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Several variable-substitution types are similar to the := syntax in the previous example. Because the syntax for the different substitution types is almost identical and their meanings are so subtly different, they can be confused easily. Most of these substitutions would be used for substituting values of another variable into the code at the location of the substitution syntax, rather than for setting variables. The definitions for all of the following syntax types can be found in your shell man pages, but those explanations are often unclear. The rest of this chapter covers each substitution type with its syntax, some example code to set up the scenario, and an explanation of how the syntax works when making its comparison within the braces.

The next tool on the Blend 4 toolbar is the Asset Library Last Used tool. This is a handy little feature that will turn into the last control you have used from the Asset Library. Say, for example, you select the CheckBox tool from the Asset Library to create a check box. The Asset Library Last Used tool will turn into a CheckBox control. What is the Asset Library, you ask Find out in the next section.

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If set to TRUE, the user will be able to detach the tab from the parent notebook. The string to display for the tab in the notebook s tab selection menu. The current position of the child within the notebook, indexed from zero. If set to TRUE, the user will be able to change the position of the current tab. If set to TRUE, the child s tab will expand to fill extra space allocated to the notebook. If set to TRUE, the child s tab will fill extra space allocated to it. The string to display as the child s tab label. This can be left unset if you want to provide your own label widget. They type of packing that was used to add the child.

The next button you will find on the toolbar is a very handy one called the Asset Library. This is a collection of every control available to you in Silverlight (see Figure 2-26).

If set to TRUE, the child widget will be resized to fill the whole pane. If set to TRUE, the child s pane can be resized smaller than the requested size of the child widget.

For this substitution type we use the same := syntax that we used when we set a default variable in the previous example.

Figure 2-26. The last tool on the Blend toolbar is the Asset Library. This tool is great for a few reasons. First, it has a search feature that filters out the controls you see. For example, if you type B in the search field, all controls that have the letter B in them will appear. If you continue to type the word Button, all controls with the word Button in them will appear. Currently, there are seven controls with the word Button in them . . . I know that not because I am a genius, but because I tried the search I just mentioned while writing this chapter. Which brings up a good point: often we Silverlight developers forget the names of controls. When we do, the Asset Library is a great place to come to browse through them. The other reason this is a great tool is because if you make a custom UserControl (we do this in a later chapter), it will show up here under the Custom Controls tab. This makes it easy to implement the custom UserControl that you have made. But for now, you are just going to have to take my word for it, until you get to the custom UserControl tutorial in 12.

bottom-attach left-attach right-attach top-attach x-options (y-options) x-padding (y-padding)

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

The row that the bottom of the child widget is attached to. The column that the left side of the child widget is attached to. The column that the right side of the child widget is attached to. The row that the top of the child widget is attached to. Horizontal and vertical attach options provided for the widget. Horizontal and vertical padding to add on either side of the child widget.

There are so many controls in the Asset Library that it would be impractical and beyond the scope of this book to discuss them all. In fact, someone could write an entire book on all of these controls.

When the := comparison is encountered, the username variable is defined, but its value is null. As a result, this command uses the value of the LOGNAME variable for the echo command, and sets the value of username to the value of LOGNAME.

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