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In software, it is generally accepted practice that a modular design is better than a monolithic design. However, it is true that some modular designs are better than others. There are two specific aspects that are common among good modular designs loose coupling and high cohesion. Coupling and cohesion are distinct but related metrics used to measure the strength of dependencies between modules and the internal consistency within individual modules, respectively. Coupling strength is measured from tight (bad) to loose (good). Two modules are tightly coupled when they have strong dependencies between them. If one module changes, it is inevitable that the second module will also change, such is their reliance on each other. However, if modules are loosely coupled, they are insulated from many changes that can be made without a concomitant impact. In a world of fluid requirements with an emphasis on refactoring, this protection is invaluable. Cohesion, on the other hand, is measured from weak (bad) to strong (good). A module is considered to have weak cohesion if it performs too many irrelevant functions that it should not concern itself with. For example, it is very common for modules to log certain diagnostic messages to the debug console or to a file, but this is irrelevant to the problem that the module is intended to solve. Instead, the logging functionality should be factored out into its own module and such cross-cutting requirements should be implemented as aspects. A highly cohesive module focuses solely on its main intent and does not deviate from it or dilute it in any way. Figure 3 11 shows a hypothetical graph that plots coupling against cohesion.

The TextBlock class. Wherever you place text, there s TextBlock object using OnRender() to draw it. The Image class. The Image class overrides OnRender() to paint its image content using the DrawingContext.DrawImage() method. The MediaElement class. The MediaElement overrides OnRender() to draw a frame of video, if it s being used to play a video file. The shape classes. The base Shape class overrides OnRender() to draw its internally stored Geometry object, with the help of the DrawingContext.DrawGeometry() method. This Geometry object could represent an ellipse, a rectangle, or a more complex path composed of lines and curves, depending on the specific Shapederived class. Many elements use shapes to draw small visual details.

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When you were using the identity selector, you likely noticed that the screen behind the identity selector went dark. The identity selector actually is running in a separate private desktop much like you would see when you press Ctrl+Alt+Delete. Why is this important By placing the identity selector on a separate desktop, you make it much more difficult to spoof the identity selector user interface (UI). As a result, this provides an additional barrier to would-be attackers.

The chrome classes. Classes such as ButtonChrome and ListBoxChrome draw the outer appearance of a common control and place the content you specify inside. Many other Decorator-derived classes, such as Border, also override OnRender(). The panel classes. Although the content of a panel is supplied by its children, the OnRender() method takes care of drawing a rectangle with the background color if the Background property is set.

Often, the OnRender() implementation is deceptively simple. For example, here s the rendering code for any Shape-derived class: protected override void OnRender(DrawingContext drawingContext) { this.EnsureRenderedGeometry(); if (this._renderedGeometry != Geometry.Empty) { drawingContext.DrawGeometry(this.Fill, this.GetPen(), this._renderedGeometry); } } Remember, overriding OnRender() isn t the only way to render content and add it to your user interface. You can also create a DrawingVisual object and add that visual to a UIElement using the AddVisualChild() method (and implementing a few other details, as described in 14). You can then call DrawingVisual.RenderOpen() to retrieve a DrawingContext for your DrawingVisual and use it to render its content. Some elements use this strategy in WPF to display some graphical detail overtop other element content. For example, you ll see it with drag-and-drop indicators, error indicators, and focus boxes. In all these cases, the DrawingVisual approach allows the element to draw content over other content, rather than under it. But for the most part, rendering takes place in the dedicated OnRender() method.

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