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LibCore+LibGUI: Don't fire timers in non-visible windows by default

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LibCore timers now have a TimerShouldFireWhenNotVisible flag which is
set to "No" by default.

If "No", the timer will not be fired by the event loop if it's within
a CObject tree whose nearest GWindow ancestor is currently not visible
for timer purposes. (Specificially, this means that the window is
either minimized or fully occluded, and so does not want to fire timers
just to update the UI.)

This is another nice step towards a calm and serene operating system.
This commit is contained in:
Andreas Kling 2019-12-29 15:58:07 +01:00
parent f8f2b8b520
commit 411d293961
6 changed files with 42 additions and 9 deletions
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3
Libraries/LibCore/CEventLoop.h
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@ -38,7 +38,7 @@ public:
bool was_exit_requested() const { return m_exit_requested; }
static int register_timer(CObject&, int milliseconds, bool should_reload);
static int register_timer(CObject&, int milliseconds, bool should_reload, TimerShouldFireWhenNotVisible);
static bool unregister_timer(int timer_id);
static void register_notifier(Badge<CNotifier>, CNotifier&);
@ -77,6 +77,7 @@ private:
int interval { 0 };
timeval fire_time { 0, 0 };
bool should_reload { false };
TimerShouldFireWhenNotVisible fire_when_not_visible { TimerShouldFireWhenNotVisible::No };
WeakPtr<CObject> owner;
void reload(const timeval& now);