These functions let you read and change the parameter values of a frame.
This function returns the value of the parameter parameter (a
symbol) of frame. If frame is nil
, it returns the
selected frame’s parameter. If frame has no setting for
parameter, this function returns nil
.
The function frame-parameters
returns an alist listing all the
parameters of frame and their values. If frame is
nil
or omitted, this returns the selected frame’s parameters
This function alters the frame frame based on the elements of
alist. Each element of alist has the form
(parm . value)
, where parm is a symbol naming
a parameter. If you don’t mention a parameter in alist, its
value doesn’t change. If frame is nil
, it defaults to
the selected frame.
Some parameters are only meaningful for frames on certain kinds of display (see Frames). If alist includes parameters that are not meaningful for the frame’s display, this function will change its value in the frame’s parameter list, but will otherwise ignore it.
When alist specifies more than one parameter whose value can affect the new size of frame, the final size of the frame may differ according to the toolkit used. For example, specifying that a frame should from now on have a menu and/or tool bar instead of none and simultaneously specifying the new height of the frame will inevitably lead to a recalculation of the frame’s height. Conceptually, in such case, this function will try to have the explicit height specification prevail. It cannot be excluded, however, that the addition (or removal) of the menu or tool bar, when eventually performed by the toolkit, will defeat this intention.
Sometimes, binding frame-inhibit-implied-resize
(see Implied Frame Resizing) to a non-nil
value around calls to this function
may fix the problem sketched here. Sometimes, however, exactly such
binding may be hit by the problem.
This function sets the frame parameter parm to the specified
value. If frame is nil
, it defaults to the selected
frame.
This function alters the frame parameters of all existing frames
according to alist, then modifies default-frame-alist
(and, if necessary, initial-frame-alist
) to apply the same
parameter values to frames that will be created henceforth.