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  • QLineEdit: how to handle up and down arrows?

    - by Eye of Hell
    Hello. I have a console input in my Qt based application, it's a QLineEdit, all Ui is designed via QtDesigner. Is it any easy way way to handle up and down arrows in order to implement input history? The 'go to slot' only show returnProcessed signal, no way i can see to handle up and down arrows :(

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  • functional dependencies vs type families

    - by mhwombat
    I'm developing a framework for running experiments with artificial life, and I'm trying to use type families instead of functional dependencies. Type families seems to be the preferred approach among Haskellers, but I've run into a situation where functional dependencies seem like a better fit. Am I missing a trick? Here's the design using type families. (This code compiles OK.) {-# LANGUAGE TypeFamilies, FlexibleContexts #-} import Control.Monad.State (StateT) class Agent a where agentId :: a -> String liveALittle :: Universe u => a -> StateT u IO a -- plus other functions class Universe u where type MyAgent u :: * withAgent :: (MyAgent u -> StateT u IO (MyAgent u)) -> String -> StateT u IO () -- plus other functions data SimpleUniverse = SimpleUniverse { mainDir :: FilePath -- plus other fields } defaultWithAgent :: (MyAgent u -> StateT u IO (MyAgent u)) -> String -> StateT u IO () defaultWithAgent = undefined -- stub -- plus default implementations for other functions -- -- In order to use my framework, the user will need to create a typeclass -- that implements the Agent class... -- data Bug = Bug String deriving (Show, Eq) instance Agent Bug where agentId (Bug s) = s liveALittle bug = return bug -- stub -- -- .. and they'll also need to make SimpleUniverse an instance of Universe -- for their agent type. -- instance Universe SimpleUniverse where type MyAgent SimpleUniverse = Bug withAgent = defaultWithAgent -- boilerplate -- plus similar boilerplate for other functions Is there a way to avoid forcing my users to write those last two lines of boilerplate? Compare with the version using fundeps, below, which seems to make things simpler for my users. (The use of UndecideableInstances may be a red flag.) (This code also compiles OK.) {-# LANGUAGE MultiParamTypeClasses, FunctionalDependencies, FlexibleInstances, UndecidableInstances #-} import Control.Monad.State (StateT) class Agent a where agentId :: a -> String liveALittle :: Universe u a => a -> StateT u IO a -- plus other functions class Universe u a | u -> a where withAgent :: Agent a => (a -> StateT u IO a) -> String -> StateT u IO () -- plus other functions data SimpleUniverse = SimpleUniverse { mainDir :: FilePath -- plus other fields } instance Universe SimpleUniverse a where withAgent = undefined -- stub -- plus implementations for other functions -- -- In order to use my framework, the user will need to create a typeclass -- that implements the Agent class... -- data Bug = Bug String deriving (Show, Eq) instance Agent Bug where agentId (Bug s) = s liveALittle bug = return bug -- stub -- -- And now my users only have to write stuff like... -- u :: SimpleUniverse u = SimpleUniverse "mydir"

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  • HTML5 applicationCache in local development

    - by jesper
    I'm experimenting with application cache based on this example: http://html5demos.com/html5demo.manifest This example works fine in ff, but when I create analogous site (almost identical) I get only status "UNCACHED (numeric value 0) -- The ApplicationCache object's cache host is not associated with an application cache at this time." I work on xampp and I've set correct mime-type. When the page is loading ff "is asking to store data on your computer for offline use" and when I show Tools - Options - Advanced - Network - Offline data there is localhost but with 0B size.

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  • How do you access the Source Error, Source File and Line Number of an exception to use in a custom e

    - by Iain Fraser
    Basically I want to take the following: And make it match the styling of the rest of the application. I am creating a custom error page in my C# based project and I want it to be able to show the same information that is displayed in the ASP.NET default error page. From fiddling with reflector I can see that this is generated through HttpException.GetHtmlErrorMessage() but when I try to use this in my exception it returns null.

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  • Displaying paragraphs in HTML

    - by Roy
    Hi all, I'm writing a web application which needs to bring the stored paragraphs into the front web. The text come from excel work sheet and contains control characters like indent. I want to show the text in the exactly manner as it was in excel. How can I do that then? Thanks in advance.

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  • reuse of mvc view

    - by user344394
    I'm working on the MVC app where I've to generate the report in the form of HTML page. If the user click the print icon, I've to show the HTML page to user. If the user click on email icon, I've to send email with same HTML page attachment. I'm trying to find a way where I can use the same code to generate the HTML in both cases of email and print. Please provide your suggestions.

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  • jqeury: best way to place dom element in the center of viewport

    - by Anthony Koval'
    hello! i'm looking for a proper way of placing popup div-elemnt in the center of current view area. for example: we have some div element with {display:none; position:absolute} and few buttons, one on the top of document, second in the center and last one, somewhere in the bottom. By clicking on any of this button, div should appear in the center of current viewing area $(".btnClass").click(function(){ //some actions for positioning here $(div_id).show() })

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  • Modules in Flex

    - by theband
    <?xml version="1.0"?> <!-- This module loads an image. --> <mx:Module width="100%" height="100%" xmlns:mx="http://www.adobe.com/2006/mxml"> <mx:Image source="trinity.gif"/> </mx:Module> I have such 10 modules. Is there any Method in Module Class where i can hide and show based on user login.

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  • WPF Application Deployment Problem

    - by deep
    i created a WPF application and i added a setup solution and i did everything to deploy the project and i got my setup.msi i installed it in my system, The problem is my application is running in task manager, but i cant see my application any where in desktop or start menu,but tast manager process show that my application is running. whats the problem??

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  • HttpWebRequest ReadWriteTimeout ignored in .NET; works in Mono

    - by jimvfr
    When writing data to a web server, my tests show HttpWebRequest.ReadWriteTimeout is ignored, contrary to the MSDN spec. For example if I set ReadWriteTimeout to 1 (=1 msec), call myRequestStream.Write() passing in a buffer that takes 10 seconds to transfer, it transfers successfully and never times out using .NET 3.5 SP1. The same test running on Mono 2.6 times out immediately as expected. What could be wrong?

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  • Django: get count of ForeignKey item in template?

    - by AP257
    Straightforward question - apologies if it is a duplicate, but I can't find the answer if so. I have a User model and a Submission model, like this: class Submission(models.Model): uploaded_by = models.ForeignKey('User') class User(models.Model): name = models.CharField(max_length=250 ) How can I show the number of Submissions made by each user in the template? I've tried {{ user.submission.count }}, like this: for user in users: {{ user.name }} ({{ user.submission.count }} submissions) but no luck...

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  • Microsoft Blend 3 - Add Silverlight SDK Themes

    - by photo_tom
    I'm working on my first WPF project and would like to use one of the themes that I see in the Silverlight Tool Kit. All the help I've found is for Expression 2 and they show a different version of the Asset Tab. Can someone advise me how to do this. It looks like it should be simple, but I'm not seeing it.

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  • Load a list of localized strings at once in IOS

    - by Victor Ronin
    I want to show a table with the list of strings which are localized. The straightforward method would be: a) Point data source to my ViewController b) Define an array c) Allocate the array in my ViewController and init (arrayWithObjects) it with the strings from localized resources (NSLocalizedString) d) Use this array in UITableViewDataSource delegated methods Mainly my concern is item b). The construction looks quite heavy and I wonder whether I can somehow specify and load whole list of localized string at once.

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  • RewriteRule question

    - by NegativeCrack
    Is there any way i can use RewriteRule to show these links: /articles_history.php /articles_geography.php as /articles/history.html /articles/geography.html I created a .htacesss file on my root directory and would like to know if the above is possible by placing some kind of code in the .htaccess file.

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  • Update an Android market app to lower sdk?

    - by Tom Richards
    I have an app on the market that requires sdk 2.0 I want to rewrite and publish it using 1.6 to find a wider audience. The question is: if I update my already published app with an sdk downgrade to 1.6 will it then show up to users with phones at 1.6? I know currently the market search shows my app only to those that have 2.0 phones.

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  • How to Make a Plugin for Chrome ( dll ) like RealPlayer Download and Record Plugin ( capturing media

    - by uenx
    Hi guys. I'm trying to make a media Download bar for Chrome Browser like Real Player's one ( a DLL plugin ) Whenever you open a page which contents "media stream" like Youtube..., it will show a download bar at the left-top corner of the flash player - allow you to download this video/song to your computer. How does it capture the video url of the flash-player? Which method and language( C++ or C# ) do I have to use? Thanks in Advance :) ( and so sorry for bad English )

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  • dynamically embedding youtube videos with jquery

    - by danwoods
    Hello all, I'm trying to retrieve a listing of a user's youtube videos and embed them in a page using jQuery. My code looks something like this: $(document).ready(function() { //some variables var fl_obj_template = $('<object width="260" height="140">' + '<param name="movie" value=""></param>' + '<param name="allowFullScreen" value="true"></param>' + '<param name="allowscriptaccess" value="always"></param>' + '<embed src="" type="application/x-shockwave-flash" allowscriptaccess="always" allowfullscreen="true" width="260" height="140"></embed>' + '</object>'); var video_elm_arr = $('.video'); //hide videos until ready $('.video').addClass('hidden'); //pull video data from youtube $.ajax({ url: 'http://gdata.youtube.com/feeds/api/users/username/uploads?alt=json', dataType: 'jsonp', success: function(data) { $.each(data.feed.entry, function(i,item){ //only take the first 7 videos if(i > 6) return; //give the video element a flash object var cur_flash_obj = fl_obj_template; //assign title $(video_elm_arr[i]).find('.video_title').html(item.title.$t); //clean url var video_url = item.media$group.media$content[0].url; var index = video_url.indexOf("?"); if (index > 0) video_url = video_url.substring(0, index); //and asign it to the player's parameters $(cur_flash_obj).find('object param[name="movie"]').attr('value', video_url); $(cur_flash_obj).find('object embed').attr('src', video_url); //alert(cur_flash_obj); //insert flash object in video element $(video_elm_arr[i]).append(cur_flash_obj); //and show $(video_elm_arr[i]).removeClass('hidden'); }); } }); }); (of course with 'username' being the actual username). The video titles appear correctly but no videos show up. What gives? The target html looks like: <div id="top_row_center" class="video_center video"> <p class="video_title"></p> </div>

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