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Code Issues Activity Actions

Coalesce mouse events to make the GUI go fast.

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A simple but effective optimization that avoids tons of redraw. :^)
This commit is contained in:
Andreas Kling 2019-01-12 06:57:17 +01:00
parent 57b13274da
commit 07873332e7
2 changed files with 16 additions and 3 deletions
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17
Widgets/EventLoop.cpp
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@ -66,11 +66,26 @@ void EventLoop::postEvent(Object* receiver, OwnPtr<Event>&& event)
void EventLoop::waitForEvent()
{
auto& mouse = PS2MouseDevice::the();
auto& screen = AbstractScreen::the();
bool prev_left_button = screen.left_mouse_button_pressed();
bool prev_right_button = screen.right_mouse_button_pressed();
int dx = 0;
int dy = 0;
while (mouse.has_data_available_for_reading()) {
signed_byte data[3];
ssize_t nread = mouse.read((byte*)data, 3);
ASSERT(nread == 3);
AbstractScreen::the().on_receive_mouse_data(data[1], -data[2], data[0] & 1, data[0] & 2);
bool left_button = data[0] & 1;
bool right_button = data[0] & 2;
dx += data[1];
dy += -data[2];
if (left_button != prev_left_button || right_button != prev_right_button || !mouse.has_data_available_for_reading()) {
prev_left_button = left_button;
prev_right_button = right_button;
screen.on_receive_mouse_data(dx, dy, left_button, right_button);
dx = 0;
dy = 0;
}
}
}
#endif