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public Elements CurrentElement { get { return (Elements)GetValue(CurrentElementProperty); } set { SetValue(CurrentElementProperty, value); }
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public object SelectedElement { get {return(CurrentElement==Elements.ElementA) ElementA : ElementB; } }
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public object UnselectedElement { get {return(CurrentElement==Elements.ElementA) ElementB : ElementA; } } public void Switch() { if (CurrentElement == Elements.ElementA) CurrentElement = Elements.ElementB; else CurrentElement = Elements.ElementA; } } }
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We re afraid that this is going to be a fairly lengthy explanation, but we want to be thorough. First, our class, ABSwitcher, is going to be a type of ContentControl b. This will let the class be used like any other content control and will give us, among many other things, support for dependency properties. Our class has three dependency properties d: ElementA, ElementB, and CurrentElement. If these were regular properties, then we d define the properties, and be done. But, for dependency properties, there s somewhat more work. The benefit of using dependency properties, though, is that we get to participate in the dependency system, and our properties can be accessed from XAML. We start by creating static member variables that will be used to reference our dependency properties d, and then we initialize them inside a static constructor e that will only be called once at system startup. We re passing three arguments to the DependencyProperty.Register method the name of the property, the type of the property, and the type of the class that owns the property. We could also pass additional arguments here. For example, we could register a method that would be called whenever the property s value changes, but we don t need to do anything that fancy for the moment. The ElementA and ElementB properties are registered as type object we want to be flexible, and you can t get much more flexible than that. The CurrentElement property returns the value from an enum we defined earlier c. We could have used a Boolean value here because we re swapping between two things; but, trust us, the enum will make the code clearer, and will leave us some flexibility for later. We also have standard property accessors for our two elements f and for the CurrentElement value g. If you look at the implementation, you ll see that the get and set methods call GetValue and SetValue, passing our static DependencyProperty variables. These methods access the dictionary of properties for our object.
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A common mistake is for developers to assume that the property code (for example: ElementA, ElementB) will be called when properties are accessed. The Property System goes directly to the property dictionary without passing go or your breakpoints. The only time these accessors will be hit is if they re referenced by your code directly. If you want a guaranteed notification when a property is changed, you have to attach an event to the dependency property. For existing controls, a lot of common properties have a directly exposed event. For custom properties, you have to register a handler when you register the property (or modify the existing metadata). For an example of this, look in chapter 13.
The CurrentElement property is the one we ll use for our triggers later. When the current element changes, we ll activate our animation. The SelectedElement h and UnselectedElement i are there for convenience. When we update the lookup code, we ll want to make sure that we set our text on the element that is not currently visible (the UnselectedElement). This way, we keep the code for getting the proper element in our switcher, rather than having to put conditional statements all over the place. The Switch method j is likewise a convenient method for switching the CurrentElement from ElementA to ElementB. Well, that s pretty much all there is to creating our custom control. Now, we have to use it.
19.3.2 Using the transition control With the one caveat that we have to use a namespace reference, using our new control is just like using any other WPF control. The namespace reference is the same as the one we used in our main application window.
<UserControl x:Class="WorldBrowser.WorldListView" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:local="clr-namespace:WorldBrowser" xmlns:system="clr-namespace:System;assembly=mscorlib" Height="334" Width="551" Loaded="UserControl_Loaded">
Then we replace the content of the Grid with our control and two FlowDocumentReaders (listing 19.9).
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