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241 lines
8.8 KiB
EmacsLisp
241 lines
8.8 KiB
EmacsLisp
;;; mldrag.el --- mode line and vertical line dragging to resize windows
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;; Copyright (C) 1994 Free Software Foundation, Inc.
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;; Author: Kyle E. Jones <kyle@wonderworks.com>
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;; Keywords: mouse
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; This package lets you drag the modeline, vertical bar and
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;; scrollbar to resize windows. Suggested bindings are:
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;;
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;; (global-set-key [mode-line down-mouse-1] 'mldrag-drag-mode-line)
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;; (global-set-key [vertical-line down-mouse-1] 'mldrag-drag-vertical-line)
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;; (global-set-key [vertical-scroll-bar S-down-mouse-1]
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;; 'mldrag-drag-vertical-line)
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;;
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;; Put the bindings and (require 'mldrag) in your .emacs file.
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;;; Code:
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(provide 'mldrag)
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(defun mldrag-drag-mode-line (start-event)
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"Change the height of the current window with the mouse.
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This command should be bound to a down-mouse- event, and is most
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usefully bound with the `mode-line' prefix. Holding down a mouse
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button and moving the mouse up and down will make the clicked-on
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window taller or shorter."
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(interactive "e")
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(let ((done nil)
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(echo-keystrokes 0)
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(start-event-frame (window-frame (car (car (cdr start-event)))))
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(start-event-window (car (car (cdr start-event))))
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(start-nwindows (count-windows t))
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(old-selected-window (selected-window))
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should-enlarge-minibuffer
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event mouse minibuffer y top bot edges wconfig params growth)
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(setq params (frame-parameters))
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(if (and (not (setq minibuffer (cdr (assq 'minibuffer params))))
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(one-window-p t))
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(error "Attempt to resize sole window"))
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(unwind-protect
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(track-mouse
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(progn
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;; enlarge-window only works on the selected window, so
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;; we must select the window where the start event originated.
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;; unwind-protect will restore the old selected window later.
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(select-window start-event-window)
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;; if this is the bottommost ordinary window, then to
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;; move its modeline the minibuffer must be enlarged.
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(setq should-enlarge-minibuffer
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(and minibuffer
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(not (one-window-p t))
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(= (nth 1 (window-edges minibuffer))
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(nth 3 (window-edges)))))
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;; loop reading events and sampling the position of
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;; the mouse.
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(while (not done)
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(setq event (read-event)
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mouse (mouse-position))
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;; do nothing if
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;; - there is a switch-frame event.
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;; - the mouse isn't in the frame that we started in
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;; - the mouse isn't in any Emacs frame
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;; drag if
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;; - there is a mouse-movement event
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;; - there is a scroll-bar-movement event
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;; (same as mouse movement for our purposes)
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;; quit if
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;; - there is a keyboard event or some other unknown event
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;; unknown event.
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(cond ((integerp event)
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(setq done t))
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((eq (car event) 'switch-frame)
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nil)
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((not (memq (car event)
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'(mouse-movement scroll-bar-movement)))
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(setq done t))
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((not (eq (car mouse) start-event-frame))
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nil)
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((null (car (cdr mouse)))
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nil)
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(t
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(setq y (cdr (cdr mouse))
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edges (window-edges)
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top (nth 1 edges)
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bot (nth 3 edges))
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;; scale back a move that would make the
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;; window too short.
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(cond ((< (- y top -1) window-min-height)
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(setq y (+ top window-min-height -1))))
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;; compute size change needed
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(setq growth (- y bot -1)
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wconfig (current-window-configuration))
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;; grow/shrink minibuffer?
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(if should-enlarge-minibuffer
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(progn
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;; yes. briefly select minibuffer so
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;; enlarge-window will affect the
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;; correct window.
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(select-window minibuffer)
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;; scale back shrinkage if it would
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;; make the minibuffer less than 1
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;; line tall.
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(if (and (> growth 0)
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(< (- (window-height minibuffer)
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growth)
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1))
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(setq growth (1- (window-height minibuffer))))
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(enlarge-window (- growth))
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(select-window start-event-window))
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;; no. grow/shrink the selected window
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(enlarge-window growth))
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;; if this window's growth caused another
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;; window to be deleted because it was too
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;; short, rescind the change.
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;;
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;; if size change caused space to be stolen
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;; from a window above this one, rescind the
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;; change, but only if we didn't grow/srhink
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;; the minibuffer. minibuffer size changes
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;; can cause all windows to shrink... no way
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;; around it.
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(if (or (/= start-nwindows (count-windows t))
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(and (not should-enlarge-minibuffer)
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(/= top (nth 1 (window-edges)))))
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(set-window-configuration wconfig)))))))
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;; restore the old selected window
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(select-window old-selected-window))))
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(defun mldrag-drag-vertical-line (start-event)
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"Change the width of the current window with the mouse.
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This command should be bound to a down-mouse- event, and is most
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usefully bound with the `vertical-line' or the `vertical-scroll-bar'
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prefix. Holding down a mouse button and moving the mouse left and
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right will make the clicked-on window thinner or wider."
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(interactive "e")
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(let* ((done nil)
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(echo-keystrokes 0)
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(start-event-frame (window-frame (car (car (cdr start-event)))))
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(scroll-bar-left
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(eq (cdr (assq 'vertical-scroll-bars (frame-parameters))) 'left))
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(start-event-window (car (car (cdr start-event))))
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(start-nwindows (count-windows t))
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(old-selected-window (selected-window))
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event mouse x left right edges wconfig growth)
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(if (one-window-p t)
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(error "Attempt to resize sole ordinary window"))
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(if scroll-bar-left
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(when (= (nth 0 (window-edges start-event-window)) 0)
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(error "Attempt to drag leftmost scrollbar"))
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(when (>= (nth 2 (window-edges start-event-window))
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(frame-width start-event-frame))
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(error "Attempt to drag rightmost scrollbar")))
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(unwind-protect
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(track-mouse
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(progn
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;; enlarge-window only works on the selected window, so
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;; we must select the window where the start event originated.
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;; unwind-protect will restore the old selected window later.
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(select-window start-event-window)
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;; loop reading events and sampling the position of
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;; the mouse.
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(while (not done)
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(setq event (read-event)
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mouse (mouse-position))
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;; do nothing if
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;; - there is a switch-frame event.
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;; - the mouse isn't in the frame that we started in
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;; - the mouse isn't in any Emacs frame
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;; drag if
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;; - there is a mouse-movement event
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;; - there is a scroll-bar-movement event
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;; (same as mouse movement for our purposes)
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;; quit if
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;; - there is a keyboard event or some other unknown event
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;; unknown event.
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(cond ((integerp event)
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(setq done t))
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((eq (car event) 'switch-frame)
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nil)
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((not (memq (car event)
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'(mouse-movement scroll-bar-movement)))
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(setq done t))
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((not (eq (car mouse) start-event-frame))
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nil)
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((null (car (cdr mouse)))
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nil)
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(t
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(setq x (car (cdr mouse))
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edges (window-edges)
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left (nth 0 edges)
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right (nth 2 edges))
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;; scale back a move that would make the
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;; window too thin.
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(if scroll-bar-left
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(cond ((< (- right x) window-min-width)
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(setq x (- right window-min-width))))
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(cond ((< (- x left -1) window-min-width)
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(setq x (+ left window-min-width -1)))))
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;; compute size change needed
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(setq growth (if scroll-bar-left
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(- left x)
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(- x right -1))
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wconfig (current-window-configuration))
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(enlarge-window growth t)
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;; if this window's growth caused another
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;; window to be deleted because it was too
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;; thin, rescind the change.
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;;
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;; if size change caused space to be stolen
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;; from a window to the left of this one,
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;; rescind the change.
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(if (or (/= start-nwindows (count-windows t))
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(if scroll-bar-left
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(/= right (nth 2 (window-edges)))
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(/= left (nth 0 (window-edges)))))
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(set-window-configuration wconfig)))))))
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;; restore the old selected window
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(select-window old-selected-window))))
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;; mldrag.el ends here
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