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graphics/nxbe/nxbe_raise.c: Fix a critical list handling bug in the grahics system. When a lower-level window was raised while a model window was in place, then list corruption could occur.

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This commit is contained in:
Gregory Nutt 2019-05-23 09:12:57 -06:00
parent ad8dc791ef
commit 5a41056a2f
3 changed files with 15 additions and 6 deletions
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4
graphics/nxbe/nxbe_lower.c
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@ -98,7 +98,9 @@ void nxbe_lower(FAR struct nxbe_window_s *wnd)
below = wnd->below;
/* Then put the lowered window at the bottom (just above the background window) */
/* Then put the lowered window at the bottom (just above the background
* window).
*/
wnd->below = &be->bkgd;
wnd->above = be->bkgd.above;

15
graphics/nxbe/nxbe_raise.c
View file

@ -110,17 +110,24 @@ void nxbe_raise(FAR struct nxbe_window_s *wnd)
if (NXBE_STATE_ISMODAL(be) && be->topwnd->below != NULL)
{
FAR struct nxbe_window_s *above;
FAR struct nxbe_window_s *below;
/* We are in a modal state. The topwnd is not the background and it
* has focus.
*/
wnd->above = be->topwnd;
wnd->below = be->topwnd->below;
above = be->topwnd;
below = be->topwnd->below;
be->topwnd->below = wnd;
wnd->above = above;
wnd->below = below;
above->below = wnd;
below->above = wnd;
/* Then redraw this window AND all windows below it. Having moved the
* window, we may have exposed previoulsy obscured portions of windows
* window, we may have exposed previously obscured portions of windows
* below this one.
*/

2
graphics/nxbe/nxbe_setposition.c
View file

@ -88,7 +88,7 @@ void nxbe_setposition(FAR struct nxbe_window_s *wnd,
nxmu_reportposition(wnd);
/* Then redraw this window AND all windows below it. Having moved the
* window, we may have exposed previoulsy obscured portions of windows
* window, we may have exposed previously obscured portions of windows
* below this one.
*/