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92 lines
2.9 KiB
C++
92 lines
2.9 KiB
C++
/*
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* Copyright (c) 2020, 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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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <AK/Badge.h>
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#include <AK/Function.h>
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#include <AK/HashMap.h>
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#include <LibGUI/DisplayLink.h>
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#include <LibGUI/WindowServerConnection.h>
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namespace GUI {
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class DisplayLinkCallback : public RefCounted<DisplayLinkCallback> {
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public:
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DisplayLinkCallback(i32 link_id, Function<void(i32)> callback)
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: m_link_id(link_id)
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, m_callback(move(callback))
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{
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}
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void invoke()
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{
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m_callback(m_link_id);
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}
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private:
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i32 m_link_id { 0 };
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Function<void(i32)> m_callback;
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};
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static HashMap<i32, RefPtr<DisplayLinkCallback>>& callbacks()
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{
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static HashMap<i32, RefPtr<DisplayLinkCallback>>* map;
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if (!map)
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map = new HashMap<i32, RefPtr<DisplayLinkCallback>>;
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return *map;
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}
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static i32 s_next_callback_id = 1;
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i32 DisplayLink::register_callback(Function<void(i32)> callback)
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{
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if (callbacks().is_empty())
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WindowServerConnection::the().post_message(Messages::WindowServer::EnableDisplayLink());
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i32 callback_id = s_next_callback_id++;
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callbacks().set(callback_id, adopt(*new DisplayLinkCallback(callback_id, move(callback))));
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return callback_id;
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}
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bool DisplayLink::unregister_callback(i32 callback_id)
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{
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ASSERT(callbacks().contains(callback_id));
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callbacks().remove(callback_id);
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if (callbacks().is_empty())
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WindowServerConnection::the().post_message(Messages::WindowServer::DisableDisplayLink());
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return true;
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}
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void DisplayLink::notify(Badge<WindowServerConnection>)
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{
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auto copy_of_callbacks = callbacks();
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for (auto& it : copy_of_callbacks)
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it.value->invoke();
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}
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}
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