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Here is the updated source code for the PostItBoard WPF example app so that it compiles and runs on the latest NET 3.0 / WPF RC1. Or if you are only inerested in the binaries you can grab those too. In addition, apologies to everyone who asked me about the source code for the flickr assemblies that were missing from the previous release. This release has all the source code and projects.

Please drop me a line if you have any problems running this WPF example application.

Note: I get quite a few emails asking me if the image above is an actual screenshot of the application or if it was photoshopped. The image was in no way photoshopped. It is the application as it appears at runtime.

Cheers!

Michael G. Emmons

Click the image to run the WPF ScrollingCanvas example xbap or you can get the source code for it. This example creates a custom user control based on the Canvas container. This ScrollingCanvas allows you to scroll any FrameworkElement: text, video, shapes, or even whole scenes. Moreover, you can scroll multiple FrameworkElement objects at the same time in a single scroll container.Both speed and direction of the scroll is controllable via dependency properties. Simply drop the ScrollingCanvas control on the design surface or add it in XAML, add any FrameworkElements you want to scroll to the ScrollingCanvas container and call the ScrollBegin() method. All object scrolling is handled through local animations in the C# codebehind.

Greetings from Italy! I’m still on vacation enjoying Rome, so no new examples from me. However, Kevin Moore left a note indicating that the KevinButton source code, which my SmileyButton was based on, is now available from Kevin’s  Bag-o-Tricks RC1. It has a lot of cool stuff besides the KevinButton, so check it out! Head on over to Kevin’s Blog and peruse some screen shots of it.

 -MGE

Programmatically scrolling to a particular item in a ListView has become absurdly easy in WPF. However, it seems that this is not a well-known feature. I've had a number of people ask me about how to do this and if you google on "wpf ScrollIntoView" you will find almost nothing. All you need to do is get a reference to the item you are trying to scroll to and call the ScrollIntoView method, like so:

Easy, eh? To demonstrate the functionality, I've included this cheezy XBAP example...

Apologies for the lack of recent posts. Things have been hectic with a wedding (not mine) in Hawaii recently and preparing for a trip to Italy next week. Have no fear, though--there are lots of interesting things coming up!

 -Michael G. Emmons

Here are the project files for the SmileyButton WPF example. Enjoy!

 If you have any problems with this or any of my other WPF examples, drop me a line.

-Michael G. Emmons

I have been made aware that the xbap examples are not being served up correctly. I am looking into this and should have it resolved soon.

[UPDATE] It seems that the MIME types required to serve the XBAP did not register right away, even though they were added to the configuration files. Everything should work correctly now.

If anyone has any other issues please let me know.

-MGE

Here is the XAML source code for the SmileyButton control templating xbap example which I showed in my previous post.

A few weeks ago there was a good humored Channel 9 video named "Reskin Your Application with the KevinButton". While the video is lighthearted, it makes a very important point: Control templates are one of the most powerful and important reasons why we should all look at WPF as our future development platform. I've had discussions with many people who are just starting to look seriously at WPF. Their initial response to the new platform is very similar and can be summed up by, "WPF has some cool features and nice eye-candy, but I don't find it particularly ground-breaking." Invariably these same people completely reconsider their initial impressions once they "get" what control templates are all about.

To get an understanding of exactly why control templates are so powerful you need to know that, with a very few exceptions, in WPF controls do not own their presentation. The presentation of a control is almost completely separated from the business logic of that control. By using a control template the presentation can be overridden to be almost anything.

In the Channel 9 video, Kevin Moore and Robby Ingebretsen create a new button template that animates a button using a grid, some rectangles and a few images. Check out the video. I was unable to find the source code for their example so I quickly created a similar SmileyButton xbap example for everyone to peruse. Just click on the picture below to run the xbap app. This does exactly the same thing as the KevinButton, but using different images. The smiley will animate according to which part of the button the mouse is over. This has been built using the July CTP.

If you haven't had a chance to watch the video, the important thing to note about this example is that the single control in the application is a button: it captures and hooks into all the events and methods that a standard button inherits. It just has its presentation changed to be something other than the default.

The xaml source code for this WPF example can be found in the next post.

I still see lots of questions on how to make a main application window transparent or semi-transparent. This was a bit involved in versions of WPF previous to the June CTP and was not very practical because it could not be rendered in hardware. But functionality added to WPF since has made it easy to accomplish and it supports hardware rendering when available. All you need to do is to base your main scene on the Window class and add the following code to the constructor:

this.WindowStyle = WindowStyle.None;
this.AllowsTransparency = true;
this.Background = new SolidColorBrush(System.Windows.Media.Color.FromArgb(0, 34, 34, 34));

Note that the amount of transparency, or more correctly, opaqueness, is set by the alpha channel which is the first number in the FromArgb method. Setting the alpha channel to 1.0 would be 100% opaque. 0 is 0% opaque and .5 is 50% opaque.

-MGE