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  • How to add a slot to my main window in Qt builder?

    - by George Edison
    I am using Qt Builder to create a simple window. I used the menu editor to add a menu. Now, I figured out how to connect one of the menu items to the close() method of the main window. My problem is how to add a slot to the main window. Here is what I have: private slots: void OnAbout(); However, I can't get this method to show up in the 'Signals and Slots Editor'. How can I get it to show up?

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  • jQuery UI problem: why do the elements go flying around the screen?

    - by George Edison
    Yes, I know the title sounds a little suspicious. I will try to explain this the best I can... The code below is supposed to have the blue div slide down beside the red div. The first time you hit the Show the div button, it works. Also, the Hide the div works. Then when I click to show the div again, it appears to the right of where it is supposed to be! Why is this?!? Note: You can find a live example of the code here <html> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> <head> <title>Demo</title> <style type='text/css'> #red { background-color: red; width: 200px; height: 150px; position: absolute; } #blue { background-color: blue; width: 150px; height: 200px; position: absolute; display: none; } #tester_1 { top: 300px; left: 300px; position: absolute; } #tester_2 { top: 350px; left: 300px; position: absolute; } </style> </head> <script type="text/javascript" src="jquery.js"></script> <script type='text/javascript'> function Show() { $('#blue').position({ of: $('#red'), my: 'left top', at: 'right top'}).slideDown(); } function Hide() { $('#blue').hide(); } </script> <body> <div id='red'></div> <div id='blue'></div> <button id='tester_1' onclick='Show()'>Show the <kbd>div</kbd></button> <button id='tester_2' onclick='Hide()'>Hide the <kbd>div</kbd></button> </body> </html>

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  • How to refer to object in JavaScript event handler?

    - by George Edison
    Note: This question uses jQuery but the question has nothing to do with jQuery! Okay so I have this object: var box = new BigBox(); This object has a method named Serialize(): box.AddToPage(); Here is the method AddToPage(): function AddToPage() { $('#some_item').html("<div id='box' onclick='this.OnClick()'></div>"); } The problem above is the this.OnClick() (which obviously does not work). I need the onclick handler to invoke a member of the BigBox class. How can I do this? How can an object refer to itself in an event handler?

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  • How do I remove a <tr> with jQuery?

    - by George Edison
    Okay, I am really stuck here. I have a table of tr's that have id's: #tr_xx where xx is a number. item is a number. The if(... part makes sure that what follows is only executed once at the end of all the animations. $('#tr_' + item + '>td').fadeOut('slow', function() { if($('#tr_' + item + '>td:animated').length === 0) { $(this).parent().remove(); // This function recolors the rows // -not really related to this Recolor(); } }); The problem is that the tr does not get deleted. It just gets hidden. How can I delete the <tr> and not just hide it?

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  • Is there a way to be notified when the user makes changes in a wxStyledTextCtrl?

    - by George Edison
    I have a wxWidgets application that has a wxStyledTextCtrl. But for the life of me, I cannot figure out how to get notified of modification events. I have the following code: void CMainWindow::OnDocumentModified(wxStyledTextEvent & event) { wxString msg; msg << event.GetModificationType(); wxMessageBox(msg); } This gets called for EVT_STC_MODIFIED. When I run the application and press a key, the message box displays 1040 and 8209. When I call SetText the same two messages are displayed. How can I differentiate between user events and programmatically-generated events?

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  • What is the future of C++?

    - by George Edison
    Given the rise in popularity of C# and others, (which you can point out in the comments) what future does C++ have? Consider that most OS code is a mix of Asm/C/C++ and a lot of FOSS still use it. Also consider the upcoming C++0x standard that brings a few changes to the mix.

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  • Why isn't IE displaying this alert()?

    - by George Edison
    I have the following piece of code: // setup the AJAX request var pageRequest = false; if(window.XMLHttpRequest) pageRequest = new XMLHttpRequest(); else if(window.ActiveXObject) pageRequest = new ActiveXObject("Microsoft.XMLHTTP"); // callback pageRequest.onreadystatechange = function() { alert('pageRequest.readyState: ' + pageRequest.readyState + '\npageRequest.status: ' + pageRequest.status); } pageRequest.open('POST','ajax.php',true); // q_str contains something like 'data=value...' pageRequest.setRequestHeader("Content-type", "application/x-www-form-urlencoded"); pageRequest.setRequestHeader("Content-length", q_str.length); pageRequest.setRequestHeader("Connection", "close"); pageRequest.send(q_str); This works fine in Chrome, but IE chokes on it, spitting out an "Unspecified error." and it points to the line with the alert() in it. Why can't it display the alert?

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  • Is it wise to rely on default features of a programming language?

    - by George Edison
    Should I frequently rely on default values? For example, in PHP, if you have the following: <?php $var .= "Value"; ?> This is perfectly fine - it works. But what if assignment like this to a previously unused variable is later eliminated from the language? (I'm not referring to just general assignment to an unused variable.) There are countless examples of where the default value of something has changed and so much existing code was then useless. On the other hand, without default values, there is a lot of code redundancy. What is the proper way of dealing with this?

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  • What speech libraries are available in Linux?

    - by George Edison
    When it comes to TTS (text-to-speech) libraries in Linux, what choices do developers have? What libraries ship with the majority of distros? Are there minimal libraries? What functionality does each library offer? I'm approaching this primarily from a C++ point of view, although Python would suit me too.

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  • How to compile a Windows binary in Ubuntu?

    - by George Edison
    I have a Qt application that I can compile in Ubuntu 10.04 64-bit and on Windows. However, I would like to avoid switching to Windows every time I want to compile the Windows version. Is there a way I can compile a Windows Qt executable in Ubuntu with mingw32 or something? Further, is there a way to integrate that compiler into Qt Creator?

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  • How could I know if an object is derived from a specific generic class?

    - by Edison Chuang
    Suppose that I have an object then how could I know if the object is derived from a specific generic class. For example: public class GenericClass<T> { } public bool IsDeriveFrom(object o) { return o.GetType().IsSubclassOf(typeof(GenericClass)); //will throw exception here } please notice that the code above will throw an exception. The type of the generic class cannot be retrieved directly because there is no type for a generic class without a type parameter provided.

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  • What do you think of Visual Studio 2010?

    - by George Edison
    Since it came out a few days ago, I am sure at least some members of SO had a chance to try it out. For those that did, I wonder if you could share the following: Whether you liked/disliked it What you liked/disliked Whether it's worth upgrading To ensure fairness (and to make the mods happy) I will make this CW.

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  • Why does this PNG file look so poorly when embedded as a resource in a Qt project?

    - by George Edison
    Here is the PNG file and what it looks like in a QWebView when accessed via http://sstatic.net/so/img/logo.png: When accessed via HTTP: <img src="http://sstatic.net/so/img/logo.png" width='250' height='61' /> When accessed via a resource: <img src="qrc:/images/logo.png" width='250' height='61' /> As you can see, the only modification was the src attribute of the image tag... why the drop in quality? Edit: The file is being shrunk via width: and height: in the style attribute, if that makes a difference. I updated the code.

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  • How to make this jQuery snippet work in Internet Explorer?

    - by George Edison
    If there was ever a time to hate IE, this is it. This code begins with a box with content. When the button is clicked, the box is supposed to drop down and fade-in. <html> <script type="text/javascript" src="jquery.js"></script> <script type='text/javascript'> function Test() { var item_height = $('#test').height(); $('#test').height(0); $('#test').css('opacity','0'); $('#test').animate({ height: item_height, opacity: '1' },400); } </script> <body> <!-- The div below holds the sample content --> <div id="test" style='border: 1px solid black;'> Content<br> Content<br> Content<br> Content<br> Content </div> <!-- The button to test the animation --> <br><br> <div style='position: absolute; top: 150px; left: 10px;'> <button onclick='Test();'>Test</button> </div> </body> </html> This very simple example works on Chrome, Safari, and Opera. But Internet Explorer? No. How can I (if it's even possible) fix this so that it works in IE?

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  • Why won't these two mod_rewrite rules work together?

    - by George Edison
    Here is what I have: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^users/(\d+)/post$ post.php [L] RewriteRule ^users/(\d+)$ user.php?id=$1 [L] The first rule doesn't work. The second one does. All I get when I enter .../users/1/post is a 404 error. What am I doing wrong? Edit: The error log doesn't have anything in it relating to this.

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  • How come the [L] flag isn't working in my .htaccess file?

    - by George Edison
    Here are the rules: <IfModule mod_rewrite.c> RewriteEngine on RewriteRule ^$ index.php?action=home [L] RewriteRule ^[\w\W]*$ error.php [L] When a page matches the first one, it is supposed to ignore any other further rules. Yet accessing / results in error.php being invoked. Commenting out the second rule works as intended - the page redirects to index.php. What am I doing wrong? Also: is there a better way to write the last line? It's basically a catch-all.

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