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| author | Lukas Fleischer <calcurse@cryptocrack.de> | 2012-06-27 11:31:08 +0200 |
|---|---|---|
| committer | Lukas Fleischer <calcurse@cryptocrack.de> | 2012-06-30 14:34:36 +0200 |
| commit | 7a75415a619bd6698f45ec24f696f7b9dbb3752c (patch) | |
| tree | 90a8c32c6def32e16e2454cb39e8b857dabe1062 /src/calendar.c | |
| parent | 81d97315c7dad26edf1dcfba849d57c3299e0f6b (diff) | |
| download | calcurse-7a75415a619bd6698f45ec24f696f7b9dbb3752c.zip | |
Implement a cache for the monthly view
Add a very simple cache, which is used to store the days that contain an
event or an appointment. This makes redrawing and browsing the calendar
panel much faster.
The cache has a size of 31 integers (which is equivalent to 124 bytes on
a 32 bit system and 248 bytes on a 64 bit system) and invalidates itself
if the current month has changed. If an item is added/changed/removed,
the cache needs to be invalidated manually by calling
calendar_monthly_view_cache_set_invalid(). Note that this will always
invalidate the whole cache, even if only one item at the last day of the
month was removed. This is a trade-off between simplicity and
efficiency.
Signed-off-by: Lukas Fleischer <calcurse@cryptocrack.de>
Diffstat (limited to 'src/calendar.c')
| -rw-r--r-- | src/calendar.c | 25 |
1 files changed, 24 insertions, 1 deletions
diff --git a/src/calendar.c b/src/calendar.c index a157caa..61e758b 100644 --- a/src/calendar.c +++ b/src/calendar.c @@ -77,6 +77,10 @@ static void (*draw_calendar[CAL_VIEWS]) (struct window *, struct date *, unsigned) = { draw_monthly_view, draw_weekly_view}; +static int monthly_view_cache[MAXDAYSPERMONTH]; +static int monthly_view_cache_valid = 0; +static int monthly_view_cache_month = 0; + /* Switch between calendar views (monthly view is selected by default). */ void calendar_view_next(void) { @@ -264,6 +268,11 @@ static int date_change(struct tm *date, int delta_month, int delta_day) } } +void calendar_monthly_view_cache_set_invalid(void) +{ + monthly_view_cache_valid = 0; +} + /* Draw the monthly view inside calendar panel. */ static void draw_monthly_view(struct window *cwin, struct date *current_day, @@ -313,13 +322,25 @@ draw_monthly_view(struct window *cwin, struct date *current_day, day_1_sav = (c_day_1 + 1) * 3 + c_day_1 - 7; + /* invalidate cache if a new month is selected */ + if (yr * YEARINMONTHS + mo != monthly_view_cache_month) { + monthly_view_cache_month = yr * YEARINMONTHS + mo; + monthly_view_cache_valid = 0; + } + for (c_day = 1; c_day <= numdays; ++c_day, ++c_day_1, c_day_1 %= 7) { check_day.dd = c_day; check_day.mm = slctd_day.mm; check_day.yyyy = slctd_day.yyyy; /* check if the day contains an event or an appointment */ - item_this_day = day_check_if_item(check_day); + if (monthly_view_cache_valid) { + item_this_day = monthly_view_cache[c_day - 1]; + } + else { + item_this_day = monthly_view_cache[c_day - 1] = + day_check_if_item(check_day); + } /* Go to next line, the week is over. */ if (!c_day_1 && 1 != c_day) { @@ -352,6 +373,8 @@ draw_monthly_view(struct window *cwin, struct date *current_day, mvwprintw(cwin->p, ofs_y + 1, ofs_x + day_1_sav + 4 * c_day + 1, "%2d", c_day); } + + monthly_view_cache_valid = 1; } static int weeknum(const struct tm *t, int firstweekday) |