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/*
* Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include <AK/Badge.h>
#include <AK/Function.h>
#include <AK/HashMap.h>
#include <LibGUI/DisplayLink.h>
#include <LibGUI/WindowServerConnection.h>
namespace GUI {
class DisplayLinkCallback : public RefCounted<DisplayLinkCallback> {
public:
DisplayLinkCallback(i32 link_id, Function<void(i32)> callback)
: m_link_id(link_id)
, m_callback(move(callback))
{
}
void invoke()
{
m_callback(m_link_id);
}
private:
i32 m_link_id { 0 };
Function<void(i32)> m_callback;
};
static HashMap<i32, RefPtr<DisplayLinkCallback>>& callbacks()
{
static HashMap<i32, RefPtr<DisplayLinkCallback>>* map;
if (!map)
map = new HashMap<i32, RefPtr<DisplayLinkCallback>>;
return *map;
}
static i32 s_next_callback_id = 1;
i32 DisplayLink::register_callback(Function<void(i32)> callback)
{
if (callbacks().is_empty())
WindowServerConnection::the().async_enable_display_link();
i32 callback_id = s_next_callback_id++;
callbacks().set(callback_id, adopt_ref(*new DisplayLinkCallback(callback_id, move(callback))));
return callback_id;
}
bool DisplayLink::unregister_callback(i32 callback_id)
{
VERIFY(callbacks().contains(callback_id));
callbacks().remove(callback_id);
if (callbacks().is_empty())
WindowServerConnection::the().async_disable_display_link();
return true;
}
void DisplayLink::notify(Badge<WindowServerConnection>)
{
auto copy_of_callbacks = callbacks();
for (auto& it : copy_of_callbacks)
it.value->invoke();
}
}
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