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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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2
Libraries/LibGUI/GWindow.cpp
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@ -589,6 +589,8 @@ void GWindow::update_all_windows(Badge<GWindowServerConnection>)
void GWindow::notify_state_changed(Badge<GWindowServerConnection>, bool minimized, bool occluded)
{
m_visible_for_timer_purposes = !minimized && !occluded;
// When double buffering is enabled, minimization/occlusion means we can mark the front bitmap volatile (in addition to the back bitmap.)
// When double buffering is disabled, there is only the back bitmap (which we can now mark volatile!)
RefPtr<GraphicsBitmap>& bitmap = m_double_buffering_enabled ? m_front_bitmap : m_back_bitmap;