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  • LVM_INSERTITEM very slow in vista/W7

    - by nikos
    in a large listview control collection (say 5000 items), adding a SINGLE extra item can take 10+ seconds in windows vista/7, and that's just the LVM_INSERTITEM message handling it looks that it only affects LVS_ICON, LVS_REPORT and LVS_LIST are still very fast can anybody confirm this? the same code on windows XP with similar listview window styles adds an extra item instantly thanks nikos

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  • Multiple Jquery modal Dialog Boxes in one page?

    - by Ryan Max
    Hi, I am brand stinking new to jquery and attempting to have a "Services" page for a tech website I am working on. I am having trouble with different services opening the same info in the window. Basically I am using the code straight from the demo. Any ideas on how to have multiple windows in the same page? Thanks!

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  • Precise explanation of JavaScript <-> DOM circular reference issue

    - by Joey Adams
    One of the touted advantages of jQuery.data versus raw expando properties (arbitrary attributes you can assign to DOM nodes) is that jQuery.data is "safe from circular references and therefore free from memory leaks". An article from Google titled "Optimizing JavaScript code" goes into more detail: The most common memory leaks for web applications involve circular references between the JavaScript script engine and the browsers' C++ objects' implementing the DOM (e.g. between the JavaScript script engine and Internet Explorer's COM infrastructure, or between the JavaScript engine and Firefox XPCOM infrastructure). It lists two examples of circular reference patterns: DOM element → event handler → closure scope → DOM DOM element → via expando → intermediary object → DOM element However, if a reference cycle between a DOM node and a JavaScript object produces a memory leak, doesn't this mean that any non-trivial event handler (e.g. onclick) will produce such a leak? I don't see how it's even possible for an event handler to avoid a reference cycle, because the way I see it: The DOM element references the event handler. The event handler references the DOM (either directly or indirectly). In any case, it's almost impossible to avoid referencing window in any interesting event handler, short of writing a setInterval loop that reads actions from a global queue. Can someone provide a precise explanation of the JavaScript ↔ DOM circular reference problem? Things I'd like clarified: What browsers are effected? A comment in the jQuery source specifically mentions IE6-7, but the Google article suggests Firefox is also affected. Are expando properties and event handlers somehow different concerning memory leaks? Or are both of these code snippets susceptible to the same kind of memory leak? // Create an expando that references to its own element. var elem = document.getElementById('foo'); elem.myself = elem; // Create an event handler that references its own element. var elem = document.getElementById('foo'); elem.onclick = function() { elem.style.display = 'none'; }; If a page leaks memory due to a circular reference, does the leak persist until the entire browser application is closed, or is the memory freed when the window/tab is closed?

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  • Can you add items to a context menu in a parents menu?

    - by Joel Barsotti
    or conversly can you import a parents menu items into a child window? So I have an UI that is composed of controls that all have their own context menu, but we also have a datagrid that get's nested inside our generic contaier. So when you right click the datagrid elements I want to show both the context items I've created for the datagrid and the items from the generic container.

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  • close button only for some tabs in Qt

    - by Costy
    Hello, I am using Qt for an assignment I have for college, and I want to use QTabWidget to display a chat window much like Pidgin's. I want to make the "group chat" tab always open and impossible to close and the rest of the "private channel" tabs closable. QTabWidget's setTabsClosable(bool) is not helping ... any ideas? ty

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  • how to use drawItems() in PyQt?

    - by DSblizzard
    I have these two code fragments in program: class TGraphicsView(QGraphicsView): def __init__(self, parent = None): print("__init__") QGraphicsView.__init__(self, parent) def drawItems(self, Painter, ItemCount, Items, StyleOptions): print("drawItems") Brush = QBrush(Qt.red, Qt.SolidPattern) Painter.setBrush(Brush) Painter.drawEllipse(0, 0, 100, 100) ... Mw.gvNavigation = TGraphicsView(Mw) # Mw - main window Mw.gvNavigation.setGeometry(0, 0, Size1, Size1) Mw.gvNavigation.setScene(Mw.Scene) Mw.gvNavigation.setSceneRect(0, 0, Size2, Size2) Mw.gvNavigation.show() _init_ works, Mw.gvNavigation is displayed and there are Mw.Scene items in it, but drawItems() isn't called. Please explain, what I'm doing wrong.

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  • Accessing non-static combbox property in the static method.

    - by Harikrishna
    I have one combobox on the window form and I have one method which is declared with static like private static DataTable ParseTable(HtmlNode table) Now I want to use combobox in that method for using combobox property but I can not access any property of combobox or combobox itself.If I made the combobox declaration as static then it can be accessed in that static method.But any alternative way to access combbox property in that static method because I don't want to make combobox declaration as static.

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  • WMDC not starting?

    - by Madhup
    Hi all, I am trying to start windows mobile device center on windows 7 machine. But it only shows me the small green window that is shown at loading time and then it is closed automatically. I am not getting what the problem is. I tried to uninstall the previous update then re-installed again but the problem is not gone. Guys please help me out. I need to debug my app and submit its build today. Thanks, Madhup

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  • wpf working state

    - by taras.roshko
    Hi, I have a grid in my application. After user selects some files in ofdialog application processes some calculations. While app is making calculations it looks like it is not responding. How to display some picture and make main window in black&white while calculating? Maybe make some dp in MainWindow a la "IsBusy" and bind a popup with picture to it? How you implement this logic in yours apps?

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  • string variable not able to get thevalue

    - by prince23
    hi, i have an variable declated as an object Object obj =e.Row.DataContext; when i go to immediate window and check the value i get like this ?Object obj =e.Row.DataContext; {TempTypeMinus1487405295} People: "7,556,930" Name: "India" string strcounty =obj .Tostring(); now in strcounty i should get as India but i am getting the value as TempTypeMinus1487405295 how can i get the value india in string variable thanks in advance

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  • Run function in infinite loop

    - by zac
    I am creating a background color animation with jQuery and the color animation plugin http://plugins.jquery.com/project/color How do I have a function stay in a loop repeating itself each time it has finished running? I tried this but it did not work : function colorLoop(){ $("#window") .animate({ backgroundColor: "orange" }, 11000) .animate({ backgroundColor: "violet" }, 1000) .animate({ backgroundColor: "red" }, 1000, colorLoop); };

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  • How to bind to localStorage change event using jQuery for all browsers?

    - by David Glenn
    How do I bind a function to the HTML5 localStorage change event using jQuery? $(function () { $(window).bind('storage', function (e) { alert('storage changed'); }); localStorage.setItem('a', 'test'); }); I've tried the above but the alert is not showing. Update: It works in Firefox 3.6 but it doesn't work in Chrome 8 or IE 8 so the question should be more 'How to bind to localStorage change event using jQuery for all browsers?'

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  • UINavigation Bar while moving view for writing in a textfield

    - by ObiWanKeNerd
    i'm using this code to move the view when i'm about to type on a textfield, otherwise the keyboard may cover the textfield if it's in the lower side of the screen. I would like to know if there is a way to maintain the UINavigation Bar in it's place, because with this code the bar will move with all the view outside the screen, becoming untouchable until i end editing the textfield (closing the keyboard). CGFloat animatedDistance; static const CGFloat KEYBOARD_ANIMATION_DURATION = 0.3; static const CGFloat MINIMUM_SCROLL_FRACTION = 0.2; static const CGFloat MAXIMUM_SCROLL_FRACTION = 0.8; static const CGFloat PORTRAIT_KEYBOARD_HEIGHT = 216; static const CGFloat LANDSCAPE_KEYBOARD_HEIGHT = 162; - (void)textFieldDidBeginEditing:(UITextField *)textField { CGRect textFieldRect = [self.view.window convertRect:textField.bounds fromView:textField]; CGRect viewRect = [self.view.window convertRect:self.view.bounds fromView:self.view]; CGFloat midline = textFieldRect.origin.y + 0.5 * textFieldRect.size.height; CGFloat numerator = midline - viewRect.origin.y - MINIMUM_SCROLL_FRACTION * viewRect.size.height; CGFloat denominator = (MAXIMUM_SCROLL_FRACTION - MINIMUM_SCROLL_FRACTION) * viewRect.size.height; CGFloat heightFraction = numerator / denominator; if (heightFraction < 0.0) { heightFraction = 0.0; } else if (heightFraction > 1.0) { heightFraction = 1.0; } UIInterfaceOrientation orientation = [[UIApplication sharedApplication] statusBarOrientation]; if (orientation == UIInterfaceOrientationPortrait || orientation == UIInterfaceOrientationPortraitUpsideDown) { animatedDistance = floor(PORTRAIT_KEYBOARD_HEIGHT * heightFraction); } else { animatedDistance = floor(LANDSCAPE_KEYBOARD_HEIGHT * heightFraction); } CGRect viewFrame = self.view.frame; viewFrame.origin.y -= animatedDistance; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; [self.view setFrame:viewFrame]; [UIView commitAnimations]; } - (void)textFieldDidEndEditing:(UITextField *)textField { CGRect viewFrame = self.view.frame; viewFrame.origin.y += animatedDistance; [UIView beginAnimations:nil context:NULL]; [UIView setAnimationBeginsFromCurrentState:YES]; [UIView setAnimationDuration:KEYBOARD_ANIMATION_DURATION]; [self.view setFrame:viewFrame]; [UIView commitAnimations]; } Thanks in advance!

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  • jsp chatting with ajax

    - by paramesh
    Hi sirs, I am writing one web chat program using AJAX (a little bit). It is working when both users open a chat page, but I want to open a window when one user send data to others.

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  • IE Not Picking up Blur Event (jQuery)

    - by Jascha
    I did a quick search, but couldn't find a specific solution to this (I'm sure it HAS been answered) but, I need to figure this out... Anyone know why this won't work in IE? $(document).ready(function() { $(document).blur(function() { window.close(); }); }); And what to do instead? Thanks.

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  • appcelerator tableview autosliding

    - by matthewb
    Using Appcelerator: I have a form, a tableView with textFeilds I want it so when I focus on them, it slides the window or the view to the top, under the navigation bar. Right now, the keyboard is blocking the last few rows. Do I need a listener on each form to slide? If so how do you do that?

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  • How can we receive a volume attaching notification

    - by Benjamin
    When a volume is attached to file system, on Windows, the Window explorer detects the volume and refreshes automatically. I wonder the technique. How do an program(include device driver) get the notification? -Of course, it doesn’t mean a polling. I want to get an event(or a message). I would like to get the notification when a network volume(like SMB) is attached. Thanks in advance.

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  • Activate Lightbox by clicking on LI rather than thumbnail

    - by NightMICU
    Hi everyone, Using Lightbox for a photo gallery and would like to initiate the function by clicking on the thumbnail's parent <li>rather than the thumbnail image. I have been able to do this easily with the thumbnail for the album (not using Lightbox, simply opening another page) with the following code: $(".item").click(function(){ window.location=$(this).find("a").attr("href");return false; }); However, can't seem to initiate Lightbox in a similar fashion. Ideas? Thanks!

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