1 files changed, 81 insertions, 0 deletions
diff --git a/Userland/Libraries/LibCore/Timer.h b/Userland/Libraries/LibCore/Timer.h
new file mode 100644
index 0000000000..04f41e39a0
--- /dev/null
+++ b/Userland/Libraries/LibCore/Timer.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Function.h>
+#include <LibCore/Object.h>
+
+namespace Core {
+
+class Timer final : public Object {
+    C_OBJECT(Timer);
+
+public:
+    static NonnullRefPtr<Timer> create_single_shot(int interval, Function<void()>&& timeout_handler, Object* parent = nullptr)
+    {
+        auto timer = adopt(*new Timer(interval, move(timeout_handler), parent));
+        timer->set_single_shot(true);
+        timer->stop();
+        return timer;
+    }
+
+    virtual ~Timer() override;
+
+    void start();
+    void start(int interval);
+    void restart();
+    void restart(int interval);
+    void stop();
+
+    bool is_active() const { return m_active; }
+    int interval() const { return m_interval; }
+    void set_interval(int interval)
+    {
+        if (m_interval == interval)
+            return;
+        m_interval = interval;
+        m_interval_dirty = true;
+    }
+
+    bool is_single_shot() const { return m_single_shot; }
+    void set_single_shot(bool single_shot) { m_single_shot = single_shot; }
+
+    Function<void()> on_timeout;
+
+private:
+    explicit Timer(Object* parent = nullptr);
+    Timer(int interval, Function<void()>&& timeout_handler, Object* parent = nullptr);
+
+    virtual void timer_event(TimerEvent&) override;
+
+    bool m_active { false };
+    bool m_single_shot { false };
+    bool m_interval_dirty { false };
+    int m_interval { 0 };
+};
+
+}