The default view in the Interface Builder is the layouts view, as shown in Displaying the layouts in the Interface Builder. You use this view to specify the entire GUI, with the exception of the menus. Click the Layouts tab to swap to this view from any other in the Interface Builder.
Figure 20.4 Displaying the layouts in the Interface Builder
The Interface Builder has three sections in the layouts view.
The interface text box displays the name of the current interface; the interface that you are currently working on. Note that there may be several other interfaces loaded into the Interface Builder, but only one can be current.
To switch to another loaded interface, or to create a new interface, type the name of the interface into this area and press
Return. You might find it useful to type just a few characters and then press
Down to invoke in-place completion. The interface you specify appears and its layouts are shown in the Interface Builder.
By default, the graph is laid out from left to right. The main interface name is shown at the extreme left, and the layouts and elements defined for that interface are shown to the right. The hierarchy of the layouts (that is, which elements are contained in which layouts, and so on) is immediately apparent in the graph.
An item selected in the graph can be operated on by commands in the Object menu in the Interface Builder's menu bar. This menu contains the standard action commands described in Performing operations on selected objects, as well as a number of other commands described throughout this chapter.
The precise list of items available depends on the package of the current interface. To change this package, choose Interface > Package... and specify a package name in the dialog that appears. You must specify a package which already exists in the Lisp image.
The package of the current interface is not necessarily the same as the current package of the Interface Builder. Like all other tools, the Interface Builder has its own current package, which affects the display of symbol names throughout the tool; see Specifying a package for details. By contrast, the package of the current interface is the package in which the interface is actually defined. The window elements which are available for the current interface depend on the visibility of symbols in that package. By default, both the package of the current interface and the current package of the Interface Builder are set to
CL-USER by default.
An element chosen from any of these areas can be operated on by commands in the Object menu. This menu contains the standard action commands described in Performing operations on selected objects.
To add a new element to the layout, click the relevant button in any of the tabs in the button panel. The element is added as the child of the currently selected graph node. If nothing is currently selected, the element is added as the child of the last selected node.
For instance, the first element to add to an interface is likely to be a CAPI layout element, such as an instance of the
row-layout class or
column-layout class. Not surprisingly, these types of element can be found in the Layouts tab of the button panel. Elements such as buttons or panes (or other layouts) are then added to this layout. In order to generate CAPI interfaces, it is important to understand that all window elements must be arranged inside a layout element in this way.
When you add an item, an instance of that class is created. By default, the values of certain attributes are set so that the element can be displayed and the hierarchy layout updated in a sensible way. This typically means that name and title attributes are initialized with the name of the element that has been added, together with a numeric suffix. For instance, the first output pane that is added to an interface is called
Output-Pane-1. You should normally change these attribute values to something more sensible, as well as set the values of other attributes. See Performing operations on objects for details about this.
For a practical introduction to the process of creating an interface using the Interface Builder, see Example: Using The Interface Builder.
LispWorks IDE User Guide (Unix version) - 12 Feb 2015