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/* Graphics contexts that hold drawing properties for each color and state. */ GdkGC *fg_gc [5], *bg_gc [5], *light_gc[5], *dark_gc[5], *mid_gc[5], *text_gc[5], *base_gc[5], *text_aa_gc[5]; GdkGC *black_gc, *white_gc; } GtkStyle; There are many objects in the GtkStyle structure. Each of these will have a default value set by the user s style, so overriding them may not always be a good idea. However, if it is necessary, editing a widget s GtkStyle is a simple way to change how it is displayed. You will notice that many of the style properties are arrays of file elements. This is because each of these elements can have different values for one of the following five possible widget states: GTK_STATE_NORMAL: The widget during normal operation. GTK_STATE_ACTIVE: An active widget, such as when a toggle is depressed. GTK_STATE_PRELIGHT: A widget when the mouse pointer is over the widget; it will respond to button clicks. GTK_STATE_SELECTED: A widget when the widget or its text has been selected. GTK_STATE_INSENSITIVE: A widget is deactivated and will not respond to the user.

Error checking is an important part of all types of coding Not only do you need to get the commands, logic, and functionality of the program correct along the desired path of execution, you should also check for problem conditions along the way Anticipating potential problems will make your code more robust and resilient The function that is included here is called alert since it notifies you of any issues A function is something like a mini-program within the main code, and it can be called like any other regular command A good use for a function is to reduce duplication of code if you re going to perform a given task many times throughout the script The alert function, like all others, needs to be included in the code (that is, defined) prior to it being called by the script.

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5. Change the color from white to another color. You can do this a few different ways:

Tip If you need to get a tree iterator and only have the path string available, you can convert the string into

a GtkTreePath and then to a GtkTreeIter. However, a better solution would be to skip the intermediate step with gtk_tree_model_get_iter_from_string(), which converts a tree path string directly into a tree iterator.

You can just click the color palette, and the color will change to whatever color you click (number 1 in Figure 2-31). You can adjust the RGBA values individually (number 2 in Figure 2-31). You can change the color by setting the hexadecimal value (number 3 in Figure 2-31). You can change the color value by using the Eyedropper (number 4 in Figure 231). The Eyedropper will pick up any color that is underneath it. This goes for your workspace or the Blend application as well. You can change the color by making use of a color resource (number 5 in Figure 2-31). You will create a color resource and apply it to another object a little later in this section.

Once the function has been defined, it should be called following any critical commands By critical, I mean those that are most important to the success of the script For instance, if you have a script that does some file manipulation (such as finding files that match certain criteria and moving them around or modifying them), there will be plenty of lines of code, but the key commands might.

In addition to gtk_tree_path_up(), there are other functions that allow you to navigate throughout a tree model. You can use gtk_tree_path_down() to move to the child row and gtk_tree_path_next() or gtk_tree_path_prev() to move to the next or previous row in the same level. When you move to the previous row or parent row, FALSE will be returned if it was not successful. At times, you may need to have a tree path as a list of integers instead of a string. The gtk_tree_path_get_indices() function will return the integers that compose the path string. gint* gtk_tree_path_get_indices (GtkTreePath *path); Problems can arise with tree paths when a row is added or removed from the tree model. The path could end up pointing to a different row within the tree or, worse, a row that does not exist anymore! For example, if a tree path points to the last element of a tree and you remove that row, it will now point beyond the limits of the tree. To get around this problem, you can convert the tree path into a tree row reference.

Figure 2-31. Numbers 1 through 5 indicate the different ways you can change the solid fill of an object. You can also choose a gradient for your object by selecting the Gradient brush option. Change your Rectangle's fill to a gradient now by clicking the Gradient brush icon, as I am doing in Figure 2-32. Now let s take a look at gradients in a little more detail.

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