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  • Are UML class diagrams adequated to design javascript systems?

    - by Vandell
    Given that UML is oriented towards a more classic approach to object orientation, is it still usable in a reliable way to design javascript systems? One specific problem that I can see is that class diagrams are, in fact, a structural view of the system, and javascript is more behaviour driven, how can you deal with it? Please, keep in mind that I'm not talking abot the real world domain here, It's a model for the solution that I'm trying to achieve.

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  • How to refactor my design, if it seems to require multiple inheritance?

    - by Omega
    Recently I made a question about Java classes implementing methods from two sources (kinda like multiple inheritance). However, it was pointed out that this sort of need may be a sign of a design flaw. Hence, it is probably better to address my current design rather than trying to simulate multiple inheritance. Before tackling the actual problem, some background info about a particular mechanic in this framework: It is a simple game development framework. Several components allocate some memory (like pixel data), and it is necessary to get rid of it as soon as you don't need it. Sprites are an example of this. Anyway, I decided to implement something ala Manual-Reference-Counting from Objective-C. Certain classes, like Sprites, contain an internal counter, which is increased when you call retain(), and decreased on release(). Thus the Resource abstract class was created. Any subclass of this will obtain the retain() and release() implementations for free. When its count hits 0 (nobody is using this class), it will call the destroy() method. The subclass needs only to implement destroy(). This is because I don't want to rely on the Garbage Collector to get rid of unused pixel data. Game objects are all subclasses of the Node class - which is the main construction block, as it provides info such as position, size, rotation, etc. See, two classes are used often in my game. Sprites and Labels. Ah... but wait. Sprites contain pixel data, remember? And as such, they need to extend Resource. But this, of course, can't be done. Sprites ARE nodes, hence they must subclass Node. But heck, they are resources too. Why not making Resource an interface? Because I'd have to re-implement retain() and release(). I am avoiding this in virtue of not writing the same code over and over (remember that there are multiple classes that need this memory-management system). Why not composition? Because I'd still have to implement methods in Sprite (and similar classes) that essentially call the methods of Resource. I'd still be writing the same code over and over! What is your advice in this situation, then?

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  • Oracle Launches Mobile User Experiences Design Patterns

    - by asantaga
    Mobile design requires a different way of thinking. Use Oracle’s mobile design patterns to design iPhone, Android, or browser-based smartphone applications.  We are sharing our mobile design patterns and their baked-in, scientifically proven usability to enable Oracle customers and partners to build mobile apps quickly. Our design patterns are common solutions that developers can easily apply across all application suite products. Crafted by our insight into Oracle Fusion Middleware, the patterns are designed to work with the mobile technology provided by the Oracle Application Development Framework.  Normal 0 false false false false EN-US JA X-NONE

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  • Are UML class diagrams adequate to design javascript systems?

    - by Vandell
    Given that UML is oriented towards a more classic approach to object orientation, is it still usable in a reliable way to design javascript systems? One specific problem that I can see is that class diagrams are, in fact, a structural view of the system, and javascript is more behaviour driven, how can you deal with it? Please, keep in mind that I'm not talking abot the real world domain here, It's a model for the solution that I'm trying to achieve.

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  • When will the Unity Greeter begin to look like the propositions from the Design Team?

    - by Marcappuccino
    The Canonical Design Team gave a rather beautiful login screen mockup for the unity greeter. These designs, in my opinion far exceed the current UI that we have for Quantal (which I think is worse, apart from remote login), and I was led to beleive that these were the official guidelines for the greeter. Are there plans to implement these designs into the Unity Greeter? The proposal is here: https://docs.google.com/a/canonical.com/document/d/1ypvxcSmwNKKMZawit-0r6uLnbTxoA-XoyB0ZNCKNMSg/edit?pli=1 The mockups are here: https://docs.google.com/a/canonical.com/file/d/0BzP7juF4TDpQS3JCWmtHTmR6OVk/edit?pli=1

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  • is a factory pattern to prevent multuple instances for same object (instance that is Equal) good design?

    - by dsollen
    I have a number of objects storing state. There are essentially two types of fields. The ones that uniquly define what the object is (what node, what edge etc), and the oens that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methdos, so these objects all act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approch which accepts a Builder object and construct the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquly defines the type of object (this is node A nto node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows it's state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overiding of serlization methods to make it work (ensure when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in it's place), as well as using a weakHashMap as if it was a weakHashSet to know rather an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to it's own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state taht is different then my memory; to tell my memory when it's own state is inconsistent. I believe this is possible despit their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect I'm posting).

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  • Is there a factory pattern to prevent multiple instances for same object (instance that is Equal) good design?

    - by dsollen
    I have a number of objects storing state. There are essentially two types of fields. The ones that uniquely define what the object is (what node, what edge etc), and the others that store state describing how these things are connected (this node is connected to these edges, this edge is part of these paths) etc. My model is updating the state variables using package methods, so all these objects act as immutable to anyone not in Model scope. All Objects extend one base type. I've toyed with the idea of a Factory approach which accepts a Builder object and constructs the applicable object. However, if an instance of the object already exists (ie would return true if I created the object defined by the builder and passed it to the equal method for the existing instance) the factory returns the current object instead of creating a new instance. Because the Equal method would only compare what uniquely defines the type of object (this is node A to node B) but won't check the dynamic state stuff (node A is currently connected to nodes C and E) this would be a way of ensuring anyone that wants my Node A automatically knows its state connections. More importantly it would prevent aliasing nightmares of someone trying to pass an instance of node A with different state then the node A in my model has. I've never heard of this pattern before, and it's a bit odd. I would have to do some overriding of serialization methods to make it work (ensure that when I read in a serilized object I add it to my facotry list of known instances, and/or return an existing factory in its place), as well as using a weakHashMap as if it was a weakHashSet to know whether an instance exists without worrying about a quasi-memory leak occuring. I don't know if this is too confusing or prone to its own obscure bugs. One thing I know is that plugins interface with lowest level hardware. The plugins have to be able to return state that is different than my memory; to tell my memory when its own state is inconsistent. I believe this is possible despite their fetching objects that exist in my memory; we allow building of objects without checking their consistency with the model until the addToModel is called anyways; and the existing plugins design was written before all this extra state existed and worked fine without ever being aware of it. Should I just be using some other design to avoid this crazyness? (I have another question to that affect that I'm posting).

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  • Search Engine Optimisation & Website Design - The Reasons and Rewards of Starting Your Own Business

    The story of starting a web design company in 2010. Written as encouragement for anyone thinking of starting their own business, whether a web design company or any other business for that matter. The telling of this web design company development will include tips, pointers, advice, experiences, do's and don'ts but most importantly will give inspiration and hope to anyone thinking of going it alone, and wandering where to begin. This article will take you through the various stages of development from that initial idea to where we are now with a successful, expanding business offering Search Engine Optimisation, Website Design, Graphic Design and Client Management Systems.

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  • Correctly calling setGridWidth on a jqGrid inside a jQueryUI Dialog

    - by Dan
    I have a jQueryUI dialog (#locDialog) which has a jqGrid ($grid) inside it. When the Dialog opens (initially, but it gets called whenever it opens), I want the $grid to resize to the size of the $locDialog. When I do this initially, I get scrollbars inside the grid (not inside the dialog). If I debug the code, I see the width of the $grid is 677. So, I call setGridWidth() again and check the width and now I have 659, which is 18px less, which is the size of the scroll area for the jqGrid (Dun-dun-dun..) When I rezie the dialog, I resize the grid as well, and everything is happy - no scrollbars, except where necessary. My dialog init code: $locDialog = $('#location-dialog').dialog({ autoOpen: false, modal: true, position: ['center', 100], width: 700, height:500, resizable: true, buttons: { "Show Selected": function() {alert($('#grid').jqGrid('getGridParam','selarrrow'));}, "OK": function() {$(this).dialog('close');}, "Cancel": function() {$(this).dialog('close');} }, open: function(event, ui) { $grid.setGridHeight($(this).height()-54); // No idea why 54 is the magic number here $grid.setGridWidth($(this).width(), true); }, close: function(event, ui) { }, resizeStop: function(event, ui) { $grid.setGridWidth($locDialog.width(), true); $grid.setGridHeight($locDialog.height()-54); } }); I am curious if anyone has seen this before. Really, it isn't the end of the world if I initially have unnecessary scrollbars at first, but it is just odd that when I call setGridWidth initially, it doesn't take into account the scroll area of 18px. As far as the magical number 54, that is the number I had to subtract from the height of the dialog value to get the grid to render without unnecessary scrollbars.

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  • asp.net:Invalid temp directory in chart handler configuration [c:\TempImageFiles\].

    - by veda
    I am getting this error Invalid temp directory in chart handler configuration [c:\TempImageFiles\]. While running my code. Intially I was getting No http handler was found for request type ‘GET’ error which I solved it by referring no http handler But now I am getting the above error The details of the error are Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.IO.DirectoryNotFoundException: Invalid temp directory in chart handler configuration [c:\TempImageFiles\]. Source Error: An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. The stackTrace of this error [DirectoryNotFoundException: Invalid temp directory in chart handler configuration [c:\TempImageFiles\].] System.Web.UI.DataVisualization.Charting.ChartHttpHandlerSettings.Inspect() +851 System.Web.UI.DataVisualization.Charting.ChartHttpHandlerSettings.ParseParams(String parameters) +1759 System.Web.UI.DataVisualization.Charting.ChartHttpHandlerSettings..ctor(String parameters) +619 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.InitializeParameters() +237 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.EnsureInitialized(Boolean hardCheck) +208 System.Web.UI.DataVisualization.Charting.ChartHttpHandler.EnsureInstalled() +33 System.Web.UI.DataVisualization.Charting.Chart.GetImageStorageMode() +57 System.Web.UI.DataVisualization.Charting.Chart.Render(HtmlTextWriter writer) +257 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +144 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +583 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +91 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +410 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +118 System.Web.UI.HtmlControls.HtmlForm.RenderChildren(HtmlTextWriter writer) +489 System.Web.UI.HtmlControls.HtmlContainerControl.Render(HtmlTextWriter writer) +84 System.Web.UI.HtmlControls.HtmlForm.Render(HtmlTextWriter output) +713 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +144 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +583 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +91 System.Web.UI.HtmlControls.HtmlForm.RenderControl(HtmlTextWriter writer) +91 System.Web.UI.Control.RenderChildrenInternal(HtmlTextWriter writer, ICollection children) +410 System.Web.UI.Control.RenderChildren(HtmlTextWriter writer) +118 System.Web.UI.Control.Render(HtmlTextWriter writer) +60 System.Web.UI.Page.Render(HtmlTextWriter writer) +66 System.Web.UI.Control.RenderControlInternal(HtmlTextWriter writer, ControlAdapter adapter) +144 System.Web.UI.Control.RenderControl(HtmlTextWriter writer, ControlAdapter adapter) +583 System.Web.UI.Control.RenderControl(HtmlTextWriter writer) +91 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +7761 Can anyone tell me how to solve this problem... Should i have to create a temporary directory manually or what should i do...

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  • Sortable clone helper not working

    - by Jeremy Seekamp
    Maybe I don't understand how clone works with sortable, but here is what I would like to do. When sorting an item I would like a clone of the item I am dragging remain until I stop drop the item in its new position. Here's the code: <html> <head> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js"></script> <script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.2/jquery-ui.min.js"></script> <style type="text/css"> .sort { width: 150px; } .ui-state-highlight { background-color: #000; height:2px; } </style> </head> <body> <div> <ul class="sort"> <li>Item 1</li> <li>Item 2</li> <li>Item 3</li> <li>Item 4</li> </ul> </div> <script type="text/javascript"> $(function() { $('.sort').sortable({ helper: 'clone', placeholder: 'ui-state-highlight', opacity: '.5' }) }) </script> </body> </html> Thanks in advance for the help!

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  • how to clone the drag-event using jquery and jquery-ui.

    - by zjm1126
    i want to create a new '.b' div appendTo document.body, and it can dragable like its father, but i can not clone the drag event, how to do this, thanks this is my code : <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta name="viewport" content="width=device-width, user-scalable=no"> </head> <body> <style type="text/css" media="screen"> </style> <div id="map_canvas" style="width: 500px; height: 300px;background:blue;"></div> <div class=b style="width: 20px; height: 20px;background:red;position:absolute;left:700px;top:200px;"></div> <script src="jquery-1.4.2.js" type="text/javascript"></script> <script src="jquery-ui-1.8rc3.custom.min.js" type="text/javascript"></script> <script type="text/javascript" charset="utf-8"> $(".b").draggable({ start: function(event,ui) { //console.log(ui) //$(ui.helper).clone(true).appendTo($(document.body)) $(this).clone(true).appendTo($(document.body))//draggable is not be cloned, } }); $("#map_canvas").droppable({ drop: function(event,ui) { //console.log(ui.offset.left+' '+ui.offset.top) ui.draggable.remove(); } }); </script> </body> </html>

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  • jQuery Tabs remove icon

    - by mare
    Using jQuery Tabs script with an icon to remove the tab but this code renders differntly in IE8 and Firefox 3.6.2. The problem is that Firefox wraps the tab and puts "X" signs in new row, whicle IE correctly renders it in the same row (but not centered vertically as it should but rather in the top right corner - which is still better than Firefox behaviour). I have spent the last hour trying to find out if the problems lies in CSS (both with Firebug and IE's Developer Toolbar) but there is nothing special in CSS, just the default jQuery Flick UI CSS. <div id="tabgroup.<%= Model.Slug %>"> <ul> <% foreach (ContentListItem tab in Model.Contains) {%> <li><a href="#tab\.<%=tab.Slug%>"> <%=tab.Title%></a><% if (Context.User.IsInRole("Administrators")) { %><span class="ui-icon ui-icon-close"><%=Resources.Localize.Routes_TabDelete %></span><% } %> </li> <% }%> </ul> <% foreach (ContentListItem tab in Model.Contains) { Html.RenderAction("Display", "Tab", new { slug = tab.Slug }); }%> </div> Please disregard the stuff about ASP.NET MVC code...

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  • Design crowd sourcing

    - by CVertex
    I'm looking to get a logo designed, but all my designer friends/colleagues are pretty busy. Since I've never done it before, I thought it would be interesting to crowd source the design. Does anyone know of any good design crowd sourcing sites?

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  • Design Patters in Rails

    - by Winston
    I remember, I have a GoF book back in college about design patterns which helped me a lot with my C and C++ programming, since my jump ship to Rails I was trying to use those design patterns I learned previously, Rails is a relatively new paradigm to me, plurals, verbs, REST, DRY.. Can you give me a recommended book for Rails that I can easily understand what I previously learned back in College. P.S. I suspect Matz knew about the GoF book, and applied it on Ruby... :-)

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  • How to design shape class

    - by Tomek Tarczynski
    I want to design shape class. I need to distinguish several different shapes: -Point -Line -Triangle -Circle -Polygons The main purpose of this class is to calculate distance between two shapes. I've all methods for calculating those distances, but I want to have a single method that can be used, it should looks like this: float Distance(Shape a, Shape b) Simplest way to do it is to put a lot of if statements and then invoke proper method but this is deffinitely not OOP. How to design such class in OOP style?

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  • C# - Name the Design Pattern

    - by nettguy
    Using Fluent Interface design here if i call something like dog.Train("Running").Train("Eating").Do("Running").Do("Eating"); what is the name of this pattern ? is it chain-of-responsibility or there any specific design pattern name associated with it?

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  • Java design flaws that are unlikely to change due to backward compatibility

    - by koppernickus
    What are the Java language and standard library design flaws you are aware of? I ask only for flaws that: cannot be changed or are unlikely to change due to backward compatibility, are NOT controversial, i.e. most of programmers would agree that "this is a bug not a feature" (for example checked exceptions seem to be controversial language feature, so I wouldn't classify them as "design flaw").

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  • Simple database design and LINQ

    - by Anders Svensson
    I have very little experience designing databases, and now I want to create a very simple database that does the same thing I have previously had in xml. Here's the xml: <services> <service type="writing"> <small>125</small> <medium>100</medium> <large>60</large> <xlarge>30</xlarge> </service> <service type="analysis"> <small>56</small> <medium>104</medium> <large>200</large> <xlarge>250</xlarge> </service> </services> Now, I wanted to create the same thing in a SQL database, and started doing this ( hope this formats ok, but you'll get the gist, four columns and two rows): > ServiceType Small Medium Large > > Writing 125 100 60 > > Analysis 56 104 200 This didn't work too well, since I then wanted to use LINQ to select, say, the Large value for Writing (60). But I couldn't use LINQ for this (as far as I know) and use a variable for the size (see parameters in the method below). I could only do that if I had a column like "Size" where Small, Medium, and Large would be the values. But that doesn't feel right either, because then I would get several rows with ServiceType = Writing (3 in this case, one for each size), and the same for Analysis. And if I were to add more servicetypes I would have to do the same. Simply repetitive... Is there any smart way to do this using relationships or something? Using the second design above (although not good), I could use the following LINQ to select a value with parameters sent to the method: protected int GetHourRateDB(string serviceType, Size size) { CalculatorLinqDataContext context = new CalculatorLinqDataContext(); var data = (from calculatorData in context.CalculatorDatas where calculatorData.Service == serviceType && calculatorData.Size == size.ToString() select calculatorData).Single(); return data.Hours; } But if there is another better design, could you please also describe how to do the same selection using LINQ with that design? Please keep in mind that I am a rookie at database design, so please be as explicit and pedagogical as possible :-) Thanks! Anders

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