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• Clipping of child elements

  On the forums I saw this interesting problem where there was a need to round the corners of a stackpanel inside a border with cornerradius set... The top is what you get and the bottom image is what you want. The simplest thing to do here is to set the padding on the border so that the stackpanel doesnt bleed around the corners. But when that doesnt meet your requirements you will need to set the clip property on the child in the OnRender function so that you get the correct clipping. The code for the above is attached .(thanks to Ifeanyi) Share this post Read More... Posted Monday, April 07, 2008 11:18 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, WPF samples, .net 3.5

• Split Button\Menu Item\Automation

  I got a couple of queries from the readers asking if I could provide a slightly non-trivial sample of using automation. So I created a split button user control which looks something like this If there are no items then you get a checkable button. The items are created in a popup and are generated on demand. This makes the automation a bit interesting. As you can see the control supports 3 patterns – · Invoke (for the button) · ExpandCollapse (for the drop down) · Toggle (for the checkable option) – This is just for demo purposes You will need to specify this in the GetPattern function which overrides the one in the base AutomationPeer. The other function that you might want to override is GetChildrenCore in case of popups. The default behavior is to go through the visual tree and get the children. However, popups are in a separate visual tree. The sample overrides the function since the items are displayed as part of a popup J Also for each of the patterns, it is necessary that we implement Read More... Posted Tuesday, March 25, 2008 12:42 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, .NET 3.0, WPF samples, .net 3.5

• Xbaps using Cookies

  Earlier on I had written an app, BlogPadm which was fulltrust and the writer used Google Data API to write the content to Blogger.com. However, when you create an xbap version of it, a problem arises in that you cannot make WebRequests outside site of origin and hence, the xbap version of the above failed to take off. The workaround is to create a webservice at the site of origin so that the calls are forwarded. However, the focus of this app was to test cookies. So I hosted a blog server and had the blogwriter at the site of origin. So the flow is something like this: http://MainSite/Login.aspx à http://blogsite/blogwriter.xbap à http://blogsite/postentry.aspx The communication between the asp pages and the xbap is through cookies. Code for this application is attached. Note that this project makes use of servers and hence, the app won’t run on execution since the server code is now on the local machine. The Blog engine used is the BlogEngine.net which is an open source blog server. The Read More... Posted Monday, March 10, 2008 2:32 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, .NET 3.0, WPF samples, .net 3.5

• Another MindMapping Tool

  A month ago, I was browsing through different blogs and came across Denis Vuyka's blog post on connecting objects on the canvas... Nice post... Being an avid fan of mind maps, that was the natural extension to the library that he created. Check it out There are 3 types of objects which are basically the same... they contain rich content... Right clicking on the objects opens up an editable Richtextbox... In case you paste in Links, you can click them (Ctrl + Click) ... This opens the link in a new browser window. Maps can be saved/opened. Notice that saving a file also creates a folder with multiple streams. Ideally, everything would be zipped into a single file., I have left this upto you guys :) ... The reason for these multiple streams is the presence of images in Richtextboxes. A simple XamlWriter.Save saves only the image links and not the image. As such, the richtextboxes are saved in the xamlpackage format and picked up on opening the file.... Source code is attached so that you Read More... Posted Thursday, January 24, 2008 11:47 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, .NET 3.0, WPF samples, .net 3.5

• MindMap app using Hyperbolic tree

  I recently came across a Hyperbolic tree implementation on codeplex using WPF and thought that a nice usage of it could be in writing a mind map creating application.... I tweaked some of the original code and got a tree with editable nodes... Its been laying around for sometime, so I thought it best to put it out there so that you folks can continue its development. Though its not functional in the true sense, it does provide the basic functionality like saving and opening (albeit to the same file)... Currently only the text is serialized... The project (VS 2008) is attached Note that the usage of the Hyperbolic tree and its code is under the Codeplex License terms Share this post Read More... Posted Wednesday, October 31, 2007 11:25 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Microsoft, .NET 3.0, WPF samples, Windows Presentation Foundation, .net 3.5

• 3.5 features: Viewport2DVisual3D

  Viewport2DVisual3D .... this new feature makes things a lot easier in the 3D world.. What this enables is putting interactive 2D on 3D. This makes things like having a textbox in 3D a breeze... < Viewport2DVisual3D x:Name = " vp2d_multiple_children " Geometry = " {StaticResource mesh} " > < Viewport2DVisual3D.Material > < DiffuseMaterial Viewport2DVisual3D.IsVisualHostMaterial = " True " Brush = " White " /> </ Viewport2DVisual3D.Material > <TextBox /> </ Viewport2DVisual3D > One other thing is mapping 3D points to 2D is so much more easier... Earlier on I had a post on mapping a mouseclick on a 3d model to a 2d coordinate. This involved using some barycentric coordinates and such... Now all you need is call e.GetPosition(relativeTo) in the mouse event handler... tada!!... your coordinates are ready... so using this new stuff i created a simple app for keeping track of your travels. right clicking on the globe puts a tag on the globe. Clicking on the Read More... Posted Thursday, August 30, 2007 11:09 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, Microsoft, .NET 3.0, WPF samples, Windows Presentation Foundation, .net 3.5

• 3.5 Features: Enabled hyperlinks in RichTextBox

  hmmm... that was one often requested feature. So to enable hyperlinks in RichTextBox all that is needed is to set the property IsDocumentEnabled on the RichTextBox. Type the following in XamlPadX and you have the hyperlink navigation working. < RichTextBox IsDocumentEnabled = " True " xmlns = ' http://schemas.microsoft.com/winfx/2006/xaml/presentation ' xmlns:x = ' http://schemas.microsoft.com/winfx/2006/xaml ' > < FlowDocument > < Paragraph > < Hyperlink NavigateUri = " http://club.live.com " > Live Games </ Hyperlink > </ Paragraph > </ FlowDocument > </ RichTextBox > A couple of things to notice here: 1> The Navigation is possible only on a Ctrl Click operation 2> There is no tooltip to indicate that navigation is possible. You could add this to the Hyperlink. A simpler alternative is to just subclass the Hyperlink and add the tooltip in the constructor public class MyHyperlink : Hyperlink { public MyHyperlink() { this .ToolTip = Read More... Posted Thursday, August 09, 2007 11:43 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Microsoft, .NET 3.0, WPF samples, Windows Presentation Foundation, .net 3.5

• WPF Balloon comments :)

  Pavan has a nice post on creating baloon comments. The first thing that comes to mind on seeing the balloon comments is Comics. And guess what! thats exactly what I tried.. and presto You can get the original source code here . It overlooks positioning the arrows coming out of the comment boxes - this is a minor detail and I added a dependency property for this purpose. The update code is attached . As for the usage: < custom:BalloonDecorator Background = "Pink " PointerLength = " 30 " CornerRadius = " 5 " CornerPosition = " Right" .... /> Share this post Read More... Posted Wednesday, July 11, 2007 11:03 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Windows Presentation Foundation

• WpfPerf tools now available as a msi

  A couple of weeks ago I had posted an entry about the WPF perf tools being part of the SDK.. One of the readers asked for a separate installable since the SDK is huge and downloading the SDK just for the perf tools really didnt make sense... So we listened, and the WPF perf tools are now available as a separate installable .. Download: x86 and x64 versions Share this post Read More... Posted Tuesday, June 12, 2007 10:32 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, WPF tools, .NET 3.0, WPF samples, Windows Presentation Foundation

• WPF Blog Writer

  Recently, I was trying my hand at creating a simple blog writer. The writer came out pretty nice. The app makes use of a base richEditor control (thanks to Praj ).. After a bit of tweaking it ended up like the above... So the app just makes a simple call in the xaml <custom:RichEditor/> ...tada ... you have it there!!! The next thing is to write to a blog... In this case, the writer is coded to post the entry on blogger, which makes use of the Google data API .. this could easily be changed for other blogs. It also makes use of a Xaml-HTML converter as the string passed needs to be in HTML. For now, its a blog writer - hence, it onluy writes. But it could easily be extended into a full blown Blog client. Do I hear anyone taking it up :) The code is attached .. so have fun with it .. Share this post Read More... Posted Tuesday, June 05, 2007 3:47 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Vista, Windows Presentation Foundation

• Xaml shield image in plain Xaml

  just came across a post which includes xaml to display the xaml shield. That looks sweet.. and all the more when its in Xaml... Xaml code attached Share this post Read More... Posted Wednesday, May 23, 2007 4:56 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Windows Presentation Foundation

• Vista style Open/Save FileDialogs

  If you have tried creating FileDialogs in WPF, they usually do not blend well into the Vista look. The solution is to use the wrappers provided in the VistaBridge library which is part of the SDK samples. You could include the library dll (around 100k) in your project and then make the simple call to CommonOpenFileDialog/CommonSaveFileDialog ... The other option being to just include the specific classes in the project. CommonSaveFileDialog saveDialog = new CommonSaveFileDialog (); Its that easy!! Share this post Read More... Posted Monday, May 14, 2007 1:49 PM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Vista, Windows Presentation Foundation

• Xaml FlowDoc to XPS

  Feng Yuan has a nice blog post on how to convert FlowDocuments to an XPS document with the header. The code is in the form of a wrapper class so its gonna be handy. I tried out the code on a RichTextBox and it worked like a charm J I reused one of my old samples and it looks great :) ... The sample code is attached . (PS: Do make a point a read the original post for code specific details) Share this post Read More... Posted Friday, March 30, 2007 11:43 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Windows Presentation Foundation

• Sample form using listview

  Recently I was clearing up my documents and I came across this sample I made. Thought it might be useful to someone out there and here it is. It’s basically something like a form but which dynamically grows as and when you fill up the rows. So the typical ‘Add New Row’ button is missing. J … Red (more like pink) rows indicate values being empty; green being obvious. :) .. Typically, you would be using a combobox instead of the textbox. It would result in a better perf experience. The code is simple using a listview which is bound to the data. This might look very familiar to Product Studio if you have used it ;) Code is attached Share this post Read More... Posted Saturday, March 17, 2007 11:43 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Windows Presentation Foundation

• BitmapSource-Bitmap interop

  Recently I was trying my hand at a rough image editing scenario and one of the things was changing into gray scale, brightness and so forth. If you have played with .NET 2.0 you get quite a few functions which help in these types of operations and it would be nice shifting Images to Bitmaps and vice versa. As luck would have it, Robert had posted some code on this in the forums. To get the Bitmap you would have to call CopyPixels on the BitmapSource and convert it to a Bitmap- transformedBitmapSource.CopyPixels(bits, stride, 0); unsafe { fixed ( byte * pBits = bits) { IntPtr ptr = new IntPtr (pBits); System.Drawing. Bitmap bitmap = new System.Drawing. Bitmap ( width,height,stride, System.Drawing.Imaging. PixelFormat .Format32bppPArgb,ptr); return bitmap; } } To do the reverse: System.Windows.Media.Imaging. BitmapSource bitmapSource = System.Windows.Interop. Imaging .CreateBitmapSourceFromHBitmap( bitmap.GetHbitmap(), IntPtr .Zero, Int32Rect .Empty, System.Windows.Media.Imaging. BitmapSizeOptions Read More... Posted Thursday, March 08, 2007 11:50 AM from Lester's WPF blog | 0 Comments Filed under: WPF, Avalon, Programming, .NET 3.0, WPF samples, Vista, Windows Presentation Foundation