Snippets in category User Interface
Form changing color
Windows Forms tutorial showing how to create form with button and how to register an event handler. When the button is clicked, the form changes its background color.
29 people like this
Posted: 1 years ago by Tomas PetricekLoad XAML
This example shows how to load a Xaml file allowing to use WPF from F#. It also shows how to access WPF objects and register event handlers.
59 people like this
Posted: 1 years ago by Antonio CisterninoFSX Structure
I use this basic template when writing .fsx files that I might want to compile. It adjusts the difference in command line/entrypoint handling between a script and a compiled assembly. This example shows the details for a WPF script — replace the #r's and/or remove the STAThread for a WinForms or Console script.
66 people like this
Posted: 1 years ago by Blake CoverettWinForms layout combinators
A domain specific language for creating layout using Windows Forms. The snippet implements combinators for creating controls and simple automatic arrangement of them.
17 people like this
Posted: 1 years ago by Tomas Petricekdebugging window
The window is useful when you want to print out data to the screen.
9 people like this
Posted: 1 years ago by Stefan KnoblauchObservableObject
The ObservableObject type implements the INotifyPropertyChanged interface used in WPF and Silverlight to notify on changes to properties that are bound to a control. Specify property names type safely using F# Quotations, i.e. <@ this.PropertyName @> when invoking the NotifyPropertyChanged method. If you are following the MVVM pattern then your View Model class can inherit from the ObservableObject type.
45 people like this
Posted: 1 years ago by Phillip TrelfordObservable.Subject
The Subject<T> type implements both IObserver<T> and IObservable<T>. It is functionally equivalent to the type of the same name in the Reactive Extensions (Rx) library.
13 people like this
Posted: 1 years ago by Phillip TrelfordWPF Custom Control
This snippet shows how to create a WPF custom control library in F#.
30 people like this
Posted: 1 years ago by FahadWPF DepdencyProperty
Declaring WPF DependencyProperty in F#
16 people like this
Posted: 1 years ago by FahadChronological sequence window beginnings
An abstraction of the following use case: Given a sequence of dates and max temperatures for each date, extract out the initial dates on which the temp is greater than a given threshold for n consecutive days. (Originally posted as an answer to this StackOverflow question: http://stackoverflow.com/questions/5267055 )
10 people like this
Posted: 1 years ago by ildjarnPretty Print Source Code Errors
A snippet that allows you to pretty print source code errors
13 people like this
Posted: 1 years ago by fholmWeb Crawler
This snippet features an F# Web crawler that i'm already using in 2 applications (slightly modified). It's based on a scalable network of communicating agents that follow URLs extracted from HTML pages until reaching the specified limit.
20 people like this
Posted: 1 years ago by Taha HachanaF# Quotations with INotifyPropertyChanged
ViewModelBase for F# users who want to use it in WPF / Silverlight
6 people like this
Posted: 1 years ago by FahadWebSharper Hello World
This sample implements "Hello, world!" as a WebSharper application. It demonstrates how to compose HTML/XML using combinators, how to dynamically create a button with a handler and how to update an existing DOM element.
2 people like this
Posted: 12 months ago by Tomas PetricekStructural BeginUpdate / EndUpdate with Lambda
Several WinForms controls, like TreeView and ListView, implement methods BeginUpdate and EndUpdate, which suspend repainting of the control while items are being individually added to a control, preventing flicker caused by rapid repainting. But using BeginUpdate and EndUpdate is very imperative, and opens up the possibility for bugs, such as neglecting to call the matching EndUpdate. An obvious improvement would be to create an extension method on types implementing this pattern which takes a unit -> unit lambda which is executed between update pairs. But the pattern is only conventional, rather than through a common base class or interface. Hence this presents a reasonable opportunity to use F#'s statically resolved structural type system to implement a function which only works on Control types with the correct structural signature.
2 people like this
Posted: 12 months ago by Stephen SwensenA fun-ny WPF DataTemplate DSL
Parts of a little DSL to create WPF DataTemplate's in F#. Don't even want to think about the length of a corresponding C#. The F# code corresponds 1-to-1 to the visual tree constructed for the template.
5 people like this
Posted: 11 months ago by Cetin SertSimple F# ViewModel for Silverlight MVVM
Silverlight default architecture is Model-View-ViewModel. This code gives full design time support for Microsoft Expression Blend. The F# ViewModel is seen as strongly typed data source in the Blend UI. There are two properties binded to the view: HiLabel (OneWay data binding) and MyName (TwoWay data binding). ViewModel implements the INotifyPropertyChanged to support the binding. The view project (HelloApp) is made with Blend (by designers) and it is Silverlight 5.0 project. The view codebehind is c# file and it has only this.DataContext -assignment. The viewmodel project (HelloApp.ViewModel) is F# Silverlight 4.0 library. It is made with VS2010 and F# (by developers). It contains the logical functionality of the current view.
4 people like this
Posted: 11 months ago by Tuomas HietanenReplaySubject
The ReplaySubject<T> type implements both IObserver<T> and IObservable<T>. It is functionally equivalent to the class of the same name in the Reactive Extensions (Rx) library with a replay buffer of a specified size .
1 people like this
Posted: 11 months ago by Phillip TrelfordRichTextBox SQL highlighting
Simple RichTextBox SQL highlighting with win32 LockWindowUpdate DllImport
7 people like this
Posted: 11 months ago by nCdyWPF/Silverlight Value Converter
Example of a WPF/Silverlight Value Converter base class and concrete implementation.
5 people like this
Posted: 10 months ago by Tao Liu and Daniel Mohl
WPF/Silverlight Attached Property
Example of a WPF/Silverlight Attached Property (AP). This is a port of a C# AP implementation that can be found at http://www.silverlightshow.net/items/Attached-Properties-in-Silverlight.aspx.
2 people like this
Posted: 10 months ago by Daniel MohlWPF Event to Command
This snippet provides an example of a WPF Event to Command behavior.
3 people like this
Posted: 10 months ago by Daniel MohlBasic WinForms drag and drop
Quick example of using drag-n-drop with WinForms.
3 people like this
Posted: 9 months ago by MichaelGG12 - Function Display
Complex function display with two Argand planes, and dots. Added exponential function.
Coroutine
An implementation of Coroutine by using a continuation monad. it's using a monad library [1]. [1] https://github.com/fsharp/fsharpx
3 people like this
Posted: 8 months ago by einblickerWPF / SilverLight Converter II
version 1 is http://fssnip.net/62. This new version support convert from any existing function to a converter function by using composition and pipeline. The convert function is to make the function signature agree to the IValueConverter interface. You can add new functions in the FunctionLibrary module and reuse the class definition to reduce the coding effort. The first sample is to show how to make the converter pipeline work, the second one is a debugger converter used to debug the data binding problem.
74 people like this
Posted: 8 months ago by Tao LiuCreating observable using Async.StartDisposable
Implements a simple Async.StartDisposable extension that can be used to easily create IObservable values from F# asynchronous workflows. The method starts an asynchronous workflow and returns IDisposable that cancels the workflow when disposed.
4 people like this
Posted: 8 months ago by Tomas PetricekSliding window for Observable
Implements the Observable.windowed function that creates an observable returning a sliding window. The function is an observable version of Seq.observable. The implementation uses a simple F# agent that keeps partial windows and sends them to an observer.
3 people like this
Posted: 8 months ago by Tomas PetricekSemi-Coroutine
This snippet implements a semi-coroutine by continuations.
2 people like this
Posted: 6 months ago by einblickerBuilding a WPF application in functional way
I started to write pure F# + WPF application in about half a year ago. Today, I found a good way to compose WPF controls with dependent values. It's only writing a dependency object type as a class and give it to constructors of GUI controls. In this snippet "Volume","ColorVolume" and "ShapeContainer" has no properties. But works as a View which represents internal Model and allows users to change internal data. You only need calling a constructor of them. It means that you can compose GUI controls and it's functionality as a immutable data structure. (Update 2011/12/02 8:33:00(UTC+09:00) : Removed some user defined operators and renamed a type similar to DependencyObject in this snippet Reactor to SharedValue.) (Update 2011/12/02 9:04:01(UTC+09:00) : renamed some variables..)
6 people like this
Posted: 5 months ago by nagat01Union Editor for WinForms PropertyGrid
A quick-and-dirty editor for discriminated unions in a property grid. I use this for editing trees of F# records and unions. Note that any records must have a "Default" static property which returns a default instance.
3 people like this
Posted: 5 months ago by Rick MinerichObservable Async Subject
Simple Async Observable Subject<'T> based on MailboxProcessor. Type declaration is more ML like, but the idea is represented in a simple way!
4 people like this
Posted: 5 months ago by FahadDrag move for GUI controls
This script opens a window with a red rectangle which is moved by dragging. I like writing interactive GUI without MVVM, FRP and Markup language.
3 people like this
Posted: 4 months ago by nagat01Send HTTP POST request
The snippet shows how to send HTTP POST request to a web page and download the generated HTML result. The POST data is encoded as a byte array and written to the request stream of HttpWebRequest.
2 people like this
Posted: 3 months ago by Tomas PetricekAuto-completion in any winforms text box
The standard windows.forms text box supports auto-completion, but only for single-line text boxes. The code below can be used to add auto-completion against a fixed set of words to any text box that inherits from TextBoxBase.
3 people like this
Posted: 3 months ago by Johann DeneuxWPF Command in F#
demonstrate how to use object expression to create a WPF/Silverlight command.
17 people like this
Posted: 2 months ago by Tao LiuSierpinski triangle, WPF
Draws a Sierpinski triangle using WPF
8 people like this
Posted: 2 months ago by Mathias BrandewinderHTML File Type
Discriminated unions to represent a HTML file.(not completely)
2 people like this
Posted: 1 months ago by Gab_kmSpeech Stackoverflow article automatically
This snippet automatically speeches text of question,answers and comments in a Stackoverflow article. It requires HtmlAgilityPack(available from Nuget package manager).(Attention: You need reset F# interactive to stop the speech)
5 people like this
Posted: 7 days ago by nagat01