Move Widget & friends into LibGUI.

LibGUI/Object.cpp

@@ -0,0 +1,76 @@
+#include "Object.h"
+#include "Event.h"
+#include "EventLoop.h"
+#include <AK/Assertions.h>
+
+Object::Object(Object* parent)
+    : m_parent(parent)
+{
+    if (m_parent)
+        m_parent->addChild(*this);
+}
+
+Object::~Object()
+{
+    if (m_parent)
+        m_parent->removeChild(*this);
+    auto childrenToDelete = move(m_children);
+    for (auto* child : childrenToDelete)
+        delete child;
+}
+
+void Object::event(Event& event)
+{
+    switch (event.type()) {
+    case Event::Timer:
+        return timerEvent(static_cast<TimerEvent&>(event));
+    case Event::DeferredDestroy:
+        delete this;
+        break;
+    case Event::Invalid:
+        ASSERT_NOT_REACHED();
+        break;
+    default:
+        break;
+    }
+}
+
+void Object::addChild(Object& object)
+{
+    m_children.append(&object);
+}
+
+void Object::removeChild(Object& object)
+{
+    for (unsigned i = 0; i < m_children.size(); ++i) {
+        if (m_children[i] == &object) {
+            m_children.remove(i);
+            return;
+        }
+    }
+}
+
+void Object::timerEvent(TimerEvent&)
+{
+}
+
+void Object::startTimer(int ms)
+{
+    if (m_timerID) {
+        dbgprintf("Object{%p} already has a timer!\n", this);
+        ASSERT_NOT_REACHED();
+    }
+}
+
+void Object::stopTimer()
+{
+    if (!m_timerID)
+        return;
+    m_timerID = 0;
+}
+
+void Object::deleteLater()
+{
+    EventLoop::main().postEvent(this, make<DeferredDestroyEvent>());
+}
+