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But, we wanted to demonstrate that the properties are fully bindable. When you run, you should now have a LinkLabel with the Manning website linked; when it s clicked, it should open your default web browser (figure 13.3).
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Figure 13.3 The rather ugly, but functional, test harness for the LinkLabel control is showing the happy path tooltip.
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If you change the URI to simply http:/ you can try the sad path tooltip as well (fig/, ure 13.4). That completes our UserControl, but there are some issues. First, we can use this control as is, but the XAML behind it is hardcoded. We can t apply our own template to the LinkLabel control because it effectively is the template. Also, although we can use this control in our test application project willy-nilly, it would be some- Figure 13.4 The sad path tells the user what s wrong with the URI for example, if the user what more useful if it were available to enters an invalid URI in a bookmark utility. other application projects as well. We can do that by using custom controls.
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13.2 Building custom controls
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Once you create new controls, you almost certainly want to make them reusable for other projects. After all, if you re only going to use them once, why even bother In this section, we re going to create a new control designed to be reused from a library. This new control will be a checked GroupBox. In the place where, on a regular GroupBox, there s a label, there will be a check box that enables and disables the content of the GroupBox (figure 13.5). As you ll see as we move forward, the way in which the control will be built will not only allow the text of the CheckBox and the content of the GroupBox to be changed easily but, via control templates, will even allow different controls to be used for the CheckBox and the GroupBox. If you went only by the names, it isn t entirely clear why you d use a CustomControl versus a UserControl. Technically, there s no class in WPF called CustomControl, although you can create a Custom Control Library. In the end, all controls are custom controls in that
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Figure 13.5 The checked GroupBox control automatically enables and disables the GroupBox content depending on the checked state of the CheckBox in the title.
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they re customized versions of some other control, whether that be a ControlTemplate as applied to an existing control, a new control derived from a UserControl, Control, TextBox, or even a FrameworkElement. When we talk about a custom control in WPF terms, we re referring to controls derived from the Control class. Many of the built-in controls in WPF derive from this class, so you re getting the same basic control that Microsoft uses, in most cases. The phrase is a bit overloaded, so all you really need to think about are the limitations and allowances that each of the specific classes give you. At the FrameworkElement class level, you have to do a significant amount of work yourself, but that also gives you tremendous flexibility. At the UserControl and ControlTemplate levels, you can put together existing pieces quickly, but you run into limits a lot sooner. Before we worry about building the control, let s create a Control Template Library so that we can reference it from multiple places.
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13.2.1 Building a control library Right-click the ControlsInAction solution, and select Add New Project. Select WPF Custom Control Library (as opposed to WPF User Control Library), and name this new project WpfInActionControls (figure 13.6). We should point out the following things about the project:
You don t get a designer. Yes, custom controls start with code. XAML is still involved, but we ll approach it differently. There s a Themes folder. In this folder is a file called generic.xaml, which we ll be getting to in a moment. The existence of this folder is highly related to the first point. There s no app.xaml. This is related to the first and second points. Maybe this was all one point after all
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