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s long as developers have had graphical windows to play with, there have been heated debates about the best ways to organize these windows into applications. Although there are hundreds of possibilities, most user interfaces tend to fall into one of three categories: MDI (multiple document interface). MDIs start with a single container window that represents the entire application. Inside the container window are multiple child windows. Depending on the type of application, these child windows might represent different documents the user is editing at the same time or different views of the same data. Visual Studio is an MDI application. SDI (single document interface). SDIs can open only a single document at a time. Notepad is an example of an SDI application if you want to open two text files at once, you need to fire up two instances of Notepad. MFI (multiple frame interface). MFIs place each document into a completely separate window, which gets a separate button on the taskbar. When you open multiple documents in an MFI application, it looks as though there are multiple instances of the application running at once (similar to an SDI application). However, the underlying architecture is different. Word is an MFI application even though each document has its own separate window, you can use the Window menu to jump from one to another, because they re really all part of one application. In this chapter, you ll learn how to use these different models, and you ll learn about the specific MDI features that are included in .NET. You ll also learn how to use basic window management and synchronization with the document-view architecture.

Early Windows applications were only designed to deal with one task a time. For example, if you wanted to edit two text files, you opened two instances of Notepad. This is still the way that many small-scale Windows applications work today, including the Calculator, Paint, and Notepad accessories that are included with Windows. (All the examples you ve seen in this book so far are SDI applications.)

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This VM image comes with the latest Mono runtime and development tools preinstalled, so there s no need to worry about setting up any of these. But the image does not currently include the F# compiler, so you will need to install it using the following instructions. I performed all of these steps as the root account. Still in the /usr/lib/fsharp directory, run the command sh install-mono.sh. Unpack the F# distribution and copy the resulting files to /usr/lib/fsharp. In the /usr/lib/fsharp directory, run chmod +x install-mono.sh. Run the dos2unix tool on the text file install-mono.sh. Still in the /usr/lib/fsharp directory, run the command sh install-mono.sh. After performing those steps, I was able to use F# from the command line of any account by running mono/usr/lib/fsharp/bin/fsc.exe, followed by the command-line options. Obviously, this was inconvenient to run every time, so I created a shell script file in /usr/bin and as fsc. #!/bin/sh exec /usr/bin/mono $MONO_OPTIONS /usr/lib/fsharp/bin/fsc.exe "$@" I then ran chmod +x fsc to give users permission to execute it. After this, running the F# compiler was as simple as typing fsc at the command line. The F# interactive compiler, fsi.exe, the shell script for this is as follows: #!/bin/sh exec /usr/bin/mono $MONO_OPTIONS /usr/lib/fsharp/bin/fsi.exe --no-gui "$@" Figure 2-2 shows F# interactive running under Mono and Linux.

Soon after, the first MDI applications appeared. MDI applications were perfect for documentcentric applications, because they allowed you to work with several documents in a single work environment (see Figure 19-1). The hallmarks of a typical document-centric MDI application include a main window, a common set of toolbars, and a top-level Window menu. The Window menu provides a list of all the open documents, and allows you to switch from one to another quickly. Often, MDI applications let you tile or cascade child windows to view several documents side by side. They may also include floating or dockable tool windows that provide access to additional features.

You can also access the dialog box to change the password for a user by right-clicking the user Tip

Figure 19-1. Visio: An MDI There are essentially two types of MDI applications: Document applications. These applications use a single application window to contain multiple identical document windows. In a word processing program, this might provide a simple way for a user to work with several files at once.

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