procyberian/emacs
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions

(frames-on-display-list, framep-on-display): New functions.

Browse source 
(display-mouse-p, display-popup-menus-p, display-graphic-p)
(display-selections-p, display-screens, display-pixel-width)
(display-pixel-height, display-mm-width, display-mm-height)
(display-backing-store, display-save-under, display-planes)
(display-color-cells, display-visual-class): New functions.
This commit is contained in:
Eli Zaretskii 2000-02-02 11:35:43 +00:00
parent 26b09289ed
commit 9911648b58
1 changed files with 172 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

172
lisp/frame.el
View file

@ -508,6 +508,27 @@ on `after-make-frame-functions' are run with one arg, the newly created frame."
(function (lambda (frame)
(eq frame (window-frame (minibuffer-window frame)))))))
(defun frames-on-display-list (&optional display)
"Return a list of all frames on DISPLAY.
DISPLAY is a name of a display, a string of the form HOST:SERVER.SCREEN.
If DISPLAY is omitted or nil, it defaults to the selected frame's display."
(let* ((display (or display
(cdr (assoc 'display (frame-parameters)))))
(func
(function (lambda (frame)
(eq (cdr (assoc 'display (frame-parameters frame)))
display)))))
(filtered-frame-list func)))
(defun framep-on-display (&optional display)
"Return the type of frames on DISPLAY.
DISPLAY may be a display name or a frame. If it is a frame, its type is
returned.
If DISPLAY is omitted or nil, it defaults to the selected frame's display.
All frames on a given display are of the same type."
(or (framep display)
(framep (car (frames-on-display-list display)))))
(defun frame-remove-geometry-params (param-list)
"Return the parameter list PARAM-LIST, but with geometry specs removed.
This deletes all bindings in PARAM-LIST for `top', `left', `width',
@ -768,6 +789,157 @@ one frame, otherwise the name is displayed on the frame's caption bar."
(modify-frame-parameters (selected-frame)
(list (cons 'name name))))
;;;; Frame/display capabilities.
(defun display-mouse-p (&optional display)
"Return non-nil if DISPLAY has a mouse available.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
(let ((frame-type (framep-on-display display)))
(cond
((eq frame-type 'pc)
(msdos-mouse-p))
((eq system-type 'windows-nt)
(> w32-num-mouse-buttons 0))
((memq frame-type '(x mac))
t) ;; We assume X and Mac *always* have a pointing device
(t
(featurep 'xt-mouse)))))
(defun display-popup-menus-p (&optional display)
"Return non-nil if popup menus are supported on DISPLAY.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display).
Support for popup menus requires that the mouse be available."
(and
(let ((frame-type (framep-on-display display)))
(memq frame-type '(x w32 pc mac)))
(display-mouse-p display)))
(defun display-graphic-p (&optional display)
"Return non-nil if DISPLAY is a graphic display.
Graphical displays are those which are capable of displaying several
frames and several different fonts at once. This is true for displays
that use a window system such as X, and false for text-only terminals.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
(not (null (memq (framep-on-display display) '(x w32 mac)))))
(defun display-selections-p (&optional display)
"Return non-nil if DISPLAY supports selections.
A selection is a way to transfer text or other data between programs
via special system buffers called `selection' or `cut buffer' or
`clipboard'.
DISPLAY can be a display name, a frame, or nil (meaning the selected
frame's display)."
(let ((frame-type (framep-on-display display)))
(cond
((eq frame-type 'pc)
;; MS-DOG frames support selections when Emacs runs inside
;; the Windows' DOS Box.
(not (null dos-windows-version)))
((memq frame-type '(x w32 mac))
t) ;; FIXME?
(t
nil))))
(defun display-screens (&optional display)
"Return the number of screens associated with DISPLAY."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32))
(x-display-screens display))
(t ;; FIXME: is this correct for the Mac?
1))))
(defun display-pixel-height (&optional display)
"Return the height of DISPLAY's screen in pixels.
For character terminals, each character counts as a single pixel."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-pixel-height display))
(t
(frame-height (if (framep display) display (selected-frame)))))))
(defun display-pixel-width (&optional display)
"Return the width of DISPLAY's screen in pixels.
For character terminals, each character counts as a single pixel."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-pixel-width display))
(t
(frame-width (if (framep display) display (selected-frame)))))))
(defun display-mm-height (&optional display)
"Return the height of DISPLAY's screen in millimeters.
If the information is unavailable, value is nil."
(and (memq (framep-on-display display) '(x w32 mac))
(x-display-mm-height display)))
(defun display-mm-width (&optional display)
"Return the width of DISPLAY's screen in millimeters.
If the information is unavailable, value is nil."
(and (memq (framep-on-display display) '(x w32 mac))
(x-display-mm-width display)))
(defun display-backing-store (&optional display)
"Return the backing store capability of DISPLAY's screen.
The value may be `always', `when-mapped', `not-useful', or nil if
the question is inapplicable to a certain kind of display."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-backing-store display))
(t
'not-useful))))
(defun display-save-under (&optional display)
"Return non-nil if DISPLAY's screen supports the SaveUnder feature."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-save-under display))
(t
'not-useful))))
(defun display-planes (&optional display)
"Return the number of planes supported by DISPLAY."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-planes display))
((eq frame-type 'pc)
4)
(t
(truncate (log (length (tty-color-alist)) 2))))))
(defun display-color-cells (&optional display)
"Return the number of color cells supported by DISPLAY."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-color-cells display))
((eq frame-type 'pc)
16)
(t
(length (tty-color-alist))))))
(defun display-visual-class (&optional display)
"Returns the visual class of DISPLAY.
The value is one of the symbols `static-gray', `gray-scale',
`static-color', `pseudo-color', `true-color', or `direct-color'."
(let ((frame-type (framep-on-display display)))
(cond
((memq frame-type '(x w32 mac))
(x-display-visual-class display))
((and (memq frame-type '(pc t))
(tty-display-color-p display))
'static-color)
(t
'static-gray))))
;;;; Aliases for backward compatibility with Emacs 18.
(defalias 'screen-height 'frame-height)
(defalias 'screen-width 'frame-width)