Commit 351d52f7 authored by Karl Heuer's avatar Karl Heuer

* mouse-drag.el (mouse-drag-electric-col-scrolling): New variable;

auto-enables horizontal scrolling when clicks on wrapped
lines occur.
parent ac6e572c
;;; mouse-drag.el --- use mouse-2 to do a new style of scrolling
;; Copyright (C) 1996 Free Software Foundation, Inc.
;; Copyright (C) 1996, 1997 Free Software Foundation, Inc.
;; Author: John Heidemann <johnh@ISI.EDU>
;; Keywords: mouse
......@@ -61,6 +61,8 @@
;;;
;;; - reverse the throw-scroll direction with \\[mouse-throw-with-scroll-bar]
;;; - work around a bug with \\[mouse-extras-work-around-drag-bug]
;;; - auto-enable horizontal scrolling with
;;; \\[mouse-drag-electric-col-scrolling]
;;;
;;;
;;; History and related work:
......@@ -91,20 +93,11 @@
;;; -johnh@isi.edu, 11-Jul-96
;;;
;;;
;;; Old changes, for reference:
;;; What's new with mouse-drag 2.24?
;;;
;;; What's new with mouse-extras 2.21?
;;;
;;; - support for emacs-19.{29,30}
;;; - point now stays on the visible screen during horizontal scrolling
;;; (bug identified and fix suggested by Tom Wurgler <twurgler@goodyear.com>)
;;; - better work-around for lost-mouse-events bug (supports double/triple
;;; clicks), see \\[mouse-extras-work-around-drag-bug] for details.
;;; - work-around for lost-mouse-events bug now is OFF by default;
;;; enable it if you have problems
;;;
;;; - mouse-drag-electric-col-scrolling (default: on)
;;; auto-enables horizontal scrolling when clicks on wrapped
;;; lines occur
;;; Code:
......@@ -155,11 +148,24 @@ Keep the cursor on the screen as needed."
(= (car start-col-row) (car end-col-row))
(= (cdr start-col-row) (cdr end-col-row)))))
(defvar mouse-drag-electric-col-scrolling t
"If non-nil, mouse-drag on a long line enables truncate-lines.")
(defun mouse-drag-should-do-col-scrolling ()
"* Determine if it's wise to enable col-scrolling for the current window."
"* Determine if it's wise to enable col-scrolling for the current window.
Basically, we check for existing horizontal scrolling."
(or truncate-lines
(> (window-hscroll (selected-window)) 0)
(< (window-width) (screen-width))))
(< (window-width) (screen-width))
(and
mouse-drag-electric-col-scrolling
(save-excursion ;; on a long line?
(let
((beg (progn (beginning-of-line) (point)))
(end (progn (end-of-line) (point))))
(if (> (- end beg) (window-width))
(setq truncate-lines t)
nil))))))
(defvar mouse-throw-with-scroll-bar nil
"* Set direction of mouse-throwing.
......
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