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Figure 21-5. A dynamic button generator One of the key challenges with this approach is that you need to place each control exactly. If you have a modestly detailed user interface, you ll need some extremely messy calculations to determine the correct coordinates and size for each element. One way to deal with these problems is to use a control layout engine, as described in the next section.

Tip The button generator is a proof-of-concept example. On its own, it doesn t do anything useful. In the

// constants that relate to the size and position // of the tree let center = gClipBoundsWidth / 20F let maxWidth = 320F * raise2ToPower (getDepth t) You implement the rest of the function by breaking it down into inner functions You define drawLeaf to take care of drawing leaf nodes: // function for drawing a leaf node let drawLeaf (x : float32) (y : float32) v = let value = sprintf "%A" v let l = gMeasureString(value, font) gDrawString(value, font, brush, x - (lWidth / 20F), y) You use connectNodes to take care of drawing the connections between nodes, where appropriate: // draw a connector between the nodes when necessary let connectNodes (x : float32) y p = match p with | Some(px, py) -> g.

following sections, you ll see how you can adapt the same technique to create a much more practical application.

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Figure 7-34. Viewing the contents of the backup file 8. Drag and drop the file or files you want to restore anywhere on your computer, or copy them to a USB flash drive or other device if that s easier for you.

If you re creating highly dynamic forms, you need a way to create the controls and a technique to ensure they all end in the right place. You could calculate control sizes and positions by hand, but it can quickly lead to complex and convoluted code. Another solution is to use one of .NET s layout panels. These container controls, which are new in .NET 2.0, automatically organize all the contained child controls based on specific rules. The control layout panels extend the possibilities for form layout, but they also complicate your application. As a general rule of thumb, you shouldn t use a control layout engine if you can get all the functionality you need using docking, anchoring, the Control.AutoSize property, and container controls like the Panel and SplitContainer (which are described in 3). These controls allow you to create a wide range of control layouts, and are easy to work with at design time. However, if you need to programmatically create a highly configurable interface or you need one of the specific resizing behaviors discussed in the following sections, you can consider using a specialized layout control instead.

public partial class SmallOrLargeForm : Form { public SmallOrLargeForm () { this.Font = SystemFonts.IconTitleFont; InitializeComponent(); SystemEvents.UserPreferenceChanged += new UserPreferenceChangedEventHandler(SystemEvents_UserPreferenceChanged); } private void SystemEvents_UserPreferenceChanged(object sender, UserPreferenceChangedEventArgs e) { if (e.Category == UserPreferenceCategory.Window) { this.Font = SystemFonts.IconTitleFont; } } protected override void Dispose(bool disposing) { if (disposing) { SystemEvents.UserPreferenceChanged -= new UserPreferenceChangedEventHandler( SystemEvents_UserPreferenceChanged); if (components != null) components.Dispose(); } base.Dispose(disposing); } } Assuming the Form.AutoScaleMode is set to AutoScaleMode.Font (the default), your form and all its controls will resize to fit the new fonts. However, the result still isn t perfect, and you may find that your alignment goes slightly out of whack with some controls. A better solution to dealing with on-screen elements that may change in size is to use the layout controls described in 21.

DrawLine(pen, px, py, x, y) | None -> () Finally, you define drawTreeInner as a recursive function that does the real work of walking the Tree type and drawing it: // the main function to walk the tree structure drawing the // nodes as we go let rec drawTreeInner t d w p = let x = center - (maxWidth * w) let y = d * 320F connectNodes x y p match t with | Node (l, r) -> gFillPie(brush, x - 30F, y - 30F, 70F, 70F, 00F, 3600F) let d = (d + 10F) drawTreeInner l d (w + (10F / d)) (Some(x, y)) drawTreeInner r d (w - (10F / d)) (Some(x, y)) | Leaf v -> drawLeaf x y v This function uses parameters to store values between recursive calls.

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