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The next example is streamlined (by one character). The test syntax within the square brackets can determine if the variable is set without performing the -z, or zero-length, test. The test used in this example determines whether the variable has been set by using the logical NOT modifier (!). If the variable being tested does not have a value, the use of the test [ "$VAR" ] will evaluate as false since there was no value to be found. With the addition of the NOT modifier, the test will evaluate to true because the combination of two negatives (! and an unassigned variable) yields a positive outcome. The extra code, assigning the default value to the VAR variable following the AND operator (&&), is then executed as before.

A freshly installed Blend will default to Grid Layout mode. However, if your last project had a Layout mode of Canvas, your new projects will default to this.

The horizontal adjustment of the viewport used for native scrolling support. The type of shadow that is drawn around the viewport s child widget. The vertical adjustment of the viewport used for native scrolling support.

[ ! "$VAR" ] && VAR="some default"

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Figure 4-4. The main Grid in Grid Layout mode. Now you will see little lock icons appear where the blue Row and Column lines are. These little lock icons allow you to lock the height of a Row or the width of a Column; click one of the lock icons so that it turns to a locked State. If you look at the XAML code, you will see that the RowDefinitions and ColumnDefinitions still have Height and Width values with an asterisk after them. If the Row or Column s lock icon is not locked, these values can change depending on the size of the content that they display or by the size of the application window. If you lock one of the icons by clicking it, the asterisk disappears and the lock icon appears locked. Now, if the content dynamically changes or the size of the application window changes, the locked Column or Row will not change.

If set to TRUE, GTK+ will draw directly on the GtkWidget. If set to TRUE, the GtkWidget will be able to become the window s default widget. If set to TRUE, the GtkWidget will be able to accept the window s focus. If set to TRUE, the widget is not derived directly from GtkWidget. A bitmask of all of the events from GdkEventMask that the widget will receive. A bitmask of all extension events from GdkExtensionMode that the widget will receive. If set to TRUE, the GtkWidget is currently the default widget of its parent window. If set to TRUE, the GtkWidget is currently the widget with focus.

Now that you have Rows and Columns, what can you do with them Well, you can add controls into the Grid and then specify in the XAML what Row and Column they should be in. Here s how:

Now we simplify the code one final time. If the variable is set, the simpler test evaluates as true, and we want to perform the extra code only in the opposite case. Remember that when we use the logical OR syntax (||), the extra code is run only if the test is false. So we can streamline the code even more by using the simpler test and the OR operation.

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