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It s tempting to think of def variables only as constants; indeed that s how they re often used, but it s not always the case. A def variable cannot be reassigned, but the object it references can mutate (change its contents). Some types of objects are immutable (they provide no way to change their content once created, examples being String and Integer), so we might assume a def variable of an immutable type must be a constant. But again, this is not always the case. In a later section we ll investigate bound variables, revisiting def to see how a variable (even of an immutable type) can change its value without actually changing its content. So, ignoring bound variables for the moment, a valid question is when should we use var and when should we use def First, def is useful if we want to drop hints to fellow programmers as to how a given variable should be used. Second, the compiler can detect misuse of a variable if it knows how we intend to use it, but crucially, JFX can better optimize our software if given extra information about the data it s working with. For simple assignments like those in listing 2.5, it s largely a matter of choice or style. Using def helps make our intentions clear and means our code might run a shade faster.

In the Data Flow toolbox, navigate to the Data Flow Destinations grouping of objects, and then drag the OLE DB Destination object onto the Data Flow design surface.

ProductNameTextBox.DataBindings.Add("Text", productsBindingSource, "ProductName")

Connect the output of the Aggregate Transformation to the new OLE DB Destination object by dragging the output arrow from the Aggregate Transformation onto the OLE DB Destination adapter. Right-click the OLE DB Destination adapter, and then click Edit to display the OLE DB Destination Adapter Editor dialog box.

Arithmetic on value types (+, -, etc.) Waxing lyrical about JavaFX Script s arithmetic capabilities is pointless: they re basically the same as those of most programming languages. Unlike Java, JavaFX Script s value types are objects, so they respond to both conventional operator syntax (like Java primitives) and method calls (like Java objects). Let s see how that works in practice, in listing 2.6.

private BindingSource productsBindingSource;

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a. In the OLE DB Destination Adapter Editor dialog box, verify that the OLE DB Con-

In the Create Table dialog box, change the name of the new table to sales_summary. The CREATE TABLE code listed in the window should look like the following:

private void Form1_Load(object sender, EventArgs e) { // Load the products table with data productsTableAdapter1.Fill(northwindDataSet1.Products); // Create a BindingSource to the Products table

Note how the final progress bar also assigns its own local style for the boxSetStroke This is important, as we ll see in a short while. Figure 7.16 shows the progress control on screen. All three Progress bars are bound to the variable val, which the Timeline at the foot of the code repeatedly increases and decreases (with a slight pause at either Figure 7.16 Three examples end), to make the bars shoot up and down from miniof our progress bar in action mum to maximum. The key part of the code lies in the stylesheets property of Scene. This is where we plug in our list of CSS documents (just one in our example) using their URLs. This particular example expects our docs to sit next to the TestCSS bytecode files. The __DIR__ built-in variable returns the directory of the current class file as a URL, as you recall. If you downloaded the project s source code, you ll find the CSS file nested inside the res directory, off the project s root. When you build the project, make sure this file gets copied into the build directory, next to the TestCSS class file. Now it s time for the grand unveiling of the CSS file that styles our component. Listing 7.14 shows the three style rules we ve created for our test program. (Remember, it lives inside jfxia.chapter7, next to the TestCSS class.)

CREATE TABLE [Sales_Summary] ( [OrderDate] DATETIME, [SubTotal] NUMERIC (38,6), [ProductLine] NVARCHAR(2) ) ON [PRIMARY]

productsBindingSource = new BindingSource(northwindDataSet1, "Products");

d. Click OK in the Create Table dialog box. e. On the Mappings tab of the OLE Destination Editor dialog box, ensure that the

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