And hug it, and pet it, and call the namespace xmlns:George . in C#.NET

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new PropertyChangedCallback(OnIsContentEnabledChanged))); public bool IsContentEnabled { get { return (bool)GetValue(IsContentEnabledProperty); } set { SetValue(IsContentEnabledProperty, value); } } }
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And now, to set up the control logic for the callback, add the method from listing 13.3.
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Listing 13.3 OnIsContentEnabledChanged event handler
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private static void OnIsContentEnabledChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e) { Who sets this bool enabled = (bool)e.NewValue; ConditionalGroupBox groupBox = (ConditionalGroupBox)sender;
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UIElement content = groupBox.Content as UIElement; if (content != null) content.IsEnabled = enabled; }
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Only needed on one element
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This method will be called when the IsContentEnabled property s value changes. We don t yet know who is setting that property, but we also don t care. We get the value from IsContentEnabled b from the passed arguments, and then use that value to enable or disable the content of our control c although, again, we don t know what type of control it is. The nice thing is that we only have to enable or disable the main control and all the children in the visual tree will automatically be enabled or disabled. The control is done! Well, sort of. This is where templating comes in. The control itself is technically done we could use it in an application, but the application developer would have to write the control s template. That isn t very nice. But, we can provide a simple default template for the control through Generic.xaml.
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13.2.3 Create the default template for the control We ve made much of the fact that all (or most) controls in WPF are lookless that is, their look-and-feel isn t tied to the control, and so can be completely customized via control templates. But, when you drag a Button (for example) onto a form, it obviously has a look, or you wouldn t see anything. In fact, it has a fairly elaborate style that draws the button, makes it change when the mouse moves over, and so on. The reason for this is that Button (and all the other controls) has a default control template that defines the way it should look. We ll do the same thing with our control. For our default template, we ll put a CheckBox in the header (our conditional control) and use a GroupBox for the, uh, GroupBox. Open the Themes folder and the file Generic.xaml. You ll find that Visual Studio has helpfully started your template for you. It creates a border element and binds it to the parent control s Background, BorderBrush, and BorderThickness properties. We need to create the default template for this control, and we re going to have to do it
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Building custom controls
without any help from a visual designer because it can t currently handle templates. Listing 13.4 shows what the final style should look like.
Listing 13.4 The ConditionalGroupBox style from Generic.xaml
<Style TargetType="{x:Type local:ConditionalGroupBox}"> Assigns template <Setter Property="Template"> to new control <Setter.Value> <ControlTemplate TargetType="{x:Type local:ConditionalGroupBox}"> <Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}"> <GroupBox> GroupBox to CheckBox to enable/ <GroupBox.Header> outline controls disable controls <CheckBox IsChecked= "{Binding RelativeSource={RelativeSource TemplatedParent}, Path=IsContentEnabled}" Creates ControlTemplate Content= "{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Header}"/> </GroupBox.Header> <ContentPresenter Content="{TemplateBinding Content}" /> </GroupBox> Directs content to be </Border> within GroupBox </ControlTemplate> </Setter.Value> </Setter> </Style>
As with any other template, we re associating this template b to our control. We d have at least one style entry for each control in this project. We re using a Setter to set the Template property c on any newly created instances of ConditionalGroupBox to our ControlTemplate definition d. Visual Studio gave us a nice little Border for free e, so we re keeping it (but we don t have to). Our template really begins with the definition of the GroupBox f. A GroupBox is a header control; it has header content as well as general content the stuff in the GroupBox itself. We ve put a CheckBox into the header g. This is where we wire up the behavior that makes everything work. The IsChecked property of the CheckBox is bound to our custom control s IsContentEnabled dependency property. When the check state changes, it will automatically update the property, causing our event handler to be called. We re also binding the Content of the CheckBox to the Header property of our control. This property is inherited from HeaderedContentControl. When someone uses our control, he can set its header, and whatever he sets it to will appear next to the check box. Finally, we bind the Content h specified on the control (also inherited from HeaderedContentControl) to present in the GroupBox using a ContentPresenter. Now we can truly say the control is finished.
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