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