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LibCore: Add a way to install an event filter on a Core::Object
The event filter is consulted by Object::dispatch_event() and may decide that the event should not be delivered to the target object.
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2 changed files with 13 additions and 2 deletions
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -227,6 +227,9 @@ void Object::dispatch_event(Core::Event& e, Object* stay_within)
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VERIFY(!stay_within || stay_within == this || stay_within->is_ancestor_of(*this));
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auto* target = this;
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do {
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// If there's an event filter on this target, ask if it wants to swallow this event.
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if (target->m_event_filter && !target->m_event_filter(e))
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return;
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target->event(e);
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target = target->parent();
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if (target == stay_within) {
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@ -262,4 +265,9 @@ void Object::register_property(const String& name, Function<JsonValue()> getter,
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m_properties.set(name, make<Property>(name, move(getter), move(setter)));
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}
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void Object::set_event_filter(Function<bool(Core::Event&)> filter)
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{
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m_event_filter = move(filter);
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}
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}
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@ -1,5 +1,5 @@
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/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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@ -113,6 +113,8 @@ public:
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void remove_child(Object&);
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void remove_all_children();
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void set_event_filter(Function<bool(Core::Event&)>);
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void dump_tree(int indent = 0);
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void deferred_invoke(Function<void(Object&)>);
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@ -169,6 +171,7 @@ private:
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unsigned m_inspector_count { 0 };
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HashMap<String, NonnullOwnPtr<Property>> m_properties;
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NonnullRefPtrVector<Object> m_children;
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Function<bool(Core::Event&)> m_event_filter;
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};
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}
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