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(w32_set_scroll_bar_thumb): Don't resize scroll-bar

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handle while dragging, except when we get close to eob.
Fix position and size calculations so we don't scroll backwards
just by clicking on the handle.
This commit is contained in:
Kim F. Storm 2007-02-19 14:45:39 +00:00
parent 86dcc2c355
commit feade1681c
1 changed files with 43 additions and 25 deletions
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68
src/w32term.c
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@ -1,6 +1,7 @@
/* Implementation of GUI terminal on the Microsoft W32 API.
Copyright (C) 1989, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001,
2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc.
Copyright (C) 1989, 1993, 1994, 1995, 1996, 1997, 1998,
1999, 2000, 2001, 2002, 2003, 2004, 2005,
2006, 2007 Free Software Foundation, Inc.
This file is part of GNU Emacs.
@ -3473,31 +3474,51 @@ w32_set_scroll_bar_thumb (bar, portion, position, whole)
int portion, position, whole;
{
Window w = SCROLL_BAR_W32_WINDOW (bar);
double range = VERTICAL_SCROLL_BAR_TOP_RANGE (f, XINT (bar->height));
/* We use the whole scroll-bar height in the calculations below, to
avoid strange effects like scrolling backwards when just clicking
on the handle (without moving it). */
double range = VERTICAL_SCROLL_BAR_TOP_RANGE (f, XINT (bar->height))
+ VERTICAL_SCROLL_BAR_MIN_HANDLE;
int sb_page, sb_pos;
BOOL draggingp = !NILP (bar->dragging) ? TRUE : FALSE;
SCROLLINFO si;
/* We used to change the nPage setting while dragging the handle,
but that had very strange effects (such as scrolling backwards
while dragging downwards).
Now, we don't change the nPage setting while dragging unless we
get near to the end of the buffer, in which case we often have to
resize the handle to "go all the way". */
if (draggingp)
{
int near_bottom_p;
BLOCK_INPUT;
si.cbSize = sizeof (si);
si.fMask = SIF_POS | SIF_PAGE;
GetScrollInfo(w, SB_CTL, &si);
near_bottom_p = si.nPos + si.nPage >= range;
UNBLOCK_INPUT;
if (!near_bottom_p)
return;
}
if (whole)
{
#if 0
/* This code is not used (the settings are overwritten
immediately by the lines below it).
Should it be used? KFS 2007-02-19. */
/* Position scroll bar at rock bottom if the bottom of the
buffer is visible. This avoids shinking the thumb away
to nothing if it is held at the bottom of the buffer. */
if (position + portion >= whole)
{
sb_page = range * (whole - position) / whole
+ VERTICAL_SCROLL_BAR_MIN_HANDLE;
sb_pos = range;
}
#endif
sb_page = portion * range / whole + VERTICAL_SCROLL_BAR_MIN_HANDLE;
sb_pos = position * range / whole;
if (position + portion >= whole && !draggingp)
{
sb_page = range * (whole - position) / whole;
sb_pos = range;
}
else
{
sb_pos = position * range / whole;
sb_page = (min (portion, (whole - position)) * range) / whole;
}
}
else
{
@ -3505,19 +3526,16 @@ w32_set_scroll_bar_thumb (bar, portion, position, whole)
sb_pos = 0;
}
sb_page = max (sb_page, VERTICAL_SCROLL_BAR_MIN_HANDLE);
BLOCK_INPUT;
si.cbSize = sizeof (si);
/* Only update page size if currently dragging, to reduce
flicker effects. */
if (draggingp)
si.fMask = SIF_PAGE;
else
si.fMask = SIF_PAGE | SIF_POS;
si.fMask = SIF_PAGE | SIF_POS;
si.nPage = sb_page;
si.nPos = sb_pos;
SetScrollInfo (w, SB_CTL, &si, !draggingp);
SetScrollInfo (w, SB_CTL, &si, TRUE);
UNBLOCK_INPUT;
}