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• Silverlight Cream for January 08, 2011 -- #1023

  - by Dave Campbell

  In this Heavy and yet incomplete Issue: Mike Wolf, Walter Ferrari, Colin Eberhardt, Mathew Charles, Don Burnett, Senthil Kumar, cherylws, Rob Miles, Derik Whittaker, Thomas Martinsen(-2-), Jason Ginchereau, Vishal Nayan, and WindowsPhoneGeek. Above the Fold: Silverlight: "Automatically Showing ToolTips on a Trimmed TextBlock (Silverlight)" Colin Eberhardt WP7: "Windows Phone Blue Book Pdf" Rob Miles Sharepoint/Silverlight: "Discover Sharepoint with Silverlight - Part 1" Walter Ferrari Shoutouts: Dave Isbitski has announced a WP7 Firestarter, check for your local MS office: Announcing the “Light up your Silverlight Applications for Windows 7 Firestarter” From SilverlightCream.com: Leveraging Silverlight in the USA TODAY Windows 7-Based Slate App Mike Wolf has a post up about Cynergy's release of the new USA TODAY software for Windows 7 Slate devices, and gives a great rundown of all the resources, and how specific Silverlight features were used... tons of outstanding external links here! Discover Sharepoint with Silverlight - Part 1 Walter Ferrari has tutorial up at SilverlightShow... looks like the first in a series on Silverlight and Sharepoint... lots of low-level info about the internals and using them. Automatically Showing ToolTips on a Trimmed TextBlock (Silverlight) Colin Eberhardt has a really cool AutoTooltip attached behavior that gives a tooltip of the actual text if text is trimmed ... and has an active demo on the post... very cool. RIA Services Output Caching Mathew Charles digs into a RIA feature that hasn't gotten any blog love: output caching, describing all the ins and outs of improving the performance of your app using caching. Emailing your Files to Box.net Cloud Storage with WP7 Don Burnett details out everything you need to do to get Box.Net and your WP7 setup to talk to each other. Shortcuts keys for Developing on Windows Phone 7 Emulator Senthil Kumar has some good WP7 posts up ... this one is a cheatsheet list of Function-key assignements for the WP7 emulator... another sidebar listint Windows Phone 7 Design Guidelines – Cheat Sheet cherylws has a great Guideline list/Cheat Sheet up for reference while building a WP7 app... this is a great reference... I'm adding it to the Right-hand sidebar of WynApse.com Windows Phone Blue Book Pdf Rob Miles has added another book and color to his collection of both -- Windows Phone Programming in C#, also known as the Windows Phone Blue Book... get a copy from the links he gives, and check out his other free books as well. Navigating to an external URL using the HyperlinkButton Derik Whittaker has a post up discussing the woes (and error messages) of trying to navigate to an external URL with the Hyperlink button in WP7, plus his MVVM-friendly solution that you can download. Set Source on Image from code in Silverlight Thomas Martinsen has a couple posts up... first is this quick one on the code required to set an image source. Show UI element based on authentication Thomas Martinsen's latest is one on a BoolToVisibilityConverter allowing a boolean indicator of Authentication to be used to control the visibility of a button (in the sample) WP7 ReorderListBox improvements: rearrange animations and more Jason Ginchereau has updated his ReorderListBox from last week to add some animations (fading/sliding) during the rearrangement. Navigation in Silverlight Without Using Navigation Framework Vishal Nayan has a post that attracted my attention... Navigation by manipulating RootVisual content... I've been knee-deep in similar code in Prism this week (and why my blogging is off) ... Creating a WP7 Custom Control in 7 Steps WindowsPhoneGeek creates a simple custom control for WP7 before your very eyes in his latest post, focusing on the minimum requirements necessary for writing a Custom Control. Stay in the 'Light! Twitter SilverlightNews | Twitter WynApse | WynApse.com | Tagged Posts | SilverlightCream Join me @ SilverlightCream | Phoenix Silverlight User Group Technorati Tags: Silverlight    Silverlight 3    Silverlight 4    Windows Phone MIX10

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• Writing a method to 'transform' an immutable object: how should I approach this?

  - by Prog

  (While this question has to do with a concrete coding dilemma, it's mostly about what's the best way to design a function.) I'm writing a method that should take two Color objects, and gradually transform the first Color into the second one, creating an animation. The method will be in a utility class. My problem is that Color is an immutable object. That means that I can't do color.setRGB or color.setBlue inside a loop in the method. What I can do, is instantiate a new Color and return it from the method. But then I won't be able to gradually change the color. So I thought of three possible solutions: 1- The client code includes the method call inside a loop. For example: int duration = 1500; // duration of the animation in milliseconds int steps = 20; // how many 'cycles' the animation will take for(int i=0; i<steps; i++) color = transformColor(color, targetColor, duration, steps); And the method would look like this: Color transformColor(Color original, Color target, int duration, int steps){ int redDiff = target.getRed() - original.getRed(); int redAddition = redDiff / steps; int newRed = original.getRed() + redAddition; // same for green and blue .. Thread.sleep(duration / STEPS); // exception handling omitted return new Color(newRed, newGreen, newBlue); } The disadvantage of this approach is that the client code has to "do part of the method's job" and include a for loop. The method doesn't do it's work entirely on it's own, which I don't like. 2- Make a mutable Color subclass with methods such as setRed, and pass objects of this class into transformColor. Then it could look something like this: void transformColor(MutableColor original, Color target, int duration){ final int STEPS = 20; int redDiff = target.getRed() - original.getRed(); int redAddition = redDiff / steps; int newRed = original.getRed() + redAddition; // same for green and blue .. for(int i=0; i<STEPS; i++){ original.setRed(original.getRed() + redAddition); // same for green and blue .. Thread.sleep(duration / STEPS); // exception handling omitted } } Then the calling code would usually look something like this: // The method will usually transform colors of JComponents JComponent someComponent = ... ; // setting the Color in JComponent to be a MutableColor Color mutableColor = new MutableColor(someComponent.getForeground()); someComponent.setForeground(mutableColor); // later, transforming the Color in the JComponent transformColor((MutableColor)someComponent.getForeground(), new Color(200,100,150), 2000); The disadvantage is - the need to create a new class MutableColor, and also the need to do casting. 3- Pass into the method the actual mutable object that holds the color. Then the method could do object.setColor or similar every iteration of the loop. Two disadvantages: A- Not so elegant. Passing in the object that holds the color just to transform the color feels unnatural. B- While most of the time this method will be used to transform colors inside JComponent objects, other kinds of objects may have colors too. So the method would need to be overloaded to receive other types, or receive Objects and have instanceof checks inside.. Not optimal. Right now I think I like solution #2 the most, than solution #1 and solution #3 the least. However I'd like to hear your opinions and suggestions regarding this.

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• jQuery plugin for Event Driven Architecture?

  - by leeand00

  Are there any Event Driven Architecture jQuery plugins? Step 1: Subscribing The subscribers subscribe to the event handler in the middle, and pass in a callback method, as well as the name of the event they are listening for... i.e. The two green subscribers will be listening for p0 events. And the blue subscriber will be listening for p1 events. Step 2: The p0 event is fired by another component to the Event Handler A p0 event is fired to the Event Handler The event handler notifies it's subscribers of the event, calling the callback methods they specified when they subscribed in Step 1: Subscribing. Note that the blue subscriber is not notified because it was not listening for p0 events. Step 3: The p1 event is fired a component to the Event Handler The p1 event is fired by another component Just as before except that now the blue subscriber receives the event through its callback and the other two green subscribers do not receive the event. Images by leeand00, on Flickr I can't seem to find one, but my guess is that they just call it something else in Javascript/jquery Also is there a name for this pattern? Because it isn't just a basic publisher/subscriber, it has to be called something else I would think.

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• Double buffering with C# has negative effect

  - by Roland Illig

  I have written the following simple program, which draws lines on the screen every 100 milliseconds (triggered by timer1). I noticed that the drawing flickers a bit (that is, the window is not always completely blue, but some gray shines through). So my idea was to use double-buffering. But when I did that, it made things even worse. Now the screen was almost always gray, and only occasionally did the blue color come through (demonstrated by timer2, switching the DoubleBuffered property every 2000 milliseconds). What could be an explanation for this? using System; using System.Drawing; using System.Windows.Forms; namespace WindowsFormsApplication1 { public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Paint(object sender, PaintEventArgs e) { Graphics g = CreateGraphics(); Pen pen = new Pen(Color.Blue, 1.0f); Random rnd = new Random(); for (int i = 0; i < Height; i++) g.DrawLine(pen, 0, i, Width, i); } // every 100 ms private void timer1_Tick(object sender, EventArgs e) { Invalidate(); } // every 2000 ms private void timer2_Tick(object sender, EventArgs e) { DoubleBuffered = !DoubleBuffered; this.Text = DoubleBuffered ? "yes" : "no"; } } }

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• Missing WM_PAINT when hosting a WPF control inside a winforms application.

  - by Boris

  Hi All, Consider the following scenario: 1) Create a winforms application with an empty form. 2) Create a WPF usercontrol in the same project which is just the default control with background changed to blue. <UserControl x:Class="WindowsFormsApplication2.UserControl1" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" Height="300" Width="300" Background="Blue"> <Grid> </Grid> </UserControl> 3) Build the project 4) Add the control to your form (an ElementHost is added and the control is added inside it). 5) Run the application (everything looks nice) 6) Start Spy++, click find window (Control+F) and move the cursor onto the WPF control (the blue square) Something strange happens, the control gets a WM_ERASEBKGND message but no WM_PAINT message so now it is white. You can resize the form, hide the form behind other windows and the WPF control will not get rendered. There is an image of the scenario here: http://img260.imageshack.us/img260/2296/wmpaint.png This is a simplified example of the situation I have in the actual application. Please tell me what is the best way to resolve this issue such that the WPF control renders itself correctly. I would like a solution that can be incorporated into a large application with many controls on the form. Thank you very much in advance, Boris

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• How do I display grouped XML data in a Flex pie chart?

  - by mclaughlinj

  I've looked into grouping XML data with GroupingCollections and AdvancedDataGrids, but I can't figure out how to display that data in a chart. Basically, what I want to do is group the data by the category field, which should give me two rows under red, one under blue, and one under green. When inputting this data into the pie chart, it should take up the right amount of space (1/2 for red, 1/4 each for blue and green). I don't need the other_data field, as I'd like to use the group name (category in this case) as the callout. Any suggestions? Sample data: <row> <category>red</category> <other_data>this shouldn't really matter</other_data> </row> <row> <category>blue</category> <other_data>this shouldn't really matter</other_data> </row> <row> <category>red</category> <other_data>this shouldn't really matter</other_data> </row> <row> <category>green</category> <other_data>this shouldn't really matter</other_data> </row>

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• a selector which has this selector together with a class selector

  - by Woho87

  Here is an analogy of my problem(a selector which has this selector together with a class selector): Let say that I selects all yellow(classes) div elements in a arbitrary HTML document. And I want each to check if the attribute is yes = 1. If the attribute 'yes' equals '1', then I want the child with class 'blue' have the attribute 'no' equals '1'; $('div .yellow').each(function(){ if($(this).attr('yes') == 1){ $(this '.blue:first-child').attr('no', 1);//This line needs to be fixed } }); I know that the line this.getElementsByClassName('blue')[0] fixes this problem. But in my real problem (not this analogy) I want to use addClass and removeClass which only functions with jQuery objects. It is to cumbersome to use other functions than addClass and removeClass. UPDATE: Here is a code snippet from my real problem. I got some problem with "this" in javascript. I want a invited button to have the className visible when I click on it. The button lies within a div element with className 'box'. I know that there are problem with 'this' on the code snippet. But I want the button and not the box to change to visible $('.Box').each(function(){ if($(this).attr('hasButton') != 1){ var invite = document.createElement('div'); invite.className = 'invite invisible'; invite.innerHTML = 'invite'; $(this).attr('hasButton', 1); this.appendChild(invite); invite.addEventListener('mouseover', function(event){ $('.invite', this).removeClass('invisible');//this line is not functioning $('.invite', this).addClass('visible');//neither this }, false); } });

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• Windows Form color changing

  - by Sef

  Hello, So i am attempting to make a MasterMind program as sort of exercise. Field of 40 picture boxes (line of 4, 10 rows) 6 buttons (red, green, orange, yellow, blue, purple) When i press one of these buttons (lets assume the red one) then a picture box turns red. My question is how do i iterate trough all these picture boxes? I can get it to work but only if i write : And this is offcourse no way to write this, would take me countless of lines that contain basicly the same. private void picRood_Click(object sender, EventArgs e) { UpdateDisplay(); pb1.BackColor = System.Drawing.Color.Red; } Press the red button - first picture box turns red Press the blue button - second picture box turns blue Press the orange button - third picture box turns orange And so on... Ive had a previous similar program that simulates a traffic light, there i could assign a value to each color (red 0, orange 1, green 2). Is something similar needed or how exactly do i adress all those picture boxes and make them correspond to the proper button. Best Regards.

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• Custom UITableviewcell, CGGradient still shows when cell is selected?

  - by Burnsoft Ltd

  I'm using a custom tableview cell (like Tweetie's fast scrolling) i've added a gradient to the context, which looks really nice, but when I select the cell, the gradient is still visible. I'm not sure how to go about removing the gradient when the cell is selected? any ideas? cheers Nik - (void)drawContentView:(CGRect)r { CGContextRef context = UIGraphicsGetCurrentContext(); UIColor *backgroundColor = [UIColor whiteColor]; UIColor *textColor = [UIColor blackColor]; UIColor *dateColor = [UIColor colorWithRed:77.f/255.f green:103.f/255.f blue:155.f/255.f alpha:1]; if(self.selected) { backgroundColor = [UIColor clearColor]; textColor = [UIColor whiteColor]; } [backgroundColor set]; CGContextFillRect(context, r); //add gradient CGGradientRef myGradient; CGColorSpaceRef myColorspace; size_t num_locations = 2; CGFloat locations[2] = {0.0, 1.0}; CGFloat components[8] = {0.9f, 0.9f, 0.9f, 0.7f, // Bottom Colour: Red, Green, Blue, Alpha. 1.0f, 1.0f, 1.0f, 1.0}; // Top Colour: Red, Green, Blue, Alpha. myColorspace = CGColorSpaceCreateDeviceRGB(); myGradient = CGGradientCreateWithColorComponents (myColorspace, components, locations, num_locations); CGColorSpaceRelease(myColorspace); CGPoint startPoint, endPoint; startPoint.x = 0; startPoint.y = self.frame.size.height; endPoint.x = 0; endPoint.y = self.frame.size.height-15; // just keep the gradient static size, never mind how big the cell is CGContextDrawLinearGradient (context, myGradient, startPoint, endPoint, 0); CGGradientRelease(myGradient); //gradient end //rest of custom drawing goes here.... } Should I be doing something in the if cell selected code?

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• CSS - Which method is better?

  - by Joe

  Which is better in regards to processing time but also taking into account ease of use for a developer? .font_small{ font-size:10px; } .font_blue{ color:blue; } .font_red{ color:red; } <span class="font_small font_blue">Hello World!</span><br /> <span class="font_small font_red">Today's the day!</span> OR .font_blue_small{ color:blue; } .font_red_small{ color:red; } .font_blue_small .font_red_small { font-size:10px; } <span class="font_blue_small">Hello World!</span><br /> <span class="font_red_small">Today's the day!</span> OR .font_blue_small{ color:blue; font-size:10px; } .font_red_small{ color:red; font-size:10px; } <span class="font_blue_small">Hello World!</span><br /> <span class="font_red_small">Today's the day!</span> OR Another option I haven't though of yet...?

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• Why do my raytraced spheres have dark lines when lit with multiple light sources?

  - by Curyous

  I have a simple raytracer that only works back up to the first intersection. The scene looks OK with two different light sources, but when both lights are in the scene, there are dark shadows where the lit area from one ends, even if in the middle of a lit area from the other light source (particularly noticeable on the green ball). The transition from the 'area lit by both light sources' to the 'area lit by just one light source' seems to be slightly darker than the 'area lit by just one light source'. The code where I'm adding the lighting effects is: // trace lights for ( int l=0; l<primitives.count; l++) { Primitive* p = [primitives objectAtIndex:l]; if (p.light) { Sphere * lightSource = (Sphere *)p; // calculate diffuse shading Vector3 *light = [[Vector3 alloc] init]; light.x = lightSource.centre.x - intersectionPoint.x; light.y = lightSource.centre.y - intersectionPoint.y; light.z = lightSource.centre.z - intersectionPoint.z; [light normalize]; Vector3 * normal = [[primitiveThatWasHit getNormalAt:intersectionPoint] retain]; if (primitiveThatWasHit.material.diffuse > 0) { float illumination = DOT(normal, light); if (illumination > 0) { float diff = illumination * primitiveThatWasHit.material.diffuse; // add diffuse component to ray color colour.red += diff * primitiveThatWasHit.material.colour.red * lightSource.material.colour.red; colour.blue += diff * primitiveThatWasHit.material.colour.blue * lightSource.material.colour.blue; colour.green += diff * primitiveThatWasHit.material.colour.green * lightSource.material.colour.green; } } [normal release]; [light release]; } } How can I make it look right?

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• Explain this C# code: byte* p = (byte*) (void*) Scan0;

  - by qulzam

  I found the code from the net in which i cant understand this line:- byte* p = (byte*)(void*)Scan0; There Scan0 is System.IntPtr. It is code of C#.Net. Plz Explain the above line. The complete code is given below. this is code to convert a image in grayscale. public static Image GrayScale(Bitmap b) { BitmapData bmData = b.LockBits(new Rectangle(0, 0, b.Width, b.Height), ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); int stride = bmData.Stride; System.IntPtr Scan0 = bmData.Scan0; unsafe { byte* p = (byte*)(void*)Scan0; int nOffset = stride - b.Width * 3; byte red, green, blue; for (int y = 0; y < b.Height; ++y) { for (int x = 0; x < b.Width; ++x) { blue = p[0]; green = p[1]; red = p[2]; p[0] = p[1] = p[2] = (byte)(.299 * red + .587 * green + .114 * blue); p += 3; } p += nOffset; } } b.UnlockBits(bmData); return (Image)b; } I understand all the code but only have the problem on this line. byte* p = (byte*)(void*)Scan0;

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• Fluently setting C# properties and chaining methods

  - by John Feminella

  I'm using .NET 3.5. We have some complex third-party classes which are automatically generated and out of my control, but which we must work with for testing purposes. I see my team doing a lot of deeply-nested property getting/setting in our test code, and it's getting pretty cumbersome. To remedy the problem, I'd like to make a fluent interface for setting properties on the various objects in the hierarchical tree. There are a large number of properties and classes in this third-party library, and it would be too tedious to map everything manually. My initial thought was to just use object initializers. Red, Blue, and Green are properties, and Mix() is a method that sets a fourth property Color to the closest RGB-safe color with that mixed color. Paints must be homogenized with Stir() before they can be used. Bucket b = new Bucket() { Paint = new Paint() { Red = 0.4; Blue = 0.2; Green = 0.1; } }; That works to initialize the Paint, but I need to chain Mix() and other methods to it. Next attempt: Create<Bucket>(Create<Paint>() .SetRed(0.4) .SetBlue(0.2) .SetGreen(0.1) .Mix().Stir() ) But that doesn't scale well, because I'd have to define a method for each property I want to set, and there are hundreds of different properties in all the classes. Also, C# doesn't have a way to dynamically define methods prior to C# 4, so I don't think I can hook into things to do this automatically in some way. Third attempt: Create<Bucket>(Create<Paint>().Set(p => { p.Red = 0.4; p.Blue = 0.2; p.Green = 0.1; }).Mix().Stir() ) That doesn't look too bad, and seems like it'd be feasible. Is this an advisable approach? Is it possible to write a Set method that works this way? Or should I be pursuing an alternate strategy?

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• BeautifulSoup: just get inside of a tag, no matter how many enclosing tags there are

  - by AP257

  I'm trying to scrape all the inner html from the <p> elements in a web page using BeautifulSoup. There are internal tags, but I don't care, I just want to get the internal text. For example, for: <p>Red</p> <p><i>Blue</i></p> <p>Yellow</p> <p>Light <b>green</b></p> How can I extract: Red Blue Yellow Light green Neither .string nor .contents[0] does what I need. Nor does .extract(), because I don't want to have to specify the internal tags in advance - I want to deal with any that may occur. Is there a 'just get the visible HTML' type of method in BeautifulSoup? ----UPDATE------ On advice, trying: p_tags = page.findAll('p',text=True) for i, p_tag in enumerate(p_tags): print str(p_tag) But that doesn't help - it just prints out: Red <i>Blue</i> Yellow Light <b>green</b>

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• d3: Coloring Multiple Lines from Nested Data

  - by diet_coke

  I'm currently assembling some line graphs with circles at the datapoints from arrays of JSON objects formatted like so: var data = [{ "name": "metric1", "datapoints": [ [10.0, 1333519140], [48.0, 1333519200] ] }, { "name": "metric2", "datapoints": [ [48.0, 1333519200], [12.0, 1333519260] ] }] I want to have a color for each metric, so I'm trying to color them based on the index of the object within the array data. The code I have currently for just placing the circles looks like: // We bind an svg group to each metric. var metric_groups = this.vis.selectAll("g.metric_group") .data(data).enter() .append("g") .attr("class", "metric_group"); // Then bind a circle for each datapoint. var circles = metric_groups.selectAll("circle") .data(function(d) { return d.datapoints; }); circles.enter().append("circle") .attr("r", 3.5); Now if I change that last bit to something like: circles.enter().append("circle") .attr("r", 3.5); .style("fill", function(d,i) { return i%2 ? "red" : "blue"; } I get alternating red and blue circles, as could be expected. Taking some advice from Nested Selections : 'Nesting and Index', I tried: circles.enter().append("circle") .attr("r", 3.5); .style("fill", function(d,i,j) { return j%2 ? "red" : "blue"; } Which doesn't work (j is undefined), presumably because we are in the named property datapoints, rather than an array element. How might I go about doing the coloring that I want without changing my data structure? Thanks!

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• Simple css class selector issue

  - by FlyingCat

  I am having a problem with a simple first of type css issue I have <div class='test'> <div>test 1</div> <div>test 2</div> </div> <div class='test'> <div>test 3</div> <div>test 4</div> </div> <div class='test'> <div>test 5</div> <div>test 6</div> </div> I want the first test div showing background red and the rest are blue. I have .test{ background-color: blue; margin: 15px; border-top: dashed 1px grey; } .test:first-of-type{ background-color: red; border-top:0; } but all my divs are showing blue. Am I doing something wrong here? Thanks for the help!

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• How can I concisely copy multiple SQL rows, with minor modifications?

  - by Steve Jessop

  I'm copying a subset of some data, so that the copy will be independently modifiable in future. One of my SQL statements looks something like this (I've changed table and column names): INSERT Product( ProductRangeID, Name, Weight, Price, Color, And, So, On ) SELECT @newrangeid AS ProductRangeID, Name, Weight, Price, Color, And, So, On FROM Product WHERE ProductRangeID = @oldrangeid and Color = 'Blue' That is, we're launching a new product range which initially just consists of all the blue items in some specified current range, under new SKUs. In future we may change the "blue-range" versions of the products independently of the old ones. I'm pretty new at SQL: is there something clever I should do to avoid listing all those columns, or at least avoid listing them twice? I can live with the current code, but I'd rather not have to come back and modify it if new columns are added to Product. In its current form it would just silently fail to copy the new column if I forget to do that, which should show up in testing but isn't great. I am copying every column except for the ProductRangeID (which I modify), the ProductID (incrementing primary key) and two DateCreated and timestamp columns (which take their auto-generated values for the new row). Btw, I suspect I should probably have a separate join table between ProductID and ProductRangeID. I didn't define the tables. This is in a T-SQL stored procedure on SQL Server 2008, if that makes any difference.

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• Active State Image Display

  - by fmz

  I have some images that need to change, based not only on hover, but also on active state. If you look at the page here: http://site427.mysite4now.net/tazthedog/site1/ There are some tabs with Screen Printing Quick Links, etc. The tab image is associated with the link and displays properly. The icon in tabs defaults to the gray and turns blue on mouse over, however, I also need it to be blue on the "active" state. Here is the css: .quick-links em:hover { background: transparent url(../images/quick-links.png) 10px 9px no-repeat ; display: block ; float: left; } Here is the html: <ul class="tabs"> <li class="quick-links"> <a href="#quickLinks" id=""> <em> <span>Screen Printing Quick Links</span> </em> </a> </li> <li class="distributor-ql"> <a href="#distributorQL" id=""> <em> <span>Dealer &amp; Distributor Quick Links</span> </em> </a> </li> </ul> I tried adding a .quick-links em:active... but that doesn't maintain it. I know there is a way to keep the icon blue while in the active state, I just need a little help to understand what that is. Thanks!

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• JavaScript doesn't parse when mod-rewrited through a PHP file?

  - by Newbtophp

  If I do the following (this is the actual/direct path to the JavaScript file): <script href="http://localhost/tpl/blue/js/functions.js" type="text/javascript"></script> It works fine, and the JavaScript parses - as its meant too. However I'm wanting to shorten the path to the JavaScript file (aswell as do some caching) which is why I'm rewriting all JavaScript files via .htaccess to cache.php (which handles the caching). The .htaccess contains the following: <IfModule mod_rewrite.c> RewriteEngine On RewriteBase / RewriteRule ^js/(.+?\.js)$ cache.php?file=$1 [NC] </IfModule> cache.php contains the following PHP code: <?php if (extension_loaded('zlib')) { ob_start('ob_gzhandler'); } $file = basename($_GET['file']); if (file_exists("tpl/blue/js/".$file)) { header("Content-Type: application/javascript"); header('Cache-Control: must-revalidate'); header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 3600) . ' GMT'); echo file_get_contents("tpl/blue/js/".$file); } ?> and I'm calling the JavaScript file like so: <script href="http://localhost/js/functions.js" type="text/javascript"></script> But doing that the JavaScript doesn't parse? (if I call the functions which are within functions.js later on in the page they don't work) - so theirs a problem either with cache.php or the rewrite rule? (because the file by itself works fine). If I access the rewrited file- http://localhost/js/functions.js directly it prints the JavaScript code, as any JavaScript file would - so I'm confused as to what I'm doing wrong... All help is appreciated! :)

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• Alternate colors on click with jQuery

  - by Jace Cotton

  I'm sure there is a simple solution to this, and I'm sure this is a duplicate question, though I have been unable to solve my solution particularly because I don't really know how to phrase it in order to search for other questions/solutions, so I'm coming here hoping for some help. Basically, I have spans with classes that assigns a background-color property, and inside those spans are words. I have three of these spans, and each time a user clicks on a span I want the class to change (thus changing the background color and inner text). HTML: <span class="alternate"> <span class="blue showing">Lorem</span> <span class="green">Ipsum</span> <span class="red">Dolor</span> </span> CSS: .alternate span { display : none } .alternate .showing { display : inline } .blue { background : blue } .green { background : green } .red { background : red } jQuery: $(".alternate span").each(function() { $(this).on("click", function() { $(this).removeClass("showing"); $(this).next().addClass("showing"); }); }); This solution works great using $.next until I get to the third click, whereafter .showing is removed, and is not added since there are no more $.next options. How do I, after getting to the last-child, add .showing to the first-child and then start over? I have tried various options including if($(".alternate span:last-child").hasClass("showing")) { etc. etc. }, and I attempted to use an array and for loop though I failed to make it work. Newb question, I know, but I can't seem to solve this so as a last resort I'm coming here.

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• Is there a concise way to map a string to an enum in Objective-C?

  - by zekel

  I have a string I want to parse and return an equivalent enum. I need to use the enum type elsewhere, and I think I like how I'm defining the class. The problem is that I don't know a good way to check the string against the enum values without being redundant about the order of the enums. typedef enum { ZZColorRed, ZZColorGreen, ZZColorBlue, } ZZColorType; - (ZZColorType)parseColor:(NSString *)inputString { // inputString will be @"red", @"green", or @"blue" (trust me) // how can I turn that into ZZColorRed, etc. without // redefining their order like this? NSArray *colors = [NSArray arrayWithObjects:@"red", @"green", @"blue", nil]; return [colors indexOfObject:inputString]; } In Python, I'd probably do something like the following, although to be honest I'm not in love with that either. ## maps url text -> constant string RED_CONSTANT = 1 BLUE_CONSTANT = 2 GREEN_CONSTANT = 3 TYPES = { 'red': RED_CONSTANT, 'green': GREEN_CONSTANT, 'blue': BLUE_CONSTANT, } def parseColor(inputString): return TYPES.get(inputString) ps. I know there are color constants in Cocoa, this is just an example.

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• Getting started with MIT Proto

  - by Charles

  MIT Proto lacks a basic getting started guide. How do I find a shell that accepts commands like (def foo...) and proto -n 1000 -l -m ...? http://groups.csail.mit.edu/stpg/proto.html I can run in my bash shell: ./proto -n 1000 -s 0.1 -T -l "(red (gradient (= (mid) 0)))" I can't figure out how to run e.g. channel.proto: (def channel (src dst width) (let* ((d (distance src dst)) (trail (<= (+ (gradient src) (gradient dst)) (+ d 0.01))) ;; float error ;; (trail (= (+ (gradient src) (gradient dst)) d)) ) (dilate trail width))) ;; To see a channel calculated from geometric primitives, run: ;; proto -n 1000 -l -m -s 0.5 "(blue (channel (sense 1) (sense 2) 10))" ;; click on a device and hit 't' to set up the source, then click on ;; another device and hit 'y' to designate the destination. At first ;; every device will be blue, but then it should clear and you should ;; see a thick blue path connecting the two devices you selected. Thanks! P.S. Somebody please tag this mit-proto. I can't.

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• All X elements below Y, but before another, descendent, Y

  - by JPM

  <div n="a"> . . . . . . <spec>red</spec> <spec>green</spec> . . . <div n="b"> . . . <spec>blue</spec> . . . </div> <div n="c"> <spec>yellow</spec> </div> . . . . . . . . . </div> When the current element is <div n="a">, I need an XPATH expression that returns the red and green elements, but not the blue and yellow ones, as .//spec does. When the current element is <div n="b">, the same expression needs to return the blue element; when <div n="c">, the yellow element. Something like .//spec[but no further than another div if there is one]

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• Canvas draw calls are rendering out of sequence

  - by Tom Murray

  I have the following code for writing draw calls to a "back buffer" canvas, then placing those in a main canvas using drawImage. This is for optimization purposes and to ensure all images get placed in sequence. Before placing the buffer canvas on top of the main one, I'm using fillRect to create a dark-blue background on the main canvas. However, the blue background is rendering after the sprites. This is unexpected, as I am making its fillRect call first. Here is my code: render: function() { this.buffer.clearRect(0,0,this.w,this.h); this.context.fillStyle = "#000044"; this.context.fillRect(0,0,this.w,this.h); for (var i in this.renderQueue) { for (var ii = 0; ii < this.renderQueue[i].length; ii++) { sprite = this.renderQueue[i][ii]; // Draw it! this.buffer.fillStyle = "green"; this.buffer.fillRect(sprite.x, sprite.y, sprite.w, sprite.h); } } this.context.drawImage(this.bufferCanvas,0,0); } This also happens when I use fillRect on the buffer canvas, instead of the main one. Changing the globalCompositeOperation between 'source-over' and 'destination-over' (for both contexts) does nothing to change this. Paradoxically, if I instead place the blue fillRect inside the nested for loops with the other draw calls, it works as expected... Thanks in advance!

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• Advance Query with Join

  - by user1462589

  I'm trying to convert a product table that contains all the detail of the product into separate tables in SQL. I've got everything done except for duplicated descriptor details. The problem I am having all the products have size/color/style/other that many other products contain. I want to only have one size or color descriptor for all the items and reuse the "ID" for all the product which I believe is a Parent key to the Product ID which is a ...Foreign Key. The only problem is that every descriptor would have multiple Foreign Keys assigned to it. So I was thinking on the fly just have it skip figuring out a Foreign Parent key for each descriptor and just check to see if that descriptor exist and if it does use its Key for the descriptor. Data Table PI Colo Sz OTHER 1 | Blue | 5 | Vintage 2 | Blue | 6 | Vintage 3 | Blac | 5 | Simple 4 | Blac | 6 | Simple =================================== Its destination table is this =================================== DI Description 1 | Blue 2 | Blac 3 | 5 4 | 6 6 | Vintage 7 | Simple ============================= Select Data.Table Unique.Data.Table.Colo Unique.Data.Table.Sz Unique.Data.Table.Other ======================================= Then the dual part of the questions after we create all the descriptors how to do a new query and assign the product ID to the descriptors. PI| DI 1 | 1 1 | 3 1 | 4 2 | 1 2 | 3 2 | 4 By figuring out how to do this I should be able to duplicate this pattern for all 300 + columns in the product. Some of these fields are 60+ characters large so its going to save a ton of space. Do I use a Array?

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