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be010748 | 1 | ;;; mldrag.el --- mode line and vertical line dragging to resize windows |
813f532d RS |
2 | ;;; Copyright (C) 1994 Free Software Foundation, Inc. |
3 | ||
4 | ;; Author: Kyle E. Jones <kyle@wonderworks.com> | |
5 | ;; Keywords: mouse | |
6 | ||
7 | ;; This file is part of GNU Emacs. | |
8 | ||
9 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
10 | ;; it under the terms of the GNU General Public License as published by | |
11 | ;; the Free Software Foundation; either version 2, or (at your option) | |
12 | ;; any later version. | |
13 | ||
14 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
15 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
16 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
17 | ;; GNU General Public License for more details. | |
18 | ||
19 | ;; You should have received a copy of the GNU General Public License | |
20 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
21 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
22 | ||
23 | ;;; Commentary: | |
24 | ||
25 | ;; This package lets you drag the modeline, vertical bar and | |
26 | ;; scrollbar to resize windows. Suggested bindings are: | |
27 | ;; | |
28 | ;; (global-set-key [mode-line down-mouse-1] 'mldrag-drag-mode-line) | |
29 | ;; (global-set-key [vertical-line down-mouse-1] 'mldrag-drag-vertical-line) | |
30 | ;; (global-set-key [vertical-scroll-bar S-down-mouse-1] | |
31 | ;; 'mldrag-drag-vertical-line) | |
32 | ;; | |
33 | ;; Put the bindings and (require 'mldrag) in your .emacs file. | |
34 | ||
35 | ;;; Code: | |
36 | ||
37 | (provide 'mldrag) | |
38 | ||
39 | (defun mldrag-drag-mode-line (start-event) | |
40 | "Change the height of the current window with the mouse. | |
41 | This command should be bound to a down-mouse- event, and is most | |
42 | usefully bound with the `mode-line' prefix. Holding down a mouse | |
43 | button and moving the mouse up and down will make the clicked-on | |
44 | window taller or shorter." | |
45 | (interactive "e") | |
46 | (let ((done nil) | |
47 | (echo-keystrokes 0) | |
48 | (start-event-frame (window-frame (car (car (cdr start-event))))) | |
49 | (start-event-window (car (car (cdr start-event)))) | |
50 | (start-nwindows (count-windows t)) | |
51 | (old-selected-window (selected-window)) | |
52 | should-enlarge-minibuffer | |
53 | event mouse minibuffer y top bot edges wconfig params growth) | |
54 | (setq params (frame-parameters)) | |
55 | (if (and (not (setq minibuffer (cdr (assq 'minibuffer params)))) | |
56 | (one-window-p t)) | |
57 | (error "Attempt to resize sole window")) | |
58 | (unwind-protect | |
59 | (track-mouse | |
60 | (progn | |
61 | ;; enlarge-window only works on the selected window, so | |
62 | ;; we must select the window where the start event originated. | |
63 | ;; unwind-protect will restore the old selected window later. | |
64 | (select-window start-event-window) | |
65 | ;; if this is the bottommost ordinary window, then to | |
66 | ;; move its modeline the minibuffer must be enlarged. | |
67 | (setq should-enlarge-minibuffer | |
68 | (and minibuffer | |
69 | (not (one-window-p t)) | |
70 | (= (nth 1 (window-edges minibuffer)) | |
71 | (nth 3 (window-edges))))) | |
72 | ;; loop reading events and sampling the position of | |
73 | ;; the mouse. | |
74 | (while (not done) | |
75 | (setq event (read-event) | |
76 | mouse (mouse-position)) | |
77 | ;; do nothing if | |
78 | ;; - there is a switch-frame event. | |
79 | ;; - the mouse isn't in the frame that we started in | |
80 | ;; - the mouse isn't in any Emacs frame | |
81 | ;; drag if | |
82 | ;; - there is a mouse-movement event | |
83 | ;; - there is a scroll-bar-movement event | |
84 | ;; (same as mouse movement for our purposes) | |
85 | ;; quit if | |
86 | ;; - there is a keyboard event or some other unknown event | |
87 | ;; unknown event. | |
88 | (cond ((integerp event) | |
89 | (setq done t)) | |
90 | ((eq (car event) 'switch-frame) | |
91 | nil) | |
92 | ((not (memq (car event) | |
93 | '(mouse-movement scroll-bar-movement))) | |
94 | (setq done t)) | |
95 | ((not (eq (car mouse) start-event-frame)) | |
96 | nil) | |
97 | ((null (car (cdr mouse))) | |
98 | nil) | |
99 | (t | |
100 | (setq y (cdr (cdr mouse)) | |
101 | edges (window-edges) | |
102 | top (nth 1 edges) | |
103 | bot (nth 3 edges)) | |
104 | ;; scale back a move that would make the | |
105 | ;; window too short. | |
106 | (cond ((< (- y top -1) window-min-height) | |
107 | (setq y (+ top window-min-height -1)))) | |
108 | ;; compute size change needed | |
109 | (setq growth (- y bot -1) | |
110 | wconfig (current-window-configuration)) | |
111 | ;; grow/shrink minibuffer? | |
112 | (if should-enlarge-minibuffer | |
113 | (progn | |
114 | ;; yes. briefly select minibuffer so | |
165af501 | 115 | ;; enlarge-window will affect the |
813f532d RS |
116 | ;; correct window. |
117 | (select-window minibuffer) | |
118 | ;; scale back shrinkage if it would | |
119 | ;; make the minibuffer less than 1 | |
120 | ;; line tall. | |
121 | (if (and (> growth 0) | |
122 | (< (- (window-height minibuffer) | |
123 | growth) | |
124 | 1)) | |
125 | (setq growth (1- (window-height minibuffer)))) | |
126 | (enlarge-window (- growth)) | |
127 | (select-window start-event-window)) | |
128 | ;; no. grow/shrink the selected window | |
129 | (enlarge-window growth)) | |
130 | ;; if this window's growth caused another | |
131 | ;; window to be deleted because it was too | |
132 | ;; short, rescind the change. | |
133 | ;; | |
134 | ;; if size change caused space to be stolen | |
135 | ;; from a window above this one, rescind the | |
136 | ;; change, but only if we didn't grow/srhink | |
137 | ;; the minibuffer. minibuffer size changes | |
138 | ;; can cause all windows to shrink... no way | |
139 | ;; around it. | |
140 | (if (or (/= start-nwindows (count-windows t)) | |
141 | (and (not should-enlarge-minibuffer) | |
142 | (/= top (nth 1 (window-edges))))) | |
143 | (set-window-configuration wconfig))))))) | |
144 | ;; restore the old selected window | |
145 | (select-window old-selected-window)))) | |
146 | ||
147 | (defun mldrag-drag-vertical-line (start-event) | |
148 | "Change the width of the current window with the mouse. | |
149 | This command should be bound to a down-mouse- event, and is most | |
150 | usefully bound with the `vertical-line' or the `vertical-scroll-bar' | |
151 | prefix. Holding down a mouse button and moving the mouse left and | |
152 | right will make the clicked-on window thinner or wider." | |
153 | (interactive "e") | |
154 | (let ((done nil) | |
155 | (echo-keystrokes 0) | |
156 | (start-event-frame (window-frame (car (car (cdr start-event))))) | |
157 | (start-event-window (car (car (cdr start-event)))) | |
158 | (start-nwindows (count-windows t)) | |
159 | (old-selected-window (selected-window)) | |
160 | event mouse x left right edges wconfig growth) | |
161 | (if (one-window-p t) | |
162 | (error "Attempt to resize sole ordinary window")) | |
163 | (if (= (nth 2 (window-edges start-event-window)) | |
164 | (frame-width start-event-frame)) | |
165 | (error "Attempt to drag rightmost scrollbar")) | |
166 | (unwind-protect | |
167 | (track-mouse | |
168 | (progn | |
169 | ;; enlarge-window only works on the selected window, so | |
170 | ;; we must select the window where the start event originated. | |
171 | ;; unwind-protect will restore the old selected window later. | |
172 | (select-window start-event-window) | |
173 | ;; loop reading events and sampling the position of | |
174 | ;; the mouse. | |
175 | (while (not done) | |
176 | (setq event (read-event) | |
177 | mouse (mouse-position)) | |
178 | ;; do nothing if | |
179 | ;; - there is a switch-frame event. | |
180 | ;; - the mouse isn't in the frame that we started in | |
181 | ;; - the mouse isn't in any Emacs frame | |
182 | ;; drag if | |
183 | ;; - there is a mouse-movement event | |
184 | ;; - there is a scroll-bar-movement event | |
185 | ;; (same as mouse movement for our purposes) | |
186 | ;; quit if | |
187 | ;; - there is a keyboard event or some other unknown event | |
188 | ;; unknown event. | |
189 | (cond ((integerp event) | |
190 | (setq done t)) | |
191 | ((eq (car event) 'switch-frame) | |
192 | nil) | |
193 | ((not (memq (car event) | |
194 | '(mouse-movement scroll-bar-movement))) | |
195 | (setq done t)) | |
196 | ((not (eq (car mouse) start-event-frame)) | |
197 | nil) | |
198 | ((null (car (cdr mouse))) | |
199 | nil) | |
200 | (t | |
201 | (setq x (car (cdr mouse)) | |
202 | edges (window-edges) | |
203 | left (nth 0 edges) | |
204 | right (nth 2 edges)) | |
205 | ;; scale back a move that would make the | |
206 | ;; window too thin. | |
207 | (cond ((< (- x left -1) window-min-width) | |
208 | (setq x (+ left window-min-width -1)))) | |
209 | ;; compute size change needed | |
210 | (setq growth (- x right -1) | |
211 | wconfig (current-window-configuration)) | |
212 | (enlarge-window growth t) | |
213 | ;; if this window's growth caused another | |
214 | ;; window to be deleted because it was too | |
215 | ;; thin, rescind the change. | |
216 | ;; | |
217 | ;; if size change caused space to be stolen | |
218 | ;; from a window to the left of this one, | |
219 | ;; rescind the change. | |
220 | (if (or (/= start-nwindows (count-windows t)) | |
221 | (/= left (nth 0 (window-edges)))) | |
222 | (set-window-configuration wconfig))))))) | |
223 | ;; restore the old selected window | |
224 | (select-window old-selected-window)))) | |
225 | ||
226 | ;; mldrag.el ends here |