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As before, the variable has been defined, but its value is null. With this syntax the command will echo the statement, but there will be no output other than a carriage return because the username variable was defined even though it was null. Only if the username variable were totally undefined would the variable be set to the value of LOGNAME. This syntax could be useful in a login or cron script where you need to rely on certain variables being defined for the script to function. If a specific environment variable hasn t been defined, you can assign it to the value your script requires.

Grid.Column and Grid.Row so that your code looks like this: <TextBlock Margin="23,37,21,51" Text="Row 0 Column 0" TextWrapping="Wrap" Grid.Column="0" Grid.Row="0"/> <TextBlock Margin="23,37,21,51" Text="Row 0 Column 1" TextWrapping="Wrap" Grid.Column="1" Grid.Row="0"/> <TextBlock Margin="23,37,21,51" Text="Row 1 Column 0" TextWrapping="Wrap" Grid.Column="0" Grid.Row="1"/> <TextBlock Margin="23,37,21,51" Text="Row 1 Column 1" TextWrapping="Wrap" Grid.Column="1" Grid.Row="1"/>

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An input device, such as a pen on a touch screen, has broken off contact with a sensing surface. The mouse pointer entered the widget while a drag action was in progress. The mouse pointer left the widget while a drag action was in progress. The mouse pointer moved within the widget while a drag action was in progress. The current status of a drag action was changed. A drop action on the widget began. A drop action on the widget completed. An event for the widget was received from another application. The visibility of the widget changed. For example, some portion of it has been covered or uncovered. The source region was completely available when parts of a drawable area were copied. The widget has been scrolled in one direction or another. This allows you to update the widget s visible area. The state of the widget has changed. If the widget is a top-level window, this can happen when it is minimized, maximized, made sticky, made into an icon, and so forth. A setting was added, removed, or modified for the widget.

their correct Rows and Columns. Your project should look like Figure 4-5.

In this command, the value of the LOGNAME variable will be used for the echo statement because username is null even though it is defined:

The owner of the widget has changed. This event was introduced in GTK+ 2.6. The widget was grabbed by the pointer or the keyboard, but it was broken. This can happen when the window becomes invisible or when a user attempts to repeat a grab. This event was introduced in GTK+ 2.8.

Figure 4-5. TextBlocks in different Grid Rows and Columns. Another interesting thing about the Grid is that it positions its content using margins. Basically, margins determine distance from the boundaries of the Grid, or the boundaries of the Grid cell if the element is inside a Grid cell. Say, for example, you have a Rectangle control inside a Grid, and its VerticalAlignment is set to Top and its HorizontalAlignment is set to Left. If you give the Rectangle control a Margin property of "10,10,0,0", the Rectangle will be 10 pixels from the left and 10 pixels from the top, as the values for Margin set the left, top, right, and bottom distances in that order. Conversely, if you set the Rectangle s HorizontalAlignment to Right, and its VerticalAlignment to Bottom, and then give it a Margin property of "0,0,10,10", the Rectangle control will be 10 pixels from the right and 10 pixels from the bottom.

Tables B-2 through B-69 provide a complete list of signals for each class in GTK+ that has signals. In addition to signal names, a description is provided for each item. If the signal does not follow the standard signal prototype, the additional parameters are listed; these additional parameters do not include the object itself and the user data pointer. Table B-2. GtkAction Signals

username="" echo "${username:-$LOGNAME}"

The next layout element I want to talk about is the Canvas. This is one of my personal favorites because it allows the user to specify absolute positioning of its children. The Canvas will never change the position of child elements in it, and I find this very useful. To see how the Canvas works, you have to make some changes to the project:

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