Simple .NET/ASP.NET PDF document editor web control SDK

binding_1.set_dataContext(checkBoxBoolean); binding_1.set_dataPath('checked'); binding_1.set_property('text'); binding_1.set_transformerArgument("Checkbox is {0}."); binding_1.set_direction(Web.BindingDirection.InOut); binding_1.transform.add(Web.Binding.Transformers.ToString); This is the same as how you set it up in the Atlas Script earlier, pointing the binding at the checkBoxBoolean control s checked property. This is then bound to the text property of this control. Note that the binding hasn t yet been associated with the text box, but this will happen shortly. The transformer argument is set up to create the text that will show in the text box after the binding occurs, as well as the direction type for the binding. The values for the binding direction are available in the Web.BindingDirection enumeration. Additionally, the transform Web.Binding.Transformers.ToString is applied. Other values for the transform are available in the Web.Binding.Transformers enumeration. To associate this binding with the text box, you need to call the get_bindings() method to get the collection of bindings associated with this control and call its add method, passing it this binding. You do that like this: textBox.get_bindings().add(binding_1); Another binding connects the checkboxes to each other. Again, this is a Web.Binding control, which supports methods that allow you to set the data context, data path, transform, and property to which to bind. You set it up like this: var binding_2 = new Web.Binding(); binding_2.set_dataContext(checkBoxBoolean); binding_2.set_dataPath('checked'); binding_2.set_property('checked'); binding_2.transform.add(Web.Binding.Transformers.Invert); checkBoxDisabled.get_bindings().add(binding_2); It is vitally important to then call the initialize() method on the controls after all the binding is set up to make sure it works correctly. Sometimes by habit you may initialize them directly after construction, but in this case you should wait until all of the bindings have been configured first: g_checkBoxBoolean.initialize(); g_checkBoxDisabled.initialize(); g_textBox.initialize();

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If you run the application by pressing F5, Visual Studio will show the Silverlight application in a web page, as you can see in Figure 20-1.

This simple Silverlight example contains a button, but if you click it, nothing will happen because we have not defined any behavior. Xaml files in WPF and Silverlight are usually paired with a so-called code behind file, a C# (or VB.NET, or whatever language you re using) file that contains code associated with the Xaml file, and we can use this to make the button do something. The easiest way to add a click handler for the button to your code behind is from the Xaml file. You can just double-click the button on the design view and it will add a click handler. In fact, most user interface elements offer a wide range of events, so you might want a bit more control. You could select the item on the design surface and then go to the Properties panel it has an Events tab that lists all the available events, and you can double-click on any of these to add a handler. Or if you prefer typing, you can add a handler from the Xaml source editor view. If you go to the Button element and start adding a new Click attribute, you ll find that when you type the opening quote

This limitation is controlled with the selectionBehavior and selectionMode properties of each view. Because it is controlled on a view level, it is important to remember that as soon as the selection model is shared between two views, both views need to have their selectionBehavior and selectionMode properties set up properly. The selection behavior can be set to SelectItems, SelectRows, or SelectColumns (which limits the selections to individual items, entire rows, or entire columns, respectively). The property does not limit how many items, rows, or columns the user can select; it is controlled with the selectionMode property. The selection mode can be set to the following values: NoSelection: The user cannot make selections in the view. SingleSelection: The user can select a single item, row, or column in the view. ContiguousSelection: The user can select multiple items, rows, or columns in the view. The selection area must be in one piece, next to each other without any gaps. ExtendedSelection: The user can select multiple items, rows, or columns in the view. The selection areas are independent and can have gaps. The user can choose items by clicking and dragging, selecting items while pressing the Shift or Ctrl keys. MultiSelection: Equivalent to ExtendedSelection from the programmer s viewpoint, the selection areas are independent and can have gaps. The user toggles the selected state by clicking the items. There is no need to use the Shift or Ctrl keys. In Listing 5-7, the table view is configured to allow only one entire row to be selected. Try selecting multiple items and single items by using the tree and list views. Listing 5-7. Changing the selection behavior table->setSelectionBehavior( QAbstractItemView::SelectRows ); table->setSelectionMode( QAbstractItemView::SingleSelection );

for the attribute value an IntelliSense pop up appears showing the text <New Event Handler> . If you press the Tab or Enter key, Visual Studio will fill in the attribute value with myButton_Click. No matter which way you add an event, Visual Studio populates the attribute by taking the first part from the element s name, as specified with the x:Name attribute, and adding the event name on the end:

<Button x:Name="myButton" HorizontalAlignment="Center" VerticalAlignment="Top" FontSize="20" Content="Click me!" Click="myButton_Click" />

It doesn t just edit the Xaml it also adds a method with this name to the code behind file. You can go to the code behind by pressing F7, or you can find it in the Solution Explorer if you expand a Xaml file node, you ll see a .xaml.cs file inside it, and that s the code behind. Example 20-2 shows the click handler, along with some additional code in bold. (You re not obligated to use this naming convention for handlers, by the way. You could rename it after Visual Studio creates the handler, as long as you change both the Xaml and the code behind.)