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Now that you have your dependency properties defined, you can add standard property wrappers that make them easier to access and usable in XAML. public Color Color { get { return (Color)GetValue(ColorProperty); } set { SetValue(ColorProperty, value); } } public byte Red { get { return (byte)GetValue(RedProperty); } set { SetValue(RedProperty, value); } } public byte Green { get { return (byte)GetValue(GreenProperty); } set { SetValue(GreenProperty, value); } } public byte Blue { get { return (byte)GetValue(BlueProperty); } set { SetValue(BlueProperty, value); } } Remember, the property wrappers shouldn t contain any logic, because properties may be set and retrieved directly using the SetValue() and GetValue() methods of the base DependencyObject class. For example, the property synchronization logic in this example is implemented using callbacks that fire when the property changes through the property wrapper or a direct SetValue() call. The property change callbacks are responsible for keeping the Color property consistent with the Red, Green, and Blue properties. Whenever the Red, Green, or Blue property is changed, the Color property is adjusted accordingly: private static void OnColorRGBChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { ColorPicker colorPicker = (ColorPicker)sender; Color color = colorPicker.Color; if (e.Property == RedProperty) color.R = (byte)e.NewValue; else if (e.Property == GreenProperty) color.G = (byte)e.NewValue; else if (e.Property == BlueProperty) color.B = (byte)e.NewValue; colorPicker.Color = color; }

Because the Text and Content properties don t use collections, you can t include more than one piece of content. For example, if you attempt to nest multiple elements inside a Button, the XAML parser will throw an exception. The parser also throws an exception if you supply nontext content (such as a Rectangle).

Note As a general rule of thumb, all controls that derive from ContentControl allow a single nested element. All

Note This sample code is written for PHP 5 and is dependent on the mcrypt and OpenSSL libraries. Please validate that these are part of your PHP installation. You can download OpenSSL from http:// www.openssl.org/. For use with PHP 5, you will need version 0.9.6 or higher. You can download mcrypt from http://sourceforge.net/projects/mcrypt.

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controls that derive from ItemsControl allow a collection of items that map to some part of the control (such as a list of items or a tree of nodes). All controls that derive from Panel are containers that are used to organize groups of controls. The ContentControl, ItemsControl, and Panel base classes all use the ContentProperty attribute.

XAML is bound by the rules of XML. For example, XML pays special attention to a few specific characters, such as & and < and >. If you try to use these values to set the content of an element, you ll run into trouble because the XAML parser assumes you re trying to do something else such as create a nested element. For example, imagine you want to create a button that contains the text <Click Me>. The following markup won t work: <Button ... > <Click Me> </Button> The problem here is that it looks like you re trying to create an element named Click with an attribute named Me. The solution is to replace the offending characters with entity references specific codes that the XAML parser will interpret correctly. Table 2-1 lists the character entities you might choose to use. Note that the quotation mark character entity is required only when setting values using an attribute because the quotation mark indicates the beginning and ending of an attribute value.

This is a colloquial way of saying implement only what you need, nothing more. Read requirements carefully and pay attention to the context of the problem domain. Sometimes, a class s name is so evocative that it conjures up all sorts of cool and interesting possibilities, most of which may be completely unnecessary. Try to avoid the temptation to include anything that is superfluous to the requirements. Refer back to the EmailAddress class in Listing 3 9. Two side-effects occurred as a result of hiding the underlying representation in this example: The email address can never be edited once constructed it is immutable The email address can no longer be read as a string

Less than (<) Greater than (>) Ampersand (&) Quotation mark (")

< > & "

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