me!!! Here is the code which controls this part of the design. <div class="masthead"><span></span></div> .masthead {width: 1600px; height: 1940px; background-image:url(http://www.sourtricks.com/myspace/bdww/myspace_bg09.jpg); position: absolute; margin-left: -800px; left: 50%; top: 0px; z-index: -1; overflow-x: hidden;} body.bodyContent{ margin: 0 !important; padding: 0 !important; background-color: 000000 !important; font-size: 1px; background-image: url(http://www.sourtricks.com/myspace/bdww/bg_repeat05.jpg); background-position: center bottom; _background-position: right bottom; background-attachment: scroll; background-repeat: repeat-y; z-index: -2; overflow-x: hidden; font-family: arial, sans-serif !important; } Any help would be much, much, much appreciated. Thanks for your time, Tim

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  • idiomatic property changed notification in scala?

    - by Jeremy Bell
    I'm trying to find a cleaner alternative (that is idiomatic to Scala) to the kind of thing you see with data-binding in WPF/silverlight data-binding - that is, implementing INotifyPropertyChanged. First, some background: In .Net WPF or silverlight applications, you have the concept of two-way data-binding (that is, binding the value of some element of the UI to a .net property of the DataContext in such a way that changes to the UI element affect the property, and vise versa. One way to enable this is to implement the INotifyPropertyChanged interface in your DataContext. Unfortunately, this introduces a lot of boilerplate code for any property you add to the "ModelView" type. Here is how it might look in Scala: trait IDrawable extends INotifyPropertyChanged { protected var drawOrder : Int = 0 def DrawOrder : Int = drawOrder def DrawOrder_=(value : Int) { if(drawOrder != value) { drawOrder = value OnPropertyChanged("DrawOrder") } } protected var visible : Boolean = true def Visible : Boolean = visible def Visible_=(value: Boolean) = { if(visible != value) { visible = value OnPropertyChanged("Visible") } } def Mutate() : Unit = { if(Visible) { DrawOrder += 1 // Should trigger the PropertyChanged "Event" of INotifyPropertyChanged trait } } } For the sake of space, let's assume the INotifyPropertyChanged type is a trait that manages a list of callbacks of type (AnyRef, String) = Unit, and that OnPropertyChanged is a method that invokes all those callbacks, passing "this" as the AnyRef, and the passed-in String). This would just be an event in C#. You can immediately see the problem: that's a ton of boilerplate code for just two properties. I've always wanted to write something like this instead: trait IDrawable { val Visible = new ObservableProperty[Boolean]('Visible, true) val DrawOrder = new ObservableProperty[Int]('DrawOrder, 0) def Mutate() : Unit = { if(Visible) { DrawOrder += 1 // Should trigger the PropertyChanged "Event" of ObservableProperty class } } } I know that I can easily write it like this, if ObservableProperty[T] has Value/Value_= methods (this is the method I'm using now): trait IDrawable { // on a side note, is there some way to get a Symbol representing the Visible field // on the following line, instead of hard-coding it in the ObservableProperty // constructor? val Visible = new ObservableProperty[Boolean]('Visible, true) val DrawOrder = new ObservableProperty[Int]('DrawOrder, 0) def Mutate() : Unit = { if(Visible.Value) { DrawOrder.Value += 1 } } } // given this implementation of ObservableProperty[T] in my library // note: IEvent, Event, and EventArgs are classes in my library for // handling lists of callbacks - they work similarly to events in C# class PropertyChangedEventArgs(val PropertyName: Symbol) extends EventArgs("") class ObservableProperty[T](val PropertyName: Symbol, private var value: T) { protected val propertyChanged = new Event[PropertyChangedEventArgs] def PropertyChanged: IEvent[PropertyChangedEventArgs] = propertyChanged def Value = value; def Value_=(value: T) { if(this.value != value) { this.value = value propertyChanged(this, new PropertyChangedEventArgs(PropertyName)) } } } But is there any way to implement the first version using implicits or some other feature/idiom of Scala to make ObservableProperty instances function as if they were regular "properties" in scala, without needing to call the Value methods? The only other thing I can think of is something like this, which is more verbose than either of the above two versions, but is still less verbose than the original: trait IDrawable { private val visible = new ObservableProperty[Boolean]('Visible, false) def Visible = visible.Value def Visible_=(value: Boolean): Unit = { visible.Value = value } private val drawOrder = new ObservableProperty[Int]('DrawOrder, 0) def DrawOrder = drawOrder.Value def DrawOrder_=(value: Int): Unit = { drawOrder.Value = value } def Mutate() : Unit = { if(Visible) { DrawOrder += 1 } } }

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  • Is my fragment usage correct, seems to be slow on adnroid

    - by Robertoq
    My app structure is that i have a menu with 5 menu-point om the left side, and the content on the right side. MainActivity.xml <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <fragment android:id="@+id/fragmentMenu" android:name="com.example.FragmentMenu" android:layout_width="@dimen/MenuWidth" android:layout_height="match_parent" /> <LinearLayout android:id="@+id/content" android:layout_width="match_parent" android:layout_height="match_parent" android_layout_toRightOf="@+id/fragmentMenu" android:orientation="vertical"/> </RelativeLayout> MainActivity.java public class FragmentActivityMain extends FragmentActivity { @Override protected void onCreate(final Bundle arg0) { super.onCreate(arg0); setContentView(R.layout.fragment_activity_main); FragmentManager fm = getSupportFragmentManager(); FragmentMenu fragmentMenu = (FragmentMenu) fm.findFragmentById(R.id.fragmentMenu); fragmentMenu.init(); } } And certainly I have a FragmenMenu class, public class FragmentMenu extends ListFragment { @Override public View onCreateView(final LayoutInflater inflater, final ViewGroup container, final Bundle savedInstanceState) { View view = inflater.inflate(R.layout.fragment_menu, container, false); return view; } public init() { FragmentManager fm = getFragmentManager(); FragmentTransaction ft = fm.beginTransaction(); FragmentNowListView lw = new FragmentCarListView(); ft.add(R.id.content, lw); ft.commit(); } } The FragmentCarList is a simple list, now with static test data, only five items in a List My Problem: Slow. I tested the app on my phone (Galaxy S3) and I see white screen when app starting, around 0,5 second and this is the log: 10-29 11:43:44.093: D/dalvikvm(29710): GC_CONCURRENT freed 267K, 5% free 13903K/14535K, paused 10ms+2ms 10-29 11:43:44.133: D/dalvikvm(29710): GC_FOR_ALLOC freed 215K, 6% free 13896K/14663K, paused 12ms 10-29 11:43:44.233: D/dalvikvm(29710): GC_FOR_ALLOC freed 262K, 6% free 13901K/14663K, paused 12ms 10-29 11:43:44.258: D/dalvikvm(29710): GC_FOR_ALLOC freed 212K, 6% free 13897K/14663K, paused 13ms 10-29 11:43:44.278: D/dalvikvm(29710): GC_FOR_ALLOC freed 208K, 6% free 13897K/14663K, paused 12ms 10-29 11:43:44.328: D/dalvikvm(29710): GC_FOR_ALLOC freed 131K, 4% free 14098K/14663K, paused 12ms 10-29 11:43:44.398: D/dalvikvm(29710): GC_CONCURRENT freed 20K, 3% free 14559K/14919K, paused 1ms+4ms And when I tested on Xperia Ray, the whit screen appear longer time. How can I optimize my fragments? Thx

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  • Strange results - I obtain same value for all keys

    - by Pietro Luciani
    I have a problem with mapreduce. Giving as input a list of song ("Songname"#"UserID"#"boolean") i must have as result a song list in which is specified how many time different useres listen them... so a output ("Songname","timelistening"). I used hashtable to allow only one couple . With short files it works well but when I put as input a list about 1000000 of records it returns me the same value (20) for all records. This is my mapper: public static class CanzoniMapper extends Mapper<Object, Text, Text, IntWritable>{ private IntWritable userID = new IntWritable(0); private Text song = new Text(); public void map(Object key, Text value, Context context) throws IOException, InterruptedException { /*StringTokenizer itr = new StringTokenizer(value.toString()); while (itr.hasMoreTokens()) { word.set(itr.nextToken()); context.write(word, one); }*/ String[] caratteri = value.toString().split("#"); if(caratteri[2].equals("1")){ song.set(caratteri[0]); userID.set(Integer.parseInt(caratteri[1])); context.write(song,userID); } } } This is my reducer: public static class CanzoniReducer extends Reducer<Text,IntWritable,Text,IntWritable> { private IntWritable result = new IntWritable(); public void reduce(Text key, Iterable<IntWritable> values, Context context) throws IOException, InterruptedException { Hashtable<IntWritable,Text> doppioni = new Hashtable<IntWritable,Text>(); for (IntWritable val : values) { doppioni.put(val,key); } result.set(doppioni.size()); //doppioni.clear(); context.write(key,result); } } and main: Configuration conf = new Configuration(); Job job = new Job(conf, "word count"); job.setJarByClass(Canzoni.class); job.setMapperClass(CanzoniMapper.class); //job.setCombinerClass(CanzoniReducer.class); //job.setNumReduceTasks(2); job.setReducerClass(CanzoniReducer.class); job.setOutputKeyClass(Text.class); job.setOutputValueClass(IntWritable.class); FileInputFormat.addInputPath(job, new Path(args[0])); FileOutputFormat.setOutputPath(job, new Path(args[1])); System.exit(job.waitForCompletion(true) ? 0 : 1); Any idea???

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  • Codeigniter how to access class variables

    - by Obay
    I thought this was going to be a no-brainer but I can't seem to access member variables: class MyObject extends Controller { private $START_OF_WEEK = 1; /* constructor here */ function index() { echo $this->$START_OF_WEEK; } } echo $this->$START_OF_WEEK; says Cannot access empty property How do I access member variables? Or... how do I declare them correctly?

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  • Hibernate @DiscriminatorColumn and @DiscriminatorValue issue

    - by user224270
    I have this parent class: @Entity @Inheritance(strategy = InheritanceType.JOINED) @Table(name = "BSEntity") @DiscriminatorColumn(name = "resourceType", discriminatorType = DiscriminatorType.STRING, length = 32) public abstract class BaseEntity { and the subclass @Entity @Table(name = "BSCategory") @DiscriminatorValue("Category") public class CategoryEntity extends BaseEntity { But when I run the program, I get the following error: 2010-06-03 10:13:54,222 [main] WARN (org.hibernate.util.JDBCExceptionReporter:100) - SQL Error: 1364, SQLState: HY000 2010-06-03 10:13:54,222 [main] ERROR (org.hibernate.util.JDBCExceptionReporter:101) - Field 'resourceType' doesn't have a default value Any thoughts? Updated: Database is MySQL. I have also changed inheritance strategy to JOINED instead of SINGLE_TABLE. Help

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  • Usage of @specialized in traits

    - by paradigmatic
    I have a trait and an implementation looking like: trait Foo[A] { def bar[B >: A: Ordering]: Foo[B] } class FooImpl[A]( val a: A, val values: List[Foo[A]] ) extends Foo[A] { def bar[B >: A] = { /* concrete implementation */} } I would like to use the @specialized annotation on A and B to avoid autoboxing. Do I need to use it in both trait and implementation, only in implementation, or only in trait ?

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  • Unpacking tuple types in Scala

    - by jpalecek
    I was just wondering, can I decompose a tuple type into its components' types in Scala? I mean, something like this trait Container { type Element } trait AssociativeContainer extends Container { type Element <: (Unit, Unit) def get(x : Element#First) : Element#Second }

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  • CodeIgniter helper inside controllers

    - by kapitanluffy
    can i call helper functions inside controller classes? let's say i have this controller with the _open_form method class User extends Controller { function _open_form($action){ print_r(form_open($action)); } } i tried echoing out the result of form_open() but it returns null. it seems that helper functions can't be called inside controllers if your wondering why i need to use it inside the controller instead in the view because we are required to use the given template parser xD

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  • multiple class inheritance

    - by redcoder
    In PHP, is it possible to have multiple inheritance (by the nature of the PHP, not writting modification code) ? example : class a { public function foo(); } class b { public function bar(); } class c extends a, b { public function baz(); }

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