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There s a trick here. If you want to put additional options in the same menu that has the window list (for example, options to rearrange the windows, as you ll see in the next section), you ll probably want to add a separator between your items and the window list. However, you don t want this separator to appear if there are no children, because it looks odd at the bottom of the menu. The easiest solution is to handle the DropDownOpening and DropDownClosed events of the ToolStripMenuItem for the Window menu, and hide or show the separator as required. The following code implements a reasonably generic approach that works even if you change the number of items in the menu or the variable name of the separator. private void windowToolStripMenuItem_DropDownOpening(object sender, EventArgs e) { if (this.MdiChildren.Length == 0) { // There are no children. // The last item in the menu must be a separator. Hide it. int lastItem = windowToolStripMenuItem.DropDown.Items.Count - 1; windowToolStripMenuItem.DropDown.Items[lastItem].Visible = false; } } private void windowToolStripMenuItem_DropDownClosed(object sender, EventArgs e) { if (this.MdiChildren.Length == 0) { int lastItem = windowToolStripMenuItem.DropDown.Items.Count - 1; windowToolStripMenuItem.DropDown.Items[lastItem].Visible = true; } }

If you want to add the support for tiling and cascading windows, you ll probably also add these options to this menu. Every MDI container supports a LayoutMdi() method that accepts a value from the MdiLayout enumeration, and arranges the windows automatically. For example, here s the code to tile windows horizontally in response to a menu click in the Parent form: private void mnuTileH_Click(object sender, System.EventArgs e) { this.LayoutMdi(MdiLayout.TileHorizontal); }

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The other common tasks that you need to perform with enumerations is to combine them using a logical or and then test them using a logical and. Enum types marked with the System.Flags attribute support the use of the &&& and ||| operators to perform these operations directly. For example, you can use ||| operator to combine several enum values. You can test to see if value is part of an enum using the &&& operators in the form v1 &&& v2 <> enum 0: open System.Windows.Forms let anchor = AnchorStyles.Left ||| AnchorStyles.Left printfn "test AnchorStyles.Left: %b" (anchor &&& AnchorStyles.Left <> enum 0) printfn "test AnchorStyles.Right: %b" (anchor &&& AnchorStyles.Right <> enum 0)

Of course, it s just as easy to create your own custom layout logic. Here s the code for a menu option that minimizes all the open windows: private void mnuMinimizeAll_Click(object sender, System.EventArgs e) { foreach (Form frm in this.MdiChildren) { frm.WindowState = FormWindowState.Minimized; } } Figure 19-7 summarizes some of the layout options.

error stating that the parameter is incorrect. Don t worry; enter the passwords again in the relevant boxes and click Retry.

Another unique characteristic of MDI applications is their treatment of menus. If you create a child form with a menu, that menu is added to the main menu when the child form is displayed. This behavior allows you to provide different options depending on the current view, but presents a centralized menu to the user.

This module contains F# s own version of reflection. F# contains some types that are 100 percent compatible with the CLR type system, but aren t precisely understood with .NET reflection. For example, F# uses some sleight of hand to implement its union type, and this is transparent in 100 percent F# code. It can look a little strange when you use the BCL to reflect over it. The F# reflection system addresses this kind of problem. But, it blends with the BCL s System.Reflection namespace, so if you are reflecting over an F# type that uses BCL types, you will get the appropriate object from the System.Reflection namespace. In F#, you can reflect over types or over values. The difference is a bit subtle and is best explained with an example. Those of you familiar with .NET reflection might like to think of reflection over types as using the Type, EventInfo, FieldInfo, MethodInfo, and PropertyInfo types and reflections over values as calling their members, such as GetProperty or InvokeMember to get values dynamically. Yet reflection over values offers a high-level, easy-to-use system. Reflection over types: Lets you examine the types that make up a particular value or type. Reflection over values: Let you examine the values that make up a particular composite value.

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