|Allegro CL version 8.2|
Minimal update since 8.2 release.
Arguments: name &rest arguments &key (class (quote frame-window)) (owner (development-main-window *system*)) dialog-items form-p child-name behind state &allow-other-keys
Creates and returns a new window, or returns
nil if the request to the Operating System to create
a new window fails (see the information under the heading
nil if a window cannot be created near the
bottom of this page).
The name argument should be a symbol (we recommend using keywords) which does not name any other object. The name can be passed as an argument to find-window and other find- functions to get a programmatic handle on a window.
When using the Integrated Development Environment, you can design
windows to be used in your application using forms. A
form is a class of
window that is used to design windows of other classes. The Integrated
Development Environment creates a function from a form you have
designed which creates the designed window. Get a new form by clicking
New Form. You are asked for the class of the window (the
value of the :class argument) and that is the type of window that
will be designed with the form.
Here are some keyword arguments to make-window:
frame-window. The class of the window being created. The standard choices besides
non-refreshing-window. We recommend that you subclass these standard classes so your customizations will not affect existing windows. In earlier releases, this argument was named device and that name is still accepted. Do not, of course, specify both.
The accessor/setter of the
class property is device, though it is
uncommon to need to use that function programmatically (one typically
sets this slot upon creation or using the
slot in an inspector window).
object)) also serves as an accessor.
(development-main-window *system*), which is the invisible IDE owner window when the IDE is present, and otherwise the screen. See development-main-window.
A window shrinks or closes whenever its owner window does. If the child-p argument is true, then the owner will also be the parent of the new window. A window moves along with its parent, and is clipped at the interior edge of the parent. In earlier releases, this argument was named parent and that name is still accepted. Do not, of course, specify both.
t. A boolean value indicating whether the new window will be a child window. If non-nil and the owner is a window rather than the screen, then the new window will be a child window and the owner window will also be its parent. A child window moves along with its parent and is clipped at the parent's interior border. If
nilor the owner is the screen, then the new window will float freely about on the screen, but will still shrink and close along with its owner (if the owner is a window). The parent of a non-child window is the screen.
GTK note: On X platforms, we strongly discourage specifying
non-child owned windows are often not handled well. A typical window
manager will add a separate taskbar item (and alt-tab item) for each
non-child window, and will allow the user to move other applications
between an owned window and its owner window in the occlusion stack.
Common Graphics may also not be allowed to move the keyboard focus to
a different top-level window programmatically.
nil. The value should be a list of controls (also called widgets, whence the former argument name) to be placed on the window. While controls can be placed on any window, only windows of type
dialog-mixin(that is, only windows whose class is a subclass of
dialog-mixin) will have the special Windows dialog behavior. In such windows, pressing the TAB key moves the keyboard focus from one control to another and pressing Alt-[letter] will move the keyboard focus to the control that has the letter underlined as its access character. (For example, pressing Alt-A will move keyboard focus to the control whose access letter is an underlined A.)
Each widget in the list is created by calling make-instance on a subclass of
the list of all widget
classes in cgide.htm. Each widget
instance can be used on only a single parent window.
The use of :widgets to name this argument is deprecated. :dialog-items should be used instead. :widgets is accepted and both should not be specified.
nil. See pop-up. This argument should be specified true if the window is intended to be modal. Note that the value of this property cannot be changed once the window has been created.
frame-with-single-childmixin (such as
bitmap-window), the :child-name argument may be passed to make-window to provide a name for the child pane that is created automatically for the frame window. As with other object names that are used in Allegro CL for finding objects, the name should be a symbol.
In fact it is unlikely that this name will be needed programmatically, since the child-pane can be found by calling frame-child on the parent frame window, it is nevertheless often helpful for arbitrary objects to have names so that the they can be recognized more easily during debugging.
nil, which places the window in front or its siblings. A value of
tplaces the window behind all of its siblings. If the value is another window that is already on the owner window, the new window is placed immediately behind the specified window.
When creating a window, the window is placed into its initial visible state (as specified by the :state initarg) by a device-open :around method. This means that if an application adds device-open methods (including :after methods) for its window subclasses, for example to set up child windows on the window, the main window will be shown only after this setup is complete, to avoid distracting the user and to increase creation speed. (An alternate approach is simply to create the main window in :shrunk state, then do arbitrary setup, and then set the state of the main window to :normal.)
GTK Note: For a top-level window on the GTK platforms (Linux and Mac), you probably should always pass the interior argument rather than this argument or any of the others that apply to the exterior. The reason is that X11 makes it difficult or impossible (depending on the particular X server) to control the placement of the window manager frame of a top-level window, or even to determine its thickness. To make a cross-platform application work the same on Windows, the interior argument can be used universally. Child windows do not have this problem.
nil(the default), then no centering is done. If
:on-parent, then the window will be centered over its parent. For any other true value, the window will be centered over its owner. If an exterior or interior argument is passed along with a true centered argument, then the exterior or interior box will determine the size of the window while the centering will determine its position. A true centered argument would override an exterior-top-left argument. See also center-window and the centered property.
nilby default for backward compatibility and because it uses memory resources, but it is generally recommended to pass this initarg as true for any window on which an application draws. See double-buffered.
There are many other options (specified by initarg (a keyword)/value pairs) to make-window. In general, the initargs are keywords with the same name as properties, :left-attachment for left-attachment, e.g.)
nil if the operating system fails to
make the requested window. Such failure is typically due to one of the
operating system's tables for all windows and menus becoming full.
This situation should be rare, but if it does happen, your application
should be modified to close any windows or menus that are no longer
being used, in order to free up the corresponding operating system
resources. Windows may be closed programmatically by calling close on them.
Copyright (c) 1998-2016, Franz Inc. Oakland, CA., USA. All rights reserved.
This page has had moderate revisions compared to the 8.1 page.
|Allegro CL version 8.2|
Minimal update since 8.2 release.