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Drawer ECC200 in Font CONTAINER WIDGETS

CHAPTER 3 CONTAINER WIDGETS
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Figure 3-2 shows the graphical output of Listing 3-2. Since we packed each of the widgets starting at the end, they are shown in reverse order. The packing began at the end of the box and packed each child before the previous one. You are free to intersperse calls to start and end packing functions. GTK+ keeps track of both reference positions.
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Figure 3-2. A vertical box packed from the end position If you do not want to use the default values for expanding, filling, and spacing, you can use gtk_box_pack_end() or gtk_box_pack_start() to specify different values for each packing property. By setting the expand property to TRUE, the cell will expand so that it takes up additional space allocated to the box that is not needed by the widgets. By setting the fill property to TRUE, the widget itself will expand to fill extra space available to the cell. Table 3-1 offers a brief description of all possible combinations of the expand and fill properties. Table 3-1. expand and fill Properties
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TRUE TRUE FALSE FALSE
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The cell will expand so that it takes up additional space allocated to the box, and the child widget will expand to fill that space. The cell will expand so that it takes up additional space, but the widget will not expand. Instead, the extra space will be empty. Neither the cell nor the widget will expand to fill extra space. This is the same thing as setting both properties to FALSE. Neither the cell nor the widget will expand to fill extra space. If you resize the window, the cell will not resize itself.
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In the previous gtk_box_pack_end() call, each cell is told to place five pixels of spacing between itself and any neighbor cells. Also, according to Table 3-1, neither the cell nor its child widget will expand to take up additional space provided to the box.
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CHAPTER 3 CONTAINER WIDGETS
void gtk_box_pack_end (GtkBox *box, GtkWidget *child, gboolean expand, gboolean fill, guint padding);
Note If you have experience programming with other graphical toolkits, the size negotiation system provided by GTK+ may seem odd. However, you will quickly learn its benefits. GTK+ automatically takes care of resizing everything if you change a user interface, instead of requiring you to reposition everything programmatically. You will come to view this as a great benefit as you continue learning GTK+.
While you should try to finalize the order of elements in a GtkBox widget before displaying it to the user, it is possible to reorder child widgets in a box with gtk_box_reorder_child(). void gtk_box_reorder_child (GtkBox *box, GtkWidget *child, gint position); By using this function, you can move a child widget to a new position in the GtkBox. The position of the first widget in a GtkBox container is indexed from zero. The widget will be placed in the last position of the box if you specify a position value of -1 or a value greater than the number of children.
Horizontal and Vertical Panes
GtkPaned is a special type of container widget that holds exactly two widgets. A resize bar is placed between them, which allows the user to resize the two widgets by dragging the bar in one direction or the other. When the bar is moved, either by user interaction or programmatic calls, one of the two widgets will shrink while the other expands. There are two types of paned widgets: GtkHPaned for horizontal resizing and GtkVPaned for vertical resizing. As with boxes, the horizontal and vertical pane classes only provide functions to create the widget. All other functionality is defined in the common parent class, GtkPaned. Listing 3-3 shows a simple example where two GtkButton widgets are placed as the children of a horizontal pane.
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