master d8a00879309: Cease preloading touch-screen.el outside X and Android

[Po Lu]

branch: master
commit d8a00879309a3bf62f6ffcae103aa3bdba776ee9
Author: Po Lu <luangruo@yahoo.com>
Commit: Po Lu <luangruo@yahoo.com>

    Cease preloading touch-screen.el outside X and Android
    
    * lisp/calc/calc.el (touch-screen-display-keyboard):
    
    * lisp/minibuffer.el (clear-minibuffer-message):
    
    * lisp/term.el (touch-screen-display-keyboard): Declare
    touch-screen-display-keyboard before binding or setting it.
    
    * lisp/loadup.el: Don't autoload touch-screen.el outside X and
    Android.
    
    * lisp/touch-screen.el: Autoload functions called from commands
    responding to touch screen events.
---
 lisp/calc/calc.el    | 2 ++
 lisp/loadup.el       | 6 ++----
 lisp/minibuffer.el   | 2 +-
 lisp/term.el         | 2 ++
 lisp/touch-screen.el | 3 +++
 5 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/lisp/calc/calc.el b/lisp/calc/calc.el
index 41aeb17c252..50623218701 100644
--- a/lisp/calc/calc.el
+++ b/lisp/calc/calc.el
@@ -1285,6 +1285,8 @@ the trail buffer."
           (setq calc-trail-buffer nil)
           t))))
 
+(defvar touch-screen-display-keyboard)
+
 (defun calc-mode ()
   "Calculator major mode.
 
diff --git a/lisp/loadup.el b/lisp/loadup.el
index d447523dc42..ef4203917d4 100644
--- a/lisp/loadup.el
+++ b/lisp/loadup.el
@@ -298,12 +298,9 @@
 (if (featurep 'dynamic-setting)
     (load "dynamic-setting"))
 
-;; touch-screen.el is tiny and is used liberally throughout the button
-;; code etc, so it may as well be preloaded everywhere.
-(load "touch-screen")
-
 (if (featurep 'x)
     (progn
+      (load "touch-screen")
       (load "x-dnd")
       (load "term/common-win")
       (load "term/x-win")))
@@ -316,6 +313,7 @@
 (if (featurep 'android)
     (progn
       (load "ls-lisp")
+      (load "touch-screen")
       (load "term/common-win")
       (load "term/android-win")))
 
diff --git a/lisp/minibuffer.el b/lisp/minibuffer.el
index 03b64198bcf..2ddaf0af120 100644
--- a/lisp/minibuffer.el
+++ b/lisp/minibuffer.el
@@ -975,7 +975,7 @@ Intended to be called via `clear-message-function'."
   ;; progress, because a preview message might currently be displayed
   ;; in the echo area.  FIXME: find some way to place this in
   ;; touch-screen.el.
-  (if (and touch-screen-preview-select
+  (if (and (bound-and-true-p touch-screen-preview-select)
            (eq (nth 3 touch-screen-current-tool) 'drag))
       'dont-clear-message
     ;; Return nil telling the caller that the message
diff --git a/lisp/term.el b/lisp/term.el
index b2875e4a17f..81746e0c20d 100644
--- a/lisp/term.el
+++ b/lisp/term.el
@@ -1085,6 +1085,8 @@ underlying shell."
   (setq term-ansi-current-invisible nil)
   (setq term-ansi-current-bg-color 0))
 
+(defvar touch-screen-display-keyboard)
+
 (define-derived-mode term-mode fundamental-mode "Term"
   "Major mode for interacting with an inferior interpreter.
 The interpreter name is same as buffer name, sans the asterisks.
diff --git a/lisp/touch-screen.el b/lisp/touch-screen.el
index 56adb75cefc..be08ae1d3c8 100644
--- a/lisp/touch-screen.el
+++ b/lisp/touch-screen.el
@@ -1913,6 +1913,7 @@ if POSN is on a link or a button, or `mouse-1' otherwise."
 
 ;; Exports.  These functions are intended for use externally.
 
+;;;###autoload
 (defun touch-screen-track-tap (event &optional update data threshold)
   "Track a single tap starting from EVENT.
 EVENT should be a `touchscreen-begin' event.
@@ -1970,6 +1971,7 @@ otherwise, return t once the `touchscreen-end' event 
arrives."
                    (eq (caadr event) (caadr new-event))))
            (t (throw 'finish nil))))))))
 
+;;;###autoload
 (defun touch-screen-track-drag (event update &optional data)
   "Track a single drag starting from EVENT.
 EVENT should be a `touchscreen-begin' event.
@@ -2017,6 +2019,7 @@ touch point in EVENT did not move significantly, and t 
otherwise."
 ;;; Event handling exports.  These functions are intended for use by
 ;;; Lisp commands bound to touch screen gesture events.
 
+;;;###autoload
 (defun touch-screen-inhibit-drag ()
   "Inhibit subsequent `touchscreen-drag' events from being sent.
 Prevent `touchscreen-drag' and translated mouse events from being