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author | Jim Blandy <jimb@redhat.com> | 1992-10-03 01:09:59 +0000 |
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committer | Jim Blandy <jimb@redhat.com> | 1992-10-03 01:09:59 +0000 |
commit | 45288343f0ac5a43da5fe417db07626357fd2041 (patch) | |
tree | d50896b70580d46e356921c4440d12f43376013e /src/termhooks.h | |
parent | 350273a493c0a1e4da6127bf29c237312be7e758 (diff) | |
download | emacs-45288343f0ac5a43da5fe417db07626357fd2041.tar.gz |
Doc fix.
Diffstat (limited to 'src/termhooks.h')
-rw-r--r-- | src/termhooks.h | 15 |
1 files changed, 10 insertions, 5 deletions
diff --git a/src/termhooks.h b/src/termhooks.h index 695c5a316e5..c7f9d3d0909 100644 --- a/src/termhooks.h +++ b/src/termhooks.h @@ -165,11 +165,16 @@ struct input_event { The modifiers applied to mouse clicks are rather ornate. The window-system-specific code should store mouse clicks with - up_modifier or down_modifier set; the window-system independent - code turns all up_modifier events into either drag_modifier or - click_modifier. The click_modifier has no written representation - in the names of the symbols used as event heads, but it does appear - in the Qevent_symbol_components property of the event heads. */ + up_modifier or down_modifier set. Having an explicit down modifier + simplifies some of window-system-independent code; without it, the + code would have to recognize down events by checking if the event + is a mouse click lacking the click and drag modifiers. + + The window-system independent code turns all up_modifier events + bits into either drag_modifier or click_modifier events. The + click_modifier has no written representation in the names of the + symbols used as event heads, but it does appear in the + Qevent_symbol_components property of the event heads. */ enum { up_modifier = 1, /* Only used on mouse buttons - always turned into a click or a drag modifier |