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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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let maxit = (iterations tl br) let tlx, tly = tl let brx, bry = br Clipboard.SetText (sprintf "<Mandel iter=\"%d\"> <topleft><re>%.14e</re><im>%.14e</im></topleft> <bottomright><re>%.14e</re><im>%.14e</im></bottomright> </Mandel>" maxit tlx tly brx bry) ) |> ignore copy.ShortcutKeyDisplayString <- "Ctrl+C" copy.ShortcutKeys <- Keys.Control ||| Keys.C paste.Click.Add(fun _ -> if Clipboard.ContainsText() then let doc = new XmlDocument() try doc.LoadXml(Clipboard.GetText()) menuIterations <int (doc.SelectSingleNode("/Mandel").Attributes.["iter"].Value) tl <- (float (doc.SelectSingleNode("//topleft/re").InnerText), float (doc.SelectSingleNode("//topleft/im").InnerText)) br <- (float (doc.SelectSingleNode("//bottomright/re").InnerText), float (doc.SelectSingleNode("//bottomright/im").InnerText)) rect <- Rectangle.Empty updateView() with _ -> () ) |> ignore paste.ShortcutKeyDisplayString <- "Ctrl+V" paste.ShortcutKeys <- Keys.Control ||| Keys.V zoomin.Click.Add(fun _ -> zoom 0.9 tl br) |> ignore zoomin.ShortcutKeyDisplayString <- "Ctrl+T" zoomin.ShortcutKeys <- Keys.Control ||| Keys.T zoomout.Click.Add(fun _ -> zoom 1.25 tl br) |> ignore zoomout.ShortcutKeyDisplayString <- "Ctrl+W" zoomout.ShortcutKeys <- Keys.Control ||| Keys.W for x in [ f;e;c ] do m.Items.Add(x) |> ignore f.DropDownItems.Add(ext) |> ignore let tsi x = (x :> ToolStripItem) for x in [ tsi cols; tsi its; tsi fillMode] do c.DropDownItems.Add(x) |> ignore for x in [ tsi copy; tsi zoomin; tsi zoomout ] do e.DropDownItems.Add(x) |> ignore for x in ["HSL Color"; "Gray"; "Red"; "Green"] do cols.Items.Add(x) |> ignore fillMode.DropDownItems.Add(fillModeLinear) |> ignore fillMode.DropDownItems.Add(fillModeBlock) |> ignore cols.SelectedIndex <- 0 cols.DropDownStyle <- ComboBoxStyle.DropDownList cols.SelectedIndexChanged.Add(fun _ -> palette <- createPalette coloring.[cols.SelectedIndex] stopWorker() drawMandel() c.HideDropDown() )
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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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its.Text <- string_of_int menuIterations its.DropDownStyle <- ComboBoxStyle.DropDown for x in [ "150"; "250"; "500"; "1000" ] do its.Items.Add(x) |> ignore its.LostFocus.Add(itchg) its.SelectedIndexChanged.Add(itchg) fillModeBlock.Checked <- true fillModeLinear.Click.Add(setFillMode fillMode fillModeLinear linearFill) fillModeBlock.Click.Add(setFillMode fillMode fillModeBlock blockFill) m clearOffScreen bitmap form.MainMenuStrip <- setupMenu() form.Controls.Add(form.MainMenuStrip) form.MainMenuStrip.RenderMode <- ToolStripRenderMode.System form.Paint.Add(fun arg -> paint arg.Graphics) form.MouseDown.Add(click) form.MouseMove.Add(mouseMove) form.ResizeEnd.Add(fun _ -> resize()) form.Show() Application.DoEvents() drawMandel() [<STAThread>] do Application.Run(form) You should use the program s last statement only if the application is compiled; with fsi.exe, it must be omitted. As already noted, the plumbing code is dominated by setting up menus and configuring the application form; the rest contains the event handlers that are registered with the various controls.
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Windows Presentation Foundation
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Microsoft introduced a new presentation framework called Windows Presentation Foundation (WPF) for programming graphical applications on the Windows platform with Windows Vista. It s not merely a new framework such as Windows Forms; rather than another layer on top of the traditional Win32 presentation system, it s a complete new rendering system that coexists with the traditional one.
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Note WPF is a .NET framework and thus accessible to F# applications. In Visual Studio 2010, the tight
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integration with XAML markup language used by WPF isn t supported by the F# project system, and you should instead add your XAML files to your Visual Studio solution. You can use F# to develop Silverlight code, because Silverlight is a web plug-in featuring a subset of WPF capabilities.
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At first sight, a WPF application doesn t differ much from a Windows Forms application. Here are few lines of code to open a window from F# Interactive:
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CHAPTER 11 BUILDING GRAPHICAL USER INTERFACES
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#r #r #r #r
"WindowsBase" "PresentationCore" "PresentationFramework" "System.Xaml"
open System.Windows open System.Windows.Controls let w = new Window() let b = new Button(Content="Hello from WPF!") b.Click.Add(fun _ -> w.Close()) w.Content <- b w.Show() The application has an event loop (see the sidebar WPF Event Loop ) hosted by F# Interactive. With a few (very important) differences, you ve created a window hosting a huge button that closes it when clicked.
WPF Event Loop
WPF applications have an event loop because events are still one of the foundations of this new presentation system; this event loop, however, differs from that used by Windows Forms applications. It s started through an instance of the System.Windows.Application class (note that in Windows Forms, the System.Windows.Forms.Application class is used as a singleton without the need to create instances). To run the button example as a standalone application, you must add the same references to the F# project. And instead of the w.Show() method invocation, you can add the following lines:
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