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LibCore: Add a way to install an event filter on a Core::Object

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The event filter is consulted by Object::dispatch_event() and may
decide that the event should not be delivered to the target object.
This commit is contained in:
Andreas Kling 2021-03-28 11:16:33 +02:00
parent c91bb72964
commit 54c7110d9d
2 changed files with 13 additions and 2 deletions
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10
Userland/Libraries/LibCore/Object.cpp
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@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@ -227,6 +227,9 @@ void Object::dispatch_event(Core::Event& e, Object* stay_within)
VERIFY(!stay_within || stay_within == this || stay_within->is_ancestor_of(*this)); VERIFY(!stay_within || stay_within == this || stay_within->is_ancestor_of(*this));
auto* target = this; auto* target = this;
do { do {
// If there's an event filter on this target, ask if it wants to swallow this event.
if (target->m_event_filter && !target->m_event_filter(e))
return;
target->event(e); target->event(e);
target = target->parent(); target = target->parent();
if (target == stay_within) { if (target == stay_within) {
@ -262,4 +265,9 @@ void Object::register_property(const String& name, Function<JsonValue()> getter,
m_properties.set(name, make<Property>(name, move(getter), move(setter))); m_properties.set(name, make<Property>(name, move(getter), move(setter)));
} }
void Object::set_event_filter(Function<bool(Core::Event&)> filter)
{
m_event_filter = move(filter);
}
} }

5
Userland/Libraries/LibCore/Object.h
View file

@ -1,5 +1,5 @@
/* /*
* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org> * Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
* All rights reserved. * All rights reserved.
* *
* Redistribution and use in source and binary forms, with or without * Redistribution and use in source and binary forms, with or without
@ -113,6 +113,8 @@ public:
void remove_child(Object&); void remove_child(Object&);
void remove_all_children(); void remove_all_children();
void set_event_filter(Function<bool(Core::Event&)>);
void dump_tree(int indent = 0); void dump_tree(int indent = 0);
void deferred_invoke(Function<void(Object&)>); void deferred_invoke(Function<void(Object&)>);
@ -169,6 +171,7 @@ private:
unsigned m_inspector_count { 0 }; unsigned m_inspector_count { 0 };
HashMap<String, NonnullOwnPtr<Property>> m_properties; HashMap<String, NonnullOwnPtr<Property>> m_properties;
NonnullRefPtrVector<Object> m_children; NonnullRefPtrVector<Object> m_children;
Function<bool(Core::Event&)> m_event_filter;
}; };
} }