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In the declaration of dtProductInfo in Listing 5-3, note the Ellipse with its Fill property bound to InventoryLevelBrush and the TextBlock with its Text property bound to InventoryLevelMessage. These are both calculated values, exposed as properties on the Product class extended using the partial class facility, as shown in Listing 5-4. The InventoryLevelBrush property returns a SolidColorBrush of different colors based on whether the total inventory is above or below certain levels, indicated by the SafetyStockLevel and ReorderPoint properties of the Product data class. The InventoryLevelMessage property applies the same logic to return differently formatted text messages instead.

You want to display a portion of the UI in a pop-up in response to an input event such as a mouse click.

Pop-ups are frequently used in UI design to display on-the-fly information in response to input events. Typical examples include cascading menus, context menus, the drop-down portion of a combo box, and tooltips. Silverlight includes a type named Popup in the System.Windows.Controls.Primitives namespace. The Popup type is used by several other controls in the framework, such as the DatePicker, the ToolTip, and the DataGrid. You can use it in your own code as well.

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Listing 6-3 is a code snippet extracted from index.zul. This snippet creates an image imagemap component, and uses its src property to specify the source of the image file the green parrot surrounded with other pets icons in home page. Secondly, we use the area component to locate the region of each of the pet icons in this image file. The position, range, and shape of area is defined by its coordinates ( coords) attribute. An area component supports three kinds of shapes: circle, polygon, and rectangle. In this example, we pass four parameters into coords, so the shape of each area is a square, and its range is defined by those coordinates. And, the tooltiptext attribute of area sets the message to show when the user mouses over the area.

The Popup type is not a control it derives directly from the FrameworkElement type. It is meant to be a container for a tree of elements and, therefore, has no visual representation of its own. While you can include a Popup in XAML, because of positioning requirements, it is much more common to create an instance of the Popup in code and set its Child property to the root of the element tree representing the content you want to display inside the Popup. This code shows setting a ListBox as the Popup.Child: Popup popupProducts = new Popup(); ListBox popupContent = new ListBox(); popupProducts.Child = popupContent; Once you have prepared the Popup, you can toggle the Popup.IsOpen property to show or hide it.

In most cases, you want to display the Popup at a dynamically determined position on the page, relative to coordinates of an input event, such as a mouse click, or to that of some other element on the form. This explains why a Popup is typically not included by a designer in the XAML for the page but rather created in code it does not make sense to subject it to the constraints of the layout system and determine its position up front unless you are using absolute positioning and a container like the Canvas.

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