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WindowServer: Add support for alpha channel based hit testing

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This enables implementing non-rectangular window shapes, including
non-rectangular window frames.
This commit is contained in:
Tom 2021-02-14 16:42:37 -07:00 • committed by Andreas Kling
parent b3f0a5c917
commit d590e0c946
12 changed files with 107 additions and 12 deletions
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22
Userland/Services/WindowServer/WindowManager.cpp
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@ -726,7 +726,7 @@ bool WindowManager::process_ongoing_drag(MouseEvent& event, Window*& hovered_win
hovered_window = nullptr;
for_each_visible_window_from_front_to_back([&](auto& window) {
if (window.frame().rect().contains(event.position())) {
if (window.hit_test(event.position())) {
hovered_window = &window;
return IterationDecision::Break;
}
@ -940,7 +940,7 @@ void WindowManager::process_mouse_event(MouseEvent& event, Window*& hovered_wind
}
for_each_visible_window_from_front_to_back([&](auto& window) {
if (window.frame().rect().contains(event.position())) {
if (window.hit_test(event.position())) {
hovered_window = &window;
return IterationDecision::Break;
}
@ -977,7 +977,7 @@ void WindowManager::process_mouse_event(MouseEvent& event, Window*& hovered_wind
return;
}
ASSERT(window.frame().rect().contains(event.position()));
ASSERT(window.hit_test(event.position()));
if (event.type() == Event::MouseDown) {
// We're clicking on something that's blocked by a modal window.
// Flash the modal window to let the user know about it.
@ -990,8 +990,12 @@ void WindowManager::process_mouse_event(MouseEvent& event, Window*& hovered_wind
set_active_window(&window);
}
// Well okay, let's see if we're hitting the frame or the window inside the frame.
if (window.rect().contains(event.position())) {
if (window.frame().hit_test(event.position())) {
// We are hitting the frame, pass the event along to WindowFrame.
window.frame().on_mouse_event(event.translated(-window.frame().rect().location()));
event_window_with_frame = &window;
} else if (window.hit_test(event.position(), false)) {
// We are hitting the window content
hovered_window = &window;
if (!window.global_cursor_tracking() && !window.blocking_modal_window()) {
auto translated_event = event.translated(-window.position());
@ -1001,20 +1005,14 @@ void WindowManager::process_mouse_event(MouseEvent& event, Window*& hovered_wind
m_active_input_tracking_window = window;
}
}
return;
}
// We are hitting the frame, pass the event along to WindowFrame.
window.frame().on_mouse_event(event.translated(-window.frame().rect().location()));
event_window_with_frame = &window;
};
if (auto* fullscreen_window = active_fullscreen_window()) {
process_mouse_event_for_window(*fullscreen_window);
} else {
for_each_visible_window_from_front_to_back([&](Window& window) {
auto window_frame_rect = window.frame().rect();
if (!window_frame_rect.contains(event.position()))
if (!window.hit_test(event.position()))
return IterationDecision::Continue;
process_mouse_event_for_window(window);
return IterationDecision::Break;