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• Silverlight 4 + RIA Services: Ready for Business: Updating Data in the Client

  To continue our series, lets look at updating the data.  I have created a Plates.xaml page with very similar structure to the above.    For details on how I created this page, check out my PDC 09 demo walk through.    Now lets look at updating the Plate data.. First we will create some default form UI by dragging an entity from the datasources window in much the same way we did above.  But before we create the UI, notice the order of the fields it...Did you know that DotNetSlackers also publishes .net articles written by top known .net Authors? We already have over 80 articles in several categories including Silverlight. Take a look: here.

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• MVP: Updating View’s binding asynchronously with the SynchronizationContext object

  MVP: Updating View’s binding asynchronously with the SynchronizationContext object.

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• Implementing touch-based rotation in cocoa touch

  - by ewoo

  I am wondering what is the best way to implement rotation-based dragging movements in my iPhone application. I have a UIView that I wish to rotate around its centre, when the users finger is touch the view and they move it. Think of it like a dial that needs to be adjusted with the finger. The basic question comes down to: 1) Should I remember the initial angle and transform when touchesBegan is called, and then every time touchesMoved is called apply a new transform to the view based on the current position of the finger, e.g., something like: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self]; //current position of touch if (([touch view] == self) && [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS //middle is centre of view && [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //will be rotation gesture //remember state of view at beginning of touch CGPoint top = CGPointMake(self.middle.x, 0); self.initialTouch = currentPoint; self.initialAngle = angleBetweenLines(self.middle, top, self.middle, currentPoint); self.initialTransform = self.transform; } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self]; //current position of touch if (([touch view] == self) && [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS && [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //a rotation gesture //rotate tile float newAngle = angleBetweenLines(self.middle, CGPointMake(self.middle.x, 0), self.middle, currentPoint); //touch angle float angleDif = newAngle - self.initialAngle; //work out dif between angle at beginning of touch and now. CGAffineTransform newTransform = CGAffineTransformRotate(self.initialTransform, angleDif); //create new transform self.transform = newTransform; //apply transform. } OR 2) Should I simply remember the last known position/angle, and rotate the view based on the difference in angle between that and now, e.g.,: - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self]; //current position of touch if (([touch view] == self) && [Utility getDistance:currentPoint toPoint:self.middle] <= ROTATE_RADIUS && [Utility getDistance:currentPoint toPoint:self.middle] >= MOVE_RADIUS) { //will be rotation gesture //remember state of view at beginning of touch CGPoint top = CGPointMake(self.middle.x, 0); self.lastTouch = currentPoint; self.lastAngle = angleBetweenLines(self.middle, top, self.middle, currentPoint); } } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{ UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self]; //current position of touch if (([touch view] == self) && [Utility getDistance:currentPoint toPoint:middle] <= ROTATE_RADIUS && [Utility getDistance:currentPoint toPoint:middle] >= MOVE_RADIUS) { //a rotation gesture //rotate tile float newAngle = angleBetweenLines(self.middle, CGPointMake(self.middle.x, 0), self.middle, currentPoint); //touch angle float angleDif = newAngle - self.lastAngle; //work out dif between angle at beginning of touch and now. CGAffineTransform newTransform = CGAffineTransformRotate(self.transform, angleDif); //create new transform self.transform = newTransform; //apply transform. self.lastTouch = currentPoint; self.lastAngle = newAngle; } The second option makes more sense to me, but it is not giving very pleasing results (jaggy updates and non-smooth rotations). Which way is best (if any), in terms of performance? Cheers!

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• I am looking for information to make my windows form app self updating.

  - by JPJedi

  I would like to make my windows form app self updating when it starts. Where can I find good information for that? I am using Visual Studio 2008 VB.NET.

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• i have two mpmovieplayercontrollers and two separate subviews that they utilze... except that only o

  - by theprojectabot

  I would like to have both movies playing at once in their two separate sub views. They are both accessing different media. this is on an ipad with a superview and two little views 320x240 right by eachother on the xib. -(IBAction)playLeft:(id)sender{ if ([self.playerRight playbackState] == MPMoviePlaybackStatePlaying); [self.playerRight stop]; [self.playerLeft play]; } -(IBAction)playRight:(id)sender{ if ([self.playerLeft playbackState] == MPMoviePlaybackStatePlaying); [self.playerLeft stop]; [self.playerRight play]; } - (void)viewDidLoad { [super viewDidLoad]; self.view.backgroundColor = [UIColor viewFlipsideBackgroundColor]; self.playerLeft = [[MPMoviePlayerController alloc] init]; self.playerLeft.contentURL = [self movieURL]; NSLog(@"self.playerLeft %@", self.playerLeft); self.playerRight = [[MPMoviePlayerController alloc] init]; self.playerRight.contentURL = [self movieURL2]; NSLog(@"self.playerRight %@", self.playerRight); // START_HIGHLIGHT self.playerLeft.view.frame = self.leftView.bounds; self.playerLeft.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; self.playerRight.view.frame = self.rightView.bounds; self.playerRight.view.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight; [self.rightView addSubview:playerRight.view]; [self.leftView addSubview:playerLeft.view]; //[self.playerRight play]; //[self.playerLeft play]; //[self clickedOpenMovie:nil]; } -(NSURL *)movieURL { NSBundle *bundle = [NSBundle mainBundle]; NSString *moviePath = [bundle pathForResource:@"720p5994-prores-hq_iPhone_320x240 two" ofType:@"m4v"]; //NSString *moviePath = [NSString stringWithFormat:@"http://localhost:1935/live/aStream/playlist.m3u8"]; if (moviePath) { return [NSURL fileURLWithPath:moviePath]; //return [NSURL URLWithString:moviePath]; } else { return nil; } } -(NSURL *)movieURL2 { NSBundle *bundle = [NSBundle mainBundle]; NSString *moviePath = [bundle pathForResource:@"720p5994-prores-hq_iPhone_320x240" ofType:@"m4v"]; if (moviePath) { return [NSURL fileURLWithPath:moviePath]; } else { return nil; } }

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• Qt/PyQt dialog with toggable fullscreen mode - problem on Windows

  - by Guard

  I have a dialog created in PyQt. It's purpose and functionality don't matter. The init is: class MyDialog(QWidget, ui_module.Ui_Dialog): def __init__(self, parent=None): super(MyDialog, self).__init__(parent) self.setupUi(self) self.installEventFilter(self) self.setWindowFlags(Qt.Dialog | Qt.WindowTitleHint) self.showMaximized() Then I have event filtering method: def eventFilter(self, obj, event): if event.type() == QEvent.KeyPress: key = event.key() if key == Qt.Key_F11: if self.isFullScreen(): self.setWindowFlags(self._flags) if self._state == 'm': self.showMaximized() else: self.showNormal() self.setGeometry(self._geometry) else: self._state = 'm' if self.isMaximized() else 'n' self._flags = self.windowFlags() self._geometry = self.geometry() self.setWindowFlags(Qt.Tool | Qt.FramelessWindowHint) self.showFullScreen() return True elif key == Qt.Key_Escape: self.close() return QWidget.eventFilter(self, obj, event) As can be seen, Esc is used for dialog hiding, and F11 is used for toggling full-screen. In addition, if the user changed the dialog mode from the initial maximized to normal and possibly moved the dialog, it's state and position are restored after exiting the full-screen. Finally, the dialog is created on the MainWindow action triggered: d = MyDialog(self) d.show() It works fine on Linux (Ubuntu Lucid), but quite strange on Windows 7: if I go to the full-screen from the maximized mode, I can't exit full-screen (on F11 dialog disappears and appears in full-screen mode again. If I change the dialog's mode to Normal (by double-clicking its title), then go to full-screen and then return back, the dialog is shown in the normal mode, in the correct position, but without the title line. Most probably the reason for both cases is the same - the setWindowFlags doesn't work. But why? Is it also possible that it is the bug in the recent PyQt version? On Ubuntu I have 4.6.x from apt, and on Windows - the latest installer from the riverbank site.

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• Qt/PyQt dialog with togglable fullscreen mode - problem on Windows

  - by Guard

  I have a dialog created in PyQt. It's purpose and functionality don't matter. The init is: class MyDialog(QWidget, ui_module.Ui_Dialog): def __init__(self, parent=None): super(MyDialog, self).__init__(parent) self.setupUi(self) self.installEventFilter(self) self.setWindowFlags(Qt.Dialog | Qt.WindowTitleHint) self.showMaximized() Then I have event filtering method: def eventFilter(self, obj, event): if event.type() == QEvent.KeyPress: key = event.key() if key == Qt.Key_F11: if self.isFullScreen(): self.setWindowFlags(self._flags) if self._state == 'm': self.showMaximized() else: self.showNormal() self.setGeometry(self._geometry) else: self._state = 'm' if self.isMaximized() else 'n' self._flags = self.windowFlags() self._geometry = self.geometry() self.setWindowFlags(Qt.Tool | Qt.FramelessWindowHint) self.showFullScreen() return True elif key == Qt.Key_Escape: self.close() return QWidget.eventFilter(self, obj, event) As can be seen, Esc is used for dialog hiding, and F11 is used for toggling full-screen. In addition, if the user changed the dialog mode from the initial maximized to normal and possibly moved the dialog, it's state and position are restored after exiting the full-screen. Finally, the dialog is created on the MainWindow action triggered: d = MyDialog(self) d.show() It works fine on Linux (Ubuntu Lucid), but quite strange on Windows 7: if I go to the full-screen from the maximized mode, I can't exit full-screen (on F11 dialog disappears and appears in full-screen mode again). If I change the dialog's mode to Normal (by double-clicking its title), then go to full-screen and then return back, the dialog is shown in the normal mode, in the correct position, but without the title line. Most probably the reason for both cases is the same - the setWindowFlags doesn't work. But why? Is it also possible that it is the bug in the recent PyQt version? On Ubuntu I have 4.6.x from apt, and on Windows - the latest installer from the riverbank site.

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• qwebview in pyside after packaged with pyinstaller goes wrong

  - by truease.com

  Here's my code import sys from PySide.QtCore import * from PySide.QtGui import * from PySide.QtWebKit import * from encodings import * from codecs import * class BrowserWindow( QWidget ): def __init__( self, parent=None ): QWidget.__init__( self, parent ) self.Setup() self.SetupEvent() def Setup( self ): self.setWindowTitle( u"Truease Speedy Browser" ) self.addr_input = QLineEdit() self.addr_go = QPushButton( "GO" ) self.addr_bar = QHBoxLayout() self.addr_bar.addWidget( self.addr_input ) self.addr_bar.addWidget( self.addr_go ) for attr in [ QWebSettings.AutoLoadImages, QWebSettings.JavascriptEnabled, QWebSettings.JavaEnabled, QWebSettings.PluginsEnabled, QWebSettings.JavascriptCanOpenWindows, QWebSettings.JavascriptCanAccessClipboard, QWebSettings.DeveloperExtrasEnabled, QWebSettings.SpatialNavigationEnabled, QWebSettings.OfflineStorageDatabaseEnabled, QWebSettings.OfflineWebApplicationCacheEnabled, QWebSettings.LocalStorageEnabled, QWebSettings.LocalStorageDatabaseEnabled, QWebSettings.LocalContentCanAccessRemoteUrls, QWebSettings.LocalContentCanAccessFileUrls, ]: QWebSettings.globalSettings().setAttribute( attr, True ) self.web_view = QWebView() self.web_view.load( "http://www.baidu.com" ) layout = QVBoxLayout() layout.addLayout( self.addr_bar ) layout.addWidget( self.web_view ) self.setLayout( layout ) def SetupEvent( self ): self.connect( self.addr_input, SIGNAL("editingFinished()"), self, SLOT("Load()"), ) self.connect( self.addr_go, SIGNAL("pressed()"), self, SLOT("Load()") ) self.connect( self.web_view, SIGNAL("urlChanged(const QUrl&)"), self, SLOT("SetURL()"), ) def Load( self, *args, **kwargs ): url = self.GetCleanedURL() if url != self.CurrentURL(): self.web_view.load( url ) def SetURL( self, *args, **kwargs ): self.addr_input.setText( self.CurrentURL() ) def GetCleanedURL( self ): url = self.addr_input.text().strip() if not url.startswith("http"): url = "http://" + url return url def CurrentURL( self ): url = self.web_view.url().toString() return url def Main(): app = QApplication( sys.argv ) widget = BrowserWindow() widget.show() return app.exec_() if __name__ == '__main__': sys.exit( Main() ) I works well when i using python browser.py. but it goes wrong after packaged with pyinstaller -w browser.py. it doesn't load images can only display correct text in utf-8 And this is the pyinstaller output: E:\true\wuk\app2>pyinstaller -w b.py 16 INFO: wrote E:\true\wuk\app2\b.spec 16 INFO: Testing for ability to set icons, version resources... 32 INFO: ... resource update available 32 INFO: UPX is not available. 46 INFO: Processing hook hook-os 141 INFO: Processing hook hook-time 157 INFO: Processing hook hook-cPickle 218 INFO: Processing hook hook-_sre 312 INFO: Processing hook hook-cStringIO 407 INFO: Processing hook hook-encodings 421 INFO: Processing hook hook-codecs 750 INFO: Processing hook hook-httplib 750 INFO: Processing hook hook-email 843 INFO: Processing hook hook-email.message 1046 WARNING: library python%s%s required via ctypes not found 1171 INFO: Extending PYTHONPATH with E:\true\wuk\app2 1171 INFO: checking Analysis 1171 INFO: building because b.py changed 1171 INFO: running Analysis out00-Analysis.toc 1171 INFO: Adding Microsoft.VC90.CRT to dependent assemblies of final executable 1171 INFO: Searching for assembly x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww ... 1171 INFO: Found manifest C:\WINDOWS\WinSxS\Manifests\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375.manifest 1187 INFO: Searching for file msvcr90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcr90.dll 1187 INFO: Searching for file msvcp90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcp90.dll 1187 INFO: Searching for file msvcm90.dll 1187 INFO: Found file C:\WINDOWS\WinSxS\x86_Microsoft.VC90.CRT_1fc8b3b9a1e18e3b_9.0.21022.8_x-ww_d08d0375\msvcm90.dll 1266 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\_pyi_bootstrap.py 1266 INFO: Processing hook hook-os 1282 INFO: Processing hook hook-site 1296 INFO: Processing hook hook-encodings 1391 INFO: Processing hook hook-time 1407 INFO: Processing hook hook-cPickle 1468 INFO: Processing hook hook-_sre 1578 INFO: Processing hook hook-cStringIO 1671 INFO: Processing hook hook-codecs 2016 INFO: Processing hook hook-httplib 2016 INFO: Processing hook hook-email 2109 INFO: Processing hook hook-email.message 2312 WARNING: library python%s%s required via ctypes not found 2468 INFO: Processing hook hook-pydoc 2516 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_importers.py 2609 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_archive.py 2687 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_carchive.py 2782 INFO: Analyzing D:\Applications\Python\lib\site-packages\pyinstaller-2.1-py2.7.egg\PyInstaller\loader\pyi_os_path.py 2782 INFO: Analyzing b.py 2796 INFO: Processing hook hook-PySide 2875 INFO: Hidden import 'codecs' has been found otherwise 2875 INFO: Hidden import 'encodings' has been found otherwise 2875 INFO: Looking for run-time hooks 7766 INFO: Using Python library C:\WINDOWS\system32\python27.dll 7796 INFO: E:\true\wuk\app2\build\b\out00-Analysis.toc no change! 7796 INFO: checking PYZ 7812 INFO: checking PKG 7812 INFO: building because E:\true\wuk\app2\build\b\b.exe.manifest changed 7812 INFO: building PKG (CArchive) out00-PKG.pkg 7828 INFO: checking EXE 7843 INFO: rebuilding out00-EXE.toc because pkg is more recent 7843 INFO: building EXE from out00-EXE.toc 7843 INFO: Appending archive to EXE E:\true\wuk\app2\build\b\b.exe 7843 INFO: checking COLLECT 7843 INFO: building COLLECT out00-COLLECT.toc Use pyinstaller browser.py, and in the console window i got QFont::setPixelSize: Pixel size <= 0 (0) QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QSslSocket: cannot call unresolved function SSLv23_client_method QSslSocket: cannot call unresolved function SSL_CTX_new QSslSocket: cannot call unresolved function SSL_library_init QSslSocket: cannot call unresolved function ERR_get_error QFont::setPixelSize: Pixel size <= 0 (0)

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• Add UIView and UILabel to UICollectionViewCell. Then Segue based on clicked cell index

  - by JetSet

  I am new to collection views in Objective-C. Can anyone tell me why I can't see my UILabel embedded in the transparent UIView and the best way to resolve. I want to also segue from the cell to several various UIViewControllers based on the selected index cell. I am using GitHub project https://github.com/mayuur/MJParallaxCollectionView Overall, in MJRootViewController.m I wanted to add a UIView with a transparency and a UILabel with details of the cell from a array. MJCollectionViewCell.h // MJCollectionViewCell.h // RCCPeakableImageSample // // Created by Mayur on 4/1/14. // Copyright (c) 2014 RCCBox. All rights reserved. // #import <UIKit/UIKit.h> #define IMAGE_HEIGHT 200 #define IMAGE_OFFSET_SPEED 25 @interface MJCollectionViewCell : UICollectionViewCell /* image used in the cell which will be having the parallax effect */ @property (nonatomic, strong, readwrite) UIImage *image; /* Image will always animate according to the imageOffset provided. Higher the value means higher offset for the image */ @property (nonatomic, assign, readwrite) CGPoint imageOffset; //@property (nonatomic,readwrite) UILabel *textLabel; @property (weak, nonatomic) IBOutlet UILabel *textLabel; @property (nonatomic,readwrite) NSString *text; @property(nonatomic,readwrite) CGFloat x,y,width,height; @property (nonatomic,readwrite) NSInteger lineSpacing; @property (nonatomic, strong) IBOutlet UIView* overlayView; @end MJCollectionViewCell.m // // MJCollectionViewCell.m // RCCPeakableImageSample // // Created by Mayur on 4/1/14. // Copyright (c) 2014 RCCBox. All rights reserved. // #import "MJCollectionViewCell.h" @interface MJCollectionViewCell() @property (nonatomic, strong, readwrite) UIImageView *MJImageView; @end @implementation MJCollectionViewCell - (instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) [self setupImageView]; return self; } - (id)initWithCoder:(NSCoder *)aDecoder { self = [super initWithCoder:aDecoder]; if (self) [self setupImageView]; return self; } /* // Only override drawRect: if you perform custom drawing. // An empty implementation adversely affects performance during animation. - (void)drawRect:(CGRect)rect { // Drawing code } */ #pragma mark - Setup Method - (void)setupImageView { // Clip subviews self.clipsToBounds = YES; // Add image subview self.MJImageView = [[UIImageView alloc] initWithFrame:CGRectMake(self.bounds.origin.x, self.bounds.origin.y, self.bounds.size.width, IMAGE_HEIGHT)]; self.MJImageView.backgroundColor = [UIColor redColor]; self.MJImageView.contentMode = UIViewContentModeScaleAspectFill; self.MJImageView.clipsToBounds = NO; [self addSubview:self.MJImageView]; } # pragma mark - Setters - (void)setImage:(UIImage *)image { // Store image self.MJImageView.image = image; // Update padding [self setImageOffset:self.imageOffset]; } - (void)setImageOffset:(CGPoint)imageOffset { // Store padding value _imageOffset = imageOffset; // Grow image view CGRect frame = self.MJImageView.bounds; CGRect offsetFrame = CGRectOffset(frame, _imageOffset.x, _imageOffset.y); self.MJImageView.frame = offsetFrame; } - (void)setText:(NSString *)text{ _text=text; if (!self.textLabel) { CGFloat realH=self.height*2/3-self.lineSpacing; CGFloat latoA=realH/3; // self.textLabel=[[UILabel alloc] initWithFrame:CGRectMake(10,latoA/2, self.width-20, realH)]; self.textLabel.layer.anchorPoint=CGPointMake(.5, .5); self.textLabel.font=[UIFont fontWithName:@"HelveticaNeue-ultralight" size:38]; self.textLabel.numberOfLines=3; self.textLabel.textColor=[UIColor whiteColor]; self.textLabel.shadowColor=[UIColor blackColor]; self.textLabel.shadowOffset=CGSizeMake(1, 1); self.textLabel.transform=CGAffineTransformMakeRotation(-(asin(latoA/(sqrt(self.width*self.width+latoA*latoA))))); [self addSubview:self.textLabel]; } self.textLabel.text=text; } @end MJViewController.h // // MJViewController.h // ParallaxImages // // Created by Mayur on 4/1/14. // Copyright (c) 2014 sky. All rights reserved. // #import <UIKit/UIKit.h> @interface MJRootViewController : UIViewController{ NSInteger choosed; } @end MJViewController.m // // MJViewController.m // ParallaxImages // // Created by Mayur on 4/1/14. // Copyright (c) 2014 sky. All rights reserved. // #import "MJRootViewController.h" #import "MJCollectionViewCell.h" @interface MJRootViewController () <UICollectionViewDataSource, UICollectionViewDelegate, UIScrollViewDelegate> @property (weak, nonatomic) IBOutlet UICollectionView *parallaxCollectionView; @property (nonatomic, strong) NSMutableArray* images; @end @implementation MJRootViewController - (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. //self.navigationController.navigationBarHidden=YES; // Fill image array with images NSUInteger index; for (index = 0; index < 14; ++index) { // Setup image name NSString *name = [NSString stringWithFormat:@"image%03ld.jpg", (unsigned long)index]; if(!self.images) self.images = [NSMutableArray arrayWithCapacity:0]; [self.images addObject:name]; } [self.parallaxCollectionView reloadData]; } - (void)didReceiveMemoryWarning { [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated. } #pragma mark - UICollectionViewDatasource Methods - (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return self.images.count; } - (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { MJCollectionViewCell* cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"MJCell" forIndexPath:indexPath]; //get image name and assign NSString* imageName = [self.images objectAtIndex:indexPath.item]; cell.image = [UIImage imageNamed:imageName]; //set offset accordingly CGFloat yOffset = ((self.parallaxCollectionView.contentOffset.y - cell.frame.origin.y) / IMAGE_HEIGHT) * IMAGE_OFFSET_SPEED; cell.imageOffset = CGPointMake(0.0f, yOffset); NSString *text; NSInteger index=choosed>=0 ? choosed : indexPath.row%5; switch (index) { case 0: text=@"I am the home cell..."; break; case 1: text=@"I am next..."; break; case 2: text=@"Cell 3..."; break; case 3: text=@"Cell 4..."; break; case 4: text=@"The last cell"; break; default: break; } cell.text=text; cell.overlayView.backgroundColor = [UIColor colorWithWhite:0.0f alpha:0.4f]; //cell.textLabel.text = @"Label showing"; cell.textLabel.font = [UIFont boldSystemFontOfSize:22.0f]; cell.textLabel.textColor = [UIColor whiteColor]; //This is another attempt to display the label by using tags. //UILabel* label = (UILabel*)[cell viewWithTag:1]; //label.text = @"Label works"; return cell; } #pragma mark - UIScrollViewdelegate methods - (void)scrollViewDidScroll:(UIScrollView *)scrollView { for(MJCollectionViewCell *view in self.parallaxCollectionView.visibleCells) { CGFloat yOffset = ((self.parallaxCollectionView.contentOffset.y - view.frame.origin.y) / IMAGE_HEIGHT) * IMAGE_OFFSET_SPEED; view.imageOffset = CGPointMake(0.0f, yOffset); } } @end

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• Rails: updating an association

  - by Sam

  I have a Reservation model which belongs_to a Sharedorder and so a Sharedorder has_many reservations. Give you a little background. I sharedorder has many reservations and each reservation can have an amount. A sharedorder has three status: 1) reserved, 2) confirmed, 3) and purchased. Here is my problem. When a reservation gets added to a sharedorder or an existing reservation's amount is updated I need this to affect the associated sharedoder because the status listed latter should only change when 100% of the reservations have been placed and so on. Here are the things I have tried: . class Reservation < ActiveRecord::Base before_save :sharedorder_reserved_status def sharedorder_reserved_status if self.sharedorder.reserved_percent(reservations_to_be_added) >= 100 && !self.sharedorder.reserved self.sharedorder.update_attribute(:reserved, true) self.sharedorder.update_attribute(:reserved_at, Time.now) end end def reservations_to_be_added if self.new_record? self.amount elsif self.amount_changed? self.amount - self.amount_was else 0 end end end And then in the Sharedorder model: class Sharedorder < ActiveRecord::Base def reserved_percent(amount_change) (((reserved_sum + amount_change).to_f / self.product.twenty_hq_size.to_f)*100).to_i end def reserved_sum if !@reserved_sum reserved_sum = 0 reserved_reservations.collect {|x| reserved_sum += x.amount } reserved_sum else @reserved_sum end end def reserved_reservations @reserved_reservations ||= Reservation.find(:all, :conditions => ['canceled = ? AND sharedorder_id = ?', false, self.id ]) end end I have also tried :touch => true on the reservation model to update the sharedorder put for some reason it doesn't seem to include the latest reservation being added or being updated. So what I'm trying to do is update the status of the sharedorder if a certain percent is reached and I have to send the additional amounts the the sharedorder for it to know to include additional reservations or updates on existing ones. How should I do this?

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• Updating physics for animated models

  - by Mathias Hölzl

  For a new game we have do set up a scene with a minimum of 30 bone animated models.(shooter) The problem is that the update process for the animated models takes too long. Thats what I do: Each character has ~30 bones and for every update tick the animation gets calculated and every bone fires a event with the new matrix. The physics receives the event with the new matrix and updates the collision shape for that bone. The time that it takes to build the animation isn't that bad (0.2ms for 30 Bones - 6ms for 30 models). But the main problem is that the physic engine (Bullet) uses a diffrent matrix for transformation and so its necessary to convert it. Code for matrix conversion: (~0.005ms) btTransform CLEAR_PHYSICS_API Mat_to_btTransform( Mat mat ) { btMatrix3x3 bulletRotation; btVector3 bulletPosition; XMFLOAT4X4 matData = mat.GetStorage(); // copy rotation matrix for ( int row=0; row<3; ++row ) for ( int column=0; column<3; ++column ) bulletRotation[row][column] = matData.m[column][row]; for ( int column=0; column<3; ++column ) bulletPosition[column] = matData.m[3][column]; return btTransform( bulletRotation, bulletPosition ); } The function for updating the transform(Physic): void CLEAR_PHYSICS_API BulletPhysics::VKinematicMove(Mat mat, ActorId aid) { if ( btRigidBody * const body = FindActorBody( aid ) ) { btTransform tmp = Mat_to_btTransform( mat ); body->setWorldTransform( tmp ); } } The real problem is the function FindActorBody(id): ActorIDToBulletActorMap::const_iterator found = m_actorBodies.find( id ); if ( found != m_actorBodies.end() ) return found->second; All physic actors are stored in m_actorBodies and thats why the updating process takes to long. But I have no idea how I could avoid this. Friendly greedings, Mathias

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• Updating an interface to bootstrap

  - by Anagio

  I'm updating a web apps interface to bootstrap. There's a lot of existing CSS and Javascript/jQuery i'll have to migrate, most i'll scrap and use bootstraps. But for parts of the app that use datatables and such all that code has to be migrated. I'm working on a development server. The app has a header.phtml sidebar.phtml and a lot of content area view files. Right now i'm building static versions of view files say the header. I then open my existing header.phtml into notepad++ split screen with the static file and copy over the dynamic code. Then replace the old header.phtml with the one I just made. To make sure the header displayed correctly I had to add all the CSS and JS from bootstrap. This is conflicting with the current CSS styles and some JS conflicts as well. Should I go through the app note what JS I absolutely need what I don't and same with the CSS. Then strip all the CSS/JS from the old app that is not needed so it only has bootstraps and any other critical files and not worry about the way pages look as i'm making progress to updating them. I'd be working on mostly a wireframe of the old site without any styles until I get to applying bootstraps. Is this efficient or is there another way I can get through all these files and update them easily?

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• Graphics hardware warning when updating to 14.04

  - by pacomet

  As I use Ubuntu at work I just update only LTS versions but now I'm not sure if I can/should. As my computer is now ten years old I would change if was mine but as it is owned by my employer I have to work with it. It's not a bad one, it runs fine (this was not true when still had Windows on it ;-). When updating to 14.04, it warns about possible bad/slow performance with Unity 3D so I stop updating as I am at work, not my own computer. As I understand from http://askubuntu.com/a/438958/25305 Nvidia Geforce FX 5500 graphics card is still supported in 14.04. Now, in 12.04, I have driver version 173 and unity 2d runs fine for me. output of /usr/lib/nux/unity_support_test -p OpenGL vendor string: NVIDIA Corporation OpenGL renderer string: GeForce FX 5500/AGP/SSE2 OpenGL version string: 2.1.2 NVIDIA 173.14.39 Not software rendered: yes Not blacklisted: no GLX fbconfig: yes GLX texture from pixmap: yes GL npot or rect textures: yes GL vertex program: yes GL fragment program: yes GL vertex buffer object: yes GL framebuffer object: yes GL version is 1.4+: yes Unity 3D supported: no Should I update? Is it better to stay with 12.04? Thanks

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• Is Game Programming very different from normal programming?

  - by Slateboard

  By normal programming, I'm referring to application programming (which is all I'm familiar with at the moment). My goal is to make games, and I wanted to know if the path was different than other programming paths at the beginner level. Or perhaps it's too early for me to worry about that at this stage?

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• close window in Tkinter message box

  - by rejinacm

  Hello, link text How to handle the "End Now" error in the below code: import Tkinter from Tkconstants import * import tkMessageBox tk = Tkinter.Tk() class MyApp: def __init__(self,parent): self.myparent = parent self.frame = Tkinter.Frame(tk,relief=RIDGE,borderwidth=2) self.frame.pack() self.message = Tkinter.Message(tk,text="Symbol Disolay") label=Tkinter.Label(self.frame,text="Is Symbol Displayed") label.pack() self.button1=Tkinter.Button(self.frame,text="YES") self.button1.pack(side=BOTTOM) self.button1.bind("<Button-1>", self.button1Click) self.button2=Tkinter.Button(self.frame,text="NO") self.button2.pack() self.button2.bind("<Button-1>", self.button2Click) self.myparent.protocol("WM_DELETE_WINDOW", self.handler) def button1Click(self, event): print "pressed yes" def button2Click(self, event): print "pressed no" def handler(self): if tkMessageBox.askokcancel("Quit?", "Are you sure you want to quit?"): self.myparent.quit() myapp = MyApp(tk) tk.mainloop()

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• Crossfading audio with PyQT4 and Phonon

  - by dwelch

  I'm trying to get audio files to crossfade with phonon. I'm using PyQT4. I have tracks queuing properly, but I'm stuck with the fade effect. I think I need to be using the KVolumeFader effect. Here's my current code: def music_play(self): self.delayedInit() self.m_media.setCurrentSource(Phonon.MediaSource(self.playlist[self.playlist_pos])) self.m_media.play() def music_stop(self): self.m_media.stop() def delayedInit(self): if not self.m_media: self.m_media = Phonon.MediaObject(self) audioOutput = Phonon.AudioOutput(Phonon.MusicCategory, self) Phonon.createPath(self.m_media, audioOutput) def enqueueNextSource(self): if len(self.playlist) >= self.playlist_pos+1: self.playlist_pos += 1 self.m_media.enqueue(Phonon.MediaSource(self.playlist[self.playlist_pos])) else: self.m_media.stop() Can anyone give me some advice on implementing the effect?

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• What is your favorite pastime to engage in while your project is buidling?

  - by ondesertverge

  As my average project grows in size the sum of build times throughout the day (and night) adds up to a substantial amount of time. Some of the things I or others do in this time include: Reading the news Thinking of ways to advance the project Looking at other projects Throwing darts Checking the unanswered list on stackoverflow.com Build times aren't constant making it hard to plan constructive use of them. I would like to hear of a method in use to make beneficial use of those few minutes that can add up to a few hours.

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• What beginner options are available for someone wanting to get into game programming in C#?

  - by Slateboard

  I know about XNA, but while my PC meets the minimum requirements, my friend's PC lacks a sufficient video card so he has issues with it. I was wondering if there were other options outside of XNA for someone learning programming in C#. I hope I worded that properly.

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• Java certification roadMap

  - by NoProblemBabe

  I am a .net programmer for sometime, and I was thinking about getting a Java certification, but unlike .Net, Java is a mystery to me. What are good certification books? What is the roadmap for the certifications? Is that the best path, or the only path? http://in.sun.com/training/certification/java/ Thank you very much

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• Should I learn two (or more) programming languages in parallel?

  - by c_maker

  I found entries on this site about learning a new programming language, however, I have not come across anything that talks about the advantages and disadvantages of learning two languages at the same time. Let's say my goal is to learn two new languages in a year. I understand that the definition of learning a new language is different for everyone and you can probably never know everything about a language. I believe in most cases the following things are enough to include the language in your resume and say that you are proficient in it (list is not in any particular order): Know its syntax so you can write a simple program in it Compare its underlying concepts with concepts of other languages Know best practices Know what libraries are available Know in what situations to use it Understand the flow of a more complex program At least know most of what you do not know I would probably look for a good book and pick an open source project for both of these languages to start with. My questions: Is it best to spend 5 months learning language#1 then 5 months learning language#2, or should you mix the two. Mixing them I mean you work on them in parallel. Should you pick two languages that are similar or different? Are there any advantages/disadvantages of let's say learning Lisp in tandem with Ruby? Is it a good idea to pick two languages with similar syntax or would it be too confusing? Please tell me what your experiences are regarding this. Does it make a difference if you are a beginner or a senior programmer?

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• wordpress.com to self-hosted wordpress blog

  - by sAc

  Hello, I have been writing articles on the wordpress.com blog, now i am looking to move it to self-hosted wordpress blog but i wonder: 1) Should i move all my articles on the new blog or just put an article on my last blog that more articles will be posted on my new blog? 2) If i move all articles on my new blog, i am not sure about how google will react to it because there are articles with good number of visitors, won't this be seo-un-friendly because i am not sure but google will re-create page reputation stuff, etc or those articles will have same popularity even if i move elsewhere? 3) What are the implications and side-effects in moving from wordpress.com blog to self-hosted wordpress blog? Thanks

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• A Quick-Start Guide of Process Mandatory Level Checking and Self-elevation under UAC

  This example demonstrates how to check the privilege level of the current process, and how to self-elevate the process by giving explicit consent with the Consent UI.

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• Is your test method self-validating ?

  - by mehfuzh

  Writing state of art unit tests that can validate your every part of the framework is challenging and interesting at the same time, its like becoming a samurai. One of the key concept in this is to keep our test synced all the time as underlying code changes and thus breaking them to the furthest unit as possible.  This also means, we should avoid  multiple conditions embedded in a single test. Let’s consider the following example of transfer funds. [Fact] public void ShouldAssertTranserFunds() {     var currencyService = Mock.Create<ICurrencyService>();     //// current rate     Mock.Arrange(() => currencyService.GetConversionRate("AUS", "CAD")).Returns(0.88f);       Account to = new Account { Currency = "AUS", Balance = 120 };     Account from = new Account { Currency = "CAD" };       AccountService accService = new AccountService(currencyService);       Assert.Throws<InvalidOperationException>(() => accService.TranferFunds(to, from, 200f));       accService.TranferFunds(to, from, 100f);       Assert.Equal(from.Balance, 88);     Assert.Equal(20, to.Balance); } At first look,  it seems ok but as you look more closely , it is actually doing two tasks in one test. At line# 10 it is trying to validate the exception for invalid fund transfer and finally it is asserting if the currency conversion is successfully made. Here, the name of the test itself is pretty vague. The first rule for writing unit test should always reflect to inner working of the target code, where just by looking at their names it is self explanatory. Having a obscure name for a test method not only increase the chances of cluttering the test code, but it also gives the opportunity to add multiple paths into it and eventually makes things messy as possible. I would rater have two test methods that explicitly describes its intent and are more self-validating. ShouldThrowExceptionForInvalidTransferOperation ShouldAssertTransferForExpectedConversionRate Having, this type of breakdown also helps us pin-point reported bugs easily rather wasting any time on debugging for something more general and can minimize confusion among team members. Finally, we should always make our test F.I.R.S.T ( Fast.Independent.Repeatable.Self-validating.Timely) [ Bob martin – Clean Code]. Only this will be enough to ensure, our test is as simple and clean as possible.   Hope that helps

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• How Curiosity Took Its Self Portrait [Video]

  - by Jason Fitzpatrick

  There was enough confusion among the public as to how exactly the Curiosity Rover was able to photograph itself without the camera arm intruding into the photo that NASA released this video detailing the process. For those readers familiar with photograph blending and stitching using multiple photo sources, this should come as no surprise. For the unfamiliar, it’s an interesting look at how dozens of photos can be blended together so effectively that the arm–robotic or otherwise–of the photographer can be taken right out. Hit up the link below to read more about how NASA practiced on Earth for the shot and to see a high-res copy of the actual self portrait. Mars Rover Self-Portrait Shoot Uses Arm Choreography [NASA] Secure Yourself by Using Two-Step Verification on These 16 Web Services How to Fix a Stuck Pixel on an LCD Monitor How to Factory Reset Your Android Phone or Tablet When It Won’t Boot

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• Self Documenting Code Vs. Commented Code

  - by Phill

  I had a search but didn't find what I was looking for, please feel free to link me if this question has already being asked. Earlier this month this post was made: http://net.tutsplus.com/tutorials/php/why-youre-a-bad-php-programmer/ Basically to sum it up, you're a bad programmer if you don't write comments. My personal opinion is that code should be descriptive and mostly not require comment's unless the code cannot be self describing. In the example given // Get the extension off the image filename $pieces = explode('.', $image_name); $extension = array_pop($pieces); The author said this code should be given a comment, my personal opinion is the code should be a function call that is descriptive: $extension = GetFileExtension($image_filename); However in the comments someone actually made just that suggestion: http://net.tutsplus.com/tutorials/php/why-youre-a-bad-php-programmer/comment-page-2/#comment-357130 The author responded by saying the commenter was "one of those people", i.e, a bad programmer. What are everyone elses views on Self Describing Code vs Commenting Code?

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