Unix

GTK+ Gnome Application Development by Havoc Pennington

By Havoc Pennington

This identify is for the reader who's conversant with the c language and UNIX/Linux improvement. It presents distinct and solution-oriented details designed to fulfill the desires of programmers and alertness builders utilizing the GTK+/Gnome libraries. assurance enhances current GTK+/Gnome documentation, going into extra intensity on pivotal concerns equivalent to uncovering the GTK+ item method, operating with the development loop, dealing with the Gdk substrate, writing customized widgets, and mstering GnomeCanvas.

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H> 34 Chapter 2. glib: Portability and Utility g_new(type, count); g_new0(type, count); g_renew(type, mem, count); Figure 2-6. Allocation macros String Handling glib provides a number of functions for string handling; some are unique to glib, and some solve portability concerns. They all interoperate nicely with the glib memory allocation routines. For those interested in a better string than gchar*, there’s also a GString type. org/. ); gint g_strcasecmp(const gchar* s1, const gchar* s2); gint g_strncasecmp(const gchar* s1, const gchar* s2, guint n); Figure 2-7.

The box-wide spacing setting determines how much blank space to leave between children; so this value is multiplied by the number of chilren minus one, and added to the base size request. Note that spacing does not belong to a child; it is blank space between children and is unaffected by the expand and fill parameters. Padding, on the other hand, is the space around each child and is affected by the child’s packing parameters. 5. All containers have a "border width" setting; two times the border width is added to the request, representing a border on either side.

If no child can expand, the extra is used to add more space in the center of the box, between the start-packed widgets and the end-packed widgets. 3. If the box is homogeneous, the extra is distributed according to need; those children who requested more space get less extra, so that everyone ends up with the same amount of space. The expand parameter is ignored for homogeneous boxes—extra is distributed to all children, not just the expandable ones. 4. When a child gets some extra space, there are two possibilities.

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